Faustino P.,Mouchel Scotland Transerv |
Goncalves F.,Amey |
Bras A.,University of Bath |
Nunes A.,CDAC SECIL
Journal of Civil Engineering and Management | Year: 2017
This article compares two models for the prediction of lifetimes of reinforced concrete structures in carbonation environments based on different tests: carbonation test-based modelling and air permeability test-based modelling. The study also includes experimental testing of five concrete mixes with different types of cement in order to validate the models using safety factors. The tests included compressive strength, accelerated carbonation and air permeability. Both models are defined in a European standard as being alternative to each other, meaning that their results for the same concrete composition and the same environment should converge. The results show that both current models can scarcely constitute alternative to each other. Design lifetime results are far from similar for each concrete mix and each exposure class. The different nature of each test–accelerated carbonation and air permeability–and their different characteristic such as the scattering of results and the unrelated parameters of the modelling equations are some of the features discussed, including the possibility of using different safety factors as function of the model and definition of possible correlation between tests. © 2017 Vilnius Gediminas Technical University (VGTU) Press.
Jones N.,Amey |
Lourenco S.D.N.,University of Hong Kong |
Paul A.,University of Cardiff
E3S Web of Conferences | Year: 2016
This paper presents an exploratory study on surfactants as additives to improve soil properties. It is hypothesized that surfactant molecules populate the air-water interfaces reducing surface tension and suction thus allowing a control of the mechanical response of the soil. Suction measurements by means of a high suction tensiometer, compaction tests and Atterberg limits were conducted in mixtures of sand and kaolin, with and without a surfactant solution. The results revealed a prominent effect on suction, but to a lesser extent on the Atterberg limits and compaction behavior (the maximum dry density). This targeted effect of the surfactants suggests its molecules populate, not only the air-water interfaces decreasing surface tension, but may be adsorbing to the clay particles and forming micelles in the pore water as well. Therefore the interplay between the three may influence the soil behavior. © 2016 The Authors.
Jackson C.,Amey |
Lamont-Black J.,Electrokinetic Ltd. |
Alder D.,Northumbria University |
White C.,Electrokinetic Ltd.
Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Conference on Soil Mechanics and Geotechnical Engineering, ECSMGE 2015 | Year: 2015
Repair of earthwork failures involving landslips represents significant expenditure across the UK highways network each year. Traditional engineering solutions involve excavation and import of new construction materials, resulting in waste requiring off-site disposal to landfill and a relatively high carbon footprint. Working for the Highways Agency in England, Amey proposed remediation of a failing embankment using the pioneering electrokinetic geosynthetic treatment technique. This innovative technique involves in-situ remediation of the failed soil masses rather than excavation and replacement, with the potential for reduced vegetation clearance and a much lower carbon footprint. This scheme is one of the first pilot schemes implementing the technique on a full scale remediation project and involved close collaboration between Amey, their contractors, the Highways Agency and Electrokinetic Ltd. This paper outlines the design and implementation aspects of the project and summarises the findings of the post construction verification. © The authors and ICE Publishing: All rights reserved, 2015.
Shah J.,Amey |
Shah J.,University of Birmingham |
Jefferson I.,University of Birmingham |
Ghataora G.,University of Birmingham |
Hunt D.,University of Birmingham
Geotechnical Special Publication | Year: 2014
The concept of sustainability and resilience has gained significant importance in recent years in the infrastructure engineering industry. Key challenges currently faced by the infrastructure industry worldwide include obsolescence, growing demands, climate change, increased vulnerability, demand for multifunctionality, and growing interdependencies among different asset types. With the recent changes in the economic, social, and environmental scenarios, an increasing pressure exists to develop robust, flexible, and multifunctional asset management solutions that not only suit the needs of the present, but also are safe, secure, and resilient to what the future may hold. Ultimately all infrastructure assets interact with the ground, and their integrity relies substantially on the performance of geotechnical assets, thus making geotechnical asset management a critical starting point in future proofing the infrastructure network. The paper highlights the need to devise resilient asset management solutions. The paper focuses on two transport modes, namely highways and railways, and aims to present an asset management framework that will test the resiliency of current geotechnical solutions to the plausible conditions of the future. The proposed asset management framework will enable strategic decision makers to evaluate the resilience potential of proposed geotechnical asset management solutions in light of future conditions with varying socioeconomic and environmental patterns. © 2014 American Society of Civil Engineers.
Sunderland J.,Amey |
O'Day P.,Birmingham City Council
Proceedings of the Institution of Civil Engineers: Civil Engineering | Year: 2012
This paper shows how the private finance policy pursued by the UK government, applied to the delivery of highway maintenance services in Birmingham, provides a framework for the delivery of whole-life highways remediation, rehabilitation and maintenance needs at an affordable cost. Delivery of a best whole-life cost solution and the continual incentive to minimise expenditure results in a drive to optimise the use of physical and human resources, which in turn delivers environmental sustainability objectives. The £2.7 billion Birmingham highways maintenance and management service was also developed with local social and economic improvement in mind and this has shaped the interface with residents and engagement of the local supply chain in the delivery of the project.
Qamar F.,AMEY |
Ali M.,Mohammad Ali Jinnah University
Engineering Structures | Year: 2015
This paper explains a concrete repair project at Midland Links Motorway bridges in West Midlands UK in which a novel modification technique was adopted and discusses the applicability of same approach to other highway structures around the world. The modification to the traditional supporting steelwork system (SSS) required for carrying out concrete repairs to a deteriorated non-standard structure is made. The non-standard structure of Midland Links under study was a viaduct passing over a river (i.e. waterway). Traditional SSS was not possible to use because the trestle arrangement could not be placed in waterway. Therefore, trestles need to be avoided which leads to introduction of a hanging system. For this, existing Type E truss of the traditional SSS was modified to incorporate hanging arrangement (hangers and needle beams) instead of fabrication of new SSS. This modified SSS was analyzed using the finite element software LUSAS. The section capacities of the truss members were assessed under the applied loading and over-stressed members were satisfied by using enlarged sections. Finally, cost analysis for new and modified SSS was carried out. It was found that the later option was an economical solution compared to the earlier one. © 2015 Elsevier Ltd.
Das S.C.,Amey |
Pouya H.S.,Coventry University |
Ganjian E.,Coventry University
Journal of Materials in Civil Engineering | Year: 2015
This paper describes the findings of the experimental works undertaken to investigate the performance of zinc-rich paint (ZRP) to provide cathodic protection to chloride-contaminated RC structures. The program of experimental works was designed and conducted to assess four principal properties, viz (1) conductivity, (2) adhesion with concrete (short term and long term), (3) durability, and (4) electrochemical polarization. These properties considered together define the ability and effectiveness of the materials to act as an anode for impressed current cathodic protection. The research findings indicated that a specific proprietary ZRP product showed that optimum conductance was obtained with three coats producing a 280-320 μm thickness, with good adhesion to the concrete substrate, in which values obtained ranged between 1.65 and 3.5 MPa with and without applied current. It was capable of withstanding/supporting high levels of current, i.e., more than 300 mA/m2, and the service life of the ZRP coating was estimated to be well in excess of 20 years at an applied current density of 10 mA/m2. © 2015 American Society of Civil Engineers.
Christodoulou C.,AECOM Technology Corporation |
Sharifi A.,Amey |
Das S.,Amey |
Goodier C.,Loughborough University
Proceedings of the Institution of Civil Engineers: Bridge Engineering | Year: 2014
The Midland Links motorway viaducts (MLMV) are a series of reinforced concrete structures comprising 21 km of elevated motorway around the outer circumference of Birmingham. Deterioration was identified early in their serviceable life due to chloride induced corrosion of the steel reinforcement. An electrochemical treatment utilising an impressed current cathodic protection (ICCP) was successfully trialled in 1987 with the first large-scale commercial application of the treatment on the network in 1991. Since then it has been the principal corrosion management strategy for the MLMV, with 740 structures currently protected by ICCP. The aim of this paper is to offer a brief historical review of the MLMV network, discuss the deterioration mechanisms and review the historical developments of ICCP together with its overall performance as a corrosion-management method. Recent developments in cathodic protection technology and secondary beneficial effects of the ICCP previously not recognised are also discussed on how they can potentially result in significant cost savings for maintenance agencies for this and other similarly protected structures.
Galatioto F.,Northumbria University |
Bell M.,Northumbria University |
Hill G.,Northumbria University |
Rose P.,Amey |
Hodges N.,Northumbria University
19th Intelligent Transport Systems World Congress, ITS 2012 | Year: 2012
Local Authorities and Governments are under pressure to meet air quality and carbon emissions targets, however in several cases high level scale modelling outputs do not truly represent traffic conditions in local urban environments and associated hot spot pollutant concentrations which are determined by the built environment (canyons, road orientation, etc.). To address this gap in knowledge, Newcastle University recently developed an Integrated Database and Assessment Platform (NUIDAP), to bring together data from pervasive environmental and traffic monitoring systems with existing information, such as ITS and UTMC sources and traffic models. This paper presents the preliminary analysis and results that the Newcastle Team, with the support of AMEY, made using the software platform which integrates different data sources in order to identify problems, understand causes and formulate the solutions to air quality and manage traffic to alleviate, even prevent, pollution hotspots. This paper describes and presents evidence and results of the use of two types of microscale approaches for air quality assessment, the first using novel pervasive sensors, and the second employing modelling using an enhanced instantaneous emission model within the AIMSUN microsimulator. Scenarios modelled, including speed reduction and mode shift to public transport with reduction of traffic volumes, will be described and the outputs with and without the enhanced emission model are compared.
Amey | Date: 2011-05-18
A process for making 3-aminopentanenitrile from a crude 2-pentenenitrile (crude 2PN) comprising 2-pentenenitrile, 2-methyl-2-butenenitrile, and 2-methyl-3-butenenitrile includes contacting the crude 2PN with an ammonia-containing fluid and water. The ammonia-containing fluid can include at least one reactant selected from the group consisting of ammonia, aqueous ammonia, and ammonium hydroxide.