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, a potential gradient is applied across the specimen, which accelerates the dissolution of cement hydrate from mortar in contact with water, and the pore volume of the degraded specimens increased as a result of mortar hydrate dissolution.
114 citations
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TL;DR: In this article, the effect of elevated temperature on the compressive and tensile strength, spalling, and mass loss of high strength concrete (HSC) modified with nano-silica (nS) was studied.
114 citations
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TL;DR: In this paper, a Portland cement free, alkali-activated material was optimized in order to enhance strength and durability, achieving a w/b ratio of less than 0.25.
Abstract: Based on the principles of ultra-high performance concrete (UHPC) a Portland cement free, alkali-activated material was optimized in order to enhance strength and durability. The formulation is based on ground granulated blast furnace slag and as an activator a combination of potassium water-glass and potassium hydroxide was used. Furthermore, silica fume and metakaolin as inorganic fines were used to increase the packing density of the mixture. Quartz sand (0–2 mm) and quartz powder were added as aggregates. The results comprise an enhancement of the rheological properties by the stepwise increase of silica fume. A w/b ratio of less than 0.25 was realised using a certain mixing procedure with a high intensity mixer. The compressive strength reaches values comparable with the strength range of an UHPC. The already low capillary porosity could further be decreased by the substitution of slag with a small amount of metakaolin, which is leading to a higher polymerisation degree due to an incorporation of aluminium in the reaction products. The enhanced polymerisation degree was estimated by FTIR and XRD. Although no effective superplasticizer can be used in this high alkaline material, the low w/b ratio and a good workability can be achieved by using certain amounts of silica fume.
113 citations
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TL;DR: In this article, the coupling effects of incorporating silica fume (SF) and rubber particles on the compressive performance of rubberized steel-fibre recycled aggregate concrete (RSRAC) were investigated.
113 citations
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TL;DR: In this paper, the effects of particle size distribution and fly ash source on the mechanical and microstructural properties of fly ash-based geopolymer concrete were investigated, and it was shown that the resulting compressive strength is linearly affected by the average particle size distributions.
113 citations