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 authors investigated the internal stress development induced during the development of autogenous shrinkage strains, especially at early-age, on three different types of HPC cured with a combination of two shrinkage-compensating admixtures.
131 citations
TL;DR: In this article, the authors evaluate the influence of commercial densified silica fume (SF) and of recycled concrete aggregates (RA) on the behavior of high performance concrete (HPC).
131 citations
TL;DR: In this article, the effect of silica fume content, ranging from 0 to 25%, by mass of cementitious materials, on rheological, fiber-matrix bond, and mechanical properties of non-fibrous UHPC matrix and uHPC made with 2% micro-steel fibers was investigated.
131 citations
TL;DR: In this article, the microstructure of hardened pastes of C3S and a C 3S/silica fume blend have been examined by transmission electron microscopy before and after partial carbonation in pure CO2 at a relative humidity of 72·6%.
Abstract: The microstructure of hardened pastes of C3S and a C3S/silica fume blend have been examined by transmission electron microscopy before and after partial carbonation in pure CO2 at a relative humidity of 72·6%. Fibrillar outer product C-S-H and the outer regions of inner product C-S-H gel carbonate without change of morphology to silica gel. Calcium carbonate is formed mainly in outer product regions as microcrystalline vaterite or calcite. Residual CH embedded in vaterite microcrystals is observed in the carbonated C3S pastes. It is proposed that outer product C-S-H and CH surfaces carbonate relatively rapidly, compared with inner regions of CH or the inner regions of inner product C-S-H, leading to a substantial level of carbonation of thin slices (0·4 mm) of paste within one day, with little further carbonation in the next few days. The implications for the theory of the kinetics of cement paste carbonation are discussed.
130 citations
TL;DR: In this paper, the influence of two mineral admixtures, silica fume (SF) and high-reactivity metakaolin (HRM), on the chemistry of alkali-silica reaction (ASR) products was investigated.
Abstract: This investigation studies the influence of two mineral admixtures, silica fume (SF) and high-reactivity metakaolin (HRM), on the chemistry of alkali–silica reaction (ASR) products Four different mortar bar mixes containing different combinations of high-alkali cement, alkali–inert dolomitic limestone, reactive Beltane opal, HRM, and SF were prepared and stored in a 1 N NaOH solution at 80°C (ASTM C 1260) for 21 days Expansion of bar specimens was measured, and chemical analysis was performed at different ages using X-ray spectra and maps Test results confirmed that HRM and SF significantly reduce expansion due to ASR In addition, X-ray microanalysis showed that calcium content increases with time in ASR products Furthermore, it was found that as ASR proceeded the calcium content of reaction products increased proportionally as the silica content decreased
130 citations