SIMULATION OF THE DEVELOPMENT OF PH IN THE PORE SOLUTION OF SLAG CEMENT PASTE AT EARLY AGE

Author(s): Peng Gao, Guang Ye, Jiangxiong Wei, Qijun Yu
Book Title: RILEM International Symposium on Concrete Modelling - CONMOD 2014
Editor: Kefei Li, Peiyu Yan and Rongwei Yang
ISBN: 978-2-35158-139-1
e-ISBN: 978-2-35158-140-7
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 273-280
Total Pages: 8
Language: English

Abstract: The prediction and control of the development of pH in the pore solutions of cement-based materials, particularly at early age, is important for both engineering practise and academic interests. This study aims to simulate the development of pH in the pore solutions of slag cement pastes at early age based on the 3D numerical cement hydration model HYMOSTRUC3D.

HYMOSTRUC3D was used to simulate the hydration of slag cements. Taylor’s method was used to predict the [Na+] and the [K+]. The thermodynamic equilibriums of the CH and the gypsum in the slag cement pastes were used to predict the [Ca2+], the [SO4 2-] and the [OH-]. The development of pH in the pore solutions of the slag cement pastes was simulated based on the [OH-].

The results of simulation indicate that the [Na+] and the [K+] in the pore solutions of slag cement pastes predicted by this study are in good agreement with the experimental results. However the accuracy of the simulation of [Ca2+] and [SO4 2-] is relatively low. The simulated pH in the pore solutions of slag cement pastes is in good agreement with that of experiment before 10 hours and after 72 hours.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00