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（1 南京航空航天大學(xué)航空宇航學(xué)院， 南京 210016； 2 鹽城工學(xué)院土木工程學(xué)院， 鹽城 224051）

［摘要］以雙面剪切試驗(yàn)研究磷酸鉀鎂水泥（MKPC）砂漿與舊混凝土粘結(jié)抗剪性能，試驗(yàn)變化因素包括鋼絲刷清洗浮灰、機(jī)械鑿毛去浮漿、人工鑿毛等三種舊混凝土表面處理方式，以及MKPC凈漿銷栓、加筋MKPC銷栓和鋼筋銷栓三種植筋加固方法，對比分析各組試件的界面粘結(jié)抗剪強(qiáng)度和剪切破壞形貌。結(jié)果表明，對舊混凝土表面進(jìn)行人工鑿毛并露出骨料能較大幅度地提高界面粘結(jié)抗剪強(qiáng)度；加筋MKPC銷栓能明顯提高界面粘結(jié)抗剪強(qiáng)度，其效果接近于鋼筋銷栓，并具有明顯的可操作性和經(jīng)濟(jì)性。

［關(guān)鍵詞］磷酸鉀鎂水泥砂漿； 剪切強(qiáng)度； 銷栓； 界面處理

中圖分類號(hào)：TU528文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)04-0035-04

Experimental study on shearing bonding behavior between magnesium potassium phosphate cement mortar and concrete

Du Yubing1,2, Cao Dewan2, Xun Yong2, Yang Jianming2, Gao Peiwei1

(1 College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; 

2 Department of Civil Engineering, Yancheng Institute of Technology, Yancheng 224051, China)

Abstract:Shear bonding behavior between magnesium potassium phosphate cement (MKPC) mortar and old concrete is studied by double shear experiment. The influence factors include three kinds of old concrete surface treatment such as cleaning dirt by steel wire brush, mechanical chiseling to eliminate laitance and manual chiseling as well as three kinds of reinforcement methods such as MKPC paste pin, reinforced MKPC pin and reinforcement dowel bar. The interfacial  shear bonding strength and shear failure morphology of each specimen were compared and analyzed. Results show that, interfacial  shear bonding strength can be greatly improved by manual chiseling to expose aggregate on the surface of old concrete. The reinforced MKPC pin can obviously improve the interfacial  shear bonding strength, the effect is close to the rebar pin, and has obvious operability and economy.

Keywords:potassium magnesium phosphate cement mortar; shear strength; dowel; interface processing

*國家自然科學(xué)基金項(xiàng)目（51478408，51578475），住房和城鄉(xiāng)建設(shè)部研究項(xiàng)目（2013-K4-41），江蘇省科技廳產(chǎn)學(xué)研聯(lián)合創(chuàng)新基金項(xiàng)目（BY2013057-05）。

作者簡介：杜玉兵，博士研究生，副教授，Email：duyubing@126.com。