OPC-CSA复合修补材料的抗碳化性能研究

Research on Anti-Carbonation Performance of OPC-CSA Composite Repair Materials

为探究普通硅酸盐水泥(OPC)-硫铝酸盐水泥(CSA)复合体系修补材料是否具有良好的抗CO2侵蚀能力,将OPC和CSA按不同比例进行复配,研究其凝结时间、强度及抗碳化性能,以满足快速修补的特殊要求。采用X射线衍射仪分析加速碳化条件下各试样的水化产物,研究CSA对OPC抗碳化性能的影响机理。结果表明,标椎养护条件下,CSA掺量为15%时,OPC-CSA复合体系性能均较优;加速碳化作用下,随着CSA掺量增大,OPC-CSA复合体系的碳化深度逐步增大,抗碳化能力逐步减弱;碳化会降低复合体系的抗折强度和弯曲强度,提高复合体系的抗压强度;延长养护龄期会提高复合体系抵御碳化的能力。

To investigate whether the composite system of ordinary Portland cement(OPC)-calcium sulfoaluminate cement(CSA)has a good ability to resist CO2 erosion,OPC and CSA were mixed in different proportions to study the setting time,strength and anti-carbonation performance with the purpose of meeting the special requirements of quick repair.The hydration products of samples under accelerated carbonation were analyzed by XRD,and the effect mechanism of CSA on the anti-carbonation performance of OPC was studied.The results show that the OPC-CSA composite system has the best performance in all aspects when the CSA content is 15%in the standard curing condition.Under accelerated carbonation,the carbonation depth of the OPC-CSA composite system increases gradually with the increase of CSA content,and the anti-carbonation performance decreases gradually.Carbonation can reduce the flexural strength and bending strength of the composite system,but it can inhance the compressive strength of the composite system.Prolonging of curing age will improve the ability to resist carbonation of the composite system.