Pyrolysis of Reclaimed Asphalt Aggregates in Mortar

Journal article (2022)

Authors

Bagus Hario Setiadji Universitas Diponegoro
M. Agung Wibowo Universitas Diponegoro
H.M. Jonkers Materials and Environment - CEG
M. Ottele Materials and Environment - CEG
Widayat Widayat Universitas Diponegoro
Mochammad Qomaruddin Universitas Nahdlatul Ulama Surabaya, Universitas Diponegoro
Felix Hariyanto Sugianto Universitas Diponegoro
Widodo W. Purwanto Universitas Diponegoro
Han Ay Lie Universitas Diponegoro
Research Group
Materials and Environment (CEG) (TU Delft)
Copyright: © 2022 Bagus Hario Setiadji, M. Agung Wibowo, H.M. Jonkers, M. Ottele, Widayat, Mochammad Qomaruddin, Felix Hariyanto Sugianto, Purwanto, Han Ay Lie
DOI
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https://doi.org/10.14716/ijtech.v13i4.5621
Mechanical properties Mortar constituent Pyrolysis recycled asphalt aggregates
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Published Date

2022

Language

English

Reuse Rights

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Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

Abstract

Asphalt pavement consists of aggregates resulting in a waste material at end of its life. The aggregates can be reused as basic material for asphalt or cementitious binding agents. In both scenarios, the recycled aggregates should provide a good bond with the binder to achieve strength. This study focuses on reusing recycled asphalt aggregates (RAA) in mortar. The major weakness of RAA is the thin oily film originating from the asphalt residue, weakening the bond with cement. The pyrolysis method is accessed in an attempt to overcome this weakness. Three scenarios were investigated; the use of virgin aggregates (VA), RAA, and pyrolysis recycled asphalt aggregate (PRAA) as constituent in mortar. All variables were set a constant except for the aggregate type, the VA mortar function as controlling element. This research is methodologically based on experimental data conducted in the laboratory, while aggregate samples were taken from the field. To analyze the influence of pyrolysis to the aggregate-to-cement bond behaviour, qualitative and quantitative data were collected. The quantitative data were the mechanical properties, the mortar tensile, and compression strength. The qualitative data were obtained from scanning electron microscope readings to visually observe the aggregate surface roughness and voids, including the aggregates cross-section and pre-existing micro-cracks in the aggregate-to-cement interface. Supporting data were the aggregates‘ abrasion rate and absorption. The RAA resulted in a significant mortar strength decrease. This conclusion was supported by the findings of pre-existing cracks in the interfacial transition zone. The pyrolysis method improved the compression strength but negligibly affected the tensile behavior. The compression and tensile strength increased as a function of time for both RAA and PRAA, and a strength convergence was reached at 28 days. The PRAA is considered an option for reuse in mortar, supporting nature conservation.