Study on Antiweathering Support Technology of Thin Spray-On Liners in Shallowly Buried Coal Seam Roadway under Corrosion Condition

Table 1

Comparison of economic and social benefits of sprayed concrete and the use of thin spray-on liners.

Object name	Concrete spray layer	Thin spray-on liners
Construction speed	Four person/class 6 m	Three person/class 60 m
Working environment	Dust concentration up to 100 mg/m^3 and poor construction site environment	Dustless and good working environment
Thickness of lining layer	50 m	2∼5 mm
Labor intensity	High labor intensity (cement, sand transportation, and manual handling materials)	Low labor intensity (stirring directly in mixing drum)
Material particles bouncing back	Large springback, more than 30%	Almost no rebound
Cost per square (including labor costs)	150 yuan	90 yuan
Technical feature	Easy to crack, peel off, and peel off	High viscosity, strong adhesion, good toughness, and compactness
Construction technics	Complication	Easy
Consumption per square	163 kg	5.5 kg