Ma'am/Sir, I'm taking up CMT and we have observed or experiment on how does concrete gain strength over time. The 1st test(7dayconcretecuring) the specimen attain 15.78MPa compressive strength but in the 2nd test(14days) it decrease to 12.34MPa. How come it decrease? And i learn that compressive strength of concrete is increasing overtime. But the opposite happened. Please help me answer this question ma'am/sir. Thank you.