Browsing by Author "Singh, A"

Now showing 1 - 4 of 4

item: Conference-Full-text
Experimental study on moc cement based micro concrete for repairing of wide cracks in concrete pavement slabs
(Springer, 2021) Singh, A; Kumar, R; Goel, P; Pasindu, HR; Bandara, S; Mampearachchi, WK; Fwa, TF
Cracks of variable width and types can develop due to various factors like overloading, thermal expansion and contraction, moisture and temperature stresses, poor construction quality, loss of support underneath the slab, and other similar causes. Often a combination of these factors contributes to the propagation and widening of cracks over time resulting in surface roughness if not repaired properly. Wide crack even requires reconstruction or a full-depth repair. Cracks should be repaired with a durable material lasting for longer life. To repair these cracks, several materials and procedures have been developed. The efficiency of these materials and procedures depends on weather conditions and application efficiency. This study aims to develop a cost-effective magnesium oxychloride cement-based micro concrete for a faster repair of wide cracks; 25 mm or more. To simulate the conditions in the laboratory beam specimens cast and tested for flexure strength failure were used. Then broken beams were repaired by laboratory-developed MOC cement-based micro concrete and again tested for flexure strength. It was found that up to about 80% flexure strength can be restored in one day.
item: Conference-Full-text
Feasible treatment selection for routine maintenance of flexible pavement sing fuzzy logic expert system
(Springer, 2021) Kumar, R; Suman, SK; Singh, A; Pasindu, HR; Bandara, S; Mampearachchi, WK; Fwa, TF
Pavement maintenance management system motivates to provide a scientific tool for maintenance and rehabilitation of roads pavement at desired serviceability levels. In view of the fund’s constraints and the need for judicious spending of available resources, the maintenance planning and budgeting are required to be done based on scientific methods. Unfortunately, the current maintenance practices are ad-hoc and subjective in nature. Pavement condition responsive maintenance is very useful for judicious disbursement of maintenance funds. The objective of this paper is to select a feasible treatment for routine maintenance based on pavement condition parameters of flexible pavement using Fuzzy Logic Expert System (FLES). Six different national highways have been selected to provide the maintenance based on the PCI, traffic volume, pavement age, precipitation, temperature and budget. FLES offers a convenient tool to better represent the uncertainty involved in pavement condition rating and assessment. The pavement maintenance treatment needs are generally determined based on the results of visual inspection, which in most of the cases does not give an adequate representation of pavement condition. Treatment selection FLES model has considered anticipated distresses-based condition index, anticipated traffic, and prevailing climate, age of the pavement and budget for treatments. Model predicts treatment types based upon their expected life. The triangular membership function for all the parameter is considered and analyzed with sufficient number of fuzzy rules as suggested by the maintenance engineers. The predicted result was compared with the twenty-five maintenance engineer’s responses, which shows homological results. Hence, this approach may provide an appropriate and economically viable maintenance treatment.
item: Conference-Full-text
Revisiting the role of architectural design in creating green buildings - critical review of green building rating systems
(2017) Agrawal, A; Singh, A; Singh, D
In the context of drastic requirement of efficient use of resources and reduction of the adverse impacts of their blatant use like greenhouse gas emissions, contemporary architectural design is being driven by the paradigms of sustainable architecture & green building design. These theories are supplemented by codes comprising of categories & parameters like energy efficiency, water efficiency, materials and resource use & waste management, using which rating/certification systems have been developed that provide a certification/label of ‘greenness’ to the building. For the purposes of economic incentive and for complying with policies on local and global scale, almost every new building is aspiring for a ‘green’ certification based on the amount of credits that it accumulates as specified by the rating systems. An initial study reveals that many of these ‘credits’ can be achieved by employing efficient active systems or by using upgraded technology systems. The results vary depending upon the use, type, design & the location of the project resulting in variations in investment, performance results and efficiency. A detailed study of certain certified buildings has been carried out and it was found that very few buildings attempted the credits mentioned for overall efficiency through a passive design approach. The manner in which these rating systems have been formulated reveals that the scope for the architect to use architectural design as a tool to achieve a green/sustainable building design has been constrained. This paper studies and compares the categories available for rating systems and compares weightage of credits towards categories. As a conclusion, the paper tries to reinvigorate the significance of architectural design and highlights the inclusion of credits for architectural design in the rating systems.
item: Conference-Extended-Abstract
Studying the public transport user preferences in a city and the people’s willingness to shift to metro: the case of Jaipur
(Sri Lanka Society for Transport and Logistics, 2016) Singh, A; Parida, M; Gunaruwan, TL