纤维改性再生骨料透水混凝土力学性能透水性和耐磨性研究
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国家自然科学基金面上项目(51679092);国家自然科学青年基金项目(51309101);河南省重大科技攻关项目(172102210372);河南省产学研合作项目(182107000031)


Research on mechanical properties, permeability and abrasion resistance of fibers modified recycled aggregate pervious concrete
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    摘要:

    再生骨料透水混凝土是利用再生骨料制备透水混凝土,具备再生混凝土和透水混凝土的功能优势,但导致强度、耐磨性变差,故该文进行再生骨料透水混凝土改性研究。将聚丙烯纤维和碳纤维以不同的体积分数(其中聚丙烯纤维掺量分别为0.3%、0.6%、0.9%、1.2%,碳纤维掺量分别为0.2%、0.4%、0.6%、0.8%)掺入再生透水混凝土中,采用WAW-1000电液伺服万能试验机测定力学强度,自制透水装置测定透水系数,洛杉矶磨耗试验机测定耐磨性,获取不同种类和掺量纤维对透水性、力学性能和耐磨性的影响。试验结果表明,聚丙烯纤维和碳纤维的掺入对混凝土的孔隙率和透水系数影响不大,但可提高强度和耐磨性。随着纤维掺量的增加,抗压强度和劈裂抗拉强度呈先增大后减少的趋势;质量损失率也先减少后增大趋势。经优化分析可知聚丙烯纤维最优掺量为0.6%,碳纤维最优掺量为0.4%。该成果可为纤维改性混凝土以及再生骨料透水混凝土的推广应用提供参考。

    Abstract:

    Recycled aggregate pervious concrete are made by cement, water and recycled aggregates, which conforms to the concept of sustainable development, can be used to construction of the sponge city, and has important social and economic benefits. In order to study the application of fiber in recycled aggregate pervious concrete (RAPC), RAPC was prepared with waste prefabricated pavement concrete as the source of recycled aggregate, natural concrete pervious concrete (NAPC) was prepared as a comparison. Two series of fibers added in RAPC were designed, which contained 0.3%, 0.6%, 0.9%, 1.2% polypropylene fiber (PF), and 0.2%, 0.4%, 0.6%, 0.8% carbon fiber (CF) by volume fraction, respectively, RAPC without PF and CF showed as control group. With the experiment on test cubes under standard maintenance, compressive strength, splitting tensile strength, the continuous porosity, the permeability coefficient and the abrasion resistance were measured. The results showed that: 1) Compared with NAPC, the continuous porosity and permeability coefficient of RAPC are lower than those of NAPC, the compressive strength of RAPC has improved by 29.33%, the splitting tensile strength has reduced by 18.12%, the mass loss ratio of RAPC has improved by 11.26%; 2) By adding the fibers to RAPC, the continuous porosity with different volume fractions of fibers varies in a certain range. The continuous porosity of RAPC containing PF ranges from 18.6% to 20.8%, and that of RAPC containing CF ranges from 19.2% to 21.7%. In general, the permeability coefficient changes in a small rang with the changing of fiber content. The permeability coefficient of RAPC with PF ranges from 3.87-4.17 mm/s, and the permeability coefficient of RAPC containing CF ranges from 4.02 - 4.16 mm/s. The effects of PF and CF on the continuous porosity and permeability coefficient of RAPC are similar. 3) By adding PF in RAPC, compressive strength of RAPC is lower than that of control group. By adding CF in RAPC, compressive strength of RAPC increased first and then decreased with the increase of CF content. When the amount of CF up to 0.4%, the compressive strength reached a maximum value of 9.2 MPa which is higher than 14% that of control group. The splitting tensile strength increased first and then decreased with the increase of fiber content. For PF, when the amount of PF up to 0.6%, the compressive strength reached a maximum value of 2.0 MPa which is higher than that of control group (52.67%). For carbon fiber, when the amount of CF up to 0.4%, the compressive strength reached a maximum value of 1.78 MPa which is higher than that of control group (35.88%). 4) PF is better than CF for improving abrasion resistance. When the amount of PF up to 0.9%, the abrasion resistance reached a minimum value, which is lower than that of control group (41.2%). When the amount of CF up to 0.4%, the abrasion resistance reached a minimum value which is lower than that of control group (29.4%). 5) With the application of optimization theory, the optimum amount of PF in RAPC is 0.6%, and the optimal amount of CF in RAPC is 0.4%.The results can provide reference for the promotion and application of fiber-modified concrete and recycled aggregate pervious concrete.

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郭磊,刘思源,陈守开,汪伦焰,薛志龙.纤维改性再生骨料透水混凝土力学性能透水性和耐磨性研究[J].农业工程学报,2019,35(2):153-160. DOI:10.11975/j. issn.1002-6819.2019.02.020

Guo Lei, Liu Siyuan, Chen Shoukai, Wang Lunyan, Xue Zhilong. Research on mechanical properties, permeability and abrasion resistance of fibers modified recycled aggregate pervious concrete[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2019,35(2):153-160. DOI:10.11975/j. issn.1002-6819.2019.02.020

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  • 收稿日期:2018-08-02
  • 最后修改日期:2019-01-02
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  • 在线发布日期: 2019-01-21
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