Recent Submissions

  • An Electron Microscope Study of Biomineralisation for Geotechnical Engineering Purposes

    Wilkinson, Stephen; Rajasekar, Adharsh (Springer, 2018-09-21)
  • Managing knowledge associated with carbon reduction initiatives

    Renukappa, Suresh; Suresh, Subashini; Egbu, Charles. (Construction Leadership Council, 2014)
  • New offsite production and business models in construction: priorities for the future research agenda

    Goulding, J.S.; Pour Rahimian, F.; Arif, M.; Sharp, M.D. (Taylor and Francis, 2014-03-11)
  • Assessing sustainability of employee suggestion schemes: a framework

    Lasrado, Flevy; Arif, Mohammed; Rizvi, A. (Emerald, 2015-11-16)
  • Creating a better healing environment in Qatari healthcare sector: Exploring the research agenda for the future

    Alhorr, Yousef; Arif, Mohammed; Bano, Tabassum; Egbu, Charles; Mazroei, Ahmed; Elsarrag, Esam (Elsevier, 2015-06)
  • Understanding knowledge sharing in the Jordanian construction industry

    Arif, Mohammed; Mohammed, Al-Zubi; Gupta, Aman Deep (2015-07-13)
  • Knowledge sharing maturity model for Jordanian construction sector

    Arif, Mohammed; Al Zubi, Mohammed; Gupta, Aman Deep; Egbu, Charles; Walton, Robert O.; Islam, Rubina (Emerald, 2017-01-16)
  • Impact of indoor environmental quality on occupant well-being and comfort: A review of the literature

    Al horr, Yousef; Arif, Mohammed; Katafygiotou, Martha; Mazroei, Ahmed; Kaushik, Amit; Elsarrag, Esam (2016-06)
  • When statutes collide: potential recovery of own party adjudication costs

    Hetherton, Tony; Charlson, Jennifer (Emerald Group Publishing Limited, 2015-10-12)
    Purpose This research examines the potential recovery of own party adjudication costs under the Late Payment of Commercial Debts Regulations 2013. Design/methodology/approach The interaction between The Late Payment of Commercial Debts Regulations 2013 (derived from European Directive 2011/7/EU on combating late payment in commercial transactions) and the Local Democracy, Economic Development and Construction Act 2009 including reference to case law was explored. A qualitative research framework was used to collect primary data through semi-structured interviews with adjudication experienced construction industry professionals. Findings It was discovered that adjudicators are awarding own party costs under the Regulations but there was disagreement on the issues in both the literature and amongst the interviewees. Research limitations/ implications A definitive judgement is awaited from the Technology and Construction Court. Originality/ Value This paper will be of value to construction industry adjudication professionals.
  • Developments in the United Kingdom Dispute Resolution Process

    Akintoye, Akintola; Renukappa, Suresh; Lal, Hamish (ASCE, 2015-02)
    It is generally recognized that the U.K. construction industry is associated with low profit, delay in payments, cash flow concerns, short-term relationships compared with other industries, and high levels of business failure. In particular, claims and disputes have proliferated in the industry largely due to unfair payment practices. Therefore, to encourage a swifter and more economic method of resolving construction disputes by way of adjudication, the U.K. Housing Grants, Construction and Regeneration Act 1996 (HGCRA) came into force on October 1st, 2011in England andWales, and November 1st, 2011 in Scotland. This study presents the HGCRA 1996 Act—highlighting its strengths and weaknesses—along with the new 2009 Construction Act. The study additionally presents awareness of the new Act, key reasons for amending the HGCRA 1996 Act, and the impact of key changes in the Act on the dispute resolution process. The paper concludes that the new Act is perceived as being more effective at improving cash flow in the construction supply chain and is expected to encourage parties to resolve disputes by adjudication—but it will have to overcome the historical fact that integration of such proposed changes in construction may be a complex issue.
  • Effect of wind characteristics on gas dispersion in porous media

    Wilkinson, Stephen (International Society for Porous Media, 2017-05)
    Greenhouse gases have the key role in global warming. Soil is a source of greenhouse gases such as methane (CH4). Radon (Rn) which is a radioactive gas can emit form soil into the buildings and causes health concerns. Different soil properties can affect gas emissions inside/from soil including temperature, humidity, air pressure and vegetation (Oertel et al., 2016). It’s shown in many cases that pressure fluctuations caused by wind play an important role in transport of gas in soil and other porous media. An example is: landfill gas emissions (Poulsen et al., 2001). We applied a novel experimental equipment for measuring controlled wind turbulence on gas transport in porous media. This set-up was utilized to evaluate the effect of wind turbulence on gas transport in relation to the depth of porous medium. Experiments were carried out with binary diffusion of CO2 and air as tracer gases with average vertical wind speeds of 0.02 to 1.06 m s-1. 13 different wind conditions with different speed and fluctuations were applied. Five oxygen sensors were places inside sample at different depths to measure air transportation within porous media and total of 39 experiments were carried out. Gas transport in porous media is described by advection-dispersion equation. Gas transport is quantified as a dispersion coefficient. Oxygen breakthrough curves as a function of distance to the surface of the porous medium exposed to wind were derived numerically with an explicit forward time, central space finite-difference based model to assess gas transport. We showed that wind turbulence-induced dispersion of gas is an important transport mechanism that can increase gas transport with average of 45 times more than molecular diffusion under no-wind condition. Power spectrum density is calculated for all the 12 wind conditions to determine strength vibration of all the wind speeds.
  • Impact of knowledge management on the cost of poor quality

    Olayinka, Raymond; Suresh, Subashini; Chinyio, Ezekiel (2015-08)
  • Construction industry legal risk identification for SMEs

    Charlson, Jennifer; Oduoza, Chike (Sweet and Maxwell, 2016)
  • An analysis of passive earth pressure modification due to seepage flow effects

    Hu, Zheng; Yang, Zhongxuan; Wilkinson, Stephen Philip; Wilkinson, Stephen; Zhejiang University, 12377, Department of Civil Engineering, Zhejiang University, B700, Anzhong Building, 866 Yuhangtang Road, Hangzhou, Zhejiang, China, 310058, ;; Zhejiang University, Department of Civil Engineering, B712 Anzhong Building, Zijingang Campus, Zhejiang University, 866 Yuhangtang, Hangzhou, China, 310058, ;; University of Wolverhampton, 8695, Department of Civil Engineering, Wolverhampton, West Midlands, United Kingdom of Great Britain and Northern Ireland; (NRC Research Press, 2017-09-13)
    Using an assumed vertical retaining wall with a drainage system along the soil-structure interface, this paper analyses the effect of anisotropic seepage flow on the development of passive earth pressure. Extremely unfavourable seepage flow inside the backfill, perhaps due to heavy rainfall, will dramatically increase the active earth pressure while reducing the passive earth pressure; thus increasing the probability of instability of the retaining structure. In this paper, a trial and error analysis based on limit equilibrium is applied to identify the optimum failure surface. The flow field is computed using Fourier series expansion, and the effective reaction force along the curved failure surface is obtained by solving a modified Kötter equation considering the effect of seepage flow. This approach correlates well with other existing results. For small values of both the internal friction angle and the interface friction angle, the failure surface can be appropriately simplified with a planar approximation. A parametric study indicates that the degree of anisotropic seepage flow affects the resulting passive earth pressure. In addition, incremental increases in the effective friction angle and interface friction both lead to an increase in the passive earth pressure.
  • MICP and Advances towards Eco-Friendly and Economical Applications

    Rajasekar, Adharsh; Moy, Charles K.S.; Wilkinson, Stephen (IOP Publishing Ltd, 2017-07)
    Biomineralization is a natural process aided by living organisms. Due to its applicability in ground improvement and bioremediation, Microbially Induced Calcite Precipitation (MICP) is an interdisciplinary field of study combining engineering, chemistry and microbiology. Bioremediation has been applied widely for contamination containment or removal, in this case it will be containment. MICP can also be applied to improve the efficiency of insitu bioremediation. Urease is an enzyme which can facilitate increased calcite precipitation. However the production of urease by bacteria and thus the resulting carbonate precipitation are inhibited by environmental factors including calcium concentration, bacterial concentration, pH and temperature. Under good conditions MICP can be used for heavy metal and radionuclide immobilization. However technologies such as bioconsolidation and biocementation require improvement such as time and cost. This paper highlights the application of MICP in addition to suggested improvements to make it more eco-friendly and sustainable.
  • Stimulation of Indigenous Carbonate Precipitating Bacteria for Ground Improvement

    Rajasekar, Adharsh; Moy, Charles K S; Wilkinson, Stephen (IOP Publishing, 2017-05)
    Calcite minerals are precipitated in soil through biomineralisation which can be either organic or inorganic in nature. Biomineralisation can be employed to improve ground conditions in its natural state. Usually, studies of applied biomineralisation are highly interdisciplinary involving expertise from engineers, chemists and microbiologists. In this paper, we study the potential of biomineralisation from indigenous bacteria present in soil. The soil samples were collected from a high permeable zone and the bacteria that inhabit the soil were stimulated at a temperature of 15°C. A cementation solution consisting of 500mM calcium chloride, urea and nutrient broth at a pH of 7.5 was added to the soil samples. Inorganic precipitation was found to be dominant and was more efficient when compared to organic precipitation. Carbonate precipitation data indicated that inorganic precipitation were 1.37 times better at carbonate formation in comparison to organic precipitation. Scanning Electron Microscopy analysis identified cementation bonds formed between soil particles. It was deducted that organic precipitation is dependent on temperature, and may take an extended time at such low temperature. The preliminary data presented in this paper suggests that the implementation of biomineralisation with in-situ microbes is promising but requires further laboratory and field investigation before being considered for engineering application.

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