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 experimental investigation carried out on high strength concrete reinforced with hybrid fibres up to a volume fraction of 0.5% was carried out for concrete prepared using different hybrid fibre combinations.
Abstract: This paper focuses on the experimental investigation carried out on high strength concrete reinforced with hybrid fibres (combination of hooked steel and a non-metallic fibre) up to a volume fraction of 0.5%. The mechanical properties, namely, compressive strength, split tensile strength, flexural strength and flexural toughness were studied for concrete prepared using different hybrid fibre combinations – steel–polypropylene, steel–polyester and steel–glass. The flexural properties were studied using four point bending tests on beam specimens as per Japanese Concrete Institute (JCI) recommendations. Fibre addition was seen to enhance the pre-peak as well as post-peak region of the load–deflection curve, causing an increase in flexural strength and toughness, respectively. Addition of steel fibres generally contributed towards the energy absorbing mechanism (bridging action) whereas, the non-metallic fibres resulted in delaying the formation of micro-cracks. Compared to other hybrid fibre reinforced concretes, the flexural toughness of steel–polypropylene hybrid fibre concretes was comparable to steel fibre concrete. Increased fibre availability in the hybrid fibre systems (due to the lower densities of non-metallic fibres), in addition to the ability of non-metallic fibres to bridge smaller micro cracks, are suggested as the reasons for the enhancement in mechanical properties.
320 citations
TL;DR: In this paper, a durability-based multi-objective optimization of the mixtures were performed to achieve an optimal concrete mixture proportioning, and the results indicated that when the durability properties of the concretes were taken into account, the ternary use of S and SF provided the best performance.
319 citations
TL;DR: In this paper, the rheological properties of fine particles, such as mineral admixtures (MA), were investigated using a Rotovisco RT 20 rheometer (Haake) with a cylindrical spindle.
319 citations
TL;DR: In this article, the authors investigated the potential use of recycled tire rubbers in cement matrices, which facilitates the development of concrete with a lesser environmental impact and contributes to developing construction in a sustainable way.
318 citations
TL;DR: In this paper, an overview of the nature of the hydration products formed in hardened portland cement-based systems is presented, starting with the most straightforward cementitious calcium silicate systems, C3S and β-C2S, and then considering ordinary portland cements with silica fume, ground granulated iron blast-furnace slag, and finally alkali hydroxide-activated slag cements.
Abstract: An understanding of the performance of portland cement-based materials requires knowledge at the microstructural level. Developments in the instrumentation of several techniques have led to improved understanding of the composition, morphology, and spatial distribution of the various products of cement hydration. In particular, our understanding of the nature of the nearly amorphous calcium silicate hydrate (C–S–H) phases – which are the principal binding phases in all portland cement-based systems – has been advanced by developments in solid-state NMR spectroscopy and analytical TEM. This paper presents an overview of the nature of the hydration products formed in hardened portland cement-based systems. It starts with the most straightforward cementitious calcium silicate systems, C3S and β-C2S, and then considers ordinary portland cement and blends of portland cement with silica fume, ground granulated iron blast-furnace slag, and finally alkali hydroxide-activated slag cements.
316 citations