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 use of recycled aggregate in the concrete industry has a great potential in reducing the demand for natural aggregate and the amount of solid waste dumped at landfill sites, and the main objective of this paper is to design a concrete made with different proportions of coarse recycled concrete aggregate (RCA) having a similar 28-day design strength to corresponding natural aggregate concrete.
Abstract: This paper shows how the use of recycled aggregate in the concrete industry has a great potential in reducing the demand for natural aggregate and the amount of solid waste dumped at landfill sites. The main objective of this paper is to design a concrete made with different proportions of coarse recycled concrete aggregate (RCA) having a similar 28-day design strength to corresponding natural aggregate concrete. Recycled coarse aggregates, obtained by crushing concrete debris from various sources, were used in three proportions of 30, 50, and 100% (by weight) in order to produce concrete with various water-cement ratios (w/c) and different compressive strength grades. The key mechanical properties and durability performance of concrete produced with portland silica fume (PSF) and RCA were investigated in the paper. The RCA used showed inferior mechanical properties (crushing and impact values) than the natural aggregates (NA) and, hence, RCA concrete exhibited slightly lower performance than NA concrete. The results presented in the paper showed that up to 30% coarse RCA had no major effect on the compressive strength of concrete and, thereafter, a gradual reduction in strength with an increase in RCA content was observed. Reducing the w/c of concrete treated with the RCA has led to an enhanced compressive strength, higher resistance to carbonation, and chloride ion ingress. It was also found that, when properly designed, portland cement silica fume (PC-SF) concrete made with different proportions of coarse RCA as substitute of NA may contribute to enhance the durability performance of concrete.
114 citations
TL;DR: In this paper, the interactions of silica fume (SF) with calcium hydroxide and with Portland cement have been studied using microscopy-based techniques and x-ray diffraction.
114 citations
TL;DR: In this paper, the porosity of plain Portland cement pastes and those containing silica fume or fly ash was assessed by several methods on plain and blended Portland Cement pastes.
114 citations
TL;DR: In this paper, the results of an ongoing test program to evaluate the performance of polymer-modified cement-based mortars for repairing surfaces of concrete structures up to a depth of 75 mm (3 inches) damaged due to exposure to cold climates are presented.
114 citations
TL;DR: In this article, the effect of using silica fume (SF) or rice husk ash (RHA) as supplementary cementing materials to improve concrete properties (durability, strength, etc.).
Abstract: Considerable efforts are being taken worldwide to utilize local natural waste and by-product materials in making concrete, such as silica fume (SF) or rice husk ash (RHA) as supplementary cementing materials to improve concrete properties (durability, strength, etc.). The effect of using SF or RHA as a partial replacement for cement has been investigated. Ilmenite and baryte were used as heavy aggregates while gravel was used as a reference normal aggregate. Physical, mechanical, and shielding properties of different types of heavy weight concrete were studied. The durability of the studied concrete was investigated. The study was extended to investigate the microstructure, the infrared and thermal analysis, and the effect of absorbed gamma radiation of the studied concrete types. Results showed that ilmenite concrete mixed with 15% SF had the highest density; compressive, tensile, flexural, and bond strengths; modulus of elasticity; and attenuation coefficient values. Concrete mixed with RHA had good res...
114 citations