Estimation Models of Autogenous Shrinkage Based on Electrical Resistivity Method and Capillary Tension Theory for Cement Pastes at Early Age
Author(s): Jiayin Tao, Xiaosheng Wei, Lei Fu
Paper category: Proceedings
Book title: 3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): Changwen Miao, Wei Sun, Jiaping Liu, Huisu Chen, Guang Ye and Klaas van Breugel
Publisher: RILEM Publications SARL
Publication year: 2016
Total Pages : 10
Language : English
Abstract: Autogenous shrinkage and electrical resistivity were measured for plain cement paste with water to cement ratios(W/C) of 0.3, 0.35 and 0.4 during the first 3 days. A general function applied to calculate hydration degree was adopted to fit the electrical resistivity development curves with two parameters, which were also linearly correlated to autogenous shrinkage after hydration for 24h. Thus a simple linear estimation model based on electrical resistivity and an exponential function consisting of three parameters based on the degree of hydration were established to estimate the early-period autogenous shrinkage development.
Based on capillary tension theory and Powers’ law, the parameters of exponential model for electrical resistivity was introduced to calculate the autogenous shrinkage approximately after mixing for 24 hours. The estimation results were consistent with the experimental results.
All the estimation models can reveal the inherent relations among electrical resistivity, hydration degree and autogenous shrinkage.
Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00