Studying the adsorption of triethanolamine from solutions, the chemisorption of the adsorbate on the surface of the cement clinker can be detected by flow microcalorimetric measurements. The results supported by thermal desorption measurements definitely proved that the triethanolamine molecules practically form a bimolecular adsorption layer on the surface of cement clinker in the saturation range, and the first adsorption layer is bound irreversibly to the clinker species. The difference between the displacement enthalpies on the original clinker samples and on those pretreated with triethanolamine was found to be almost one order of magnitude indicating that the sorption of triethanolamine on the surface of the original clinker sample produces a rather high change of enthalpy which is principally caused by chemisorption. Significantly lower enthalpy changes were measured if triethanolamine had been adsorbed previously on the surface of the clinker, and in this case heat effects corresponding to physical adsorption can only be detected.
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