By Zongjin Li
Over the last 20 years concrete has loved a renewed point of study and checking out, leading to the advance of many new sorts of concrete. by using numerous ingredients, creation innovations and chemical methods, there's now a superb measure of keep watch over over the homes of particular concretes for quite a lot of purposes. New theories, types and trying out options have additionally been constructed to push the envelope of concrete as a construction fabric. there is not any present textbook which brings all of those developments jointly in one quantity. This e-book goals to bridge the distance among the conventional concrete applied sciences and the rising cutting-edge applied sciences that are gaining wider use.
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Additional info for Advanced Concrete Technology
The initial formation of C2 S occurs at a temperature of around 1200◦ C. C3 S is formed around 1400◦ C. 3CaO · SiO2 Limestone (1450◦ C) 2CaO · SiO2 Clay −−−−−−−−−−→ (2-21) High temperature 3CaO · Al2 O3 Iron ore, bauxite 4CaO · Al2 O3 · Fe2 O3 (e) The ﬁnal product from the rotary kiln is called clinker. Pulverizing the clinker into small sizes (<75 µm) with addition of 3–5% gypsum or calcium sulf produces the Portland cement. Gypsum added is to control fast setting caused by 3CaO · Al2 O3 .
Any sieve size between full-size sieves is called half-size. 1. A small number indicates a ﬁne grading, whereas a large number indicates a coarse material. The ﬁneness modulus can be used to check the constancy of grading when relatively small changes are expected, but it should not be used to compare the gradings of aggregates from two different sources. The ﬁneness modulus of ﬁne aggregates is required for the mix proportion since sand gradation has the largest effect on workability. A ﬁne sand (low ﬁneness modulus) has much higher paste requirements for good workability.
To overcome these problems, other different cementitious materials have been developed recently. Two of them to be discussed in this chapter are geopolymer and magnesium phosphate cement (MPC). Compared with Portland cement, the properties of these two cements have some advantages to the sustainable development of modern society. 2 Portland cement Development of Portland cement can be summarized as follows: 1796 1813 1824 James Parker Vicat Joseph Aspdin England France England Patent on a natural hydraulic cement Artiﬁcial hydraulic lime Portland cement Portland cement was developed by Joseph Aspdin in 1824, so named because its color and quality are similar to a kind of limestone, Portland stone (Portland, England).
Advanced Concrete Technology by Zongjin Li