高强合成纤维混凝土机场道面接缝抗冲击性能

Research on the Impact Resistance of High Strength Synthetic Fiber Concrete at Airport Pavement Joint

针对高强合成纤维对机场道面接缝处的抗冲击性能改善作用进行了研究。研究中采用改制后的混凝土路面轮辙试验机进行轮式抗冲击试验,以混凝土脱落量来衡量其损伤程度。试验试件分为无错台和有错台2组,模拟机场道面接缝处的实际情况。结果表明:对于2组道面试件组,冲击荷载作用次数的增加均会导致混凝土脱落量的增加。对于无错台试件,1 000次冲击作用后,纤维掺量为1.4kg/m3的混凝土脱落量比普通混凝土减少51.1%。对于有错台试件,随着纤维掺量增加至1.4kg/m3,混凝土脱落量分别减少73.3%,72.5%,46.6%。这说明高强合成纤维掺量的增加可以有效减轻接缝两侧边角和错台边角的混凝土受冲击脱落现象,且改善效果越来越明显。

Researches on how to add the high strength synthetic fibers in the pavement concrete at the airport to improve its performance, and the impact resistance improvement of the high strength synthetic fibers at the airport pavement joints. The restructured concrete pavement rut testing machine is adopted to take the wheeled impact test in the study. Moreover, the shedding concrete quantity is used to measure the degree of injury. The test specimens are divided into two groups, i.e. specimens without staggered steps and with staggered steps. The actual situation of the airport pavement joint is simulated. The results show that as for the two test groups, an increase in the number of impact load will cause the increase of concrete weight loss. As for the specimens without staggered steps, after 1 000 times of impact, the amount of shedding concrete dropped by 1.4 kg/m^3 is 51.1% lower than that of ordinary concrete. For the specimens with staggered steps, the concrete shedding decreases by 73.3%, 72.5%, and 46.6% respectively with the increase of fiber content to 1.4 kg/m^3. The result shows that the increase of the synthetic fiber content can effectively reduce the shedding quantity of the joint angle and the angle at staggered steps, and the improvement effect is more and more obvious.