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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
TL;DR: In this paper, two metakaolins (MK1 and MK2) were investigated for use as supplementary cementitious materials in cement-based systems, and four series of mortar mixes were made.

128 citations

Journal ArticleDOI
TL;DR: A review of the properties of fresh concrete including workability, heat of hydration, setting time, bleeding, and reactivity by using mineral admixtures fly ash, silica fume, ground granulated blast furnace slag, metakaolin, and rice husk ash is presented.
Abstract: This paper presents a review of the properties of fresh concrete including workability, heat of hydration, setting time, bleeding, and reactivity by using mineral admixtures fly ash (FA), silica fume (SF), ground granulated blast furnace slag (GGBS), metakaolin (MK), and rice husk ash (RHA). Comparison of normal and high-strength concrete in which cement has been partially supplemented by mineral admixture has been considered. It has been concluded that mineral admixtures may be categorized into two groups: chemically active mineral admixtures and microfiller mineral admixtures. Chemically active mineral admixtures decrease workability and setting time of concrete but increase the heat of hydration and reactivity. On the other hand, microfiller mineral admixtures increase workability and setting time of concrete but decrease the heat of hydration and reactivity. In general, small particle size and higher specific surface area of mineral admixture are favourable to produce highly dense and impermeable concrete; however, they cause low workability and demand more water which may be offset by adding effective superplasticizer.

128 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the influence of different parameters, such as the water to cement ratio, the type of cement, the age at loading and the use of fibre reinforcement, on the tensile creep of concrete.

128 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the mixture proportioning of air-entrained self-consolidating concrete (SCC) suitable for filling congested sections, such as in the case of repair of the underside of bridge deck girders and conventional nonrestricted elements.
Abstract: The use of self-consolidating concrete (SCC) can enable the reduction of labor demand for vibration and surface finishing, accelerate placement rate of concrete, and secure superior surface quality. Despite the low yield value required for deformability, SCC is characterized by a moderate viscosity to enhance cohesiveness and stability of the fresh concrete. The air entrainment of SCC for frost durability can reduce viscosity, leading to greater risk of segregation and blockage of concrete flow upon spreading between closely spaced obstacles. This paper investigates the mixture proportioning of air-entrained SCC suitable for filling congested sections, such as in the case of repair of the underside of bridge deck girders and conventional nonrestricted elements. The results of a laboratory study undertaken to optimize and evaluate properties of air-entrained SCC are presented. The mixtures were proportioned with 370 kg/cu m, 450 kg/cu m, and 550 kg/cu m of cementitious materials and water-cementitious material ratios of 0.45 to 0.50. Ternary binders containing 20% Class C fly ash or 40% ground blast-furnace slag with 3% silica fume were used. The mixtures were evaluated for slump flow consistency, restricted deformability and surface settlement, strength development, elastic modulus, temperature rise, shrinkage, permeability, and frost durability. Examples of the use of such concrete for repair of a densely reinforced beam in a parking structure and a moderately reinforced beam-wall element with restricted access in a powerhouse are also discussed. Test results clearly indicate the feasibility of proportioning air-entrained SCC of high stability and resistance to blockage. Optimized mixtures exhibited adequate engineering properties and durability. Field studies demonstrated the effectiveness of such high-performance concrete to repair damaged sections presenting difficulties for placement and consolidation.

127 citations

Journal ArticleDOI
TL;DR: In this article, an experimental program on compressive strength, porosity, electrical resistivity and polarization curves was carried out with the purpose of evaluating the effect of different silica fume (SF) additions (0, 6% and 12%).
Abstract: The addition of silica fume (SF) in concretes has been proposed as a form to improve their performance in resisting concrete reinforcement corrosion. In this study an experimental program on compressive strength, porosity, electrical resistivity and polarization curves was carried out with the purpose of evaluating the effect of different SF additions (0%, 6% and 12%). Concretes with different water–binder ratio (cement + SF) 0.50, 0.65 and 0.80 were used. The results have allowed to show that there are significant improvements of the concrete properties with the SF addition, suggesting its use in aggressive environments.

127 citations


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