废弃玻璃纤维增强磷酸盐混凝土的力学性能研究

Study on mechanical properties of abandoned glass fiber reinforced phosphate concrete

以废弃玻璃纤维、磷酸盐、粉煤灰、砂骨料等材料为原料,制备了短纤维增强磷酸盐基混凝土。利用电子万能试验机和扫描电镜研究了混凝土的抗拉强度、抗压强度、抗弯强度等力学性能和混凝土中玻璃纤维的失效机制。结果表明,玻璃纤维增强磷酸盐基混凝土具有优异的力学性能;玻璃纤维长度为13 mm,体积分数为2%的混凝土抗压强度、抗拉强度和抗弯强度分别为56.6,2.96和10.1MPa,比未添加玻璃纤维的混凝土提高12.3%,46%和260%,力学性能和Portland水泥混凝土相当;玻璃纤维增强混凝土中纤维的失效机制为纤维断裂机制,而不是纤维拔出机制。

The short fiber reinforced phosphate concrete was prepared by using environment-friendly materials such as abandoned glass fiber,phosphate,fly ash and sand aggregate.The mechanical properties of concrete,such as tensile strength,compressive strength,flexural strength were studied by electronic universal testing machine.The failure mechanism of glass fiber in concrete was studied by scanning electron microscope.The results showed that glass fiber reinforced phosphate concrete had excellent mechanical properties.The fiber length was 13 mm.The compressive strength,tensile strength and bending strength of fiber reinforced concrete with a fiber volume fraction of 2% were 56.6,2.96 and 10.1 MPa,respectively,which increased by 12.3%,46% and260% compared with those of concrete without glass fiber.The mechanical properties were comparable to Portland cement concrete.The fiber failure mechanism of glass fiber reinforced concrete is the fiber fracture mechanism,not the fiber pulling mechanism.