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 effects of partial replacements of Portland cement by rice-husk ash (RHA) on the autogenous shrinkage were investigated, and two RHAs, both amorphous and partially crystalline, were studied.
Abstract: In this work, the effects of partial replacements of Portland cement by rice-husk ash (RHA) on the autogenous shrinkage were investigated. Pastes with water/binder ratio 0.30 and substitutions of 5% and 10% cement by RHA were tested. Two RHAs, both amorphous and partially crystalline, were studied. Comparisons between pastes with silica fume, and control pastes (without RHA or silica fume) are presented. Autogenous deformations, internal relative humidity and compressive strength were recorded. The RHA, amorphous or partially crystalline, when used in an appropriate way, reduces autogenous shrinkage.
100 citations
TL;DR: In this paper, the effects of binary and ternary combinations of ground granulated blast furnace slag (GGBFS), fly ash (FA) and silica fume (SF) on compressive strength, flexural strength, water sorptivity, permeable voids and drying shrinkage of steam cured alkali-activated cement (AAC) mortars were investigated within the scope of this study.
100 citations
TL;DR: In this paper, an ideal experimental design based on the response surface method (RSM) to develop a new class of Green Ultra-High Performance Fiber Reinforced Cementitious Composites (GUHPFRCCs), in which 50% of the volume contains ultrafine palm oil fuel ash (UPOFA), is presented.
100 citations
TL;DR: In this paper, a collaborative project on cement paste pore solution analysis has been carried out by Institutes in Sweden, Denmark and Austria to determine: (i) the reproducibility of the pore expression method; (ii) the effect of added chlorides on the OH − concentration of OPC pastes from the three countries and (iii) the influence of flyash, slag and silica fume additions on the degree of chloride binding by the cement.
100 citations
TL;DR: In this paper, two possible methods were studied: (i) the design of a complex binder based on Portland cement with polymer and silica fume additions and (ii) surface treatment of the carbon fibres prior to their casting in the cementitious composite.
Abstract: “Continuous fibre wrapping technique” is becoming a common repair and strengthening technique for concrete structures. In this method continuous fibre sheets are bonded to the surface of a concrete structure using organic resins. The main disadvantages of this method are: (i) the use of resins (organic compounds) which are hazardous for the manual worker, and (ii) the low permeability of this type of organic materials. These problems could be solved if a cement-based matrix is used instead of epoxy matrix. In the current development stage one of the limiting parameter in a cementitious carbon fibre composite is the bond between the fibres and the cementitious matrix. The main objective of the study presented in this paper was to improve the bond between the carbon fibres and the cementitious matrix. Two possible methods were studied: (i) the design of a complex binder based on Portland cement with polymer and silica fume additions and (ii) surface treatment of the carbon fibres prior to their casting in the cementitious composite.
100 citations