scholarly journals Asphalt Mixture for the First Asphalt Concrete Directly Fastened Track in Korea

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Seong-Hyeok Lee ◽  
Dae-Wook Park ◽  
Hai Viet Vo ◽  
Samer Dessouky
Keyword(s):  
Asphalt Concrete ◽  
Design Method ◽  
Asphalt Mixture ◽  
Digital Camera ◽  
Aggregate Size ◽  
Fatigue Tests ◽  
Asphalt Mixtures ◽  
Maximum Aggregate Size ◽  
Aggregate Gradation ◽  
Modified Asphalt

The research has been initiated to develop the asphalt mixtures which are suitable for the surface of asphalt concrete directly fastened track (ADFT) system and evaluate the performance of the asphalt mixture. Three aggregate gradations which are upper (finer), medium, and below (coarser). The nominal maximum aggregate size of asphalt mixture was 10 mm. Asphalt mixture design was conducted at 3 percent air voids using Marshall mix design method. To make impermeable asphalt mixture surface, the laboratory permeability test was conducted for asphalt mixtures of three different aggregate gradations using asphalt mixture permeability tester. Moisture susceptibility test was conducted based on AASHTO T 283. The stripping percentage of asphalt mixtures was measured using a digital camera and analyzed based on image analysis techniques. Based on the limited research results, the finer aggregate gradation is the most suitable for asphalt mixture for ADFT system with the high TSR value and the low stripping percentage and permeable coefficient. Flow number and beam fatigue tests for finer aggregate asphalt mixture were conducted to characterize the performance of asphalt mixtures containing two modified asphalt binders: STE-10 which is styrene-butadiene-styrene (SBS) polymer and ARMA which is Crum rubber modified asphalt. The performance tests indicate that the STE-10 shows the higher rutting life and fatigue life.

scholarly journals Enhanced Dry Process Method for Modified Asphalt Containing Plastic Waste

2021 ◽  
Vol 8 ◽  
Author(s):  
Hasanain Radhi Radeef ◽  
Norhidayah Abdul Hassan ◽  
Ahmad Razin Zainal Abidin ◽  
Mohd Zul Hanif Mahmud ◽  
Nur Izzi Md. Yusoffa ◽  
...  
Keyword(s):  
Resilient Modulus ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Aggregate Size ◽  
Plastic Waste ◽  
Asphalt Mixtures ◽  
Maximum Aggregate Size ◽  
Dry Process ◽  
Modified Asphalt ◽  
And Performance

In recent years, the proliferation of plastic waste has become a global problem. A potential solution to this problem is the dry process, which incorporates plastic waste into asphalt mixtures. However, the dry process often has inconsistent performance due to poor interaction with binder and improper distribution of plastic waste particles in the mixture skeleton. This inconsistency may be caused by inaccurate mixing method, shredding size, mixing temperature and ingredient priorities. Thus, this study aims to improve the consistency of the dry process by comparing the control asphalt mixture and two plastic waste-modified asphalt mixtures prepared using the dry process. This study used crushed granite aggregate with the nominal maximum aggregate size of 14 mm whereas the shredded plastic bag is in the range of 5–10 mm. Quantitative sieving analysis and performance tests were carried out to examine the effects of plastic waste added into the asphalt mixture. The volumetric and performance properties combined with image analysis of the modified mixtures were obtained and compared with the control mixture. In addition, the moisture damage, resilient modulus, creep deformation and rutting were evaluated. This study also highlighted in detail the distribution of plastic particles in the final skeleton of the asphalt mixture. Based on the analysis, an enhanced dry process of mixing procedure was proposed and evaluated. Results showed that the addition of plastic particles using the conventional dry process leads to the deviation in the aggregate structure as high plastic content is added. Furthermore, the enhanced dry process developed in this study presents substantial enhancement in the asphalt performance, particularly with plastic waste that accounts for 20% of the weight of the asphalt binder.

scholarly journals Laboratory Evaluation of Hot Asphalt Concrete Properties with Cuban Recycled Concrete Aggregates

2018 ◽  
Vol 10 (8) ◽  
pp. 2590 ◽  
Author(s):  
Debora Acosta Alvarez ◽  
Anadelys Alonso Aenlle ◽  
Antonio Tenza-Abril
Keyword(s):  
Asphalt Concrete ◽  
Aggregate Size ◽  
Asphalt Mixtures ◽  
Recycled Concrete ◽  
Construction And Demolition Waste ◽  
Recycled Aggregates ◽  
Laboratory Evaluation ◽  
Maximum Aggregate Size ◽  
Demolition Waste ◽  
Aggregate Fraction

Recycled Aggregates (RA) from construction and demolition waste (CDW) are a technically viable alternative to manufacture of asphalt concrete (AC). The main objective of this work is to evaluate the properties of hot asphalt mixtures that have been manufactured with different sources of CDW (material from concrete test specimens, material from the demolition of sidewalks and waste from prefabrication plants) from Cuba. Dense asphalt mixtures were manufactured with a maximum aggregate size of 19 mm, partially replacing (40%) the natural aggregate fraction measured between 5 mm and 10 mm with three types of RA from Cuba. Marshall specimens were manufactured to determine the main properties of the AC in terms of density, voids, stability and deformation. Additionally, the stiffness modulus of the AC was evaluated at 7 °C, 25 °C and 50 °C. The results corroborate the potential for using these sources of CDW from Cuba as a RA in asphalt concrete, thereby contributing an important environmental and economic benefit.

Laboratory Assessment of Dense Graded Asphalt Concrete Incorporating Coal Furnace Ash in South of Vietnam

2021 ◽  
Vol 879 ◽  
pp. 117-125
Author(s):  
Dang Tung Dang ◽  
Manh Tuan Nguyen ◽  
Ngoc Tram Hoang ◽  
Anh Thang Le
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Mixture ◽  
Coal Ash ◽  
Aggregate Size ◽  
Road Construction ◽  
Maximum Aggregate Size ◽  
Fine Aggregate ◽  
Laboratory Assessment ◽  
Laboratory Performance ◽  
Major Interest

Currently, application of industrial waste or by-product in road construction industrials is a major interest by researchers, government officers and engineers. Coal ashes by-product from industrial parks negatively impact environment, costly in treatment, and require large ground for disposing areas. Therefore, this paper proposes on using the coal ash from furnace products of an industrial park in South of Vietnam to be incorporated into dense graded asphalt concrete using Nominal Maximum Aggregate Size 12.5mm. Laboratory performance tests including Marshall stability, indirect tensile strength, Cantabro loss, and dynamic fatigue test were conducted. The effects of coal ash contents in replacement of fine aggregate which is passing 4.75mm sieve from asphalt mixture into laboratory performance of mixture is also discussed in detail.

Mix Design Method of the SMC Cold Temperature Modified Asphalt Mixture

2017 ◽  
Vol 744 ◽  
pp. 185-189
Author(s):  
Miao Miao Tian ◽  
Chao Yang Guo ◽  
Jin Yan ◽  
Ya Fei Li
Keyword(s):  
Design Method ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Cold Temperature ◽  
Subzero Temperature ◽  
Modified Asphalt ◽  
Harmful Emission ◽  
Long Time ◽  
Special Environment ◽  
Technology Level

The SMC cold temperature asphalt mixture consumed less energy and harmful emission compares with the traditional HMA and WMA, and it can be worked at the subzero temperature or after a long time storage, which makes the construction and maintenance of the asphalt pavement in a special environment (low temperature) and special conditions (without a hot mix station) come true. It has been widely used in Beijing, Xinjiang, Sichuan, Tibet, etc. with a satisfied performance. Highway construction and maintenance technology level of China would be positively promoted by using the SMC asphalt mixtures.

Laboratory Investigate of the Effect of Fine Aggregates on Asphalt Mixture Materials

2011 ◽  
Vol 225-226 ◽  
pp. 577-580
Author(s):  
Yong Ye ◽  
Yi Zhou Cai
Keyword(s):  
Compressive Strength ◽  
Asphalt Mixture ◽  
Aggregate Size ◽  
Asphalt Mixtures ◽  
Fine Aggregate ◽  
Test Results ◽  
Creep Tests ◽  
Aggregate Gradation ◽  
Static Creep ◽  
Fine Aggregates

The objective of this study is to investigate and evaluate the effect of fine aggregates (aggregate size smaller than or equal to 2.36 mm) on the compressive strength and creep behavior of asphalt mixtures. The variables that are considered in the study include the sizes and gradations of fine aggregate. A kind of standant aggregate gradation and four kinds of reduced aggregate gradation mixture specimens are used. Uniaxial compression and static creep tests were realized at different loading conditions. The test results showed that the different fine aggregate sizes do not result in significant differences in compressive strength and creep values using the same percentage of fine aggregates (38.4%). Only the different gradations showed a little differences for mixtures made with different gradations but same aggregate size (between 2.36 and 1.18 mm).

Effect of Single Face Compaction on Stability and Flow of Asphalt Specimen

2014 ◽  
Vol 69 (3) ◽  
Author(s):  
Fung-Lung Chang ◽  
Haryati Yaacob ◽  
Mohd. Rosli Hainin
Keyword(s):  
Design Method ◽  
Aggregate Size ◽  
Maximum Aggregate Size ◽  
Specimen Preparation ◽  
Aggregate Gradation ◽  
Single Face ◽  
Stone Mastic Asphalt ◽  
Local Specifications ◽  
The Stability

Recent research on the performance of bond strength between pavement layers results in the preparation of double layered specimen becomes inevitable. Double layered specimen may be in field scale or laboratory scale. Marshall mixture design method is normally adopted to prepare double layered specimen in laboratory, incorporating the compaction of binder course at both faces and followed by a single face compaction of wearing course. Due to that, compaction at single face only will raised potential scepticism over the quality of the compacted mixture. This paper focused on the performance of stability and flow for single face compacted wearing course specimen prepared using Marshall procedure at a thickness of 50mm for Asphaltic Concrete mixture of nominal maximum aggregate size 10 mm (AC10) and Stone Mastic Asphalt of nominal maximum aggregate size 14 mm (SMA14). The stability and flow was investigated with the increasing compacting effort. The stability and flow at optimum compacting effort was also checked. From the research, it was noticed that stability increased with compacting effort while flow shows a decreasing trend. A stability and flow value of 12.8 kN and 2.27 mm as well as 10.4 kN and 2.61 mm was recorded for AC10 and SMA14 respectively at optimum compacting effort. Such observation may be accounted to the aggregate gradation in the mixture besides the binder properties of two different binders used. Despite the adoption of single face compaction in specimen preparation, at optimum compacting effort, the stability and flow values was also found to be within the range as specified by local specifications.

Laboratory Evaluation of Mixture Type on Highly Modified Asphalt Mixtures in Virginia

2018 ◽  
Vol 2672 (28) ◽  
pp. 59-68
Author(s):  
Benjamin F. Bowers
Keyword(s):  
Asphalt Binder ◽  
Aggregate Size ◽  
Asphalt Mixtures ◽  
Laboratory Evaluation ◽  
Maximum Aggregate Size ◽  
Air Voids ◽  
Modified Asphalt ◽  
Modified Asphalt Binder ◽  
Dynamic Modulus Test ◽  
Scb Specimen

The work presented attempts to address reflective cracking of asphalt-surfaced pavements through binder modification with a highly polymer (HP)-modified asphalt binder. Nine asphalt mixtures ranging from fine dense-graded mixtures to stone matrix asphalt (SMA) mixtures were investigated with conventional polymer modified binders and HP binder. The dynamic modulus test, overlay test (OT), and semi-circular bend (SCB) test were used to evaluate the mixtures. In the cracking tests, HP mixtures outperformed the conventionally modified control mixtures for the same mixture type. For HP mixtures, in general, SMA mixtures performed better in the cracking test than dense-graded mixtures. One of the dense-graded mixtures having larger nominal maximum aggregate size (NMAS) performed better than the mixture with a smaller NMAS, whereas the other having a larger NMAS was not significantly different in crack testing. Further, a discussion on the calculation of bulk specific gravity and percent air voids in a cut OT and SCB specimen using saturated surface dry or vacuum sealing methods is presented.

Design of Rubberized Asphalt Concrete by Means of Coarse Aggregate Void Filling Method

2012 ◽  
Vol 463-464 ◽  
pp. 215-220
Author(s):  
Kuang Huai Wu ◽  
Guo Liang Yang ◽  
Ai Yu Zeng
Keyword(s):  
Asphalt Concrete ◽  
Coarse Aggregate ◽  
Asphalt Mixture ◽  
Aggregate Size ◽  
Temperature Stability ◽  
Maximum Aggregate Size ◽  
High Temperature Stability ◽  
Asphalt Rubber ◽  
Filling Method ◽  
Rubberized Asphalt Concrete

In order to find a convenient approach to design the mix of rubberized asphalt concrete (RAC) and make full use of the properties of RAC, a kind of RAC-13 (13 is the nominal maximum aggregate size of the mixture) was designed by means of coarse aggregate void filling method (CAVF). A series of conventional tests of asphalt mixture with five asphalt-rubber aggregate ratio(ARAR) were carried out to check the target mix design and evaluate the performance of RAC. Performance evaluation tests such as Marshall and submerged Marshall stability test, moisture damage test and wheel tracking test were included. Test results show that the high temperature stability, moisture susceptibility and road performance of RAC-13 designed with CAVF method are all favorable. The recommended optimum asphalt-rubber aggregate ratio(OARAR) is 7.1% under the condition of skeleton structure. CAVF is a good means for designing RAC to ensure its stone-on-stone contact structure.

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