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 use of short pitch-based carbon fibres (0.5% by weight of cement, 0.189 volume % (vol%) of concrete), together with a dispersant, chemical agents and silica fume, in concrete with fine and coarse aggregates, resulted in a flexural strength increase of 85%, flexural toughness increase of 205, a compressive strength increase, and a material price increase of 39%.
153 citations
TL;DR: In this article, the effects of rice husk ash (RHA) on strength and permeability of ultra-high performance concrete (UHPC) were investigated, and the results showed that the addition of RHA to replace SF decreases the fluidity of fresh UHPC mixture and entraps more air bubbles.
153 citations
TL;DR: It is reported here, for the first time in the literature, a method to synthesize hydrophobic and superhydrophobic concrete, which has much longer durability then regular concretes and can have a broad range of applications in civil and materials engineering.
Abstract: We report here, for the first time in the literature, a method to synthesize hydrophobic and superhydrophobic concrete. Concrete is normally a hydrophilic material, which significantly reduces the durability of concrete structures and pavements. To synthesize water-repellent concrete, hydrophobic emulsions were fabricated and applied on portland cement mortar tiles. The emulsion was enriched with the polymethyl-hydrogen siloxane oil hydrophobic agent as well as metakaolin (MK) or silica fume (SF) to induce the microroughness and polyvinyl alcohol (PVA) fibers to create hierarchical surfaces. Various emulsion types were investigated by using different mixing procedures, and single- and double-layer hydrophobic coatings were applied. The emulsions and coatings were characterized with optical microscope and scanning electron microscope (SEM), and their wetting properties, including the water contact angle (CA) and roll-off angle, were measured. A theoretical model for coated and non-coated concrete, which ca...
152 citations
TL;DR: In this article, the authors examined the influence of aggregate type on the strength characteristics and abrasion resistance of high strength silica fume concrete and found that gabbro concrete showed the highest compressive and flexural tensile strength and ab rasion resistance.
Abstract: This paper examines the influence of aggregate type on the strength characteristics and abrasion resistance of high strength silica fume concrete. Five different aggregate types (gabbro, basalt, quartsite, limestone and sandstone) were used to produce high strength concrete containing silica fume. Silica fume replacement ratio with cement was 15% on a mass basis. Water-binder ratio was 0.35. The amount of hyperplasticizer was 4% of the binder content by mass. Gabbro concrete showed the highest compressive and flexural tensile strength and abrasion resistance, while sandstone showed the lowest compressive and flexural tensile strength and abrasion resistance. High abrasion resistant aggregate produced a concrete with high abrasion resistance. Three-month compressive strengths of concretes made with basalt, limestone and sandstone were found to be equivalent to the uniaxial compressive strengths of their aggregate rocks. However, the concretes made with quartsite and gabbro aggregate showed lower compressive strength than the uniaxial compressive strength of their aggregate rocks.
152 citations
TL;DR: In this paper, the influence of water/binder ratio and the replacement percentage of FC3R on the pozzolanic reaction were investigated by means of thermogravimetry (TG) of cured FC 3R-Portland cement pastes.
151 citations