자료유형  

 학위논문

Control Number  

0016935177

International Standard Book Number  

9798380714228

Dewey Decimal Classification Number  

625

Main Entry-Personal Name  

Mocelin, Douglas Martins.

Publication, Distribution, etc. (Imprint  

[S.l.] : North Carolina State University., 2023

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2023

Physical Description  

1 online resource(284 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-05, Section: A.

General Note  

Advisor: Castorena, Cassandra;Kim, Youngsoo.

Dissertation Note  

Thesis (Ph.D.)--North Carolina State University, 2023.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약Recycled asphalt materials (RAM), such as recycled asphalt pavements (RAP) and recycled asphalt shingles (RAS) are incorporated in the production of new asphalt mixtures to reduce cost, waste, and the consumption of virgin materials. The amount of recycled asphalt materials (RAM) that can be used in a new asphalt mixture is limited by controlling agencies due to the uncertainties in how to properly account for partial recycled binder availability (RBA) within asphalt mixture design procedures, and its impacts on the volumetric composition and long-term performance. RBA, which reflects the proportion of the RAM recycled binder that is available to blend with virgin asphalt in an asphalt mixture, is currently neglected by the majority of mixture design methods adopted by highway agencies, despite complete RBA being considered an unrealistic scenario, due to the lack of an accepted method to quantify RBA and to include RBA in mixture design procedures. This dissertation contributes to the understanding of the consequences of RBA on the characteristics of RAP and RAS, and on the role these materials play in asphalt mixtures composition, design, and performance.The work documented in this dissertation starts with research efforts to evaluate the relationship between performance and volumetric properties of RAP containing mixtures, in the context of the balance mix design plus (BMD+) framework, which shows that the linear relationship proposed is valid even neglecting RBA. However, by investigating the role of the RAP and RAS RBA on the mixtures asphalt mixtures composition, it is found that the unavailable recycled binders affect the calculated volumetric properties, notably leading to a lower effective binder content, and therefore, lower voids in mineral aggregate (VMA) and lower voids filled with asphalt (VFA) than what may be calculated. Consequently, the mixtures designed under current procedures may have insufficient virgin asphalt and lack durability. Another important consequence of RBA is on the aggregates structure, which is affected by the presence of RAP and RAS agglomerations that persist on the mixture after production and compaction. To address the consequences of RAP and RAS RBA, a rational method that accounts for the consequences within mixture design is developed, named availability adjusted mixture design (AAMD) method. A formal framework is proposed to either design new mixtures, or to adjust mixtures that were originally designed under the assumption of complete availability. Amendments to the current Superpave volumetric properties equations are proposed to include the effects of RAP and RAS RBA. Several mixture designs were prepared under the proposed AAMD framework to evaluate the method and to understand its consequences on the mixture's performance. The cracking and rutting performance of AAMD designed mixtures were systematically tested and compared to that of the Superpave designed mixtures and to corrected optimum asphalt content (COAC) designed mixtures. It is demonstrated that the AAMD mixtures can significantly improve the mixtures cracking performance by addressing the RAM effective binder content, while maintaining the rutting performance by addressing the role of the RAM agglomerations on the design of the aggregate gradation structure. The AAMD method was also shown effective to mitigate the adverse effects of RAP by comparing its performance to virgin mixtures designed with similar available volumetric properties, and to allow the increase of RAP content in the mixtures without compromising its performance by maintaining the available volumetric properties similar. Finally, two different approaches to integrate the AAMD method into the BMD+ framework to are demonstrated. The findings of the series of research efforts presented in this dissertation are envisioned to be used to promote a more rational use of RAM in asphalt mixtures and explore the maximum benefits these materials can provide.

Subject Added Entry-Topical Term  

Asphalt pavements.

Subject Added Entry-Topical Term  

Oxidation.

Subject Added Entry-Topical Term  

Performance evaluation.

Subject Added Entry-Topical Term  

Adjustment.

Subject Added Entry-Topical Term  

Design techniques.

Subject Added Entry-Topical Term  

Microscopy.

Subject Added Entry-Topical Term  

Aggregates.

Subject Added Entry-Topical Term  

Design.

Added Entry-Corporate Name  

North Carolina State University.

Host Item Entry  

Dissertations Abstracts International. 85-05A.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:642881