Accession Number : AD0720755

Title :   Solidification of Portland Cement.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV BERKELEY DIV OF STRUCTURAL ENGINEERING AND STRUCTURAL MECHANICS

Personal Author(s) : Williamson,Robert Brady

Report Date : DEC 1970

Pagination or Media Count : 119

Abstract : Solidification of materials is introduced, and the constitution and hydration of portland cement is reviewed. Microstructural zones are introduced in the cement system: A 'columnar' zone of hydration products on solid surfaces are 'equiaxed' products which form within the originally water-filled space. The microstructure of hydrated beta-dicalcium silicate is shown in scanning electron micrographs of fracture surfaces of neat pastes at 60, 100, 171, and 384 days age. Similar micrographs for tricalcium silicate pastes and commercial portland cement pastes are shown and discussed. The hardening of portland cement is discussed as a solidification process. The potential flaws and stress concentrators within the cement paste are identified and their effect on mechanical properties is discussed. (Author)

Descriptors :   (*CEMENTS, CHEMICAL REACTIONS), HARDENING, MICROSTRUCTURE, ELECTRON MICROSCOPY, FRACTURE(MECHANICS), SILICATES, SURFACE PROPERTIES, COMPRESSIVE PROPERTIES

Subject Categories : Ceramics, Refractories and Glass
      Construction Equipment, Materials & Supplies

Distribution Statement : APPROVED FOR PUBLIC RELEASE