Characterization of Asphalt Mixtures Produced with Coarse and Fine Recycled Asphalt Particles (original) (raw)
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Performance Evaluation of Asphalt Mixtures with High Recycled Asphalt Pavement Content
Transportation Research Record: Journal of the Transportation Research Board, 2011
This study extensively evaluated the resistance to moisture damage and thermal cracking of hot-mix asphalt (HMA) mixtures with high recycled asphalt pavement (RAP) content (up to 50%) from field sections on provincial Highway 8 between Gimli and Hnausa in Manitoba, Canada. A comparison between the properties and performance of the field-produced and laboratory-produced mixtures was also conducted and was included in this study. HMA mixtures with 50% RAP resulted in acceptable resistance to moisture damage and thermal cracking. The use of multiple freeze–thaw cycles provided a better characterization of the mixtures' resistance to moisture damage. Acceptable correlations were observed between the estimated critical temperatures from the blending chart and the measured ones from the recovered asphalt binders. Overall, laboratory-produced mixtures could be used to evaluate the relative resistance of the field-produced mixtures to moisture damage and thermal cracking.
Performance of Warm Mix Recycled Asphalt containing up to 100% RAP
The asphalt industry has been under pressure to reduce its emissions. This can be achieved, from one hand, by decreasing the mixing and laying temperatures of asphalt mixtures. On the other hand, recycling of Reclaimed Asphalt Pavement (RAP) is a viable solution that allows reducing waste production and resources consumption. This paper presents a study that combines Warm Mix Asphalt with the use of RAP aggregates. These mixtures, while being produced at lower temperature than traditional Hot Mixtures contain 100% RAP. Several Warm Mix Recycled Asphalt (WMRA) were prepared with 100% RAP and different emulsion contents and their behaviour was assessed by means of laboratory tests such as water sensitivity, stiffness, fatigue resistance and rutting resistance. The obtained results show that these WMRA may be successfully used in road pavements in substitution of conventional Hot Mix Asphalts.
Laboratory Evaluation of Warm Mix Asphalt and Asphalt Mixtures with Recycled Materials
2011
Transportation infrastructure poses significant challenges to sustainable development because its construction and maintenance require large amounts of material consumption, energy input, and capital investment. A refined systematic approach to the design, construction, and management of pavement systems is necessary to meet the objectives of sustainable development. The major components of sustainable development in pavement systems include economic and social considerations in addition to environmental preservation. Asphalt mixture design and construction practices are essential to the environmental component of sustainable development. These practices include, but are not limited to, asphaltic mixture reusing and recycling as well as innovative technologies considering energy efficiency and stormwater management. Performance and durability become a critical issue with the changes introduced to the mixtures. This paper briefly summarizes the evaluation of mixture design practices and the performance of asphalt mixtures prepared with various types of recycled materials and warm mix technologies.
The Effects of Reclaimed Asphalt Pavement (RAP) on the Laboratory Performances of Hot Mix Asphalts
2009
The use of reclaimed asphalt pavement (RAP) in flexible pavement surface layer has been a major sensitive issue in the construction industry. Due to limited space available in landfills, the amount of high quality virgin aggregate declines, and the high price of oil, the use of RAP in new asphalt concrete mixtures has become very attractive. This research has been conducted to study the laboratory performances of HMA mixture containing RAP, in which thermal, fatigue, rutting, moisture sensitivity, and resilient modulus characteristic were evaluated. A Marshall mix design 19 mm mixture containing 0% RAP with binder grade of PG64-22 and PG64-28NV were used as the control mixtures for evaluating properties of mixtures containing 15% and 30% RAP for three different sources of RAP which include one fresh plant waste RAP material. The effects of RAP on the laboratory performances of RAP added HMA mixture depends on type of RAP, amount of RAP, target binder grade to be produced, mixture pe...
Construction and Building Materials, 2011
This paper presents an experimental study to characterize the mechanical behaviour of bituminous mixtures containing high rates of reclaimed asphalt pavement (RAP). Two semidense mixtures of 12 and 20 mm maximum aggregate size and containing 40 and 60% RAP, respectively (S-12 and S-20, in accordance with Spanish specifications), which were used for rehabilitation of a highway section, were evaluated. First, the effect of RAP variability on the recycled mixtures was analyzed. Their mechanical properties were then studied by determining the stiffness modulus and indirect tensile strength and cracking and fatigue behaviour. Results show that high rates of recycled material can generally be incorporated into bituminous mixes by proper characterization and handling of RAP stockpiles.
Laboratory Evaluation of Warm Mix Asphalt and Asphalt Mixtures with Recycled Materials a
Transportation infrastructure poses significant challenges to sustainable development because its construction and maintenance require large amounts of material consumption, energy input, and capital investment. A refined systematic approach to the design, construction, and management of pavement systems is necessary to meet the objectives of sustainable development. The major components of sustainable development in pavement systems include economic and social considerations in addition to environmental preservation. Asphalt mixture design and construction practices are essential to the environmental component of sustainable development. These practices include, but are not limited to, asphaltic mixture reusing and recycling as well as innovative technologies considering energy efficiency and stormwater management. Performance and durability become a critical issue with the changes introduced to the mixtures. This paper briefly summarizes the evaluation of mixture design practices and the performance of asphalt mixtures prepared with various types of recycled materials and warm mix technologies.
Performance Evaluation of Warm Mix Asphalt Mixtures with Recycled Asphalt Pavement
Periodica Polytechnica Civil Engineering, 2016
Warm mix asphalt (WMA) technology provides not only the production of asphalt pavement at a lower temperature than the temperature maintained in Hot Mix Asphalt (HMA) but also encourages the utilization of Recycled Asphalt Pavement (RAP) and therefore saves energy and nonrenewable resources as well as reduces emissions and fuel consumption. This paper describes the feasibility of utilizing four different WMA additives (organic, chemical, synthetic zeolite and natural zeolite) with different rates of RAP. Following the determination of optimum RAP content corresponding to each WMA additive, Marshall analysis, indirect tensile stiffness modulus and fatigue behavior of HMA and WMA involving RAP were analyzed and compared with control specimens. Hamburg wheel tracking device was also utilized to evaluate the permanent deformation characteristics of mixtures containing optimum RAP content.
Construction and Building Materials, 2012
This study investigates the influence of fractionated reclaimed asphalt pavement (RAP) materials on asphalt mixture performance. The RAP mixture percentages used were 15%, 35%, and 50% in the study. The amount of RAP materials recycled within hot mix asphalt (HMA) drum plants are typically no more than 30% RAP. Asphalt pavement analyzer (APA) rutting, modified Lottman, and dynamic modulus testing were conducted on the RAP and virgin aggregate blended asphalt mixtures. On average between all RAP mixtures, the addition of RAP decreased rutting by 24%, and increased resilient modulus by 52% due to the addition of RAP asphalt binder and aggregates; which stiffen the mixture under higher temperature and heavier loading conditions. Dynamic modulus results indicated a statistical significant difference for high percentage RAP mixtures.
Performance Evaluation of Hot Mix Asphalt with Different Proportions of RAP Content
2018
Reclaimed Asphalt Pavement (RAP) is old asphalt pavement that has been removed from a road by milling or full depth removal. The use of RAP in hot mix asphalt (HMA) eliminates the need to dispose old asphalt pavements and conserves asphalt binders and aggregates, resulting in significant cost savings and benefits to society. This paper presents a study on HMA with different RAP proportions carried out to evaluate the volumetric properties and performance of asphalt mixes containing different proportions of RAP. Marshall Mix Design Method was used to produce control mix (0% RAP) and asphalt mixes containing 15% RAP, 25% RAP and 35% RAP in accordance with Specifications for Road Works of Public Works Department, Malaysia for AC14 dense graded asphalt gradation. Volumetric analysis was performed to ensure that the result is compliance with specification requirements. The resilient modulus test was performed to measure the stiffness of the mixes while the Modified Lottman test was condu...
Buildings
Newer technologies such as warm mix asphalt (WMA) and reclaimed asphalt pavement (RAP) have gained international approval and have been considered as appropriate solutions that support the sustainability goals of the highway sector. However, both technologies present some shortcomings. The lower mixing and compaction temperatures of WMA reduce the binder aging and the bond between the aggregates and the coating binder, thus resulting in less rutting resistance and higher moisture susceptibility. On the other hand, RAP mixes tend to be stiffer and more brittle than conventional hot mix asphalt (HMA) due to the effect of aged binder. This tends to increase the crack propagation distresses. In an attempt to overcome their individual shortcomings, this study investigated the new concept of a combined WMA-RAP technology. The chemical WMA additive Rediset LQ1102CE was utilized with mixtures incorporating low (15%), medium (25%), and high (45%) RAP contents. Dynamic modulus (DM) and flow n...