橡胶粉、硅灰及二元混合物对ASR的抑制作用
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内蒙古科技大学

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内蒙古自治区自然科学基金,面上项目,项目编号2019MS05052,项目名称:基于加速试验的混凝土结构碱-硅酸反应寿命预测研究;国家自然科学基金项目:季冻区高性能橡胶混凝土路面结构的损伤机理及力学响应研究,51868063


Influence of Waste Rubber Powder, Silica Fume and Binary Blends with Them on Mitigating Alkali-Silica Reaction (ASR)
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Inner Mongolia University of Science and Technology

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Inner Mongolia Natural Science Foundation of China (2019MS05052);The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan),51868063

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    摘要:

    采用快速砂浆棒法,研究废旧轮胎橡胶粉(WRP)、硅灰(SF)单掺及两者复掺对碱硅酸反应(ASR)引起有害膨胀的抑制效果,分析粒径对WRP抑制ASR的影响. 同时结合扫描电镜和X射线衍射等方法,揭示了两者对活性骨料ASR的抑制机理. 结果表明:WRP能够抑制ASR,但粒径影响抑制效果,本文120目WRP效果最佳;SF对ASR抑制效果早期较好,而后期不够理想;复掺SF+WRP对抑制ASR膨胀协同作用优异. 前期SF发生火山灰反应,水化产物具有缚碱能力,有效抑制ASR负面效应,改善了WRP周边砂浆的密实性,后期WRP利用其物理性能降低膨胀压,从而协同缓解了ASR引起的膨胀.

    Abstract:

    The influence of waste rubber powder (WRP), silica fume (SF) and binary blends with them on mitigating alkali-silica reaction (ASR) was studied by accelerated mortar bar test (AMBT), the effect of WRP sizes on ASR was compared. The inhibition mechanism on ASR was revealed according to SEM and XRD. The results show that WRP can inhibit ASR, but the particle size is a significant parameter on mitigating ASR, the 120 mesh is the best in this paper;?the inhibition effect of SF on ASR expansion is better at early stage, but not ideal in late stage; and it has an excellent synergistic effect on inhibiting ASR mixing with SF+WRP. The pozzolanic reaction of SF at early stage generates gel with strong alkali absorption capacity, which improves the compactness of microstructure about WRP and mitigates the negative effects of ASR. In the later, WRP could effectively use physical properties to reduce the expansion pressure, so they could alleviate the expansion caused by ASR synergistically.

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  • 收稿日期:2022-03-11
  • 最后修改日期:2022-05-01
  • 录用日期:2022-05-02
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