The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform
Marcos Vinicio Costa Agnesini - One of the best experts on this subject based on the ideXlab platform.
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durability of polymer modified lightweight aggregate Concrete
Cement & Concrete Composites, 2004Co-Authors: Joao Adriano Rossignolo, Marcos Vinicio Costa AgnesiniAbstract:The effects of styrene-butadiene rubber latex (SBR) modification on the durability of lightweight Concrete (LWAC) were investigated. Corrosion resistance, chemical resistance and water absorption of SBR-modified LWAC were analyzed and compared with the unmodified LWAC. The 7-day compressive strength as well as the dry Concrete Density varied from 39.5 to 51.9 MPa and from 1460 to 1605 kg/m3, respectively. The results of this study demonstrate that the performance of SBR-modified LWAC exposed to aggressive environments was better than unmodified one. SBR-modified LWAC led to lower water absorption and significant resistance improvement to chemical attack and corrosion. (A) "Reprinted with permission from Elsevier".
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mechanical properties of polymer modified lightweight aggregate Concrete
Cement and Concrete Research, 2002Co-Authors: Joao Adriano Rossignolo, Marcos Vinicio Costa AgnesiniAbstract:Abstract This paper deals with the properties of styrene–butadiene rubber (SBR)-modified lightweight aggregate Concretes (LWACs) for thin precast components, made with two Brazilian lightweight aggregates (LWAs). Properties in the fresh state, compressive strength, splitting tensile strength, flexural strength, and water absorption of LWACs were tested. The 7-day compressive strength and the dry Concrete Density vary from 39.7 to 51.9 MPa and from 1460 to 1605 kg/m3, respectively. The inclusion of SBR latex in LWACs decreases the water–(cement+silica fume) [W/(C+S)] ratio and water absorption and increases the splitting tensile and flexural strengths. The results of this pilot study suggest that there are possibilities of producing thin precast components using SBR-modified LWACs with Brazilian LWAs.
Joao Adriano Rossignolo - One of the best experts on this subject based on the ideXlab platform.
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durability of polymer modified lightweight aggregate Concrete
Cement & Concrete Composites, 2004Co-Authors: Joao Adriano Rossignolo, Marcos Vinicio Costa AgnesiniAbstract:The effects of styrene-butadiene rubber latex (SBR) modification on the durability of lightweight Concrete (LWAC) were investigated. Corrosion resistance, chemical resistance and water absorption of SBR-modified LWAC were analyzed and compared with the unmodified LWAC. The 7-day compressive strength as well as the dry Concrete Density varied from 39.5 to 51.9 MPa and from 1460 to 1605 kg/m3, respectively. The results of this study demonstrate that the performance of SBR-modified LWAC exposed to aggressive environments was better than unmodified one. SBR-modified LWAC led to lower water absorption and significant resistance improvement to chemical attack and corrosion. (A) "Reprinted with permission from Elsevier".
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mechanical properties of polymer modified lightweight aggregate Concrete
Cement and Concrete Research, 2002Co-Authors: Joao Adriano Rossignolo, Marcos Vinicio Costa AgnesiniAbstract:Abstract This paper deals with the properties of styrene–butadiene rubber (SBR)-modified lightweight aggregate Concretes (LWACs) for thin precast components, made with two Brazilian lightweight aggregates (LWAs). Properties in the fresh state, compressive strength, splitting tensile strength, flexural strength, and water absorption of LWACs were tested. The 7-day compressive strength and the dry Concrete Density vary from 39.7 to 51.9 MPa and from 1460 to 1605 kg/m3, respectively. The inclusion of SBR latex in LWACs decreases the water–(cement+silica fume) [W/(C+S)] ratio and water absorption and increases the splitting tensile and flexural strengths. The results of this pilot study suggest that there are possibilities of producing thin precast components using SBR-modified LWACs with Brazilian LWAs.
Ea Hwang - One of the best experts on this subject based on the ideXlab platform.
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utilization of power plant bottom ash as aggregates in fiber reinforced cellular Concrete
Waste Management, 2010Co-Authors: Ea HwangAbstract:Recently, millions tons of bottom ash wastes from thermoelectric power plants have been disposed of in landfills and coastal areas, regardless of its recycling possibility in construction fields. Fiber-reinforced cellular Concrete (FRCC) of low Density and of high strength may be attainable through the addition of bottom ash due to its relatively high strength. This paper focuses on evaluating the feasibility of utilizing bottom ash of thermoelectric power plant wastes as aggregates in FRCC. The flow characteristics of cement mortar with bottom ash aggregates and the effect of aggregate type and size on Concrete Density and compressive strength were investigated. In addition, the effects of adding steel and polypropylene fibers for improving the strength of Concrete were also investigated. The results from this study suggest that bottom ash can be applied as a construction material which may not only improve the compressive strength of FRCC significantly but also reduce problems related to bottom ash waste.
Charles G Clifto - One of the best experts on this subject based on the ideXlab platform.
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effectiveness of foamed Concrete Density and locking patterns on bond strength of galvanized strip
Construction and Building Materials, 2016Co-Authors: Ali A Sayadi, Jua T Vilches, Thomas Neitze, Charles G CliftoAbstract:Abstract Density and compressive strength of foamed Concrete as an infill material and configuration of embedded components of composite structural assemblies (CSAs) and their interaction significantly affects performance of composite panels when subjected to external loading. This paper aims to investigate the effectiveness of parameters such as Density, compressive strength and locking area on bond strength of embedded components of composite panels. In order to evaluate these parameters, foamed Concrete with densities ranging from 800 kg/m 3 to 1200 kg/m 3 were prepared and ten forms of locking patterns with variations in locking area and holes diameter were used as embedded parts of composite panel. The results show that increasing the Density of foamed Concrete results in higher bond strength and a locking system is an improper technique for foamed Concrete with a Density lower than 1000 kg/m 3 .
M Sanchez I De Rojas - One of the best experts on this subject based on the ideXlab platform.
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inclusion of construction and demolition waste as a coarse aggregate and a cement addition in structural Concrete design
Archives of Civil and Mechanical Engineering, 2019Co-Authors: B Cantero, M Sanchez I De Rojas, I Saez F Del Bosque, A Matias, C MedinaAbstract:Abstract Dissociating economic growth from the use of natural resources is imperative to the sustainable development of the construction industry. The use of secondary raw materials by processing and managing construction and demolition waste (C&DW) is one of the major challenges to transition to a circular economy. This study assessed the effect of simultaneously using cement additioned with the ceramic (fired clay-based) fraction of C&DW and recycled mixed aggregate (RMA) in Concrete manufacture by analysing fresh Concrete workability, Density and air content and hardened Concrete compressive, flexural and splitting tensile strength. Regression and variance analyses were run on the findings to determine the effect of RMA and cement type and their interaction on the dependent variables. The percentage of RMA was observed to be the most significant determinant for Concrete Density and air content. Early age compressive strength was impacted by cement type, although strength in the later age materials was comparable to that of Concrete manufactured with conventional cement. The combined effect of cement type and percentage of RMA appeared to have no significant effect on tensile or flexural strength. On the contrary, the differences observed in these properties were due to the separate effect of each factor. The findings showed that the use of cement containing C&DW additions and up to 50% RMA did not substantially compromise Concrete performance.
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effect of the constituents asphalt clay materials floating particles and fines of construction and demolition waste on the properties of recycled Concretes
Construction and Building Materials, 2015Co-Authors: C Medina, Wenzhong Zhu, Torsten Howind, Moises Frias, M Sanchez I De RojasAbstract:Abstract The present study explores the viability of reusing mixed recycled aggregate from construction and demolition waste as a partial (25 and 50 wt%) replacement for natural coarse aggregate in the manufacture of Concretes with a compressive strength of 30 MPa. It further analyses the effect of some of the constituents (asphalt, clay-based materials, floating particles and fines) of these recycled aggregates on the properties of recycled Concretes. Despite the high asphalt and floating particle content of the recycled aggregate used, came from waste management plant at Glasgow, it was found to have no adverse effect on the workability of the new Concretes. Hardened Concrete Density and compressive strength were observed to decline with increasing replacement ratios, at a variable rate depending on the components of the recycled aggregate mix and the thickness of their ITZs (the thicker the weaker). While Concrete with 25% recycled aggregate exhibited lower sorptivity than the reference Concrete, absorption was higher when the replacement ratio was 50%. The findings showed that this type of recycled aggregate can be used in Concrete manufactured for housing applications and confirmed the importance of good construction and demolition waste management to deliver high quality recycled aggregate.