矿物掺合料对混凝土抗硫酸镁侵蚀的有效性研究  

Study on resistance to magnesium sulfate attack on concrete containing mineral additive

作　　者：高礼雄[1] 文奔[1] 刘金革[1] 

机构地区：[1]石家庄铁道学院材料科学与工程分院,河北石家庄050043

出　　处：《混凝土》2007年第11期89-91,94,共4页Concrete

基　　金：国家"973"资助项目"高性能水泥制备和应用的基础研究"(2001CB610700)

摘　　要：以40 mm×40 mm×160 mm细碎石混凝土试件和20 mm×20 mm×20 mm水泥石试件进行试验。矿物掺合料取代水泥用量为0、10%、30%和50%。8个月浸泡试验表明,I级粉煤灰、矿渣、煤矸石等矿物掺合料对混凝土抗硫酸镁侵蚀性能的影响都存在着一个临界掺量,小于其临界掺量时掺合料对混凝土的抗硫酸镁侵蚀性能有改善作用,反之则有不利影响。机理分析表明掺合料一方面降低了Ca(OH)2从混凝土内部向其表面的扩散速度及混凝土表层Mg (OH)2薄膜的增厚速度,另一方面水泥石的孔结构随掺合料掺量的增大而改善。A series of concrete prisms（40 mm×40 mm×160 mm ）and pastes （20 mm×20 mm×20 mm） immersion tests were carried out respectively in the 10% MgSO4 solution and in water for 8 months.Mineral additive content in test specimens was kept at 0,10%,30% and 50% replacement of cement by mass.The results show that there is a critical content for fly ash,ground blast furnace slag and coal gangue to have an effect on the resistance to MgSO4 attack on concrete.When the content of mineral additives is less than their critical,mineral additives can improve the resistance to MgSO4 attack on concrete, or they decrease the resistance to MgSO4 attack and the law follows a two-order multinomial function.The effect above is also a collective result of decreasing Ca（ OH）2 and Mg（ OH ）2 contents and improving structure of cement paste by pozzuolanic reaction.

关 键 词：混凝土 矿物掺合料 硫酸镁侵蚀 强度降低 

分 类 号：TU528.41[建筑科学—建筑技术科学]