A nondestructive one-sided wave reflection factor (WRF) test was applied to concrete with a variety of admixtures, including an accelerator, silica fume as replacement, a high-range water-reducing admixture, and a retarder. Tlie results are presented herein. The WRF test is sensitive to the presence of admixtures. In addition to WRF tests, dynamic modulus tests were performed on normal- and high-strength concretes. Tlie results from these tests are correlated with the results from the WRF tests. A neir, objective method for determining the time of occurrence of critical points on the WRF curve was developed. Tlie critical WRF points were found to correlate well with critical points in set time and cement hydration processes. Copyright ©2000. American Concrete Institute. All rights reserved.

K.V.L. Subramaniam

Department of Civil Engineering

J.R. Rapoport

J.S. Popovics

S.P. Shah

Indian Institute of Technology Hyderabad (IITH) is a premier institute of science and technology established in 2008. IITH has been consistently ranked in the&nbsp;<a href="https://iith.ac.in/reports/" rel="noopener noreferrer">top 10 institutes</a>&nbsp;in India for Engineering&nbsp;<a href="https://www.nirfindia.org/2021/EngineeringRanking.html" rel="noopener noreferrer" target="_blank">according to NIRF</a>&nbsp;making it one of the most coveted schools for science and technology in the country.

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Journal	ACI Structural Journal
ISSN	08893241