Cement composites Terminology
A number of subject specific terms are useful in order to discuss concisely frc structure and behaviour. The term frc […]
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.
A number of subject specific terms are useful in order to discuss concisely frc structure and behaviour. The term frc […]
Since passivity represents the principal mechanism by which steel is protected from corrosion in concrete, it is necessary to consider the
As noted previously, the reactions between atmospheric CO2 and alkaline components of concrete produce a carbonated surface layer in which
Brittle fracture may occur in high-strength steels, particularly under the influ- ence of rapidly applied tensile stress. This is the
During the hydration of Portland cement at temperatures around ambient, ettringite is formed at early ages, a consequence of the
Background Internal sulfate attack and delayed ettringite formation Read Post »
Although thaumasite had been known as a rare calcium carbonate-silicate- sulfate hydrate of the composition CaCO3.CaSiO3.CaSO4.15H2O since 1878, it was
In general, the rates of attack by aggressive chemicals on concrete may be affected by several factors, including the following:
Background Degradative effects of water, acids and other aggressive chemicals Read Post »
The investigation of reinforced concrete structures that are suspected to be suffering from corrosion is commonly undertaken by specialist materials
Assessment andmonitoring of corrosion in reinforced concrete Read Post »
It is evident from the current literature that mercury intrusion porosimetry (MIP) continues to be by far the most widely
In order to discuss the time-dependent changes in the behaviour of frc, it is necessary to introduce in broad terms the
Aspects of the mechanical behaviour of brittle matrix composites Read Post »