By Zongjin Li

ISBN-10: 047043743X

ISBN-13: 9780470437438

During the last twenty years concrete has loved a renewed point of study and trying out, leading to the improvement of many new varieties of concrete. by utilizing numerous ingredients, construction strategies and chemical methods, there's now an excellent measure of regulate over the houses of particular concretes for a variety of purposes. New theories, types and checking out recommendations have additionally been constructed to push the envelope of concrete as a development fabric. there is not any present textbook which brings all of those developments jointly in one quantity. This publication goals to bridge the space among the normal concrete applied sciences and the rising cutting-edge applied sciences that are gaining wider use.

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1 Effects of aggregates (a) Aggregate in fresh and plastic concrete: When concrete is freshly mixed, the aggregates are suspended in the cement–water–air bubble paste. The behavior of fresh concrete, such as fluidity, cohesiveness, and rheological behavior, is largely influenced by the amount, type, surface texture, and size gradation of the aggregate. , what type of structure to be built. (b) Aggregate in hardened concrete: Although there is little chemical reaction between the aggregate and cement paste, the aggregate contributes many qualities to the hardened concrete.

CH is formed in solution by crystallization and occupies about 25% of the structural component of cement paste. CH can bring the pH value to over 12 and it is good for corrosion protection of steel. 2 Cementitious Binders 39 leaching due to its solubility, carbonation due its reaction with carbon dioxide, alkali aggregate reaction due to its high pH value, or sulfate attack due to its reaction with sulfate. Hence, in contemporary concrete technology, there has been a trend to reduce amount of CH in concrete as much as possible.

D) Sand/coarse aggregate ratio: The fine/coarse aggregate ratio will influence the packing of concrete. It also influences the workability of concrete in the fresh stage. Increase of the sand to coarse aggregate ratio can lead to an increase of cohesiveness, but reduces the consistency. Of all the measures for improving the cohesiveness of concrete, increasing the sand/coarse aggregate ratio has been proven to be the most effective one. (e) Aggregate/cement ratio: The aggregate/cement ratio has an effect on the concrete cost, workability, mechanical properties, and volume stability.

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