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    Effect of Surface Precoated Cementitious Materials on the Properties and Microstructure of PVC Mortars

    Source: Journal of Materials in Civil Engineering:;2025:;Volume ( 037 ):;issue: 007::page 04025205-1
    Author:
    Jiaming Chen
    ,
    Zhihong Pan
    ,
    Qiwei Zhan
    ,
    Changhao Fu
    ,
    Jinwei Wu
    ,
    Shan Jiang
    ,
    Chuanfeng Wang
    ,
    Guangmin Dai
    DOI: 10.1061/JMCEE7.MTENG-17989
    Publisher: American Society of Civil Engineers
    Abstract: The utilization of recycled polyvinyl chloride (PVC) in mortar production not only contributes to the recycling of waste plastics but also reduces the consumption of natural resources. However, the incorporation of PVC often leads to a decline in the mechanical properties of the mortar. This paper investigates the surface modification of waste PVC particles using precoated cementitious materials to improve the performance of PVC mortars. Mortars were prepared by replacing the fine aggregates with equal volumes of PVC particles before and after modification, with volume replacement ratios of 10%, 20%, 30%, and 40%. Experiments were carried out to investigate the changes in the surface properties of the particles before and after modification, as well as the density, consistency, compressive strength, and flexural strength of PVC mortars with different replacement ratios. Scanning electron microscopy, energy dispersive spectroscopy, x-ray diffraction, thermogravimetric analysis, and microhardness were used to analyze the morphology, relative elemental content, material composition, and interfacial strength of the interfacial transition zone (ITZ) between PVC particles and the cementitious material. The results showed that the density of the mortar gradually decreased as the PVC replacement ratio increased and the consistency of the modified mortar was significantly improved. The compressive strength and flexural strength of the mortar at all ages were significantly improved by the modification of the surface precoated cementitious material. Microscopic structural analysis indicated that the cement shell formed by the precoated cementitious material on the surface of PVC particles enhanced the bond between the particles and the cement matrix. After modification, the mass ratio of elemental calcium to silicon at the interface was significantly reduced. At the interface between modified particles and the cement matrix, compared to unmodified particles, there was significant reduction in the amount of low-strength, loosely structured Ca(OH)2, accompanied by an increase in higher-strength hydration products. The increase in microhardness indicated that the strength of the ITZ was improved. Overall, this study demonstrated the feasibility of using modified PVC particles as a replacement for fine aggregates in the preparation of mortar and provided a new solution for the development of new aggregates and the treatment of waste plastics.
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      Effect of Surface Precoated Cementitious Materials on the Properties and Microstructure of PVC Mortars

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    contributor authorJiaming Chen
    contributor authorZhihong Pan
    contributor authorQiwei Zhan
    contributor authorChanghao Fu
    contributor authorJinwei Wu
    contributor authorShan Jiang
    contributor authorChuanfeng Wang
    contributor authorGuangmin Dai
    date accessioned2025-08-17T22:52:50Z
    date available2025-08-17T22:52:50Z
    date copyright7/1/2025 12:00:00 AM
    date issued2025
    identifier otherJMCEE7.MTENG-17989.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4307590
    description abstractThe utilization of recycled polyvinyl chloride (PVC) in mortar production not only contributes to the recycling of waste plastics but also reduces the consumption of natural resources. However, the incorporation of PVC often leads to a decline in the mechanical properties of the mortar. This paper investigates the surface modification of waste PVC particles using precoated cementitious materials to improve the performance of PVC mortars. Mortars were prepared by replacing the fine aggregates with equal volumes of PVC particles before and after modification, with volume replacement ratios of 10%, 20%, 30%, and 40%. Experiments were carried out to investigate the changes in the surface properties of the particles before and after modification, as well as the density, consistency, compressive strength, and flexural strength of PVC mortars with different replacement ratios. Scanning electron microscopy, energy dispersive spectroscopy, x-ray diffraction, thermogravimetric analysis, and microhardness were used to analyze the morphology, relative elemental content, material composition, and interfacial strength of the interfacial transition zone (ITZ) between PVC particles and the cementitious material. The results showed that the density of the mortar gradually decreased as the PVC replacement ratio increased and the consistency of the modified mortar was significantly improved. The compressive strength and flexural strength of the mortar at all ages were significantly improved by the modification of the surface precoated cementitious material. Microscopic structural analysis indicated that the cement shell formed by the precoated cementitious material on the surface of PVC particles enhanced the bond between the particles and the cement matrix. After modification, the mass ratio of elemental calcium to silicon at the interface was significantly reduced. At the interface between modified particles and the cement matrix, compared to unmodified particles, there was significant reduction in the amount of low-strength, loosely structured Ca(OH)2, accompanied by an increase in higher-strength hydration products. The increase in microhardness indicated that the strength of the ITZ was improved. Overall, this study demonstrated the feasibility of using modified PVC particles as a replacement for fine aggregates in the preparation of mortar and provided a new solution for the development of new aggregates and the treatment of waste plastics.
    publisherAmerican Society of Civil Engineers
    titleEffect of Surface Precoated Cementitious Materials on the Properties and Microstructure of PVC Mortars
    typeJournal Article
    journal volume37
    journal issue7
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/JMCEE7.MTENG-17989
    journal fristpage04025205-1
    journal lastpage04025205-14
    page14
    treeJournal of Materials in Civil Engineering:;2025:;Volume ( 037 ):;issue: 007
    contenttypeFulltext
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