scholarly journals Performance of Noise Reduction and Skid Resistance of Durable Granular Ultra-Thin Layer Asphalt Pavement

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4260
Author(s):  
Wei Li ◽  
Sen Han ◽  
Qibo Huang
Keyword(s):  
Thin Layer ◽  
Asphalt Binder ◽  
Resistance Index ◽  
Test System ◽  
Maximum Aggregate Size ◽  
Skid Resistance ◽  
Fine Aggregate ◽  
Asphalt Rubber ◽  
Pavement Thickness

In this paper, the ultra-thin layer (UTL) is defined as the dense framework structure mixture made of asphalt binder, fine aggregate with nominal maximum aggregate size (NMAS) not greater than 13.2 mm and possible additives (mineral or organic), thickness of 2–4 cm. The study aims to investigate comprehensive performance of UTL asphalt mixture. The method of impact freeze thaw split test and the index of impact freeze–thawing damage degree (IFTDD) are proposed to reflect the durability. The indoor tire-rolling-down test system and accelerated abrasion machine are used to simulate the tire-pavement interaction and test road noise and skid resistance, respectively. Though evaluating the influencing factors (pavement thickness, gradation, asphalt binder type, and the content of KS additive) on durability, the optimum parameters with excellent durability are recommended. Combined with the test of noise and skid resistance, the factors affecting the surface function are analyzed. Moreover, the prediction mathematical model of skid resistance and the long-term safety benefit value Eeff are put forward. Results indicate that pavement thickness is the most significant factor effecting on durability, and gradation is the most significant factor affecting noise. Compared with KS additive, gradation has a greater influence on skid resistance index of Texture Depth (TD), whereas, KS additive is the most significant factor affecting British Pendulum Number (BPN). Furthermore, with the addition of asphalt rubber (AR), IFTDD and noise are reduced by 29.17% and 1.6 dB, and BPN and TD increase by 0.7 and 0.03 mm, remarkably. Compared with different asphalt types, the noise of UTL asphalt rubber mixture with 13.2 mm NMAS (UTL13 AR) is the lowest. Additionally, when KS content increases by 0.6%, the noise increases by 3 dB. Furthermore, on the basis of the calculation results of Eeff, UTL13 AR mixture with 0.5% KS has the best long-term benefit of pavement safety and is recommended for field project.

scholarly journals Modelling and Laboratory Studies on the Adhesion Fatigue Performance for Thin-Film Asphalt and Aggregate System

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Dongsheng Wang ◽  
Junyan Yi ◽  
Decheng Feng
Keyword(s):  
Thin Film ◽  
Fatigue Behavior ◽  
Asphalt Binder ◽  
Low Frequency ◽  
Test System ◽  
Silica Content ◽  
Fatigue Performance ◽  
Adhesion Performance ◽  
Aggregate System

Adhesion between asphalt and aggregate plays an important role in the performance of asphalt mixtures. A low-frequency adhesion fatigue test was proposed in this paper to study the effect of environment on the asphalt-aggregate adhesion system. The stress-based fatigue model had been utilized to describe the fatigue behavior of thin-film asphalt and aggregate system. The factors influencing the adhesion fatigue performance were also investigated. Experiment results show that asphalt has more important effect on the adhesion performance comparing with aggregate. Basalt, which is regarded as hydrophobic aggregates with low silica content, has better adhesion performance to asphalt binder when compared with granite. The effects of aging on the adhesion fatigue performance are different for PG64-22 and rubber asphalt. Long-term aging is found to reduce the adhesion fatigue lives for rubber asphalt and aggregate system, while the effect of long-term aging for aggregate and PG64-22 binder system is positive. Generally the increased stress amplitude and test temperature could induce greater damage and lead to less fatigue lives for adhesion test system.

EVALUATION ON THE PERFORMANCE OF AGED ASPHALT BINDER AND MIXTURE UNDER VARIOUS AGING METHODS

2015 ◽  
Vol 77 (23) ◽  
Author(s):  
Mohd Khairul Idham ◽  
Mohd Rosli Hainin ◽  
M. Naqiuddin M. Warid ◽  
Noor Azah Abdul Raman ◽  
Rosmawati Mamat
Keyword(s):  
Permanent Deformation ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Aggregate Size ◽  
Maximum Aggregate Size ◽  
Asphaltic Concrete ◽  
Air Exposure ◽  
Stiffness Modulus ◽  
Aged Asphalt

Hot mix asphalt (HMA) pavement encounter short and long term aging throughout the service life. Laboratory aging is the method used to simulate field aging process of HMA pavement. This study was undertaken to determine the long term effect of different binder and mixture laboratory aging methods on HMA (binder aging and mixture aging). Three types of HMA mixtures were prepared for this study namely Asphaltic Concrete with 10 mm nominal maximum aggregate size (AC 10), Asphaltic Concrete 14 mm (AC 14) and Asphaltic Concrete 28 mm (AC 28). These specimens were conditioned with nine different methods and durations.  Resilient modulus test was carried out at 40˚C as an initial indicator of the specimen performance. Permanent deformation of the same specimens was then evaluated by dynamic creep test. Generally, the aged asphalt binder specimens have higher resilient and stiffness modulus compared to aged asphalt mixture specimens. In addition, aged binder specimens have a lower permanent strain which indicates higher resistance to permanent deformation. This study also found that high resilient and stiffness modulus of specimens is attributed by different in heating frequency, temperature, air exposure and binder content of the mixtures.

scholarly journals Long-Term Skid Resistance Evaluation of GAC-16 Based on Accelerated Pavement Testing

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Xinquan Xu ◽  
Yunhong Yu ◽  
Jun Yang ◽  
Chuanhai Wu
Keyword(s):  
Prediction Models ◽  
Asphalt Pavement ◽  
Reduction Rate ◽  
Skid Resistance ◽  
Fine Aggregate ◽  
Accelerated Pavement Testing ◽  
Evaluation Indexes ◽  
Attenuation Law ◽  
Pavement Testing

In this paper, four antiskidding surface test sections were paved to investigate the long-term skid resistance of the improved dense-graded asphalt concrete in Guangdong Province (GAC) using diabase fine aggregate instead of limestone. Four test sections were tested by the accelerated loading equipment (MLS11, mobile load simulator). The reduction law of the long-term skid resistance of GAC-16 was analyzed based on the accelerated pavement testing results. Prediction models of the GAC-16 skid resistance were also established and verified. The evaluation indexes of the long-term skid resistance of the asphalt pavement were introduced, and the antiskidding durability of different sections was evaluated. Results show that the initial British pendulum number (BPN) and mean texture depth (MTD) of the asphalt pavement cannot completely characterize its long-term skid resistance. With increasing loading cycles, the attenuation law of the BPN and MTD of GAC-16 denotes a fast reduction during the early stage, which gradually stabilizes. The relation between the skid resistance index and accelerated loading cycles was analyzed by nonlinear fitting according to the least-squares-method principle. The attenuation law of the BPN and MTD of GAC-16 with loading cycles was in accordance with the exponential and logarithmic models, respectively. The long-term antiskidding performance of the asphalt pavement could be accurately characterized using a stable BPN, loading cycles while reaching a stable BPN, the initial MTD value, and the MTD reduction rate as the evaluation indexes of the skid resistance of asphalt pavement. Compared with limestone fine aggregate, diabase fine aggregate can improve the long-term skid resistance of the asphalt mixtures.

scholarly journals Performance evaluation of Asphalt Rubber Gap-graded mixture

2021 ◽  
Vol 2 (1) ◽  
pp. 26-38
Author(s):  
Akram Hazaa Mohammed Ali Alhelyani ◽  
Zhang Shuwen
Keyword(s):  
Permanent Deformation ◽  
Asphalt Binder ◽  
Fatigue Cracking ◽  
Evaluation Process ◽  
Moisture Susceptibility ◽  
Asphalt Rubber ◽  
Current Design ◽  
Improved Performance ◽  
And Performance

One of the most successful means of improving paving performance is by the use of Crump Rubber (CR). Increased demand for Asphalt Rubber Gap-graded (AR-Gap) mixtures as a pavement material has resulted from improvements in the basic asphalt binder as well as environmental advantages and improved performance in recent years. A number of agencies and researchers conducted AR-Gap mix studies to evaluate the design and performance of AR-Gap mixtures. In this study, the most recent research and practices in the design of AR-Gap mixtures were reviewed, and the performance characteristics of these mixtures were also summarized. In addition, the positive effect of adding ground rubber on the performance of the mixtures, including the effect on fatigue cracking, drainage, moisture susceptibility and permanent deformation is also reviewed. In conclusion, future aims in the building of AR-Gap pavement and performance potential were discussed, which will assist it in becoming a viable long-term pavement choice in the future. Based on the results of the evaluation process, it was discovered that there is still potential to improve the current design state of AR-Gap mixtures as well as the effect of rubber inserts in improving the performance of the mix.

Anti-Skid Thin Layer on Asphalt Pavement of Super Long Downgrades

2011 ◽  
Vol 97-98 ◽  
pp. 611-615 ◽  
Author(s):  
Hong Xin Guan ◽  
Jing Liu ◽  
Qi Sen Zhang ◽  
Cong Jia Xu
Keyword(s):  
Thin Layer ◽  
Early Stage ◽  
Asphalt Pavement ◽  
Skid Resistance ◽  
Safe Driving ◽  
Design Life ◽  
Resistance Performance

Improving the skid resistance performance of asphalt pavement is an effective way to meet the requirements of safe driving on super long continuous downgrades. The anti-skid performance attenuation of SMA-16 was tested in laboratory. The results showed that SMA-16 could meet the requirement of anti-skid performance in early stage, but the anti-skid performance decreased rapidly on super long downgrades. The long-term anti-skid performance of anti-skid thin-layer had also been carried out in laboratory. We can come to conclusion that anti-skid thin paving layer can meet the requirements of anti-skid performance even in the end of design life. The anti-skid thin paving layer on super long downgrades was designed, which not only satisfied the durability of skid resistance performance but also reflected the demand of economics.

scholarly journals Long-term effects of thin layer capping in the Grenland fjords, Norway: Reduced uptake of dioxins in passive samplers and sediment-dwelling organisms

Chemosphere ◽  
2021 ◽  
Vol 264 ◽  
pp. 128544
Author(s):  
Morten Thorne Schaanning ◽  
Bjørnar Beylich ◽  
Jonas S. Gunnarsson ◽  
Espen Eek
Keyword(s):  
Thin Layer ◽  
Passive Samplers ◽  
Long Term Effects

scholarly journals A Comprehensive Evaluation of Rejuvenator on Mechanical Properties, Durability, and Dynamic Characteristics of Artificially Aged Asphalt Mixture

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1554 ◽  
Author(s):  
Pan Pan ◽  
Yi Kuang ◽  
Xiaodi Hu ◽  
Xiao Zhang
Keyword(s):  
Mechanical Properties ◽  
Dynamic Characteristics ◽  
Comprehensive Evaluation ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Physical Property ◽  
Fatigue Property ◽  
Physical Test ◽  
Aged Asphalt

In this study, the aged asphalt binder and mixture were laboratory prepared through short-term ageing testing and long-term ageing testing. Firstly, the effect of rejuvenator on physical properties of aged asphalt binders was investigated. In addition, a series of laboratory tests were performed to evaluate the influence of ageing and rejuvenator content on the mechanical properties, durability and dynamic characteristics of asphalt mixtures. Physical test results of asphalt binder testified that rejuvenator used can efficiently recover the aged asphalt binder. However, the effect of ageing and rejuvenator content exhibits different trends depending on the physical property tests conducted. Moreover, artificially aged asphalt mixture with rejuvenator has better ability to resist moisture damage and ravelling. In addition, the ITSR value is more suitable to evaluate the moisture susceptibility for asphalt recycling. Although rejuvenator improves the thermal cracking resistance and fatigue property of aged asphalt mixture, rejuvenated mixture shows greater modulus and inferior ability to resist reflective cracking than the unaged mixture. Moreover, rejuvenated mixture shows less dependence on frequency at high temperature regions and stronger dependence at low temperature regions compared to unaged and long-term aged mixtures.

scholarly journals Influence of Macrotexture and Microtexture on the Skid Resistance of Aggregates

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Bowen Guan ◽  
Jiayu Wu ◽  
Chao Xie ◽  
Jianhong Fang ◽  
Haile Zheng ◽  
...  
Keyword(s):  
Fractal Dimension ◽  
Correlation Analysis ◽  
Surface Treatment ◽  
Critical Point ◽  
Friction Surface ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Skid Resistance ◽  
Mean Square

This article intends to study the influence of macrotexture and microtexture on the skid resistance of four types of aggregates. For this purpose, fractal dimension (D), root mean square height (Rq), and Polished Stone Value (PSV) were tested. The Pearson correlation coefficients between PSV and D or Rq in the interval of different polishing cycles were calculated and analyzed with correlation analysis. The relationships between PSV and Rq were also established. The results showed that the PSV development was approximately divided into 3 stages including accelerated attenuation stage, decelerated attenuation stage, and stabilization stage. There is a critical point of the entire polishing cycles. When the number of the polishing cycles exceeds this critical point, microtexture replaces macrotexture to play a major role in the skid resistance of aggregates. In the accelerated attenuation stage, macrotexture plays a major role in the skid resistance of aggregates. In the decelerated attenuation stage and stabilization stage, microtexture gradually plays a major role in the skid resistance of aggregates. Because of roughest microtexture in the stabilization stage, bauxite can provide the highest levels of skid resistance for high friction surface treatment over the long-term period.

scholarly journals Long-Term Physical and Mechanical Properties and Microstructures of Fly-Ash-Based Geopolymer Composite Incorporating Carbide Slag

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6692
Author(s):  
Xianhui Zhao ◽  
Haoyu Wang ◽  
Linlin Jiang ◽  
Lingchao Meng ◽  
Boyu Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Room Temperature ◽  
Physical And Mechanical Properties ◽  
Drying Shrinkage ◽  
Fine Aggregate ◽  
Property Development ◽  
Industrial Solid Waste ◽  
Carbide Slag

The long-term property development of fly ash (FA)-based geopolymer (FA−GEO) incorporating industrial solid waste carbide slag (CS) for up to 360 d is still unclear. The objective of this study was to investigate the fresh, physical, and mechanical properties and microstructures of FA−GEO composites with CS and to evaluate the effects of CS when the composites were cured for 360 d. FA−GEO composites with CS were manufactured using FA (as an aluminosilicate precursor), CS (as a calcium additive), NaOH solution (as an alkali activator), and standard sand (as a fine aggregate). The fresh property and long-term physical properties were measured, including fluidity, bulk density, porosity, and drying shrinkage. The flexural and compressive strengths at 60 d and 360 d were tested. Furthermore, the microstructures and gel products were characterized by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). The results show that the additional 20.0% CS reduces the fluidity and increases the conductivity of FA−GEO composites. Bulk densities were decreased, porosities were increased, and drying shrinkages were decreased as the CS content was increased from 0.0% to 20.0% at 360 d. Room temperature is a better curing condition to obtain a higher long-term mechanical strength. The addition of 20.0% CS is more beneficial to the improvement of long-term flexural strength and toughness at room temperature. The gel products in CS−FA−GEO with 20.0% CS are mainly determined as the mixtures of sodium aluminosilicate (N−A−S−H) gel and calcium silicate hydration (C−S−H) gel, besides the surficial pan-alkali. The research results provide an experimental basis for the reuse of CS in various scenarios.

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