scholarly journals Preparation and characterization of red mud based porous materials

2021 ◽  
Vol 2109 (1) ◽  
pp. 012023
Author(s):  
Junge Zhu ◽  
Hongzhi Yue ◽  
Rong Bai ◽  
Jianping Zhu ◽  
Laijun Ma
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Porous Materials ◽  
Red Mud ◽  
Local Governments ◽  
Glass Powder ◽  
Difficult Problem ◽  
Average Pore ◽  
Large Country

Abstract China was a large country in bauxite mining and refining. One ton of alumina was produced, accompanied by 0.5 ~ 2 tons of red mud [1]. Therefore, the accumulation and pollution of red mud had been a difficult problem to be solved by enterprises and local governments. In this paper, red mud based porous materials were prepared with Bayer red mud, perlite, silicon carbide (as foaming agent) and glass powder (as flux). The effects of sintering process and iron oxide on thermal conductivity, bulk density, porosity and compressive strength of red mud based porous materials were studied by TG-DSC, XRD, SEM and XEDS. The results show that red mud based porous materials with uniform pore distribution could be obtained when the amount of red mud was 60%, perlite was 37%, SiC was 1%, glass powder was 2%, sintering temperature was 1150 °C and holding time was 120 min. The true porosity of the red mud based porous material was 70%, and the average pore diameter was 216.84 μ m. The thermal conductivity was 0.26w / (m • K) and the compressive strength was 2.31MPa.

Preparation and Characterization of CCCW/Foamed Concrete Composite

2011 ◽  
Vol 261-263 ◽  
pp. 13-18
Author(s):  
Ke Qing Li ◽  
De Ping Chen ◽  
Shi Li Zhang ◽  
Bao Shun Liu
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Water Absorption ◽  
Heat Insulation ◽  
High Humidity ◽  
Underground Engineering ◽  
New Approach ◽  
Foamed Concrete ◽  
Insulation Performance

Aimed at improving the waterproofing property of foamed concrete, a heat-insulating and waterproofing composite applied in underground engineering was prepared by using cementitious capillary crystalline waterproofing material and foamed concrete. The properties of foamed concrete and composite such as compressive strength, water absorption and thermal conductivity were tested and contrasted, and the compounding reaction mechanism was analyzed. The results show that, compared with foamed concrete, the water absorption of composite has been significantly reduced while the heat-insulating property of foamed concrete is maintained and the overall waterproofing and heat-insulation performance has been significantly improved. A new approach solving underground heat-harm such as high temperature and high humidity is provided.

Synthesis and Characterization of Red Mud and Sawdust Based Geopolymer Composites as Potential Construction Material

2018 ◽  
Vol 923 ◽  
pp. 130-134 ◽  
Author(s):  
Ing Kong ◽  
Kay Min Khoo ◽  
Oliver Buddrick ◽  
Abdul Aziz Baharuddin ◽  
Pooria Khalili
Keyword(s):  
Compressive Strength ◽  
Red Mud ◽  
Raw Materials ◽  
Construction Material ◽  
Testing Machine ◽  
Industrial Wastes ◽  
Sem Images ◽  
Universal Testing ◽  
Geopolymer Composites

The aim of this study was to synthesize the geopolymer composites formed by two industrial wastes, namely red mud (RM) and saw dust (SD). SD was chemically treated with alkali for the removal of lignin and subsequently bleached, before forming composite with acid-modified RM. The composites were then characterized by using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetic analysis (TGA) and universal testing machine to study the morphology, chemical, thermal and mechanical properties. The FTIR spectrum showed that Si and Al from the raw materials played the major role in forming aluminosilicate geopolymer composites. The SEM images revealed that SD and RM particles aggregated to form fully condensed geopolymer matrices with high compressive strength of 8.3-138 MPa, which were comparable to Portland cement (compressive strength of 9-20.7 MPa).

scholarly journals Effects of the Variety and Content of Natural Pozzolan Coarse Aggregate on the Thermo-Mechanical Properties of Concrete

2021 ◽  
Vol 12 (4) ◽  
pp. 5405-5415
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Coarse Aggregate ◽  
The Other ◽  
Natural Pozzolan ◽  
Coarse Aggregates ◽  
Natural Aggregate ◽  
Middle Atlas

The present study investigated the effects of the variety and content of three natural pozzolan coarse aggregates on concrete. Natural pozzolan aggregates have been obtained from three volcanoes (Boutagrouine, Timahdite, and Jbel Hebri) located in the Middle Atlas region in Morocco. The three pozzolans studied were characterized, and then a comparison was made by replacing the natural aggregate with the pozzolan aggregate in the concrete in different percentages, namely 25, 50, and 100 % in volume. The results showed that the variety and content of pozzolan aggregate have a significant impact on the properties of concrete, primarily caused by the characterization of pozzolan aggregate. The density of concrete decreases with the addition of pozzolan aggregate, which decreases depending on the type of pozzolan aggregate used. The highest compressive strength was measured in the concrete specimens prepared with aggregate BP while the lowest compressive strength was noted in the concrete specimens prepared with aggregate RP. On the other hand, the substitution of NA at 100% by BP, GP, and RP aggregates leads to a decrease in the thermal conductivity of about 67%, 62%, and 55% respectively.

scholarly journals Effect of microsilica content on microstructure and properties of foamed ceramics with needle-like mullite

2019 ◽  
Vol 13 (2) ◽  
pp. 202-209 ◽  
Author(s):  
Wenying Zhou ◽  
Wen Yan ◽  
Nan Li ◽  
Yuanbing Li ◽  
Yajie Dai ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Raw Materials ◽  
Average Pore Size ◽  
High Porosity ◽  
Sintering Process ◽  
Average Pore ◽  
Linear Change ◽  
Direct Foaming Method ◽  
Industrial Alumina

In this study, five foamed ceramics with struts containing needle-like mullite were prepared by direct-foaming method using white clay, industrial alumina and microsilica powder as raw materials. The effects of microsilica content on the phase compositions, microstructures and properties of foamed ceramics were investigated. The results showed that the adding of microsilica decreased the average pore size and apparent porosity and increased the compressive strength and thermal conductivity of the foamed ceramics by affecting the properties of foamed slurry and reaction sintering process. The foamed ceramics with 10 wt.% microsilica content showed the best properties with high porosity of 75.8%, positive reheating linear change, compressive strength of 1.44MPa and low thermal conductivity of 0.219W/(m?K) (at 350?C).

scholarly journals Preparation and Characterization of GF Modified Waste Rigid Polyurethane Foam

2021 ◽  
Vol 57 (4) ◽  
pp. 275-285
Author(s):  
Xiaohua Gu ◽  
Hongxiang Luo ◽  
Ke Xv ◽  
Wenxiang Qiu ◽  
Peng Chen
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Infrared Spectrum ◽  
Ethylene Glycol ◽  
Water Absorption ◽  
Polyurethane Foam ◽  
Diethylene Glycol ◽  
Chemical Degradation ◽  
Rigid Polyurethane Foam

The preparation of polyether polyols from waste rigid polyurethane foam has been achieved by chemical degradation of ethylene glycol and diethylene glycol as the degradation agent. Then, the modified rigid polyurethane foam was prepared by polyether polyols and glass fiber. To detect the characteristic of rigid polyurethane foam, the density, water absorption, compressive strength, thermal conductivity, infrared spectrum, morphology structure had been tested. Finally, the best degradation formula was explored, and the modified rigid polyurethane foam had been prepared from the recycled polyol.

Fabrication of Glass Foams from Industrial Wastes Used as Insulating Board

2013 ◽  
Vol 770 ◽  
pp. 205-208 ◽  
Author(s):  
K. Pawanawichian ◽  
W. Thiemsorn ◽  
Anucha Wannagon ◽  
P. Laoarun
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Cell Walls ◽  
Pore Diameter ◽  
Sintering Temperature ◽  
Industrial Wastes ◽  
Average Pore ◽  
Wet Process ◽  
Commercial Soap ◽  
Glass Foam

nsulating glass foam (IGF) was successfully fabricated by wet process. The starting proportion of 65 wt% waste glass, 12 wt% slag, 23 wt% commercial soap was added with 15 wt% Na2SiO3 and represented then was sintered at 725 °C. The IGF had cellular structure with the macro-pore size at 0.428 mm and thin cell walls. Density, thermal conductivity and compressive strength were 0.310 g/cm3, 0.130 W/m.K and 0.78 MPa, respectively. The average pore diameter and porosity increased with increasing the Na2SiO3 concentration and the sintering temperature. On the other hand, the density, thermal conductivity and compressive strength were decreased.

Characterization of Power Plant Bottom Ash and its Application to Cement Mortar

2009 ◽  
Vol 620-622 ◽  
pp. 221-224
Author(s):  
Woo Teck Kwon ◽  
Byung Ik Kim ◽  
Y. Kim ◽  
Soo Ryong Kim ◽  
Sang Wook Ha
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Fly Ash ◽  
Power Plant ◽  
Building Material ◽  
Cement Mortar ◽  
Bottom Ash ◽  
Chemical Properties ◽  
Chemical Compositions

In this work, the physical & chemical properties of bottom ash generated from power plant are analyzed. Characteristic mortar property and thermal conductivity for building material were investigated with content of added bottom ash. According to the analytic result of bottom ash, chemical compositions of bottom ash is similar to those of fly ash and compressive strength after 7days related to pozzolanic activity shows 2.5N/cm2 and it is confirmed that bottom ash possess a certain amount of moisture activity. Although the fluidity of cement mortar is rapidly decreased with increasing addition of bottom ash, compressive strength for 3 and 7days is increased. The thermal conductivity is not sensitive to the addition of bottom ash.

Preparation and characterization of red mud sintered porous materials for water defluoridation

2013 ◽  
Vol 74 ◽  
pp. 95-101 ◽  
Author(s):  
Guocheng Lv ◽  
Limei Wu ◽  
Libing Liao ◽  
Yihe Zhang ◽  
Zhaohui Li
Keyword(s):  
Porous Materials ◽  
Red Mud
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