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  • Open Access

    ARTICLE

    Research on the Performance of Titanium Gypsum Concrete Based on Calcium-Silicon-Sulfur Ratio

    Lixia Guo1,2,3, Weikai Wang1, Ling Zhong1,2,3,*, Yuhang Guo1

    Journal of Renewable Materials, Vol.11, No.1, pp. 423-434, 2023, DOI:10.32604/jrm.2022.022942

    Abstract Based on the high sulfur content in titanium gypsum, the concept of the calcium-silicon-sulfur (Ca/Si/S) ratio was proposed. The Ca/Si/S ratio of concrete was adjusted by changing the titanium gypsum, fly ash, and cement content. The effects of different Ca/Si/S ratios on the mechanical properties, hydration products, and concrete microstructure were investigated by nuclear magnetic resonance, uniaxial compression, and scanning electron microscopy. The result shows: (1) The compressive strength of concrete mixed with titanium gypsum increases first and then decreases with the Ca/Si/S ratio decrease. When the Ca/Si/S ratio is 1:0.85:0.10, the strength reaches the peak and is lower than… More > Graphic Abstract

    Research on the Performance of Titanium Gypsum Concrete Based on Calcium-Silicon-Sulfur Ratio

  • Open Access

    ARTICLE

    Development and Field Application of Phosphogypsum-Based Soil Subgrade Stabilizers

    Hongfei Yue1, Aiguo Fang2, Sudong Hua1,*, Zenghuan Gu3, Yu Jia1, Cheng Yang4

    Journal of Renewable Materials, Vol.10, No.8, pp. 2247-2261, 2022, DOI:10.32604/jrm.2022.018901

    Abstract A phosphogypsum-based subgrade stabilizer (PBSS) was formulated using industrial by-product phosphogypsum (PG), mixed with slag and calcium-silicon-rich active material (GSR). The active powder (AP) was used to modify PBSS, and PBSS-AP was obtained. PBSS and PBSS-AP were each mixed with 10% silty soil, and cement and lime (CAL: 5% lime + 2% cement) were used as the traditional material for comparative experiments. Samples were cured under standard conditions, and tested for unconfined compressive strength (UCS), water stability, volume expansion, and leachate, to explore the stabilization effect of the three solidified materials on silty soil. The results showed that the comprehensive… More >

  • Open Access

    ARTICLE

    Research of Mechanical and Thermal Properties of Composite Material Based on Gypsum and Straw

    Nikola Vavřínová*, Kateřina Stejskalová, Jiří Teslík, Kateřina Kubenková, Jiří Majer

    Journal of Renewable Materials, Vol.10, No.7, pp. 1859-1873, 2022, DOI:10.32604/jrm.2022.018908

    Abstract This article is focused on the investigation of the mechanical and thermal properties of composite material that could be used for the production of plaster or plasterboards. This composite material is made of gypsum and reinforcing natural fibers. The article verifies whether this natural reinforcement can improve the investigated properties compared to conventional plasters and gypsum plasterboards made of pure gypsum. From this composite material, high-strength plasterboards could then be produced, which meet the higher demands of users than conventional gypsum plasterboards. For their production, natural waste materials would be used efficiently. As part of the development of new building… More >

  • Open Access

    ARTICLE

    Study on Performance Regulation and Mechanism of Quicklime and Biopolymer on Hemihydrate Phosphogypsum

    Zaibo Zhou1, Juanhong Liu1,2,3,*, Kun Luo1, Aixiang Wu1,3, Hongjiang Wang1,3

    Journal of Renewable Materials, Vol.10, No.2, pp. 373-384, 2022, DOI:10.32604/jrm.2022.016380

    Abstract In order to reduce the influence of impurities in hemihydrate phosphogypsum(HPG) on the environment and improve the workability of HPG, the effects of the content of quicklime and types of biopolymer (hydroxypropyl methylcellulose, xanthan gum, sodium polyacrylate(PAANa)) on the compressive strength, softening coefficient and ultrasonic velocity of HPG were evaluated. When the content of quicklime was 1.5% and the content of PAANa was 0.2%, HPG had the best mechanical properties and workability, its water retention rate can be increased by 5.8%, and unconfined compressive strength of 3 days increased by 10.3% and 7 days increased by 13.1%. Through the analysis… More > Graphic Abstract

    Study on Performance Regulation and Mechanism of Quicklime and Biopolymer on Hemihydrate Phosphogypsum

  • Open Access

    ARTICLE

    Development of a Soil Stabilizer for Road Subgrade Based on Original Phosphogypsum

    Zenghuan Gu1, Aiguo Fang2, Sudong Hua1,*, Qingzhou Zhao2, Lidong Sun2, Fan Xia2, Liying Qian3, Xiaojian Ren3

    Journal of Renewable Materials, Vol.9, No.2, pp. 253-268, 2021, DOI:10.32604/jrm.2021.011912

    Abstract The research used industrial by-products original phosphogypsum (PG) as the main raw material, slag (SG) and Portland cement (PC) as auxiliary materials, and the optimal additive amount was determined according to the compressive strength value of the sample. Comprehensively evaluate the water resistance and volume stability of the samples, and determine the best formula for new roadbed stabilized materials. The results showed that when the weight ratio of PG, slag and cement was OPG:SG:PC = 6:3:1, and mixed with 5% micro silica fume (MSF) and 3‰ hydroxypropyl methyl cellulose (HPMC), the sample’s comprehensive performance was the best, specifically, the sample’s… More >

  • Open Access

    ARTICLE

    Utilization of Bayer Red Mud Derived from Bauxite for Belite-Ferroaluminate Cement Production

    Yanrong Zhao1,2,3,#, Ping Chen1,4,*,#, Shifeng Wang5, Yaxiong Ji3,4, Yuanhao Wang3,4,*, Bolin Wu1,2, Rongjin Liu1

    Journal of Renewable Materials, Vol.8, No.11, pp. 1531-1541, 2020, DOI:10.32604/jrm.2020.011462

    Abstract Bayer red mud (BRM) is a kind of industrial solid waste characterized by huge volume and high alkalinity. Its disposal generates serious environmental pollution and occupies a large number of farmland. The utilization and recycling of BRM is currently a crucial issue and needs to be addressed as soon as possible. The chemical composition of BRM is similar to cement clinker. In this study, the feasibility of preparing Belite-ferroaluminate clinker (BFAC) with different BRM was explored. The physical properties, mechanics performance, radioactivity levels and trace harmful metals leaching were measured. XRD, BEI and EDS were used to characterize the mineral… More >

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