An improved interface temperature distribution in shallow hot mix asphalt patch repair using dynamic heating

ABSTRACT

This study focuses on the issue of hot mix asphalt patch repairs, the performance of which is greatly reduced by repair edge disintegration. This is caused by low interface temperatures which result in poor repair bonding between fill material and host pavement. Twenty-four pothole repairs, 45 mm in depth, comprising 12 static and 12 dynamic repairs heated for 10 min 15 s and 21 min 49 s, respectively have been investigated. Dynamic heating has been completed using an experimental infrared heater. Temperatures were measured at 11 locations on the repair interfaces during the pouring and compaction of the fill mix. Volumetric of asphalt mixtures were also investigated. The results demonstrated that for static repairs, the lowest maximum temperatures were located at corners and on vertical repair boundaries. It was found that high thermal contact resistance in these interfaces dramatically affect the temperature levels. However, the figures improved in dynamically heated repairs. Comparing dynamically heated repairs of 10 min 15 s and 21 min 49 s with static repairs, showed average corner temperatures increase 10.85–24.45°C and 29.51–36.73°C, respectively, with accompanying increases in vertical interface temperatures 34.97°C and 46.41°C, respectively.

KEYWORDS:

• Dynamic pothole repair
• infrared heat
• asphalt pavement distress
• static pothole repair
• cold repair boundary
• interface disintegration

Acknowledgement

Nynas UK AB and Conexpo (NI) Ltd supported by providing materials. Thermtest company supported in thermal conductivity instrument testing. Laboratory work was supported by Brunel University technical staff Neil Macfadyen and Simon Le Geyt and undergraduate students Albert Phillipson and Kamal Ahmad.

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Juliana Byzyka http://orcid.org/0000-0002-5570-8909

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

This work was financially supported by International Chem-Crete Corporation, Texas, USA, Brunel University London , Epicuro Ltd and DAC Consulting (UK) Ltd.