By M.M. Page

ISBN-10: 0849391296

ISBN-13: 9780849391293

Concrete and different cement-based composites are via a long way the main prevalent man-made development fabrics on this planet. besides the fact that significant difficulties of infrastructure deterioration were as a result of unanticipated untimely degradation of those fabrics. toughness of Concrete and Cement Composites presents an up to date research of numerous of the most types of degradation, analyzing what's identified approximately their explanations and keep an eye on. The e-book starts with a evaluate of the actual and chemical features of cement-based fabrics then strikes directly to talk about particular kinds of degradation. It additionally examines developments in modelling and prediction of service-lives.

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40 paste hydrated for 14 days. Some years passed before the experiments described in Ref. 37 were independently repeated. Recently, Ye40 conducted similar comparisons of MIP and image analysis pore size distributions at the Technical University of Delft. 40 paste is given as Fig. 9. These results confirm and emphasize that continued reliance on MIP for measurement of pore size distribution in cement pastes and concretes is not justified, as the sizes obtained by MIP are not even approximately correct.

7. J. , `Solubility behavior of Ca-, S-,Al-, and Si- bearing solid phases in Portland cement pore solutions as a function of hydration time', Cem Concr Res 2002 32(10) 1663±1671. 8. , Cement Chemistry, 2nd edn, London, Thomas Telford, 1997. 9. , `Estimating the electrical conductivity of cement paste pore solutions from OH±, K+, and Na+ concentrations', Cem Concr Res 2003 33(6) 793±798. 10. , `The effects of two Danish fly ashes on alkali contents of pore solutions of cement-fly ash paste', Cem Concr Res, 1981 11(3) 383±394.

In many concretes, such dense areas of very limited porosity may border adjacent areas which display relatively large open pores and hollow shell grains. This irregular `patchy' structure will be discussed in a subsequent section. 5 The question of gel pores Pore structures surveyed so far include (1) air voids, typically tens or hundreds of m in size; (2) hollow shell pores, usually roughly 3 to 15 m in size, sometimes smaller; (3) groundmass spaces (`capillary pores') ranging from multi-m sizes to sizes well below the resolution of backscatter SEM, and (4) extremely fine, ca.

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Durability of Concrete and Cement Composites by M.M. Page


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