Hi everyone and senior researchers,

I am currently on experimenting the shrinkage of SCM (Supplementary Cementitious Materials) Infused concrete.

I made 6 specimens with same specimen size in 1 mixing to make sure that the specimen have similar mechanical properties.

After mixing, i let them hardened in the mold for a day

And the next day, demoulded and started measuring the initial shrinkage of specimens

Then, after measuring, 3 of the specimens were put into room with higher temperature and another 3 into the room with standard condition 25 degree C.

Then keep measuring.

However, as the day increases, the shrinkage rate of the specimens in higher degree temperature room show higher than that of specimen in standard condition, until the shrinkage rate starts stablizing and both the shrinkage from two different rooms meet at some point around 60 days.

So while doing this calculation, i had also considered the effect of the coefficient of thermal expansion of concrete and subtracted that expansion due to the thermal expansion.

So What i am wondering is although I had same mix design in one batching with same properties just with different temperature, which i had make up for by adding the thermal expansion of concrete, why is the two shrinkage rate still difference . What parameters am i missing while considering ? Please kindly answer my questions if anyone thinks i am missing something

Thanks in advance