Physical Properties of Tall Oil Pitch Modified Asphalt Cement Binders

2009 ◽  
pp. 214-214-12 ◽  
Author(s):  
RA Johnson ◽  
AG Juristovski
Keyword(s):  
Physical Properties ◽  
Tall Oil ◽  
Asphalt Cement ◽  
Modified Asphalt

Physical Properties of Modified Asphalt Binder with Nanopolyacrylate

InCIEC 2013 ◽  
2014 ◽  
pp. 389-398 ◽  
Author(s):  
E. Shaffie ◽  
J. Ahmad ◽  
A. K. Arshad ◽  
D. Kamarun ◽  
F. Kamaruddin ◽  
...  
Keyword(s):  
Physical Properties ◽  
Asphalt Binder ◽  
Modified Asphalt ◽  
Modified Asphalt Binder

Evaluation of Crumb Rubber Modification on Specification Compliance of Asphalt Mixtures

2019 ◽  
Vol 2673 (3) ◽  
pp. 540-550
Author(s):  
Samuel Cooper ◽  
Saman Salari ◽  
David Mata
Keyword(s):  
Crumb Rubber ◽  
Asphalt Cement ◽  
Modified Asphalt ◽  
Open Graded Friction Course ◽  
Cracking Performance ◽  
Asphalt Content ◽  
And Performance ◽  
Styrene Butadiene ◽  
The Impact ◽  
Rubber Modification

Since 2008, the Louisiana Department of Transportation and Development (LaDOTD) has allowed the use of crumb rubber modification (CRM) as per the specifications. However, the introduction of CRM has presented unique challenges during design and production. LaDOTD districts have reported early cracking for dense-graded mixtures. Adhesion and stability issues have been reported for open-graded friction course (OGFC) and stone matrix asphalt (SMA) mixtures. Currently, LaDOTD specifications allow the contractor to switch asphalt cement supplies without redesigning the mixture. This study evaluated several CRM-modified mixture designs to address design and performance concerns; it also evaluated the volumetric and mechanistic properties of dense, SMA, and OGFC mixtures designed with unmodified asphalt cement, styrene-butadiene-styrene-modified asphalt cement and five crumb rubber sources. SuperPave volumetric parameters were evaluated to ascertain the impact of CRM on the design of these mixtures. Rutting and intermediate temperature cracking susceptibility were determined using the Hamburg Loaded Wheel Tracker (LWT) and semi-circular bend test (SCB), respectively. Solvent extraction and the ignition furnace were used to determine the asphalt content of the modified mixtures. The results showed that CRM improved the laboratory rutting resistance of the mixtures. However, the laboratory cracking resistance was decreased for the CRM-modified mixtures. Based on statistical analysis, additional asphalt content, reduced CRM dosage, and the use of polymer additives may mitigate the reduced laboratory cracking performance of the CRM-modified mixtures. The volumetric parameters were also affected by CRMs. The mixtures should be re-designed if the contractor anticipates using a CRM-modified asphalt cement.

Predicting a Model for Modified Asphalt Cement Rutting Parameters

2021 ◽  
Vol 895 ◽  
pp. 1-11
Author(s):  
Mohammed Abbas Al-Jumaili ◽  
Hamid Athab Al-Jameel
Keyword(s):  
Asphalt Mixtures ◽  
Dynamic Shear ◽  
Asphalt Cement ◽  
Modified Asphalt ◽  
Aged Asphalt ◽  
Modified Binders ◽  
Predicted Model ◽  
Asphalt Paving ◽  
The Relationship ◽  
Wheel Track

This paper aims to investigate the relationship between the Superpave rutting parameter of asphalt (G﹡/sin δ) by conducting Dynamic Shear Rheometer (DSR) tests with the rut depth values obtained by the wheel track device. The twenty asphalt mixtures have been prepared with twenty types of unmodified asphalts and Polymer-Modified Binders (PMBs). SBS was used to produce PMBs. The twenty base and modified asphalts have been used to prepare asphalt paving mixtures required to conduct wheel track tests. The predicted model of asphalt mixtures rut depth related to asphalt rutting parameter (G﹡/sin δ) values has been founded. Besides, the minimum limits of (G﹡/sin δ) of aged asphalt have been gotten as 3.25 kPa for Iraqi asphalt cement.

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