DurabRoads - life cycle costing analysis - Revision history

Designing Buildings at 07:35, 19 January 2021

2021-01-19T07:35:50Z

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	* Types of road and street.		* Types of road and street.

−	[[Category:~~Research_/_Innovation~~]] [[Category:DCN_Research,_Development_and_Innovation]] [[Category:Construction_techniques]]	+	[[Category:DCN_Commentary]] [[Category:DCN_Project_Knowledge]] [[Category:DCN_Research,_Development_and_Innovation]] [[Category:Research_/_Innovation]] [[Category:Construction_techniques]]

Designing Buildings at 16:25, 15 February 2018

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	The LCA study was first used to gauge the environmental impact of 1kg of the bitumen mix alone for the AC, BBTM, PA and DurabRoads Bitumen mixtures. Then the environmental impact assessment of the material for each of the road systems was carried out for a unit area of 7.4 m x 1,000 m, looking at the environmental impacts for a 50-year lifecycle.		The LCA study was first used to gauge the environmental impact of 1kg of the bitumen mix alone for the AC, BBTM, PA and DurabRoads Bitumen mixtures. Then the environmental impact assessment of the material for each of the road systems was carried out for a unit area of 7.4 m x 1,000 m, looking at the environmental impacts for a 50-year lifecycle.
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	Figure 1: Comparing 1kg each of AC, BBTM, PA Bitumen Mixture and 1kg DurabRoad Bitumen Mixture		Figure 1: Comparing 1kg each of AC, BBTM, PA Bitumen Mixture and 1kg DurabRoad Bitumen Mixture
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	This has a direct effect on the road’s lifecycle impact. With an increased durability, the road has to be maintained and relayed less often; meaning the total quantity of material used in the lifetime of the road is reduced. As the percentage of bitumen in a road is usually quite low (around 4-5%), with aggregates comprising the highest percentage of total materials, if the durability increases by increasing or altering the bitumen content slightly, the reduction of overall environmental impact of the road is a lot more significant as the number of maintenance and relaying cycles reduces. The following figure explains this.		This has a direct effect on the road’s lifecycle impact. With an increased durability, the road has to be maintained and relayed less often; meaning the total quantity of material used in the lifetime of the road is reduced. As the percentage of bitumen in a road is usually quite low (around 4-5%), with aggregates comprising the highest percentage of total materials, if the durability increases by increasing or altering the bitumen content slightly, the reduction of overall environmental impact of the road is a lot more significant as the number of maintenance and relaying cycles reduces. The following figure explains this.
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	Figure 2: Total life cycle costing analysis of the road system over 50 years		Figure 2: Total life cycle costing analysis of the road system over 50 years
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−	This article was originally published ~~[https://www.bsria.co.uk/news/article/durabroads-life-cycle-costing-analysis-of-road-systems/ here]~~ in June 2017 by BSRIA.	+	This article was originally published in June 2017 by BSRIA.

	Written by Divya Deepankar, Research Engineer, BSRIA Sustainable Construction Group.		Written by Divya Deepankar, Research Engineer, BSRIA Sustainable Construction Group.
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	* Types of road and street.		* Types of road and street.

−	[[Category:Research_/_Innovation]] [[Category:Construction_techniques]]	+	[[Category:Research_/_Innovation]] [[Category:DCN_Research,_Development_and_Innovation]] [[Category:Construction_techniques]]

Editor at 09:53, 3 August 2017

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	When compared against the lifecycle of the standard bitumen mixtures, the DurabRoads bitumen showed promising results by LCA. Every DurabRoads alternative showed an improvement in terms of environmental impact using the IPCC method on the standard mixtures over a 50-year lifecycle. Based on the LCA model results, the BBTM alternative surface layer has the lowest environmental impacts.		When compared against the lifecycle of the standard bitumen mixtures, the DurabRoads bitumen showed promising results by LCA. Every DurabRoads alternative showed an improvement in terms of environmental impact using the IPCC method on the standard mixtures over a 50-year lifecycle. Based on the LCA model results, the BBTM alternative surface layer has the lowest environmental impacts.

−	~~The experiments are still being carried out on~~ the ~~DurabRoads bitumen and these~~ results ~~shall be discussed in future. The next article will discuss~~ the ~~comparative economic viability~~ of the ~~individual road systems based~~ on the life cycle ~~costing analysis~~.	+	In August 2017, the results of the life cycle assessment and life cycle costing analysis of the warm mix asphalt materials were presented by BSRIA.
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		+	Divya Deepankar, Research Engineer, BSRIA Sustainable Construction Group, said:
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		+	“Based on the results obtained so far, the road layers composed of the warm mix asphalt materials have better environmental and economic performance across the life cycle of the road system studied.
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		+	Going forward, the durability factor obtained from the pilot test results of the pilot road tested in Spain will be incorporated to analyse and infer the best case. These results will be reported and presented soon."

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Editor at 09:43, 4 July 2017

2017-07-04T09:43:15Z

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−	[[File:Durabroads-web-screen-grab.jpg]]	+	[[File:Durabroads-web-screen-grab.jpg\|link=File:Durabroads-web-screen-grab.jpg]]

	The objective of the DurabRoads project is to design, develop and demonstrate cost-effective, eco-friendly and optimised long-life roads, by means of innovative designs, and the use of greener materials.		The objective of the DurabRoads project is to design, develop and demonstrate cost-effective, eco-friendly and optimised long-life roads, by means of innovative designs, and the use of greener materials.
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	Figure 1: Comparing 1kg each of AC, BBTM, PA Bitumen Mixture and 1kg DurabRoad Bitumen Mixture		Figure 1: Comparing 1kg each of AC, BBTM, PA Bitumen Mixture and 1kg DurabRoad Bitumen Mixture

−	[[File:Durabroadsgraph1.jpg]]	+	[[File:Durabroadsgraph1.jpg\|link=File:Durabroadsgraph1.jpg]]

	The original bitumen mixtures were compared to the new alternative bitumen mixture which is shown in Figure 1 using the IPCC method.		The original bitumen mixtures were compared to the new alternative bitumen mixture which is shown in Figure 1 using the IPCC method.
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	This has a direct effect on the road’s lifecycle impact. With an increased durability, the road has to be maintained and relayed less often; meaning the total quantity of material used in the lifetime of the road is reduced. As the percentage of bitumen in a road is usually quite low (around 4-5%), with aggregates comprising the highest percentage of total materials, if the durability increases by increasing or altering the bitumen content slightly, the reduction of overall environmental impact of the road is a lot more significant as the number of maintenance and relaying cycles reduces. The following figure explains this.		This has a direct effect on the road’s lifecycle impact. With an increased durability, the road has to be maintained and relayed less often; meaning the total quantity of material used in the lifetime of the road is reduced. As the percentage of bitumen in a road is usually quite low (around 4-5%), with aggregates comprising the highest percentage of total materials, if the durability increases by increasing or altering the bitumen content slightly, the reduction of overall environmental impact of the road is a lot more significant as the number of maintenance and relaying cycles reduces. The following figure explains this.

−	[[File:Durabroadsgraph2.jpg]]	+
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		+	Figure 2: Total life cycle costing analysis of the road system over 50 years
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		+	[[File:Durabroadsgraph2.jpg\|link=File:Durabroadsgraph2.jpg]]

	Figure 2 shows the total environmental impact of the surface layers of each of the road systems over its 50-year lifecycle using the IPCC method where it is assumed that the DurabRoads mixture has a higher durability factor, which is considered as 1.5 times that of the original system for this analysis.		Figure 2 shows the total environmental impact of the surface layers of each of the road systems over its 50-year lifecycle using the IPCC method where it is assumed that the DurabRoads mixture has a higher durability factor, which is considered as 1.5 times that of the original system for this analysis.

Editor: Created page with "File:Durabroads-web-screen-grab.jpg The objective of the DurabRoads project is to design, develop and demonstrate cost-effective, eco-friendly and optimised long-life roads,..."

2017-07-04T09:42:15Z

Created page with "File:Durabroads-web-screen-grab.jpg The objective of the DurabRoads project is to design, develop and demonstrate cost-effective, eco-friendly and optimised long-life roads,..."

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[[File:Durabroads-web-screen-grab.jpg]]

The objective of the DurabRoads project is to design, develop and demonstrate cost-effective, eco-friendly and optimised long-life roads, by means of innovative designs, and the use of greener materials.

For more information, see DurabRoads.

This article illustrates the life cycle assessment study of the bitumen mixtures undertaken by BSRIA and shows some of the results obtained so far.

BSRIA has been involved in conducting the life cycle assessment (LCA) analysis of the potential new road layer mixtures formulated by the DurabRoads project partners to quantify their environmental impacts.

For this, an analysis of the road processes was carried out including road construction, road maintenance, road relaying and recycling, using the techniques of LCA to achieve this. In the LCA analysis of DurabRoads, three pavement mixtures- PA (porous asphalt), BBTM (Béton Bitumineux Mince), and AC (asphalt concrete), were taken as the three base cases and the partners set about trying to improve their composition.

A bitumen mixture for DurabRoads (referred to as DurabRoads Bitumen here), was designed to be used with all three cases, following which the overall mixtures were also modified with different additives and steel slag and basalt as aggregates.

The LCA study was first used to gauge the environmental impact of 1kg of the bitumen mix alone for the AC, BBTM, PA and DurabRoads Bitumen mixtures. Then the environmental impact assessment of the material for each of the road systems was carried out for a unit area of 7.4 m x 1,000 m, looking at the environmental impacts for a 50-year lifecycle.

Figure 1: Comparing 1kg each of AC, BBTM, PA Bitumen Mixture and 1kg DurabRoad Bitumen Mixture

[[File:Durabroadsgraph1.jpg]]

The original bitumen mixtures were compared to the new alternative bitumen mixture which is shown in Figure 1 using the IPCC method.

The IPCC method denotes the results by normalising the environmental impact into kg of CO2 equivalent. It can be seen that with the additional additives in the DurabRoads bitumen, the environmental impact of 1kg of the DurabRoads bitumen by the IPCC method is higher, making it appear worse than the currently used bitumen mixtures. However, it must be noted that this doesn’t imply that the DurabRoads bitumen must be discarded citing the higher environmental impacts as the obvious reason.

The additives and aggregates used in the DurabRoads bitumen mixture have caused the 1kg of material to have a greater environmental impact than current mixtures; however, these additives do improve the durability of the road surface, which will be able to withstand high traffic densities and adverse weather conditions for longer.

This has a direct effect on the road’s lifecycle impact. With an increased durability, the road has to be maintained and relayed less often; meaning the total quantity of material used in the lifetime of the road is reduced. As the percentage of bitumen in a road is usually quite low (around 4-5%), with aggregates comprising the highest percentage of total materials, if the durability increases by increasing or altering the bitumen content slightly, the reduction of overall environmental impact of the road is a lot more significant as the number of maintenance and relaying cycles reduces. The following figure explains this.

[[File:Durabroadsgraph2.jpg]]

Figure 2 shows the total environmental impact of the surface layers of each of the road systems over its 50-year lifecycle using the IPCC method where it is assumed that the DurabRoads mixture has a higher durability factor, which is considered as 1.5 times that of the original system for this analysis.

When compared against the lifecycle of the standard bitumen mixtures, the DurabRoads bitumen showed promising results by LCA. Every DurabRoads alternative showed an improvement in terms of environmental impact using the IPCC method on the standard mixtures over a 50-year lifecycle. Based on the LCA model results, the BBTM alternative surface layer has the lowest environmental impacts.

The experiments are still being carried out on the DurabRoads bitumen and these results shall be discussed in future. The next article will discuss the comparative economic viability of the individual road systems based on the life cycle costing analysis.

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This article was originally published [https://www.bsria.co.uk/news/article/durabroads-life-cycle-costing-analysis-of-road-systems/ here] in June 2017 by BSRIA.

Written by Divya Deepankar, Research Engineer, BSRIA Sustainable Construction Group.

--[[User:BSRIA|BSRIA]]

= Find out more =

=== Related articles on Designing Buildings Wiki ===

* BSRIA articles on Designing Buildings Wiki.
* DurabRoads.
* Kerbs.
* Life Cycle Costing.
* Overview of the road development process.
* Pavement.
* Road construction.
* Road improvement scheme consultation.
* Road joints.
* Smart technology.
* Types of road and street.

[[Category:Research_/_Innovation]] [[Category:Construction_techniques]]