IHE Branch Event
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Online: The Impact of Climate Change on Hot Rolled Asphalt (HRA) Surfacing
- CPD Value: This event is awarded 1 CPD Hour
|Dates||Location||Cost (ex VAT)|
|Wed 09 Nov 2022||Online via Teams||FREE|
REGISTRATION NOW CLOSED
UK – 15:00hrs – 16:00hrs
Doha -18:00hrs – 19:00hrs
The IHE Middle East Branch would like to invite you to their next technical webinar on Wednesday 9th November 2022.
The road pavement network is a crucial part of the transportation sector in the UK, and with the ongoing climate change, it is important to analyse how climate change will impact pavements over the next 50 years.With climate change resulting in higher pavement temperatures in the future, surface courses will be put under increased stresses and strains. To minimize failed pavements and consider long-term material choices, it is necessary to evaluate the impact of pavement temperature on behaviour, especially cracking and deformation.
In this paper, a modified Wheel Tracking Test (WTT) was used to investigate the influence of pavement temperature (based on climate change predictions) on the performance of Hot Rolled Asphalt (HRA) surface courses. The modified Wheel Tracking Test facilitates a small-scale investigation of a pavement layer, consisting of beam samples overlaying a foundation of rubber granules and crushed rock aggregate, with Cement Bound Granular Material (CBGM) blocks acting as supports. Samples were exposed to 10,800 load passes (3 hours test time) from a wheel exerting a load of 1.5 kN; the total load applied was equivalent to 200 standard axles of 80 kN. In addition, the use of temperature data logging and a camera to produce time-lapse videos furthered the data collected. At the end of testing, 36 samples had been tested at either 24°C or 37°C, representing a mixture of HRA surface courses (55/10F and 35/14F designs), some standard designs and some non-standard (additional thickness or binder content). The tests showed that the number of load passes until failure (defined as a full depth crack) was lower when the testing temperature was higher. In addition, the non-standard designs which were either thicker or had higher binder contents, did not show improved performance, and thus further research is required to understand how the impact of climate change can be mitigated. Another finding was the relationship between the crack width/sample depth ratio and occurrence of a full depth crack (i.e. test failure), which suggested that the monitoring of crack width can help to predict failure. Finally, recommendations for further research were made, especially to investigate the impact of climate change on other pavement surface course materials such as Asphalt Concrete (AC), Stone Mastic Asphalt (SMA), Porous Asphalt (PA) and Thin Surface Course Systems (TSCS), and the use of Polymer Modified Bitumen (PMB) within the surface course mixtures to reduce the impact of climate change.
Mr. Kieran is working as a Pavement Engineer at AECOM Nottingham Office UK with experience of working on a range of highway and airfield projects for clients such as National Highways and the Defence Infrastructure Organization. His key interest within the field is how our fully flexible roads and runways will be impacted by ongoing climate change, and how these networks can be built to be more resilient.
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