铝粉掺量对水泥乳化沥青胶凝材料孔形貌的影响

发布时间：2018-01-15 05:06

本文关键词：铝粉掺量对水泥乳化沥青胶凝材料孔形貌的影响　出处：《硅酸盐学报》2014年10期 　论文类型：期刊论文

【摘要】：利用数码光学显微镜、扫描电子显微镜和能谱仪,研究了不同铝粉掺量的水泥乳化沥青胶凝材料(CAB)的孔形貌特征。结果表明:随着铝粉掺量的增加,CAB中的气孔逐渐增多,孔径级别逐渐多样化,主要原因为掺加的铝粉越多,其与H2O和Ca(OH)2发生的反应越激烈,产生的氢气越多,且平均气孔面积和平均气孔体积率均随铝粉掺量的增加呈指数函数增加。CAB中的大孔孔壁随铝粉掺量的增加愈发光滑,大孔与不同孔径的众多小孔连通,形成蜂窝结构,但孔壁内侧附着的水泥水化产物形貌相差较大。
[Abstract]:The pore morphology of cement emulsified asphalt cementitious material (CAB) with different amount of aluminum powder was studied by means of digital optical microscope, scanning electron microscope and energy spectrometer. The results show that the pore morphology of the cement emulsion asphalt cementitious material increases with the increase of the amount of aluminum powder. The porosity and pore size of CAB increase gradually, the main reason is that the more aluminum powder is added, the more intense the reaction with H2O and Ca(OH)2 is, and the more hydrogen is produced. The average pore area and the average porosity increase with the increase of aluminum powder content. The large pore wall in cab becomes more smooth with the increase of aluminum powder content, and the large pore is connected with many small pores with different pore sizes. Honeycomb structure is formed, but the morphology of cement hydration products attached to the inner wall of the pore is quite different.
【作者单位】：中南大学土木工程学院;湖南农业大学工学院;
【基金】：国家“973”计划(2013CB036200)项目国家自然科学基金(51278498,50978257)资助项目
【分类号】：TU571
【正文快照】： 水泥乳化沥青胶凝材料(CAB)是高速铁路板式无砟轨道的充填层材料——水泥乳化沥青砂浆(CAM)的基体材料,CAM在板式无砟轨道结构中主要起承力、传力、减振和几何调整等作用,其力学性能对板式无砟轨道的耐久性、列车运行的安全性和平顺性有重要影响[1--4]。微观结构是影响材料宏

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