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

PVA纤维分散性及纤维混凝土弯曲韧性试验研究

邓宗才1，赵连志2，丁建明1，贺少锋1

2021年第8期

摘要

引用本文

摘要：提出了一种新型纤维混凝土拌和工序和评价纤维分散性的简易方法，并研究了不同掺量PVA纤维对混凝土力学性能和弯曲韧性的影响。结果表明：新型拌合工序可以有效降低对纤维的损伤，有助于纤维在混凝土中均匀分散；当纤维掺量为4.5 kg/m3和7.5 kg/m3时，纤维分散性较好，而当纤维掺量为10.5 kg/m3时，纤维分散性欠佳；随着PVA纤维掺量的增加，混凝土的抗压、抗拉强度先增后减，弯拉强度和韧性耗能能力逐渐增强。 Abstract: A new mixing process of the fiber-reinforced concrete and a simple method for evaluating fiber dispersion were put forward, and the effects of different contents of PVA fiber on the mechanical properties and flexural toughness of concrete were studied. The results show that the new mixing method can effectively reduce the damage to the fiber and help the fiber disperse evenly in the concrete. When the fiber content is 4.5 kg/m3 and 7.5 kg/m3, the fiber dispersion is better, but the fiber dispersion is unsatisfactory when the fiber content is 10.5 kg/m3. With the increase of PVA fiber content, the compressive strength and tensile strength increase first and then decrease, and the flexural tensile strength and the toughness energy dissipation capacity gradually increase.

邓宗才,赵连志,丁建明,等.PVA纤维分散性及纤维混凝土弯曲韧性试验研究[J].混凝土与水泥制品,2021(8):49-53. DENG Z C,ZHAO L Z,DING J M,et al.Experimental Study on PVA Fiber Dispersion and Bending Toughness of Fiber Reinforced Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):49-53.

复掺纤维和玻化微珠对湿热环境下混凝土性能的影响

吕家栋1，赵立财1,2

2021年第8期

摘要

引用本文

摘要：研究了复掺钢纤维、聚丙烯纤维和玻化微珠对混凝土抗压性能的影响，通过微观定量方法描述了混凝土孔隙结构与抗压性能之间的关系，结合声发射技术分析了湿热环境下混凝土的压缩破坏特征。结果表明：复掺钢纤维、聚丙烯纤维和玻化微珠混凝土在各级温度下的抗压强度均最高，且随温度上升的强度损失率最低；复掺钢纤维、聚丙烯纤维和玻化微珠混凝土的孔隙率和孔隙分形维数与抗压强度有良好的非线性关系；复掺钢纤维、聚丙烯纤维和玻化微珠可使混凝土的破坏形式从以张拉破坏为主转变为以剪切破坏为主。 Abstract: The effects of steel fiber, polypropylene fiber and vitrified beads on the compressive performance of concrete were studied, and the relationship between pore structure and compressive performance of concrete was described by microscopic quantitative method, and the compression failure characteristics of concrete under hot-humid environment were studied. The results show that the compressive strength of the concrete mixed with steel fiber, polypropylene fiber and vitrified beads is the highest at all temperatures, and the strength loss rate with the increase of temperature is the lowest. The porosity and fractal dimension of the concrete mixed with steel fiber, polypropylene fiber and vitrified beads have good nonlinear relationship with compressive strength. The addition of steel fiber, polypropylene fiber and vitrified beads can change the concrete failure mode from tensile failure to shear failure.

吕家栋,赵立财.复掺纤维和玻化微珠对湿热环境下混凝土性能的影响[J].混凝土与水泥制品,2021(8):54-58. LYU J D,ZHAO L C.Effects of Composite Fiber and Vitrified Beads on the Performance of Concrete in Hot-humid Environment[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):54-58.

基于响应面法的玄武岩纤维再生混凝土力学性能分析

陈兴祥，谭燕，童瑶，张维维

2021年第8期

摘要

引用本文

摘要：基于Design Expert软件，采用响应面法（RSM）分析了玄武岩纤维（BF）长度和体积掺量对再生粗骨料替代率为20%的玄武岩纤维再生混凝土（BFRAC）力学性能的影响。结果表明：BF体积掺量对BFRAC力学性能的影响程度大于BF长度；对于抗折强度、劈裂抗拉强度和抗压强度，对应的BF最佳掺量分别为0.2%、0.1% 和0.2%。 Abstract: Based on Design Expert software, the response surface method(RSM) was used to analyze the influence of basalt fiber (BF) length and volume content on the mechanical properties of basalt fiber recycled concrete(BFRAC) with 20% replacement rate of recycled coarse aggregate. The results show that BF volume content has a greater influence on the mechanical properties of BFRAC than that of BF length. For the flexural strength, split tensile strength and compressive strength of BFRAC, the corresponding optimal BF content is 0.2%, 0.1% and 0.2%, respectively.

陈兴祥,谭燕,童瑶,等.基于响应面法的玄武岩纤维再生混凝土力学性能分析[J].混凝土与水泥制品,2021(8):59-63. CHEN X X,TAN Y,TONG Y,et al.Analysis of Mechanical Properties of Basalt Fiber Recycled Concrete Based on Response Surface Method[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):59-63.

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