Evaluation of Early-Age Concrete Compressive Strength with Ultrasonic Sensors

Yoon, Hyejin; Kim, Young Jin; Kim, Hee Seok; Kang, Jun Won; Koh, Hyun‐Moo

doi:10.3390/s17081817

Cited by 30 publications

(21 citation statements)

References 22 publications

(33 reference statements)

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“…A support vector machine (SVM) was used to classify the concrete strength in the research by Kim el al [ 36 ]. Based on the velocity change, early-age concrete strength can also be evaluated [ 37 , 38 , 39 ]. A swept sine wave and several constant frequency sine waves were produced in Reference [ 40 ] to completely understand the hydration condition of the inhomogeneous, over-cluttering, and high-scattering characteristics of concrete.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Effect of Fly Ash on Hydration Characterization in Self-Compacting Concrete (SCC) at Very Early Ages Using Piezoceramic Transducers

Zheng

Chen

Zhou

et al. 2018

Sensors

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Nowadays, the industrial waste, Fly Ash (FA), as a mineral admixture or a replacement of cement for the production of self-compacting concrete (SCC) has been increasingly used, because of its benefits in enhancing both fresh and long-term concrete properties and in promoting environmental-friendly construction. In this study, the conventional cement was replaced by FA at different rates (0%, 20%, 40%, 60% of the cement mass) for the SCC mixtures. The early-age (0–24 h) SCC hydration, which is a complicated chemical reaction in pozzolanic behavior, was characterized by using a pair of piezoceramic Smart Aggregates (SAs). One SA works as an actuator and the other works as a sensor. A sweep sine signal from 100 Hz to100 kHz was used as the excitation signal, which is helpful to understand the quantitative influence of fly ash on the kinetics of SCC hydration. During the hydration reaction, the received electrical signal was continuously detected by the sensor. The experimental results showed that increasing the volume of fly ash resulted in longer pozzolanic reaction time in SCCs, which successfully reveals the effect of fly ash volume on the hydration behavior in early age (0–24 h) hydration. In order to quantitatively evaluate the hydration in the 0–24 h, based on the wavelet packet energy analysis, the hydration completion index (HCI) and normalized hydration completion index (NHCI) were defined. The experimental results showed that the NHCI can clearly reveal the hydration completion progress during the early hydration age (0–24 h). To validate the accuracy of the test results based on SAs, a series of mechanical tests for penetration resistance of SCCs with different volumes of fly ash were carried out. The results predicted by the signal based on SAs gave reasonable agreement with the test results of penetration resistance. It can be concluded that a successful investigation of the influence of fly ash on early-age SCC hydration response can be achieved based on the analysis of the received electrical signal using the proposed method and the important hydration characteristics, such as initial and final setting time, and can be approximately predicted by NHCI values.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Effect of Fly Ash on Hydration Characterization in Self-Compacting Concrete (SCC) at Very Early Ages Using Piezoceramic Transducers

Zheng

Chen

Zhou

et al. 2018

Sensors

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“…www.mdpi.com/journal/sensors associated damage index based on wavelet-packet analysis was developed to help interpret the data. The development of smart-aggregate technology accelerated research on piezoceramic transducers in concrete structures in many applications, such as hydration monitoring [49][50][51], impact detection [52][53][54][55], blast-damage monitoring [56], bond-slip or debonding detection [57][58][59], and concrete compactness monitoring [60,61].…”

Section: Piezoceramic Transducersmentioning

confidence: 99%

Piezoceramic-Based Damage Monitoring of Concrete Structure for Underwater Blasting

Zhong

Xiong

2020

Sensors

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This paper developed a piezoelectric-transducer-based damage detection of concrete materials after blasting. Two specimens (with or without an energy-relieving structure) were subjected to a 40 m deep-underwater blasting load in an underwater-explosion vessel, and their damage was detected by a multifunctional piezoelectric-signal-monitoring and -analysis system before and after the explosion. Statistical-data analysis of the piezoelectric signals revealed four zones: crushing, fracture, damage, and safe zones. The signal energy was analyzed and calculated by wavelet-packet analysis, and the blasting-damage index was obtained after the concrete specimen was subjected to the impact load of the underwater explosion. The damage of the two specimens gradually decreased from the blast hole to the bottom of the specimen. The damage index of the specimen with the energy-relieving structure differed for the fracture area and the damage area, and the damage protection of the energy-relieving structure was prominent at the bottom of the specimen. The piezoelectric-transducer-based damage monitoring of concrete materials is sensitive to underwater blasting, and with wavelet-packet-energy analysis, it can be used for postblasting damage detection and the evaluation of concrete materials.

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“…In general, the medium values exhibited the same trend as the average values. The development of concrete compressive strength at an early age plays an important role during construction work and shortens the form removal time, which could reduce the construction period as well as costs (Yoon et al 2017). Figure 6a presents the effects of different amounts of latex on the early-age compressive strength of concrete.…”

Section: Concrete Compressive Strengthmentioning

confidence: 99%

Mechanical Performance and Durability of Latex-Modified Fiber-Reinforced Concrete

Truong

Son

Choi

2019

ACT

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In this study, the mechanical performance and durability of latex-modified fiber-reinforced concrete were experimentally investigated. For these purposes, various types of tests were carried out: compressive, flexural, restrained drying shrinkage, water-tightness, and freeze and thaw tests. In total, 59 test specimens were manufactured and performed in this study. The latex weight fractions of 10, 15, and 20% and the fiber volume fractions of 0.2 and 0.3% were used as main test parameters. For each fiber volume fraction, amorphous and conventional steel fibers having the same amount were used together. Based on the test results, it was found that the use of 15% latex weight fraction could result in the very early development of concrete compressive strength at the seventh day; the ratio between the concrete compressive strengths at the seventh and 28th days was approximately 91%. The use of a 0.3% fiber volume fraction presented a higher concrete compressive strength at the seventh day than that of a 0.2% fiber volume fraction. In addition, the increase of the latex weight fraction up to 20% increased the flexural strength, and the increase of the fiber volume fraction up to 0.3% also increased the flexural strength. Moreover, using a high amount of latex could delay the crack development time while the final crack width was almost the same. The addition of latex and fibers into the concrete matrix also resulted in excellent resistances of permeability and freeze-thaw cycles.

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Evaluation of Early-Age Concrete Compressive Strength with Ultrasonic Sensors

Cited by 30 publications

References 22 publications

Evaluation of the Effect of Fly Ash on Hydration Characterization in Self-Compacting Concrete (SCC) at Very Early Ages Using Piezoceramic Transducers

Evaluation of the Effect of Fly Ash on Hydration Characterization in Self-Compacting Concrete (SCC) at Very Early Ages Using Piezoceramic Transducers

Piezoceramic-Based Damage Monitoring of Concrete Structure for Underwater Blasting

Mechanical Performance and Durability of Latex-Modified Fiber-Reinforced Concrete

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