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

纤维对含粗骨料超高性能混凝土高温性能的影响

钱云峰1，杨鼎宜1,2，夏旸昊1，陆仕祥3，王彤章1

2021年第2期

摘要

引用本文

摘要：为了探究改善超高性能混凝土（UHPC）高温性能的措施，从力学性能、质量损失、超声检测等方面研究了纤维（不掺纤维、单掺钢纤维、混掺钢纤维与合成纤维）对UHPC高温性能的影响。结果表明：当纤维掺量增加时，UHPC的工作性与抗压强度均随之下降，抗折强度则先升后降；随着目标温度的升高，UHPC的残余抗压强度先升后降，损伤逐步加重；纤维的加入可以延缓裂缝的发展，混掺钢纤维与合成纤维可以有效改善UHPC高温爆裂行为。 Abstract: In order to explore the measures to improve the high temperature performance of ultra-high performance concrete(UHPC), the influence of fiber(non-fiber, single steel fiber, mixed steel fiber and synthetic fiber) on the high temperature performance of UHPC was studied from the aspects of mechanical properties, mass loss and ultrasonic testing. The results show that when the fiber content increases, the workability and compressive strength of UHPC decrease, while the flexural strength increases first and then decreases. With the increase of the target temperature, the residual compressive strength increases first and then decreases. The addition of fiber can delay the development of cracks, and the mixing of steel fiber and synthetic fiber can effectively improve the high temperature burst behavior of UHPC.

钱云峰,杨鼎宜,夏旸昊,等.纤维对含粗骨料超高性能混凝土高温性能的影响[J].混凝土与水泥制品,2021(2):51-56. QIAN Y F,YANG D Y,XIA Y H,et al.Influence of Fiber on High Temperature Performance of Ultra-high Performance Concrete With Coarse Aggregate[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):51-56.

聚丙烯-玄武岩混杂纤维对陶粒混凝土力学性能的影响

朱红兵1，施旭刚1，李秀2

2021年第2期

摘要

引用本文

摘要：对掺加聚丙烯-玄武岩混杂纤维的陶粒混凝土进行了抗压强度、抗折强度、劈裂抗拉强度试验，得到了混杂纤维对陶粒混凝土力学性能的影响规律。结果表明：混杂纤维掺量为0.2%时，陶粒混凝土的抗压强度、劈裂抗拉强度、抗折强度提升幅度最大，分别较基准组提高了11.21%、30.73%、15.26%，但掺量过大时陶粒混凝土的力学性能会下降，甚至出现负效应；聚丙烯纤维与玄武岩纤维的混杂比为2∶1时，其对陶粒混凝土的增强效果较好；混杂纤维能增强陶粒混凝土的韧性，对抗折强度和抗拉强度提升效果明显，对抗压强度提升效果较小。 Abstract: The compressive strength, flexural strength and splitting tensile strength tests of ceramsite concrete with polypropylene-basalt hybrid fiber were carried out, and the influence rules of hybrid fiber on the mechanical properties of ceramsite concrete were obtained. The results show that when the hybrid fiber content is 0.2%, the compressive strength, splitting tensile strength and flexural strength of ceramsite concrete have the largest increase, which are increased by 11.21%, 30.73% and 15.26% respectively compared with blank group, but when the hybrid fiber content is too high, the mechanical properties of ceramsite concrete will be decreased or even have negative effect. When the mixing ratio of polypropylene fiber and basalt fiber is 2∶1, the reinforcement effect of ceramsite concrete is great. The toughness of ceramsite concrete can be enhanced by adding hybrid fiber, and the tensile strength and flexural strength are obviously improved, but the effect of improving compressive strength is small.

朱红兵,施旭刚,李秀.聚丙烯-玄武岩混杂纤维对陶粒混凝土力学性能的影响[J].混凝土与水泥制品,2021(2):57-60. ZHU H B,SHI X G,LI X.Influence of Polypropylene-basalt Hybrid Fiber on Mechanical Properties of Ceramsite Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2)::57-60.

基于振动搅拌技术的碳纤维接地导电混凝土制备及性能研究

程育林1，周迁1，刘宇彬1，李兴泽1，冯新军2

2021年第2期

摘要

引用本文

摘要：采用振动搅拌技术，选取碳纤维为导电相制备用于杆塔基础接地的导电混凝土，并对碳纤维导电混凝土的振动搅拌工艺参数、配合比和接地性能进行了试验研究。结果表明：采用振动搅拌技术制备碳纤维导电混凝土的最优工艺参数组合为：干拌时间10 s、湿拌时间70 s、加碳纤维搅拌时间60 s；最优配合比为：碳纤维掺量0.3%、水灰比0.46、单位用水量200 kg、砂率36%；此工艺参数和配合比下，导电混凝土的28 d抗压强度为46.3 MPa，抗折强度为5.7 MPa，28 d电阻率为2.09 Ω·m，导电性能优良，满足输电线路杆塔基础接地的性能要求。 Abstract: Based on the vibration mixing technology, carbon fiber was selected as the conductive phase to prepare the conductive concrete for tower foundation grounding. The vibration mixing process parameters, mix proportion and grounding performance of carbon fiber conductive concrete were studied. The results show that the best combination of process parameters for the preparation of carbon fiber conductive concrete are: dry mixing time of 10 s, wet mixing time of 70 s and carbon fiber mixing time of 60 s. The best mix proportion is: carbon fiber content of 0.3%, water cement ratio of 0.46, unit water ues of 200 kg, sand ratio of 36%. Under this process parameter and mix proportion, the 28 d compressive strength and bending strength of the conductive concrete are 46.3 MPa and 5.7 MPa respectively, and the 28 d resistivity of the conductive concrete is 2.09 Ω·m, which has excellent electrical conductivity and meets the requirements of the grounding performance of the transmission line tower foundation.

程育林,周迁,刘宇彬,等.基于振动搅拌技术的碳纤维接地导电混凝土制备及性能研究[J].混凝土与水泥制品,2021(2):61-64,100. CHENG Y L,ZHOU Q,LIU Y B,et al.Study on Preparation and Performance of Carbon Fiber Grounded Conductive Concrete Based on Vibration Mixing Technology[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):61-64,100.

粉煤灰纤维架构弹性保温隔热材料的研究

刘海顺1，罗志明1，程亚军1，龚小平2，王建东3

2021年第2期

摘要

引用本文

摘要：选用了粉煤灰纤维、超细粉煤灰纤维作为空间架构材料，采用阴离子表面活性剂发泡，以纯熟料水泥凝胶硬化定型，辅以真空抽吸破泡，通过充分干燥及表面防水处理工艺制得了粉煤灰纤维架构弹性保温隔热材料。结果表明：当超细粉煤灰纤维掺量为5%~15%、粉煤灰纤维与纯熟料水泥质量比为0.25、纯熟料水泥掺量为5%~20%时，材料的导热系数普遍在0.04~0.06 W/（m·K）之间，表观密度集中在80~150 kg/m3，抗压强度普遍低于0.20 MPa，所制得的保温隔热材料具有一定的弹性，永久变形量在0.050~0.090 mm之间。 Abstract: Fly ash fiber and ultra-fine fly ash fiber were selected as space structure materials. The anionic surfactant was used for foaming, the pure clinker cement gel was used to harden the shape, and the vacuum suction was used to break the foam, and the fly ash fiber structure elastic thermal insulation material was prepared through full drying and surface waterproof treatment. The results show that when the content of ultra-fine fly ash fiber is 5%~15%, the mass ratio of fly ash fiber to pure clinker cement is 0.25, and the content of pure clinker cement is 5%~20%, the thermal conductivity of the material is universal between 0.04~0.06 W/（m·K）, the apparent density is concentrated in 80~150 kg/m3, and the compressive strength is generally lower than 0.20 MPa. The prepared thermal insulation material has certain elasticity and the permanent deformation is between 0.050~0.090 mm.

刘海顺,罗志明,程亚军,等.粉煤灰纤维架构弹性保温隔热材料的研究[J].混凝土与水泥制品,2021(2):65-68. LIU H S,LUO Z M,CHENG Y J,et al.Study on Elastic Thermal Insulation Materials with Fly Ash Fiber Structure[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):65-68.

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