碳化钢纤维混凝土弯折性能的试验研究

Experimental Research on the Rupture Strength of Steel Fiber Reinforced Concrete under the Action of Carbonization

通过对43组129个100 mm×100 mm×100 mm的混凝土立方体试件进行试验研究,以钢纤维体积率、混凝土强度等级和碳化龄期为变量,研究了不同体积率、不同强度等级的钢纤维混凝土在不同碳化龄期下弯折性能的变化规律,探讨了钢纤维对混凝土抗折强度的影响机理.试验结果表明,混凝土基体强度等级较高时,随着碳化龄期和钢纤维体积率的提高,碳化后混凝土弯折性能改善比较显著,对基体强度等级为C30、体积率分别为1.0%和2.0%的钢纤维混凝土碳化3 d7、d1、4 d、28 d后,相对抗折强度分别为0.98,1.11,0.91,1.21和0.92,1.24,1.23,1.39.

Through the experimental research on the 129 concrete specimens with the size of 100 mm × 100 mm × 100 mm, the volume fraction of steel fiber, the grade of concrete strength and different carbonization time are taken as variable parameters. This paper studied the influence of the volume fraction of steel fiber, the grade of concrete strength and different carbonization time on the rupture strength of steel fiber reinforced concrete. Furthermore, the reinforced mechanism of the steel fiber reinforced concrete under the action of carbonization was discussed. The study results showed that when the grade of concrete strength is higher, it is more obvious for steel fiber to the rupture strength of steel fiber reinforced concrete.