水化硫铝酸钙和水化铝酸钙对内掺、外渗氯离子的固结机理及能力

Binding Mechanism and Capacity for AFm and C3AH6 on Premixed and Ingress Chlorides

为研究单硫型水化硫铝酸钙(AFm)和水化铝酸钙(C_(3)AH_(6))的Cl^(–)固结能力和机理,通过人工合成的方法采用C3A制备了高纯AFm与C_(3)AH_(6),并研究了内掺、外渗Cl^(-)条件下2种物质固结Cl^(-)后的产物类型、微观形貌、Cl^(-)固结量和固结率.结果表明:C_(3)AH_(6)对内掺Cl^(-)的固结能力(最高可达75%)远高于AFm(稳定约为17%),该差异在内掺Cl^(-)含量相对较低的情况下尤为显著;对比AFm,Cl^(-)与C3AH6的反应更迅速且更为彻底;C_(3)AH_(6)的固氯产物一致为Friedel盐,AFm则根据Cl^(-)浓度及其不同引入方式分为Hc、Kuzel盐、Friedel盐以及高硫型水化硫铝酸钙(Aft).

To investigate the binding capacity and mechanism of AFm and C_(3)AH_(6) with Cl^(-) ions,high purity AFm and CsAH were synthesized with C,A.The mineralogy and morphology of the products after reaction of AFm or C_(3)AH_(6) with premixed and ingress Cl^(-) ions,and the corresponding binding capacities were characterized.The results show that CAH has a higher Cl^(-) ions binding ability(i.e.,up to 75%)with premixed Cl^(-) ions than AFm(i.e.,17%),especially at a relatively low content of premixed Cl^(-) ions.A reaction between Cl^(-) ions and C_(3)AH_(6) is faster than that between Cl^(-) ions and AFm.The binding product generated by C_(3)AH_(6) is Friedel's salt,while those by AFm are Hc,Kuzel's salt,Friedel's salt and AFt,which depends on Cl^(-) ions concentration and its introduced manners,via premixed or ingress Cl^(-) ions.