The Role of Asphalts in Rational Mix Design and Pavement Performance

2008 ◽  
pp. 72-72-14
Author(s):  
BE Ruth ◽  
M Tia ◽  
K Badu-Tweneboah
Keyword(s):  
Mix Design ◽  
Pavement Performance

scholarly journals Effects of Asphalt Mix Design Properties on Pavement Performance: A Mechanistic Approach

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Ahmad M. Abu Abdo ◽  
S. J. Jung
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Pavement ◽  
Binder Content ◽  
Mix Design ◽  
Pavement Performance ◽  
Dynamic Shear Modulus ◽  
Test Results ◽  
Analysis Software ◽  
Mechanistic Approach ◽  
Asphalt Mix

The main objective of this study was to investigate the effects of hot mix asphalt material properties on the performance of flexible pavements via mechanistic approach. 3D Move Analysis software was utilized to determine rutting and cracking distresses in an asphalt concrete (AC) layer. Fourteen different Superpave mixes were evaluated by utilizing results of the Dynamic Modulus (|E⁎|) Test and the Dynamic Shear Modulus (|G⁎|) Test. Results showed that with the increase of binder content, the tendency of rutting in AC layer increased. However, with the increase of binder content, the cracking of AC layer lessened. Furthermore, when different binder grades were evaluated, results showed that with the increase of the upper binder grade number, rutting decreased, and with the increase of the lower binder grade number, rutting increased. Furthermore, analysis showed that with the increase of the lower binder grade number, higher percent of bottom up cracks would result. As a result of the analysis, binder grade should not be solely considered for cracking in AC layer; binder content and aggregate structure play a big role. Finally, results illustrated that the mechanistic approach is a better tool to determine the performance of asphalt pavement than commonly used methods.

Pavement Performance of Low Dosage Cement Stabilized Gravel Powder Mixed with Aggregates

2013 ◽  
Vol 668 ◽  
pp. 48-52 ◽  
Author(s):  
Chuan Yi Zhuang ◽  
Ya Li Ye
Keyword(s):  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Mix Design ◽  
Pavement Performance ◽  
Economic Factors ◽  
Engineering Project ◽  
Design Strength ◽  
Test Analysis ◽  
Mixed Aggregates ◽  
Low Dosage

On the basis of test analysis, mix design of cement stabilized gravel powder, cement stabilized gravel powder mixed with 20% aggregates and cement stabilized gravel powder mixed with 40% aggregates were compared, their unconfined compressive strength were tested, and the mixed aggregates ratio and mix design were ultimately determined. The experimental results show that mixing a certain amount of aggregate can reduce cement dose and meet the design strength. Engineering project cost by mixing with a certain amount of aggregate was little higher than that of cement stabilized gravel powder. Comprehensively considering technical and economic factors, the recommended amount of aggregates mixed with 30% and cement dose of 2%.

scholarly journals Gradation Characteristics-Based Interlayer Mixture Design Method for Enhanced Rutting Resistance of Asphalt Pavements

2021 ◽  
Author(s):  
Bongsuk Park ◽  
Cristian Cocconcelli ◽  
Sanghyun Chun
Keyword(s):  
Size Range ◽  
Design Method ◽  
Aggregate Size ◽  
Mix Design ◽  
Asphalt Pavements ◽  
Test Results ◽  
Reflective Cracking ◽  
Low Stiffness ◽  
Materials Used

The major role of interlayer mixtures is to mitigate reflective cracking by absorbing or dissipating concentrated stress, and relatively low-stiffness materials are typically used. However, there is a concern that interlayer mixtures may increase rutting potential due to the low-stiffness materials used. The dominant aggregate size range (DASR) porosity has been successfully applied for structural mixtures to ensure enhanced rutting performance. This study mainly focused on developing the new DASR porosity requirement for interlayer mixtures that ensure acceptable rutting performance in the mix design phase. Ten interlayer mixtures with a broad range of DASR porosities were evaluated using the asphalt pavement analyzer test. Results indicated that the gradation characteristics of interlayer mixtures played an important role in rutting performance. Also, a relationship between DASR porosity and the rutting potential of interlayer mixtures was identified that resulted in the establishment of the preliminary DASR porosity requirements.

scholarly journals The role of temperature differential and subgrade quality on stress, curling, and deflection behavior of rigid pavement

2020 ◽  
Vol 29 (1) ◽  
pp. 94-105
Author(s):  
Dian M. Setiawan
Keyword(s):  
Weather Conditions ◽  
Concrete Pavement ◽  
Pavement Performance ◽  
Temperature Differential ◽  
Mechanical Behaviors ◽  
Rigid Pavement ◽  
K Value ◽  
Deflection Analysis ◽  
Higher Temperature

AbstractTo determine performance of rigid pavement, pavement engineers should not only conduct stress, curling, and deflection analysis, but also understand weather conditions and subgrade quality effects on rigid pavement performance well. This study aims to analyze and visualize the mechanical behaviors of rigid pavement in terms of stress, curling, and deflection using the KENPAVE Program under different curling temperature and subgrade quality. Besides, this study also evaluated temperature differential and k-value effects on the stress, curling, and deflection behavior of concrete pavement. The findings revealed that there is a linear correlation between stress and both k-value and curling temperature, with the latter having more significant impact in controlling stress than the former. However, even though curling is not affected by subgrade quality, it significantly depends on the temperature differential since a higher curling temperature produces higher curling behavior. Lastly, a higher temperature differential produces greater deflection, but a higher k-value produces smaller deflection. Nevertheless, deflection behavior has a more significant curve and the position of the highest deflection shifted towards the center of the slab as the curling temperature and subgrade quality increase.

Rheology of Asphaltic Binders and Their Effects on Asphalt Concrete

1996 ◽  
Vol 1535 (1) ◽  
pp. 74-80
Author(s):  
Rong-Bin Jiang ◽  
Jyh-Dong Lin ◽  
Deng-Fong Lin
Keyword(s):  
Asphalt Concrete ◽  
Performance Test ◽  
Mix Design ◽  
Pavement Performance ◽  
Processing Temperature ◽  
Test Results ◽  
Higher Temperature ◽  
Tan Δ ◽  
Mineral Fillers

The rheology of asphaltic binders and their effects on asphalt concrete are discussed with the intention of improving the correlation between conventional mix design results and pavement performance. Test results show that mineral fillers increase the viscosity and pseudoplasticity of asphalts but do not always decrease the tan 8, except apparently at a lower frequency or at a higher temperature. Mineral fillers are also hard to mix homogeneously and quickly with asphalts. All these effects become more pronounced with a continuously increasing filler to asphalt (F/A) ratio, and uses are limited to a lower F/A range unless the processing temperature is adjusted properly. The abnormal drop in tan δ improves for some modified asphalts (e.g., air-blown or polymerized asphalt).

scholarly journals Effects of Composite Warm Mix Additive (CAR) on the Physical and Rheological Performance of Bitumen and the Pavement Performance of Its Concrete

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3916
Author(s):  
Jizhe Zhang ◽  
Peizhao Li ◽  
Changjun Sun ◽  
Ming Liang ◽  
Yuanyuan Li ◽  
...  
Keyword(s):  
Cationic Surfactants ◽  
Warm Mix Asphalt ◽  
Organic Additive ◽  
Pavement Performance ◽  
Bituminous Mixtures ◽  
Performance Grade ◽  
Bending Strain ◽  
Temperature Performance ◽  
Bituminous Concrete

Warm mix asphalt received increasing attention in recent years, and this technology aims to increase the fluidity of bitumen in the process of mixing and construction. To characterize the physical and rheological properties of bitumen and the pavement performance of bituminous mixtures, it was modified by a composite additive Rediset. Rediset consists of both the cationic surfactants and organic additive-based rheology modifiers. Commonly used materials such as Pen 60/80 bitumen and bituminous concrete (AC-20) were selected. The results show that Rediset can improve the penetration and softening point of the bitumen, making the bitumen stiffer and harder. All Rediset-modified bituminous concretes are in the same low-temperature performance grade (PG) as the bitumen without Rediset. Although Rediset can decrease the rutting and crack resistance of Rediset-modified bituminous concrete, all the Rediset-modified bituminous concrete with less than 2% Rediset still satisfied the requirement of the maximum bending strain being higher than 2000 με, and the dynamic stability of Rediset-modified bituminous concrete with 3% Rediset was still higher than 1000 cycles/mm. The cationic surfactants in the Rediset can play the role of an anti-stripping agent and improve the adhesion between the interfaces of the aggregate and bituminous binder, which enhances the moisture resistance of Rediset-modified bituminous concrete.

Sign in / Sign up

Export Citation Format

Share Document