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

WANG Jiangbo; DING Junsheng; WANG Xiaodong; DU Zhonghua; GAO Guangfa

doi:10.11883/bzycj-2021-0147

Volume 42 Issue 2

Feb. 2022

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WANG Jiangbo, DING Junsheng, WANG Xiaodong, DU Zhonghua, GAO Guangfa. Effect of coarse aggregate size on the dynamic compression behavior of concrete[J]. Explosion And Shock Waves, 2022, 42(2): 023101. doi: 10.11883/bzycj-2021-0147

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

doi: 10.11883/bzycj-2021-0147

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

Received Date: 2021-04-20
Rev Recd Date: 2021-07-13

Available Online: 2021-12-20

Publish Date: 2022-02-28

Abstract

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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References

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