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Study of interfacial transition zones between magnesium phosphate cement and Portland cement concrete pavement

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The Portland cement concrete pavement(PCCP)often suffers from different environmental distresses and vehicle load failure,resulting in slab corner fractures,potholes,and other diseases.Rapid repair has become one of the effective ways to open traffic rapidly.In this study,a novel type of rapid repair material,basalt fiber reinforced polymer modified magnesium phosphate cement(BFPMPC),is used to rapidly repair PCCP.Notably,the mechanical properties and characteristics of the repair interfaces which are named interfacial transition zones(ITZs)formed by BFPMPC and cement concrete are focused on as a decisive factor for the performance of the rapid repair.The changing trend of the elastic moduli was studied by nanoindentation experiments in the ITZs with the decon-volution analysis that the elastic moduli of certain kinds of substances can be determined.The experimental results show that the elastic modulus of ITZ-1 with a width of about 20 µm can be regarded as 0.098 times of the aggregate,and 0.51 times of the ordinary Portland cement(OPC)mortar.The BFPMPC-OPC mortar ITZ has roughly the same me-chanical properties as the ITZ between aggregate and BFPMPC.A multi-scale representa-tive two-dimensional model was established by random aggregate and a two-dimensional extended finite element method(XFEM)to study the mechanical properties of the repair interface.The simulation results show that the ITZ formed by the interface of BFPMPC and OPC mortar and basalt aggregate is the most vulnerable to failure,which is consistent with the nano-indentation experimental results.

Portland cement concrete pavementInterfacial transition zoneMagnesium phosphate cementRepair interfaceNanoindentationMechanical properties and characteristics

Fei Liu、Baofeng Pan、Changjun Zhou、Ge Li、Xiaocun Wang、Jiaquan Li

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Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China

Tongren City Transportation Bureau,Tongren 554300,China

Beijing Civil Aviation Design and Research Institute of China Design Group,Beijing 101318,China

Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central UniversitiesNational Natural Science Foundation of ChinaResearch Center of Civil Aviation Airport Safety and Operation Engineering Technology

DUT20JC50DUT17RC300651508137KFKT2021-01

2024

10.1016/j.jtte.2022.06.009

交通运输工程学报(英文版)

交通运输工程学报(英文版)

CSTPCD
ISSN：2095-7564
年,卷(期)：2024.11(3)