Optimization of reactive powder concrete by means of barite aggregate for both neutrons and gamma rays
Küçük Resim Yok
Tarih
2018
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
High performance concrete has been often preferred in special engineering structures and in challenging composites products. Researchers have recently focused on the radiation shielding characteristics of these type concrete mixtures due to rising nuclear industry in the developing world. In the study, performance of reactive powder concrete was researched with regard to gamma-ray and neutron attenuation when its normal weight aggregate replaced with heavyweight aggregate (barite). For this purpose, reactive powder concrete mixtures were prepared 100% quartz aggregate, 100% barite aggregate and their blending 50–50%, by volume. Some physical and mechanical characteristics such as density, compressive strength, fracture energy, flexural strength and modulus of elasticity of the mixtures were determined. Gamma-ray attenuation coefficients and transmission thickness values were theoretically established for commonly known gamma energies (661.7, 1173.2 and 1332.5 keV). Optimization of the reactive powder mixtures was performed for both neutron and gamma-ray attenuation at 8 MeV. As a result, barite significantly increased the gamma-ray attenuation coefficients of reactive powder concrete. The mechanical performance of reactive powder concrete, however, was markedly reduced as a result of barite substitution. Replacement of quartz by barite aggregate has a more adverse impact on flexural strength than that of compressive strength. A mix that contains 40% barite aggregate of total aggregate volume was found as an optimum RPC mixture for simultaneously shielding neutrons and gamma rays. © 2018 Elsevier Ltd
Açıklama
Anahtar Kelimeler
Barite proportion, Mechanical properties, Optimization, Reactive powder concrete, Simultaneously shielding neutrons and gamma rays, Aggregates, Barite, Bending strength, Blending, Compressive strength, Concrete mixtures, Concrete products, Developing countries, Electromagnetic wave attenuation, High performance concrete, Mechanical properties, Mixtures, Neutrons, Nuclear industry, Optimization, Quartz, Radiation shielding, Engineering structures, Gamma-ray attenuation, Gamma-ray attenuation coefficients, Mechanical characteristics, Mechanical performance, Neutron attenuation, Reactive powder concrete, Shielding characteristic, Gamma rays, Barite proportion, Mechanical properties, Optimization, Reactive powder concrete, Simultaneously shielding neutrons and gamma rays, Aggregates, Barite, Bending strength, Blending, Compressive strength, Concrete mixtures, Concrete products, Developing countries, Electromagnetic wave attenuation, High performance concrete, Mechanical properties, Mixtures, Neutrons, Nuclear industry, Optimization, Quartz, Radiation shielding, Engineering structures, Gamma-ray attenuation, Gamma-ray attenuation coefficients, Mechanical characteristics, Mechanical performance, Neutron attenuation, Reactive powder concrete, Shielding characteristic, Gamma rays
Kaynak
Construction and Building Materials
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
189
