A comprehensive study on the effect of water to cement ratio on the mechanical and radiation shielding properties of heavyweight concrete

Lotfi-Omran, Omid; Sadrmomtazi, Ali; Nikbin, Iman M.

doi:10.1016/j.conbuildmat.2019.116905

Cited by 72 publications

(38 citation statements)

References 47 publications

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“…The elastic modulus of concrete with iron-bearing aggregates, such as hematite and magnetite, is within the range of 27-60 GPa (Hussain et al 2018;Lotfi-Omran et al 2019), and with baryte aggregate 25-40 GPa (Hussain et al 2018;Özbay et al 2016;Gökçe et al 2018). A wide range of E c results from variability of rock properties and aggregate contents in concrete (Gökçe et al 2018;Saidani et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Early Age Hardening of Concrete with Heavy Aggregate in Gamma Radiation Source – Impact on the Modulus of Elasticity and Microstructural Features

Dąbrowski

Glinicki

Dziedzic

et al. 2021

ACT

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The effects of gamma irradiation on concrete properties during early hardening were studied towards radioactive waste storage or accelerated processing at precast plants. Concrete mixtures containing different mineral aggregates (baryte, magnetite, amphibolite) were investigated. During initial 16 hours of hardening the mixes were irradiated using 60 Co gamma source at the rate of 3.5 kGy/h. The mechanical properties and microstructural features of irradiated early-age concrete were tested: the secant elastic modulus, the compressive strength, the porosity and pore size distribution. XRD and SEM analysis were also performed. The results indicate both the stiffening and pore refinement in concrete due to early gamma irradiation. Effects of early irradiation on microstructural features of cement matrix were found in the subsurface layer up to the depth of 2 mm. The influence of different mineral aggregates in concrete on the radiationinduced changes of early age properties is discussed.

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Section: Discussionmentioning

confidence: 99%

Early Age Hardening of Concrete with Heavy Aggregate in Gamma Radiation Source – Impact on the Modulus of Elasticity and Microstructural Features

Dąbrowski

Glinicki

Dziedzic

et al. 2021

ACT

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“…Lotfi-Omran et al [11] investigated the influence of cement content and maximum aggregate size on the radiation shielding features of heavyweight concrete. Lotfi-Omran et al [12] explored the role of different water to cement ratio on the mechanical properties and radiation protection efficiency of heavyweight magnetite concrete. For this purpose, they used 137 Cs and 60 Co sources, and they found that the radiation protection efficiency is enhanced with the reduction of the water-to-cement ratio.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Effect of Introducing Micro- and Nanoparticle Bismuth Oxide (Bi2O3) on the Gamma Ray Shielding Performance of Novel Concrete

et al. 2021

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The aim of this study is to investigate the radiation shielding properties of novel concrete samples with bulk Bi2O3 and Bi2O3 nanoparticles (Bi2O3 NP) incorporated into its composition. The mass attenuation coefficient of the concrete samples without Bi2O3 and with 5 and 7 wt% bulk Bi2O3 were experimentally determined and were compared against values obtained using the XCOM and Geant4 simulations. Both methods greatly agree with the experimental values. The linear attenuation coefficients (LAC) of blank concrete (C-0), concrete with 5% bulk Bi2O3 (C-B5), and concrete with 5% nanoparticle Bi2O3 (C-N5) were determined and compared at a wide energy range. We found that the LAC follows the trend of C-0 < C-B5 < C-N5 at all the tested energies. Since both C-B5 and C-N5 have a greater LAC than C-0, these results indicate that the addition of Bi2O3 improves the shielding ability of the concretes. In addition, we investigated the influence of nanoparticle Bi2O3 on the LAC of the concretes. The half-value layer (HVL) for the concretes with bulk Bi2O3 and Bi2O3 nanoparticles is also investigated. At all energies, the C-0 has the greatest HVL, while C-N15 has the least. Thus, C-N15 concrete is the most space efficient, while C-0 is the least space efficient. The radiation protection efficiency (RPE) of the prepared concretes was found to decrease with increasing energy for all five samples. For C-0, the RPE decreased from 63.3% at 0.060 MeV to 13.48% at 1.408 MeV, while for C-N15, the RPE decreased from 87.9 to 15.09% for the same respective energies. Additionally, C-N5 had a greater RPE than C-B5, this result demonstrates that Bi2O3 NP are more efficient at shielding radiation than bulk Bi2O3.

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“…or developed new ones to render the use of the nuclear energy safer. [9][10][11] In fact, heavy materials and water are more suitable to be used inside nuclear reactors and to surround radioactive sources. Unfortunately, these materials cannot be used to design protective gears for human body and sensitive equipments.…”

Section: Introductionmentioning

confidence: 99%

Benzoxazine resin as an interesting building block for advanced neutrons shields

Mehelli

Derradji

Habes

et al. 2021

High Performance Polymers

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The design of lightweight neutrons shields has been restricted for quite some time to the use of the epoxy thermosets as the main building blocks. Meanwhile, the recent developments in the field of polymers suggest otherwise. Indeed, benzoxazine resins have taken the lead over the traditional thermosets in many exigent applications. Therefore, in a vision to introduce newer matrices with better performances and to further expand the applications of the benzoxazine resins into the nuclear field, the neutron shielding efficiency along with the thermal and thermomechanical performances of the neat benzoxazine polymer and its subsequent B4C-reinforced composites were investigated. The neutron shielding measurements were performed using an optimized experimental setup at NUR research reactor, Algiers. The neat benzoxazine polymer displayed almost similar thermal neutrons screening performances than the epoxy with a macroscopic cross-section (Σ) of a 0.724 cm− 1 equivalent to a mean free path (λ) of 0.957 cm. The effect of the particle amount was also studied to maximize the shielding ability of the developed materials. For instance, the benzoxazine composite containing 20 wt.% of B4C displayed the outstanding screening ratio of about 96% for a sample thickness of 13 mm. Finally, the remarkable findings were put into context by providing multifaceted comparisons with the available shielding materials.

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A comprehensive study on the effect of water to cement ratio on the mechanical and radiation shielding properties of heavyweight concrete

Cited by 72 publications

References 47 publications

Early Age Hardening of Concrete with Heavy Aggregate in Gamma Radiation Source – Impact on the Modulus of Elasticity and Microstructural Features

Early Age Hardening of Concrete with Heavy Aggregate in Gamma Radiation Source – Impact on the Modulus of Elasticity and Microstructural Features

Understanding the Effect of Introducing Micro- and Nanoparticle Bismuth Oxide (Bi2O3) on the Gamma Ray Shielding Performance of Novel Concrete

Benzoxazine resin as an interesting building block for advanced neutrons shields

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