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, simple equations are developed to estimate the replacement level needed to ensure adequate water for complete curing of the concrete, and a three-dimensional concrete microstructural model is applied to determine the fraction of the cement paste within a given distance from the lightweight aggregate surfaces.
369 citations
TL;DR: In this paper, the hydration progress in metakaolin-blended high-performance cement pastes with age was assessed from the measurements of compressive strength, porosity, and pore size distribution, the degree of pozzolanic reaction, and the Ca(OH)2(CH) content of the MK-blending pastes at a water-to-binder ratio of 0.3.
366 citations
TL;DR: In this paper, the microstructure of recycled aggregate prepared from the crushing of old concrete was studied and an increase of ~30 and 15% in compressive strength at ages 7 and 28 days was observed after the silica fume treatment.
Abstract: The microstructure of recycled aggregate prepared from the crushing of old concrete was studied. It was found that the recycled aggregate is covered with loose particles that may prevent good bonding between the new cement matrix and the recycled aggregate. The old cement paste that remained on the natural aggregate was porous and cracked, leading to weak mechanical properties of the recycled aggregate. Treatment of the recycled aggregate by impregnation of silica fume solution and by ultrasonic cleaning was studied with the objective of overcoming the above-mentioned limitations. An increase of ~30 and ~15% in the compressive strength at ages 7 and 28 days was observed after the silica fume treatment. Ultrasonic treatment led to an improvement of ~7%.
366 citations
TL;DR: In this paper, the concept of an efficiency factor is applied as a measure of the relative performance of supplementary cementing materials (SCM) compared with Portland cement, and a mix design strategy to fulfil any requirements for concrete strength and service lifetime was developed and it enables concrete performance to be accurately predicted.
362 citations
TL;DR: In this paper, the effects of pozzolan made from various byproduct materials on mechanical properties of high-strength concrete were investigated and the results suggest that concretes containing FA, FB, RHBA, and POFA can be used as pozzolic materials in making high strength concrete with 28-day compressive strengths higher than 80 MPa.
359 citations