By Zongjin Li
Over the last 20 years concrete has loved a renewed point of analysis and checking out, leading to the improvement of many new sorts of concrete. by using numerous ingredients, creation recommendations and chemical approaches, there's now an excellent measure of keep watch over over the houses of particular concretes for a variety of purposes. New theories, types and trying out recommendations have additionally been built to push the envelope of concrete as a development fabric. there isn't any present textbook which brings all of those developments jointly in one quantity. This booklet goals to bridge the space among the normal concrete applied sciences and the rising cutting-edge applied sciences that are gaining wider use.
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Extra resources for Advanced Concrete Technology
Heavy-weight aggregate: If the unit weight of aggregate is greater than 2100 kg/m3 , it is classiﬁed as heavy-weight aggregate. Materials used as heavy-weight aggregate are iron ore, crashed steel pieces, and magnesite limonite. The bulk density of the corresponding concrete is greater than 3200 kg/m3 and can reach 4000 kg/m3 . This kind of concrete has special usage, like radiation shields in nuclear power plants, hospitals, and laboratories. It can also be used as sound-shielding material. 1 Moisture conditions The moisture condition deﬁnes the presence and amount of water in the pores and on the surface of the aggregate.
The main principle of curing is to keep favorable moist conditions under a suitable temperature range during the fast hydration process for concrete. It is a very important stage for the development of concrete strength and in controlling early volume changes. Fresh concrete requires considerable care, just like a baby. Careful curing will ensure that the concrete is hydrated properly, with good microstructure, proper strength, and good volume stability. On the other hand, careless curing always leads to improper hydration with defects in the microstructure, insufﬁcient strength, and unstable dimensions.
Aitcin, P. , and Richard, P. (1998) “The Sherbrooke reactive powder concrete dootbridge,” Structural Engineering International 8(2), 140–144. Caldarone, M. A. (2009) High-strength concrete: a practical guide, London: Taylor & Francis. Collins, P. (2004) Concrete: the vision of a new architecture, Montreal: McGill-Queen’s University Press. , and McNeil, I. (1996) Biographical dictionary of the history of technology, New York: Routledge. Encyclopaedia Britannica, Inc. (1991) The new encyclopaedia Britannica, 15th edition, Chicago, IL: Encyclopaedia Britannica.