Download Chemical Admixtures for Concrete, Third Edition by Noel P. Mailvaganam, M.R. Rixom PDF

By Noel P. Mailvaganam, M.R. Rixom

Chemical admixtures are utilized in concrete combos to supply specific engineering homes akin to speedy hardening, water-proofing or resistance to chilly. Chemical Admixtures for Concrete surveys contemporary advancements in admixture know-how, explaining the mechanisms during which admixtures produce their results, some of the sorts of admixtures on hand, their choice and use.
Because of the economies they could provide, admixtures are getting used more and more in civil engineering initiatives world wide. The booklet will pay specific recognition to stable perform and features a certain bankruptcy at the overseas criteria at the moment in strength.

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Extra resources for Chemical Admixtures for Concrete, Third Edition

Example text

B) If strength is the major consideration, the paste volume should be balanced by an increase in the coarse aggregate content. (c) Most usually the paste volume is replaced by an increase in the total aggregate without a change in the coarse to fine proportioning. This technique has been used in many hundreds of applications, and only occasionally has it been found necessary to revert to (a) or (b). It was shown earlier that aggregate types do not materially affect the performance of water-reducing admixtures.

Some results have been obtained for sodium gluconate [55] at least up to the end of the second peak. It seems, therefore, that the C2S and C3S phases are retarded and that the presence of a waterreducing admixture interferes with the ettringite reaction, particularly in the conversion of the ettringite to the monosulfate. The point in (1) is borne out by the analysis of mixtures of C3A and water at various times in the presence or absence of gypsum and calcium lignosulfonate (CLS). 10 illustrates the results obtained [56].

17 Effect of water-reducing admixtures on bleeding rates and capacities 3. 4. Economies in mix design are effected by reducing the cement content whilst maintaining the same water-cement ratio. In view of the reduction of paste volume, conflicting recommendation are made of how this should be compensated for. The following is a guide [84]: (a) If the mix appears to be ‘sticky’, the paste volume being removed should be balanced by an increase in the sand content. (b) If strength is the major consideration, the paste volume should be balanced by an increase in the coarse aggregate content.

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