Effect Of Chemical Admixtures On Portland Cement Hydration
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Effect Of Chemical Admixtures On Portland Cement Hydration
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Author : I. Odler
language : en
Publisher:
Release Date : 1987
Effect Of Chemical Admixtures On Portland Cement Hydration written by I. Odler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Calcium chloride categories.
The effect of selected chemical admixtures on the progress of portland cement hydration, composition of the hydration products, and strength development was studied. Calcium chloride (CaCl2) accelerated the hydration of both tricalcium silicate (C3S) and tricalcium aluminate (C3A) and increased the calcium oxide/silicon dioxide (CaO/SiO2) ratio of the formed calcium-silicate-hydrate (CSH) phase. In the presence of zinc oxide (ZnO), Na-lignosulfonate, and a melamine resin, the hydration of both C3S and C3A was retarded, while in the presence of sucrose only that of C3S. The effect of all these additives was more pronounced if pure C3S rather than portland cement was employed. Regardless of the kind and amount of admixture added (except high amounts of CaCl2) and hydration time, the bound water content, amount of liberated calcium hydroxide, and compressive strength were linear functions of the amount of hydrated C3S.
Study On Microstructure And Rheological Properties Of Cement Chemical Admixtures Water Dispersion System At Early Stage
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Author : Yanrong Zhang
language : en
Publisher: Springer
Release Date : 2017-07-25
Study On Microstructure And Rheological Properties Of Cement Chemical Admixtures Water Dispersion System At Early Stage written by Yanrong Zhang and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-07-25 with Science categories.
This thesis studies the effects of superplasticizers, polyacrylate latexes and asphalt emulsions, which differ in molecular/particle size from nanometers to microns, on the rheological properties of fresh cement pastes (FCPs), as well as the action mechanisms involved. It systematically investigates the rheological properties and microstructure of cement-based materials, and elucidates the adsorption behaviors of polycarboxylate polymers with different functional groups and their effects on cement hydration. Moreover, it reveals how the working mechanism of naphthalene sulfonate formaldehyde (NSF) differs from that of polycarboxylate ether-based (PCE) superplasticizers. Lastly, it develops a conceptual microstructure model and two rheological equations. These findings lend theoretical support to the development of new chemical admixtures and new, higher-performance, cement-based composites.
Chemical Admixtures For Concrete
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Author : M. R. Rixom
language : en
Publisher: Spon Press
Release Date : 1986
Chemical Admixtures For Concrete written by M. R. Rixom and has been published by Spon Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Technology & Engineering categories.
Chemical admisxtures are used in concrete mixtures to produce particular engineering properties such as rapid hardening. "Chemical Admixtures for Concrete" surveys the recent developments in admixture technology, explaining the mechanisms by which admixtures produce their effects, the various types of admixtures available and their selection and use.
Science And Technology Of Concrete Admixtures
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Author : Pierre-Claude Aïtcin
language : en
Publisher: Woodhead Publishing
Release Date : 2015-11-12
Science And Technology Of Concrete Admixtures written by Pierre-Claude Aïtcin and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-11-12 with Technology & Engineering categories.
Science and Technology of Concrete Admixtures presents admixtures from both a theoretical and practical point-of-view. The authors emphasize key concepts that can be used to better understand the working mechanisms of these products by presenting a concise overview on the fundamental behavior of Portland cement and hydraulic binders as well as their chemical admixtures, also discussing recent effects in concrete in terms of rheology, mechanics, durability, and sustainability, but never forgetting the fundamental role played by the water/binder ratio and proper curing in concrete technology. Part One presents basic knowledge on Portland cement and concrete, while Part Two deals with the chemical and physical background needed to better understand what admixtures are chemically, and through which mechanism they modify the properties of the fresh and hardened concrete. Subsequent sections present discussions on admixtures technology and two particular types of concrete, self-consolidating and ultra-high strength concretes, with final remarks on their future. Combines the knowledge of two leading authors to present both the scientific and technology of admixtures Explains what admixtures are from a chemical point-of-view and illustrates by which mechanisms they modify the properties of fresh and hardened concrete Presents a fundamental, practical, and innovative reference book on the topic Contains three detailed appendices that can be used to learn how to use admixtures more efficiently
Admixtures For Concrete Improvement Of Properties
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Author : E. Vazques
language : en
Publisher: CRC Press
Release Date : 2004-11-23
Admixtures For Concrete Improvement Of Properties written by E. Vazques and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-11-23 with Architecture categories.
Chemical admixtures are used to modify the properties and behaviour of fresh and hardened concrete. They enable more economic construction and the achievement of special properties such as high strength or durability. This book presents new research information from an International RILEM Symposium on six main topics: workability, setting, strength, durability, other properties and technology.
Application Of Admixtures In Concrete
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Author : A.M. Paillere
language : en
Publisher: CRC Press
Release Date : 2004-03-01
Application Of Admixtures In Concrete written by A.M. Paillere and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-03-01 with Architecture categories.
This book provides a thorough review of the properties and use of the principal chemical admixtures for use in concrete. Concise and clearly presented, the book includes extensive references to key sources of information. The presentation of each admixture is in a standard format, which helps the reader to find relevant information easily.
Concrete Admixtures
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Author : V.H. Dodson
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29
Concrete Admixtures written by V.H. Dodson and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-29 with Technology & Engineering categories.
Effect Of Chemical Admixtures On Rheology Of Cement Paste At High Temperature
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Author : S. Al-Martini
language : en
Publisher:
Release Date : 2007
Effect Of Chemical Admixtures On Rheology Of Cement Paste At High Temperature written by S. Al-Martini and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Cement paste categories.
Placement of cement-based materials in hot weather conditions encounters many problems due to the rapid evaporation of mixing water and the accelerated hydration of cement. Such materials are also adversely affected at elevated temperatures by an increased water demand, shorter setting time, and more rapid slump loss. These problems can be mitigated using adequate chemical admixtures. However, technical data on such admixtures are commonly developed at normal temperatures, and there is a real need to investigate their performance at hot temperatures. In the current research, the rheological properties of portland cement pastes with a water-cement ratio (w/c) of 0.35 and 0.50 are investigated at different temperatures in the range of 20 to 45°C using an advanced shear-stress/shear-strain controlled rheometer. The influence of water-reducing and retarding admixture, polycarboxylate, naphthalene sulfonate, and melamine-based high-range water-reducing admixtures (HRWR) in addition to mid-range water-reducing admixtures (MRWR) on the rheological properties of cement paste at various temperatures was also examined. The paper aims at formulating recommendations for the effective use of chemical admixtures at high temperature, which should enhance the rheological properties of cement-based materials in hot weather conditions.
Symposium On Effect Of Water Reducing Admixtures And Set Retarding Admixtures On Properties Of Concrete
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Author :
language : en
Publisher: ASTM International
Release Date : 1960
Symposium On Effect Of Water Reducing Admixtures And Set Retarding Admixtures On Properties Of Concrete written by and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1960 with categories.
Pro 5 International Rilem Conference On The Role Of Admixtures In High Performance Concrete
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Author : Joseph G. Cabrera
language : en
Publisher: RILEM Publications
Release Date : 1999
Pro 5 International Rilem Conference On The Role Of Admixtures In High Performance Concrete written by Joseph G. Cabrera and has been published by RILEM Publications this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Admixtures categories.