Preparation and Characterization of Calcium Sulfoaluminate Based Engineered Cementitious Composites for Rapid Repairing of Concrete Member

• Main Authors: Leyang Lv, Xin Hong, Zhu Ding, Xu Ma, Hongfeng Li
• Format: Article
• Language: English
• Published: Frontiers Media S.A. 2020-09-01
• Series: Frontiers in Materials
• Subjects: calcium sulfoaluminate cement (CSA); engineered cementitious composite (ECC); repairing agent; concrete member; UHMWPE fiber
• Online Access: https://www.frontiersin.org/article/10.3389/fmats.2020.00282/full

In this work, quick hardening and high early strength engineered cementitious composites (ECC) were developed by using calcium sulfoaluminate (CSA) cement as the matrix material. The optimal mix design of CSA-ECC was studied with emphasis on the fluidity and mechanical properties. It was found that CSA cement incorporated with 2% polycarboxylate-based superplasticizer (PSP), 1% ultra-high-molecular weight polyethylene (UHMWPE) fiber, and with cement to sand ratio of 0.5 shows the best performance in terms of fluidity, flexural strength, and compressive strength. The fracture energy, tensile strength, and strain capacity of CSA cement was significantly improved by proper mixing of UHMWPE fiber. After that, the performance of CSA-ECC in rapid repairing of concrete members was characterized. The experimental results suggest that the CSA-ECC has good bonding strength to the concrete matrix. Compared with plain concrete members, both flexural and compressive strength of concrete members were significantly reinforced after 1, 3, and 28 days when CEA-ECC was applied as rapid repairing coating.