✦ LIBER ✦

High strength generation in cement pastes

✍ Scribed by Della M. Roy; G.R. Gouda

Publisher: Elsevier Science
Year: 1973
Tongue: English
Weight: 767 KB
Volume: 3
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(73)90013-6

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✦ Synopsis

Unusually high strengths have been generated in materials produced by employing "hot-pressing" techniques, and intermediate ranges of strengths have been achieved by applying high pressures at room temperature, to portland cement pastes. By pressing at ca. 250°C and 50, 000 psi strengths are as high as 95,000 psi (compressive), and 9250 psi (indirect tensile). The hot-pressed materials are volume stable when immersed in water and subsequently evacuated. The microstructures of such materials are very compact, consisting of an [ntergrowth of dense hydrated cement "gel" surrounding residual unhydrated cement grain cores. The lowest porosity of the materials measured was approximately 1.8%, by far the closest approach to zero porosttyor theoretical density yet achieved in cement pastes. The effect of mLcrostructure and porosity are discussed, and high pressure techniques are compared with other methods of strength generation.

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