Topic
Silica fume
About: Silica fume is a research topic. Over the lifetime, 10177 publications have been published within this topic receiving 173857 citations.
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TL;DR: In this article, the addition of a second discontinuous filler (silica fume) to a composite with a comparably nonconducting matrix (cement) and a conducting discontinuous filling (carbon fibers) was found to increase electrical conductivity of the composite when the conducting filler volume fraction was less than 3.2%.
Abstract: The addition of a second discontinuous filler (silica fume) that is essentially nonconducting to a composite with a comparably nonconducting matrix (cement) and a conducting discontinuous filler (carbon fibers) was found to increase the electrical conductivity of the composite when the conducting filler volume fraction was less than 3.2%. The maximum conducting filler volume fraction for the second filler to be effective was only 0.5% when the second filler was sand, which was much coarser than silica fume. The improved conductivity due to the presence of the second filler is due to the improved dispersion of the conducting filler. The silica fume addition did not affect the percolation threshold, but the sand addition increased the threshold.
135 citations
TL;DR: In this paper, the differences of effect of silica fume in paste, mortar and concrete were studied by determining the non-evaporable water content of pastes, measuring the compressive strengths of pasted, mortars and concretes containing 5% and 10% raw silica Fume, respectively, with water-to-binder ratios (W/B) of 0.29 and 0.24 and investigating the properties of interfacial transition zone between hardened paste and aggregate.
134 citations
TL;DR: In this article, the authors compared the abrasion resistance of 12 concretes with the ASTM C779-82 (procedure C) testing method, focusing on the effect of water/cementitious ratio.
Abstract: The abrasion resistance of 12 concretes is compared with the ASTM C779-82 (procedure C) testing method. Four different types of aggregates were used; their source rocks are completely characterized in terms of compressive strength, modulus of elasticity, Los Angeles loss, and abrasion resistance. The first series of air-entrained concretes show that while silica fume can slightly improve concrete abrasion resistance, coarse aggregate nature is more significant. The second series, focusing on the effect of water/cementitious ratio (\IW\N/\IC\N) on abrasion resistance, reveal that as long as \IW\N/\IC\N is maintained at about 0.30, the concrete’s abrasion resistance almost equals that of the coarse-aggregate source rock. The third series demonstrates that abrasion resistance in high-strength concretes with very low \IW\N/\IC\N is largely determined by that of the coarse aggregate. It is noted, however, that when the wet-sieved concrete (mortar) and aggregate are of roughly equal abrasion resistance, the concrete itself exhibits slightly higher resistance than either of them alone.
134 citations
TL;DR: In this paper, the alite/belite 29Si MAS NMR spectrum for white Portland cement has been used for quantitative analysis of synthetic and natural cement minerals and for following the hydration of white Portland Cement.
134 citations
TL;DR: In this paper, the influence of the cement paste-aggregate interfacial transition zone (ITZ) on the frost durability of high-performance silica fume concrete (HPSFC) has been studied.
134 citations