PP/PVA Fiber Reinforced Sulphoaluminate Cement-Based Rapid Repair Material

Abstract

Abstract: With the increase of traffic pressure, the road surface of highways and bridges is prone to fatigue failure. In this paper, polypropylene (PP) fiber and polyvinyl alcohol (PVA) fiber are used to improve the properties of sulphoaluminate cement-based rapid repair material. The effects of single and compound PP and PVA fibers on fluidity, strength and toughness of sulphoaluminate cement-based rapid repair materials were investigated, and the effects of the optimal mixing ratio on the bonding strength and volume stability of the repair materials were also studied. The results show that the single PP fiber has little effect on the fluidity of mortar, and significantly improves the flexural strength. After adding 0.2% (volume fraction, the same below) PP fiber, the fluidity only decreases by 4%, and the 1 d and 28 d flexural strengths reach 12.8 MPa and 15.5 MPa, respectively. The single addition of PVA fiber significantly reduces the fluidity of mortar repair materials and enhances the compressive strength. The fluidity of mortar decreases by 21% with the addition of 0.2% PVA fiber, and the 1 d and 28 d compressive strength reach 56.6 MPa and 84.3 MPa, respectively. When the ratio of PP and PVA fibers is 3:1 and the total volume content is 0.2%, the two kinds of fibers play a synergistic role to make the quick repair material not only obtains good flow performance, strength, and toughness, but also improves the bonding performance and shrinkage characteristics of mortar. At 28 d, the mortar bonding strength reaches 5.6 MPa, and the drying shrinkage rate is 2.73×10^-4, which better meets the rapid repair needs of highways and bridges pavement and expansion joints.

Key words: rapid repair material, PP fiber, PVA fiber, sulphoaluminate cement, bonding performance, drying shrinkage

CLC Number:

TU528.31

ZHANG Chenglong, LIU Yi, ZHANG Ming. PP/PVA Fiber Reinforced Sulphoaluminate Cement-Based Rapid Repair Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2174-2183.

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