جستجوی مقالات مرتبط با کلیدواژه "روسازی بتنی درزدار" در نشریات گروه "عمران"

The addition of fibers with different physical and strength properties has different effects on the strength properties of jointed concrete pavements at rupture and also on the residual flexural strength of the pavement. This study investigates the separate and comparative effect of micro and macro synthetic fibers on the strength properties of jointed concrete pavements, considering the residual flexural strength of the pavement. For this purpose, the effect of adding two types of macro fibers and one type of micro fiber in the content of 1, 2, and 3 kg/m3 on compressive strength, splitting tensile strength, flexural strength, and flexural performance after cracking of concrete pavement were investigated. The results showed that micro fibers in all consumption contents have the least effect on the strength properties of pavement compared to macro fibers. Also, the addition of macro fibers did not have a significant effect on the compressive strength, but the splitting tensile strength, flexural strength, and residual flexural strength of pavement were significantly increased. The effect of macro fibers on improving the splitting tensile strength and modulus of rupture of pavement occurred at dosage rates higher than 2 kg/m3. However, the most significant increase in the equivalent flexural strength ratio of fiber reinforced concrete pavement occurred in the range of 1 to 2 kg/m3, and by adding higher contents of macro fibers, the increasing growth trend of residual flexural strength decreased. It was founded that macro fibers have the most excellent effect on flexural strength and residual flexural strength of the pavement. Also, the performance of twisted and continuously embossed macro fibers in all dosage rates was approximately the same.

One of the main reasons of surface texturing in concrete pavements is to provide a safe surface by supplying adequate surface friction which it could be furnished by different methods on fresh poured concrete. In this way, the hydroplaning and skidding on wet surface would be minimized. However, some other considerations such as safety, quality of driving, bumping noises and economical factor should be noticed. Required specifications should be controlled via width, depth and distance between grooves, amount of noises and grooves direction. In this paper, in order to monitor the surface texturing different classifications, texturing methods, surface properties and measuring methods have been discussed in accordance with American concrete pavement association (ACPA). Finally, different methods of surface texturing in Tehran-North highway are introduced and the results of English pendulum test on each method would be presented. The results indicate that texturing by TCM machine has better English pendulum value even in compare to asphalt overlay.