Foam Concrete: A State-of-the-Art and State-of-the-Practice Review

Table 4

Prediction models for compressive strength of FC.

No.	Components	Equations	Annotations	Reference
1	OPC and limestone powder		γ = dry density (kg/m^3)	[5]
2	OPC, fine sand and FA		A, B and C = parameter reflecting compressive strength, hydration rate and porosity of mix, t = curing time, Sa = empirical constant, mc, mm and ms = cement, admixture, fine aggregate dosages per cubic meter	[127]
3	Cement, FA and slag		a, b = empirical constants, A, B = fitting constants, p1, p2 = porosity.	[128]
4	Cement, FA and slag		c, d = empirical constants, C, D = fitting constants	[128]
5	OPC and FA		γ = dry density (kg/m^3)	[12]
6	Cement and sand		c = cement content,  = cm = water to cementitious material ratio, s/c = sand-to-cement ratio	[126]
7	Cement, sand and FA		b = empirical constant,  = filler-cement ratio by weight,  = filler-cement ratio by volume, f = theoretical strength of a paste with zero porosity, ks = water-solids ratio by weight,  = unit weight of water, dc = fresh density, ρc = specific gravity of cement	[114]
8	Cement, sand and FA		Vc = volume of cement, Vfl = fillers volume per cubic meter of concrete, α = hydration degree, K = gel intrinsic strength, n = empirical constant	[114]
9	Cement and FA		αd = dry density ratio	[129]
10	Cement and FA		p = porosity	[129]
11	Cement and ash		a/c = ash/cement ratio by weigth, l, m and n = constants	[130]
12	Cement and FA		dc = fresh density, ρc = specific gravity of cement,  = unit weight of water	[131]
13	Cement and ash		αb = binder ratio by volume, f = cement paste compressive strength	[63]
14	Cement and sand		c, , and a = absolute volumetric; Proportions of cement, water, and air, k and n = constants	[119]
15	Cement		Ks = empirical constant, pos = porosity at zero-strength	[132]
16	Cement		ρc = specific gravity of cement,  = unit weight of water, Ks = empirical constant	[133]