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

Leyang Lv,Zhu Ding,Xu Ma,Xin Hong,Hongfeng Li

doi:10.3389/fmats.2020.00282

Abstract

In this work, quick hardening and high early strength engineered cementitious composites (ECC) was developed by using calcium sulfoaluminate (CSA) cement as the matrix material. The optimal mix design of CSA-ECC was studied with emphasis on the properties of 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 shown 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 28d when CEA-ECC was applied as rapid repairing coating.

Highlights

Concrete is one of the world’s most widely used single artificial material (Moradi-Marani et al, 2010)
The results suggest that the prepared high early strength engineered cementitious composites (ECC) materials are capable of providing a compressive strength of 21 MPa within 4 h and tensile strain capacity of 2%
Flexural and Compressive Strength The flexural strength and compressive strength of the prepared calcium sulfoaluminate (CSA)-ECC material after 1, 3, and 28 days of curing was evaluated on 40 mm × 40 mm × 160 mm specimens according to the testing standard EN 196-1

Summary

INTRODUCTION

Concrete is one of the world’s most widely used single artificial material (Moradi-Marani et al, 2010). Li and Li (2011) took the lead in developing high early strength ECCs by incorporation of PVA fiber into CSA cement. Wang et al (2019) developed sulfoaluminate cement based ultra-high performance concrete (ES-UHPC) which uses steel fiber as reinforcement. The reinforcing performance of different types of fibers on the engineering properties of CSA cement-based concrete was evaluated (Afroughsabet et al, 2019). Based on the discussion above, the motivation of this work was to evaluate the potential of using CSA-ECC as a coating material for concrete element reinforcing and repairing. To this end, ultra-high-molecular weight polyethylene (UHMWPE) fibers was used to produce CSA-ECC materials. The scientific findings obtained in this study are considered to contribute to further study of prolonging the service life of existing concrete structure with satisfactory materials

MATERIALS AND METHODS

Mixing Procedure and Sample Preparation

RESULTS AND DISCUSSION

CONCLUSION

DATA AVAILABILITY STATEMENT