The Experts below are selected from a list of 18354 Experts worldwide ranked by ideXlab platform
Sumit Chakraborty - One of the best experts on this subject based on the ideXlab platform.
-
effectiveness of sewage sludge ash combined with waste pozzolanic minerals in developing Sustainable Construction Material an alternative approach for waste management
Journal of Cleaner Production, 2017Co-Authors: Sumit Chakraborty, Byungwan Jo, Jun Ho Jo, Zafar BalochAbstract:Abstract Utilization of the sewage sludge ash in fabricating the Construction Material would be an effective alternative approach under the sludge management scheme other than landfilling. The present investigation deals with the utilization of the recycled sewage sludge ash (SSA) combined with the quicklime (QL) and blast furnace slag (BFS) as a cementitious Material in controlling the physical and mechanical performances of mortar. The mortar samples were prepared using the different amount of SSA, QL, BFS, and alkali activator (AA). The performance of the sewage sludge ash based mortar (SAM) was evaluated measuring the bulk density, apparent porosity, compressive strength, flexural strength, and shrinkage strain, etc. The result reveals that the higher dose of AA (50% weight w.r.t the volume of water used) and QL (20% w.r.t. weight of the total cementitious Material) influences the mechanical strength of SAM. Additionally, the optimum dose of the BFS (10% w.r.t. weight of the total cementitious Material) leads to yield a maximum compressive strength (31.3 MPa) of SAM. Finally, based on the analytical analysis, a model has been proposed to explain the overall performance of the SAM. Hence, the utilization of SSA (70%) combined with QL (20%) and BFS (10%) for the fabrication of mortar and concrete is assumed to be an effective alternative technique in developing Sustainable Construction Material and waste management as well.
-
Synthesis of a cementitious Material nanocement using bottom-up nanotechnology concept: an alternative approach to avoid CO 2 emission during production of cement
Journal of Nanomaterials, 2014Co-Authors: Sumit Chakraborty, Kwang Won YoonAbstract:The world's increasing need is to develop smart and Sustainable Construction Material, which will generate minimal climate changing gas during their production. The bottom-up nanotechnology has established itself as a promising alternative technique for the production of the cementitious Material. The present investigation deals with the chemical synthesis of cementitious Material using nanosilica, sodium aluminate, sodium hydroxide, and calcium nitrate as reacting phases. The characteristic properties of the chemically synthesized nanocement were verified by the chemical composition analysis, setting time measurement, particle size distribution, fineness analysis, and SEM and XRD analyses. Finally, the performance of the nanocement was ensured by the fabrication and characterization of the nanocement based mortar. Comparing the results with the commercially available cement product, it is demonstrated that the chemically synthesized nanocement not only shows better physical and mechanical performance, but also brings several encouraging impacts to the society, including the reduction of CO2 emission and the development of Sustainable Construction Material. A plausible reaction scheme has been proposed to explain the synthesis and the overall performances of the nanocement.
Jose Norambuena-contreras - One of the best experts on this subject based on the ideXlab platform.
-
Evaluation of the thermophysical and heating properties of a composite rubber membrane with energy harvesting purposes
Polymer Testing, 2017Co-Authors: Jose Norambuena-contreras, J.l. Concha, R. Borinaga-treviñoAbstract:Abstract This paper evaluates the thermal behaviour of recycled rubber membranes from End of Life Tyres (ELTs) reinforced with steel wool fibres, and their potential use as solar collectors. The thermophysical and heating properties of the rubber membranes with different steel wool fibre contents were evaluated. The thermal performance of a solar collector prototype manufactured with these membranes was also evaluated. It was proven that the addition of metallic fibres can increase the amount of heat absorbed and the heating rate in the membranes. However, fibre addition over 0.5%/v does not contribute to an increase in the temperature reached. A solar collector prototype fabricated with rubber membranes with 0.5%/v of fibres can transmit the heat absorbed by the membrane to the water, reaching a temperature of 45 °C, thus demonstrating that it can be used as new Sustainable Construction Material for energy harvesting applications.
-
Experimental evaluation of mechanical and thermal properties of recycled rubber membranes reinforced with crushed polyethylene particles
Journal of Cleaner Production, 2017Co-Authors: Jose Norambuena-contreras, E. Silva-robles, I. Gonzalez-torre, Y. Saravia-monteroAbstract:Abstract Recycled rubber powder from shredded End of Life Tyres (ELTs) has been used for the development of a new membrane as Sustainable Construction Material. However, due to the environmental exposure of this recycled rubber membrane, climate conditions may contribute to premature deterioration of the Material, reducing their mechanical strength and durability over time. To improve it, crushed particles from recycled High-Density Polyethylene (HDPE) pellets can be added in the rubber matrix. Particles addition in composite Materials are known for enhancing their physical and mechanical behaviour, although it is not clear how this influence works in this specific case. For these reasons, physical, mechanical and thermal behaviour of particle-reinforced rubber membranes conditioned under different environmental states have been studied. With these purposes, four different membranes with the same rubber powder gradation, but with four different percentages of crushed polyethylene particles and pre-conditioned under four different environmental conditions (dry, water-saturated, cold and ageing) have been considered. The influence of polyethylene particles on the mechanical behaviour of the membranes has been evaluated using tensile strength tests. Additionally, the heat transfer capacity of the membranes has been measured through thermal conductivity tests. Main results of the study showed that polyethylene particles reduced the bulk density of the membranes but increased the air voids content. Moreover, it was found that the crushed polyethylene particles can form channels inside the membranes that reinforce the structure of the composite Material. However, probability analysis results proved that HDPE particles did not significantly contribute to improve tensile mechanical properties of the membranes evaluated under different environmental conditions. Finally, the HDPE particles addition increased the thermal conductivity of the membranes, but with low heat-transfer ability, so these membranes have potential uses with thermal facing purposes.
Zafar Baloch - One of the best experts on this subject based on the ideXlab platform.
-
effectiveness of sewage sludge ash combined with waste pozzolanic minerals in developing Sustainable Construction Material an alternative approach for waste management
Journal of Cleaner Production, 2017Co-Authors: Sumit Chakraborty, Byungwan Jo, Jun Ho Jo, Zafar BalochAbstract:Abstract Utilization of the sewage sludge ash in fabricating the Construction Material would be an effective alternative approach under the sludge management scheme other than landfilling. The present investigation deals with the utilization of the recycled sewage sludge ash (SSA) combined with the quicklime (QL) and blast furnace slag (BFS) as a cementitious Material in controlling the physical and mechanical performances of mortar. The mortar samples were prepared using the different amount of SSA, QL, BFS, and alkali activator (AA). The performance of the sewage sludge ash based mortar (SAM) was evaluated measuring the bulk density, apparent porosity, compressive strength, flexural strength, and shrinkage strain, etc. The result reveals that the higher dose of AA (50% weight w.r.t the volume of water used) and QL (20% w.r.t. weight of the total cementitious Material) influences the mechanical strength of SAM. Additionally, the optimum dose of the BFS (10% w.r.t. weight of the total cementitious Material) leads to yield a maximum compressive strength (31.3 MPa) of SAM. Finally, based on the analytical analysis, a model has been proposed to explain the overall performance of the SAM. Hence, the utilization of SSA (70%) combined with QL (20%) and BFS (10%) for the fabrication of mortar and concrete is assumed to be an effective alternative technique in developing Sustainable Construction Material and waste management as well.
Y. Saravia-montero - One of the best experts on this subject based on the ideXlab platform.
-
Experimental evaluation of mechanical and thermal properties of recycled rubber membranes reinforced with crushed polyethylene particles
Journal of Cleaner Production, 2017Co-Authors: Jose Norambuena-contreras, E. Silva-robles, I. Gonzalez-torre, Y. Saravia-monteroAbstract:Abstract Recycled rubber powder from shredded End of Life Tyres (ELTs) has been used for the development of a new membrane as Sustainable Construction Material. However, due to the environmental exposure of this recycled rubber membrane, climate conditions may contribute to premature deterioration of the Material, reducing their mechanical strength and durability over time. To improve it, crushed particles from recycled High-Density Polyethylene (HDPE) pellets can be added in the rubber matrix. Particles addition in composite Materials are known for enhancing their physical and mechanical behaviour, although it is not clear how this influence works in this specific case. For these reasons, physical, mechanical and thermal behaviour of particle-reinforced rubber membranes conditioned under different environmental states have been studied. With these purposes, four different membranes with the same rubber powder gradation, but with four different percentages of crushed polyethylene particles and pre-conditioned under four different environmental conditions (dry, water-saturated, cold and ageing) have been considered. The influence of polyethylene particles on the mechanical behaviour of the membranes has been evaluated using tensile strength tests. Additionally, the heat transfer capacity of the membranes has been measured through thermal conductivity tests. Main results of the study showed that polyethylene particles reduced the bulk density of the membranes but increased the air voids content. Moreover, it was found that the crushed polyethylene particles can form channels inside the membranes that reinforce the structure of the composite Material. However, probability analysis results proved that HDPE particles did not significantly contribute to improve tensile mechanical properties of the membranes evaluated under different environmental conditions. Finally, the HDPE particles addition increased the thermal conductivity of the membranes, but with low heat-transfer ability, so these membranes have potential uses with thermal facing purposes.
R. Borinaga-treviño - One of the best experts on this subject based on the ideXlab platform.
-
Evaluation of the thermophysical and heating properties of a composite rubber membrane with energy harvesting purposes
Polymer Testing, 2017Co-Authors: Jose Norambuena-contreras, J.l. Concha, R. Borinaga-treviñoAbstract:Abstract This paper evaluates the thermal behaviour of recycled rubber membranes from End of Life Tyres (ELTs) reinforced with steel wool fibres, and their potential use as solar collectors. The thermophysical and heating properties of the rubber membranes with different steel wool fibre contents were evaluated. The thermal performance of a solar collector prototype manufactured with these membranes was also evaluated. It was proven that the addition of metallic fibres can increase the amount of heat absorbed and the heating rate in the membranes. However, fibre addition over 0.5%/v does not contribute to an increase in the temperature reached. A solar collector prototype fabricated with rubber membranes with 0.5%/v of fibres can transmit the heat absorbed by the membrane to the water, reaching a temperature of 45 °C, thus demonstrating that it can be used as new Sustainable Construction Material for energy harvesting applications.
