纤维编织网增强ECC的拉伸和弯曲力学性能

Tensile and Bending Mechanical Performance of Textile Reinforced ECC

摘要:

通过拉伸和四点弯曲试验，研究了纤维编织网的层数和种类、纤维编织网表面处理、PVA纤维掺量对纤维编织网增强ECC拉伸和弯曲力学性能的影响。试验结果表明，和单层网TRE试件相比，双层网TRE试件的极限拉应力提高了将近1倍，极限弯拉荷载从单层网试件的0.73kN增大到1.62kN，极限抗拉强度和极限弯拉强度明显提高，刚度增大。与碳纤维-玻璃纤维混编网TRE试件相比，玄武岩纤维-玻璃纤维混编网TRE试件的拉伸和弯曲力学性能较低。将碳纤维-玻璃纤维混编网表面进行浸胶黏砂处理后，TRE试件的极限抗拉强度和极限弯拉强度呈降低趋势，但极限拉伸变形和极限跨中挠度增大。此外，当PVA纤维掺量从1%增加到2%，TRE试件的极限拉应力从4.15MPa增大为7.05MPa，弯曲开裂荷载变大，试件的拉伸和弯曲性能提高。

Abstract:

Through tensile and four-point bending tests, the effects of the number and types of textile, the coating treatments of textile, and the content of PVA fibers on the tensile and bending mechanical properties of textile reinforced engineered cementitious composites (TRE) were studied. The test results show that, compared with the single-layer textile TRE specimen, the ultimate tensile stress of the double-layer textile TRE specimen becomes nearly double, the ultimate bending load increases from 0.73KN to 1.62KN, the ultimate tensile strength and ultimate bending strength are significantly improved, and the rigidity is increased. Compared with carbon-glass textile reinforced TRE specimens, the tensile and bending mechanical properties of basalt-glass textile reinforced TRE specimens are lower. The ultimate tensile strength and ultimate bending strength of the TRE specimens showed a decreasing trend after the carbon-glass textile surface was impregnated by epoxy resin and covered with sand, but the ultimate tensile deformation and ultimate mid-span deflection increased. In addition, when the PVA fiber content is increased from 1% to 2%, the ultimate tensile stress increases from 4.15MPa to 7.05MPa, the bending cracking load of the TRE specimens is increased, the tensile and bending properties are improved.