Journal
CEMENT AND CONCRETE RESEARCH
Volume 95, Issue -, Pages 95-107Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2017.02.028
Keywords
Accelerated leaching; Blended cement (D); Cement paste (D); Degradation (C); Modelling (E)
Funding
- UNSW Canberra
- Overseas Study Program of Guangzhou Elite Project [12013194]
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A novel numerical method is proposed in this paper to model the leaching of various types of cement pastes in the ammonium nitrate solution by coupling chemical kinetics with chemical thermodynamics. Arrhenius equation and Eyring equation are applied to predict the rate constant of fast dissolution of portlandite in the ammonium nitrate, and a modified rate law is developed by incorporating the saturation ratio of the reaction. The estimations of leached depths from the proposed method comply with the well-known square root-time relationship and they also agree well with the reported experimental results. Moreover, the evolutions of porosity and major hydrate compositions during leaching are obtained. It is found that a simple linear relation exists for the acceleration factor of leaching in 6 M of ammonium nitrate with respect to leaching in pure water regardless of the type of the cement clinker. (C) 2017 Elsevier Ltd. All rights reserved.
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