As the inflation of domestic thermal power plants, the amount of coal ash is increasing significantly. If coal ash is not managed and recycled, there will be serious problems due to the short storage space of waste and potential impact to the environment. To resolve this problem, there is need to re...
As the inflation of domestic thermal power plants, the amount of coal ash is increasing significantly. If coal ash is not managed and recycled, there will be serious problems due to the short storage space of waste and potential impact to the environment. To resolve this problem, there is need to recycle the policy of using by-product recycling as construction materials. Therefore, the mechanical investigation was conducted in this research to determine the availability of utilizing bottom ash as asphalt concrete layer.
In this study, asphalt concrete mix design was conducted with various bottom ash(BA) content (10%, 20% and 30%) as replacement for fine aggregate. To evaluate the possibility of using the bottom ash as fine aggregate of asphalt mixture, domestic and foreign guidelines were used and the following results were obtained. As the result of the soundness of Aggregates test, the larger the particle size, the larger the difference in mass before and after the test. The soundness of aggregate of both bottom ash and control fine aggregate are lower than 15 which meet the criteria. Through the leaching test, the heavy metal content of bottom ash is lower than that of the designated waste harmful substance standard, so it does not have impact on the environment. Marshall mix design results exhibit that the optimum asphalt content of the control asphalt mix was equal to that of the 10 % bottom ash content mix. However, more than 10% bottom ash content will lead to the increase in asphalt content. Considering the economical aspect, it is reasonable to use 10% of BA as fine aggregate to the asphalt pavement. Thus, moisture sensitive resistance, fatigue cracking and plastic deformation resistance were conducted by comparing control asphalt mixture with bottom ash 10% asphalt mixture. To evaluate the potential of moisture damage to mixtures, moisture susceptibility test was performed according to AASHTO T 283. From Tensile Strength Ratio(TSR) result, the strength and TSR of asphalt mixture containing bottom ash were relatively higher than Control asphalt mixture. Hence, it shows that bottom ash has ability to improve the moisture resistance sensitive. The fatigue crack test was conducted by using the repeated indirect tensile test method(ASTM D6931). Test results indicate that fatigue cracking resistance of asphalt mixtures using bottom ash appears to be larger than that of control asphalt mixture. Therefore, it can be concluded that Asphalt mixtures containing 10% BA enhance fatigue crack resistance. Regards to the plastic deformation test, the performance of the asphalt mixture was evaluated by using a Hamburg wheel-tracking test. Hamburg wheel-tracking test performed in accordance with ASHTO T 324.Accordingly, The stripping point does not occur in mixture 10% BA whereas it occurred after 2500 passes in control specimens. As the results, the resistance of plastic deformation and stripping of asphalt mixture can be fortified by the bottom ash.
Based on this research, maximum 10% of BA is recommended as fine aggregates in asphalt mixture.
As the inflation of domestic thermal power plants, the amount of coal ash is increasing significantly. If coal ash is not managed and recycled, there will be serious problems due to the short storage space of waste and potential impact to the environment. To resolve this problem, there is need to recycle the policy of using by-product recycling as construction materials. Therefore, the mechanical investigation was conducted in this research to determine the availability of utilizing bottom ash as asphalt concrete layer.
In this study, asphalt concrete mix design was conducted with various bottom ash(BA) content (10%, 20% and 30%) as replacement for fine aggregate. To evaluate the possibility of using the bottom ash as fine aggregate of asphalt mixture, domestic and foreign guidelines were used and the following results were obtained. As the result of the soundness of Aggregates test, the larger the particle size, the larger the difference in mass before and after the test. The soundness of aggregate of both bottom ash and control fine aggregate are lower than 15 which meet the criteria. Through the leaching test, the heavy metal content of bottom ash is lower than that of the designated waste harmful substance standard, so it does not have impact on the environment. Marshall mix design results exhibit that the optimum asphalt content of the control asphalt mix was equal to that of the 10 % bottom ash content mix. However, more than 10% bottom ash content will lead to the increase in asphalt content. Considering the economical aspect, it is reasonable to use 10% of BA as fine aggregate to the asphalt pavement. Thus, moisture sensitive resistance, fatigue cracking and plastic deformation resistance were conducted by comparing control asphalt mixture with bottom ash 10% asphalt mixture. To evaluate the potential of moisture damage to mixtures, moisture susceptibility test was performed according to AASHTO T 283. From Tensile Strength Ratio(TSR) result, the strength and TSR of asphalt mixture containing bottom ash were relatively higher than Control asphalt mixture. Hence, it shows that bottom ash has ability to improve the moisture resistance sensitive. The fatigue crack test was conducted by using the repeated indirect tensile test method(ASTM D6931). Test results indicate that fatigue cracking resistance of asphalt mixtures using bottom ash appears to be larger than that of control asphalt mixture. Therefore, it can be concluded that Asphalt mixtures containing 10% BA enhance fatigue crack resistance. Regards to the plastic deformation test, the performance of the asphalt mixture was evaluated by using a Hamburg wheel-tracking test. Hamburg wheel-tracking test performed in accordance with ASHTO T 324.Accordingly, The stripping point does not occur in mixture 10% BA whereas it occurred after 2500 passes in control specimens. As the results, the resistance of plastic deformation and stripping of asphalt mixture can be fortified by the bottom ash.
Based on this research, maximum 10% of BA is recommended as fine aggregates in asphalt mixture.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.