The Experts below are selected from a list of 4776 Experts worldwide ranked by ideXlab platform
Zhihong Xie - One of the best experts on this subject based on the ideXlab platform.
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compressive and flexural behaviours of a new steel fibre reinforced recycled aggregate concrete with Crumb Rubber
Construction and Building Materials, 2015Co-Authors: Jianhe Xie, Yongchang Guo, Lisha Liu, Zhihong XieAbstract:Abstract Using recycled concrete and Crumb Rubber as aggregates to produce green concrete is a promising technology toward sustainability in the construction industry. In this study, the compressive and flexural behaviours of a new type of concrete material, Rubber Crumb and steel-fibre-reinforced recycled aggregate concrete (RSRAC), are investigated. To popularise the application of this new type of green building material, an experimental study was conducted to investigate the effect of the Rubber content on the compressive and flexural behaviours of RSRAC. A total of 18 cubes (150 mm) and 18 cylinders (150 mm × 200 mm) were tested under axial compressive loading, and 18 prisms of 150 × 150 × 550 mm were tested subjected to three-point bending. The Crumb Rubber content was varied in the investigation at levels of 0%, 4%, 8%, 12% and 16% by volume substitution of sand. Recycled concrete aggregate (RCA) was introduced into the concrete mixture by 100% volume substitution of natural coarse aggregate (NCA), and 1% volumetric quantity of steel fibre was added to the concrete mixture. The effect of the Rubber content on the compressive and flexural strength, failure mode, modulus of elasticity and toughness of RSRAC was analysed. The results indicate that RSRAC with an optimal Rubber content displays good compressive behaviour compared with normal NCA concrete. RSRAC is also a more environmentally friendly alternative to normal Rubber concrete for use in the flexural members of concrete structures.
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compressive behaviour of concrete structures incorporating recycled concrete aggregates Rubber Crumb and reinforced with steel fibre subjected to elevated temperatures
Journal of Cleaner Production, 2014Co-Authors: Y C Guo, Guangming Chen, Jianhong Zhang, Zhihong XieAbstract:Abstract In this paper, effects of elevated temperatures on the compressive behaviour of Rubber Crumb and steel fibre reinforced recycled aggregate concrete (RSRAC) are presented. RSRAC is a new concrete material proposed by the authors. In the RSRAC, steel fibre is used to improve the performances of concrete before exposure (e.g. ductility, cracking) and after exposure (explosive spalling) to evaluated temperature, and the inclusion of Rubber particles is mainly for the consideration of environment protection and reducing the risk of spalling after exposure to high temperatures. A series of concrete mixes were prepared with Ordinary Portland Cement (OPC), recycled concrete coarse aggregates (RCA) or natural coarse aggregates (NCA), 1% steel fibre (by volume) and Rubber particles with different fine aggregate (sand) replacement ratios. The compressive properties, including compressive strength, Young's modulus (stiffness), stress–strain curves and energy absorption capacity (toughness) of the different concrete mixes subjected to elevated temperatures (25 °C, 200 °C, 400 °C and 600 °C), were obtained in accordance to ASTM standards. The results of weight loss and failure modes were recorded and presented in this study. The results showed that both the compressive strength and stiffness of concrete mixes decreased after exposure to elevated temperature, with higher replacement of fine aggregate by Rubber leading to lower compressive strength and stiffness magnitude. Nevertheless, Rubber Crumbs significantly enhanced the energy absorption capacity and explosive spalling resistance.
Franco Cataldo - One of the best experts on this subject based on the ideXlab platform.
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the role of carbon nanostructures in the ozonization of different carbon black grades together with graphite and Rubber Crumb in an ir gas cell
Fullerenes Nanotubes and Carbon Nanostructures, 2007Co-Authors: Franco Cataldo, Ornella UrsiniAbstract:Abstract Four carbon black grades (namely N234, N375, N660, and N991) having surface area of 120, 90, 36, and 8 m2/g have been studied together with a micronized synthetic graphite and a Rubber Crumb in their reaction with ozone. The study was conducted at room temperature in heterogeneous and static conditions inside an infrared gas cell. Using gas‐phase infrared spectroscopy it has been followed the evolution of CO2 formed by the O3 attack directed toward the carbon surface and the consumption of ozone admitted into the cell using the ozone absorption band at 1056 cm−1. The pseudofirst kinetic rate constant k derived from the ozone consumption in presence of carbon materials was determined for all the carbon materials studied. The reaction between ozone and carbon blacks essentially involves two stages: the gasification of the surface to CO2 and its functionalization with oxygenated chemical groups, mainly under the form of COOH but also many other groups. The pseudofirst order kinetics appears adequate...
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preparation of pyrolytic carbon black from scrap tire Rubber Crumb and evaluation in new Rubber compounds
Macromolecular Materials and Engineering, 2005Co-Authors: Franco CataldoAbstract:Summary: Pyrolytic carbon black (CBp) has been prepared by Rubber Crumb pyrolysis under nitrogen flow at 700 °C. The CBp obtained by this process had an average surface area of 81 m2 · g−1 and was obtained in 43% yield over the starting Rubber Crumb. Although the CBp surface area can be increased up to 109 m2 · g−1 by washing away the Zn- and Si-based ashes with HF treatment, the CBp was tested in a standard NR/SBR-based formulation without any purification and ash extraction. CBp was tested at increasing loading levels as partial or full replacement of a standard N339 furnace carbon black. CBp depresses the physical properties of the Rubber compound in a way which is directly proportional to the amount added. The reason of this result and the limited reinforcing effect is discussed in terms of low surface area and low structure in comparison to N339 carbon black as well as in terms of low surface activity, the interference of the ashes and the poor dispersion. Ideas of further development works are outlined.
Y C Guo - One of the best experts on this subject based on the ideXlab platform.
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compressive behaviour of concrete structures incorporating recycled concrete aggregates Rubber Crumb and reinforced with steel fibre subjected to elevated temperatures
Journal of Cleaner Production, 2014Co-Authors: Y C Guo, Guangming Chen, Jianhong Zhang, Zhihong XieAbstract:Abstract In this paper, effects of elevated temperatures on the compressive behaviour of Rubber Crumb and steel fibre reinforced recycled aggregate concrete (RSRAC) are presented. RSRAC is a new concrete material proposed by the authors. In the RSRAC, steel fibre is used to improve the performances of concrete before exposure (e.g. ductility, cracking) and after exposure (explosive spalling) to evaluated temperature, and the inclusion of Rubber particles is mainly for the consideration of environment protection and reducing the risk of spalling after exposure to high temperatures. A series of concrete mixes were prepared with Ordinary Portland Cement (OPC), recycled concrete coarse aggregates (RCA) or natural coarse aggregates (NCA), 1% steel fibre (by volume) and Rubber particles with different fine aggregate (sand) replacement ratios. The compressive properties, including compressive strength, Young's modulus (stiffness), stress–strain curves and energy absorption capacity (toughness) of the different concrete mixes subjected to elevated temperatures (25 °C, 200 °C, 400 °C and 600 °C), were obtained in accordance to ASTM standards. The results of weight loss and failure modes were recorded and presented in this study. The results showed that both the compressive strength and stiffness of concrete mixes decreased after exposure to elevated temperature, with higher replacement of fine aggregate by Rubber leading to lower compressive strength and stiffness magnitude. Nevertheless, Rubber Crumbs significantly enhanced the energy absorption capacity and explosive spalling resistance.
Laszlo Cseteneyi - One of the best experts on this subject based on the ideXlab platform.
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strength abrasion and permeation characteristics of cement concrete containing discarded Rubber fine aggregates
Construction and Building Materials, 2014Co-Authors: Blessen Skariah Thomas, Ramesh Chandra Gupta, Pawan Kalla, Laszlo CseteneyiAbstract:Abstract Solid waste disposal is a worldwide problem. If not properly disposed, these materials become sources of environmental pollution and the problems related to it. Various studies are done worldwide to dispose these solid waste materials by using them for partial or complete replacement of aggregates in cement concrete. Discarded tyre Rubber is an important solid waste material that destroys the ecological environment. This paper investigates the suitability of waste tyre Rubber in cement concrete as a partial replacement for natural river sand. M30 grade of concrete is designed as per IS 10262: 2010, with water/cement ratios of 0.4. Water–cement ratios of 0.45 and 0.5 were also studied. 0–20% substitution of fine aggregates, in multiples of 2.5% was done with discarded tyre Rubber (Crumb Rubber). The specimens with 0% discarded tyre Rubber were taken as control mix. Tests were done to determine the compressive strength, flexural strength, abrasion resistance, micro-structure, water permeability, and Sorptivity in concrete specimens. It was observed that discarded tyre Rubber may be utilized for the partial replacement for natural fine aggregates up to 7.5% without enough reduction in its desired strength.
L A Clark - One of the best experts on this subject based on the ideXlab platform.
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cement based materials containing shredded scrap truck tyre Rubber
Construction and Building Materials, 1996Co-Authors: N I Fattuhi, L A ClarkAbstract:Cement paste, mortar, and concrete (containing opc or opc and pfa) mixes were prepared using various proportions of either Rubber Crumb or low-grade Rubber obtained from shredding scrap tyres. Properties examined for the 32 mixes prepared included density, compressive strength, impact and fire resistances, and nailability. Results showed that density and compressive strength of various mixes were reduced by the addition of Rubber. (Rubber type had only marginal effect.) Density varied between about 1300 and 2300 kg/m3. Compressive strength reduced by 70% when the proportion of Rubber to total solid content by mass of concrete reached about 13%.
