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浙江大学学报(工学版)
浙江大学学报(工学版)  2021, Vol. 55 Issue (5): 999-1009    DOI: 10.3785/j.issn.1008-973X.2021.05.021
土木工程、水利工程     
活性粉末混凝土冲击压缩性能及本构关系
谢磊(),李庆华*(),徐世烺
浙江大学 建筑工程学院，浙江 杭州 310058
Dynamic compressive properties and constitutive model of reactive powder concrete
Lei XIE(),Qing-hua LI*(),Shi-lang XU
School of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
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摘要：

为了克服传统活性粉末混凝土（RPC）须高温蒸养的缺点，采用粒化高炉矿渣代替部分水泥制备出免蒸养RPC，利用直径为80 mm的霍普金森压杆试验系统（SHPB）对免蒸养RPC进行冲击压缩试验研究，探究率效应对免蒸养RPC动态力学性能的影响规律，建立动态本构模型. 结果表明：在10~290 $ {{\rm{s}}^{ - 1}}$的应变率范围内，免蒸养RPC的峰值应力、峰值应变和冲击韧性表现出明显的率敏感性，而弹性模量在不同应变率下基本保持不变. 改进型Z-W-T黏弹性本构模型和基于Weibull分布的模型均能对免蒸养RPC的动态应力-应变曲线进行较好的描述，基于Weibull分布的模型所含参数相对较少，根据模型中各参数与应变率之间的关系可以对不同应变率下的应力-应变曲线进行预测.
关键词： 活性粉末混凝土（RPC）;  霍普金森压杆试验系统（SHPB）;  应变率效应;  冲击压缩性能;  动态本构模型    
Abstract:

The granulated blast furnace slag was used to replace part of cement to prepare steam free reactive powder concrete (RPC), in order to overcome the disadvantage of traditional reactive powder concrete (RPC) that needs high temperature steam curing. The impact compression experiment of steam free RPC was carried out by using split Hopkinson pressure bar system (SHPB) with diameter of 80 mm, the influence of rate effect on the dynamic mechanical properties of steam free RPC was explored at the same time, and the dynamic constitutive model was established based on the experimental results. Results show that in the strain rate range of 10~290 $ {{\rm{s}}^{ - 1}}$, the peak stress, the peak strain and the impact toughness of the steam free RPC show obvious rate sensitivity, while the elastic modulus remains unchanged under different strain rates. On the aspect of constitutive model, both the improved Z-W-T viscoelastic constitutive model and the Weibull distribution-based model can well describe the dynamic stress-strain curve of steam free RPC. Due to the relatively fewer parameters Weibull distribution-based model contains, the stress-strain curve under different strain rates can be predicted based on the known relationship between parameters and strain rate in the model.
Key words: reactive powder concrete (RPC)    split Hopkinson pressure bar system (SHPB)    strain rate effect    dynamic compressive property    dynamic constitutive model
收稿日期: 2020-05-14 出版日期: 2021-06-10
CLC:  TU 528.572  
基金资助: 国家自然科学基金资助项目（51622811）
通讯作者: 李庆华     E-mail: 21712220@zju.edu.cn;liqinghua@zju.edu.cn
作者简介: 谢磊（1995―），男，博士生，从事水泥基材料动态力学性能研究. orcid.org/0000-0002-4613-5846. E-mail： 21712220@zju.edu.cn
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引用本文:

谢磊,李庆华,徐世烺. 活性粉末混凝土冲击压缩性能及本构关系[J]. 浙江大学学报(工学版), 2021, 55(5): 999-1009.

Lei XIE,Qing-hua LI,Shi-lang XU. Dynamic compressive properties and constitutive model of reactive powder concrete. Journal of ZheJiang University (Engineering Science), 2021, 55(5): 999-1009.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2021.05.021    或    http://www.zjujournals.com/eng/CN/Y2021/V55/I5/999

图 1  动态测试试样外貌
图 2  霍普金森压杆装置示意图
图 3  不同冲击气压下的平均应力-应变曲线
图 4  峰值应力及DIF与应变率的关系
图 5  峰值应变与应变率的关系
图 6  不同类型超高性能混凝土材料的耗能对比
图 7  不同冲击气压下各阶段占比柱状图
图 8  非线性黏弹性本构模型
图 9  基于改进型Z-W-T模型的理论曲线与试验应力-应变曲线的对比
$ \dot{\varepsilon } $/ ${{\rm{s}}^{ - 1}}$ ${E^{'}}$/GPa ${E_2}$/GPa ${\theta _2}$/μs $m$ $n/ {10^{ - 3}}$ ${\varepsilon _{\rm{th}}}/{10^{ - 3}}$ $k$
10.57 287.360 ?174.1000 ?331.3900 0.8290 6.100 1.550 165.110
92.57 11.464 144.6740 9.7676 1.3390 1.030 2.247 41.889
140.10 ?6.563 146.8910 11.4730 0.9355 11.777 2.016 40.737
175.60 ?55.573 187.1640 15.8260 0.3990 106.628 2.205 174.509
200.27 ?50.976 178.6470 14.8670 0.4050 104.193 2.331 165.410
265.80 ?267.832 394.8950 34.2050 0.3240 88.225 3.240 176.505
289.43 ?112.749 244.3337 17.3725 0.3770 91.451 3.402 174.322
表 1  Z-W-T模型拟合参数
图 10  不同应变率下损伤随应变的变化曲线
图 11  不同应变率下的弹性模量
图 12  基于改进型Weibull分布的理论曲线与试验应力-应变曲线的对比
图 13  活性粉末混凝土动态应力-应变关系的预测结果与试验结果对比
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