Papers by Keyword: Modified Asphalt

Abstract: The use of asphalt in road construction remains a top choice in many countries due to its advantages in providing a smooth surface, resistance to vehicle loads, and weather resistance. The limited availability of oil asphalt (AMI) as a binding material for road pavement layers causes the price to be expensive. The need for asphalt for road construction (excluding maintenance) reaches 1.6 million tons/year. Therefore, various efforts have been made to suppress the use of AMIs. One of the currently used asphalt is Asbuton extraction modified asphalt (AMO). In this regard, the purpose of the study is: To analyze the performance of AC-BC mixtures using a combination of AMI and AMO with Marine Fuel Oil (MFO) and to determine the best proportion of AMI and AMO combinations for AC-BC mixtures. Experiments were conducted in a laboratory using the Marshall Method. The best proportion of AMO usage is sought by making 5 variations of AMI and AMO comparisons, namely 100%:0%, 75%:25%, 50%:50%, 25%:75%, 0%:100%. The results of the Performance of Modified Buton Asphalt with Marine Fuel Oil in Asphalt Pavement Mixtures research are 1) The use of AMO for AC-BC mixtures can be used up to a proportion of 50% to AMI, but above 50% is not eligible because the flow value is above 4%; 2) The best proportion is obtained at 50%AMI proportion: 50%AMO, with the highest stability for the range that meets the requirements. Recommendations for improving the results are experiments with varying proportions of AMO between 50% and 70% to identify more flexible tolerance limits and mixture adjustments that may allow the use of AMO in higher proportions. This includes research on modifying additives or other materials that may reduce the flow value.

Abstract: According to the relationship of the viscosity and temperature when the mixture reached Optimum compaction effect and the shear rate, the viscosity shear rate of the testing modified asphalt mixture, 60s-1 has been found. The test results show that the difference between the compaction temperature of the modified asphalt mixture and the compaction temperature under the condition of the best compaction effect is 5°C. It shows that the temperature is satisfied with the specific temperature during construction, so the determination method is workable.

Abstract: By comparing the study of 50# and 70# matrix asphalt and SBS modified asphalt to the influence law of high temperature performance, low temperature performance and water stability performance of ATB mixture, it can balance the relationship of the performance of every road in design method of ATB mixture. It suggests that we can use SBS modified asphalt in the condition of usually, use Low grade matrix asphalt or SBS modified asphalt in the condition of higher temperature requirements for the road , and use High grade matrix asphalt or SBS modified asphalt in the condition of the road in cold region.

Abstract: SBS modified asphalt has good abilities to resisting pressure of high or low temperature and rutting in areas where changes of temperature is large. In our country,It is one of the important engineering materials which can solve the problem of heavy traffic on asphalt pavement and rutting in long and steep roads.In order to deeply understand the changes of rheological properties during the Thermal aging reaction of SBS modified asphalt,under different temperature conditions.regarded 90 # asphalt with CNOOC as lateral reference standard, Systematic study has been applied on the rheological properties of SBS modified asphalt and 90 # asphalt at different temperatures by using methods of DSR.The results showed that:during 28°C~34°C,with the rising of Temperature,performance of Resistance to fatigue cracking of the original modified asphalt and the original 90 # asphalt has became more and more strong.At the same temperature,the original modified asphalt’s performance of Resistance to fatigue cracking is stronger than the original 90 # asphalt’s.Long and short-term aging reactions weaken the performance of resistance to fatigue cracking of SBS modified asphalt and 90 # asphalt, and the effects of long-term weakening is more obvious.during 52°C~76°C,the anti-rutting performance of SBS modified asphalts and the 90 # original asphalts became more an more bad with the rising of Temperature.

Abstract: Styrene-Butadiene-Styrene (SBS) has been widely used in the modified asphalt engineering around the world due to its excellent contribution to both high and low temperature performance of asphalt. The content of SBS plays a critical role in the performance of modified asphalt. Therefore, an accurate and effective method to quantify the SBS content in modified asphalt was proposed based on the Fourier-Transform Infrared (FTIR) spectroscopy method. Two Infrared (IR) indices were provided to quantify the content of SBS. In addition, the practicability and accuracy of this method was verified by testing the prepared sample in laboratory.

Abstract: In order to study the effect of warm mix addictive EC120 on asphalt performance, tests on asphalt density, penetration degree, softening point and ductility were carried out through adding various contents of EC120 to 70# paving asphalt (A grade) and SBS I-D polymer modified asphalt. The results indicate that when adding 3% content of EC120, the modification effect for these two kinds of asphalts is the best. The penetration degree of 70# paving asphalt decreases greatly than that for SBS polymer modified asphalt, but softening point increases small. The warm mix agent EC120 can improve the high-temperature stability and low-temperature anti cracking performance of asphalt. It has wide application prospect.

Abstract: To test the effects of crumb rubber's mesh and parameters to rubber asphalt to improve the performance of asphalt, we use different mesh rubber powder and asphalt to prepare rubber asphalt in the laboratory, and do dynamic mechanical testing to rubber asphalt sample. We find that different mesh rubber powder have obviously different action to improve the performance of asphalt. Under the same conditions, in order to make better use of modified bitumen. We propose how to use modified asphalt prepared by different mesh rubber powder for different paving.

Abstract: Buton Rock Asphalt is a natural hard asphalt which is relatively rich in asphaltene and very low in wax. Through researches and practices, it is proved that the mixture of a certain amount of rock asphalt into the petroleum asphalt for regular roads can considerably improve the adhesivity of asphalt and aggregate and the high-temperature stability, low temperature crack resistance and water susceptibility. Relying on Guangdong Shantou To Jieyang Expressway, this paper applies Buton Rock Asphalt (hereinafter referred to as BRA) to making 70 Aiptek (hereinafter referred to as the IRPC-70) be modified, tests and analyzes the asphaltene content of the BRA and mineral levels and studies the influence of the BRA content on performance of modified asphalt. In the mixture design phase, it studies the impact of aggregate gradation after the BRA accession, obtaining the correction factor of the key sieve’s pass rate. Finally, the BRA mix design and pavement performance has been studied by the test section.

Abstract: Study on nanomodified asphalt is a hot and new topic in the field of pavement’s material research. Reviewed the application of nanomaterial and technology in asphalt pavement and elaborated the nanomodified asphalt’s composition. To make a clear understanding of nanomodified asphalt’s properties, it also analyzed the nanomodified asphalt’s formation mechanism. Based on the analysis of nanomodified asphalt, we put forward several most promising research direction in this field.

Abstract: Composite modified asphalts with micron fly ash/SBS and nanocalcium carbonate (nanoCaCO₃)/ SBS were prepared respectively by melt blending. The ageing properties and physical properties of micron fly ash/SBS and CaCO₃/SBS modified bitumen were investigated. The results demonstrate that micron fly ash/SBS modified bitumen exhibited an increasing softening point, a decreasing penetration and a decreasing ductility. Compared with that of SBS modified bitumen, the anti-aging property of the micron fly ash/SBS modified bitumen becomes worse. Effects of the nanoCaCO₃ on the properties of SBS modified asphalt appear as a decreasing penetration, an increasing softening point, and a decreasing ductility. The anti-aging property of the CaCO₃/SBS modified asphalt was better than that of the SBS modified asphalt.