院报 ›› 2020, Vol. 37 ›› Issue (10): 161-164.DOI: 10.11988/ckyyb.2019070464

• 水工结构与材料 • 上一篇    下一篇

外掺MgO混凝土自生体积变形反正切曲线模型参数计算式的改进

陈荣妃, 陈昌礼   

  1. 贵州师范大学 材料与建筑工程学院,贵阳 550025
  • 收稿日期:2019-06-19 修回日期:2019-08-10 出版日期:2020-10-01 发布日期:2020-10-29
  • 通讯作者: 陈昌礼(1966-),男,贵州正安人,教授,硕士,主要从事水工材料研究。E-mail:ccl@gznu.edu.cn
  • 作者简介:陈荣妃(1987-),女,广西北海人,讲师,硕士,主要从事水工材料研究。E-mail:CRFei87@163.com
  • 基金资助:
    国家自然科学基金项目(51869005);贵州省科技计划项目(黔科合平台人才[2018]5769号)

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

摘要: 根据近年来MgO混凝土研究与应用的新发现,对外掺MgO混凝土自生体积变形反正切曲线模型的参数计算式进行改进,将外掺MgO混凝土在龄期90 d的自生体积膨胀量特征值ε90改进为以混凝土在龄期180 d的自生体积膨胀量ε180为特征值。结果表明:利用改进后的参数计算式计算的外掺MgO混凝土自生体积变形,在龄期150 d以后的拟合值与实测值更加接近,偏差率一般为2%~7%,甚至<1%;极限膨胀量减少4×10-6~7×10-6,与实际也更加接近。改进的计算式可供广大工程技术人员和科研人员参考。

关键词: 自生体积变形, 反正切曲线模型, 参数计算式, 改进, 外掺MgO混凝土

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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