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Chemical and Microstructural Changes in Reclaimed Asphalt Pavement Aggregates by Pyrolysis

  • Research Article-Civil Engineering
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Abstract

The utilization of reclaimed asphalt pavement (RAP) aggregates as an alternative for rigid pavements is limited. The main objective of this study is to explore and improve the utilization of RAP aggregates as an alternative material for rigid pavement. Specifically, this study focuses on addressing a significant challenge associated with RAP aggregates, which is their poor bond with cementitious binders. The poor bonding results in low compressive and tensile strengths of concrete or mortar. The poor bonding is mainly due to the presence of a thin oily layer of asphalt residue. A proposed method was carried out to reduce the negative impact on the bond between the aggregate and mortar by exposing the RAP aggregates to the pyrolysis process. The research focused on the analyses of the physical and chemical behavior of the aggregates, using the SEM, EDX, and FTIR approaches, as well as reviewing the mortar in both compressive and flexural tensile strength. The pyrolysis affected the physical and mechanical properties positively and the chemical composition of the RAP showed significant changes. The chemical constituents of asphalt attached to RAP aggregates are hydrocarbons. The thin layer of RAP asphalt is the cause of weak bonding, but this layer was altered by the pyrolysis procedure. As a result, water absorption decreased, which had a positive impact on the hydraulic synergy of cement. It is shown that the pyrolyzing RAP improves the compressive strength and flexural tensile strength through modification of the asphalt residue covering the aggregates.

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Data Availability

Data sets generated during the current study are available from the corresponding author upon reasonable request.

Abbreviations

\(f_{{\text{c}}}^{{\prime }}\) :

Compressive strength of mortar (MPa)

f t :

Flexural strength of mortar (MPa)

P :

Load (N)

A :

Cross-sectional area (mm2)

M :

Bending moment (Nmm)

y :

Half height of beam (mm)

Ix :

Beam inertia (mm4)

RAP:

Reclaimed asphalt pavement

PYRO:

Pyrolysis aggregate

FTIR:

Fourier transform infra-red

EDX:

Energy-dispersive X-ray

SEM:

Scanning electron microscope

ASTM:

American standard testing material

SNI:

Standard Nasional Indonesia

MPa:

Mega pascal

C:

Carbon

Ca:

Calcium

C–H:

Hydrocarbon

O–H:

Hydroxide

C–S:

Carbon sulfide

C–O:

Carbon monoxide

S:

Sulfur

S–S:

Disulfide

Si:

Silica

Fe:

Ferrit

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Acknowledgements

This paper was funded by a Domestic Postgraduate Education Scholarship (BPPDN) with Letter Number: B/67/D.D3/KD.02.00/2019 from the Ministry of Education, Culture, Research, Technology, Republic of Indonesia.

Funding

This paper was funded by scholarship from Ministry of Education, Culture, Research, Technology, Republic of Indonesia, which the authors gratefully acknowledge.

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Authors and Affiliations

  1. Department of Civil Engineering, Universitas Diponegoro, Semarang, Indonesia

    Mochammad Qomaruddin, Han Ay Lie &  Purwanto

  2. Material and Construction Laboratory, Universitas Diponegoro, Semarang, Indonesia

    Han Ay Lie

  3. Department of Chemical Engineering, Universitas Diponegoro, Semarang, Indonesia

    Widayat

  4. Department of Civil Engineering, Universitas Islamic Nahdlatul Ulama, Jepara, Indonesia

    Mochammad Qomaruddin

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  1. Mochammad Qomaruddin
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Contributions

MQ proposing ideas, formal analysis, and writing–review and editing and original draft. HAL contributed to conceptualization, writing, supervising methods, and manuscript checking. Purwanto helped in resources, investigation, and visualization. Widayat contributed to conceptualization, methodology, validation, and manuscript checking. All authors read and approved the final manuscript.

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Correspondence to Mochammad Qomaruddin.

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Qomaruddin, M., Lie, H.A., Purwanto et al. Chemical and Microstructural Changes in Reclaimed Asphalt Pavement Aggregates by Pyrolysis. Arab J Sci Eng (2024). https://doi.org/10.1007/s13369-023-08698-5

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