纤维水泥及制品_2021_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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纤维水泥及制品

高温后PVA纤维增强水泥基复合材料力学性能试验研究

杨珊1，李祚1，彭林欣1,2，罗月静3,4，滕晓丹1,2,5

2021年第4期

摘要

引用本文

摘要：对经过100 ℃、200 ℃、400 ℃、600 ℃高温处理后的聚乙烯醇纤维增强水泥基复合材料（PVA-ECC）进行了单轴压缩试验、单轴拉伸试验、剪切试验和四点弯曲试验，对不同温度下的试验结果进行了对比分析，拟合了高温后PVA-ECC各项性能的退化曲线，并通过扫描电镜观察了微观结构。结果表明：PVA-ECC在常温下能够表现出良好的变形能力；当温度由常温升至100 ℃时，抗压强度大幅下降，继续升至200 ℃时则有一定提高；当温度超过200 ℃以后，抗压强度、抗拉强度和极限拉应变均降低，试件由延性破坏变为脆性破坏；常温下，PVA-ECC试件表面密实完整，经过400 ℃高温处理后，试件呈现出稀疏多孔结构，温度超过600 ℃时，试件表面呈片状、海绵状形态。 Abstract： Uniaxial compression, uniaxial tensile, shearing and four-point bending tests were carried out on polyvinyl alcohol fiber reinforced cement-based composite materials (PVA-ECC) after high temperature treatment at 100 ℃, 200 ℃, 400 ℃ and 600 ℃. The test results at different temperatures were compared and analyzed, the degradation curves of various properties of PVA-ECC after high temperature were deduced, and the microstructure was observed by scanning electron microscope. The results show that PVA-ECC has good deformation capacity at room temperature. When the temperature rises from room temperature to 100 ℃, the compressive strength decreases greatly, and then increases to a certain extent when it continues to rise to 200 ℃. When the temperature exceeds 200 ℃, the compressive strength, tensile strength and ultimate tensile strain of PVA-ECC are reduced, and the specimen changes from ductile failure to brittle failure. At room temperature, the surface of PVA-ECC is dense and complete. After being treated at 400 ℃, the specimen exhibits a sparse porous structure. When the temperature exceeds 600 °C, the surface of the specimen becomes flake and sponge.

杨珊,李祚,彭林欣,等.高温后PVA纤维增强水泥基复合材料力学性能试验研究[J].混凝土与水泥制品,2021(4):49-54. YANG S,LI Z,PENG L X,et al.Study on Mechanical Properties of PVA-ECC Composites After Elevated Temperature[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):49-54.

混杂纤维轻骨料混凝土力学与导热性能研究

黄晓雯，庞建勇，王凤瑶，沈恒祥，刘宜思

2021年第4期

摘要

引用本文

摘要：采用正交试验对钢-植物混杂纤维轻骨料混凝土（Steel-plant Fibre Hybrid Lightweight Aggregate Concrete，SPFLC）的抗压强度、抗拉强度、抗剪强度和导热性能进行了研究，并使用Matlab软件进行了多元线性回归分析，得到了SPFLC力学性能与导热性能的预测模型。结果表明：陶粒掺量对SPFLC的抗压强度、抗拉强度、抗剪强度和导热性能均有高度显著影响，对抗拉强度的贡献率最大为67.48%；陶砂掺量对SPFLC的抗拉强度几乎无影响，对抗压强度的贡献率最大为49.72%；钢纤维掺量对SPFLC的抗压强度和抗剪强度有高度显著影响，对抗剪强度的贡献率最大为42.36%；植物纤维掺量对SPFLC的力学性能和导热性能均有高度显著影响，对抗拉强度的贡献率最大为26.61%，且随着植物纤维掺量的增加，导热系数最大下降了23.7%；建立的SPFLC力学性能与导热性能预测模型的精度较高。 Abstract: The compressive strength, tensile strength, shear strength and thermal conductivity of steel-plant hybrid fiber lightweight aggregate concrete(SPFLC) were studied by orthogonal tests. The prediction model of mechanical properties and thermal conductivity of SPFLC were obtained by multiple linear regression analysis with Matlab software. The results show that the ceramsite content has a highly significant influence on the compressive strength, tensile strength, shear strength and thermal conductivity of SPFLC, and the maximum contribution rate to tensile strength is 67.48%. The content of ceramic sand has almost no influence on the tensile strength of SPFLC, and the maximum contribution rate to compressive strength is 49.72%. The steel fiber content has a highly significant influence on the compressive strength and shear strength of SPFLC, and the maximum contribution rate to shear strength is 42.36%. The plant fiber content has a highly significant influence on the mechanical and thermal properties of SPFLC, among which the contribution rate to tensile strength is up to 26.61%, and the thermal conductivity decreases by 23.7% with the increase of plant fiber content. The prediction models of mechanical properties and thermal conductivity of SPFLC have a high accuracy.

黄晓雯,庞建勇,王凤瑶,等.混杂纤维轻骨料混凝土力学与导热性能研究[J].混凝土与水泥制品,2021(4):55-59. HUANG X W,PANG J Y,WANG F Y,et al.Study on Mechanical and Thermal Conductivity of Hybrid Fiber Lightweight Aggregate Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):55-59.

预制道面板用活性粉末混凝土性能的影响研究

阎西康1，温家鹏1，杜闯1，周明1，杜二伟2，赵国良3，陈晓4

2021年第4期

摘要

引用本文

阎西康,温家鹏,杜闯,等.预制道面板用活性粉末混凝土性能的影响研究[J].混凝土与水泥制品,2021(4):60-63. YAN X K,WEN J P,DU C,et al.Study on the Performance Influence of Reactive Powder Concrete for Prefabricated Road Panels[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):60-63.

纤维增强自密实混凝土高温性能研究综述

王涵1，刘心洁2，王聪1，程树良3，辛亚军1

2021年第4期

摘要

引用本文

摘要：基于纤维增强机理和混凝土高温爆裂破坏机理，概述了自密实混凝土（Self-compacting Concrete，SCC）的高温爆裂现象，从抗压强度、弯曲性能、弹性模量三个方面总结了国内外关于纤维增强SCC高温力学性能的研究现状与成果，在此基础上，指出了尚未解决的问题以及尚待深入研究的内容。 Abstract: Based on the mechanism of fiber reinforcement and high temperature burst failure of concrete, the high temperature burst phenomenon of self-compacting concrete(SCC) is summarized. The current research status and results of high temperature mechanical properties of fiber-reinforced concrete (SCC) at home and abroad are summarized from three aspects of compressive strength, flexural properties and elastic modulus, and on this basis, the unsolved problems and the contents to be further studied are put forward.

王涵,刘心洁,王聪,等.纤维增强自密实混凝土高温性能研究综述[J].混凝土与水泥制品,2021(4):64-68. WANG H,LIU X J,WANG C,et al.Summary of Research on High Temperature Performance of Fiber Reinforced Self-compacting Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):64-68.

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