异型粗合成纤维与砂浆基体界面的粘结性能及其微观增强机理

Bond Properties and Micro-Mechanism of Interface Between Special-Shaped Synthetic Macro-Fiber and Mortar Matrix

通过自行研制的拉拔试验装置,试验研究了异型粗合成纤维与砂浆基体界面的粘结力及其影响因素。试验表明:在M 30砂浆中,纤维不同埋置长度的界面粘结强度基本为一常数3.70 M Pa,在M 20、M 40砂浆中,界面粘结强度随纤维埋置长度的增大而减少;对于同一纤维埋置长度,随砂浆强度增加,界面粘结强度不是一直在增加,有时在降低;同时,在作者以前提出的异型粗合成纤维拉拔理论模型的基础上,建立了一个与试验结果更吻合的新理论模型,该新模型对异型粗合成纤维与基体界面粘结性能的进一步深入研究具有较高的实用价值和理论意义。

With new type pull-out experimental equipment between shaped synthetic macro-fiber and mortar is tested in , the bonding force and its effect factors this paper. The results show that the interfacial bond strength of different embedding lengths in M30 mortar almost is a constant 3.70 MPa. However, in M20 or M40 mortar, it decreases with the fiber embedding length increased, when fiber embedding lengths are same, it doesn＇t increase and even decreases with the increase in strengths of matrix. Meantime, based on amending the old mechanical model for analysis of shaped synthetic macrofiber, a new mechanical model is first developed; a good agreement is achieved between the prediction and the experiment results, it has good practical and academic values for the research of interfacial bonding between shaped synthetic macro-fiber and matrix.