Strengthening effects of finely ground fly ash, granulated blast furnace slag, and their combination

Journal Article · Tue Dec 01 00:00:00 EST 1998 · Cement and Concrete Research

DOI:https://doi.org/10.1016/S0008-8846(98)00158-6· OSTI ID:323692

Tan, K ^[1]; Pu, X ^[2]

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1. Southwest Inst. of Tech., Mianyang, Sichuan (China)
2. Chongqing Jianzhu Univ. (China)

The effect of finely ground fly ash (FGFA), finely ground granulated blast furnace slag (FGGBS), and their combination on the compressive strength of concrete was studied. Test results showed that incorporating 20% FGFA or FGGBS can significantly increase the compressive strength of concrete after 3 days. The compressive strength of concrete incorporating the combination of FGFA and FGGBS is higher than both FGFA concrete and FGGBS concrete, and is quantitatively similar to that of silica fume concrete. Scanning electron microscopic analysis showed that, after the incorporation of the combination of FGFA and FGGBS, a great quantity of a stick-like substance exist in the surface of hardened paste being investigated. The electron probe x-ray microanalyzer analysis showed that the stick-like substance was most probably the sheet C-S-H rolled up during specimen preparation for scanning electron microscopic analysis, which may be the mechanism of the strengthening effect of the combination of FGFA and FGGBS.

• OSTI ID: 323692
• Journal Information: Cement and Concrete Research, Vol. 28, Issue 12; Other Information: PBD: Dec 1998
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
01 COAL, LIGNITE, AND PEAT
COMPRESSION STRENGTH
CONCRETES
FLY ASH
SLAGS
WASTE PRODUCT UTILIZATION
CONCENTRATION RATIO
ELECTRON MICROSCOPY
ELECTRON MICROPROBE ANALYSIS