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Strength improvement efficiency of mineral admixtures in concrete
Blending by mineral admixtures influences most properties of cement and concrete, whereby the effective level is governed by the characteristics of the admixtures as well as by the replacement level. At optimum replacement levels, blending can improve the strength of cement and concrete. However, the strength improvement levels are different for paste, mortar and concrete. Strength increase is stemming from improvements in the paste structure, as well as in the interfacial transition zone between paste and aggregate particles. These improvements are resulting from pozzolanic (chemical) and filler (physical) effects. This paper presents information an the effects of blending by Metakaolin (MK) and Rice husk ash (RHA) an concrete strength. The trial testing program encompassed concrete mixtures with various contents of Portland cement blended with 10-20 % MK or MK+RHA. The experimental data show that the binder content affected the strength to different degrees in Portland cement-based concretes blended with optimum amounts of either MK or MK+RHA. In particular, strength improvements due to blending were found more significant in concrete with low binder content, whereby the efficiency of blending gradually reduced at increasing binder contents. Most favorable results as to the efficiency of blending were obtained by combined use of the mineral admixtures
Strength improvement efficiency of mineral admixtures in concrete
Blending by mineral admixtures influences most properties of cement and concrete, whereby the effective level is governed by the characteristics of the admixtures as well as by the replacement level. At optimum replacement levels, blending can improve the strength of cement and concrete. However, the strength improvement levels are different for paste, mortar and concrete. Strength increase is stemming from improvements in the paste structure, as well as in the interfacial transition zone between paste and aggregate particles. These improvements are resulting from pozzolanic (chemical) and filler (physical) effects. This paper presents information an the effects of blending by Metakaolin (MK) and Rice husk ash (RHA) an concrete strength. The trial testing program encompassed concrete mixtures with various contents of Portland cement blended with 10-20 % MK or MK+RHA. The experimental data show that the binder content affected the strength to different degrees in Portland cement-based concretes blended with optimum amounts of either MK or MK+RHA. In particular, strength improvements due to blending were found more significant in concrete with low binder content, whereby the efficiency of blending gradually reduced at increasing binder contents. Most favorable results as to the efficiency of blending were obtained by combined use of the mineral admixtures
Strength improvement efficiency of mineral admixtures in concrete
Effizienz der Festigkeitserhöhung durch mineralische Zuschlagsstoffe in Beton
Dinh Dau, V. (author) / Stroeven, P. (author)
2003
8 Seiten, 2 Bilder, 2 Tabellen, 15 Quellen
Conference paper
English
STRENGTH IMPROVEMENT EFFICIENCY OF MINERAL ADMIXTURES IN CONCRETE
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