Development of Geomaterial-Based Media for Permeable Reactive Barriers to Treat Leachate from Solid Waste Landfills in Sri Lanka

埼玉大学博士(学術)博士論文要約 全文公開予定 : 未定textapplication/pdfthesi

Development of Geomaterial-Based Media for Permeable Reactive Barriers to Treat Leachate from Solid Waste Landfills in Sri Lanka

学位記号番号 : 博理工乙第235号博士の専攻分野の名称 : 博士(学術) 学位授与年月日 : 平成28年3月24日textapplication/pdfthesi

A Machine-Learnt Approach to Market Segmentation and Purchase Prediction Using Point-Of-Sale (POS) Data

This book contains a selection of revised and extended research articles written by prominent researchers participating in the international conference on Advances in Engineering Technologies and Physical Science is held in London, UK, ..

A sustainable pavement concrete using warm mix asphalt and hydrated lime treated recycled concrete aggregates

Recently, increasing material prices coupled with more acute environmental awareness and the implementation of regulation has driven a strong movement toward the adoption of sustainable construction technology. In the pavement industry, using low temperature asphalt mixes and recycled concrete aggregate are viewed as effective engineering solutions to address the challenges posed by climate change and sustainable development. However, to date, no research has investigated these two factors simultaneously for pavement material. This paper reports on initial work which attempts to address this shortcoming. At first, a novel treatment method is used to improve the quality of recycled concrete coarse aggregates. Thereafter, the treated recycled aggregates were used in warm mix asphalt at varied rates to replace virgin raw coarse aggregates. The asphalt concrete mixes produced were tested for modulus, tensile strength, permanent deformation, moisture susceptibility and fatigue life. The comparison of these properties with that of the mixes using the same rates of untreated course aggregates from the same source has demonstrated the effectiveness of the new technology. Lastly, the cost, material and energy saving implications are discussed

Investigation of coconut shell biochar as an eco-friendly additive to mitigate the alkali-silica reaction in recycled aggregate concrete

Alkali-Silica Reaction (ASR) in Recycled Aggregate Concrete (RAC) is one of the main chal-lenges in using demolished concrete in construction. Several methods are available to mitigatethe impact of ASR, and they have less circular economic potential. This study aims - to investi-gate the possibility of coconut shell biochar (CSB) as an eco-friendly additive to mitigate ASRin RAC. In this investigation, the authors have conducted cement mortar bar test experimentsaccording to the American Society for Testing and Materials (ASTM 1260) standard, ScanningElectron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDS). Studies havefound a higher rate of ASR in recycled concrete aggregate (RCA) compared with natural con-crete aggregate (NCA). More importantly, it is found that CSB can adsorb cations (Na+ andK+) that cause ASR in RAC, thereby reducing ASR while not compromising concrete strength.Hence, the authors concluded that CSB can effectively mitigate ASR in RAC while sequestrat-ing carbon into concrete structures

Location of source of voltage unbalance in an interconnected network

Identification of principal contributors to voltage unbalance and hence the implementation of suitable corrective measures has become an issue of concern for some network providers. In order to comply with stipulated limits, these network service providers require the development of quantitative measures that are reliable. For simple radial networks, the identification of sources may be seen as a trivial task. However, for interconnected networks which contain untransposed transmission lines and unbalanced loads, the identification of sources of unbalance is a non-trivial task. This paper gives a systematic theoretical approach that can be used to study the voltage unbalance behaviour exhibited by line and load asymmetries in interconnected network environments. A study network is initially analysed, and the outcomes are employed to develop a new concept termed dasiavoltage unbalance emission vectorpsila to ascertain the overall influence made by an asymmetrical line or a load on voltage unbalance in a global sense. Using the voltage unbalance emission vectors of individual lines and loads, a technique has been developed which enables the identification of dominant contributors to voltage unbalance levels. Assessments made employing the above technique on the study system are confirmed using unbalanced load flow analysis