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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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Journal ArticleDOI
Sidney Diamond1
TL;DR: In this paper, the authors provided an exposition of several special chemically-related areas of ASR that have been actively investigated in the past few years, and indicated that some treatments may induce long-term retention of sulfate ions in the pore solution, posing a risk for possible delayed ettringite formation.
Abstract: This paper provides an exposition of several special chemically-related areas of ASR that have been actively investigated in the past few years. It was found that: (a) the addition of alkali hydroxide to cement to simulate cement of higher alkali contents in laboratory studies has unexpected consequences that may jeopardize the validity of interpretations made; (b) partial drying of concrete may cause practically irreversible fixation of the alkali hydroxide in the pore solution, an effect which would appear to render further ASR problematical for a long time, even if the concrete is wetted again; (c) silica fume with coarse particles or undispersed agglomerates can induce, rather than prevent ASR distress in certain instances; and (d) lithium-based treatments for ASR commonly result in lithium being retained in the pore solution as lithium hydroxide; the addition to hydroxide concentration over that produced by cement alkalis may pose an augmented challenge to any reactive aggregates in the concrete. It was also indicated that some treatments may induce long-term retention of sulfate ions in the pore solution, posing a risk for possible delayed ettringite formation.

61 citations

Journal ArticleDOI
TL;DR: In this article, a cross-mixture design of Portland cement, waste glass and silica fume was used to optimize the mechanical properties of mortars in which waste glass is employed as a partial substitution of cement.

61 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the effect of micro-silica microparticles, volume fraction of sisal and maleic anhydride on the mechanical properties of polymeric composites reinforced with unidirectional sisal natural fibres.
Abstract: Polymeric composites reinforced with natural fibres have been developed in recent years, showing significant potential for various engineering applications due to their intrinsic sustainability, low cost, low weight and mechanical strength. The interfacial adhesion between natural fibres and polymeric matrices is critical to the composite performance. In order to improve the physical adhesion of polymeric composites, micro and nanoparticles have been added to synthetic fibres in the past. This work investigates the effect of silica microparticles, volume fraction of sisal and maleic anhydride on the mechanical properties of polymeric composites reinforced with unidirectional sisal natural fibres. A full factorial design (2231) was carried out to identify the effect of these factors on the responses: bulk density, apparent density, apparent porosity, water absorption, mechanical strength and modulus of elasticity. A microstructure analyses was conducted to verify the interface condition. The volume fraction of fibres, silica addition, and the interaction between silica particles and maleic anhydride additions exhibited significant effects on the tensile strength and modulus of elasticity of the composites. The microsilica addition did not affect significantly the flexural strength; while the interaction between fraction of fibres, silica particles and maleic anhydride addition played a major role not only on the flexural strength, but also on the flexural modulus. The volume fraction of sisal fibres exhibited significant effects on the bulk density, apparent density, apparent porosity and water absorption of the composites.

61 citations

Journal ArticleDOI
TL;DR: In this paper, a comparison between the influence of active and inert fine particles on the heat of hydration and the development of compressive strength of blended mortars is made. But the results concern the inert filler and the hydraulic or pozzolanic microfillers, or both.
Abstract: This paper focuses on the comparison between the influence of active and inert fine particles on the heat of hydration and the development of compressive strength of blended mortars. The activity of the mineral additives is assessed by measuring the heat of hydration of the different blended mortars that consist of 90% portland cement and 10% admixture with a 0.45 water-binder ratio. In the early stages, the fine particles accelerate the hydration rate by providing an increased number of nuclei sites for hydrates growth. These results concern the inert filler and the hydraulic or pozzolanic microfillers, or both. At very early stages, the finest particles increase the compressive strength of blended mortars compared with control mortar. Moreover, silica powders, especially silica fume, develop a pozzolanic activity that later increases the compressive strength.

61 citations

Journal ArticleDOI
TL;DR: In this article, the feasibility of using combination of Cement Kiln Dust (CKD) which is classified as a hazardous solid waste material and Silica Fume (SF), as a sustainable precursor to make binary binder based geopolymer paste was investigated.

61 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
2023485
2022944
2021621
2020726
2019779