Application of three self-developed ECT sensors for monitoring the moisture content in sand and mortar

Wang, Wentao; Zhao, Kaiyue; Zhang, Peng; Bao, Jiuwen; Xue, Shanfeng

doi:10.1016/j.conbuildmat.2020.121008

Cited by 43 publications

(10 citation statements)

References 36 publications

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“…In practical engineering applications, the structure may be in different saturated states. At this time, non-destructive testing moisture content testing can be used to measure the actual moisture content of the structure [ 29 , 30 , 31 ]. An approximate evaluation of fracture properties at low-temperature conditions with different moisture content forms the basis of this study.…”

Section: Methodsmentioning

confidence: 99%

Effect of Temperatures and Moisture Content on the Fracture Properties of Engineered Cementitious Composites (ECC)

Gao

Xie

2022

Materials

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This research will help to improve our understanding of the fracture properties of ECC at low temperatures (long-term low temperatures, freeze–thaw) and evaluate the safety properties of ECC under low-temperature conditions. Three levels of saturation (saturated, semi-saturated, and dry), four target temperatures (20, 0, −20, and −60 °C), and the effect of the coupled of the two on the mode I fracture properties of ECC were investigated. Then, we compared and analyzed the fracture properties of ECC loaded at 20 and −20 °C, after different freeze–thaw cycles (25, 50, 100 cycles), which were compared with saturated specimens without freeze–thaw at the four target temperatures to analyze the differences in low-temperature and freeze–thaw failure mechanisms. Temperatures and saturation have a significant effect on the fracture properties. Low temperatures and freeze–thaw treatments both decreased the nominal fracture energy of ECC. Distinct differences in matrix and fiber-matrix interface damage mechanisms have been discovered. Low temperatures treatment transforms ECC from a ductile to a brittle fracture mode. However, even after 100 freeze–thaw cycles, it remains ductile fractured. This study complements the deficiencies of ECC in low-temperature theoretical and experimental applications, and it sets the stage for a broad range of ECC applications.

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Section: Methodsmentioning

confidence: 99%

Effect of Temperatures and Moisture Content on the Fracture Properties of Engineered Cementitious Composites (ECC)

Gao

Xie

2022

Materials

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“…The workability of concrete is defined in ASTM C 125 as the property that determines the effort required to manipulate freshly mixed concrete with a minimum loss of uniformity. The importance of workability in concrete technology is apparent [50]. It is one of the key properties that must be satisfied.…”

Section: Prepared With Electric-activated Watermentioning

confidence: 99%

Preparation of Electric- and Magnetic-Activated Water and Its Influence on the Workability and Mechanical Properties of Cement Mortar

et al. 2021

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Cement-based materials prepared with activated water induced by a magnetic field or electric field represent a possible solution to environmental issues caused by the worldwide utilization of chemical admixtures. In this contribution, electric- and magnetic-activated water have been produced. The workability and mechanical properties of cement mortar prepared with this activated water have been investigated. The results indicate that the pH and absorbance (Abs) values of the water varied as the electric and magnetic field changed, and their values increased significantly, exhibiting improved activity compared with that of the untreated water. In addition, activated water still retains activity within 30 min of the resting time. The fluidity of the cement paste prepared with electric-activated water was significantly larger than that of the untreated paste. However, the level of improvement differed with the worst performance resulting from cement paste prepared with alternating voltage activated water. In terms of mechanical properties, both compressive strength and flexural strength obtained its maximum values at 280 mT with two processing cycles. The compressive strength increased 26% as the curing time increased from 7 days to 28 days and flexural strength increased by 31%. In addition, through the introduction of magnetic-activated water into cement mortar, the mechanical strength can be maintained without losing its workability when the amount of cement is reduced.

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“…Sensors 2021, 21, 7170 3 of 16 both stationary and dynamic measurements has been proven in several studies [22][23][24][25].…”

Section: Microwave Drying Processmentioning

confidence: 99%

“…However, these guard electrodes were not involved in the measurement procedure. The polymer foam 2D cross-section had a rectangular domain with a width of 49.3 cm, which dictated a wide rectangular shape for the ECT sensor structure, while most developed ECT sensors are round [25][26][27]. This unusual structure imposed a considerable distance between non-neighboring electrodes, resulting in a weak measurement signal.…”

Section: Electrical Capacitance Tomographymentioning

confidence: 99%

“…A reconstruction algorithm is then used to estimate the permittivity distribution inside the imaging area. The efficiency of the ECT sensor in estimating the moisture content of materials in both stationary and dynamic measurements has been proven in several studies [22][23][24][25]. The ECT measurements are fast and can be employed for output signal collection in a continuous process.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

System Identification of Conveyor Belt Microwave Drying Process of Polymer Foams Using Electrical Capacitance Tomography

Hosseini

Kaasinen

Shoorehdeli

et al. 2021

Sensors

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The microwave drying process has a wide application in industry, including drying polymer foams after the impregnation process for sealings in the construction industry. The objective of the drying process is to reach a certain moisture in the foam by adjusting the power levels of the microwave sources. A moisture controller can be designed to achieve this goal; however, a process model is required to design model-based controllers. Since complex physics governs the microwave drying process, system identification tools are employed in this paper to exploit the process input and output information and find a simplified yet accurate model of the process. The moisture content of the foam that is the process output is measured using a designed electrical capacitance tomography (ECT) sensor. The ECT sensor estimates the 2D permittivity distribution of moving foams, which correlates with the foam moisture. Experiments are conducted to collect the ECT measurements while giving different inputs to the microwave sources. A state-space model is estimated using one of the collected datasets and is validated using the other datasets. The comparison between the model response and the actual measurements shows that the model is accurate enough to design a controller for the microwave drying process.

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Application of three self-developed ECT sensors for monitoring the moisture content in sand and mortar

Cited by 43 publications

References 36 publications

Effect of Temperatures and Moisture Content on the Fracture Properties of Engineered Cementitious Composites (ECC)

Effect of Temperatures and Moisture Content on the Fracture Properties of Engineered Cementitious Composites (ECC)

Preparation of Electric- and Magnetic-Activated Water and Its Influence on the Workability and Mechanical Properties of Cement Mortar

System Identification of Conveyor Belt Microwave Drying Process of Polymer Foams Using Electrical Capacitance Tomography

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