Effects of Warm Mix Asphalt (WMA) Additives on the Properties of WMA Mixtures

2013 ◽  
Vol 275-277 ◽  
pp. 2097-2102 ◽  
Author(s):  
Hong Zhu ◽  
Zhao Xing Xie ◽  
Wen Zhong Fan ◽  
Li Li Wang ◽  
Ju Nan Shen
Keyword(s):  
Dynamic Stability ◽  
Laboratory Testing ◽  
Failure Strain ◽  
Asphalt Mixture ◽  
Warm Mix Asphalt ◽  
Air Voids ◽  
Modified Asphalt ◽  
Modified Binder ◽  
Bending Failure ◽  
Sbs Modified Asphalt

The objective of this research was to investigate the influence of Warm Mix Asphalt (WMA) additives on asphalt mixture properties through the laboratory testing programs such as air voids, tensile strength ratio (TSR), dynamic stability, and low temperature bending failure strain tests. The experimental design included the use of three WMA additives of Sasobit, Evotherm and Rediset, one base (unmodified) binder source, and one modified binder source. The WMA mixtures were compared to those of controls, i.e., mixtures without the additives. Results from this study showed that: (1) WMA mixtures with Rediset, Evotherm, and Sasobit had slightly higher air voids than Hot Mix Asphalt （HMA）; (2) All WMA mixtures with SBS modified asphalt have lower TSR values than the original ones. The TSR of the WMA mixtures with base (unmodified) asphalt is not significantly different from HMA; (3) The WMA mixtures with SBS modified asphalt have lower values of the dynamic stability and bending failure strain than HMA, while the WMA mixtures with base asphalt are contrary, except with Rediset additives.

Study on Influences of Warm-Mix Agent on SBS Modified Asphalt Mixture

2013 ◽  
Vol 361-363 ◽  
pp. 1805-1810
Author(s):  
Xiao Yan Song ◽  
Yuan Yuan Li ◽  
Qiang Hua Ji
Keyword(s):  
Hot Mix Asphalt ◽  
Asphalt Mixture ◽  
Warm Mix Asphalt ◽  
Pavement Performance ◽  
Water Stability ◽  
Mixing Ratio ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Sbs Modified Asphalt ◽  
Factor G

Through conventional and unconventional tests, the influences of self-developed warm-mix agent on the performances of SBS modified asphalt are studied. The results show that the warm-mix agent has great influences on the ductility and aging quality changes of SBS modified asphalt; and the warm-mix agent can improve the asphalt rutting factor G*/sinδ and fatigue factor G* • sinδ. The mixing ratio of the warm-mix SBS modified asphalt mixture is designed based on GTM method and the pavement performance is compared and verified. The results show that: in terms of high temperature performance, the warm-mix asphalt mixture is superior to the corresponding hot-mix asphalt mixture; and in terms of low temperature performance and water stability, the former is equivalent to the latter.

The Effect of Compaction Temperature on Volume Parameters of Warm Asphalt Mix with Sosabit

2011 ◽  
Vol 255-260 ◽  
pp. 3249-3253
Author(s):  
Hui Dou ◽  
Bo Li ◽  
Wen Hong Ren ◽  
Qiang Wang
Keyword(s):  
Asphalt Mixture ◽  
Warm Mix Asphalt ◽  
Asphalt Mixtures ◽  
Volumetric Properties ◽  
Regulatory Requirements ◽  
Compaction Temperature ◽  
Air Voids ◽  
Modified Asphalt ◽  
Asphalt Mix ◽  
Lower Temperature

The volume parameters of asphalt mixtures is sensitive to compaction temperature. Warm-mix Asphalt (WMA) was green paving technology, which can allow paving at lower temperature. In this study, a laboratory investigation of the volumetric properties of WMA with Sosabit was carried out by the method of Marshall. And the effect of different asphalt such as modified asphalt such as Kalamay, Shell, SK and Kalamay 90# asphalt on volumetric properties of WMA at different temperature was analyzed. Based on this, the minimum compaction temperatures of WMA with Sosabit was proposed. The result showed that bulk density and VFA are decreasing and air voids and VMA increasing with the decreasing temperature; the volume indicators to meet the regulatory requirements when the temperature is 170°C~143°C for three WMA-SBS temperature and 150°C~115°C for WMA-90#; compaction temperatures of modified asphalt and asphalt mixture after adding Sosabit can lower up to 133°C and 118°C respectively.

Study on Low-Temperature Performance of Asphalt Mixture Impacted by Modified Asphalt and Polyester Fibers

2012 ◽  
Vol 204-208 ◽  
pp. 3886-3889
Author(s):  
Xun Yu ◽  
Jing Bo Huang
Keyword(s):  
Low Temperature ◽  
Crack Resistance ◽  
Strain Energy ◽  
Failure Strain ◽  
Asphalt Mixture ◽  
Modified Asphalt ◽  
The Road ◽  
On The Road ◽  
Fracture Stiffness ◽  
Sbs Modified Asphalt

Low temperature crack plays an important role on the road safety and comfort. Indoor experiments were carried out to study the crack resistance of asphalt mixture. The results show that: fiber and SBS modified asphalt can increase the failure strain energy, the failure stress and the failure strain and reduce stiffness, thus can significantly improve the anti-cracking ability at low temperature; at a critical temperature of about -10°C, the splitting strength achieve a peak value correspondingly, and the asphalt mixture transforms from the viscoelastic status to the brittle status; the failure load and the failure strain of the three kinds of mixtures are in the sequence of modified asphalt mixture> fiber mixture> common asphalt mixture; the results of the J-integral strain energy test show that fiber asphalt mixture has the maximum resistance curve slope, which means it may have better anti-cracking ability than the SBS modified asphalt mixture; the fracture stiffness can be introduced to effectively evaluate the crack resistance of asphalt mixture.

Properties of Porous Asphalt Mixture Made with Styrene Butadiene Styrene under Long Term Oven Ageing

2012 ◽  
Vol 486 ◽  
pp. 378-383 ◽  
Author(s):  
Che Wan Che Norazman ◽  
Ramadhansyah Putra Jaya ◽  
Meor Othman Hamzah
Keyword(s):  
Resilient Modulus ◽  
Asphalt Mixture ◽  
Test Results ◽  
Air Voids ◽  
Porous Asphalt ◽  
Coefficient Of Permeability ◽  
Modified Binder ◽  
Styrene Butadiene ◽  
Butadiene Styrene

Oven ageing is a set of procedure to simulate the accelerated effects of ageing on pavements structures. In this study, the effect of long-term oven ageing on porous asphalt mixture made with SBS modified binder was investigated. The resilient modulus, water permeability and air voids test results were the performance indicators used to evaluate the effects of ageing. The test results showed that, the resilient modulus of long term aged specimens was higher than those of unaged specimens. From the permeability test results, unaged SBS mixes exhibit lower coefficient permeability compared to the corresponding long-term oven age specimens. Most likely, ageing caused binder hardening, making the mix more difficult to compact and hence exhibited more continuous voids which in turn lead to higher permeability. In addition, the coefficient of permeability decreases as the binder content increased.

Application on Fiber-Enhanced Asphalt Mixture in Surface Layer of Large Longitudinal Slope Pavement of Xi-Sang Highway

2014 ◽  
Vol 599 ◽  
pp. 282-286 ◽  
Author(s):  
Chun Gang Zhang ◽  
Yan Jun Xie ◽  
Lin Chun Meng ◽  
Qin Yong Li
Keyword(s):  
Surface Layer ◽  
High Temperature ◽  
Low Temperature ◽  
Dynamic Modulus ◽  
Asphalt Mixture ◽  
Modified Asphalt ◽  
Longitudinal Slope ◽  
Sbs Modified Asphalt ◽  
Test Result ◽  
Temperature Dynamic

This paper investigated into the application of fiber-enhanced asphalt mixture in surface layer of the large longitudinal slope pavement of Xi-Sang Highway. Asphalt mixture with and without polyester fiber were used. Focus is on resistance of deformation at high temperature and flexibility at low temperature. Fiber-enhanced asphalt mixture with dynamic stability above 7000 passes/mm indicated excellent rutting resistance. The high temperature dynamic modulus of fiber-enhanced asphalt mixture was much higher than conventional SBS modified asphalt mixture. Three-point blending test result indicated that the maximum flexural strain of fiber-enhance asphalt mixture reached 4180μm/m. It was concluded that fiber-enhanced asphalt mixture was suit to be used in surface layer of the large longitudinal slope pavement of Xi-Sang Highway.

scholarly journals High Temperature Performance of SBS and LM-S Modified Asphalt Mixtures by Triaxial Test

2021 ◽  
Vol 293 ◽  
pp. 02029
Author(s):  
Tang-Baoli ◽  
Ren-yongqiang ◽  
Chen-Xiangmei ◽  
Hou-Huifang ◽  
Liang-Jianping
Keyword(s):  
High Temperature ◽  
Creep Rate ◽  
Permanent Deformation ◽  
Asphalt Mixture ◽  
Deviatoric Stress ◽  
Repeated Loading ◽  
Flow Number ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Sbs Modified Asphalt

In order to study the high temperature performance of LM-S modified asphalt mixture and SBS modified asphalt mixture, repeated loading creep test was used to study the influence of temperature and deviatoric stress on the axial permanent deformation of the two kinds of asphalt mixture. At the same time, Permanent deformation, ε@5000, flow number FN and creep rate were select to evaluation of high temperature performance from different directions. The results show that the ε@5000 and creep rate are failed in the condition of high temperature and large deviatoric stress, so it hast widely practicable. The flow number FN is also limited by the conditions, which leads to the distortion of the flow number at lower temperature and smaller deviatoric stress so it is not easy to direct used as the evaluation index. Axial permanent deformation can reflect the permanent deformation in different cycles which is an excellent index to evaluate the high temperature performance of the two kinds of asphalt mixture, it is recommended to use axial permanent deformation to compare the LM-S modified asphalt mixture and SBS modified asphalt mixture The experimental results show that the axial permanent deformation of the LM-S modified asphalt mixture is always less than that of SBS modified asphalt mixture,it indicating that the high temperature rutting resistance of the LM-S modified asphalt mixture is better than that of SBS modified asphalt mixture.

scholarly journals Selecting warm mix asphalt additives by the properties of warm mix asphalt mixtures - China experience

2015 ◽  
Vol 10 (1) ◽  
pp. 79-88 ◽  
Author(s):  
Xinsheng Li ◽  
Zhaoxing Xie ◽  
Wenzhong Fan ◽  
Lili Wang ◽  
Junan Shen
Keyword(s):  
Tensile Strength ◽  
Dynamic Stability ◽  
Asphalt Concrete ◽  
Warm Mix Asphalt ◽  
Asphalt Mixtures ◽  
Air Voids ◽  
Mastic Asphalt ◽  
Stone Mastic Asphalt ◽  
Crushed Aggregate ◽  
Marshall Stability

The objective of this research was to select the most effective warm asphalt additives for mix practice based on a series of laboratory testing programs such as density, Marshall stability, freeze-thaw splitting strength, dynamic stability, and bending beam strain. The experimental design of warm mix asphalt included the use of three commonlyused additives, two typical aggregate gradations, one crushed aggregate, and one modified asphalt. Results showed that: (1) the bulk specific gravity and air voids of all the mix specimens were similar to those of controls; (2) the Marshall stability and flow values of the warm stone mastic asphalt were 6.8%–26.6% and 3.5%–10.3%% higher than those of controls, respectively, and those of the warm asphalt concrete were 6.1%–15.6% and 6.5%–9.7% higher than those of controls, respectively; (3) the indirect tensile strength of two types of mixtures was 1.7%–14.4% lower than that of controls, and the average tensile strength ratio of the warm stone mastic asphalt and asphalt concrete was 4.3% and 1.3% higher than that of controls, respectively; (4) the dynamic stability of warm mix specimens was 10.8%–16.6% lower than that of the controls; (5) the average bending failure strain of warm stone mastic asphalt was 7.6% higher than that of the controls, and that of warm asphalt concrete was 12.8% lower than that of the controls; (6) Overall, warm asphalt mixtures with Sasobit and Rediset had relatively best performances required in Southeast China, where rutting and stripping are the main failures of asphalt pavements.

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