Download e-book for iPad: Chemical Admixtures for Concrete, Third Edition by Noel P. Mailvaganam, M.R. Rixom
By Noel P. Mailvaganam, M.R. Rixom
Chemical admixtures are utilized in concrete combinations to supply specific engineering homes corresponding to swift hardening, water-proofing or resistance to chilly. Chemical Admixtures for Concrete surveys contemporary advancements in admixture expertise, explaining the mechanisms through which admixtures produce their results, a number of the varieties 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 around the globe. The e-book will pay specific recognition to strong perform and incorporates a targeted bankruptcy at the foreign criteria presently in strength.
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Additional info for Chemical Admixtures for Concrete, Third Edition
Fig. 27 The effect on slump of varying addition levels of water-reducing admixtures. as beneficial in allowing regain of workability by addition of further water with the minimum effect on concrete quality in terms of strength. This effect has been studied  as a means of retempering concrete mixes which have been subjected to prolonged mixing at elevated temperatures resulting in loss of slump. It was found that the amount of water required to regain the original workability was © 1999 Roger Rixom and Noel Mailvaganam Fig.
18 . These data can be used to obtain a viscosity reducing index for various materials by measuring the slope of the line. 7 Adsorption data for calcium lignosulfonate and sodium gluconate © 1999 Roger Rixom and Noel Mailvaganam Fig. 18 Reduction in cement paste viscosity by various water-reducing admixtures as a function of amount adsorbed. that this technique is only used by the author as a means of comparing series of experimental products with known standards since different values are obtained for different batches of cement.
The sulfate ion concentration normally diminishes rapidly, whereas in the presence of a water-reducing admixture, the high concentration is maintained due to the reasons given in (1) which, in turn, can be related to a delay in the reaction of the gypsum by the C3A phase to form ettringite. Indeed, if the cement constituents are given a prehydration period prior to the addition of the admixture, results intermediate between those shown in Fig. 22 are obtained because part of the C3A+CaSO4 reaction has been permitted to proceed .
Chemical Admixtures for Concrete, Third Edition by Noel P. Mailvaganam, M.R. Rixom