Monitoring of Concrete Curing Process by Microwave Terminal Measurements

Rzepecka, Maria A.; Hamid, M.; Soliman, Afifi H.

doi:10.1109/tieci.1972.351126

Cited by 11 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Research on the material properties of concrete using the dielectric properties is normally in a localized scale and small volume of concrete, such as microwave terminal [11,12] or dielectric sensor [13]. Larger-scale investigations should involve GPR which was used to assess the mechanism of hydration [10], concrete composition [14], moisture contents [15,16], and pore size distribution [17].…”

Section: Introductionmentioning

confidence: 99%

A Study of Concrete Hydration and Dielectric Relaxation Mechanism Using Ground Penetrating Radar and Short-Time Fourier Transform

Lai

Kind

Wiggenhauser

2010

EURASIP J. Adv. Signal Process.

View full text Add to dashboard Cite

Ground penetrating radar (GPR) was used to characterize the frequency-dependent dielectric relaxation phenomena in ordinary Portland cement (OPC) hydration in concrete changing from fresh to hardened state. The study was experimented by measuring the changes of GPR A-scan waveforms over a period of 90 days, and processed the waveforms with short-time Fourier transform (STFT) in joint time-frequency analysis (JTFA) domain rather than a conventional time or frequency domain alone. The signals of the direct wave traveled at the concrete surface and the reflected wave from an embedded steel bar were transformed with STFT, in which the changes of peak frequency over ages were tracked. The peak frequencies were found to increase with ages and the patterns were found to match closely with primarily the well-known OPC hydration process and secondarily, the evaporation effect. The close match is contributed to the simultaneous effects converting free to bound water over time, on both conventional OPC hydration and dielectric relaxation mechanisms.

show abstract

Section: Introductionmentioning

confidence: 99%

A Study of Concrete Hydration and Dielectric Relaxation Mechanism Using Ground Penetrating Radar and Short-Time Fourier Transform

Lai

Kind

Wiggenhauser

2010

EURASIP J. Adv. Signal Process.

View full text Add to dashboard Cite

show abstract

“…It is clear that the permittivity is frequency-dependent in cementitious materials due to their water content, as reported by several studies [19], [35]- [37]. Additionally, the more hydrated the sample, the less dispersive (frequency dependant) the permittivity is, since the water, which is the most dispersive of the components of mortar, is gradually exhausted in the formation of hydrated cement, which has lower permittivity and dispersion [38]- [40]. To study the development with time, since the dielectric permittivity is a frequency dependant property of the material, its evolution for fresh mortar was calculated for a single frequency value of 46.375 GHz.…”

Section: Electromagnetic Monitoringmentioning

confidence: 81%

Linking the elastic, electromagnetic and thermal properties of fresh cement

Ospitia

Pourkazemi²,

Tsangouri³

et al. 2022

NDT & E International

View full text Add to dashboard Cite

“…GPR is one of the most versatile nondestructive techniques available currently, which include several applications in civil engineering structures, namely the presence of moisture (Maierhofer et al, 1998) and assessment of water content in fresh content and degree of hydration of cement (Rzepecka, 1972). GPR working principle is based on the emission of radiowaves of a particular frequency and in the regain of reflected echoes.…”

Section: Methodsmentioning

confidence: 99%