TA606 : Evaluation of mechanical properties of roller concrete pavement containing slag, rubber powder and recycled asphalt
Thesis > Central Library of Shahrood University > Civil & Architectural Engineering > MSc > 2021
Authors:
Milad Hajiebrahimi [Author], Sayyed Ali Hosseini[Supervisor]
Abstarct: Abstract Rolling concrete pavement is a sub-branch of rigid pavements. The most prominent features of these pavements are high strength in the early ages, high execution speed and lower construction cost than other concrete pavements.In this research, it has been tried to use recycled materials that cause environmental pollution such as recycled asphalt, smelting iron slag and rubber powder as a substitute for non-renewable natural resources of stone materials.The main purpose of the research is to provide a mixing design with features beyond the mixing design with natural materials. For this purpose, by combining alternative materials and covering the shortcomings of each alternative material with another alternative material, we achieved the desired mixing design.From the obtained results, it can be concluded that 100% recycled asphalt can be replaced with coarse natural materials. Slag has a completely positive effect on the results and replacing it with natural materials is beneficial.Rubber powder can be replaced with fine-grained materials up to 20% and does not reach the minimum compressive and flexural strength in higher percentages. The negative effect of rubber powder on the performance of roller concrete mixtures can be compensated by increasing the percentage of slag and we can use this discarded material as a rock material along with slag. Therefore, by combining these three alternative materials, we try to achieve the final mixing plan with the highest possible percentage of alternative materials using the existing materials in Shahroud city. The results of compressive strength, flexural strength and indirect tensile strength tests showed that by replacing 100% recycled asphalt, we see a decrease of 17.68% and 15.91% in indirect compressive and tensile strength and a 26% increase in flexural strength. Also, with the replacement of 20% rubber powder, 28.3% and 58.27% decrease in compressive strength and indirect tensile strength and 3.45% increase in flexural strength occurred. In contrast to these two wastes, slag due to replacement with 100% natural coarse aggregates had 56% and 4.5% increase in compressive strength and indirect tensile strength and 2.46% decrease in flexural strength. We partially compensated for the weakness in rubber powder with a combination of rubber powder and slag, as well as a combination of rubber powder and recycled asphalt. baxsed on this, we have achieved two optimal mixing designs of 100% recycled asphalt with 30% rubber powder and also 100% slag with 15% rubber powder that can be used in the rolling concrete mixing design. Finally, the triple combination of 100% recycled asphalt - 25% slag and 10% rubber powder as a sample with all three alternative materials can be suggested for the use of waste in the mixing design.
Keywords:
#Roller concrete pavement #Optimal mixing design #Recycle materials #Recycle asphalt #Rubber powder #Furnace slag Keeping place: Central Library of Shahrood University
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