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, metakaolin-containing mortars with a water/binder ratio of 0.33 have been compared to silica fume for compressive strength enhancement.
138 citations
TL;DR: In this paper, the authors studied the effect of water leaching on reactive powder composites and found that the leaching greatly affects the microstructure, especially the anhydrous cement grains remaining in the paste.
Abstract: Reactive Powder Composites are new cement-based materials which could be used for the storage of nuclear wastes thanks to their excellent microstructural properties. This paper studies their durability when submitted in the laboratory to a water leaching attack. In order to understand the behaviour of the hydrates (CSH), the study was carried out on a pure cement paste and on a cement + silica fume paste. The beneficial effect of silica fume is demonstrated from considerations on the calcium leaching, from XRD analysis, from SEM observations and from the tritium diffusion and pore distribution analysis. It was found that the leaching greatly affects the microstructure, especially that of the anhydrous cement grains remaining in the paste.
138 citations
TL;DR: In this paper, the authors investigated the sulfate resistance of Portland cements and blended cements in sulfate solutions at different pH levels ranging from 3 to 12 using expansion of mortar prisms and strength development of mortar cubes.
Abstract: This paper presents an investigation into the sulfate resistance of Portland cements and blended cements. Four Portland cements of different characteristics and blended cements containing fly ash, ground granulated blast furnace slag and silica fume were used in this work. The performances of binders were evaluated in sulfate solutions maintained at different pH levels ranging from 3 to 12 using expansion of mortar prisms (ASTM C 1012) and strength development of mortar cubes. The results indicate that sulfate resistance of cementitious materials is dependent on its composition and on the pH of the environment. Portland cement with low C3A and low C3S performed well in all sulfate solutions. Blended cements containing silica fume and fly ash (particularly at 40% replacement) showed a more superior performance than any of the Portland cements used. For slag blended cement, this can be achieved when the replacement percentage is higher than 60%.
138 citations
TL;DR: In this article, a study was conducted to determine the possibility of producing and using fine glass powder (FGP) as a silica fume (SF) partial replacement in UHPC, and the results showed that FGP with a mean particle size (d50) of 3.8 µm could be recommended as an optimal PSD to fill the gap between cement and SF particles.
138 citations
TL;DR: In this paper, the authors assess the supply, demand, and cost of these raw materials, including fly ash, slag cement, metakaolin, sodium hydroxide, sodium silicate, and silica fume.
138 citations