Insights into early hydration of Portland limestone cement from infrared spectroscopy and isothermal calorimetry
Journal article, 2010

Isothermal calorimetry and diffuse reflectance infrared DR–FTIR spectroscopy are combined to correlate evolutions of spectroscopic signatures with rates of chemical reactions as reflected in the rate of heat emitted during the first 38 h of cement hydration. Portland limestone cement mortar is employed and the analysis is repeated for two different mixing procedures. Intensive blender mixing with quartz sand is found to cause activation of the cement resulting in a faster hydration process. At early stages of hydration, two types of C–S–H are formed. The spectral intensity of the earlier C–S–H is found to saturate, while that of the later form continues to acquire intensity throughout the 38 h of the experiment. Evidences are presented which support the interpretation that the two forms differ mainly in morphology and water content. Simultaneously with the saturation of the early C–S–H, a transient species is observed with DR–FTIR. This species correlates with the observed thermogram fine-structure.

Calcium–silicate–hydrate (C–S–H)

Hydration products





Rikard Ylmén

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Lars Wadsö

Lund University

Itai Panas

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Cement and Concrete Research

0008-8846 (ISSN)

Vol. 40 10 1541-1546

Subject Categories

Physical Chemistry

Analytical Chemistry

Other Materials Engineering



More information

Latest update

3/2/2018 9