Anushan, RDilaittan, VSivahar, VPiyathilake, SAKVMGamage, JCPHAbeygunawardane, AAGA2022-03-142022-03-142020-06Anushan, R., Dilaittan, V., Sivahar, V., Piyathilake, S.A.K.V.M., & Gamage, J.C.P.H. (2020). Retrospective determination of water-to-cement ratio (w/c) of concrete through ultrasonic pulse velocity measurements [Abstract]. In A.A.G.A. Abeygunawardane (Ed.), Towards smart society through innovative materials (p. 8). Department of Materials Science and Engineering, University of Moratuwa.http://dl.lib.uom.lk/handle/123/17341The objective of this research is to find a method to determine the water-cement ratio that has been used in a concrete during construction, retrospectively. Water-Cement ratio affects the properties of concrete including its strength. Ultrasonic Pulse Velocity (UPV) of concrete can be related to its strength. These inter-relations can be used as the tool to achieve our objective. Different grades of concrete with varying water-cement ratios were used in this study. 28-day strength was measured using the standard concrete cubes and UPV measurements also were done for the same samples. 28-day strength of concrete can be considered as its long-term strength, as it does not change much after 28 days. UPV and 28-day strength of concrete, both found to decrease with the increase of water- cement ratio. These reductions were due to increased volume of capillary voids and micro- cracks within concrete transition zone and porous structure within the interconnected hydrates. The relationships established can be used to predict the water-cement ratios used in concrete structures retrospectively.enWater-cement ratioUPVStrengthConference-AbstractEngineeringDepartment of Materials Science and Engineering2020Materials Engineering Symposium on Innovations for Industry 2020Katubeddap. 8Towards smart society through innovative materialsmiyurup@uom.lkdilaittan@gmail.com