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 reaction of colloidal silica fumes with calcium hydroxide or hydrating tricalcium silicate (C3S) has been studied using calorimetry, chemical analyses, and scanning electron microscopy.
Abstract: Reactions of colloidal silica fumes with calcium hydroxide or hydrating tricalcium silicate (C3S) have been studied using calorimetry, chemical analyses, and scanning electron microscopy. Silica fume reacts immediately with calcium hydroxide forming a colloidal calcium silicate hydrate (C-S-H) similar to that formed by the hydration of C3S. When excess silica is present it reacts with C-S-H already formed to produce a new, highly polymerized C-S-H, having a very low C/S ratio (1.0). Silica fume accelerates the hydration of C3S, reduces the amount of calcium hydroxide formed by reacting with it, and slightly lowers the C-S-H ratio of the C-S-H formed by hydration. When large amounts of silica fume are present the formation of calcium hydroxide may be entirely suppressed and a highly polymerized C-S-H is formed. Silica fume is considered a good model for reactive pozzolans used in concrete.
113 citations
TL;DR: In this paper, the effects of partial portland cement replacement with various supplementary cementitious materials were investigated for the degradation of kraft pulp fiber-cement composite mechanical properties (i.e., strength and toughness) during wet/dry cycling.
113 citations
TL;DR: In this paper, the effect of different additives on the strength foamed concrete by characterising air-void size and shape parameters and identifying the influence of these parameters and changes to cement paste microstructure on strength was investigated.
112 citations
TL;DR: In this paper, the role of 0-2mm fine aggregate on the compressive and splitting tensile strengths of recycled concrete aggregate (RCA) concrete with normal and high strengths was investigated.
112 citations
TL;DR: The results show that the use of LS degrades the microstructure of UHPC at early ages, and however, theUse of LS with the appropriate content improves microst structure of UhPC at later ages.
112 citations