Evaluation of impact of fiber type and dosage rate on volumetrics and laboratory performance of asphalt mixtures

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Evaluation of impact of fiber type and dosage rate on volumetric and laboratory performance of asphalt mixtures, Is A Well-Researched Topic, It Is To Be Used As A Guide Or Framework For Your Research.

ABSTRACT

The purpose of this study is to evaluate the impact of fiber types, binder content, and dosage rates on the volumetric properties and laboratory performance of asphalt mixtures. One asphalt mixture (control) and four fiber types (Fiberglass, Basalt, Carbon, and Polyolefin/Aramid) were used to evaluate the impact of fiber types and dosage rates. Two mixing procedures for introducing fibers into asphalt mixtures were also evaluated: dry and proportional dispersion methods. To evaluate the impact of fiber types, 0.16% by total mix weight was used. Rutting, cracking, and durability performance tests were evaluated. Furthermore, using 0.15% and 0.3% fiber dosage rates, a novel experimental methodology was developed and implemented consisting of a volumetric mixture design and performance testing—(IDEAL-CT) and (APA)—to isolate the effects of fiber types and dosage rates from the effect of binder content. Results showed that 0.16% and 0.15% dosage rate had little to no impact on optimum binder content; whereas 0.3% dosage rate required an increase in binder content to meet volumetric requirements. Performance testing showed that 0.16% and 0.15% (regardless of fiber type) had little to no impact on cracking and rutting performance. All fiber types at 0.16% fiber dosage improved mixtures’ durability. Using 0.3% dosage rate, only carbon fiber improved cracking performance without the use of additional binder.

Table of Contents

Abstract ………………………………………………………………………………………………………………. v
List of Figures …………………………………………………………………………………………………….. ix
List of Tables ……………………………………………………………………………………………………… xi
Chapter 1: Introduction …………………………………………………………………………………………. 1
Background ……………………………………………………………………………………………………. 1
Problem Statement ………………………………………………………………………………………….. 2
Research Hypothesis ……………………………………………………………………………………….. 3
Significance of Study ………………………………………………………………………………………. 3
Goal & Objectives ………………………………………………………………………………………….. 4
Research Approach …………………………………………………………………………………………. 5
Chapter 2: Literature Review …………………………………………………………………………………. 7
Introduction ……………………………………………………………………………………………………. 7
General Asphalt Mix Design Procedure …………………………………………………………….. 8
Laboratory Mixing Procedures for Fiber-Reinforced Asphalt Mixtures ……………….. 10
Dry Mixing Method. ………………………………………………………………………………… 11
Wet Mixing Method. ………………………………………………………………………………… 14
Other Mixing Methods. …………………………………………………………………………….. 16
Impact of Fibers on Asphalt Mixtures’ Mix Design …………………………………………… 18
Mix Design Requirements. ……………………………………………………………………….. 18
Clumping………………………………………………………………………………………………… 20
Laboratory Performance Testing on Fiber-Reinforced Asphalt Mixtures ……………… 23

Field Performance of Fiber-Reinforced Asphalt Mixtures ………………………………….. 31
Summary of Literature Review ……………………………………………………………………….. 34
Chapter 3: Description of Fiber-Reinforced Asphalt Materials Used ………………………… 35
P-401 Asphalt Mixtures’ Characteristics and Gradation …………………………………….. 35
Fibers ………………………………………………………………………………………………………….. 37
Chapter 4: Impact of Fiber Types …………………………………………………………………………. 40
Sample Preparation ……………………………………………………………………………………….. 40
Laboratory Experimental Plan ………………………………………………………………………… 43
Dynamic Complex Modulus (|E*|). ……………………………………………………………. 45
Flow Number (FN) or Repeated Load Permanent Deformation. ……………………. 45
Asphalt Pavement Analyzer (APA). …………………………………………………………… 46
Indirect Tensile Strength Cracking Index (IDEAL-CT). ……………………………….. 46
Cantabro Durability Test…………………………………………………………………………… 47
Impact of Mixing Methods and Fiber Types on Asphalt Mixtures’ Volumetrics …… 48
Laboratory Performance Results …………………………………………………………………….. 51
Mix Characteristics and Durability. ……………………………………………………………. 51
Rutting Susceptibility Performance. …………………………………………………………… 53
Strength and Cracking Resistance. …………………………………………………………….. 54
Statistical Analysis Using Analysis of Variance (ANOVA) and Tukey Post-Hoc. ………………………………………………………………………………………………… 55
Chapter 5: Impact of Fiber Dosage Rates ………………………………………………………………. 58
Material and Experimental Plan Used to Evaluate the Impact of Fiber Dosages. …… 58

Mixing Procedure and Experimental Plan ………………………………………………………… 62
Superpave Mix Design Results ……………………………………………………………………….. 64
Reflecting Height ………………………………………………………………………………………….. 66
Selection of Compaction Effort ………………………………………………………………………. 68
Laboratory Performance Results and Discussion. ……………………………………………… 71
Impact of Fiber Type and Dosage Rate on Asphalt Cracking Performance. …….. 71
Impact of Fiber Type and Dosage Rate on Asphalt Rutting Performance ……….. 75
Statistical Analysis. ………………………………………………………………………………….. 78
Chapter 6: Summary of Findings, Conclusions, Recommendations & Future Work ……. 82
Summary of Findings …………………………………………………………………………………….. 82
Conclusions and Recommendations ………………………………………………………………… 84
Future Work …………………………………………………………………………………………………. 85
References …………………………………………………………………………………………………………. 87

Additional information

Author

Ahmad G. M. Alfalah

No of Chapters

6

No of Pages

104

Reference

YES

Format

PDF

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