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本文主要研究了纤维间距改变对界面层的影响。结果表明,当纤维间距大于或等于两倍界面层厚度时,界面层将保持自身性状,互无干扰和影响;当纤维间距小于两倍界面层厚度时,由于界面层间互相交错、搭接,并引起离子浓度变化,从而产生叠加效应(纤维与集料间也有同样的规律性)。这在一定程度上使界面层弱谷变浅,H_y-d曲线变平,界面及其最薄弱层得到强化。由于这些原因,当纤维间距大于或等于两倍界面层厚度时的主要界面力学行为——界面平均粘结强度、界面粘结刚度、纤维脱粘与拔出时所做的功,概不受纤维间距改变的影响。反之,只要混合料满足工作性能要求,诸界面力学行为均有不同程度的提高。乱向短纤维,尤其是乱向微细短纤维增强水泥基材,由于水泥基材中纤维及其界面层是三维乱向随机分布,界面层的叠加效应尤为显著。
This paper mainly studies the effect of fiber spacing on the interface layer. The results show that when the fiber spacing is greater than or equal to twice the thickness of the interfacial layer, the interfacial layer will maintain its own characteristics without interference and influence; when the interfiber spacing is less than twice the thickness of the interfacial layer, the interfacial layers are interlaced and overlapped. It also causes changes in ion concentration, resulting in additive effects (the same regularity between fiber and aggregate). This makes the weak layer of the interface layer shallow, the H_y-d curve flattened, and the interface and its weakest layer strengthened. For these reasons, the main interfacial mechanical behavior when the fiber spacing is greater than or equal to twice the interfacial layer thickness—the interface average bond strength, the interfacial bond stiffness, the fiber debonding, and the work done when pulled out, are not affected by the fiber. The effect of spacing changes. On the contrary, as long as the mixture meets the performance requirements, the mechanical behavior of all interfaces is improved to varying degrees. The chaotic short fiber, especially the chaotic microfiber-reinforced cement substrate, has a three-dimensional chaotic random distribution of the fiber and its interface layer in the cement substrate. The superposition effect of the interfacial layer is particularly significant.