a) What is insoluble residue (IR) of cement? b) What is its cause? c) The IR...

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Civil Engineering

a) What is insoluble residue (IR) of cement? b) What is itscause? c) The IR of portland fly ash composite cement isconsiderably higher than of ordinary portland cement produced fromthe same clinker. Why?

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Answer a Insoluble residue IR measures adulteration of cement coming from impurities in gypsum calcium sulphate and high values have been shown to reduce strength The high values of loss of ignition could be attributed to prehydration and it seems the cement had been stored for a long time b IR of cement is perhaps due to the fact that progressive addition of calcined clay in PCC40 PCC45 PCC50 resulted to increased quantity of insoluble materials The insoluble residues represents the unreactive hence did not participate in the hydration reactions as well as pozzolana reaction of the blended cement The insoluble material could have acted as a filler material in See Answer

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