[1]黄嘉钰,刘元珍,高宇璇,等.再生粗骨料取代率对再生保温混凝土徐变影响的影响[J].郑州大学学报(工学版),2021,42(5):68-73.[doi:10.13705/j.issn.1671-6833.2021.05.001]
　Huang Jiayu,Liu Yuanzhen,Gao Yuxuan,et al.Study on Influence of Recycled Coarse Aggregate Replacement Rate on Creep of Recycled Thermal Insulation Concrete[J].Journal of Zhengzhou University (Engineering Science),2021,42(5):68-73.[doi:10.13705/j.issn.1671-6833.2021.05.001]
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再生粗骨料取代率对再生保温混凝土徐变影响的影响()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
42
期数:
2021年5期
页码:
68-73
栏目:
出版日期:
2021-09-10

文章信息/Info

Title:
Study on Influence of Recycled Coarse Aggregate Replacement Rate on Creep of Recycled Thermal Insulation Concrete
作者:
黄嘉钰,刘元珍,高宇璇,王朝旭
太原理工大学 土木工程学院，山西 太原 030024
Author(s):
Huang Jiayu; Liu Yuanzhen; Gao Yuxuan; Wang Zhaoxu
College of Civil Engineering， Taiyuan University of Technology， Taiyuan 030024， China
关键词:
Keywords:
recycled coarse aggregate replacement rate;  elastic modulus;  creep;  creep coefficient;  modified model
DOI:
10.13705/j.issn.1671-6833.2021.05.001
文献标志码:
A
摘要:
通过在恒定的温度和湿度条件下开展再生保温混凝土的徐变试验,研究了再生粗骨料取代率发生变化时,再生保温混凝土的徐变值、徐变系数以及弹性模量的不同发展变化,并提出了一种基于ACI-FIP (1990)模型的新修正模型,此模型针对再生粗骨料取代率改变时再生保温混凝土的徐变系数发展状态进行了较为准确的预测。 试验结果表明:再生保温混凝土的弹性模量会因再生粗骨料取代率的提高而出现降低现象,徐变值和徐变系数则显著增大,与保温混凝土相比,再生粗骨料取代率为 50%和100%的再生保温混凝土弹性模量分别降低了 10%和 12%,180 d 时再生粗骨料取代率为 50%和 100%的再生保温混凝土徐变值分别增大了 6%和 17%,徐变系数则分别增大了 12%和 31%；将修正后的徐变模型预测结果与试验结果进行对比,通过线性回归分析发现,再生保温混凝土模型的线性回归系数( R2)均处于 0.91~0.93,表明该模型有较好的拟合度,可以较好地预测混凝土的徐变系数因再生粗骨料的改变而发生的变化情况。
Abstract:
Based on the creep test of recycled thermal insulation concrete under constant temperature and humidity, this research studies the different development of creep value, creep coefficient and elastic modulus of recycled thermal insulation concrete when the replacement rate of recycled coarse aggregate changes. Based on the ACI-FIP (1990) model, a new modified model is proposed to predict accurately the development state of creep coefficient of recycled thermal insulation concrete when the replacement rate of recycled coarse aggregate is different. Experiments showed that with the increase of the replacement rate of recycled coarse aggregate, the elastic modulus of recycled thermal insulation concrete decreased, and the creep value and creep coefficient increased significantly. Compared with thermal insulation concrete, the elastic modulus of recycled thermal insulation concrete with recycled coarse aggregate replacement ratios of 50% and 100% decreased by 10% and 12%, respectively. At 180 days, the creep of recycled thermal insulation concrete with recycled coarse aggregate replacement ratios of 50% and 100% increased by 6% and 17%, and the creep coefficient increased by 12% and 31%, respectively. Comparing the predicted results of the modified creep model with the test results, through linear regression analysis, it is found that the linear regression coefficients (R2) of recycled thermal insulation concrete models are all between 0.91 and 0.93, indicating the model has a good degree of fit and it can better predict the change of concrete creep coefficient with variation of recycled coarse aggregate replacement ratios.

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更新日期/Last Update: 2021-10-11