scholarly journals Effect of Mixing and Compaction Temperature on Dynamic Modulus of Modified Binder Bituminous Mixtures

2013 ◽  
Vol 104 ◽  
pp. 12-20 ◽  
Author(s):  
Yoga Priyadharshini ◽  
Sonal Maheshwari ◽  
A. Padmarekha ◽  
J. Murali Krishnan
Keyword(s):  
Dynamic Modulus ◽  
Compaction Temperature ◽  
Bituminous Mixtures ◽  
Modified Binder

On measurement of dynamic modulus for bituminous mixtures

2017 ◽  
Vol 20 (9) ◽  
pp. 1073-1089 ◽  
Author(s):  
S. Deepa ◽  
U. Saravanan ◽  
J. Murali Krishnan
Keyword(s):  
Dynamic Modulus ◽  
Bituminous Mixtures

Issues related to measurement of dynamic modulus of bituminous mixtures

2016 ◽  
pp. 119-128
Author(s):  
S. Deepa ◽  
U. Saravanan ◽  
J. Murali Krishnan
Keyword(s):  
Dynamic Modulus ◽  
Bituminous Mixtures

scholarly journals Improving the Temperature Sensitivity of Bitumen for Emergency Pavement Repair

2021 ◽  
Author(s):  
Hayder Al Hawesah ◽  
Monower Sadique ◽  
Clare Harris ◽  
Hassan Al Nageim ◽  
Karl Stopp ◽  
...  
Keyword(s):  
Temperature Sensitivity ◽  
Asphalt Pavement ◽  
High Volume ◽  
Winter Maintenance ◽  
Pavement Maintenance ◽  
Bituminous Mixtures ◽  
Penetration Index ◽  
Modified Binder ◽  
Volume Output ◽  
Reduced Temperature

The quality of asphalt pavement maintenance depends on several important factors, including the selection of patching materials and choice of repair technique. Conventional hot mix plants operate to support large paving projects, and economy favors high-volume output. When repairs and maintenance are needed it can be challenging to maintain small quantities of hot bituminous mixtures at a sufficient temperature, especially in the case of winter maintenance and consequently the repair materials cannot be compacted to the desired level in some occasions. The temperature sensitivity plays a significant factor to understand the asphalt pavement failures and indicates how quickly asphalt properties change over time in terms of indices such as penetration index. Therefore, this research aims to develop a polymer-modified binder with reduced temperature sensitivity, and it can be used for hand-laid application in small quantities for emergency winter repair and maintenance. The results showed that the highest penetration index has been achieved by modifying bitumen with 20% rubber and 2% wax, which is reduced the temperature sensitivity by 168%. Additionally, the Fourier Transform Infrared Spectroscopy (FTIR) test and X-Ray Diffraction (XRD) test were conducted to monitor the changes in the chemical composition and identify crystalline phases of polymer modified binder from the aspect of functional groups. It is indicated that the bitumen, rubber, and wax react chemically to build 3D networks that have an interlaced form in the bitumen matrix resulting in reduced temperature sensitivity of the polymer modified binder.

Challenges Associated with Optimisation of Blending, Mixing and Compaction Temperature for Asphalt Mixture Modified with Crumb Rubber Modifier (CRM)

2012 ◽  
Vol 256-259 ◽  
pp. 1837-1844 ◽  
Author(s):  
Iman Mohammadi ◽  
Hadi Khabbaz
Keyword(s):  
Asphalt Mixture ◽  
Crumb Rubber ◽  
Test Methods ◽  
Asphalt Binders ◽  
Asphalt Pavements ◽  
Compaction Temperature ◽  
Modified Asphalt ◽  
Wide Range ◽  
Modified Binder ◽  
Very High

The use of modified asphalt binders has become much more common over the past two decades. Many types of modifier have been used in paving asphalts to enhance the performance of asphalt pavements in a wide range of climates and loading conditions. Among various asphalts binder modifiers, the recycled crumb rubber has been used very successfully for many years. Generally in production of CRM binder, mixing and compaction temperature is determined by measuring of binder viscosity. The ordinary method used for viscosity measurement of unmodified binder leads to a very high Mixing and Compaction Temperature (MCT) for CRM binder. The aims of this paper are to identify, develop and give some recommendations on a reliable laboratory approach for blending of CRM with binder, as well as introducing appropriate laboratory test methods for optimisation of MCT of crumb rubber modified binder asphalt.

scholarly journals Synergistic Effect of F–T Synthetic Wax and Surface-Active Agent Content on the Properties and Foaming Characteristics of Bitumen 50/70

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 300
Author(s):  
Mateusz M Iwański
Keyword(s):  
Surface Active Agent ◽  
Active Agent ◽  
Road Construction ◽  
Test Results ◽  
Chemical Additives ◽  
Maximum Expansion ◽  
Bituminous Mixtures ◽  
Surface Active ◽  
Foamed Bitumen ◽  
Modified Binder

The level of the properties of bituminous mixtures produced with water foamed bitumen relies on the optimum characteristics of the bitumen. One way to achieve the desired characteristics is to modify the bitumen with chemical additives before it is foamed. Bitumen 50/70 treated with a surface-active agent (SAA) at 0.2%, 0.4% and 0.6% and Fischer–Tropsch (F–T) synthetic wax at 1.5%, 2.0%, 2.5% and 3.0% was used in the tests. The effect of the modifiers was investigated by assessing bitumen properties (penetration, softening point, Fraass breaking point and dynamic viscosity at 60 °C, 90 °C and 135 °C) and foam parameters (maximum expansion—ER, half-life—HL). For statistical evaluation of the test results, models of the properties of bitumen 50/70 were developed as a function of the contents of F–T synthetic wax and SAA. It was found that 2.0% F–T wax and 0.6% SAA were optimum contents for achieving the desired standard properties and foam characteristics of the tested binder. The developed models allow determining the composition of the modified binder depending on the required foam characteristics for specific applications in road construction. The recommended composition of the chemical additives used to modify the binder was also established to ensure its optimum properties.

scholarly journals Effect of Sodium Chloride on the Modulus and Fatigue Life of Bituminous Mixtures

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2126
Author(s):  
Luis Juli-Gándara ◽  
Ángel Vega-Zamanillo ◽  
Miguel Ángel Calzada-Pérez ◽  
Evelio Teijón-López-Zuazo
Keyword(s):  
Fatigue Life ◽  
Sodium Chloride ◽  
Dynamic Modulus ◽  
Hot Mix Asphalt ◽  
Resilient Modulus ◽  
Salt Water ◽  
Decisive Role ◽  
Bituminous Mixture ◽  
Bituminous Mixtures ◽  
Reference Mixture

Bituminous mixtures are not perfectly elastic materials, so their viscoelastic properties play a decisive role in knowing their behavior. This research aims to find out this behavior through the values of the resilient modulus, the dynamic modulus, and the fatigue life for asphalt concrete and porous mixtures when they are influenced by the presence of salt (NaCl, sodium chloride). The aforementioned influence of salt has been evaluated by utilizing three different methods: submerging specimens of bituminous mixture in salt water; introducing salt into the specimens as if it was aggregate and immersing the aggregate in salt water; and drying it and then manufacturing the bituminous mixture with it. As the results indicate, the mixtures submerged in salt water do not show large differences in comparison to the reference mixtures for hot mix asphalt and porous mixtures. However, for hot mix asphalt in which salt has been added as aggregate, the resilient modulus is greater than in the reference mixture. For the bituminous mixtures in which an aggregate saturated in salt water has been used for its manufacture, the results of the resilient modulus test, dynamic modulus test, and fatigue life test are lower than in the reference mixture, especially when the specimens are submerged.

scholarly journals Laboratory Study on Properties of Tire Crumb Rubber Modified Bituminous Mixture

2012 ◽  
Vol 5 ◽  
pp. 219-223
Author(s):  
Yu Ming Dong ◽  
Yi Qiu Tan
Keyword(s):  
Dynamic Modulus ◽  
Performance Test ◽  
Resilient Modulus ◽  
Viscoelastic Behavior ◽  
Crumb Rubber ◽  
Bending Test ◽  
Bituminous Mixture ◽  
Bituminous Mixtures ◽  
Dynamic Modulus Test ◽  
Mechanical Performances

Abstract: This paper investigates the laboratory properties of tire crumb rubber modified (CRM) bitumen mixture. Two types of mixtures containing two binders (pen90 bitumen; CRM bitumen) were used to produce Marshall Sample and determine optimum content. Mechanical performances of bituminous mixtures were evaluated by Chinese wheel rutting test (WRT), 3point beam bending test (3P-BBT) at low temperature, indirect tensile Strength test (ITST) at freezing-thawing cycles. Superpave gyratory compactor (SGC) specimens also were prepared for modulus test. Resilient modulus (E) data were obtained by unconfined uni-axial compression test according to the specification of China. Dynamic modulus (E★) data were obtained by Simple Performance Test (SPT). Two temperatures were used at dynamic modulus test. The results indicate that CRM bituminous mixture performs better than referenced bituminous mixture on viscoelastic behavior, rutting resistance, cracking resistance and moisture stability.

Sign in / Sign up

Export Citation Format

Share Document