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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01 Jan 1993
TL;DR: In this article, the authors examined the microstructural characteristics of the interfacial region around aggregate particles in concrete and explored the influence of this interfacial zone on some of the properties of concrete such as the compressive strength, the water transport capacity, and the diffusion of ions into concretes prepared with and without mineral additives.
Abstract: This is a report of a study that examined the microstructural characteristics of the interfacial region around aggregate particles in concrete. The study also explored the influence of this interfacial zone on some of the properties of concrete such as the compressive strength, the water transport capacity, and the diffusion of ions into concretes prepared with and without mineral additives. The literature review is described, as well as the materials and the experimental methods. The micro-characteristics of the interfacial zone in portland cement mortars and concrete are described, as well as the effects of the interfacial zone on diffusion of ions in concrete. The effects of mineral additives on the cement paste-aggregate interfacial zone in concrete, and the influence of pozzolans on the interfacial zone in relationship to the transport of water and the diffusion of ions in concrete are covered. The study also covered the effects of silica fume and metakaolinite on the interfacial zone with respect to the strength of mortars.
72 citations
TL;DR: In this paper, the authors provide a comprehensive discussion upon the utilization of the reviewed materials, as well as the challenges and the knowledge gaps in producing green and sustainable concrete, highlighting advanced approaches with an emphasis on sustainability, which include the enhancement of the hydration process in cement, and the development of new materials that can be used in concrete (e.g., carbon nanotube).
Abstract: The popularity of concrete has been accompanied with dreadful consumptions that have led to huge carbon footprint in our environment. The exhaustion of natural resources is not yet the problem, but also the energy that is needed for the fabrication of the natural materials, in which this process releases significant amount of carbon dioxide (CO2) emissions into the air. Ordinary Portland Cement (OPC) and natural aggregates, which are the key constituents of concrete, are suggested to be recycled or substituted in order to address the sustainability concern. Here, by-products have been targeted to reduce the carbon footprint, including, but not limited to, fly ash, rice husk ash, silica fume, recycled coarse aggregates, ground granular blast-furnace slag, waste glass, and plastic. Moreover, advanced approaches with an emphasis on sustainability are highlighted, which include the enhancement of the hydration process in cement (calcium-silicate hydrate) and the development of new materials that can be used in concrete (e.g., carbon nanotube). This review paper provides a comprehensive discussion upon the utilization of the reviewed materials, as well as the challenges and the knowledge gaps in producing green and sustainable concrete.
72 citations
TL;DR: In this article, the compressive strength of and chloride diffusivity in mortar and concrete samples with cement partially replaced by various minerals (class F and class N fly ash, ultra-fine fly ash and silica fume, metakaolin, and ground granulated blast-furnace slag), the porosity of mineral concretes, the freeze-thaw resistance of mineral mortars in the presence of deicers, and the effect of supplementary cementitious materials on the chloride binding and chemistry of pore solution in mortar.
72 citations
TL;DR: In this article, the effect of graphene oxide (GO) on microstructure and strengthened properties of fly ash and silica fume based cement composites, by determining the characteristics of cement composite through mechanical and micro structural studies (SEM and XRD analysis).
71 citations
TL;DR: In this article, the properties of pervious concrete with different levels of recycled concrete aggregate were presented in the context of porous concrete and the effect of aggregate size on the properties were studied.
71 citations