粗骨料粒径对混凝土动态压缩行为的影响研究

王江波; 丁俊升; 王晓东; 杜忠华; 高光发

doi:10.11883/bzycj-2021-0147

粗骨料粒径对混凝土动态压缩行为的影响研究

doi: 10.11883/bzycj-2021-0147

南京理工大学机械工程学院, 江苏南京 210094

基金项目: 国家自然科学基金（11772160，11472008，11802141）

详细信息

作者简介:
王江波（1993－　），男，博士研究生，wjbo1993@163.com

通讯作者:
高光发（1980－　），男，博士，教授，gfgao@ustc.edu.cn

中图分类号: O347.3
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- 文章访问数: 377
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- 被引次数: 0
出版历程
- 收稿日期: 2021-04-20
- 修回日期: 2021-07-13
- 网络出版日期: 2021-12-20
- 刊出日期: 2022-02-28

Effect of coarse aggregate size on the dynamic compression behavior of concrete

College of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

摘要

摘要: 粗骨料作为混凝土材料组成最主要的部分，对混凝土力学性能和破坏模式有着很重要的影响。为了研究粗骨料平均粒径对混凝土动态力学性能的影响规律，针对不同平均粗骨料平均粒径（6、12、24 mm）的混凝土和砂浆材料进行了一系列SHPB试验，得到了不同应变率下各试件的应力-应变曲线，并对每种材料的动态增长因子（dynamic increase factor，DIF）与应变率的对数进行了线性拟合。结果表明：砂浆和混凝土材料的抗压强度具有明显的应变率效应，其动态抗压强度随着应变率的增加而逐渐增大，应力-应变曲线呈现相似的变化趋势；在相同的动态应变率条件下，平均粗骨料粒径为12 mm的混凝土的动态抗压强度最大，这与准静态条件下砂浆抗压强度最大截然不同；不同粗骨料粒径混凝土材料的应变率强化系数均大于砂浆材料，且随着粗骨料无量纲尺寸的增大，混凝土材料的应变率强化因子呈现先增大后减小的趋势。
- 粗骨料平均粒径 /
- 动态压缩 /
- 混凝土 /
- 应变率强化因子 /
- SHPB
Abstract: As the most important part of concrete material, coarse aggregate has a very important influence on the mechanical properties and failure mode of concrete. In order to study the effect of the coarse aggregate average size on the dynamic mechanical properties of concrete, a series of SHPB experiments were carried out for concrete and mortar materials with different average particle sizes (6 mm, 12 mm and 24 mm) of coarse aggregate. A dual-pulse shaper was used in the tests for dynamic stress equilibrium and constant strain rate loading. Moreover, the dynamic stress equilibrium in the test specimen was checked, and it is considered that the test data are valid when the dynamic imbalance factor is less than 5%. The stress-strain curves of the specimens under different strain rates were obtained, and the dynamic increase factor (DIF) of each material was linearly fitted with the logarithm of the strain rate. The results indicate that the compressive strength of the mortar and the concrete has an obvious strain rate effect, the dynamic compressive strength increases gradually with the strain rate, and the stress-strain curves show a similar trend. Under the same dynamic strain rate condition, the dynamic compressive strength of the concrete with an average coarse aggregate size of 12 mm is the highest, which is quite different from the maximum compressive strength of the mortar under quasi-static conditions. The CEB and other models are inapplicable to the relationship between the DIF and the strain rate because they do not consider the effect of the coarse aggregate size found in this study. Therefore, the specimen’s dynamic DIF and the logarithm of strain rate are fitted by Bischoff's model in the paper. The strain rate strengthening coefficient of concretes with different coarse aggregate sizes is larger than that of the mortar. With the increase of the coarse aggregate dimensionless size, the strain rate strengthening factor of the concrete increases at first and then decreases.
- average size of coarse aggregate /
- dynamic compression /
- concrete /
- strain rate strengthening factor /
- SHPB

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图 1 准静态压缩试验

Figure 1. Quasi-static compression test

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图 2 准静态压缩下的应力-应变曲线

Figure 2. Quasi-static compressive stress-strain curves

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图 3 SHPB试验装置

Figure 3. Schematic of the SHPB test system

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图 4 试验时整形器与试件位置图

Figure 4. Position of the pulse shaper and the specimen in the experiment

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图 5 典型试件的试验结果

Figure 5. Typical test results of specimens

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图 6 试件的动态应力平衡状态

Figure 6. Dynamic stress equilibrium in the specimens

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图 7 不同应变率下试件的动态应力-应变曲线

Figure 7. Dynamic stress-strain curves of specimens at various strain rates

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图 8 不同试件压缩强度与应变率的关系图

Figure 8. Relationship between the compressive strength and the strain rate of different specimens

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图 9 试验动态增长因子与不同模型对比

Figure 9. Comparison of DIFs with different models

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图 10 不同骨料粒径的混凝土动态增长因子与应变率关系

Figure 10. Fitting curves of the dynamic increase factors and the strain rate for different aggregate sizes

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图 11 无量纲粗骨料尺寸与应变率强化因子的关系

Figure 11. Relationship between the dimensionless coarse aggregate size and the strain rate strengthening factor

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表 1 不同材料试样的配比

Table 1. Mix proportion of different grades of mortar and concrete

试件	w(水泥)/（kg·m⁻³）	w(砂子)/（kg·m⁻³）	w(粗骨料)/（kg·m⁻³）	w(矿粉)（kg·m⁻³）	w(水)/（kg·m⁻³）	w(减水剂)/（kg·m⁻³）
M60	714	1000		22	223	2.22
C60	547	767	897	17	171	1.70

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表 2 SHPB装置中部件的主要参数

Table 2. Specifications of the SHPB experimental system

部件	材质	几何参数		物理参数
部件	材质	直径/mm	长度/mm	${E_{\text{b}}}$/GPa	${\rho _{\text{b}}}$/(g·cm⁻³)	${\nu _{\text{b}}}$	$ {c_{\text{b}}} $/(m·s⁻¹)
撞击杆	40Cr钢	80	500/1000	210	7.85	0.22	5210
入射杆	40Cr钢	80	6000	210	7.85	0.22	5210
透射杆	40Cr钢	80	4000	210	7.85	0.22	5210

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表 3 不同试样的动态增长因子在公式中的拟合结果

Table 3. Fitting results of dynamic increace factors of different samples in the formula

试样	A	$ {\dot \varepsilon _{\text{s}}} $/s^-1	R²
M60	0.94	30	0.998
C60-G6	1.45	30	0.996
C60-G12	2.13	30	0.995
C60-G24	1.08	30	0.996

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