Microstructure and properties of the binder of fly ash-fluorogypsum-Portland cement

Journal Article · Sun Feb 28 23:00:00 EST 1999 · Cement and Concrete Research

DOI:https://doi.org/10.1016/S0008-8846(98)00214-2· OSTI ID:351537

Yan, P; Yang, W; Qin, X; You, Y ^[1]

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1. Tsinghua Univ., Beijing (China)

The hydration process, mortar microstructure, and properties of the binder consisting of fly ash, fluorogypsum, and Portland cement were investigated with X-ray diffraction, differential thermal analysis, scanning electron microscopy with energy dispersing spectrum, and mercury intrusion porosimetry. Its major hydrates are hydraulic gypsum solid solution, CSH gel, and ettringite. The addition of alum activator enhanced the formation of ettringite and the transformation of anhydrite into gypsum. They intermix uniformly to form a dense mortar structure with very low porosity and low proportion of large pores. The binder shows high strength, good volume stability, and excellent water resistance. The properties of the binder can be adjusted by the quantity of alum added to prepare shrinkage-free or microexpansive concrete.

• OSTI ID: 351537
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 3 Vol. 29; ISSN CCNRAI; ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
BINDERS
CONCENTRATION RATIO
FLY ASH
GYPSUM
MECHANICAL PROPERTIES
MICROSTRUCTURE
PHYSICAL PROPERTIES
POROSITY
PORTLAND CEMENT
WASTE PRODUCT UTILIZATION