早强型高延性水泥基复合材料的性能研究

Study on Performance of Early Strength High Ductility Cementitious Composite Materials

为了满足结构工程对修复材料提出的施工方式与开放时间、增韧、体积变形及抗冻融的实际需求,研究了高延性水泥基复合材料(HDCC)的凝结时间、拉伸-位移、劈裂抗拉、收缩及冻融性能的影响。结果表明,在保证早期强度发展的前提下,缓凝剂有效地延长了凝结时间从而保证其相应的施工时间,纤维的合理使用可提高HDCC的拉伸韧性与劈裂抗拉强度,而减缩剂与膨胀剂可将HDCC的收缩应变减小至200με以内,同时,新型HDCC还表现出良好的抗冻融特性。

In order to meet the practical requirements of construction methods and time,toughening,volume deformation and freeze-thaw resistance of repairing materials,the effects of setting time,tension-displacement,splitting tension,shrinkage and freeze-thaw resistance of high ductility cement-based composites(HDCC)were studied in this paper.The results show that,on the premise of guaranteeing the early strength development,the retarder effectively prolongs the setting time and guarantees the construction time.The reasonable use of fibers can improve the tensile toughness and splitting tensile strength of HDCC,while the shrinkage strain of HDCC can be reduced to less than 200μεby applying shrinkage reducing agent and expansion agent.At the same time,the new HDCC also shows good freeze-thaw resistance.