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Posts published in “Durability of concrete and cement composites”

The purpose of this book is to bring together a series of reviews on topics of current relevance to the durability of concrete and cement-based composites. One might reasonably ask why such a book is now believed to be needed as concrete and related materials have been used with outstanding success in major construction projects for well over two thousand years. Indeed numerous ancient concrete structures, such as the Pantheon in Rome, and masonry structures with mortar joints, such as the Pont du Gard Aqueduct near NõÃmes in southern France (see Fig. 1.1), have survived to the present day in excellent states of preserva- tion. These and other examples of Roman construction works incorporating hydraulic cements made from lime and volcanic earth (or similar vitrified alumino-silicates, known collectively as pozzolanas, after Pozzuoli near Naples where a natural source of such material exists) have shown remarkable dur- ability even where they have been exposed to damp, aggressive environments. An impressive illustration was provided by Davey (1974) whose photograph of part of a Roman breakwater that had been exposed to the sea near Naples for two millennia (reproduced in Fig. 1.2), demonstrates that the mortar joints had endured far more successfully than the now heavily eroded stone blocks which they had been connecting.

Fracture mechanics

Linear elastic fracture mechanics is concerned with predicting conditions that give rise to rapid crack propagation in brittle materials that are considered to be elastic,…

Polymer impregnated concrete

A polymer impregnated concrete is produced via a process whereby an existing hardened concrete (structure or factory component) is dried at around 150ëC and then…

Reactive polymer matrix Thermal properties

In general the coefficients of thermal expansion for unfilled (lower modulus) and filled (higher modulus) products are ~40-100 and 20-40 10^-6 C^-1 respec- tively. This compares…

Reactive polymer matrix composites Creep

These materials are visco-elastic in nature and thus, over time, may undergo creep and stress relaxation even at ambient temperatures. For many applications, service stresses…

Reactive polymer matrix composites Introduction

These materials are quite different from polymer-modified mortars in that they do not contain any hydraulic cement. They consist of a synthetic resin binder incorporating…