同一硫酸盐环境下地聚物混凝土与普通混凝土的耐蚀性能及机理分析

发布时间：2018-11-12 11:18

【摘要】：实验采用国家标准GB/T 50082-2009中推荐的混凝土抗硫酸盐侵蚀试验方法,将粉煤灰基地聚物混凝土(FGC)和普通混凝土(PCC)试样置于质量分数为5%的硫酸钠溶液中进行干湿循环侵蚀实验。以试样侵蚀后的结构形态变化、抗压强度损失、质量体积变化、动弹性模量变化为评价指标,并借助扫描电子显微镜(SEM)、X射线能谱(EDS)、电感耦合等离子体发射光谱(ICP-OES)等分析手段对FGC与PCC在同一硫酸盐侵蚀环境中的耐蚀性能、损伤机理以及两者间的相互影响进行了研究与分析。结果显示,随着侵蚀周期的增长两种混凝土的抗压强度和体积均表现出先降低后上升的趋势;二者的最大质量变化率均较小,FGC为0.3%,PCC为0.6%;二者的动弹性模量变化均较为复杂。微观观测发现影响FGC和PCC结构形态的关键物质分别是粉煤灰颗粒与膨胀性产物。化学分析表明FGC与PCC间产生相互影响的原因是材料各组分在侵蚀液中的溶解与渗透。
[Abstract]:The experiment adopts the method of sulphate corrosion resistance of concrete recommended by GB/T 50082-2009. The dry and wet cyclic erosion experiments of fly ash base polymer concrete (FGC) and ordinary concrete (PCC) in sodium sulfate solution (5% by mass fraction) were carried out. The structural morphology, loss of compressive strength, mass volume and dynamic modulus of elasticity of the specimen after erosion were taken as the evaluation index, and (EDS), was obtained by means of scanning electron microscope (SEM) (SEM), X ray spectrum. Inductively coupled plasma emission spectroscopy (ICP-OES) was used to study the corrosion resistance of FGC and PCC in the same sulphate environment, the damage mechanism and the interaction between them. The results show that the compressive strength and volume of the two kinds of concrete decrease first and then increase with the increase of the corrosion cycle, the maximum mass change rate of both is smaller, the FGC is 0.3% and 0.6%. The dynamic elastic modulus changes of both are more complex. It was found that the key substances affecting the structure and morphology of FGC and PCC were fly ash particles and expansive products, respectively. The chemical analysis shows that the interaction between FGC and PCC is due to the dissolution and permeation of each component of the material in the erosive solution.
【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】：国家自然科学基金(51208325) 能源工程与灾害力学教育部重点实验室开放基金(2013KF06)
【分类号】：TU528

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