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Download Concrete Admixtures Handbook. Properties, Science, and by V.S. Ramachandran PDF

By V.S. Ramachandran

Content material:
Preface to the second one Edition

, Pages vii-viii, V.S. Ramachandran
Preface to the 1st Edition

, Pages ix-x, V.S. Ramachandran
About the Editor

, Page xi
Contributors

, Pages xiii-xiv
1 - Concrete Science

, Pages 1-66, V.S. Ramachandran, Rolf F. Feldman
2 - learn concepts, criteria and Specifications

, Pages 67-94, V.S. Ramachandran
3 - Admixture Interactions in Concrete

, Pages 95-136, V.S. Ramachandran
4 - Chemical Admixtures—Recent Developments

, Pages 137-184, V.S. Ramachandran
5 - Accelerators

, Pages 185-285, V.S. Ramachandran
6 - Water Reducers/Retarders

, Pages 286-409, Mario M. Collepardi
7 - Superplasticizers

, Pages 410-517, V.S. Ramachandran, V. Mohan Malhotra
8 - Air-Entraining Admixtures

, Pages 518-557, William L. Dolch
9 - Polymer-Modified Mortars and Concretes

, Pages 558-656, Yoshihiko Ohama, V.S. Ramachandran
10 - Mineral Admixtures

, Pages 657-739, R. Paul Lohtia, Ramesh C. Joshi
11 - Antifreezing Admixtures

, Pages 740-799, Victor B. Ratinov, Tatyana I. Rozenberg
12 - High-Volume Fly Ash and Slag Concrete

, Pages 800-838, V. Mohan Malhotra
13 - Admixtures for fix and recovery of Concrete

, Pages 839-877, Noel P. Mailvaganam
14 - Alkali-Aggregate enlargement and Corrosion Inhibiting Admixtures

, Pages 878-938, V.S. Ramachandran
15 - Miscellaneous Admixtures

, Pages 939-1024, Noel P. Mailvaganam
16 - Batching and allotting of Admixtures

, Pages 1025-1044, Noel P. Mailvaganam
17 - Admixture Formulations

, Pages 1045-1076, V.S. Ramachandran, Vasundhara S. Ramachandran
18 - Admixtures For Oilwell Cements

, Pages 1077-1111, John Bensted
Index

, Pages 1112-1153

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Extra resources for Concrete Admixtures Handbook. Properties, Science, and Technology

Sample text

T451With nitrogen, it varies from 3 to 147 m2/g. Solvent replacement techniques, used in place of d-drying technique, yield different surface areas. [36]t47] This may be responsible for the increased surface area. t481 The method of drying seems to determine the extent to which further layering and agglomeration of C-S-H sheets occurs during the removal of water, and this manifests itself in surface area decreases and shrinkage. Subsequent treatment, such as wetting and drying and application of stress, also affects these properties.

The unhydrated particles are shown in plate A. Within a few minutes of hydration the surface of the particles contains a non crystalline deposit (B). After three days of hydration, the features show a combination of Types I and II morphology (C and D). After seven days of hydration, a more compact structure consisting of massive plates of calcium hydroxide can be seen (E). At twenty-eight days, equant grains representing Type III morphology are discerned (F). The morphology of C,S hydrated for different periods is shown in plates F to K.

At high salt concentrations, other phenomena, such as a change in the range of freezing temperatures or the effect of high viscosity of the saline solution on the mechanical properties of the body, have to be considered. In concrete, the pores of the aggregate may be such that the pore water may readily freeze. Larger pores, equivalent to air-entrained bubbles (diameter > 100 A), may not exist in the aggregates. Thus, the tendency to expand due to freezing of water will either be taken up by elastic expansion of the aggregate or by water flowing out from the aggregate under pressure.

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