I did tests on compression and split tension of concrete cured in sea water. while a reduction in comp. strength was observed, an increase in split tensile strength was observed when compared with normal water cured concrete. can any one explain.
I agree with my colleagues that mentioned that the problem is probably linked to the intrinsic variation of the tests.
However, we can not forget that the condition ofsaturation of specimens may provoke different influences on the compression and tensile testing responses. This is because the water saturating the pores of the concrete tends to reduce the maximum load achieved in the compression test and increase the maximum load measured in the tensile test. So, it is important to keep in mind that variations in concrete saturation level may influence the outcome of tests in greater intensity than the caused by actual quality of curing water.
It would be helpful to answer your question if you can mention whether specimens were wet or dry during testing because moisture state in the specimen affects different strength properties in non-identical manner.
It shouldn't has different effect since failure under compression is caused by splitting for cylindrical samples and partial splitting and shear for cubes. How much difference are you talking about? Are you sure this is not just statistical variations in the results? You may need to perform a T-Test to ensure that the results belong to two different groups.
Under seawater concrete may gain a little strength at early age due to the action of chloride. however, it will start loosing strength on prolonged exposure due to sulphate attach. Further, tensile strength reflects the strength of superficial layer concrete. But compressive strength reflects the entire mass of concrete specimen.
I agree with my colleagues. It is possible that this difference is of statistical order and is not relevant to be considered as a real added value
When the curing is given for the concrete for the process of long time heat of hydration so clean water is useful other wise, any waste water is such as waste of chemical water is affect the compressive strength of concrete and and binding of cement particles...... This answers is as per my knowledge.
Curing periods is depends upon the types of cement is used and environment conditions
In winter curing period is less compare to summer season
I agree with my colleagues that mentioned that the problem is probably linked to the intrinsic variation of the tests.
However, we can not forget that the condition ofsaturation of specimens may provoke different influences on the compression and tensile testing responses. This is because the water saturating the pores of the concrete tends to reduce the maximum load achieved in the compression test and increase the maximum load measured in the tensile test. So, it is important to keep in mind that variations in concrete saturation level may influence the outcome of tests in greater intensity than the caused by actual quality of curing water.
Immediately after addition of water, you will have free water (as capillary) for hydration which may or may not enough for complete hydration. If W/C is low (say lower than 0.36), you may need to allow curing water to enter into concrete for hydration. Use of seawater, will enhance early strength due the presence of chloride in seawater. The variation of strength may not be significant as replied by the others.
The use of seawater for curing may not have a significant effect on strength, but it may substantially affect the durability of steel reinforcement in the concrete. As the permeability of the concrete of the partially cured concrete is relatively high, the chloride ions will be able to diffuse into the young at a relatively rapid rate. Therefore, only potabl water or lime rich water should be used for curing concrete.
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