M-11: The Visible & Invisible Cracking of Concrete

Description

When concrete deteriorates, the blame usually falls on the curing, the aggregate, the mixture, or the quality control. Cement composition is seldom considered. Perhaps this is because all cements of the same type are believed to be equal if they have passed the same standard tests. However, cements of the same type, but from different plants, can vary widely in the property of extensibiity (the resistance to cracking). Causes of self-stress are discussed in relation to cement content, water-cement ratio, cement fineness, alkalies, admixtures, and other factors.

Document Details

Author: Richard W. Burrows

Publication Year: 1998

Pages: 78

ISBN: 9780870310478

Categories: Cracking

Formats: PDF

This document is Historical

Table of Contents

-Summary

-Brief History of the Cracking of Concrete

-Introduction

-Six Effects of Drying Concreet

-When & Where Concrete Dries

-Creep & the 70-year Trend Towards Zero Creep

-Moist Curing

-Effect if Alkalies- - the Green Mountain Dam Experience

-Alkalies Versus Early Hydration Morphology

-Effect of Alkalies - - Work of Blaine et al.

-Credibility of Blaine's Ring Shrinkage Test

-Recommended Test for Evaluation of Cements

-Summary of Other Cracking Tests

-Effect of Cement Fineness

-Effect of Tricalcium Aluminate

-Effect of Dicalcium Silicate & Tricalcium Silicate

-Effect of S03

-Effects of Cement Content & Water-Cement Ratio

-High-Performance Concrete

-Effect of Water-Cement Ratio on Alkali-Silica Reaction

-Case for Weaker Concrete

-Are Lean Concretes Durable?

-Hydration Accelerating Admixtures

-Hydration Develerating Admixtures

-Effect of Aggregate on Shrinkage

-Autogenous Shrinkage

-Effect of Silica Fume on Four Types of Shrinkage

-Thermal Contraction

-What Cracking Tests Should Be Used?

-Relative Magnitudes of Autogenous Shrinkage,

Drying Shrinkage & Thermal Contraction

-Bridge Deck Construction

-Problem of Excessive Safety Factors

-Recipe for Durable Bridge Deck Concrete

-Parking Garages

-Corrosion of Reinforcing Steel

-Deicer Salt Scaling

-Misdiagnosis of Alkali-Silica reaction

-Hypothesis to Explain Cement-Aggregate Reaction

-Fly Ash

-Proposed Test Program

-Adaption of Concrete Weathering

-Solving the Problem of Concrete Durability

-Four Qualifying Stetements

-Recommendations

-Acknowledgements

-References

-Appendix

-Index

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