Structural Concrete Prepared with Coarse Recycled Concrete Aggregate: From Investigation to Design

Table 4

Compressive strengths (MPa) after 3 and 28 days.

Curing times	3 days		28 days
Mixtures	Mean values	Standard deviations	Mean values	Standard deviations
REF-I-0.40	37.0	2.4	58.6	3.4
REF-I-0.45	28.5	1.8	56.1	2.5
REF-I-0.50	28.7	2.6	51.2	3.1
REF-I-0.55	24.7	2.4	47.1	2.6
REF-I-0.60	20.1	2.8	43.9	1.3
REF-II-0.40	32.1	2.2	52.2	1.7
REF-II-0.50	19.8	2.1	43.3	2.0
REF-II-0.60	15.3	1.9	36.1	1.8
CRA-I-0.40	29.7	1.3	46.1	3.2
CRA-I-0.45	26.2	1.7	45.8	2.9
CRA-I-0.50	22.2	2.3	39.9	3.7
CRA-I-0.55	21.7	1.7	36.3	2.7
CRA-I-0.60	15.5	1.8	34.7	1.6
CRA-II-0.40	26.1	1.6	41.8	1.8
CRA-II-0.50	16.4	1.9	35.1	1.8
CRA-II-0.60	12.9	1.7	29.2	1.9