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超高性能混凝土的收缩性能及收缩预测模型研究
Study on Shrinkage Performance and Shrinkage Prediction Model of Ultra-High Performance Concrete
2023年第5期
钢纤维;超高性能混凝土;收缩性能;收缩预测模型
Steel fiber; Ultra-high performance concrete(UHPC); Shrinkage performance; Shrinkage prediction model
2023年第5期
10.19761/j.1000-4637.2023.05.050.05
国家自然科学基金面上项目(52178203)。
徐 怡,陈阳杰,谭 昕,李梦翔,康 璇,童松如,茅俊涛
河海大学 力学与材料学院,江苏 南京 211100

徐 怡,陈阳杰,谭 昕,李梦翔,康 璇,童松如,茅俊涛

徐怡,陈阳杰,谭昕,等.超高性能混凝土的收缩性能及收缩预测模型研究[J].混凝土与水泥制品,2023(5):50-54.

XU Y,CHEN Y J,TAN X,et al.Study on Shrinkage Performance and Shrinkage Prediction Model of Ultra-High Performance Concrete[J].China Concrete and Cement Product,2023(5):50-54.

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 摘   要:试验研究了钢纤维掺量(0、1%、2%)对超高性能混凝土(UHPC)收缩性能的影响,对比分析了5种常用的混凝土收缩预测模型对UHPC的适用性,并基于试验数据建立了适用于UHPC的收缩预测模型。结果表明:掺钢纤维UHPC的收缩应变低于未掺钢纤维的对比组,且钢纤维掺量越大,对UHPC的减缩效果越显著;5种常用的混凝土收缩预测模型对UHPC的适用性较低,其中,ACI 209(92)模型高估了UHPC的40 d后收缩应变,B3模型、CEB-FIP 90模型和中国建科院模型低估了UHPC的收缩应变,GL2000模型对90 d龄期时的收缩应变预测值与试验值相对较为接近;建立的指数函数形式的UHPC收缩应变计算模型的精度较高。 Abstract: The influence of steel fiber content(0, 1%, 2%) on the shrinkage performance of ultra-high performance concrete(UHPC) was studied through experiments. The applicability of five commonly used concrete shrinkage prediction models to UHPC was compared and analyzed, and a shrinkage prediction model suitable for UHPC was established based on the test datas. The results show that the shrinkage strain of UHPC mixed with steel fiber is lower than that of comparison group without steel fiber, and the greater the content of steel fiber, the more significant the shrinkage reduction effect of UHPC. The applicability of five commonly used concrete shrinkage prediction models to UHPC is low. ACI 209(92) model overestimates the shrinkage strain of UHPC after 40 days, B3 model, CEB-FIP 90 model and China Academy of Building Research model underestimate the shrinkage strain of UHPC, and GL2000 model predictes the shrinkage strain at the age of 90 days relatively close to the test value. The calculation model of UHPC shrinkage strain in the form of exponential function has high accuracy.
英文名 : Study on Shrinkage Performance and Shrinkage Prediction Model of Ultra-High Performance Concrete
刊期 : 2023年第5期
关键词 : 钢纤维;超高性能混凝土;收缩性能;收缩预测模型
Key words : Steel fiber; Ultra-high performance concrete(UHPC); Shrinkage performance; Shrinkage prediction model
刊期 : 2023年第5期
DOI : 10.19761/j.1000-4637.2023.05.050.05
文章编号 :
基金项目 : 国家自然科学基金面上项目(52178203)。
作者 : 徐 怡,陈阳杰,谭 昕,李梦翔,康 璇,童松如,茅俊涛
单位 : 河海大学 力学与材料学院,江苏 南京 211100

徐 怡,陈阳杰,谭 昕,李梦翔,康 璇,童松如,茅俊涛

徐怡,陈阳杰,谭昕,等.超高性能混凝土的收缩性能及收缩预测模型研究[J].混凝土与水泥制品,2023(5):50-54.

XU Y,CHEN Y J,TAN X,et al.Study on Shrinkage Performance and Shrinkage Prediction Model of Ultra-High Performance Concrete[J].China Concrete and Cement Product,2023(5):50-54.

摘要
参数
结论
参考文献
引用本文

 摘   要:试验研究了钢纤维掺量(0、1%、2%)对超高性能混凝土(UHPC)收缩性能的影响,对比分析了5种常用的混凝土收缩预测模型对UHPC的适用性,并基于试验数据建立了适用于UHPC的收缩预测模型。结果表明:掺钢纤维UHPC的收缩应变低于未掺钢纤维的对比组,且钢纤维掺量越大,对UHPC的减缩效果越显著;5种常用的混凝土收缩预测模型对UHPC的适用性较低,其中,ACI 209(92)模型高估了UHPC的40 d后收缩应变,B3模型、CEB-FIP 90模型和中国建科院模型低估了UHPC的收缩应变,GL2000模型对90 d龄期时的收缩应变预测值与试验值相对较为接近;建立的指数函数形式的UHPC收缩应变计算模型的精度较高。

Abstract: The influence of steel fiber content(0, 1%, 2%) on the shrinkage performance of ultra-high performance concrete(UHPC) was studied through experiments. The applicability of five commonly used concrete shrinkage prediction models to UHPC was compared and analyzed, and a shrinkage prediction model suitable for UHPC was established based on the test datas. The results show that the shrinkage strain of UHPC mixed with steel fiber is lower than that of comparison group without steel fiber, and the greater the content of steel fiber, the more significant the shrinkage reduction effect of UHPC. The applicability of five commonly used concrete shrinkage prediction models to UHPC is low. ACI 209(92) model overestimates the shrinkage strain of UHPC after 40 days, B3 model, CEB-FIP 90 model and China Academy of Building Research model underestimate the shrinkage strain of UHPC, and GL2000 model predictes the shrinkage strain at the age of 90 days relatively close to the test value. The calculation model of UHPC shrinkage strain in the form of exponential function has high accuracy.

关键词:
the
uhpc
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shrinkage
模型
收缩
model
strain
应变
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(1)UHPC的抗压强度随着钢纤维掺量的增加而有所提高,与未掺钢纤维的对比组试件相比,掺1%、2%钢纤维UHPC的28 d抗压强度分别提高了17.6%、33.5%。
(2)UHPC的收缩应变随着龄期的延长而增大,早期收缩较大,后期收缩趋于稳定。随着钢纤维掺量的增加,UHPC的收缩应变减小,说明在UHPC中掺入适量钢纤维可有效控制UHPC的收缩变形。
(3)ACI 209(92)模型高估了龄期40 d之后UHPC的收缩应变,B3模型、CEB-FIP 90模型和中国建科院模型低估了UHPC的收缩应变,GL2000模型的90 d收缩应变预测值相对较接近于试验值。总体而言,常用的普通混凝土收缩预测模型对UHPC的适用性较低。
(4)基于普通混凝土收缩预测模型的形式和UHPC收缩性能的影响因素建立的UHPC收缩预测模型的精度较高,可为相关研究提供参考。
(5)值得注意的是,由于本文试验数据较少,所建立的UHPC收缩预测模型对不含粗骨料UHPC的普适性还有待进一步验证。

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,陈阳杰,谭昕,等.超高性能混凝土的收缩性能及收缩预测模型研究[J].混凝土与水泥制品,2023(5):50-54.

XU Y,CHEN Y J,TAN X,et al.Study on Shrinkage Performance and Shrinkage Prediction Model of Ultra-High Performance Concrete[J].China Concrete and Cement Product,2023(5):50-54.

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