The Experts below are selected from a list of 7035 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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durability of polymer modified lightweight aggregate concrete
Cement & Concrete Composites, 2004Co-Authors: Joao Adriano Rossignolo, Marcos Vinicio Costa AgnesiniAbstract:Abstract 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.
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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.
Qin Zhao - One of the best experts on this subject based on the ideXlab platform.
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thermo mechanical properties of compaction molded cement based composite containing a high volume fraction of phase change material for thermal energy storage
Composites Part A-applied Science and Manufacturing, 2020Co-Authors: Guochen Sang, Yangkai Zhang, Xiaoyun Du, Qin ZhaoAbstract:Abstract This study presents a novel compaction molded composite of sulphoaluminate cement-based thermal energy storage mortar (SCTESM) containing shape stabilized phase change materials (SSPCM) up to 25.9 wt%. A series of tests were conducted to investigate the thermo-mechanical properties of SCTESM. The results show that the thermal conductivity of the compaction molded SCTESM is about 60% higher than that of casting molded one. A mathematical model for thermal conductivity prediction was proposed with a maximum relative error of 5.69%. Furthermore, the thermal penetration depth of SCTESMs was also analyzed, and the thermal penetration depth of the compaction molded samples was over 30% higher than that of casting molded sample of same SSPCM dosage. The mechanical Strength determination revealed that compaction molding method can increase the 28-Day Compressive Strength and flexural Strength of SCTESM by 28.0% and 40.0% than that of casting molded one with the same SSPCM dosage.
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thermo mechanical properties of compaction molded cement based composite containing a high mass fraction of phase change material for thermal energy storage
Composites Part A-applied Science and Manufacturing, 2020Co-Authors: Guochen Sang, Yangkai Zhang, Min Fan, Hongzhi Cui, Xiaoling Cui, Yiyun Zhu, Qin ZhaoAbstract:Abstract This study presents a novel compaction molded composite of sulphoaluminate cement-based thermal energy storage mortar (SCTESM) containing shape stabilized phase change materials (SSPCM) up to 25.9 wt%. A series of tests were conducted to investigate the thermo-mechanical properties of SCTESM. The results show that the thermal conductivity of the compaction molded SCTESM is about 60% higher than that of casting molded one. A mathematical model for thermal conductivity prediction was proposed with a maximum relative error of 5.69%. Furthermore, the thermal penetration depth of SCTESMs was also analyzed, and the thermal penetration depth of the compaction molded samples was over 30% higher than that of casting molded sample of same SSPCM dosage. The mechanical Strength determination revealed that compaction molding method can increase the 28-Day Compressive Strength and flexural Strength of SCTESM by 28.0% and 40.0% than that of casting molded one with the same SSPCM dosage.
Mohd Zamin Jumaat - One of the best experts on this subject based on the ideXlab platform.
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Properties of metakaolin-blended oil palm shell lightweight concrete
European Journal of Environmental and Civil Engineering, 2016Co-Authors: Kim Hung Mo, Fatin Amirah Mohd Anor, Mohd Zamin Jumaat, U. Johnson Alengaram, K. Jagannadha RaoAbstract:In this paper, the effect of partial replacement of cement with metakaolin (MK) on the Strength properties of oil palm shell (OPS) lightweight concrete was investigated. Generally, 5–20% of partial cement replacement with MK enhanced the Compressive, splitting tensile and flexural Strengths as well as modulus of elasticity of OPS concrete (OPSC). Though the 28 Day Compressive Strength of the OPSC was found in the range of 39–47 MPa, the highest Compressive Strength was obtained for the mix with 10% replacement of MK. Similar replacement level of MK was found optimum for both the splitting tensile and flexural Strengths. In addition, the Strength efficiency of OPSC with MK as partial cement replacement was also investigated and it was found that the increase in the replacement level of MK up to 20% resulted in 49% increase in the Strength efficiency for the OPSC.
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oil palm by products as lightweight aggregate in concrete mixture a review
Journal of Cleaner Production, 2016Co-Authors: Muhammad Aslam, Payam Shafigh, Mohd Zamin JumaatAbstract:Abstract The use of industrial waste as a construction material to build environmentally sustainable structures has several practical and economic advantages. Oil-palm-boiler clinker is a waste material obtained by burning off solid wastes during the process of palm oil extraction. The research performed over the last two decades concerning the use of oil-palm-boiler clinker as a lightweight aggregate to produce structural lightweight aggregate concrete is summarized in this paper. The physical, chemical and mechanical properties of oil-palm-boiler clinker aggregate and the mechanical properties and structural performance of oil-palm-boiler clinker concrete are addressed, discussed, and compared with normal weight concrete. The review of the literature showed that depending on the source of oil-palm-boiler clinker the specific gravity of this aggregate is 15–35% less than normal weight aggregates and it can be used as a lightweight aggregate for making structural lightweight aggregate concrete. Concretes containing oil-palm-boiler clinker as coarse and fine aggregates have the 28-Day Compressive Strength in the range of 17–47 MPa, with a density in the range of 1440–1850 kg/m 3 . While, concretes containing oil-palm-boiler clinker as coarse aggregate and normal sand as fine aggregate have the 28-Day Compressive Strength in the range of 15–35 MPa with a density in the range of 1800–2000 kg/m 3 . Partial replacement of oil palm shell with oil-palm-boiler clinker in oil palm shell lightweight concrete could significantly improve (about 40%) the Compressive Strength of the concrete. The research gaps are also identified in this study to explore the innovative lightweight concrete based on the financial and environmental design factors.
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oil palm shell as a lightweight aggregate for production high Strength lightweight concrete
Construction and Building Materials, 2011Co-Authors: Payam Shafigh, Mohd Zamin Jumaat, Hilmi Bin MahmudAbstract:Abstract In Malaysia, oil palm shell (OPS) is an agricultural solid waste originating from the palm oil industry. In this investigation old OPS was used for production of high Strength lightweight concrete (HSLC). The density, air content, workability, cube Compressive Strength and water absorption were measured. The effect of five types of curing conditions on 28-Day Compressive Strength was studied. The test results showed that by incorporating limestone powder and without it, it is possible to produce the OPS concretes with 28-Day Compressive Strength of about 43–48 MPa and dry density of about 1870–1990 kg/m 3 . The Compressive Strength of OPS HSLC is sensitive to the lack of curing. The water absorption of these concretes is in the range of good concretes.
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comparison of mechanical and bond properties of oil palm kernel shell concrete with normal weight concrete
International Journal of Physical Sciences, 2010Co-Authors: Johnson U Alengaram, Hilmi Bin Mahmud, Mohd Zamin JumaatAbstract:The comparison of the fresh, mechanical and bond properties of grade 30 lightweight concrete, namely oil palm kernel shell concrete (OPKSC) with normal weight concrete (NWC) of similar Strength is presented in this paper. Oil palm kernel shell (OPKS), an industrial waste has been used as lightweight aggregates (LWA) in the OPKSC. In addition, mineral admixtures, 10% of silica fume and 5% fly ash have been used. The OPKSC produced a density reduction of about 20% compared to NWC. The addition of silica fume enhanced the Compressive Strength and thus OPKSC produced 28-Day Compressive Strength up to 37 MPa. The bond stress of the OPKSC was found about 86% of the corresponding NWC; however, there was no slip failure between OPKSC and the reinforcement. Further, the ultimate experimental bond stress of OPKSC was found nearly 2Ω times higher than the theoretical values calculated based on BS standards.
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shear Strength of oil palm shell foamed concrete beams
Materials & Design, 2009Co-Authors: Mohd Zamin Jumaat, Johnson U Alengaram, Hilmi Bin MahmudAbstract:Abstract Four reinforced oil palm shell foamed concrete (OPSFC) beams were fabricated, and their shear behaviour was tested. The OPSFC has a target density of approximately 1600 kg/m 3 and a 28-Day Compressive Strength of about 20 MPa. Two beams were cast with shear reinforcements while the other two were cast without such reinforcements. For comparison, four reinforced normal weight concrete (NWC) beams were also cast. The beams that contained shear links failed in flexure mode, while those without links failed in shear mode. The experimental results indicated that the shear capacities of OPSFC beams without shear links are higher than those of the NWC beams and exhibit more flexural and shear cracks.
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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durability of polymer modified lightweight aggregate concrete
Cement & Concrete Composites, 2004Co-Authors: Joao Adriano Rossignolo, Marcos Vinicio Costa AgnesiniAbstract:Abstract 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.
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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.
Hilmi Bin Mahmud - One of the best experts on this subject based on the ideXlab platform.
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oil palm shell as a lightweight aggregate for production high Strength lightweight concrete
Construction and Building Materials, 2011Co-Authors: Payam Shafigh, Mohd Zamin Jumaat, Hilmi Bin MahmudAbstract:Abstract In Malaysia, oil palm shell (OPS) is an agricultural solid waste originating from the palm oil industry. In this investigation old OPS was used for production of high Strength lightweight concrete (HSLC). The density, air content, workability, cube Compressive Strength and water absorption were measured. The effect of five types of curing conditions on 28-Day Compressive Strength was studied. The test results showed that by incorporating limestone powder and without it, it is possible to produce the OPS concretes with 28-Day Compressive Strength of about 43–48 MPa and dry density of about 1870–1990 kg/m 3 . The Compressive Strength of OPS HSLC is sensitive to the lack of curing. The water absorption of these concretes is in the range of good concretes.
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comparison of mechanical and bond properties of oil palm kernel shell concrete with normal weight concrete
International Journal of Physical Sciences, 2010Co-Authors: Johnson U Alengaram, Hilmi Bin Mahmud, Mohd Zamin JumaatAbstract:The comparison of the fresh, mechanical and bond properties of grade 30 lightweight concrete, namely oil palm kernel shell concrete (OPKSC) with normal weight concrete (NWC) of similar Strength is presented in this paper. Oil palm kernel shell (OPKS), an industrial waste has been used as lightweight aggregates (LWA) in the OPKSC. In addition, mineral admixtures, 10% of silica fume and 5% fly ash have been used. The OPKSC produced a density reduction of about 20% compared to NWC. The addition of silica fume enhanced the Compressive Strength and thus OPKSC produced 28-Day Compressive Strength up to 37 MPa. The bond stress of the OPKSC was found about 86% of the corresponding NWC; however, there was no slip failure between OPKSC and the reinforcement. Further, the ultimate experimental bond stress of OPKSC was found nearly 2Ω times higher than the theoretical values calculated based on BS standards.
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shear Strength of oil palm shell foamed concrete beams
Materials & Design, 2009Co-Authors: Mohd Zamin Jumaat, Johnson U Alengaram, Hilmi Bin MahmudAbstract:Abstract Four reinforced oil palm shell foamed concrete (OPSFC) beams were fabricated, and their shear behaviour was tested. The OPSFC has a target density of approximately 1600 kg/m 3 and a 28-Day Compressive Strength of about 20 MPa. Two beams were cast with shear reinforcements while the other two were cast without such reinforcements. For comparison, four reinforced normal weight concrete (NWC) beams were also cast. The beams that contained shear links failed in flexure mode, while those without links failed in shear mode. The experimental results indicated that the shear capacities of OPSFC beams without shear links are higher than those of the NWC beams and exhibit more flexural and shear cracks.
