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IJEMS Vol.13(2) [April 2006] >


Title: Influence of strong alkaline substances (sodium carbonate and sodium bicarbonate) in mixing water on strength and setting properties of concrete
Authors: Reddy, V Venkateswara
Rao, H Sudarsana
Jayaveera, K N
Issue Date: Apr-2006
Publisher: CSIR
IPC CodeC01D 7/00, C04B
Abstract: The quality of mixing and curing water plays a vital role in production and application of concrete. In the present study, the effect of strong alkaline substances like sodium carbonate (Na2CO3) and sodium bicarbonate (NaHCO3) on setting time and strength development of concrete is assessed under the laboratory conditions. The results indicate that Na2CO3 in deionised water accelerates the initial as well as final setting times whereas the other compound NaHCO3 retards the initial and final setting times in all concentrations. Na2CO3 and NaHCO3 in deionised water decrease the compressive and tensile strength of concrete specimens significantly at 28 days and 90 days. Comparison of the results of strong alkaline compounds with those of the control mix reveals that both Na2CO3 and NaHCO3 decrease the compressive and tensile strength significantly. The rate of decrease is increasing with the increase in concentration. The present work analyses the hydration characteristics of concrete using the technique of X-ray diffraction (XRD) and useful conclusions are obtained regarding the influence of strong alkaline substances.
Page(s): 123-128
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Source:IJEMS Vol.13(2) [April 2006]

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