Experimental testing of hot mix asphalt mixture made of recycled aggregates

2011 ◽  
Vol 29 (12) ◽  
pp. 1316-1326 ◽  
Author(s):  
Muhammad Masood Rafi ◽  
Adnan Qadir ◽  
Salman Hameed Siddiqui
Keyword(s):  
Hot Mix Asphalt ◽  
Experimental Testing ◽  
Asphalt Mixture ◽  
Recycled Aggregates

scholarly journals Laboratory Investigation of Compaction Characteristics of Plant Recycled Hot-Mix Asphalt Mixture

2021 ◽  
Vol 13 (6) ◽  
pp. 3005
Author(s):  
Jiangang Yang ◽  
Chen Sun ◽  
Wenjie Tao ◽  
Jie Gao ◽  
Bocheng Huang ◽  
...  
Keyword(s):  
Regression Model ◽  
Hot Mix Asphalt ◽  
Orthogonal Experiment ◽  
Asphalt Mixture ◽  
Material Design ◽  
Void Content ◽  
Range Analysis ◽  
Aggregate Gradation ◽  
Compaction Characteristics ◽  
Compaction Energy

In this study, the compaction characteristics of recycled hot-mix asphalt (RHMA) were evaluated using the void content (VV), compaction energy index (CEI), slope of accumulated compaction energy (K), and lock point (LP). Then, the effects of the compaction parameters, including the gradation of the RHMA, reclaimed asphalt pavement (RAP) content, temperature of gyrations, and number of gyrations, on the compaction characteristics of RHMA were investigated. An orthogonal experiment was designed and the data collected were analyzed via range analysis; then, a regression model was generated relying on a quadratic polynomial. Furthermore, the regression model was used for the comparison and prediction of the mixture’s compactability during the material design. Finally, the compaction mechanism of RHMA was discussed from the perspective of the void content of RAP particles. The results showed that a finer aggregate gradation, a higher gyration temperature, a greater number of gyrations, and a higher RAP content were effective for increasing the compactability of RHMA. The range analysis results suggest that the gradation of RHMA has the greatest influence on compactability, followed by the RAP content. The RAP aggregate cannot diffuse to a new mixture completely, so the remained RAP particle reduces the void content of RHMA. Therefore, a higher RAP content up to 50% can help RHMA to achieve the designed void content with higher efficiency.

Performance-based mix design of unmodified and lime-modified hot mix asphalt

2012 ◽  
Vol 39 (7) ◽  
pp. 824-833 ◽  
Author(s):  
Sangyum Lee ◽  
Cheolmin Baek ◽  
Je-Jin Park
Keyword(s):  
Performance Test ◽  
Hot Mix Asphalt ◽  
Permanent Deformation ◽  
Asphalt Mixture ◽  
Fatigue Cracking ◽  
Mix Design ◽  
Direct Tension ◽  
Element Analysis ◽  
Asphalt Content ◽  
National Cooperative

This paper presents the performance evaluation of unmodified and lime-modified hot mix asphalt (HMA) mixtures at varying asphalt content using asphalt mixture performance test developed from National Cooperative Highway Research Program project 9-19 and 9-29 and the viscoelastic continuum damage finite element analysis. Test methods adopted in this study are the dynamic modulus test for stiffness, the triaxial repeated load permanent deformation test for rutting, and the direct tension test for fatigue cracking. The findings from this study support conventional understanding of the effects of asphalt content and lime modification on the fatigue cracking and rutting performance. Finally, the optimum asphalt content for both lime-modified and unmodified mixtures are proposed based on the knowledge gleaned from the performance-based mix design methodology. With additional validation and calibration, the comprehensive methodology described in this paper may serve as the foundation for a performance-based HMA mix design and performance-related HMA specifications.

scholarly journals Additive Percent Influence on “Warm Mix” Behavior

2014 ◽  
Vol 3 (1) ◽  
pp. 35-42
Author(s):  
Carmen Răcănel ◽  
Adrian Burlacu
Keyword(s):  
Sustainable Development ◽  
Working Conditions ◽  
Hot Mix Asphalt ◽  
New Technology ◽  
Asphalt Mixture ◽  
Master Curves ◽  
Stiffness Modulus ◽  
Chemical Additive ◽  
The Road ◽  
Field Compaction

Abstract The benefits of WMA technologies include reduced fuel usage and emissions in support of sustainable development, improved field compaction, which can facilitate longer haul distances and cool weather pavement, and better working conditions. Since this is a relatively new technology, it is necessary to determine the behavior and the performances of this type of asphalt mixture depending on additive percent. These technologies tend to reduce the viscosity of the asphalt and provide for the complete coating of aggregates at lower temperatures. WMA is produced at temperatures 20 to 30°C lower than typical hot-mix asphalt (HMA). The paper presents the results obtained in the Road Laboratory of Technical University of Civil Engineering Bucharest on an asphalt mixture with fibers (MASF16) prepared according to the “warm mix” technology with chemical additive. Different percent of additive are used in laboratory to draw up the “master curves” of asphalt mixture obtained by 4PB-PR stiffness modulus results.

Performance and Evaluation of Hot Mix Asphalt with an Addition of Lime Kiln Dust as a Mineral Filler Based on Western Australia Conditions

2018 ◽  
Vol 934 ◽  
pp. 212-216 ◽  
Author(s):  
Peerapong Jitsangiam ◽  
Hamid Nikraz ◽  
Korakod Nusit
Keyword(s):  
Hot Mix Asphalt ◽  
Resilient Modulus ◽  
Asphalt Mixture ◽  
Hydrated Lime ◽  
Superior Performance ◽  
Mineral Filler ◽  
Lime Kiln ◽  
Performance And Evaluation ◽  
Kiln Dust ◽  
Lime Kiln Dust

This study demonstrates an assessment into the different effects of lime as a mineral filler for use in densely graded hot mix asphalt (HMA). Five percent by mass of hydrated lime and lime kiln dust (LKD) were added to an asphalt mixture as its mineral filler. A series of laboratory tests to evaluate stability and flow, resilient modulus and tensile stripping ratio with reference to a control mix (a commonly used HMA) were performed. The test results showed that mixing hydrated lime into a HMA mix could enhance superior performance of hydrated lime-HMA test samples for all tests, demonstrating no moisture susceptibility. Test samples of HMA with LKD also demonstrated moisture resistance and can offer a sustainable alternative to hydrated lime, yielding one quarter of the cost. The control mix proved to be an inadequate choice upon failing the stripping potential test and therefore deemed to be susceptible to moisture.

Laboratory evaluation of electromagnetic density gauges for hot-mix asphalt mixture density measurement

2018 ◽  
Vol 158 ◽  
pp. 1055-1064 ◽  
Author(s):  
Zhen Leng ◽  
Zeyu Zhang ◽  
Yuan Zhang ◽  
Yangyang Wang ◽  
Huayang Yu ◽  
...  
Keyword(s):  
Hot Mix Asphalt ◽  
Asphalt Mixture ◽  
Density Measurement ◽  
Laboratory Evaluation ◽  
Mixture Density

Analysis of energy consumption in the production of hot mix asphalt (batch mix plant)

2016 ◽  
Vol 43 (12) ◽  
pp. 1044-1051 ◽  
Author(s):  
Ivica Androjić ◽  
Zlata Dolaček Alduk
Keyword(s):  
Energy Consumption ◽  
Influencing Factors ◽  
Hot Mix Asphalt ◽  
Asphalt Mixture ◽  
Production Capacity ◽  
Daily Production ◽  
Mineral Mixture ◽  
The Republic ◽  
Production Period ◽  
Mixture Samples

This paper describes tests in which influencing factors that affect energy consumption in the rotary drum were monitored. The monitored influencing factors are moisture, delays in daily production, hourly production capacity, and temperature of produced hot mix asphalt (HMA). The tests include the production of 88 079 t of HMA of continuous and discontinuous gradation on a cyclic asphalt plant in the Republic of Croatia. In 2014, 182 production terms were monitored (155 observed), whereas the moisture content was tested using the same number of input mineral mixture samples. The temperature of the produced asphalt mixture was measured using approximately 67 753 samples during the entire production period. Delays in work and hourly production capacity were measured during production by recording the duration of working time and delays. The final result of this study is the creation of a regression model of the correlation between energy consumption and temperature of the asphalt mixture and the hourly capacity and moisture in the mineral aggregate.

Highly Modified Asphalt Binder for Asphalt Crack Relief Mix

2017 ◽  
Vol 2630 (1) ◽  
pp. 110-117 ◽  
Author(s):  
Matheus S. Gaspar ◽  
Kamilla L. Vasconcelos ◽  
Amanda H. M. da Silva ◽  
Liedi L. B. Bernucci
Keyword(s):  
Hot Mix Asphalt ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Bending Test ◽  
Asphalt Binders ◽  
Reflective Cracking ◽  
Modified Asphalt ◽  
Asphalt Overlay ◽  
Modified Asphalt Binder ◽  
Styrene Butadiene

Reflective cracking is a common issue with respect to rehabilitated asphalt pavements, especially when the rehabilitation is done by applying a hot-mix asphalt overlay on the existing damaged pavement. Several approaches can be adopted to delay reflective cracking. They include an increase of the overlay thickness and the use of a stress relief asphalt mixture (SRAM), which is a fine-graded, flexible, and thin asphalt interlayer. Because the efficiency of a SRAM is highly related to the properties of the asphalt binder used in the mixture, it is of interest to use a highly modified asphalt (HiMA) binder. This paper describes a field test comprising three sections at BR-116 (a heavily trafficked highway in Brazil). One of the rehabilitation strategies used for a cracked asphalt pavement was a 2.5-cm SRAM (produced with a HiMA binder) and 5-cm styrene–butadiene–styrene (SBS) hot-mix asphalt (HMA). The other two strategies were to apply SBS HMA overlays of different thicknesses (7.5 cm and 10.5 cm). The aim was to evaluate and compare the capability of these solutions to control reflective cracking. Rheological properties and multiple stress creep and recovery tests were performed on the asphalt binders, and the semicircular bending test was performed on the asphalt mixtures. The surface conditions were monitored, and the results for each section were compared. After a 29-month period, the section that received the interlayer had the lowest cracked area and showed better resistance than the overlays did to reflective cracking and better maintenance of the original thickness of the pavement.

Technical Research on Application of Warm Mix Flame-Retardant Noise Reduction Asphalt Mixture

2015 ◽  
Vol 723 ◽  
pp. 435-439
Author(s):  
Xi Rong Wu ◽  
Su Xian Li
Keyword(s):  
Noise Reduction ◽  
Flame Retardant ◽  
Hot Mix Asphalt ◽  
Asphalt Mixture ◽  
Jiangxi Province ◽  
Engineering Practice ◽  
Result Show ◽  
New Type ◽  
Research On Application ◽  
Special Environment

Due to the special environment of the tunnel, the paper developed a kind of antiflaming, warm-mix and noise reduction asphalt mixture combined with engineering practice chishui tunnel project in jiangxi province. Asphalt mixture has good performance in low mixing temperature, flame retardant, noise reduction and better performance by using AMP flame-retardant and Evotherm DAT warmed-mix technology. A series of test are carried out to analyze the characteristics of high temperature rutting, low temperature crack resistance and water stability of warmed mix flame retardant noise reduction asphalt mixture and Ordinary hot mix asphalt mixture. The result show that, compared with the pavement performance of ordinary hot mix asphalt mixture AC-13, the new type of asphalt mixture OGFC-13 has good cooling, flame retardant and noise reduction performance.

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