Laboratory evaluation of the impact of additives on asphalt binders used in cold regions

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Laboratory evaluation of the impact of additives on asphalt binders used in cold regions, Is A Well-Researched Topic, It Is To Be Used As A Guide Or Framework For Your Research.

ABSTRACT

The objective of this research study is to evaluate the effect of additives (polymers, nanomaterials, and softening agents) on rutting, cracking, and fatigue performance of asphalt binders commonly used in cold regions (PG 52-34 and PG 64E-40). In this study, the first phase consisted of using polymers (Styrene-Butadiene-Styrene, Ground-Tire-Rubber) and nanomaterials (TiO2 and SiO2) to modify two asphalt binders used in cold regions (PG52-34 and PG64E-40). The second phase of the study consisted of adding a combination of softening agents (Corn oil or Sylvaroad) with polymers (SBR, Epoxy, and SBS) to PG52-34 asphalt binder. The performance evaluation was conducted using the Brookfield Viscometer (RV), Dynamic Shear Rheometer (DSR), standard Bending Beam Rheometer (BBR), BBR strength, and Linear Amplitude Sweep (LAS). The testing results showed that the polymers could improve the rutting , cracking and fatigue performance of asphalt binders. GTR improved high and low temperature performance grades, fatigue properties, and strain at failure. Nano-TiO2 and SiO2 did not show a considerable performance improvement compared to SBS and rubber in low temperature and fatigue properties. Results also showed that 7.5% SBS combined with corn oil is considered the best candidate asphalt binder modification to improve the resistance to rutting, fatigue, and thermal cracking.

Table of Contents

Abstract……………………………………………………………………………………….v
List of Figures……………………………………………………………………………xi
List of Tables……………………………………………………………………………xiii
Chapter 1: Introduction………….…….…………………………………………………..1
Background ……………………………………………………………………………………………………… 1
Problem Statement ……………………………………………………………………………………………. 3
Research Hypothesis …………………………………………………………………………………………. 3
Goal & Objectives ……………………………………………………………………………………………. 4
Phase 1: Polymers and Nanomaterials Modified Asphalt Binders ……………………….. 4
Phase 2: Polymers and Softening Agents Modified Asphalt Binders: ………………….. 5
Research Approach …………………………………………………………………………………………… 5
Task 1: Conduct a Comprehensive Literature Review. ………………………………………. 6
Phase 1: Polymers and Nanomaterials Modified Asphalt Binders. ………………………. 6
Task 1: Select, Modify, and Prepare Materials to be Tested. ………………………………. 6
Task 2: Conduct Performance Testing. …………………………………………………………….. 7
Task 3: Discussion and Analysis of the Performance Testing Results ………………….. 8
Task 4: Summary, Conclusion, and Recommendations …………………………………….. 8
Phase 2: Polymers and Softening Agents Modified Asphalt Binders: ………………….. 8
Task 1: Select, Modify, and Prepare Materials to be Tested. ………………………………. 8

Task 2: Conduct Performance Testing ……………………………………………………………… 9
Task 3: Discussion and Analysis of the Performance Testing Results ………………….. 9
Task 4: Summary, Conclusion, and Recommendations …………………………………… 10
Significance of Study…………………………………..……………………………….10
Chapter 2: Literature Review…………..…………………………………………………11
Introduction ……………………………………………………………………………………………………. 11
History of Asphalt Binder Specifications …………………………………………………………… 12
Asphalt Binder Polymer Modification ……………………………………………………………….. 15
Styrene Butadiene Styrene (SBS). …………………………………………………………………. 16
Nanomaterials. ……………………………………………………………………………………………. 18
Styrene Butadiene Rubber (SBR). …………………………………………………………………. 20
Rubber ……………………………………………………………………………………………………….. 21
Epoxy ………………………………………………………………………………………………………… 24
Biomodified Asphalt Binders ……………………………………………………………………….. 25
Laboratory Performance of Modified Asphalt Binders ………………………………………… 26
Rotational Viscometer . ……………………………………………………………………………….. 26
Bending Beam Rheometer. …………………………………………………………………………… 28
Dynamic Shear Rheometer . …………………………………………………………………………. 30
Frequency Sweep Testing for Rheological Characterization. …………………………….. 31
Multiple Stress Creep and Recovery Test. ………………………………………………………. 34
Fatigue Cracking Laboratory Performance Testing. …………………………………………. 35

Summary of the Literature Review. ……………………………………………………………….. 38
Chapter 3: Materials and Experimental Methods………………………………………..39
Overview of the Laboratory Experimental Program ……………………………………………. 39
Materials and Modification Methodology ………………………………………………………….. 39
Binder Aging Procedures …………………………………………………………………………………. 43
Rolling Thin Film Oven aging procedure or Short- Term Aging. ………………………. 44
Pressurized Aging Vessel (PAV). ………………………………………………………………….. 44
Experimental Plan …………………………………………………………………………………………… 45
Standard Method of Test for Viscosity Determination of Asphalt Binder Using Rotational Viscometer (AASHTO T316-13 (2017)). ……………………………………….. 46
Frequency Sweep. ……………………………………………………………………………………….. 47
Standard Test Method for determining the rheological Properties of Asphalt Binder Using a Dynamic Shear Rheometer (DSR) (AASHTO T315-12). ……………………… 48
Bending Beam Rheometer (BBR) (AASHTO T313-12). ………………………………….. 48
Modified BBR Test for Low Temperature Properties. ……………………………………… 49
Multiple Stress Creep Recovery (MSCR) (AASHTO T350-14). ……………………….. 50
Modified Linear Amplitude Sweep . ……………………………………………………………… 51
Chapter 4: Results and Discussion……………………………………………………….52
Polymer and Nanomaterials Modified PG52-34 and PG64E-40 Asphalt Binders ……. 52
Viscosity. …………………………………………………………………………………………………… 52
Dynamic Complex Modulus and Phase Angle. ……………………………………………….. 55

Black Space Diagrams …………………………………………………………………………………. 59
Continuous Performance Grade. ……………………………………………………………………. 61
Creep Siffness at Low Temperature ………………………………………………………………. 63
Stress and Strain at Failure at -30° C of Polymer and Nanomaterials Modified Asphalt Binders …………………………………………………………………………………………… 65
Rutting Performance ……………………………………………………………………………………. 73
Non–Recoverable Creep Compliance (Jnr3.2) ………………………………………………… 74
Average Percent Recovery ……………………………………………………………………………. 79
Fatigue Life. ……………………………………………………………………………………………….. 85
Summary of Findings for Polymer and Nanomaterials Modified Asphalt Binders ….. 89
Softening Agents and Polymer Modified PG52-34 Asphalt Binder ……………………….. 91
Dynamic Complex Modulus and Phase Angle ………………………………………………… 91
Continuous Performance Grade. ……………………………………………………………………. 94
Creep Stiffness ……………………………………………………………………………………………. 95
Rutting Performance. Non–Recoverable Creep Compliance (Jnr3.2) …………………. 99
Average Percent Recovery. …………………………………………………………………………. 102
Summary of Findings for Polymer and Softening Agents Modified Soft Asphalt Binders …………………………………………………………………………………………………….. 105
Chapter 5: Conclusions and Recommendations ……………………………………………………..107
Conclusions for Polymers and Nanomaterial Modified Asphalt Binders ……………….107
Recommendations for Polymers and Nanomaterial Modified Asphalt Binders ……… 108
Conclusions for Polymers and Softening Agents Modified Asphalt Binders ………… 109

Recommendations for Polymers and Softening Agents Modified Asphalt Binders .. 110
References………………………………………………………………………………111

Additional information

Author

Neirouz Bouhrira

No of Chapters

5

No of Pages

137

Reference

YES

Format

PDF

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