快凝无机胶植筋锚固性能试验

基于目前有机胶普遍存在的弹性模量低、易老化、耐热性能差等问题，研制出一种高强快凝的新型无机胶。对该无机胶在水平面及竖直面混凝土基材上的植筋进行了拉拔试验，通过对比不同工况下的试验结果，探究了钢筋直径、混凝土强度、锚固深度以及植筋角度等因素对植筋锚固性能的影响。基于试验现象归纳了几种典型的破坏模式，并根据试验数据绘制了2种典型破坏模式的荷载 位移曲线，分析了植筋锚固的受力机理；从结构安全性和工程经济性角度出发，通过理论推导得出了锚固深度的近似计算公式，提出了一种简单而实用的植筋设计方法，将该方法应用于试验，并将得出的试验值与计算值进行了对比。结果表明:根据均匀剪切模型，28 d植筋试件的平均黏结强度可达19.65 MPa，甚至更高，超过《混凝土结构化学植筋技术规程》中A级胶所要求的黏结强度(11 MPa)；所提出的植筋设计方法适用于各种不同工况，其锚固深度理论计算值和试验值吻合较好，可应用于今后的植筋设计中。

Experiment on Anchorage Performance of Planting Rebar with Rapid-solidification Inorganic Adhesive

Based on the problems of low modulus of elasticity, easy aging and poor heat resistance of organic adhesives, a new type of inorganic adhesives with high strength and rapid solidification was developed. Through the pull out test of the planting rebar in the horizontal and vertical planes of concrete substrates with inorganic adhesive, and comparing the test results under different working conditions, the effects of rebar diameter, concrete strength, anchoring depth and the implanted angle on the anchorage performance of rebar planting were investigated. Several typical failure patterns were concluded based on the test phenomena, and according to the test data, the load displacement curves of two kinds of typical failure modes were drawn, the anchorage stress mechanism of planting rebar was analyzed. From the view of structural safety and engineering economy, an approximate formula for calculating anchorage depth was obtained through theoretical deduction, and a simple and practical design method for planting rebar was proposed. The method was applied to the test, and the theoretical calculation values and the test values were compared. The results show that on the basis of uniform shear model, the average bond strength of steel specimen after 28 d can reach 19.65 MPa or even higher, far more than the bond strength of A grade adhesive (11 MPa) which was proposed in Technical Regulation of Chemically planted Steel Bars in Concrete Structures. The proposed design method of planting rebar is applicable to various working conditions, and the theoretical calculation results of anchoring depth are in good agreement with the experimental values. The design method of planting rebar can be applied to the future design of planting rebar.