纳米二氧化钛和聚丙烯纤维对再生骨料混凝土力学性能和耐久性的影响

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Xiong Wei, Wang Xiaoqing, Li Chunmei
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引用次数: 0

摘要

聚丙烯纤维再生混凝土(PRAC)和纳米二氧化钛再生混凝土(TRAC)是通过添加不同体积含量的聚丙烯纤维和纳米二氧化钛制备而成的。实验结果表明,PPF 和纳米二氧化钛对 RAC 的劈裂拉伸强度的改善效果优于抗压强度。当纳米二氧化钛和 PPF 的体积含量分别为 0.8% 和 1.0% 时,相应的混凝土劈裂抗拉强度达到最大值(3.4 和 3.7 兆帕)。不同体积含量的纳米二氧化钛和 PPF 对 RAC 力学性能的贡献率具有最佳值,分别为 0.4% 和 1.0%。纳米二氧化钛和 PPF 的加入能有效抑制冻融条件下 RAC 质量的损失和孔隙的产生,减缓动态弹性模量的下降。当 PPF 的体积含量为 1.0%、纳米二氧化钛的体积含量为 0.4% 时,对 RAC 内部结构的保护效果更好,其抗碳性能也更好。RSM 模型分析和预测结果表明,PPF 和纳米二氧化钛均可作为改善 RAC 力学性能和耐久性能的外加剂材料,且 PPF 对 RAC 性能的综合改善效果优于纳米二氧化钛。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of Nano-TiO2 and Polypropylene Fiber on Mechanical Properties and Durability of Recycled Aggregate Concrete

Effect of Nano-TiO2 and Polypropylene Fiber on Mechanical Properties and Durability of Recycled Aggregate Concrete

In order to promote the engineering application of recycled concrete, the effects of PPF and nano-TiO2 dioxide on the mechanical properties and durability of recycled concrete were studied.

Polypropylene fiber recycled concrete(PRAC) and nano-TiO2 recycled concrete(TRAC) were prepared by adding different volume contents of PPF and nano-TiO2. The experimental findings demonstrated that the PPF and nano-TiO2 improved the splitting tensile strength of RAC better than the compressive strength. When the volume content of nano-TiO2. and PPF is 0.8% and 1.0%, respectively, the corresponding splitting tensile strength of concrete reaches the maximum value(3.4 and 3.7 MPa). The contribution rates of nano-TiO2 and PPF with different volume contents to the mechanical properties of RAC have optimal values, which are 0.4 and 1.0%, respectively. The incorporation of nano-TiO2 and PPF can effectively inhibit the loss of RAC mass and the generation of pores under freeze–thaw conditions, and slow down the decrease of dynamic elastic modulus. When the volume content of PPF is 1.0% and the volume content of nano-TiO2 is 0.4%, the protection effect on the internal structure of RAC is better, and its carbon resistance is better. The results of RSM model analysis and prediction show that both PPF and nano-TiO2 can be used as admixture materials to improve the mechanical properties and durability of RAC, and the comprehensive improvement effect of PPF on RAC performance is better than that of nano-TiO2.

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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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