橡胶颗粒水泥混凝土与基质混凝土路用性能对比分析

Analysis of road performance between rub-concrete and general concrete materials

为改善路用水泥混凝土变形能力差、韧性小等传统缺陷,在混凝土中加入橡胶颗粒形成橡胶颗粒混凝土;对橡胶颗粒混凝土与普通混凝土的弯拉模量进行对比分析,采用有限元的方法分析两种混凝土的阻尼变化,采用三点弯曲小梁试验对两种混凝土的疲劳性能进行对比试验,采用车辙试验方法验证橡胶颗粒混凝土的抗剥蚀性能;根据试验取得的力学参数,应用AASHTO的MEPDG2002设计方法,预测两种混凝土路面在设计年限末期的路面破损状态.结果表明:橡胶颗粒水泥混凝土抗折强度下降3%,弯拉模量比普通水泥混凝土降低了12%,阻尼比提高了30%,疲劳寿命有大幅度提高,而且并没有发生表面剥蚀现象,橡胶水泥混凝土面板的断板率与普通混凝土相比降低了30%,路面的平整度好.橡胶颗粒混凝土路面能克服传统水泥路面的缺陷,具有优良的路用性能.

In order to improve road cement concrete deformation and small toughness traditional defects,rubber grain was mixed into concrete to form the rubber particles concrete; flexural modulus of rubber particles of concrete and ordinary concrete was comparative studied,two kinds of concrete damping change was analyzed by using the finite element,through three point concrete trabecular bending test,the fatigue properties were comparative researched,the rutting test methods were used in proving the rubber particles of concrete of erosion performance.According to the mechanical parameters of acquired in experiments,adopted the MEPDG 2002 design method,the road surface damage states were fore-casted of the two kinds of concrete pavement in the end period of design. Study results show that rubber particles cement concrete flexural modulus reduced by 12% than that of ordinary cement concrete,the damping ratio increased by 30%,the fatigue life have greatly improved,and surface erosion phenomenon did not happen,the rubber cement concrete slabs breakage was lower 30% than ordinary concrete.Therefore,the rubber particles concrete slabs can overcome the traditional defects of cement concrete pavement and with has excellent road performance.