JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2020, Vol. 37 ›› Issue (10): 161-164.DOI: 10.11988/ckyyb.2019070464

• HYDRAULIC STRUCTURE AND MATERIAL • Previous Articles     Next Articles

Improved Formula for Calculating Parameters of Arctangent Curve Model for Autogenous Volume Deformation of MgO-admixed Concrete

CHEN Rong-fei, CHEN Chang-li   

  1. School of Materials and Architecture Engineering, Guizhou Normal University, Guiyang 550025, China
  • Received:2019-06-19 Revised:2019-08-10 Online:2020-10-01 Published:2020-10-29

Abstract: 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 (ε90) of the autogenous volume expansive deformation of MgO-admixed concrete at age 90 d is revised as that at age 180 d (ε180). 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 4×10-6-7×10-6, which is also closer to the reality.

Key words: autogenous volume deformation, arctangent curve model, parameter calculation formula, improvement, MgO-admixed concrete

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