Effects of high temperatures on the splitting tensile strength and gamma ray shielding performance of radiation shielding concrete

Luo, Lincheng; Chen, Zhenfu; Tao, Qiuwang; Xie, Liping; Jin, Dan; Li, Zhujing; Du, Debin

doi:10.1016/j.conbuildmat.2022.127953

Cited by 30 publications

(8 citation statements)

References 35 publications

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“…This change can be described as linear especially for concretes containing polypropylene fibres. In the case of HPC without polypropylene fibres, a higher change is only observed when the specimens are heated above 200 • C. When ultrasonic waves pass through concrete and run into defects (microand macro-cracks), their original propagation path and mode of propagation is affected, which is usually accompanied by a decrease in the ultrasonic pulse velocity [43]. In the case of HPCs, due to the lack of polypropylene fibres, the first micro-cracks are already formed in the temperature range of 20-200 • C and, in fact, beyond 100 • C, i.e., at the point at which water changes from a liquid to a gas.…”

Section: Discussionmentioning

confidence: 99%

“…All cylinders were weighed on an electronic balance with an accuracy of 0.02 g. An ultrasound test was also used as part of the internal structure assessment. Ultrasound testing makes it possible to determine the degree of deterioration and the strength of the concrete [43]. A pundit lab proceq device (Schwerzenbach, Switzerland, 2013) was used for the study.…”

Section: Testing Of Concretesmentioning

confidence: 99%

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Change of the Structural Properties of High-Performance Concretes Subjected to Thermal Effects

et al. 2022

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The paper refers to studies of the structure of high-performance concrete with polypropylene fibre at different dosages. The authors see a research gap in the study of the effect of adding polypropylene fibre on the parameters of concrete exposed to high temperatures. The study takes into account the thermal effect—groups of samples were heated to 200 °C, 400 °C and 600 °C. The authors carried out basic tests to describe the changes in density, ultrasonic tests, uniaxial compression strength tests and tensile tests by splitting. The positive effect of polypropylene fibres is mainly observed between 20 °C and 200 °C. The melting of polypropylene fibres causes a delay in the development of micro-cracks in the structure of these concretes compared to HPC. Adding polypropylene fibres to the mixtures also increased the speed of ultrasonic wave propagation in the medium. The research was deepened with tomographic imaging. A description of the splitting surface was carried out. The results of tensile by splitting tests clearly show an increase in the relative failure area for unheated concretes in proportion to the number of fibres used. Changes in splitting surfaces under the influence of temperature are graphically illustrated. Furthermore, differences in the samples under the influence of heating at high temperatures are presented. Finally, the porosity development of all sample groups before and after heating at all temperatures is described.

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Section: Discussionmentioning

confidence: 99%

Section: Testing Of Concretesmentioning

confidence: 99%

Change of the Structural Properties of High-Performance Concretes Subjected to Thermal Effects

et al. 2022

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“…Over the course of its operational lifespan, RSC may be exposed to high temperatures, so the determination of heat distribution and heat effect or thermal stress is a significant aspect of the shielding design [35]. Heavy concretes with aggregates of ilmenite, magnetite and hematite have good phase stability when exposed to high temperatures [36][37][38]. The reason why the mechanical and shielding properties of heavy concrete deteriorate is mainly due to the loss of crystalline water, the development of internal cracks [39] and severe bursting phenomena [36,37,40].…”

Section: Introductionmentioning

confidence: 99%

Effect of High Temperatures on Mechanical and Shielding Properties of Lead–Zinc Tailings Concrete for Radiation Protection

Wang,

Chen,

Tao

et al. 2024

Buildings

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Due to the high prices, the popularity of radiation shielding concrete (RSC) has been greatly limited. To solve this, this research reused the lead–zinc tailings (LZT) as a fine aggregate replacement ranging from 0% to 60% for the RSC. The results revealed that the RSC containing 30% LZT presented better workability and achieved 95.84% of the compressive strength and 98.49% of the linear attenuation coefficient of the RSC, and reached the highest splitting tensile strength values, which increased by 4.43%. Meanwhile, after the heat treatments, there were favorable correlations between the relative velocity and relative strength, as well as between the damage index and the relative linear attenuation coefficient, which could accurately reflect the degradation of not only the mechanical but also the shielding properties. Considering the temperature and shielding thickness, the reuse of LZT can bring considerable economic and environmental benefits.

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“…Additionally, in the service life, radiation shielding concrete suffers from force, heat, or combined effects, which cause serious deterioration in its mechanical properties and radiation shielding performance [ 2 , 16 , 17 ]. Therefore, understanding thermal distribution, thermal effects, and thermal stress on radiation shielding concrete has become a significant aspect affecting its design [ 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnetite Concrete on Splitting Tensile Strength and Gamma Ray Shielding Performance Exposed to Repeated Heating at High Temperature

et al. 2023

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Radiation shielding concrete is one of the most used materials in the construction of nuclear power plants and will be subjected to high temperatures for a long time during its service life. This study aims to investigate deterioration of radiation shielding concrete with multiple heating at different temperatures. A microwave oven was used as a heating apparatus to simulate irradiation, and 200, 300, and 400 °C were selected as experimental cycle temperatures. The apparent characteristics, mass loss, splitting tensile strength, and gamma ray shielding properties of the commonly used magnetite shielding concrete were investigated. The results showed that the splitting tensile strength and gamma shielding performance of concrete were dramatically reduced at first heating. Then, as the heating times increased, the splitting tensile strength and gamma shielding properties of the concrete continued to deteriorate, and the higher the increase in heating temperature, the more severe the deterioration of the concrete. During the service period of radiation shielded concrete, the magnitude of temperature under the service conditions will affect the deterioration degree of concrete, and the continuous change of temperature will continuously lead to the deterioration of concrete.

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Effects of high temperatures on the splitting tensile strength and gamma ray shielding performance of radiation shielding concrete

Cited by 30 publications

References 35 publications

Change of the Structural Properties of High-Performance Concretes Subjected to Thermal Effects

Change of the Structural Properties of High-Performance Concretes Subjected to Thermal Effects

Effect of High Temperatures on Mechanical and Shielding Properties of Lead–Zinc Tailings Concrete for Radiation Protection

Effect of Magnetite Concrete on Splitting Tensile Strength and Gamma Ray Shielding Performance Exposed to Repeated Heating at High Temperature

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