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- W4361027150 startingPage "131137" @default.
- W4361027150 abstract "Some road and bridge projects to be repaired require materials that can quickly and easily obtain high mechanical properties. Added early strength agents are commonly used to improve the early strength of Ultra-high performance concrete (UHPC). Previous studies focused primarily on improving the early strength of UHPC, and few studies on how to reduce early age shrinkage of UHPC. This paper selected two inorganic early-strength agents, lithium carbonate (Li2CO3), nano-calcium carbonate (NC), and two organic early-strength agents, calcium formate(CF), triethanolamine(TEA),and an CaO expansion agent, which are commonly used. Experimental studies were carried out for single and compound early-strength agent systems in a cement-based UHPC system. The results showed three early-strength agents (NC, Li2CO3,CF) reduced the setting time and improved the early-strength of the UHPC. TEA had an adverse effect in the both single and compound systems. The 1-d compressive strength of the group(L0.15N3P10) reaches 84.5 MPa, with good workability and lower shrinkage. It can be used to prepare early strength ultra-high performance concrete (ES-UHPC) at room temperature. In terms of strength, shrinkage, and workability, it is suggested that the combination content of Li2CO3 is 0.15%, NC is 3%, and the expansion agent is 10% for fast repair and reinforcement projects." @default.
- W4361027150 created "2023-03-30" @default.
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- W4361027150 date "2023-05-01" @default.
- W4361027150 modified "2023-10-18" @default.
- W4361027150 title "Study on mechanical and shrinkage properties of ES-UHPC" @default.
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- W4361027150 doi "https://doi.org/10.1016/j.conbuildmat.2023.131137" @default.
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