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(1 廣東省建筑設(shè)計(jì)研究院有限公司， 廣州 510010；2 湖南大學(xué)風(fēng)工程與橋梁工程湖南省重點(diǎn)實(shí)驗(yàn)室， 長沙 410082)

［摘要］超高性能混凝土（UHPC）由于其優(yōu)異的力學(xué)性能和超強(qiáng)的耐久性，非常適用于損傷普通混凝土（NC）結(jié)構(gòu)的修復(fù)加固。UHPC-NC界面的抗剪性能是保證UHPC修復(fù)NC結(jié)構(gòu)獲得良好力學(xué)和抗?jié)B性能的重要因素。通過7組抗剪推出試驗(yàn)，評(píng)估了NC界面光滑、鑿毛、露筋、刻槽、鉆孔和植筋等不同界面處理的UHPC-NC界面抗剪性能和破壞模式。試驗(yàn)結(jié)果表明，UHPC-NC界面具有良好的抗剪粘結(jié)性能，界面抗剪強(qiáng)度隨著NC界面粗糙度的增加而增大，NC界面采用鑿毛或刻槽處理的UHPC-NC界面獲得了最佳的抗剪承載力，界面破壞方式基本為NC剪切破壞或界面+NC破壞兩種模式，未出現(xiàn)完全的界面剝離破壞；光滑和鑿毛界面的抗剪破壞為脆性破壞；露筋和鉆孔界面的抗剪破壞介于延性破壞和脆性破壞之間，植筋和刻槽界面的延性較好。 

［關(guān)鍵詞］超高性能混凝土；普通混凝土；界面抗剪性能；推出試驗(yàn) 

中圖分類號(hào)：TU375 文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)14-0101-06

Experimental study on the interface shear performance of ultra-high performance concrete and normal concrete 

RAO  Xinpin1,  HUO  Wenbin1,  HU  Zhimin1,  ZHANG  Yang2 

(1 Guangdong Architectural Design & Research Institute Co.,Ltd., Guangzhou 510010， China；2 Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha 410082，China) 

Abstract: Ultra-high performance concrete (UHPC) is very suitable for the repair and reinforcement of damaged normal concrete (NC) structures due to its excellent mechanical properties and superior durability. The shear resistance of UHPC-NC interface is important factor to enhance the mechanical properties and the impermeability of concrete structures repaired by UHPC. Seven sets of shear push-out tests were conducted to evaluate the shear resistance and failure models of different UHPC-NC interface treatments, including smooth, chiseling, rebar exposing, grooving, drilling, and rebar bonding. The experimental results show that the interface between UHPC-NC interface has good shear bonding properties, and its shear strength increases with the increase in roughness of NC surface. The UHPC-NC interfaces with the treatments of roughness or grooving on NC surface obtains the best shear resistance, and their failure modes are basically NC shear failure and interface + NC failure modes, and the complete interface peeling failure are not observed. The shear failures of the interfaces with treatments of smooth or chiseling are brittle shear failures. The shear failures of the interfaces with rebar exposing or drilling are between ductile failure and brittle failure, and the rebar bonding or grooving displays good ductility. 

Keywords:ultra-high performance concrete； normal concrete； interface shear resistance； push-out test

*廣州市產(chǎn)業(yè)技術(shù)重大攻關(guān)計(jì)劃項(xiàng)目（201902010019），湖南省交通廳科技創(chuàng)新項(xiàng)目（201714）。

 作者簡介：饒欣頻，碩士，高級(jí)工程師，Email：68772530@qq.com。