Generally durability of concrete is determined by curing concrete in 5% or so solutions of H2SO4 or HCl and the loss of strength and weight is determined.
I guess they only give the relative performance. Please justify the practical relevance of it?
Dear
Until now we don't have any standard for comparison of acid attack results. So I think these results usually compare with control sample and for example we have not any limitation for weight or compressive strength loss.
Dear
Until now we don't have any standard for comparison of acid attack results. So I think these results usually compare with control sample and for example we have not any limitation for weight or compressive strength loss.
Dear Ponnada, I concurr with Ali Dousti. The best way to interpret your results is comparing the loss of weight or strength of new concrete being evaluated versus control samples with normal proportions. Sometimes I use the 10% criteria of difference; it is said, if the new mixture differ in more than 10% of the control sample, it is not a good sample. Of course, this depends in the usage of this new concrete: industry, buildings, coastal structures, etc.
I understand that comparison has to be made with control specimen. I was trying to know if there are any guidelines or acceptable limits of % loss of strength or weight for its adaptability in different structures.. Even RCPT results have vague guidelines.
There are no absolute values that you can refer to defining failure due to acid or sulfate attack. The reason –in my opinion- is that the degree of lose in strength or weight will depend very much on the properties of the original concrete. I advise you read my paper “Impact of Environmental and Operating Conditions in Oil Refineries on Concrete Properties”, publish in ACI Materials Journal, V. 93, No. 4, July-August 1996. Full text is available in my profile.
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