Insights into early hydration of Portland limestone cement from infrared spectroscopy and isothermal calorimetry
Artikel i vetenskaplig tidskrift, 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

Calorimetry

Hydration

Spectroscopy

Författare

Rikard Ylmén

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Lars Wadsö

Lunds universitet

Itai Panas

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Cement and Concrete Research

0008-8846 (ISSN)

Vol. 40 10 1541-1546

Ämneskategorier

Fysikalisk kemi

Analytisk kemi

Annan materialteknik

DOI

10.1016/j.cemconres.2010.06.008