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Get Advanced Concrete Technology 1: Constituent Materials PDF

By John Newman, B S Choo

ISBN-10: 0080489982

ISBN-13: 9780080489988

ISBN-10: 0750651032

ISBN-13: 9780750651035

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Additional resources for Advanced Concrete Technology 1: Constituent Materials (Advanced Concrete Technology Set)

Example text

02 Calcium carbonate Pozzolanic materials contain reactive (usually in glassy form) silica and alumina, which are able to react with the calcium hydroxide released by hydrating cement, to yield additional C–S–H hydrate and calcium aluminate hydrates. This reaction is much slower than the hydration of the clinker silicates and the strength development of pozzolanic cements is slower than that of ‘pure’ Portland cements. Provided moist curing is maintained, Cements ultimate strengths may be higher than those of ‘pure’ Portland cement concrete.

The C–S–H gel which forms around the larger C3S and C2S grains is formed in situ and has a rather dense and featureless appearance when viewed using an electron microscope. This material is formed initially as reaction rims on the unhydrated material but as hydration progresses the anhydrous material is progressively replaced and only the largest particles (larger than ~30 microns) will retain an unreacted core after several years’ hydration. This dense hydrate is referred to as the ‘inner product’.

9 Simplified illustration of hydration of cement paste. 7). Setting is largely due to the hydration of C3S and it represents the development of hydrate structure, which eventually results in compressive strength. The C–S–H gel which forms around the larger C3S and C2S grains is formed in situ and has a rather dense and featureless appearance when viewed using an electron microscope. This material is formed initially as reaction rims on the unhydrated material but as hydration progresses the anhydrous material is progressively replaced and only the largest particles (larger than ~30 microns) will retain an unreacted core after several years’ hydration.

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Advanced Concrete Technology 1: Constituent Materials (Advanced Concrete Technology Set) by John Newman, B S Choo


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