چكيده به لاتين
One of the major causes of road accidents in concrete pavements is the lack of sufficient friction between the surface of the pavement and the tires of vehicles, especially in rainy conditions. The amount of friction on a pavement surface indicates the amount of pavement safety. One of the influencing factors on skid resistance is micro and macro texture. For the life span of a pavement, the surface of the pavement must have sufficient roughness to provide friction between the vehicle's tire and the pavement.If a concrete pavement has a sufficiently slippery surface texture, it must be able to withstand abrasive factors such as traffic flow to maintain pavement safety for an acceptable period of time.
The main objective of this study experimental and analytical study of the effect of nano, micro and macro siliceous particles on abrasion and skid resistance of cementitious base pavements. In the first part of the study, after presenting the results of the compressive strength test and the microstructural properties of the concrete, including pore distribution and pozzolanic activity, to interpret the results, the skid resistance of the mortar and concrete samples with a water-cement ratio of 0.4 are performed. Also, since the abrasion resistance is the main factor in the durability of the surface slip resistance.
After examining the skid resistance of mortar and concrete containing nanoparticles, it is necessary to evaluate the wear resistance of these samples, in other words, the process of reducing the slip resistance of the samples. Then, to investigate the effect of fine-aggregate on the wear process of nanoparticle-containing samples, a comparison of concrete samples with different silica content is presented. Finally, the results of the effect of nanoparticle spray on the wear resistance of concrete are studied.
The results skid resistance showed that the nanoparticles did not have an acceptable effect on the improvement of surface texture and static friction and the presence of coarse grains in the concrete was the main factor in improving the skid resistance of the concrete samples compared to mortar. Concerning the results of abrasion resistance can also be obtained among different pore parameters in different size intervals, the large capillary pore volume has the most influence on the abrasion of the specimens. However, by changing the sand content and increasing the percentage of sand silica, the effect of pore volume on the abrasion of the sample decreases and aggregate abrasion determines the abrasion resistance of the specimens.
Concerning the spray of nanoparticles, the results also showed a positive effect of nanoparticles on the improvement of abrasion resistance at initial depths but with increasing number of abrasion cycles, the abrasion resistance decreased. The effect of nanoparticle penetration rate and its effect on abrasion resistance with Pozzolanic activity at different depths is investigated. Models and relationships were also presented to predict the wear resistance of the specimens based on concrete compressive strength and its contents.
