Interfacial Bonding Performance of BFRP Composite Cement Board and PUR Insulation Board

Abstract

Abstract: With the proposal of "dual carbon" goal, all kinds of new composite thermal insulation formwork and integrated composite wall have become the current research hotspot. A composite thermal insulation formwork with rigid polyurethane (PUR) insulation board as insulation layer and basalt fiber reinforced polymer (BFRP) composite cement board as surface layer was proposed. Six sets of specimens were designed for push-out shear test. The effects of groove type, depth and number on the interfacial bonding performance between surface layer and insulation layer were studied. The energy dissipation factor was introduced to evaluate the energy dissipation capacity of specimens. The results show that grooving on the insulation board, deepening the grooving depth and increasing the number of grooving can improve the interfacial bonding strength and toughness of the specimen. Comprehensive comparison of various working conditions, grooving on the surface of PUR insulation board can significantly improve the interfacial bonding performance of the specimen. The interfacial bonding performance of the transverse groove specimen is better than that of the longitudinal groove specimen. The "#"-shaped groove specimen makes that the interfacial bonding strength, toughness and energy dissipation capacity of specimen increase by 164%, 286% and 28.57%, respectively, compared with the unslotted specimen, showing the best interfacial bonding performance. Deepening the grooveing depth has limited improvement on the interfacial bonding performance and has little effect on the energy dissipation capacity. Increasing the number of grooving can improve the interfacial bonding performance of specimen by about 16%. Through regression analysis, the calculation formula ofinterfacial bonding strength was established, and compared with the experimental results, the calculated values are in good agreement with the experimental values.

Key words: composite thermal insulation formwork, BFRP, composite cement board, PUR, interfacial bonding performance, energy dissipation analysis

CLC Number:

TU528.58

SONG Xiaoruan, HUANG Song, GAO Rui, LUO Shili, GAO Yijing. Interfacial Bonding Performance of BFRP Composite Cement Board and PUR Insulation Board[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4323-4331.

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