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Influence Mechanism of Curing Regimes on Interfacial Transition Zone of Lightweight Ultra-High Performance Concrete

查看全文 作　　者：[1,4]李洋;[1]张高展;YANG [1]Jun;ZHANG [2]Jian;DING [3]Qingjun;ZHAO [5]Mingyu 高影响力作者 机构地区：[1]Advanced Building Materials Key Laboratory of Anhui Province,Anhui Jianzhu University,Hefei 230022,China;[2]Anhui Construction Engineering Building Materials Co.,Ltd,Hefei 230001,China;[3]State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;[4]Anhui Survey&Design Institute of Water Resources&Hydropower Co.Ltd,Hefei 230001,China;[5]School of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang 110168,China高影响力机构 出　　处：《Journal of Wuhan University of Technology(Materials Science)》索引2023年第38卷第3期,共13页高影响力期刊 基　　金：Funded by the National Natural Science Foundation of China (Nos.U21A20149, 51878003, 51908378);Research Reserve of Anhui Jianzhu University (No.2022XMK01);Excellent Scientific Research and Innovation Team in Colleges and Universities of Anhui Province(No. 2022AH010017)。 摘　　要：This study aims to clarify the effects of curing regimes and lightweight aggregate(LWA)on the morphology, width and mechanical properties of the interfacial transition zone(ITZ) of ultra-high performance concrete(UHPC), and provide reference for the selection of lightweight ultra-high performance concrete(L-UHPC) curing regimes and the pre-wetting degree LWA. The results show that, under the three curing regimes(standard curing, steam curing and autoclaved curing), LWA is tightly bound to the matrix without obvious boundaries. ITZ width increases with the water absorption of LWA and decreases with increasing curing temperature. The ITZ microhardness is the highest when water absorption is 3%, and the microhardness value is more stable with the distance from LWA. Steam and autoclaved curing increase ITZ microhardness compared to standard curing. As LWA pre-wetting and curing temperatures increase, the degree of hydration at the ITZ increases, generating high-density CSH(HD CSH) and ultra-high-density CSH(UHD CSH), and reducing unhydrated particles in ITZ. ITZ micro-mechanical properties are optimized due to hydration products being denser. 关 键 词：curing regime ultra-high performance concrete lightweight aggregate interfacial transition zone meso-mechanical properties micro-mechanical properties
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