RPC-NC叠合面剪切滑移试验研究

RPC(活性粉末混凝土)作为一种新型超高性能混凝土材料,具有高耐久性、高抗拉压强度及优异的变形能力。但由于其生产工艺相对复杂,制作成本相对较高,预制RPC构件多为实际工程所用。为了克服RPC在实际工程中应用的局限性,各种RPC组合构件应运而生,其中RPC与NC(普通混凝土)叠合构件即为一种有效的应用途径。然而,RPC-NC叠合构件叠合面的力学性能是决定两种材料是否能良好共同工作的关键因素。对36个RPC-NC双面剪切试件进行试验研究,考虑NC强度等级、叠合面正压力等级的影响,对试件破坏形态及剪应力与界面滑移量曲线进行分析。结果表明,无侧向压力试件界面抗剪强度随普通混凝土强度等级升高而增大;有侧向压力试件其抗剪强度随侧压力等级升高而大幅增加,但增加幅度逐渐减缓。

Experimental Study on Shear Slip of RPC-NC Composition Plane

As a new type of inorganic cementing material,Reactive Powder Concrete( RPC) has the performances of high tensile and compressive strength,long durability and excellent deformability.Precast RPC element is used in practical engineering because of its complex production process and high cost. RPC composite members are produced to overcome some of its limits in its practical application,while RPC and NC( normal concrete) composite member has proved to be an effective application. The mechanical behavior of the RPC and NC composite plane dominates the cooperating capability of these two materials. In this paper,36 double-sided shear specimens are test studied. In consideration of the grades of NC strength grade and composite plane normal pressure,the failure mode and shear stress-slip curve are analyzed. Results have shown that the shear strength of the composite plane increases with the increase of NC grade in condition of zero normal pressure; dramatic increase of shear strength occurs with applied normal pressure but the momentum of the increase gradually slows down with more pressure.