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 impact of two grades of calcined clay on the hydration and microstructural development of UHPFRC matrices was investigated, where 54% of the cement by volume has already been replaced by a limestone with similar PSD.
112 citations
TL;DR: In this article, the main performance properties of 50 concrete mixes designed with binary, ternary and quaternary cementitious systems, including the use of various proportions of slag (S), fly ash (FA), limestone (LS), silica fume (SF), and metakaolin (MK) as a partial replacement by weight of Portland cement (PC) manufacturing.
112 citations
TL;DR: In this paper, the 56-day pore structures of the cement mortars produced by the addition of silica fume and nano-SiO2 (NS), nano-Al2O3 (NA), and nanoFe2 O3 (NF) powders in singular, binary or ternary combinations at 3 different proportions (0.5, 1.25, and 2.5%) of the binder content were investigated through MIP and BET analyses.
112 citations
TL;DR: In this article, a cyclic ponding regime with 0.55 M sodium chloride solution was used to measure the changes in resistance between pairs of stainless steel electrodes embedded in the concrete at different depths from the exposed surface.
Abstract: Chloride ion penetration into concrete and the resulting deterioration (cracking and spalling due to the corrosion of reinforcement) is a major concern of engineers and owners of bridges and marine structures. Several publications have reported the excellent performance of concrete containing alternative cementitious materials (ACMs), such as pulverised fuel ash (PFA), ground granulated blast furnace slag (GGBS), microsilica (MS) and metakaolin (MK) in marine environment and highway structures. The resistance offered by these concretes has been related to the low mobility of chloride ions due to either the reduction in the number of interconnected pores as a result of the pozzolanic reaction of the ACMs or the chemical binding with the cement hydrates. However, the secondary reaction products are formed slowly in Portland cement concrete containing ACMs and as a result it is likely that the resistance offered to the penetration of chloride ions also increases slowly with time. In order to monitor the continuous behaviour of concretes containing these ACMs in a chloride exposure regime, an investigation was carried out, the results of which are reported in this paper. Ten different concrete mixes were subjected to a cyclic ponding regime with 0.55 M sodium chloride solution and the changes in concrete were monitored by measuring the changes in resistance between pairs of stainless steel electrodes embedded in the concrete at different depths from the exposed surface. The test was continued for nearly one year. The results indicated that, although the resistance of concrete decreased initially due to the penetration of chlorides, in the longer term the resistance of concretes containing ACMs outperformed the control concrete made with ordinary Portland cement (OPC). Drilled dust samples extracted after different durations of ponding were tested for the chloride content, which confirmed that the increase in resistance of the ACMs was due to the combined effects of the reduction in the penetration of chlorides and the continuous hydration activity of the ACMs.
112 citations
TL;DR: In this article, the filling role of pozzolanic material was analyzed and the influence of this material on fluidity and strength of cement was also investigated, showing that the fine material can increase the packing density and reduce the amount of water in surface layer and decrease the filling water.
112 citations