On-site Elemental Analysis of Concrete by Portable Energy Dispersive X-ray Fluorescence Analyzer

To meet strong demand for realizing an effective tool to diagnose salt distribution in concrete infrastructures, we have started a development of a new technique using a prompt gamma neutron activation analysis (PGNAA) at the RIKEN accelerator-driven compact neutron source (RANS). So far, by applying PGNAA we have experimentally confirmed that neutrons from RANS can detect small enough amounts of chlorine within the marginal concentration of around 1.2 kg/m3 to involve steel corrosion. In this study, we have proposed two methods to derive the salt depth profile which is critical information of steel corrosion start. The first one utilizes a difference in the intensity ratio of two different γ-ray energies of interest, which is depending on the depth where the neutron capture reaction arises inside the concrete. The second is called the collimator method that measure γ-rays coming through a collimator around detector. Detection of γ-ray associated with 35Cl coming from the assembly of concrete has been also simulated with conditions of neutrons from RANS and a collimator. The feasibility of the method was discussed.

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“…Several conventional methods for salt distribution measurement exist [2][3][4]. They need several steps before measurement.…”

Section: Introductionmentioning

confidence: 99%

Study of a collimation method as a nondestructive diagnostic diagnostic technique by PGNAA for salt distribution in concrete structures at RANS

et al. 2020

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“…Although there are existing measurement methods of chloride ion distribution such as fluorescent X-ray analysis (Kanada et al 2006), electron beam micro-analyzers (JSCE 2005), and potentiometric titration methods in JIS A 1154 (JIS 2012), they need the core samples to be collected from the structures to be tested. In addition, it takes time and cost for premeasurement processing.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of Nondestructive Diagnostic Method for Chlorine in Concrete by Compact Neutron Source and PGA

Wakabayashi

Yoshimura

Mizuta

et al. 2019

ACT

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As a nondestructive measurement of chloride ion distribution in concrete is important from the viewpoint of preventive maintenance against chloride attack causing deterioration of many concrete structures, a diagnostic technique of a nondestructive measurement method using a neutron-captured prompt gamma-ray analysis (PGA) is being developed. As the first step of development, the γ-ray sensitivities of mortar samples with different chloride ion concentrations were determined experimentally by PGA using the RIKEN accelerator-driven compact neutron source. The results showed that the present detection system was sensitive to a chloride ion concentration of 1 kg/m 3 , which is lower than the marginal chloride ion concentration of 1.2 -2.5 kg/m 3 to incur corrosion. The time of flight measurement technique with pulsed neutrons was applied concerning the depth profile of chloride ion distribution in concrete.

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Sensing of Dissolved Chlorides Using Intrinsic Signals

Ghandehari

Vimer

Spellane

2018

Optical Phenomenology and Applications

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On-site Elemental Analysis of Concrete by Portable Energy Dispersive X-ray Fluorescence Analyzer

Cited by 7 publications

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Study of a collimation method as a nondestructive diagnostic diagnostic technique by PGNAA for salt distribution in concrete structures at RANS

Study of a collimation method as a nondestructive diagnostic diagnostic technique by PGNAA for salt distribution in concrete structures at RANS

Feasibility Study of Nondestructive Diagnostic Method for Chlorine in Concrete by Compact Neutron Source and PGA

Sensing of Dissolved Chlorides Using Intrinsic Signals

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