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 strengths and chloride penetration resistance of a series of high-performance concretes were measured after curing either at 23 °C or accelerated by heating to 65 °C.
84 citations
TL;DR: In this article, the authors focused on the mechanical, fracture and durability characteristics of self-compacting high-strength concrete (SCHSC) containing recycled polypropylene plastic particles (RPPP) with and without silica fume (SF).
Abstract: This study focuses on the mechanical, fracture and durability characteristics of self-compacting high-strength concrete (SCHSC) containing recycled polypropylene plastic particles (RPPP) with and without silica fume (SF). The designation of the two different sets of SCHSC containing plastic particles were used on the basis of a constant water–cementitious substance (w/cm) ratio of 0.32 and a total cementitious materials content of 550 kg/m3. The first set of mixtures included binary cementitious blends of 20% fly ash (FA) and 80% Portland cement (PC). However, the second series of the mixtures incorporated ternary cementitious blends of 20% FA, 10% SF and 70% PC. To produce the concretes, medium size aggregate was replaced with RPPP at five designated percentages of 0%, 10%, 20%, 30% and 40% by volume in both sets of concretes. Totally, 10 mixtures were produced and tested for mechanical, fracture and durability properties such as elastic modulus, compressive and splitting tensile strength, flexural strength, sorptivity, chloride ion permeability, gas permeability and fracture energy. The tests were carried out 28 and 90 days after casting. The test results showed that the use of RPPP significantly improved the fracture and ductility properties, whereas aggravated other measured properties of SCHSCs. However, with the addition of SF all mechanical and durability characteristics remarkably enhanced. The results also demonstrated that SCHSC with compressive strength higher than 70 MPa at 90 days was produced by using RPPP content up to 40% replacement level by total medium aggregate volume, and 10% SF.
84 citations
TL;DR: In this article, the effects of silica flour, silica fume (amorphous silica), and a natural zeolite mixture on the hydration of Class H cement slurries at 180°C under externally applied pressures of 7 and 52MPa were examined in real time using in-situ synchrotron X-ray diffraction.
84 citations
TL;DR: In this article, the authors used rock wool waste with a cylindrical size distribution ranging from 17 to 250μm, 30% of which is less than 150μm.
84 citations
TL;DR: In this article, the results of an experimental programme oriented to the manufacturing and characterisation of nanocomposites based on epoxy resin modified with fumed silica nanoparticles (0.1, 0.3 and 0.5 ǫ ) were presented.
Abstract: The paper shows the results of an experimental programme oriented to the manufacturing and characterisation of nanocomposites based on epoxy resin modified with fumed silica nanoparticles (0.1, 0.3 and 0.5 vol.%) with different surface treatments (unmodified, AMEO and GLYMO). The resulting degree of dispersion and the interfacial adhesion were investigated by TEM and SEM. Previous tensile and fracture toughness properties are discussed together with new results on the fatigue behaviour under mode I loading. The fracture toughness K Ic turned out to be significantly increased and a positive trend towards the improvement in the crack propagation threshold under fatigue was observed.
84 citations