Nanoprocessing of Industrial Rejects for Controlling Operational Energy of Buildings

Tembhurkar, Sandeep; Nayar, Priyanka; Azad, Naumanuddin; Ralegaonkar, Rahul; Madurwar, Mangesh

doi:https://doi.org/10.1155/2022/2969266

Advances in Civil Engineering

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Abstract Introduction Materials and Methods Results and Discussion Conclusions Abbreviations Data Availability Additional Points Disclosure Conflicts of Interest Acknowledgments References Copyright Related Articles

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Application of Tools and Techniques for Carbon Minus Building Construction

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Research Article | Open Access

Volume 2022 | Article ID 2969266 | https://doi.org/10.1155/2022/2969266

Nanoprocessing of Industrial Rejects for Controlling Operational Energy of Buildings

Sandeep Tembhurkar,¹Priyanka Nayar,²Naumanuddin Azad,²Rahul Ralegaonkar,¹and Mangesh Madurwar¹

Academic Editor: Adolfo Preciado

Received16 Mar 2022

Revised03 May 2022

Accepted09 May 2022

Published21 Jun 2022

Abstract

This study investigates the pozzolanic potential of industrial waste, which fails to meet the chemical composition as defined by the various international standards, e.g., IS: 3812 (Part 1): 2017 and ASTM C618-19 to adopt as a supplementary cementitious material. The effects of mechanical nanoprocessing on pozzolanic reaction efficiency, impact on energy efficiency, and construction affordability were studied. The result of mechanical milling shows the improvement in pozzolanicity, and the physicomechanical characteristics of novel concrete incorporated with identified industrial waste are comparable with control concrete. The building energy simulation was carried out using the BIM software for the house, modelled with controlled concrete, and novel concrete incorporating the identified milled industrial waste. The peak cooling load and building material cost of a novel concrete model house were 34% and 9.09% less than the conventional concrete. The study reveals that the chemical characterization provided in international standards shall not be the only criteria to decide the suitability of the materials to use as supplementary cementitious material, whereas the same can be examined and improved through various treatments, and mechanical nanoprocessing may be one of the best options. Cement production and utilization affect the environment. To reduce the concern, pozzolanic investigation of industrial waste is necessary, which can address the issue of uncontrolled extraction of natural resources, emission, disposal, and pollution globally.

1. Introduction

Industrialization in developing countries has resulted in the consequent accumulation of unmanageable industrial wastes and greenhouse gases (GHGs). Asia produces 4.4 billion tons of solid waste every year [1]. As per the United Nations Environment Programme (UNEP) report, 86 billion tons of carbon dioxide are emitted by global buildings annually [2]. Presently, India alone generates about 290 million tons (MT) of inorganic wastes [3] and 76.4 MT of CO₂ [4] per year from various cement manufacturing industries. Normally, 0.9 ton and 0.1 ton of CO₂ are released into the environment during the manufacturing of 1 ton of cement and 1 ton of concrete, respectively [5, 6]. Cement production (∼550 MT by 2020-21) [7]and consumption in India have increased multifold in the last few decades [8]. The exponential production and consumption of cement and cement products creating a huge environmental burden with the exploitation of natural resources are becoming a global issue [9]. The application of limestone during the clinkering process results in a significant amount of emissions (5-6% of total greenhouse gas emissions) [10–12] by consuming a huge amount of nonrenewable resources [7, 13]. Around 350 to 540 kg of raw slag is generated, from the per ton production of liquid iron and steel [14, 15], and around 24 MT of slag is generated every year in India [16]. The state-wise annual production of steel and iron slag in India is shown in Figure 1.

In the twenty-first century, nanotechnology was a highly adopted technology for research and development in construction worldwide [19]. The nanoparticles/nanocomposites have attracted considerable attention as structural materials, because of their low density, high specific modulus, strength, and resistance to wear and corrosion [20]. However, the application of nanotechnology in the development of alternate construction materials needs to be studied in detail. Similarly, energy analysis and cost-effectiveness are also required to be studied for the building energy simulation of alternate nanomaterials [21]. Building information modelling (BIM) is an effective simulation tool that can undertake these parameters [22]. BIM enables the user to create a virtual model to simulate the planning, design, construction, and operational facility in the building [23]. BIM results are object-oriented, intelligent, and provide the digital data of building facilities, generating information on thermal and functional performance, which help to improve the decision and process of establishing the facilities [24, 25]. BIM regulates the life cycle cost, design, construction, and operational cost of a project [15–17].

Many researchers investigated the thermal performance and embodied energy of building components using the BIM software tool (Revit 2019). The thermal performance of various construction materials developed incorporating industrial wastes was investigated by various researchers using Revit 2019 and is tabulated in Table 1.

Now, there is a need of an hour to find sustainable alternatives to primary binding material (cement) from the enormous available industrial rejects. However, such studies have limitations on the obtained oxide compositions, the particle size of waste material, and their suitability as SCM in accordance with BIS 3812 (Part 1): 2017 [32]. The pozzolanic material not only helps to decrease the burden on natural resources but also encourages to decrease the carbon emission of cement and concrete production. The pozzolanic efficiency of unsuitable industrial waste (as per IS 3812 (Part 1): 2017) was examined after nanoprocessing, i.e., mechanical milling from high-energy ball mill. Introducing the nanotechnology for material milling was found to be an effective treatment to make industrial waste suitable to use as a SCM. In addition to that, the energy efficiency and cost of effectiveness of prototype model were analysed using BIM tool.

2. Materials and Methods

The investigation process is depicted in Figure 2, which explains the step-by-step methodology used in this study. An industrial waste was identified, which was easily available in and around the study area. Further, the properties of raw materials were identified using the physicochemical and physicomechanical tests and the suitability was checked to use a SCM/pozzolana. If the material fails to meet the criteria to use as a pozzolana, then it must be suitably treated with the best economical option. In this study, mechanical milling treatment was adopted where the material was ground to nanoscale. Subsequently, the properties of milled samples were again tested for pozzolanic efficiency. The treated material with improved pozzolanic efficiency was used for the product development, and later, the performance and affordability of building developed with various building applications incorporating the treated milled material were analysed using BIM tool.

2.1. Materials Used

Granulated blast furnace slag (GBFS), an industrial waste, was considered as the principal raw material for the study, which was collected from the iron and steel industry available in and around the research area (Nagpur, Maharashtra, India). OPC 53 grade cement conforming to IS: 12269-2013 [33] was used as a primary binder for laboratory trials. Locally available river sand and crushed stone conforming to IS: 383–2002 [34] were used as fine and coarse aggregates. To perform pozzolanicity tests, necessary chemicals such as saturated calcium hydroxide (Ca(OH)₂) solution, calcium oxide (CaO), distilled water, phenolphthalein indicator, the concentrated and 0.1 N hydrochloric acids (HCl), concentrated nitric acid (HNO₃), concentrated sulfuric acid (H₂SO₄), hydrofluoric acid (HF), and Whatman filter paper no. 40 were used.

2.2. Methodology Adopted

To pulverize the principal raw material to the nanoscale, a high-energy planetary ball mill (Fritsch Pulverisette P5) was used. Milling was optimized using differential time duration of 10, 30, and 90 minutes, i.e., GBFS 10, GBFS 30, and GBFS 90. Figure 3 represents the proposed raw materials, i.e., GBFS, before and after milling. The physical characterization of the material was carried out as per IS 1727-2004 [35]. The physical properties such as specific gravity, bulk density, and setting time of GBFS were tested as per the relevant Indian standards. The nanostructure analysis of identified material was evaluated by particle size distribution (PSD) [36, 37], scanning electron microscopy (SEM) [38, 39], X-ray diffraction (XRD) [40, 41], and X-ray fluorescence (XRF). Grading of mechanically treated ultrafine ground fraction raw materials (granulometric analysis) was performed using a laser particle size analyser [42]. The liquid media was used to conduct the analysis [43]. The ultrasonic frequency was 80 Hz, and the pump speed was 600 rpm. After 10–12 minutes, particle size was assessed. Surface morphology and particle size resemblance of the samples were inspected using the Scanning Electron Micro-Probe Analyzer-JEOL, JAPAN JXA-840. The chemical oxide compositions and loss of ignition (LOI) were evaluated using PANalytical “PW2403 MagiX” XRF technique. Xpert-PRO X-ray diffractometer system was used to analyse the mineral phases of raw and milled material.

(a)

(b)

Pozzolanicity of principal raw material before and after milling was carried out using various pozzolanicity methods: (i) pozzolanic activity index [44–47], (ii) electrical conductivity [48–50], and (iii) Chapelle activity [44, 51–54]. Pozzolanic activity index (PAI) was evaluated as per the procedure provided in IS 2250:1981. The sample blocks were prepared by replacing 35% (by volume) of OPC with the selected industrial rejects, i.e., GBFS. Pozzolana activity index was calculated in percentage ratio of 28 days of compressive strength of GBFS to the compressive strength of control mortar block [45, 46, 55].

An electrical conductivity test is conducted to study the pozzolanicity of supplementary cementitious materials (SCMs). The sample was prepared using the identified material and calcium hydroxide solution. The water and sample solution was used to find the conductivity of ions present in the material [55, 56]. The Chapelle activity test was performed to determine the fixed CaOH by taking the solution of grounded material in water with CaO and titrating the same with HCL and using phenolphthalein solution as an indicator [54, 55, 57].where is the volume of HCL consumed for titrating solution without pozzolana. is the volume of HCL consumed for titrating solution containing pozzolana. The suitable building application was developed as an end product using milled GBFS samples and compared over the conventional building application of the same grade for energy efficiency using the BIM simulation tool.

3. Model Development

After the micro-analysis of identified material, the pozzolanic performance of mechanically milled material was evaluated to check the sustainability of materials and treatment process. On suitability of materials, a novel construction concrete building application was cast incorporating the mechanically milled (treated) industrial waste, and later, a model house was simulated in BIM software for conventional and novel concrete elements to study the energy efficiency and affordability.

BIM tool is used for 3D design and modelling, which helps in forecasting the building design, assembly of elements, and work progress [40, 41]. A single-storey residential building was selected for BIM model. The project was situated in Indore, Madhya Pradesh, under the lightweight housing scheme of Global Housing Technology Challenge (GHTC), Government of India. The project aims to provide a sustainable technology solution for faster and cost-effective construction suitable for the geo-climatic zones and hazardous conditions.

Figure 4 shows the 2D plan of building, and Autodesk AutoCAD 2019 version was used to draw the plan. The plan of a single dwelling unit has an area of 29.92 m². The carpet area was also approved by the GHTC, India [58]. The prototype model of the same project was analysed for the study area, Nagpur, Maharashtra, India (latitude 21.1311⁰N and longitude 79.0511⁰E). The residential building mainly consists of three rooms, i.e., living room, a bedroom, and a kitchen with a small passage and toilet. Clear 3 m height of the unit was considered. The thickness of the exterior and internal walls was considered 150 mm and 100 mm, respectively. Three windows, W1, W2, and W3 of sizes 1.5 m × 1.2 m, 1m × 1.2 m, and 0.8 m × 1.2 m, respectively, were provided. The doors D1, D2, D3, and D3A of size 1.2 m × 2.1 m, 1m × 2.1 m, 0.75 m × 2.1 m, and 0.9 m × 2.1 m, respectively, were provided in the building. For the base case, the model developed with elements of conventional concrete was considered, whereas the alternate model developed with building application of the same grade incorporating milled GBFS was considered for comparative analysis. The peak cooling load demand was calculated for both the models. The temperature range of 18–28°C for the climate zone of Nagpur (21.1311°N-79.0511°E) was set as per the SP 41 (BIS-1987) [59]. Each room of the building was analysed for the design cooling load using the building information modelling tool (BIM) that is the Revit Architecture 2019 Student Version [60]. Two separate models were simulated for analysis where the walls, floor, and slab of the building were considered with the properties of respective materials.

4. Results and Discussion

The results of the tests performed on as-received and mechanical-processed industrial waste are discussed as follows.

4.1. Physical Properties

The results of the physical characterization are shown in Table 2. From the test results, it was observed that the specific gravity of industrial waste before and after milling remains unchanged and was found lower than the specific gravity of cement; hence, it was expected that the building material incorporating these wastes will be lighter in weight. The density of material was determined before and after milling; there was no discernible difference observed in the density of GBFS after milling. The initial setting time of the proposed industrial waste was higher than the cement, whereas the final setting time is lower than the cement, which is further diminished significantly on milling. The surface area of industrial waste increases exponentially on milling. The negligible evidence of soundness and shrinkage percentage was noticed before and after milling; hence, it can be recommended for suitable building applications. Milled GBFS showed considerable improvement in lime reactivity.

In Table 3, characteristics of before (0 min) and after milled (90 min) GBFS are displayed according to the criteria mentioned in Table 2 of BIS 3812 (Part 1): 2017. The comparative study was carried out on basis of fineness: wet sieving, lime reactivity strength, 28 days of compressive strength, and soundness of material. 126% improvement in fineness was noticed after milling the sample than that of the before milled sample and meeting the requirement of BIS. Particles retained on 45 micron IS sieve using the wet sieving method before and after milling show the result of 24% and 100%, respectively, whereas the minimum requirement is 34%. The improvement in fineness must be the result of the mechanical nanoprocessing. The lime reactivity of milled samples improves significantly after mechanical milling and achieved 85% more strength than the BIS, i.e., IS 3812 (Part 1): 2017. The compressive strength of milled samples was increased by more than 100%. The observed improvement is due to the particle packing and well compaction of nanoparticles. Negligible soundness was observed before and after milling, which shows the suitability to mix the material in principle binding material cement for various building applications/products.

4.2. X-Ray Fluorescence (XRF)

Table 4 shows the chemical composition of the proposed industrial waste. It was observed that the milling treatment had no discernible influence on the chemical compositions and LOI values of the materials.

The amorphous (% reactive) silica plays a major role in the pozzolanic activity of the materials as per the provisions prescribed by BIS 3812 (Part 1): 2017. From the obtained results of XRF, it was observed that the industrial waste, i.e., GBFS, fails to meet the criteria mentioned in Table 1, BIS 3812 (Part 1): 2017, and hence, it is not suitable for the use as supplementary cementitious material even though the LOI is within the acceptable range as prescribed by the same BIS. The criteria given in BIS for the combined percentage of Al, Si, and Fe were also not satisfied by the GBFS milled sample.

4.3. X-Ray Diffraction (XRD)

Figure 5 shows X-ray diffraction analysis of as-received and milled samples of GBFS. The graph was plotted diffraction angle (2θ) versus intensity count, where the diffraction angle was stated from 10-degree angle and raised up to 70° on x-axis. The intensity of peaks for as-received sample and optimized milled sample (90 min grinding duration) was started from 140 counts and 150 counts, respectively, and this shows that the GBFS absorbed the energy on milling. Graphs A and B show the XRD phase of as-received and milled GBFS. The flattered hump between 20° and 35° diffraction angle and intensity depicts the amorphous phase of an as-received and milled sample of GBFS. There is no significant change observed in the XRD phase before and after milling of GBFS. Hence, as-received and milled GBFS was expected to participate in hydration reaction due to the presence of amorphous silica.

(a)

(b)

4.4. Scanning Electron Microscopy (SEM)

Figure 6 shows the surface morphology and particle size resemblance measured by scanning electron microscopy (SEM). The image shows the particle agglomeration after the high-energy milling process, even after individual particle size reached the nanoscale range. The particle size increased due to the agglomeration was highlighted in yellow circle, which shows the deposition of more than one particle. This agglomeration temporary occurs because of the van der Waals force of attraction, in which particle is obtained after high-energy milling. Therefore, the values after final milling, i.e., 30 min and 90 min of material, show the enlargement in size of particles. GBFS was milled for 90 minutes and resulted in particles of sizes ranging from 50 to 600 nm, respectively.

4.5. Laser Particle Size Analysis

Figure 7 represents the laser particle size distribution of proposed industrial rejects. The size of particle scales on D₁₀ (10% particles passing), D₅₀ (average passing), and D₉₀ (90% particles passing) is depicted in Table 5, respectively. The as-received sample was milled for 10, 30, and 90 minutes in a high-energy planetary mill to bring it to nanolevel. Insignificant variation in the particle size was observed after milling for 10 to 30 min of duration. The average particle size of as-received sample was observed to be 331 nm on 10 min of milling and the sample size was observed to be 344 nm, whereas on 30 min of milling the sample size was observed to be 328 nm; this may be due to the surface charge increments in particles. After that, a large reduction in the particle size was observed for a milling duration of 90 min. The D₅₀ of agglomerated GBFS (i.e., GBFS-WM) shifted to 384 nm from 331 nm on 90 min of milling. It was observed that the enlarged surface area after milling is due to van der Waals force of attraction or surface charge, in which particles acquire after milling. Therefore, the values of the final grinding, i.e., 90 min of GBFS, show the increment in size of particle, which is reflected in Table 5.

4.6. Pozzolanic Activity Tests

From the proposed industrial waste, the results obtained for GBFS are contradictory. As per the requirement of BIS 3812 (Part 1): 2017, the material may not be suitable to be used as SCM, whereas the XRD pattern and lime reactivity of the sample emphasize the industrial wastes to be considered as SCM. The pozzolanicity tests were performed before and after milled material to study the effect of mechanical processing on pozzolanic properties.

4.6.1. Pozzolanic Activity Index (PAI)—Strength Determination

The observed compressive strength and the trends of compositions established with the effect of milling are shown in Table 6 and regression patterns as shown in Figure 8. The graph was plotted for milling duration (in minutes) versus pozzolana activity index of GBFS (in %). The significant improvement was observed in PAI results of after milled samples as compared to as-received sample. The trend of the linear line shows the high regression value, i.e., 0.92. It can be explained as an effect of mechanical supplementary fillers; as the fineness increases, the surface area of the matrix also increases, thereby enhancing the formation of intermolecular compounds. Nanoprocessed amorphous silica further leads to the formation of secondary C-S-H compounds. The PAI method was adopted as specified in Brazilian standard NBR 12653:1990 for the pozzolanic material testing. The R² values obtained from the regression (Figure 8) show the significant improvement in the pozzolanic rate of reaction in GBFS on milling.

4.6.2. Electrical Conductivity Test (ECT)

To evaluate and ensure the material’s pozzolanic reactivity, an electrical conductivity test was also performed. The electrical conductivity of saturated Ca(OH)₂ at 40 ± 1° temperature was 7.98 mS/cm noticed. The concentration of calcium and hydroxyl ion reduces with time, which could be noticed from the decrement in conductivity values of GBFS solution. The results reveal the reaction between the silica present in GBFS and the Ca(OH)₂ standard solution, which formed the C-S-H gel. The R² value obtained from the regression (Figure 9) for GBFS was 0.96, which shows the significant improvement in pozzolanic rate of reaction due to mechanical milling.

4.6.3. Chapelle Activity Test

Chapelle activity is carried out to evaluate the consumed Ca(OH)₂ in the pozzolanic reaction. Pozzolanic material is added to the hydrated cement paste, so that silica reacts with the Ca(OH)₂ to produce secondary C-S-H gel [43]. The larger surface area of pozzolanic material increases the rate of pozzolanic reaction, and the amount of reaction produces secondary C-S-H gel.

Figure 10 shows the trend of the Chapelle activity for GBFS. A significant increase in the consumed Ca(OH)₂ was observed due to the milling treatment for all the samples. The best results were fitted in the linear mathematical model. The R² value obtained for GBFS is 0.983. The observed regression model was significant and effective, as the R² value was close to 1, whereas, from Table 6, it was observed that the Chapelle activity of GBFS was better than the standard values. Chapelle activity values should be greater than 660 mg Ca(OH)₂ per gram of sample as recommended in NF P18-513.

5. Performance and Affordability Evaluation

A comparative study carried out by Azhar et al. [24] for analysis of building performance revealed that the virtual environment is the most powerful and versatile software tool followed by Ecotect and Green Building Studios. Shoubi et al. [60] used Revit Architecture and Ecotech for energy analysis of building having an area of 400 m² two-storey unit where the composite material was proposed for saving operations energy of buildings. Gavali et al. [28, 29, 61] simulated a single-storey load-bearing model in Nagpur, India. The products were developed incorporating the co-fired blended ash (CBA) and fly ash bricks. The analysis was carried out using Revit Architecture BIM tool. The analysis concluded that deploying CBA bricks in construction would potentially lower the cost and energy of the building in comparison with fly ash brick. The above discussion emphasized and justified the use of the BIM tool for assessing the thermal performance, energy analysis, and affordability of buildings [64]. Hence, the Revit Architecture 2019 (Student Version) simulation tool was used for energy analysis and affordability study.

Models were simulated for a design mix of M30 grade concrete. The base model was considered with conventional concrete using OPC 53, and the alternate model was with replacing the 30% of OPC by milled GBFS industrial waste. The model is shown in Figure 11. The concrete made up of industrial waste was tested for physicomechanical properties after 28 days of wet curing. The physicomechanical properties show the desirable results over the conventional concrete. The density of concrete made from GBFS was noticed as 0.8% lower than control concrete, and this shall be due to the decreased specific gravity of GBFS (10%) when compared with OPC. To evaluate the energy analysis of the models, the thermal conductivity of GBFS concrete was examined as per the IS 9489:2017 [62]. The thermal conductivity of GBFS concrete is observed 34.3% lower than control concrete of the same grade.

For building simulation, the product properties need to be incorporated into the BIM software such as thermal conductivity and density. The simulation resulted in space heating and cooling load inside the dwelling unit, where the peak cooling load was estimated for the individual model. All elements of the dwelling unit were considered with the same material properties for slab, floor, and walls. The peak cooling load of GBFS model was found 34% lower than the base model cast with control concrete. The significant change was noticed in the results of the functional analysis of GBFS over control concrete. Also, a noticeable variation was observed in the affordability analysis. BIM software revealed that the total concrete volume for the single-family unit is 11.42 m³. The cost of concrete ingredients was based on current and prevailing market rates near the research area. The energy cost of mechanical milling was considered in case of concrete applications incorporating industrial waste. The mechanical milling of industrial waste requires an energy of 0.0043 MJ/kg. The cost of transportation, labour, and equipment in both the cases are location-specific and equivalent hence not considered for cost analysis. The BIM models show that the cost of GBFS concrete is 9.09% lower than the cost of control concrete. Table 7 shows the comparative study of material along with thermal properties.

6. Conclusions

The aim of this work was to compare the operational energy of a building developed with novel materials incorporating nanoprocessed industrial waste, which was unsuitable to use as SCM over the conventional material. In the first part of this study, the pozzolanic performance is evaluated of nanoprocessed industrial waste where the appropriate direct and indirect pozzolanicity tests are used. The results obtained from the tests show that the treatment has a potential to make non-SCM to active mineral admixture.

The mechanical milling of GBFS for the optimized duration of 90 minutes, respectively, reduces the particle size of GBFS up to nanolevel, which increases the surface area of the material by 226% with a subsequent increase in the pozzolanic rate of reaction. SEM showed an increase in particle size of identified industrial waste in mechanical milling due to the phenomenon of agglomeration. GBFS meets the requirements of SCM as per the IS 3812: 2013 except for silica percentage. The pozzolanic performance was evaluated from the obtained results of the pozzolanic activity index (PAI), Chapelle activity (CA), and electrical conductivity (EC). The GBFS PAI meets the strength requirements at optimized duration. The results of the Chapelle activity showed that the amount of Ca(OH)₂ consumed in milled GBFS is 224.99% as compared to as-received GBFS. The milled GBFS sample showed the better pozzolanic performance by 21% compared with the criteria mentioned in NFP 18-513.

The identified materials (GBFS) showed a significant electrical conductivity drop when tested for pozzolanicity. The electrical conductivity drops for milled GBFS increased by 10% compared with as-received sample. The linear regression models of the pozzolanic activities and milling duration were established. The R² values of PAI, CA, and EC test of GBFS have a range of 0.70–0.99 for all pozzolana tests. The ultrafine particles of GBFS significantly improve pozzolanicity. This could lead to the maximum replacement of cement in concrete production. Ultimately, it will reduce greenhouse gas emissions and will help the cement industry to become more sustainable. Furthermore, it will provide the solution to the problem of waste disposal and pollution.

In the second part, BIM tool was used to develop the simulation model and evaluate the energy performance and cost analysis of material. The BIM tool evaluated the operational peak cooling and heating load of material after simulation. The main sources of energy efficiency of building were external walls, windows, and doors, which are foist heating and cooling load on structure. BIM tool offers the opportunity to connect all particulars of building to measure operational energy consumption, cost of building components with treated material, etc. This method can be adopted for any building to calculate the load on elements of structure by selecting the alternative material, which reduced the energy consumption and environmental impact.

The critical analysis result shows the performance study of Industrial rejects GBFS consisting of low thermal conductivity as compared to control concrete. The peak cooling load of GBFS model was 34% lower than control concrete, reducing the significant energy consumption of the building. Using industrial waste, the cost of construction was reduced by 9% to conventional building cost, and it was observed that the GBFS can give a more effective solution as a sustainable and economical material. This study encourages the utilization of BIM tool to analyse the innovative materials for the energy consumption, life cycle analysis, and time cost analysis for the future studies.

The overall results reveals that the mechanical milling may not improve the chemical characteristics of material, but it can enhance the pozzolanicity and physical properties of wastes. Therefore, such milled industrial wastes can be a promising material for the concrete manufacturing after designing a mix and trials. This material can also be adopted as the alternative of cement, which can reduce the carbon footprints and energy emission and prove the affordable materials for the future construction industry.

Abbreviations

Al:	Aluminium
Al₂O₃:	Aluminium oxide
BFA:	Bio-fuel ash
BIS:	Bureau of Indian Standards
BIM:	Building information of modelling
CA:	Chapelle activity
CaOH_2:	Calcium hydroxide
CBA:	Co-fired blended ash
CO₂:	Carbon dioxide
C-S-H:	Calcium silicate hydrate
CSR:	Schedule rate
EC:	Electrical conductivity
EE:	Embodied energy
Fe:	Iron
FY:	Financial year
GBFS:	Granulated blast furnace slag
GHG:	Greenhouse gases
GHTC:	Global housing technology challenge
HF:	Hydrofluoric acid
HNO₃:	Nitric acid
H₂SO₄:	Concentrated sulfuric acid
LS:	Lime sludge
MgO:	Magnesium oxide
MTs:	Million tons
OPC:	Ordinary Portland cement
PAI:	Pozzolanic activity index
PMW:	Papermill waste
PWD:	Public Works Department
P₂O₅:	Phosphorus pentoxide
SCBA:	Sugar cane bagasse ash
SCM:	Supplementary cementitious material
SEM:	Scanning electron microscopy
SiO₂:	Silicon dioxide
SO₃:	Sulfur trioxide
TiO₂:	Titanium dioxide
UNEP:	United Nations Environment Programme
WM:	Without milled
XRD:	X-ray diffraction
XRF:	X-ray fluorescence.

Data Availability

Data statements will be made available whenever required.

Additional Points

(i) Mechanical milling was used for nanoscaling of identified industrial waste. (ii) The pozzolanic properties of industrial waste were improved through nanoscaling. (iii) The building energy simulation was studied using the BIM tool. (iv) Peak cooling load and building cost is 34% and 9.09% lower than conventional ones.

Disclosure

Statement of Novelty. In this research, an industrial waste that fails to meet the pozzolanic criteria, as per the BIS 3812 (Part 1): 2017 and ASTM C618-19, was selected. The pozzolanicity results were validated and statistically established through various available pozzolanicity test methods and microstructure analyses. Also, a holistic approach is adopted by assessing the energy and cost efficiency of modelled building unit developed by incorporating treated industrial waste over the conventional through building information modelling (BIM) tool. This shall lead to a new pathway to utilize the industrial rejects as a partial replacement of the cement in construction industry, which will reduce the carbon emission of cement industry.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Acknowledgments

The authors gratefully acknowledge the financial support of the Ministry of Mines PERC, Government of India. The authors would like to thank Visvesvaraya National Institute of Technology (VNIT) Nagpur, India; Jawaharlal Nehru Aluminium Research Development and Design Centre (JNARDDC), Nagpur; National Environmental Engineering Research Institute (NEERI), Nagpur, India; and Indian Bureau of Mines (IBM), Nagpur, India, for necessary technical and laboratory support. This project was funded by PERC: Ministry of Mines, Government of India, vide sanction number: Met4/14/2/2017-Metal IV/Record cell under the project entitled “Mechanical processing of industrial rejects to improve pozzolanic reaction efficiency.”

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