Showing papers on "Silica fume published in 1982"
TL;DR: In this article, a mixture of normal and highly reactive pozzolans, such as condensed silica-fume, was used to improve early strength and durability of concrete.
234 citations
TL;DR: In this paper, it was shown that amorphous silica can be reduced to polycrystalline silicon by magnesium at a comparatively low temperature (about 600°C) using differential thermal analysis and thermogravimetric analysis.
111 citations
Journal Article•
TL;DR: The literature on the properties of microsilica in concrete is reviewed in this article, where the authors present a review of the existing literature on micro-silica properties in concrete.
Abstract: Microsilica is a by-product from the ferro alloys industry. It consists of extremely fine, amorphous silica particles. Microsilica affects the propertiesw of fresh concrete, the pore size distribution and the hydration products formed during hydration, and hereby the mechanical properties and durability of the hardened cement based products. The literature on the properties of microsilica in concrete is reviewed. (Author)
35 citations
TL;DR: Puzzolanic i.e. calcium hydroxide binding property of two samples of silica-fumes has been investigated in this article, and the results show that the puzzolanic activity of these fume samples were not very high.
29 citations
TL;DR: In this paper, the authors studied the physical properties and placement characteristics of cementitious mortars for their potential as repository sealing materials, including their compressive strength up to 240 MPa combined with very low intrinsic permeability −8 Darcy (μm 2 ) on material having a viscosity of 5000 cP (mPa·s) at 38° C.
Abstract: Physical properties and placement characteristics of cementitious mortars have been studied for their potential as repository sealing materials. They contained various expansive agents and industrial by-products, and were investigated at curing temperatures up to 250° C, the upper limit of an emplacement site or generally of relevance in accelerated reaction studies. An expansive agent, magnesium oxide, and two industrial by-products, silica fume and granulated blast furnace slag have been used at different percentages in the mixtures. Excellent general performance, including very high strengths up to 240 MPa combined with very low intrinsic permeability −8 Darcy (μm 2 ) were generated at 175°C on material having a viscosity of 5000 cP (mPa·s) at 38° C. One 1700 cP(mPa·s) material treated at 250°C had compressive strength >180 MPa and also −8 Darcy (μm 2 ) permeability. MgO was found to accelerate formation of tobermorite and generally cause expansion; at 250° C expansion was also related to xonotlite formation.
3 citations