Life Cycle Assessement of Reclaimed Asphalt Compared to Hot Mix Asphalt

Table of Contents

1.0 INTRODUCTION

1.1 Background

1.2 Problem Statement

1.3 Aim & Objectives

1.4 Report Structure

2.0 ROAD DESIGNS AND CONSTRUCTION PRACTICE IN MAURITIUS

2.1 Road Construction in Mauritius

2.2 Road Responsibilities

2.3 Maintenance

2.4 Pavement types

2.4.1 Flexible pavements

2.4.2 Rigid pavements

2.4.3 Composite pavements

2.5 Hot Mix Asphalt (HMA)

2.5.1 Asphalt production

2.5.2 Asphalt Binder

2.5.3 Properties of Asphalt binder

2.6 Pavement Sustainability

2.7 Reclaimed Asphalt Pavement (RAP)

2.7.1 Overview

2.7.2 Removal process

2.7.3 Practice in Mauritius

2.7.4 Uses of RAP

2.7.5 Advantages and Disadvantages of RAP

2.8 Types of sustainable materials

2.8.1 Glass Waste

2.8.2 Rubber

2.8.3 Fly Ash

2.8.4 Polymer

2.8.5 Recycled Concrete Pavement(RCP)

2.9 Equipment used for asphalting

2.9.1 Lorry

2.9.2 Pavers

2.9.3 Roller

2.9.4 Miller

3.0 LIFE CYCLE ASSESSMENT(LCA)

3.1 Life Cycle Assessment

3.2 LCA Approaches

3.2.1 Process LCA

3.2.2 Input-Output LCA

3.2.3 Hybrid LCA

3.3 Limitation of LCA

4.0 PAVEMENT LCA LITERATURE REVIEW

4.1 Pavement Life Cycle

4.2 Pavement LCA models

4.3 Cost Estimate

4.4 Conclusion

5.0 MATERIAL AND METHODS

5.1 Goal and Scope Definition

5.1.1 Goal Definition

5.1.2 Scope definition

5.1.3 System studied

5.2 Function and Functional unit

5.3 System boundary

5.4 Types, quality and sources of required data

5.5 Data categories

5.6 Data quality

5.7 Critical review

5.8 Life Cycle Inventory

5.9 Life Cycle Impact Assessment (LCIA)

5.10 Life Cycle Interpretation

5.11 Economic Analysis

6.0 RESULT AND DISCUSSION

6.1 Life Cycle Inventory Results

6.2 Life Cycle Impact Assessment Results

6.2.1 ReCiPe Midpoint

6.2.2 ReCiPe Endpoint

6.3 Damage Assessment

6.3.1 Design 2

6.3.2 Design 1

6.4 Comparative Study of the models

6.4.1 Impact assessment

6.4.2 Damage Assessment

6.5 Life Cycle Interpretation

6.5.1 Energy

6.5.2 Global Warming Potential (GWP)

6.5.3 Damage Assessment

6.5.4 ReCiPe

6.5.5 Limitation

6.6 Comparative cost analysis

6.6.1 Cost model

6.6.2 Data collection

6.6.3 Assumption

6.6.4 Cost Calculation

6.6.5 Discussion

7.0 CONCLUSIONS AND RECOMMENDATIONS

7.1 Findings

7.2 Conclusions

7.3 Recommendations

7.3.1 Further LCA research

7.3.2 The Construction industry in Mauritius

Research Objectives and Focus Themes

This work evaluates the environmental and economic feasibility of using Reclaimed Asphalt Pavement (RAP) as a substitute for conventional Hot Mix Asphalt (HMA) in road construction in Mauritius, specifically aiming to reduce environmental degradation and reliance on virgin materials through a Life Cycle Assessment (LCA) and economic cost analysis.

• Life Cycle Assessment (LCA) of pavement construction methods.
• Implementation of Reclaimed Asphalt Pavement (RAP) in the local context.
• Comparative environmental impact analysis using the ReCiPe methodology.
• Economic evaluation and cost-benefit analysis of sustainable versus conventional pavement models.
• Identification of environmental hotspots in road maintenance and construction.

Excerpt from the Book

Summary of Chapters

1.0 INTRODUCTION: This chapter introduces the project context, setting the stage by defining the research problem regarding traffic growth and road sustainability, and outlines the core aims and objectives of the study.

2.0 ROAD DESIGNS AND CONSTRUCTION PRACTICE IN MAURITIUS: This section details existing road infrastructure, pavement types, standard construction practices in Mauritius, and provides a theoretical foundation regarding the materials and equipment involved in asphalting.

3.0 LIFE CYCLE ASSESSMENT(LCA): This segment explains the scientific methodology of Life Cycle Assessment, evaluating different approaches (Process, Input-Output, Hybrid) and clarifying the framework used to assess the environmental impact of infrastructure materials.

4.0 PAVEMENT LCA LITERATURE REVIEW: This chapter synthesizes previous studies and global research on pavement sustainability, examining how different authors have approached the LCA of recycled materials in road construction.

5.0 MATERIAL AND METHODS: This chapter defines the parameters of the study, describing the comparative models (Design 1 vs. Design 2), defining the system boundaries, and outlining the data collection processes utilized for the analysis.

6.0 RESULT AND DISCUSSION: This chapter presents the processed inventory results and impact assessments derived from the SimaPro software, contrasting the performance of conventional HMA with RAP-incorporated designs through environmental and economic KPIs.

7.0 CONCLUSIONS AND RECOMMENDATIONS: This final chapter synthesizes the research findings, confirms the environmental and financial advantages of using RAP, and provides strategic recommendations for local authorities in Mauritius to adopt more sustainable road construction guidelines.

Keywords

Life Cycle Assessment, Reclaimed Asphalt Pavement, Hot Mix Asphalt, SimaPro, ReCiPe, Pavement Sustainability, Carbon Dioxide, Global Warming Potential, Bitumen, Road Maintenance, Environmental Impact, Construction Costs, Mauritius, Infrastructure, Sustainable Materials

Frequently Asked Questions

What is the primary scope of this dissertation?

This report focuses on conducting a comparative Life Cycle Assessment and economic evaluation of conventional Hot Mix Asphalt (HMA) versus HMA incorporating 10% Reclaimed Asphalt Pavement (RAP) within the Mauritian road construction sector.

What are the central themes of the research?

The research explores the balance between environmental and economic impacts, the viability of recycling waste construction materials, and the assessment of carbon footprint and energy consumption in road infrastructure.

What is the core objective of the work?

The main goal is to determine if substituting virgin materials with RAP in pavement construction can effectively reduce the environmental burden and total project costs for the local transportation authority.

Which scientific methodology is applied?

The study utilizes the ISO-compliant Life Cycle Assessment (LCA) framework, processed via SimaPro software, and adopts the ReCiPe indicator method to categorize midpoint and endpoint environmental impacts.

What does the main body of the work cover?

The body spans literature reviews of global pavement LCA studies, detailed description of Mauritian road construction standards, LCI data collation, impact assessment results (ReCiPe Midpoint/Endpoint), and a comprehensive comparative cost analysis.

Which keywords best characterize this research?

Key terms include Life Cycle Assessment, Reclaimed Asphalt Pavement (RAP), Hot Mix Asphalt (HMA), Environmental Impact, Mauritius, Pavement Sustainability, and Economic Evaluation.

How does the incorporation of RAP affect the carbon footprint?

The study suggests that utilizing 10% RAP decreases carbon dioxide emissions by approximately 6% due to reduced reliance on raw virgin materials and bitumen production, which is a major environmental hotspot.

What are the practical findings regarding cost?

The economic evaluation demonstrates that incorporating 10% RAP into HMA mixes can lead to an overall cost reduction of up to 9% compared to traditional HMA pavements.