Determination of critical moisture content in porous materials by IR thermography

Tavukçuoğlu, Ayşe; Grinzato, E.

doi:10.3166/qirt.3.231-245

Cited by 17 publications

(14 citation statements)

References 5 publications

(7 reference statements)

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“…Quantitative IR Thermography (QIRT) can be used for the determination of critical moisture content (Θ c ) level for porous materials [14,15]. The weathering conditions, such as the cycles of freezing-thawing, wetting-drying and salt crystallization, are more damaging for wet porous materials when the moisture content is above the critical moisture content (Θ c ) [23,24].…”

Section: Determination Of Critical Moisture Content In Porous Materiamentioning

confidence: 99%

“…A procedure based on QIRT was developed for precisely-analysing the transition stage between the saturated and dry phases of a porous material in order to determine its effective Θ c , as a physical property [14]. The Θ c level for some building materials, such as repair brick and tuffs, were examined in laboratory by QIRT and the Standard Gravimetric Method (SGM).…”

Section: Determination Of Critical Moisture Content In Porous Materiamentioning

confidence: 99%

“…During the process of moisture desorption at certain boundary conditions, the weight loss of water-saturated brick and tuff samples together with the thermographic view of their evaporating surface were recorded with 2s intervals. The data obtained were then analysed in terms of evaporation rate (R E ) and a new informative parameter called Evaporative Thermal Index (ETI) (figure 9) [14]. The standard test of evaporation rate is based on the sample weight loss change in time during the drying process, knowing the evaporating area [25].…”

Section: Cmss-2017mentioning

confidence: 99%

“…The standard test of evaporation rate is based on the sample weight loss change in time during the drying process, knowing the evaporating area [25]. ETI is related to the surface temperature and defined as the normalized temperature difference between actual (evaporating) and reference (dry) surface [14]. Then, R E and ETI values were computed as a function of the moisture content in the sample.…”

Section: Cmss-2017mentioning

confidence: 99%

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Non-Destructive Testing for Building Diagnostics and Monitoring: Experience Achieved with Case Studies

Tavukçuoğlu

2018

MATEC Web Conf.

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Building inspection on site, in other words in-situ examinations of buildings is a troublesome work that necessitates the use of non-destructive investigation (NDT) techniques. One of the main concerns of non-destructive testing studies is to improve in-situ use of NDT techniques for diagnostic and monitoring studies. The quantitative infrared thermography (QIRT) and ultrasonic pulse velocity (UPV) measurements have distinct importance in that regard. The joint use of QIRT and ultrasonic testing allows in-situ evaluation and monitoring of historical structures and contemporary ones in relation to moisture, thermal, materials and structural failures while the buildings themselves remain intact. For instances, those methods are useful for detection of visible and invisible cracks, thermal bridges and damp zones in building materials, components and functional systems as well as for soundness assessment of materials and thermal performance assessment of building components. In addition, those methods are promising for moisture content analyses in materials and monitoring the success of conservation treatments or interventions in structures. The in-situ NDT studies for diagnostic purposes should start with the mapping of decay forms and scanning of building surfaces with infrared images. Quantitative analyses are shaped for data acquisition on site and at laboratory from representative sound and problem areas in structures or laboratory samples. Laboratory analyses are needed to support in-situ examinations and to establish the reference data for better interpretation of in situ data. Advances in laboratory tests using IRT and ultrasonic testing are guiding for in-situ materials investigations based on measurable parameters. The knowledge and experience on QIRT and ultrasonic testing are promising for the innovative studies on today’s materials technologies, building science and conservation/maintenance practices. Such studies demand a multi-disciplinary approach that leads to bring together knowledge on materials science and building science.

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Section: Determination Of Critical Moisture Content In Porous Materiamentioning

confidence: 99%

Section: Determination Of Critical Moisture Content In Porous Materiamentioning

confidence: 99%

Section: Cmss-2017mentioning

confidence: 99%

Section: Cmss-2017mentioning

confidence: 99%

See 2 more Smart Citations

Non-Destructive Testing for Building Diagnostics and Monitoring: Experience Achieved with Case Studies

Tavukçuoğlu

2018

MATEC Web Conf.

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“…Furthermore, the content of moisture of the solid surface can be estimated exploiting peculiarities of porous materials adsorption-desorption isotherms (Camuffo, 2001). The evaporation rate is evaluated, by means of thermographic detections of temperature differences of surface area with different moisture content (Tavukçuoglu and Grinzato, 2006), but taking into account the air temperature, as well.…”

Section: Accurate Thermographic Measurement Of Surface and Air Tempermentioning

confidence: 99%

Humidity and air temperature measurement by quantitative infrared thermography

Grinzato

2010

Quantitative InfraRed Thermography Journal

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An integrated study for mapping the moisture distribution in an ancient damaged wall painting

et al. 2009

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An integrated study of microclimate monitoring, IR thermography (IRT), gravimetric tests and portable unilateral nuclear magnetic resonance (NMR) was applied in the framework of planning emergency intervention on a very deteriorated wall painting in San Rocco church, Cornaredo (Milan, Italy). The IRT investigation supported by gravimetric tests showed that the worst damage, due to water infiltration, was localized on the wall painting of the northern wall. Unilateral NMR, a new non-destructive technique which measures the hydrogen signal of the moisture and that was applied directly to the wall, allowed a detailed map of the distribution of the moisture in the plaster underlying the wall panting to be obtained. With a proper calibration of the integral of the recorded signal with suitable specimens, each area of the map corresponded to an accurate amount of moisture. IRT, gravimetric tests and unilateral NMR applied to investigate the northern wall painting showed the presence of two wet areas separated by a dry area. The moisture found in the lower area was ascribed to the occurrence of rising damp at the bottom of the wall due to the slope of the garden soil towards the northern exterior. The moisture found in the upper area was ascribed to condensation phenomena associated with the presence of a considerable amount of soluble, hygroscopic salts. In the framework of this integrated study, IRT investigation and gravimetric methods validated portable unilateral NMR as a new analytical tool for measuring in situ and without any sampling of the distribution and amount of moisture in wall paintings.

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Determination of critical moisture content in porous materials by IR thermography

Cited by 17 publications

References 5 publications

Non-Destructive Testing for Building Diagnostics and Monitoring: Experience Achieved with Case Studies

Non-Destructive Testing for Building Diagnostics and Monitoring: Experience Achieved with Case Studies

Humidity and air temperature measurement by quantitative infrared thermography

An integrated study for mapping the moisture distribution in an ancient damaged wall painting

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