Chlorine signal attenuation in concrete

Naqvi, A.A.; Maslehuddin, Mohammed; ur-Rehman, Khateeb; Al‐Amoudi, Omar S. Baghabra

doi:10.1016/j.apradiso.2015.07.010

Cited by 5 publications

(2 citation statements)

References 9 publications

(23 reference statements)

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“…During hydration of cement, C 3 S and C 3 A also react with other components in cement to form hydrated reaction of ettringite (Ca 6 Al 2 (SO 4 ) 3 (OH) 12 •26H 2 O), namely, three sulfur hydrated aluminum sulfate type AFt, single sulfur hydrated aluminum sulfate calcium AFm, calcium hydroxide CH, and calcium silicate C-S-H gel, and the microstructure 3(a). With the increase of time, the hydration reaction of cement is gradually sufficient, and the increase of aft content makes the internal cracks of rubber concrete decrease, and the wave velocity increases.…”

Section: Resultsmentioning

confidence: 99%

“…Da et al [10] found that prolonging the wet curing age or using magnesium sulfate cement could improve its ability to resist chloride diffusion and extended the service life of the structure. Based on the portable neutron generator, the concentration of chloride ion in various kinds of concrete by single instant gamma ray energy method has been measured by Naqvi et al [11,12], and its pollution in concrete has also been analyzed. e micromorphology and pore structure characteristics of the composite admixture concrete after being eroded by chloride through the comparison of the macroperformance and microcharacteristics test has been analyzed by Li et al [13].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Research on Chloride Erosion Resistance of Rubber Concrete

Zhu

Pang

Wang

et al. 2020

Advances in Civil Engineering

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Chloride corrosion test was carried out in 4% NaCl solution to study the chloride corrosion resistance of rubber concrete. Rubber concrete was prepared by using 20 mesh, 1∼3 mm, and 3∼6 mm rubber particles instead of sand by 5%, 10%, 15%, and 20% of the cementitious material mass. The P-wave velocity and compressive strength of rubber concrete were measured. The microstructure of rubber concrete corroded by chloride was analyzed by SEM. The micromorphology was compared with the macrofailure characteristics under uniaxial compression. The results show that the rubber concrete was still in the early stage of erosion. With the increase of immersion time at the age of 110 days, the P-wave velocity and compressive strength of concrete were generally on the rise. Furthermore, during the period of erosion, the mechanical properties of rubber concrete increased with the increase of rubber particle size and decreased with the increase of the content. Therefore, when the rubber particle size was 3∼6 mm and the content was 5%, the antierosion performance was the best. This study has a certain guiding significance for the chloride corrosion resistance of rubber concrete.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Research on Chloride Erosion Resistance of Rubber Concrete

Zhu

Pang

Wang

et al. 2020

Advances in Civil Engineering

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HPGe-detector shielding optimization with MCNP for the MEDINA neutron activation cell

Nicol

Mauerhofer

Carasco

et al. 2016

J Radioanal Nucl Chem

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International audienceA gamma and neutron shielding for the HPGe-detector of the MEDINA facility is designed by means of MCNP5 simulations. The performance of the shielding is validated comparing MCNP5 calculations and experimental background reduction factors for easy-to-implement shielding configurations. A good correspondence between simulations and experiment is observed, which comfort the expected background reduction factors of about 4 to 5 predicted by simulation for the neutron and photon currents entering in the detector, respectively, in the case of a complete implementation of the neutron and gamma shielding in MEDINA

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