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 characteristics of the pozzolanic reactivity of nanoSiO2 from studies of its reaction kinetics, morphology and structure of the hydrates and the influences of these features on the properties of cement-based materials were explored.
Abstract: The aim of this work is to understand the characteristics of the pozzolanic reactivity of nanoSiO2 from studies of its pozzolanic reaction kinetics, morphology and structure of the hydrates and the influences of these features on the properties of cement-based materials, so as to explore a more targeted way of using nanoSiO2 in cement or concrete. It revealed that the pozzolanic reaction of nanoSiO2 is of the first-order and the apparent reaction rate constant of nanoSiO2-4 nm is about one order of magnitude bigger than that of silica fume, but the specific reaction rate constant is about one half to that of silica fume. A compacter gel structure and poorer crystallinity of the hydrates of nanoSiO2 to those of silica fume are found, as well. The rate of hydration of cement at very early ages is enhanced by nanoSiO2, but the rate slows down with aging due to the compact gel structure. To make the use of the high pozzolanic reactivity and ultrafine particle size of nanoSiO2, as well as its resulting compact gel structure, colloidal nanoSiO2 was applied onto the hardened cement mortar by brushing technique and a less permeable surface was resulted, which shows the potential of using nanoSiO2 as a surface treatment material for cement-based materials.
156 citations
TL;DR: It is demonstrated that the industrial waste products including GBFS and SF can be suitably used as mineral additives to improve the long-term mechanical performance of CPB produced from sulphide-rich tailings as well as to reduce the binder costs in a CPB plant.
156 citations
TL;DR: In this paper, a study aimed at controlling plastic shrinkage cracks in high strength silica fume concrete by means of adding fibre reinforcement up to 05% by volume of concrete, individual steel fibres as well as hybrid combinations of steel and non-metallic (polyester, polypropylene and glass) fibres were evaluated for their influence on plastic shrinkages.
Abstract: High strength concrete using silica fume is prone to plastic shrinkage cracking in dry and windy conditions Addition of fibres is known to restrict the growth of shrinkage cracks The present study was aimed at controlling plastic shrinkage cracks in high strength silica fume concrete by means of adding fibre reinforcement up to 05% by volume of concrete Individual steel fibres as well as hybrid combinations of steel and non-metallic (polyester, polypropylene and glass) fibres were evaluated for their influence on plastic shrinkage cracking Results showed that hybrid fibres were most effective in reducing shrinkage cracks Among the hybrid fibre combinations, the steel and polyester combination was found to reduce plastic shrinkage cracks by more than 99% compared to the plain concrete Increased fibre availability and low stress levels at early ages were the main factors contributing to the good performance of hybrid fibre mixtures
156 citations
TL;DR: In this paper, an experimental study was conducted aiming to replace silica fume (SF) by another fine supplementary cementitious materials (SCMs), such as fly ash (FA) or ground granulated blast furnace slag (GGBS), in order to reduce the amount of autogenous shrinkage.
156 citations
154 citations