Study On The Theory Of Glass Fibre Strengthen Pitch Concrete Mixture Design And Mechanics Performance

Along with the development of China's national economy, road traffic and the rapid increase, especially heavy vehicles and the increase in tire pressure, as well as the increase in traffic flow and drainage, road rutting is becoming increasingly serious, important in the road, particularly on the truck Lane, urban road intersections, bus stations and other parts of the track are very common. Rut not only affect the comfort of the journey, but also seriously threaten the safety of the road, how to prevent and deal with rutting has become China's highway construction in the important issues. The life of the asphalt pavement and the quality of service has great impact. Therefore systematic study on the life of asphalt pavement rutting resistance is the key. An objective evaluation of how the asphalt mixture at ambient temperature stability is an important issue currently facing.It is well known asphalt mixture is a typical example of viscoelastic material, the deformation of asphalt mixture with the load and the length of time different. Asphalt mixture load (stress) with the strain of the length of time is different. In other words, under constant stress and strain changes with time growing role in the constant strain, stress change with the passage of time has been decreasing at the time long enough to stabilize. Creep test is to study the viscoelastic material important experimental methods can be derived through the creep experiments in the role under constant stress, strain and the changes of time. In the field under different temperatures on the asphalt mixture to creep experiment, it could be in the field at different temperatures under strain and the changes of temperature. So on the asphalt mixture for viscoelastic studies; the highway asphalt mixture for further development, road safety is of great significance. Domestic and foreign scholars on the asphalt mixture mechanical properties of a large number of studies, Zhongzhihai , etc were researched viscoelastic parameters and methods for the determination, made no direct tensile test to determine the asphalt all the viscoelastic, and According to the Burgers model viscoelastic model parameters of methods. Guonaisheng, etc were studied on concrete creep properties. After its entry into the fiber to the asphalt concrete creep characteristics are improved. Creep deformation changes with the fiber content decreases after the first show of increasing fiber content of 0.2℅, creep deformation to a minimum, by calculating the rebound after unloading modulus of the fiber by adding asphalt concrete Resilient Modulus of money higher than ordinary asphalt concrete, but with the resilient modulus of the fiber by adding first increase and then decrease in the fiber content of 0.2℅ obtaining maximum. Shaolageng, etc were studied direct tensile test of the asphalt mixture injury viscoelastic properties. Through different temperatures, such as strain rate tensile test directly, that the temperature of asphalt mixture significant effect. High temperature, strain into effect more obvious at lower temperatures, the stress of damage. Temperature reached 40 in the asphalt mixture, the tensile modulus of light displacement factor in determining asphalt mixture under various temperature tensile modulus of the cluster. We got a kind of asphalt mixture visco-elastic continuum damage model. Zhengjianlong, etc mixture viscoelastic parameters and the application of research, such as the closure Motoyoshi asphalt mixture viscoelastic parameters method to carry out research to visco-elasticity theory Burgers model used directly tensile test of the asphalt viscosity materials viscoelastic properties, to determine the viscoelastic parameters of the nonlinear model. We introduced the use of Spss statistics software for viscoelastic parameters. SBS modified bitumen mixture creep properties were studied by Wangqingyuan, etc. On the matrix asphalt mixture and SBS modified bitumen mixture to a different temperature and under uniaxial loading level static load creep experiments, analysis of the temperature and load levels on the asphalt mixture creep characteristics. High-temperature asphalt mixture properties were studied by Zhang Jian, etc. The foreign scholars Snell Inllrnational, etc and Didierresueur, etc study mixture to the mechanical properties.We have to an objective evaluation of asphalt mixture incorporation 0.2 percent of the creep characteristics of glass fiber for a new type of pavement materials visco-elastic parameters of this paper, for this purpose, use JTJF40-2004 "road asphalt pavement construction technical specifications" recommended by the AC - 13 fine-graded asphalt concrete in the area of value ratio, determined application of the Marshall fiber asphalt concrete asphalt in the best dosage. Asphalt Concrete fiber content for the mass of the 0.2℅.According to the "highway projects asphalt and asphalt mixture pilot order" (JTJ052-2000) of the Act molding pressure cylinder specimen processing method to process specimens. The diameter is 101.6 mm, the height is 65.17-66.76 mm. Creep test equipment for Japan's high-AG-WTA control electronic universal testing machine. Control plane with the stress and strain rate of increase and the stress and strain of maintaining a constant function. -30℃testing machine with a warm box -250℃environment, in accordance with need to select test temperature. Testing Machine longest range is 100 KN, the use of adjustable range to the greatest range of 1% (1 KN). Load transfer through the load cell and strain through machines contingency unit transfer, displacement through the optical encoder transfer. At home and abroad adopted by the creep stress relaxation test methods contained mainly static uniaxial (uniaxial compression) and the most representative bending creep, the use of uniaxial compression test methods creep test. In the field at different temperatures under the test sample, test temperature environment inside insulation under 24 hours. Pre-test sample before and 0.0309 MPa stress, and maintain 10 minutes after pretreatment experiment.Samples were placed in each group will test machine table, in order to prevent friction specimen face the impact of a test specimen at both ends of the pad a PTFE film.Samples were placed in each group will test machine table, is set up a computer program to record the formula for x-T, test temperature, respectively, the x-axis to stress, T-axis is time, the experiment to 0.01 KN / s Test speed imposed on the sample constant stress. Strain change with the passage of time rising, the time trial set for 7200s to 7200s automatic computer output data and curves for all. The group obtained the specimens creep curves, normalized creep function data and curves of the experimental data one unit linear regression analysis, normalization of function creep equation. Drew the following conclusions:Test results show that creep asphalt mixture at 7200s 20℃group of creep is 0.5188%, 40℃at 7200s Group of creep is 4.0496%, 60℃group creep of the 7200s 3.884%. Asphalt mixture incorporation 0.2% glass fiber 20℃Group Creep of 7200s is 0.71684%, 40℃group creep of the 7200s is 3.943%, 60℃group creep of the 7200s is 3.85%.Asphalt mixture incorporation 0.2% glass fiber 20℃group of more than at 7200s creep asphalt mixture group. Asphalt mixture incorporation 0.2% glass fiber 40℃group is less than 7200s creep asphalt mixture group, asphalt mixture of 0.2%-doped glass fiber 7200s 60℃group of creep and asphalt mixture creep 60℃group are nearly at 7200s.Asphalt mixture group of 40℃Group and 60℃group creeps at 7200s group are more than 20℃, 40℃group and 60℃group are nearly creep at 7200s. Asphalt mixture incorporation 0.2% glass fiber group of 40℃Group 60℃group creep at 7200s group are more than 20℃, 40℃group and 60℃group are nearly creep at 7200s.Creep curve visible from the asphalt mixture is a viscoelastic material, the strain in the constant stress under a function of time. In the instantaneous flexibility under constant stress, strain increase with the passage of time the rising faster in the first 600s, followed by slow strain increased to 7200s rose very slowly creep curve is a change in the index.