Performance of Concrete Developed by Enhanced Gradation of Natural Fine River Sands by Partial Replacement of Waste Quarry Dust

Table 5

Compressive strength and modulus of rupture results.

Target strength (MPa)	Mix	Compressive strength (MPa)				Modulus of rupture (MPa)
		1	2	Avg	SD	1	2	3	Avg	SD
21	Control	23.9	25.0	24.5	0.778	3.60	4.05	3.60	3.75	0.260
	NRS-NC	26.1	26.1	26.1	0.000	4.05	4.30	4.50	4.30	0.225
	RS	20.5	21.6	21.1	0.778	3.15	3.60	3.60	3.45	0.260
28	Control	30.5	31.1	30.8	0.424	4.95	5.15	—	5.05	0.141
	NRS-NC	33.3	34.4	33.9	0.354	5.15	5.85	5.65	5.55	0.361
	RS-NC	39.4	37.7	38.6	1.202	6.10	5.85	6.10	6.00	0.144
	RS	31.1	31.6	31.4	0.354	4.30	4.30	5.15	4.60	0.491
	NCS-NC	35.5	35.0	35.3	0.354	5.85	6.10	5.65	5.85	0.225
	CS-NC	38.9	38.3	38.6	0.424	5.85	6.10	6.30	6.10	0.225
	CS	31.6	32.7	32.2	0.778	4.05	5.40	4.95	4.80	0.687
35	Control	35.0	32.7	33.9	1.626	4.50	5.15	5.15	4.95	0.375
	NRS-NC	36.1	37.2	36.7	0.778	5.40	5.85	5.40	5.55	0.260
	RS	29.4	30.0	29.7	0.424	5.40	4.05	—	4.70	0.955