Study on Microstructure and Rheological Properties of Cement-Chemical Admixtures-Water Dispersion System at Early Stage

Study on Microstructure and Rheological Properties of Cement-Chemical Admixtures-Water Dispersion System at Early Stage
Author: Yanrong Zhang
Publisher: Springer
Total Pages: 271
Release: 2017-07-25
Genre: Science
ISBN: 9811045704

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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.

Concrete Admixtures Handbook

Concrete Admixtures Handbook
Author: Vangipuram Seshachar Ramachandran
Publisher: William Andrew
Total Pages: 664
Release: 1984
Genre: Technology & Engineering
ISBN:

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Rheology of Fresh Cement-Based Materials

Rheology of Fresh Cement-Based Materials
Author: Qiang Yuan
Publisher: CRC Press
Total Pages: 339
Release: 2022-12-28
Genre: Technology & Engineering
ISBN: 1000821250

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This book introduces fundamentals, measurements, and applications of rheology of fresh cement-based materials. The rheology of a fresh cement-based material is one of its most important aspects, characterizing its flow and deformation, and governing the mixing, placement, and casting quality of a concrete. This is the first book to bring the field together on an increasingly important topic, as new types of cement-based materials and new concrete technologies are developed. It describes measurement equipment, procedures, and data interpretation of the rheology of cement paste and concrete, as well as applications such as self-compacting concrete, pumping, and 3D printing. A range of other cement-based materials such as fiber-reinforced concrete, cemented paste backfills, and alkali-activated cement are also examined. Rheology of Fresh Cement-Based Materials serves as a reference book for researchers and engineers, and a textbook for advanced undergraduate and graduate students.

Admixtures for Concrete - Improvement of Properties

Admixtures for Concrete - Improvement of Properties
Author: E. Vazques
Publisher: CRC Press
Total Pages: 653
Release: 2004-11-23
Genre: Architecture
ISBN: 0203008758

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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.

Effect of Chemical Admixtures on Rheology of Cement Paste at High Temperature

Effect of Chemical Admixtures on Rheology of Cement Paste at High Temperature
Author: S. Al-Martini
Publisher:
Total Pages: 17
Release: 2007
Genre: Cement paste
ISBN:

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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.

Application of Admixtures in Concrete

Application of Admixtures in Concrete
Author: A.M. Paillere
Publisher: CRC Press
Total Pages: 144
Release: 1994-10-13
Genre: Architecture
ISBN: 1482271532

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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.

Chemical Admixtures for Concrete

Chemical Admixtures for Concrete
Author: M. R. Rixom
Publisher: Spon Press
Total Pages: 334
Release: 1986
Genre: Technology & Engineering
ISBN:

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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.

Understanding the Rheology of Concrete

Understanding the Rheology of Concrete
Author: N Roussel
Publisher: Elsevier
Total Pages: 379
Release: 2011-12-20
Genre: Technology & Engineering
ISBN: 0857095285

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Estimating, modelling, controlling and monitoring the flow of concrete is a vital part of the construction process, as the properties of concrete before it has set can have a significant impact on performance. This book provides a detailed overview of the rheological behaviour of concrete, including measurement techniques, the impact of mix design, and casting. Part one begins with two introductory chapters dealing with the rheology and rheometry of complex fluids, followed by chapters that examine specific measurement and testing techniques for concrete. The focus of part two is the impact of mix design on the rheological behaviour of concrete, looking at additives including superplasticizers and viscosity agents. Finally, chapters in part three cover topics related to casting, such as thixotropy and formwork pressure. With its distinguished editor and expert team of contributors, Understanding the rheology of concrete is an essential reference for researchers, materials specifiers, architects and designers in any section of the construction industry that makes use of concrete, and will also benefit graduate and undergraduate students of civil engineering, materials and construction. Provides a detailed overview of the rheological behaviour of concrete, including measurement techniques, casting and the impact of mix design The estimating, modelling, controlling and monitoring of concrete flow is comprehensively discussed Chapters examine specific measurement and testing techniques for concrete, the impact of mix design on the rheological behaviour of concrete, particle packaging and viscosity-enhancing admixtures