%0 Journal Article
%A CHEN Rong-fei
%A CHEN Chang-li
%T Improved Formula for Calculating Parameters of Arctangent Curve Model for Autogenous Volume Deformation of MgO-admixed Concrete
%D 2020
%R 10.11988/ckyyb.2019070464
%J Journal of Yangtze River Scientific Research Institute
%P 161-164
%V 37
%N 10
%X The formula for calculating parameters of arctangent curve model for the autogenous volume deformation of MgO-admixed concrete is improved based on the new findings and applications of MgO-admixed concrete in recent years. The eigenvalue (<i>ε</i><sub>90</sub>) of the autogenous volume expansive deformation of MgO-admixed concrete at age 90 d is revised as that at age 180 d (<i>ε</i><sub>180</sub>). The autogenous volume deformation of MgO-admixed concrete calculated by the improved formula is closer to the measured value after the age of 150 d,with a deviation rate around 2%-7% or even less than 1% and the ultimate expansion reducing by 4×10<sup>-6</sup>-7×10<sup>-6</sup>, which is also closer to the reality.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.2019070464