粉煤灰基地质聚合物再生混凝土的抗硫酸盐性能研究

发布时间：2018-07-02 22:38

本文选题：地质聚合物 + 再生混凝土　；参考：《四川大学学报(工程科学版)》2015年S1期

【摘要】：利用再生粗骨料替代天然粗骨料,设计了6组不同再生骨料取代率(0%、50%和100%)的碱激发粉煤灰基地聚物再生混凝土和普通再生混凝土的配比方案。依据国家标准GB/T 50082—2009中抗硫酸盐侵蚀实验方法,结合地聚物特性通过测定各组试件在不同循环次数下的抗压强度、质量和动弹性模量并结合微观结构变化进行对比分析。结果表明:侵蚀过程中RAC与GRC的质量变化率均较小,RAC最大为1.8%,GRC则为0.7%;3种不同RAC的强度发展趋势相同,但抗蚀系数表明RAC50的抗蚀性能最好;3种GRC试样侵蚀前后强度增长趋势相同,但强度值随再生骨料掺量的增大而减小,抗蚀系数显示侵蚀过程加速了GRC试样强度发展;RAC与GRC侵蚀试样的动弹性模量变化差异也反映了各自强度发展的不同机制;微观分析说明影响RAC试样抗硫酸盐性能的关键因素是孔隙结构,而决定GRC性能发展的主要因素是再生骨料自身的结构缺陷。
[Abstract]:By replacing natural coarse aggregate with regenerated coarse aggregate, six groups of alkaline activated fly ash base recycled concrete and ordinary recycled concrete were designed with different replacement ratio of recycled aggregate (0% and 100%). According to the national standard GB / T 50082-2009, the compressive strength, mass and dynamic elastic modulus of each group of specimens under different cycles were measured and compared with the microstructure changes combined with the characteristics of geopolymer. The results show that the mass change rates of RAC and GRC are smaller than those of GRC. The maximum value of RAC is 1.8%. The strength development trend of three different kinds of RAC is the same. However, the corrosion resistance coefficient shows that the corrosion resistance of RAC50 is the best and the growth trend of the strength of three GRC samples before and after erosion is the same. However, the strength value decreases with the increase of recycled aggregate content, and the corrosion resistance coefficient indicates that the corrosion process accelerates the strength development of GRC specimens. The difference of dynamic elastic modulus between RAC and GRC specimens also reflects the different mechanisms of strength development. The microanalysis shows that the key factor affecting the sulfate resistance of RAC samples is pore structure, and the main factor that determines the development of GRC performance is the structural defect of recycled aggregate itself.
【作者单位】：四川大学能源工程安全与灾害力学教育部重点实验室建筑与环境学院;
【基金】：能源工程与灾害力学教育部重点实验室开放基金资助项目(2013KF06) 国家自然科学基金资助项目(51208325)
【分类号】：TU528

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