Examination of portland cement paste hydrated in the presence of malic acid


When malic acid (MA) solutions are added to ordinary Portland cement (OPC), rapid heat evolution takes place, but  the hydration is retarded considerably at all MA concentrations. To understand the mechanism of retardation, UV-visible and IR spectral studies were made. The results showed that some interaction occurs between MA and certain constituents of OPC. XRD and TG/DTA studies confirmed the formation of a new reaction product due to interaction between MA and some of the mineral phases of Portland cement. The retardation of the hydration of Portland cement may be attributed to the formation of this new compound. 13 refs.

Primary author(s): Rai S; Chaturvedi S; Singh N B


Source: Cem.Concr.Res.


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