中文摘要：

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。

英文摘要：

Fly ash based geopolymer concrete（FGC）and ordinary Portland cement concrete（PCC）were designed and tested in 5%solutions of sodium sulphate solution with dry-wet cycles according to preset national standard GB/T 50082-2009 to study their resistance to sulphate attack.The experimental results were assessed by the variations of structural morphology,compressive strength,dynamic elastic modulus,weight and volume.The microstructure of the specimens attacked by sulphates was also investigated using scanning electron micro-scope（SEM）,energy dispersive X-ray spectrometer（EDS）and inductively coupled plasma emission spectrometer（ICP-OES）techniques.The damage mechanism and interaction influence factors of FGC and PCC in the same erosion condition were analyzed and discussed.Results turned out that compressive strength and volume of FGC and PCC first decreased after rising trend.Weight changes were small：0.3% of FGC and 0.6% of PCC.The dynamic elastic modulus of both FGC and PCC were different and complicated.Meanwhile,microscopic observation show that the key factors affecting the structure form of FGC and PCC are fly ash particles and swelling products,respectively.Chemical analysis showed that the basis of mutual influence between FGC and PCC is the composition of dissolved and infiltration in sulfate solution.