Browsing by Author "Kumar, R"

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item: Conference-Full-text
A comparative investigation on the effectiveness of awax and a resin based curing compound as an alternate of water curing for concrete pavement slab
(Springer, 2021) Goel, P; Kumar, R; Pasindu, HR; Bandara, S; Mampearachchi, WK; Fwa, TF
In this study, the effectiveness of two easily available concrete curing compounds in the Indian construction Industry namely; wax and synthetic resinbased, in comparison with water cured cubes and beams specimens of a paving concrete of 39 MPa compressive strength and 4.5 MPa flexural strength at 28-day has been reported. The concrete specimens were cast and kept for curing under different conditions such as in water, in the sunlight, and under the sunshade. Two coats of curing compounds as per the manufacturer’s instruction were applied on the surfaces of the concrete specimens and put in the sunlight and under the sunshade. The compressive and the flexural strength in comparison with water cured concrete specimens were evaluated. The study has shown 12% lower compressive strength and about 7% lower flexural strength for concrete samples cured with resin-based curing compound than the water cured samples. The study also indicates a reduction in compressive and flexural strengths of about 33% and 11%, respectively for waxbased curing compound. Finally, the study shows an upper hand for the resin-based curing compound, however, neither of them has shown potential as an alternate for the conventional water curing.
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.