Stress-Strain Relationship of Ca(OH)_𝟐-Activated Hwangtoh Concrete

Table 2

Details of Ca(OH)₂-activated Hwangtoh concrete mix proportions and summary of test results.

Group	Specimen*	𝑊/𝐵 (%)	𝑆/𝑎 (%)	𝑉agg (%)	Unit weight (kg/m^3)					𝑤𝑐 (kg/m^3)	𝑓^′𝑐 (MPa)	𝐸𝑐 (MPa)	𝜀0	𝜀0.5
					𝑊	𝐵	𝑆	𝐺	𝑆𝑝
I	25–100	25	100	0.0	180	720	1469	0	10.8	2419	30.8	17468	0.0033	0.0038
	25–75		75	14.3			1102	372		2424	33.1	18563	0.0031	0.0042
	25–60		60	22.9			882	595		2426	35.0	19873	0.0032	0.0048
	25–45		45	31.4			661	818		2429	35.0	22040	0.0028	0.0054
	25–30		30	40.0			441	1041		2431	36.9	23607	0.0028	0.0062
II	40–100	40	100	0.0	180	450	1709	0	5.4	2321	12.2	10241	0.0026	0.0052
	40–75		75	16.6			1281	432		2326	15.7	13822	0.0025	0.0050
	40–60		60	26.6			1025	691		2329	16.6	15737	0.0023	0.0056
	40–45		45	36.6			769	951		2332	17.5	16382	0.0023	0.0061
	40–30		30	46.5			513	1210		2335	19.5	17043	0.0024	0.0066

𝑊/𝐵: water-to-binder ratio by weight, 𝑆/𝑎: fine aggregate-to-total aggregate ratio by volume, 𝑉_agg: volumetric ratio of coarse aggregate, 𝑊: water, 𝐵: binder, 𝑆: fine aggregate, 𝐺: coarse aggregate, 𝑆_𝑝: polycarboxylate-based, high-range water-reducing admixture, 𝑤_𝑐: dry density of concrete, 𝑓^′_𝑐: compressive strength, 𝐸_𝑐: modulus of elasticity, 𝜀₀: strain at peak stress, and 𝜀_0.5: strain corresponding to 0.5𝑓^′_𝑐 after the peak stress.
∗In specimen names, the first and second parts refer to the 𝑊/𝐵 ratio and 𝑆/𝑎 ratio, respectively, for example, 25–75 refers to Ca(OH)₂-activated Hwangtoh concrete mix with 𝑊/𝐵 and 𝑆/𝑎 ratios of 25% and 75%, respectively.