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 paper, the microstructure development of cement-silica fume blends is very different from plain cement, and the Ca/Si ratio in the inner product (IP) C-S-H decreases as CH is consumed to reach Ca ≈ 1.40-1.50 at the point when CH has disappeared, and then drops down to 1.00 in absence of CH.
175 citations
TL;DR: In this article, the effect of using electric arc furnace (EAF) steel slag as coarse aggregate in concrete properties of fresh and hardened concrete were evaluated for five concrete mixtures with different grades (30, 50 and 70 MPa).
175 citations
TL;DR: In this paper, an attempt to use nano SiO2 (NS) and silica fume (SF) modifying cement mortar as a surface protection material (SPM) was made, in order to promote penetration resistance of the whole system.
Abstract: In corrosion environment, corrosion ions can easily penetrate from the surface into the inside of the concrete due to the porous structure of the surface; in this case, concrete can inevitably suffer from the damage. In this study, an attempt to use nano SiO2 (NS) and silica fume (SF) modifying cement mortar as a Surface Protection Material (SPM) was made, in order to promote penetration resistance of the whole system. SPM was coated on the surface of matrix, and then interfacial bond strength between matrix and SPM was measured; shrinkage consistency was also considered; the chloride penetrability of the system was examined as well. To reveal the mechanism, effect of NS and SF on pore structure, Interfacial Transition Zone (ITZ), hydration process, and compressive strength of SPM were investigated. The results show that matrix coated with SPM on the surface has a good integrity, with excellent interfacial bond strength and little difference in shrinkage, and chloride diffusion coefficient of the system was considerably declined, in comparison with the matrix, showing an excellent penetration resistance. The mechanism behind is that SPM, which was modified with SF-NS, shows the excellent impermeability, and this kind of material existing on the surface can noticeably obstruct the chloride ions penetrating into the inside. In cement hydration process, SF and NS can not only consume a large amount of CH to form dense C-S-H, but also exert the grading filling effect, resulting in the decline in porosity, the increase in density, the improvement in microstructure of ITZ, and the enhancement in mechanical performance. The findings can provide useful experience for the design of the cement-based materials servicing in high corrosion environment.
174 citations
TL;DR: In this paper, the effects of cyclic wetting and drying with sodium chloride solution on chloride ingress into concrete were examined and a good relationship exists between the depth of chloride penetration and the square root of the number of cycles.
173 citations
TL;DR: In this paper, the effect of substitution with fly ash, silica fume and metakaolin on the compressive strength, dynamic elastic modulus, chloride-ion penetration, water absorption, water sorptivity, and freeze-thaw and sulfate resistance of the mortar mixtures were comparatively investigated.
171 citations