Soil moisture and density monitoring methodology using TDR measurements

Bhuyan, Habibullah; Scheuermann, Alexander; Bodin, Didier; Becker, Rolf

doi:10.1080/10298436.2018.1537491

Cited by 19 publications

(7 citation statements)

References 22 publications

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“…The high concentration of K + ions in the leachate of the LLS samples stabilised above the OLC of the lateritic soil is attributed to the highly alkaline environment produced by the dissolution of Ca(OH) 2 to release Ca 2+ and OH − ions; this intensified the dissolution of the siliceous and aluminous compounds from the lattices of the clay minerals to release K + ions and other ions such as Al 3+ , Na + , and Si 4+ . These ions then react with Ca 2+ cations from the lime to form cementitious products responsible for long-term strength improvements in the LLS soils following the reaction mechanisms as represented by Equations ( 2)- (5).…”

Section: Calcium and Potassium Concentrationsmentioning

confidence: 99%

“…These engineering failures have been attributed to the high cost of excavating and replacing problematic soils with suitable materials and the strict legislative rules that govern the utilisation of these scarce natural resources for earthworks construction purposes. The adverse effect of rainfall-induced water ingress into pavement structural layers and its impact on the service life of flexible pavements and railway subgrades have been reported in recent literature [2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Appropriate Use of Lime in the Study of the Physicochemical Behaviour of Stabilised Lateritic Soil under Continuous Water Ingress

et al. 2020

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Lime stabilisation is one of the traditional methods of improving the engineering properties of lateritic soils for use as subgrade and foundation materials for the construction of road pavements and highway embankments. Understanding the mechanical performance of lime-stabilised lateritic subgrades in terms of their durability under continuous water ingress will improve environmental sustainability by conserving scarce natural resources and reducing the environmental impacts of repair and replacement of pavements. However, there are several conflicting reports on the durability of lime-stabilised soils subjected to continuous water ingress and harsh environmental conditions. Therefore, this paper evaluates the influence of leaching on the physicochemical behaviour and durability of lime-stabilised lateritic soil under continuous water ingress, simulating the typical experience in a tropical environment. Variations in the strength and durability of the lateritic soil at various lime contents (0, 2.5, 5, 7.5, 10, 15, and 20 wt.%) and soaking periods (3, 7, 14 and 28 days) were evaluated by performing the California bearing ratio tests before and after subjecting the lime-lateritic soil (LLS) samples to continuous leaching using two modified leaching cells. Furthermore, physicochemical analysis was performed to assess the variation of cation concentrations and changes in the physical properties of the pore fluid as the leaching time progressed from 3 to 28 days. The results show that the minimum strength reduction index of the soil corresponds to its lime stabilisation optimum (LSO). Electrical conductivity decreased monotonically and almost uniformly with an increase in leaching time, irrespective of lime content. So, too, was calcium concentration and to a lesser degree for pH and potassium concentration. Adverse changes in the physicochemical behaviour of the LLS samples occurred at lime contents below and slightly above the optimum lime content of the soil. Whereas permanent pozzolanic reactions occurred at lime contents above the LSO and thus resulted in a 45-fold increase in strength and durability. The results are significant for reducing the detrimental effect of the leaching-induced deterioration of flexible pavements founded on tropical floodplains.

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Section: Calcium and Potassium Concentrationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Appropriate Use of Lime in the Study of the Physicochemical Behaviour of Stabilised Lateritic Soil under Continuous Water Ingress

et al. 2020

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“…Current RF-based soil moisture sensing technique (e.g.,TD-R [21,34] and FDR [22,35]) rely on measuring the soil permittivity because the soil permittivity affects RF signal's transmission property [26,31] or the circuit's resonant frequency [28]. The relationship between soil moisture and soil permittivity provide the basis for RF-based soil moisture sensing technique.…”

Section: The Relationship Between Soil Moisture and Soil Permittivitymentioning

confidence: 99%

Detecting Soil Moisture Levels Using Battery-Free Wi-Fi Tag

Jiao¹,

Wang²,

He³

et al. 2022

Preprint

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Soil sensing plays an important role in increasing agricultural output. Existing soil sensing methods failed to achieve both high accuracy and low cost. This paper presents Soil-TAG, a battery-free Wi-Fi tag based high accuracy, low-cost and long range soil moisture sensing system. To measure the soil moisture, our idea is converting changes in soil moisture levels into the frequency response of the tag's resonator. To achieve high accuracy, we optimize key resonator parameters to increase the frequency response sensitivity for sensing even small soil moisture changes. To improve the working range, we design patch antenna array for the tag and employ beamforming and beam nulling at the transceiver side. Experimental results show that SoilTAG achieves a 2% high accuracy when the working range is less than 6 m, and when the working range is up to 10 m, it achieves 3.64% accuracy.

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“…Estos métodos electromagnéticos resultan útiles cuando las muestras y lugar del ensayo deben ser conservados y, por lo general, se utilizan para monitorear situaciones a lo largo del tiempo, con el fin de evaluar y monitorear las variaciones estacionales de humedad. A continuación, se muestran ejemplos de estudios que emplean ambas técnicas para medir y controlar la humedad en estructuras y materiales utilizados en ingeniería civil: (Klemunes, 1998), (Jiang y Tayabji, 1999), (Al-Qadi et al, 2004), (Ekblad y Isacsson, 2007), (Benedetto, 2010), (Khakiev et al, 2014), (Thring et al, 2014), (Benedetto et al, 2015), (Tosti y Slob, 2015), (Fernandes et al, 2017) y (Bhuyan et al, 2018).…”

Section: Introductionunclassified

Calibración de un modelo empírico para la evaluación y monitoreo del contenido de humedad en suelos tropicales compactados usados en la subrasante de pavimentos

et al. 2020

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Subgrade moisture variation monitoring and control is important due to its influence on road pavement performance and service life. The precise application of noninvasive techniques such as time domain reflectometry (TDR) and ground penetration radar (GPR) in compacted tropical soils depend on calibration models, that consider their mineralogical composition and geotechnical properties. The present work aims to determine calibration models that relate dielectric permittivity with moisture variation in compacted tropical soils. TDR technique was used with low-cost probes and soil calibration columns developed at laboratory for reading dielectric permittivity and define its relationship with moisture. Results showed that through laboratory standardized procedures, it is possible to determine calibration models according to the required accuracy in moisture control in the subgrade. It was found that the high density and magnetic properties of tropical soils significantly influenced the determination of dielectric permittivity and consequently in moisture estimates, hence reaffirming the need of specific calibrations for these types of soils.

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Soil moisture and density monitoring methodology using TDR measurements

Cited by 19 publications

References 22 publications

Appropriate Use of Lime in the Study of the Physicochemical Behaviour of Stabilised Lateritic Soil under Continuous Water Ingress

Appropriate Use of Lime in the Study of the Physicochemical Behaviour of Stabilised Lateritic Soil under Continuous Water Ingress

Detecting Soil Moisture Levels Using Battery-Free Wi-Fi Tag

Calibración de un modelo empírico para la evaluación y monitoreo del contenido de humedad en suelos tropicales compactados usados en la subrasante de pavimentos

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