Refinement of Flow Number as Determined by Asphalt Mixture Performance Tester

2009 ◽  
Vol 2127 (1) ◽  
pp. 127-136 ◽  
Author(s):  
Raj Dongré ◽  
John D'Angelo ◽  
Audrey Copeland
Keyword(s):  
Asphalt Mixture ◽  
Flow Number ◽  
Asphalt Mixture Performance Tester

EVALUATION OF THE HIRSCH MODEL FOR DYNAMIC MODULUS ESTIMATION OF ASPHALT MIXTURES

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Hassan Malekzehtab ◽  
Hamid Nikraz
Keyword(s):  
Western Australia ◽  
Dynamic Modulus ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Recycled Asphalt ◽  
Asphalt Mixture Performance Tester ◽  
Comparison Of The Results ◽  
Asphalt Concrete Pavement ◽  
Cylindrical Samples ◽  
Do So

The dynamic modulus of the asphalt mixtures is an important factor in designing or analyzing an asphalt concrete pavement, but it is expensive and time consuming to measure. Therefore, it is important to develop a model to predict this value. In this regard, the Hirsch model is a popular model, however, it is developed based on a range of U.S. asphalt mixtures and standards. Therefore, it is not certain that it can be used for asphalt mixtures based on materials and codes other than U.S. This article investigated whether this model performs satisfactorily with two typical asphalt mixtures in Western Australia (WA) containing 0, 10, 20, and 30% of recycled asphalt pavement. To do so, cylindrical samples were made with materials and locally established standards in Western Australia and then tested in Asphalt Mixture Performance Tester (AMPT) machine to acquire their dynamic modulus and phase angle values in different loading frequencies (0.01 to 10 Hz) and temperatures (4 to 40°C). Meanwhile, the results are estimated by the Hirsch model using some properties of the mixture and binder. The properties of the binder in different test conditions are obtained using a dynamic shear rheometer. The comparison of the results showed that the dynamic modulus underestimation or overestimation error can reach to 50 and 280% respectively. Generally, this model did not perform well in this study.

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 The Potential use of Crumb Rubber in Hot Asphalt Mixes in Egypt using Dry Process

2019 ◽  
Vol 9 (1) ◽  
pp. 4356-4360
Keyword(s):  
Mechanical Properties ◽  
Permanent Deformation ◽  
Asphalt Mixture ◽  
Road Construction ◽  
Crumb Rubber ◽  
Flow Number ◽  
Storage Container ◽  
Dry Process ◽  
Wet Process ◽  
Process Method

Since 1960 Using crumb rubber modifier (CRM) in hot asphalt mixtures has become a frequent practice in road construction. Using the CRM by the dry process method is not commonly used, although it has great advantages such as it is less fuel consuming and it does not require storage container like the wet process method. This research evaluates the mechanical properties of dense graded asphalt rubber mixtures manufactured using the dry process. The results obtained from this mixture compared with similar asphalt mixture without CRM. The mechanical properties of all mixtures evaluated using a set of tests such Marshall Stability and flow test, moisture susceptibility test, indirect tensile strength test, dynamic modulus and flow number test. The research results showed that using CRM with 0.75% of aggregate’s weight increased the mixture’s stability, flow and enhanced its cracking and permanent deformation resistance.

The effects of asphalt migration on the flow number of asphalt mixture

2019 ◽  
Vol 226 ◽  
pp. 442-448 ◽  
Author(s):  
Hui Wang ◽  
Shihao Zhan ◽  
Guojun Liu ◽  
Junwei Xiang
Keyword(s):  
Asphalt Mixture ◽  
Flow Number

scholarly journals Evaluation and Comparison of Mechanical Properties of Polymer-Modified Asphalt Mixtures

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2282
Author(s):  
Hamad Abdullah Alsolieman ◽  
Ali Mohammed Babalghaith ◽  
Zubair Ahmed Memon ◽  
Abdulrahman Saleh Al-Suhaibani ◽  
Abdalrhman Milad
Keyword(s):  
Mechanical Properties ◽  
Asphalt Mixture ◽  
Mechanical Tests ◽  
Polymer Modification ◽  
Flow Number ◽  
Study Objective ◽  
Asphalt Cement ◽  
Modified Asphalt ◽  
Pavement Distresses ◽  
Polymer Modified Asphalt

Polymer modification is extensively used in the Kingdom of Saudi Arabia (KSA) because the available asphalt cement does not satisfy the high-temperature requirements. It was widely used in KSA for more than two decades, and there is little information regarding the differences in the performance of different polymers approved for binder modification. Pavement engineers require performance comparisons among various polymers to select the best polymer for modification rather than make their selection based on satisfying binder specifications. Furthermore, the mechanical properties can help select polymer type, producing mixes of better resistance to specific pavement distresses. The study objective was to compare the mechanical properties of the various polymer-modified asphalt (PMA) mixtures that are widely used in the Riyadh region. Control mix and five other mixes with different polymers (Lucolast 7010, Anglomak 2144, Pavflex140, SBS KTR 401, and EE-2) were prepared. PMA mixtures were evaluated through different mechanical tests, including dynamic modulus, flow number, Hamburg wheel tracking, and indirect tensile strength. The results show an improvement in mechanical properties for all PMA mixtures relative to the control mixture. Based on the overall comparison, the asphalt mixture with polymer Anglomk2144 was ranked the best performing mixture, followed by Paveflex140 and EE-2.

Practical Method to Determine Strain Level for Cyclic Direct Tension Fatigue Testing in the Asphalt Mixture Performance Tester

2017 ◽  
Vol 2631 (1) ◽  
pp. 133-143 ◽  
Author(s):  
Sean (Xinjun) Li ◽  
David J. Mensching ◽  
Nelson Gibson
Keyword(s):  
Phase Angle ◽  
Fatigue Testing ◽  
Asphalt Mixture ◽  
Practical Method ◽  
Fatigue Tests ◽  
Strain Level ◽  
Direct Tension ◽  
Experimental Database ◽  
Asphalt Mixture Performance Tester ◽  
Peak Phase

This paper presents a practical procedure for estimating strain levels in the asphalt mixture performance tester cyclic direct tension fatigue test and provides practitioners with guidance for selecting a strain value for testing materials with unknown fatigue characteristics. A large variety of plant-produced and laboratory-prepared mixtures were analyzed. These included hot- and warm-mix asphalt, reclaimed asphalt pavement, and recycled asphalt shingles and various gradations and air void contents; all were tested following the AASHTO TP 107 procedure. The experimental results from a segregated material illustrate that AASHTO TP 107 could produce repeatable results and was sensitive to field variations in binder content. Data for satisfactorily performing and poorly performing mixtures were clustered on the plot of cycles to peak phase angle versus actuator strain level and a Black Space diagram evaluated at the AASHTO TP 107 test temperature. Curves of cycles to peak phase angle versus actuator strain level were built from the experimental database, with each curve representing one ideal mixture that followed a particular power function. The dynamic modulus data are used to determine a recommended actuator strain level to start the set of fatigue tests for each cluster.

Evaluation of Asphalt Mixture Performance Tester

2012 ◽  
Vol 2296 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Levi Roberts ◽  
Pedro Romero ◽  
Kevin VanFrank ◽  
Ryan Ferrin
Keyword(s):  
Asphalt Mixture ◽  
Asphalt Mixture Performance Tester
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