Investigating the resistance to severe environmental erosion of modified Pisha sandstone composite materials

IF 6.5 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Changming Li , Yaozong Wang , Shunbo Zhao , Biao Jia , Yongsheng Tong , Ruijuan Li , Yanxin Gong
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Abstract

Pisha sandstone (PS) was the main resource of the Yellow River coarse sediment. This study aimed to investigate the microstructural evolution and the erosion resistance of modified Pisha sandstone composite materials (PCM) in severe environmental erosion, including water, alkali, acid, and sulfate solutions. The mechanical properties of the PCM were assessed using a universal testing machine, while the erosion resistance of the PCM in different environments was compared through the softening coefficient and strength loss rate. Additionally, the study examined the enhancement effects of blast furnace slag and cement admixture on the erosion resistance of the material. Mineralogical composition and microstructure were analyzed using XRD, SEM and TG. The results indicated that the mechanical properties and the erosion resistance of the PCM increased significantly with the addition of blast furnace slag, with the softening coefficient of 0.78 and a strength of 16.3 MPa. After exposure to erosion, the compressive strength of the PCM can reach up to 16.6 MPa, 18.1 MPa, and 17.1 MPa in acidic, alkaline, and sulfate environments, respectively. Further analysis revealed that the types of montmorillonite minerals in the PS has been altered by modification treatment, subsequently the erosion resistance of the PCM has been enhanced. PCM exhibits distinct reaction mechanisms in different environments. The recrystallization of feldspar and calcite enhances structural integrity in water and alkaline environments. The montmorillonite and gel of PCM are subjected to further erosion in the acid environment, which leads to the formation of microcracks. The microscopic morphology of PCM appears layered and convex in sulfate environments.
研究了改性皮沙砂岩复合材料的抗严重环境侵蚀性能
皮沙砂岩(PS)是黄河粗沙的主要来源。研究了改性Pisha砂岩复合材料(PCM)在水、碱、酸、硫酸盐等严重环境侵蚀中的微观结构演变及其抗侵蚀性能。采用万能试验机评估了PCM的力学性能,并通过软化系数和强度损失率比较了PCM在不同环境下的抗侵蚀性能。此外,还考察了高炉矿渣和水泥外加剂对材料抗冲蚀性能的增强作用。采用XRD、SEM、TG等分析了样品的矿物组成和微观结构。结果表明:掺加高炉矿渣后,PCM的力学性能和抗冲蚀性能显著提高,软化系数为0.78,强度为16.3 MPa;经侵蚀后,PCM在酸性、碱性和硫酸盐环境下的抗压强度分别可达16.6 MPa、18.1 MPa和17.1 MPa。进一步分析表明,改性处理改变了PS中蒙脱土矿物的类型,从而提高了PCM的抗侵蚀性能。PCM在不同环境下表现出不同的反应机制。长石和方解石的再结晶增强了水和碱性环境下的结构完整性。PCM的蒙脱土和凝胶在酸性环境中受到进一步的侵蚀,导致微裂纹的形成。在硫酸盐环境下,PCM的显微形态呈层状和凸状。
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来源期刊
CiteScore
7.60
自引率
19.40%
发文量
842
审稿时长
63 days
期刊介绍: Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.
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