By Noel P. Mailvaganam, M.R. Rixom
Chemical admixtures are utilized in concrete combinations to supply specific engineering homes similar to quick 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 different types 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 tasks all over the world. The booklet will pay specific cognizance to sturdy perform and contains a particular bankruptcy at the overseas criteria at present in strength.
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Extra info for Chemical Admixtures for Concrete, Third Edition
1999 Roger Rixom and Noel Mailvaganam Fig. 34 Rheology of concrete containing a normal plasticizer (300 kg m-3) (Hewlett). (b) Bleeding The movement of clear water to the surface of the concrete can lead to aesthetic problems of surface finish and plastic settlement and interfere with the reinforcement-concrete bond. On the other hand, promotion of bleeding can, in certain circumstances, be beneficial; in hot and windy weather conditions, plastic cracking can occur when the rate of evaporation exceeds the bleeding rate.
In addition, it is often noted that increases in workability produced by the addition of a waterreducing admixture can be made without the loss of cohesion associated with redesigning the mix at higher water content. The quantitative data useful in this context in the published information  are the rheological characteristics of concrete containing a lignosulfonate water-reducing admixture. 34 shows the rheological results; the slope of the line is a function of the workability of the concrete, whilst the intercept on the energy input axis should be an indication of the cohesion or the inherent structure of the concrete.
19 Elastic modulus of concrete containing a lignosulfonate-based water-reducing agent as a ratio of a plain mix (Tam) In the absence of cracks and large channels in the concrete, the permeability is a function of the paste water-cement ratio. The graphs given in Fig. 38 show the logarithmic relationship between the water-cement ratio and the permeability coefficient of hardened cement paste. 4 will be almost impermeable. Waterreducing agents can be used to reduce the water-cement ratio, so ensuring that the permeability is kept to a minimum.