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Supplementary Cementing Materials in Concrete

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Descripción

Supplementary cementing materials (SCMs), such as fly ash, slag, silica fume, and natural pozzolans, make a significant difference to the properties of concrete but are rarely understood in any detail. SCMs can influence the mechanical properties of concrete and improve its durability in aggressive environments. Supplementary Cementing Materials in Concrete covers the chemical, physical, and mineralogical properties of SCMs; their chemical reactions; and the resulting changes in the microstructure of concrete.


Características

  • ISBN: 978-1-46-657298-0
  • Páginas: 210
  • Tamaño: 17x24
  • Edición:
  • Idioma: Inglés
  • Año: 2013

Disponibilidad: 15 a 30 Días

Contenido Supplementary Cementing Materials in Concrete

Supplementary cementing materials (SCMs), such as fly ash, slag, silica fume, and natural pozzolans, make a significant difference to the properties of concrete but are rarely understood in any detail. SCMs can influence the mechanical properties of concrete and improve its durability in aggressive environments. Supplementary Cementing Materials in Concrete covers the chemical, physical, and mineralogical properties of SCMs; their chemical reactions; and the resulting changes in the microstructure of concrete.

The author links the properties of the material at the microstructural level with its behavior in laboratory tests, and, in turn, to the performance of the material in concrete structures under field exposure. He explains how SCMs influence the mechanical properties of concrete and improve its durability and also covers how various SCMs influence hydration reactions and the evolution of the pore structure and pore-solution composition.

However, SCMs are not a panacea for concrete and improper use may be injurious to certain properties. Achieving the maximum benefit from SCMs requires an understanding of the materials and how they impact concrete properties under various conditions. Drawing on the author’s 30 years of experience, this book helps engineers and practitioners to optimize the use of supplementary cementing materials to improve concrete performance.

Contents

Introduction

Origin and Nature of SCM’s

General

Fly Ash

Slag

Silica Fume

Natural Pozzolans

Chemical Reactions of SCM’s in Concrete

Pozzolanic Reactions

Hydration of Slag

Effect of SCM’s on the Hydration of Portland Cement

Effect of SCM’s on the Pore Solution Composition

Microstructure of Portland Cement – SCM Systems

Pore Structure

Interfacial Transition Zone, ITZ

Pore Blocking and Mass Transport

Properties of Fresh Concrete

Workability and Water Demand

Bleeding

Air Entrainment

Setting Time

Temperature Rise and Risk of Thermal Cracking

Temperature Rise

Risk of Thermal Cracking

Mechanical Properties

Volume Stability

Chemical and Autogenous Shrinkage

Drying Shrinkage

Creep

Temperature Changes

Durability of Concrete

Permeability

Corrosion of Steel Reinforcement, Chloride Ingress and Carbonation

Resistance to Freezing and Thawing, and De-Icer Salt Scaling

Alkali-Silica Reaction (ASR)

Sulfate Attack

Heat-Induced Delayed Ettringite Formation

"Physical" Salt Attack

Other Forms of Chemical Attack

Abrasion, Erosion and Cavitation

Specifications

ASTM Specifications for SCM’s

ASTM Specifications for Blended Cements – ASTM C 595

ASTM Performance Specification for Hydraulic Cements – ASTM C 1157

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