基于合成纤维的混凝土制备及力学性能研究

Experimental Study on The Influence of Synthetic Fiber on the Performance of Bridge Concrete

为探究合成纤维对桥梁用混凝土性能的影响,采用试验对比的方式,以粉煤灰、PP合成纤维等作为原材料对纤维混凝土进行制备,并分别探讨在不同大小纤维下混凝土的坍落度、抗压强度、劈拉强度及弯拉强度等。试验结果表明,合成纤维能够有效增加混凝土的粘稠度,对坍落性能有优化作用;同时纤维混凝土抗压强度和弯拉强度稍弱于纯混凝土试块,但抗压韧性、劈拉性能及弯拉韧性明显优于纯混凝土试块;达极限载荷后,并未出现脆性断裂,结构保持较为完整,适用于桥梁建筑。

In order explore the influence of synthetic fiber on the performance of bridge concrete,this paper uses fly ash and PP synthetic fiber as raw materials to prepare fiber concrete,and discusses the slump,compressive strength,splitting tensile strength and flexural tensile strength of concrete under different fibers.The test results show that synthetic fiber can effectively increase the viscosity of concrete and optimize the slump performance;At the same time,the compressive strength and flexural strength of fiber concrete are slightly weaker than those of pure concrete block,but the compressive toughness,splitting tensile performance and flexural tensile toughness are obviously better than those of pure concrete block.After reaching the ultimate load,there is no brittle fracture,and the structure remains relatively complete,it is suitable for bridge construction.