The prediction model of concrete carbonation depth based on cement hydration simulation

Author(s): B. Li, X. Y. Jin, Y. Tian, N. G. Jin
Paper category: Proceedings
Book title: Proceedings of the Seventh International Conference on Concrete under Severe Conditions – Environment and Loading
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 602-615
Total Pages: 14
Language : English

Abstract: A computer simulation method for cement hydration with periodic boundary conditions is presented. The basic principle of the hydration simulation of a single cement grain is described and three parameters are introduced to quantify the interference effect between cement grains during the process of hydration. A method for computing the degree of hydration is proposed based on the simulated microstructure of cement paste. On the basis of hydration simulation, a simple model for predicting the concrete carbonation depth is established. In this scheme, concrete is modelled as a multiphase composite material, composed of unhydrated cement, hydration products, capillary pores and aggregate. The relationship between the degree of hydration and the volume fractions of individual phases is used to calculate the concrete carbonation depth. To determine the parameters in the model according to the cement mineral constituent, w/c, particle size distribution can make the simulation close to the truth. The concrete with water to cement ratio of 0.53 is used to validate the model proposed with the relative error 12.8% between the test results and those obtained by the model. It showed that the concrete carbonation model based on the cement hydration simulation can simplify the mathematical complexity of the theoretical prediction to predict the carbonation depth efficiently and can conveniently be used by practical engineers.

Online publication : 2013
Publication type : full_text
Public price (Euros) : 0.00