What is the possible reason for increase in compressive stregth of concrete upto 14 days and decrease subsequently when it is cured in sea water?
check the following papers:
https://www.researchgate.net/publication/235095215_Effects_of_Sea_Water_on_Concrete
good luck
Article Effects of Sea Water on Concrete
You need to give more information like what type of cement did you use and what was water to cement ratio?
Hi Radwa, according to the description you've provided, it seems that the tested concrete specimens were unreinforced samples, which were prepared in a laboratory and were cured by sea water.
The reason for the increase in strength in the first 14 days is hydration of cement. It is normal for a concrete sample to gain strength over the time.
The most probable reason for the decrease in compressive strength in later ages such as 28 or 56 days should be the formation of salt crystals in concrete with high porosity and to a lesser extent the sulfate attack due to the curing in sea water.
Using SCMs such as silica fume (8%) in combination with slags (50%), low water-cement ratio (0.35 or less), and cement content (450 kg/m3 or more) should significantly improve the long-term strength gain of the concrete specimens cured in sea water.
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