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 paper, the suitability of a particular binder system for an application based on fresh concrete properties and mechanical properties was evaluated for concrete mixes having a fixed waterbinder ratio of 0.35 and a constant total binder content of 430 kg/m3.
251 citations
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TL;DR: In this article, a critical review on the rheological properties of fresh concrete in recent publications is revealed, and the applications of rheograph and workability box in mixture proportioning and quality control are also illustrated.
Abstract: The rheology is an effective tool to characterize workability, consistency, flowability, and predict stability, pumpability, shootability, pressure of formwork, multi-layer casting. This paper presents a critical review on the rheological properties of fresh concrete in recent publications. The applicable rheological models for the flow of concrete are revealed. The effects of constituents of fresh concrete, including cement, supplementary cementitious materials (fly ash, ground blast furnace slag, and silica fume), limestone powder, coarse and fine aggregates, and chemical admixtures (superplasticizer, viscosity modifying agent and air-entraining agent) on the rheological properties are discussed in detail. The applications of rheograph and workability box in mixture proportioning and quality control are also illustrated.
250 citations
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TL;DR: An equivalent circuit model for AC electrochemical impedance spectroscopy (EIS) of concrete has been proposed, which contains parameters R-CCP, the resistance of the continuously connected micro-pores in the concrete; R-CP, the resistances of the discontinuously connected micropores, blocked by cement paste layers in concrete; C-mat, the capacitance across the concrete matrix; and C-DP, the capacity of the cement paste layer blocking the discontini cational micro pores in concrete.
249 citations
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TL;DR: In this paper, the effect of up to 2% of loading on the microstructural, physical, and mechanical properties of hybrid CNF/silica fume cement composites has been studied.
247 citations
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TL;DR: In this paper, the effect of different amounts of silica fume (SF) and water to cement ratios (w/c) on the residual compressive strength of high-strength concrete after exposure to high temperatures was investigated.
Abstract: This paper presents the results of an experimental investigation on the effect of different amounts of silica fume (SF) and water to cement ratios (w/c) on the residual compressive strength of high-strength concrete after exposure to high temperatures. Based on the results obtained the rates of strength loss for concrete specimens containing 6% and 10% SF at 600 °C were 6.7% and 14.1% lower than those of the ordinary concrete. The dosage of SF had no significant effect on the relative residual compressive strength at 100 and 200 °C, whereas the amount of SF had considerable influences on the residual compressive strength above 300 °C similar to the response at 600 °C. The optimum dosage of SF and w/c was found to be 6% and 0.35, respectively.
246 citations