جستجوی مقالات مرتبط با کلیدواژه « waste engine oil » در نشریات گروه « عمران »

Using recycled asphalt mixtures, which are made by waste materials, have attracted attentions due to their environmental and economical benefits. However, challenges exist with the performance of the recycled mixtures. In this study, the effect of using nano-silica on the behavior of non-rejuvenated and rejuvenated recycled asphalt concrete has been investigated. Penetration grade asphalt binder modified by 5% of nano-silica has been used in recycled asphalt concrete containing 60% of reclaimed asphalt pavement (RAP). The mixture without rejuvenation and rejuvenated by a constant percentage of waste cooking oil and waste engine oil has been evaluated by indirect tensile strength test on dry and moisture conditioned samples, dynamic creep test and stress controlled fatigue test. The properties of the mixtures have been compared with each other and with the control mixture made by neat binder and aggregates. The tests have been conducted on the samples before aging and after undergoing long term aging condition to investigate the effect of aging on the properties. Results reveal that incorporating RAP into the mixture increases the tensile strength, resistance against creep and fatigue and decreases the moisture resistance of the mixture. Nano-silica modification increases the dry and conditioned tensile strength, resistance against permanent deformation and fatigue. Nano-silica also improves aging resistance of the recycled mixtures. Furthermore, results reveal that waste oils as rejuvenator improves moisture resistance of the mixtures with more improvement for waste cooking oil. In addition, the effect of aging on the properties of the mixture rejuvenated by waste cooking oil is higher than those rejuvenated by waste engine oil.

In this study the effects of short and long term ageing on some of engineering properties of recycled asphalt concrete containing high percentage of reclaimed asphalt pavement (RAP) and rejuvenated by different dosages of waste engine oil (WEO) have been investigated. The coarse fraction of asphalt concrete has been replaced with RAP and the mixture has been rejuvenated by different dosages, namely 0, 4, 7 and 10% (by the weight of total binder) of WEO, and the volumetric and Marshall properties, indirect tensile strength (ITS) and creep properties of the mixtures after experiencing different ageing conditions including un-aged, short term and long term ageing have been evaluated. Results reveal that inclusion of RAP into mixture increases the optimum binder content, Marshall stability and quotient, ITS and creep resistance; the Marshall stability and quotient, optimum binder content, ITS and creep resistance decreases with increasing WEO content. In un-aged condition, Marshall stability and quotient increase up to 7% of WEO content, beyond which the trend reverses. Also, ageing results in increase of Marshall stability, ITS and creep resistance, and decrease of flow with more effect after long term ageing. The degree of ageing effect on the properties depends on the type of ageing, type of mixture and amount of rejuvenator. The effect of ageing on Marshall quotient increases up to 7% of WEO content, beyond which decreases. For ITS the effect of ageing decreases with increase of WEO content, and for creep resistance, the effect of ageing increases with increase of WEO content. The Marshall stability and ITS are more affected by ageing in recycled mixtures than in control mixture and the level effect decreases with increase of WEO. Furthermore, results reveal that creep resistance is more affected from ageing than the ITS and Marshall properties. .

One of the main factors that cause distresses and cracks in asphalt pavement is ageing and it makes pavements deteriote over time. Previous studies about this phenomenon have shown that the use of "bioasphalt" has a positive effect on the ageing and it can act as an antioxidant and rejuvenating material. In this study, the possibility of using lignin and waste engine oil in bitumen to improve the chemical and ageing properties of bitumen was investigated. The lignin used in the study was extracted from black liquor. Waste engine oil was taken from a car repair shop. The samples are PG64-22 as control sample, samples containing 5 and 10% lignin, samples containing 4% waste engine oil, and samples containing both additives. FTIR analysis, ICP analysis, CHNS analysis and SEM analysis were performed on the samples to better investigate the effect of additives on aging. Also, three important aging indices were calculated using RV, DSR and FTIR tests. The results showed that the addition of lignin or WEO or a combination of both, can improve the chemical properties of bitumen. Also using waste materials in bitumen can be useful from an environmental and economic point of view. They are also effective for aging resistance and can be used as a rejuvenator.

This study investigates the effect of using waste engine oil (WEO) on some engineering properties of hot mix asphalt concrete containing different percentages of reclaimed asphalt pavement (RAP). Different percentages of WEO, namely 0, 5, 10 and 15% (by the weight of asphalt binder) have been added to the mixtures containing 25, 50 and 75% (by the weight of aggregates) of RAP and the volumetric properties, Marshall stability, flow, Marshall quotient and dynamic creep properties of the mixtures have been investigated and comparedwith control mixture without any waste material. Results show that the addition of RAP into the mixtures increases the air voids content, while, the air voids content decreases with increasing WEO content. Also, the optimum binder content of the mixtures was found to increase with increasing RAP content and decrease with increasing WEO content. In addition, the Marshall quotient of the mixtures decreases with increasing RAP content. The Marshall quotient of the mixtures containing 50 and 75% of RAP increases with increasing WEO. Dynamic creep test results show that the resistance against permanent deformation of the mixtures increases with increasing RAP content. In addition, the resistance against permanent deformation decreases with increasing WEO content. With the same RAP content, the highest resistance against permanent deformation is achieved by adding 10% of WEO. Results of this research show that, using waste engine oil as a rejuvenator of aged asphalt, enables to use up to 75% of waste asphalt in production of new asphaltic concrete.