Quantification of Cement Hydration through Neutron Radiography with Scatter Rejection

Tremsin, Anton S.; Lehmann, Eberhard; McPhate, Jason B.; Vallerga, J. V.; Siegmund, Oswald H. W.; White, Brian; White, Paul L.; Feller, W. Bruce; Beer, Frikkie de; Kockelmann, W.

doi:10.1109/tns.2015.2428231

Cited by 12 publications

(7 citation statements)

References 35 publications

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“…Due to the hydration heat, temperature measurement and thermography are common methods to monitor the curing process of concrete by embedded sensors such as thermocouples (Azenha et al, 2011; Ghirian and Fall, 2013) and fiber optic sensors (Kesavan et al, 2010; Luo et al, 2013; Zou et al, 2013). Other recently developed methods including ground penetrating radar (Lai et al, 2010), x-ray diffraction and scanning electron microscopy (Bois et al, 1998; Tremsin et al, 2015), non-contact electrical resistivity and dielectric constant measurement (Shen et al, 2016; Sun, 2008) have been reported in literatures. Most of these methods have to be performed with relatively bulky equipment.…”

Section: Introductionmentioning

confidence: 99%

An embeddable spherical smart aggregate for monitoring concrete hydration in very early age based on electromechanical impedance method

Fan

Zhao

Kong

et al. 2020

Journal of Intelligent Material Systems and Structures

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In this paper, a new embeddable spherical smart aggregate (SSA) was utilized to monitor concrete curing in very early age. Overcoming the limitation of the existing PZT-patch-based transducers, the SSA provides vital changing information in all directions of host structure. To verify the advantage of SSA in structural health monitoring (SHM), the sensitivities of SSA and smart aggregate (SA) in monitoring concrete cube deformation and stiffness variation were analyzed and compared by numerical simulation. The feasibility of SSA in monitoring the concrete hydration process was studied by experiments utilizing electromechanical impedance (EMI) technique. At last, four SSAs were embedded in a concrete column to study the practicality of SSA in monitoring the concrete curing process in very early age. The EMI signatures and the root mean square deviation (RMSD) values of the collected information from SSAs were analyzed. The results illustrate that the SSA is more sensitive than SA in monitoring the concrete deformation and stiffness variation. The data measured by SSA in monitoring the concrete hydration process fluctuates more obviously than the data recorded by SA. The new spherical transducer can effectively and reliably monitor the concrete hydration process.

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Section: Introductionmentioning

confidence: 99%

An embeddable spherical smart aggregate for monitoring concrete hydration in very early age based on electromechanical impedance method

Fan

Zhao

Kong

et al. 2020

Journal of Intelligent Material Systems and Structures

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“…Quantification of water or hydrogen content is one of the unique capabilities of neutron imaging, which is often used for the studies of water uptake by roots [23] or cement [24,25], and the hydration of Zr-alloys [26] and others. We performed a calibration measurement of hydrogen concentration in zirconium alloy samples with known H quantity.…”

Section: Quantification Of Hydrogen Contentmentioning

confidence: 99%

High resolution neutron imaging capabilities at BOA beamline at Paul Scherrer Institut

Tremsin

Morgano

Panzner

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tThe cold neutron spectrum of the Beamline for neutron Optics and other Applications (BOA) at Paul Scherrer Institut enables high contrast neutron imaging because neutron cross sections for many materials increase with neutron wavelength. However, for many neutron imaging applications, spatial resolution can be as important as contrast. In this paper the neutron transmission imaging capabilities of an MCP/Timepix detector installed at the BOA beamline are presented, demonstrating the possibilities for studying sub-20 mm features in various samples. In addition to conventional neutron radiography and microtomography, the high degree of neutron polarization at the BOA beamline can be very attractive for imaging of magnetic fields, as demonstrated by our measurements. We also show that a collimated cold neutron beamline combined with a high resolution detector can produce image artifacts, (e.g. edge enhancements) due to neutron refraction and scattering. The results of our experiments indicate that the BOA beamline is a valuable addition to neutron imaging facilities, providing improved and sometimes unique capabilities for non-destructive studies with cold neutrons.

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“…providing the attenuation coefficient of water is known for the given beam spectra. beamline with the Be filter ~0.3 mm-1 [21], [22]. With that assumption the time dependence of the water thickness in several areas of the steam engine was measured as shown in Figures 14 and 15.…”

Section: Time-resolved Quantification Of Water Content Inside the Stementioning

confidence: 99%

“…Combining all timing phases together improves the statistics, as shown in Figure 13, where the timedependence of the water distribution is completely eliminated and only the average value over the entire cycle is visualized. , [22]. With that assumption the time dependence of the water thickness in several areas of the steam engine was measured as shown in Figures 14 and 15.…”

Section: Dynamics Of Water Distribution Within a Steam Enginementioning

confidence: 99%

Time-resolved neutron imaging at ANTARES cold neutron beamline

et al. 2015

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In non-destructive evaluation with X-rays light elements embedded in dense, heavy (or high-Z) matrices show little contrast and their structural details can hardly be revealed. Neutron radiography, on the other hand, provides a solution for those cases, in particular for hydrogenous materials, owing to the large neutron scattering cross section of hydrogen and uncorrelated dependency of neutron cross section on the atomic number. The majority of neutron imaging experiments at the present time is conducted with static objects mainly due to the limited flux intensity of neutron beamline facilities and sometimes due to the limitations of the detectors. However, some applications require the studies of dynamic phenomena and can now be conducted at several high intensity beamlines such as the recently rebuilt ANTARES beam line at the FRM-II reactor. In this paper we demonstrate the capabilities of time resolved imaging for repetitive processes, where different phases of the process can be imaged simultaneously and integrated over multiple cycles. A fast MCP/Timepix neutron counting detector was used to image the water distribution within a model steam engine operating at 10 Hz frequency. Within <10 minutes integration the amount of water was measured as a function of cycle time with a sub-mm spatial resolution, thereby demonstrating the capabilities of timeresolved neutron radiography for the future applications. The neutron spectrum of the ANTARES beamline as well as transmission spectra of a Fe sample were also measured with the Time Of Flight (TOF) technique in combination with a high resolution beam chopper. The energy resolution of our setup was found to be ~0.8% at 5 meV and ~1.7% at 25 meV. The background level (most likely gammas and epithermal/fast neutrons) of the ANTARES beamline was also measured in our experiments and found to be on the scale of 1-2% when no filters are installed in the beam.

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Quantification of Cement Hydration through Neutron Radiography with Scatter Rejection

Cited by 12 publications

References 35 publications

An embeddable spherical smart aggregate for monitoring concrete hydration in very early age based on electromechanical impedance method

An embeddable spherical smart aggregate for monitoring concrete hydration in very early age based on electromechanical impedance method

High resolution neutron imaging capabilities at BOA beamline at Paul Scherrer Institut

Time-resolved neutron imaging at ANTARES cold neutron beamline

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