✦ LIBER ✦

Mechanical behavior and microstructural development in phosphate modified high alumina cement

✍ Scribed by Weiping Ma; Paul W. Brown

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 466 KB
Volume: 22
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(92)90048-z

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✦ Synopsis

High alumina cement was modified by phosphate-based reactants and the variations in mechanical properties were investigated. The flexural strength is greatly improved by addition of various sodium-based inorganic polymers and calcium phosphate. The shortterm flexural strengths of samples containing 20 wt.% of these constituents can reach over 40 MPa, while that of corresponding pure cement cured under the same conditions is approximately 14 MPa. After ten months of curing, the strengths of the modified samples continue to be more than twice as high as that of pure cement. The mechanism responsible for strength increase in this material was studied by X-ray diffraction and mercury intrusion porosimetry. Experimental results indicate that these phosphate-based compounds do not form crystalline hydration products but provide structural integrity to high alumina cement by decreasing the porosity.

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