Hydration process in Portland cement blended with activated coal gangue |
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| Authors: | Xian-ping Liu Pei-ming Wang and Min-ju Ding |
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| Institution: | (1) School of Mining Engineering and Metallurgy, National Technical University of Athens, 9 Heroon Polytechniou, 15773 Athens, Greece;(2) School of Chemical Engineering, National Technical University of Athens, 9 Heroon Polytechniou, 15773 Athens, Greece; |
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| Abstract: | This paper deals with the hydration of a blend of Portland cement and activated coal gangue in order to determine the relationship
between the degree of hydration and compressive strength development. The hydration process was investigated by various means:
isothermal calorimetry, thermal analysis, non-evaporable water measurement, and X-ray diffraction analysis. The results show
that the activated coal gangue is a pozzolanic material that contributes to the hydration of the cement blend. The pozzolanic
reaction occurs over a period of between 7 and 90 d, consuming portlandite and forming both crystal hydrates and ill-crystallized
calcium silicate hydrates. These hydrates are similar to those found in pure Portland cement. The results show that if activated
coal gangue is substituted for cement at up to 30% (w/w), it does not significantly affect the final compressive strength
of the blend. A long-term compressive strength improvement can in fact be achieved by using activated coal gangue as a supplementary
cementing material. The relationship between compressive strength and degree of hydration for both pure Portland cement and
blended cement can be described with the same equation. However, the parameters are different since blended cement produces
fewer calcium silicate hydrates than pure Portland cement at the same degree of hydration. |
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