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Title: Sustainable use of Foamix in Ireland
Author: O'Prey, Declan
ISNI:       0000 0001 3453 9969
Awarding Body: University of Ulster
Current Institution: Ulster University
Date of Award: 2007
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This thesis has considered the issue of sustainable highway engineering in Ireland. The research was funded by a Collaborative Award in Science and Technology (CAST), with Lagan Holdings being the industrial collaborator. CAST requires product related research. An extensive review of academic and trade literature identified that the further development of cold mix asphalts should be the product to be investigated. The specific cold mix investigated was wet mix macadam stabilised using foamed bitumen Le. Foamix. This material had been used by the collaborating industrialist for nearly 8 years. However, its development was restricted by a traditional industry reluctant to change and a lack of specific cold mix specification. The industrial collaborator wanted to increase its use throughout Ireland and saw the CAST Award as an ideal opportunity to investigate and promote this material. Sustainability is a key issue in the development of new products. Many governments and industries throughout the world have developed strategies to achieve sustainable development. This thesis examines the issue in the context of highway construction throughout Ireland. The study was built on the hypothesis that Foamix manufacture and use in Ireland urgency requires improved specification and test procedures, increased knowledge of its performance and consideration of environmental issues. A methodology was developed to design and assess Foamix materials in the laboratory. This has proposed a new Foamix specification making recommendations of aggregate grading, binder content and type, cement content and an assessment methodology based on accelerated curing and strength assessment using Indirect Tensile Strength. The laboratory performance of Foamix was compared with traditional hot mix dense bituminous macadam. Many of the test methods used to assess hot mix asphalts were found not suitable for Foamix.The environmental impact of Foamix and Dense Bitumen Macadam (DBM) was compared in terms of energy use, carbon dioxide (C02) emissions and resource use. Different case studies were evaluated to reflect how these materials would compare. This found that Foamix is better in terms of reducing energy use, C02 emissions and the resource use. It was found that the addition of recycled materials has less detrimental affect when added to Foamix compared to the hot DBM. Although the sustainability of Foamix use in Ireland compared to DBM is difficult to assess without a better understanding of their long-term performance, the research has resulted in an improved understanding of both Foamix and DBM and demonstrated to the industrial partner how these products can be improved.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available