The effect of cement and aggregate type and w/c ratio on the bound water content and neutron shielding efficiency of concretes

Prochoń, Piotr; Piotrowski, Tomasz

doi:10.1016/j.conbuildmat.2020.120210

Cited by 31 publications

(6 citation statements)

References 26 publications

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“…Благодаря равномерному распределению мелкодисперсного металлического заполнителя в структуре композита полученный материал с большими поверхностями раздела фаз является на микроскопическом уровне аналогии многослойных металловодных экранов. Взаимоувязывание в структуре мелкозернистого металлонасыщенного бетона искусственно синтезированных новообразований (продукты гидратации минерального вяжущего и окисленного металлического наполнителя), которые содержат повышенное содержание водорода в виде химически связанной воды и тяжелых элементов (металла), обеспечивать приобретение промежуточных радиационно-защитных свойств между металлическими и обычными бетонными экранами Для исследования влияния рецептурно-технологических параметров и получения бетонов обладающих высокими эксплуатационными характеристиками и свойствами к радиационной защите, необходимо использовать высокоактивные композиционные вяжущие вещества, такие как тонкомолотый цемент и вяжущие низкой водопотребности [23][24][25].…”

Section: результаты и обсужденияunclassified

Effect of Wollastonite on the Mechanical Characteristics of Concrete

Kozin

Fediuk

Ilinskiy

et al. 2020

Construction Materials and Products

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Improvement of the physical and mechanical properties of cement composites should be accompanied by the disposal of industrial waste of various generation. Therefore, the paper proposes the principles of controlling the strength properties of concrete, which consist in the complex effect of wollastonite obtained from boron production waste on the processes of structure formation of the cement matrix. When this introduced in an amount of 2-8 wt. % wollastonite has a dual function as a mineral filler and a reinforcing fiber. It has been proven that in the presence of wollastonite, the concrete mix becomes lighter without reducing its physical and mechanical properties. It was revealed that the early strength for all the developed compositions with the addition of wollastonite increases due to the acceleration of hydration processes. Calcium silicate, which is wollastonite CaSiO3, has a close chemical composition with cement clinker, especially with Ca2SiO4 belite and Ca3SiO5 alite. This leads to the formation of a chemically homogeneous and, as a result, hardened microstructure. Elongated wollastonite fibers with good adhesion to the cement stone provide effective micro-reinforcement of the concrete composite. Using the results will lead to the possibility of designing high-strength concretes, including for special structures

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Section: результаты и обсужденияunclassified

Effect of Wollastonite on the Mechanical Characteristics of Concrete

Kozin

Fediuk

Ilinskiy

et al. 2020

Construction Materials and Products

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“…[6][7][8] Aiming to attenuate these radiations, researchers tried to utilize the existing materials (lead, concrete, aluminium, water, and so on) or developed new ones. 9,10 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%

Phthalonitrile resin reinforced silane surface modified boron carbide: Efficient neutrons screening and exceptional thermal properties

Abdous

Derradji

Mehelli

et al. 2023

High Performance Polymers

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The design of lightweight neutron shields has been restricted for quite some time to the use of epoxy thermosets as the main building blocks. Meanwhile, the recent developments in the field of polymers suggest otherwise. Indeed, the phthalonitrile (PN) resins have taken the lead over traditional thermosets in many demanding applications. Therefore, in a vision to introduce newer matrices with better performances and to further expand the applications of the PN resins into the nuclear field, the neutron shielding efficiency along with the thermal resistance performances of the neat PN polymer and its subsequent silane surface-modified B4C-reinforced composites were investigated. The neutron shielding measurements were performed using an optimized experimental setup at the NUR research reactor in Algiers. The neat PN polymer displayed better thermal neutron screening performances than the epoxy and benzoxazine, with a macroscopic cross-section (Σ) of a 1.936 cm−1, equivalent to a mean free path (λ) of 0.358 cm. The effect of the particle amount was also studied to maximize the shielding ability of the developed materials. For instance, the PN composite containing 20 wt. % of B4C displayed an outstanding screening ratio of about 99.8% 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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“…Topcu [13] reported that the w/c ratio is important in reducing the radioactive permeability and the shrinkage cracks in concrete. Prochon et al [14] reported that unlike the w/c ratio of granitebased concrete, aggregate/cement types are important in absorbing radiation. Bellum et al [17] compared their modulus of elasticity with certain standards, and the modulus of elasticity that researchers found was between 12.904 GPa and 31.107 GPa.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and radiation attenuation properties of conventional and heavy concrete with diverse aggregate and water/cement ratios

2022

JCE

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This paper presents the results of comprehensive laboratory work conducted for investigating the mechanical and radiation attenuation characteristics of heavyweight concrete produced with pyrite, chromium, and magnetite aggregates and normal weight concretes produced with three different water/ cement (w/c) ratios. Various experiments were conducted to determine the compressive strengths, ultrasound transmission velocities, experimental elasticity modules, and mass attenuation coefficients of these concretes. Heavy and normal weight concretes exhibited similar behaviour in terms of compressive strength and elasticity modules. In heavyweight concretes, with increased w/c ratios (by keeping the amount of water constant and decreasing the amount of cement), the corresponding density increased due to the increase in the amount of high-density aggregates rather than cement in the composition of concrete. Thus, heavyweight concretes produced with a high w/c ratio and low strength can absorb more X-rays. Mass attenuation coefficients converge in heavy and normal weight concretes with different densities at high energy levels.

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The effect of cement and aggregate type and w/c ratio on the bound water content and neutron shielding efficiency of concretes

Cited by 31 publications

References 26 publications

Effect of Wollastonite on the Mechanical Characteristics of Concrete

Effect of Wollastonite on the Mechanical Characteristics of Concrete

Phthalonitrile resin reinforced silane surface modified boron carbide: Efficient neutrons screening and exceptional thermal properties

Mechanical and radiation attenuation properties of conventional and heavy concrete with diverse aggregate and water/cement ratios

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