Sampling career	Naming of samples	Concrete resistance (MPa) according to its age (in days)			Expected resistance rate at 28 days achieved
Sampling career	Naming of samples	7 days	14 days	28 days	Expected resistance rate at 28 days achieved
Bandjoun-Djione	B1	9.39	12.39	13.14	52.56
Bandjoun-Djione	B2	10.89	13.14	14.14	56.56
Djengou	D1	13.00	14.00	16.00	64
Djengou	D2	11.74	13.08	15.06	60.24
Hiala	H1	10.00	11.50	17.50	70
Hiala	H2	12.00	13.42	16.04	64.16
La’gou	L1	10.00	13.00	16.50	66
La’gou	L2	14.80	18.53	24.64	98.56