Study on Correlation between Compressive Strength and Compressional Wave Velocity for CLSM According to Curing Time

Han, Woo Jin; Lee, Jong-Sub; Cho, Sam-Deok; Kim, Jinhwan; Byun, Yong-Hoon

doi:10.14481/jkges.2015.16.11.5

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…Various testing methods for evaluating the engineering properties of CLSM have been studied [11][12][13][14][15]. Han et al [11] investigated the relationship between the unconfined compressive strength (UCS) of CLSM and compressional wave velocity estimated from using ultrasonic transducers. To overcome the limits of the ultrasonic wave velocity method based on the compressional wave, embedded piezoelectric transducers were used [12,13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Fly Ash on Strength and Stiffness Characteristics of Controlled Low-Strength Material in Shear Wave Monitoring

Kim

Byun

2021

Materials

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Fly ash, the main component for controlled low-strength material (CLSM), has physical and chemical characteristics according to the resources used in the thermal power plant, and thus fly ash type can influence the physical and strength properties of CLSM. This study investigates the effect of fly ash type on the engineering properties of CLSM and establishes relationships between mechanical properties of CLSM and shear wave velocity (SWV) for long curing times. Six fly ashes with different physical properties and chemical components are used for preparing the CLSM mixtures. The air content, unit weight, flowability, and setting time of CLSM are measured. Unconfined compressive strength (UCS) and elastic modulus (E) are obtained from unconfined compressive tests, and SWV (Vs) is determined using a bender element-based wave measurement system. Experimental results show that the stiffness and strength characteristics of CLSM are relevant to the contents of two oxides (SiO2 and Al2O3) and the fineness of fly ash. Because the evolution of SWV is influenced by the fly ash type, the relationships UCS-Vs and E-Vs are well established. Thus, considering the fly ash type, shear wave monitoring may be effectively used for estimating strength and stiffness characteristics of CLSM.

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Section: Introductionmentioning

confidence: 99%

Effect of Fly Ash on Strength and Stiffness Characteristics of Controlled Low-Strength Material in Shear Wave Monitoring

Kim

Byun

2021

Materials

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“…Ultrasonic testing methods are widely used to evaluate the characteristics of hardened cementitious materials without any damage to specimens [5,6]. However, monitoring the early hardening process of cementitious materials is difficult, because transducers require adequate contact pressure.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of elastic waves passing through a flowable fill at early age

2019

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Elastic waves obtained from transducers are widely used to monitor the strength and integrity of cementitious materials. A pair of bender elements (BEs) and piezo disk elements (PDEs) embedded in a cuboid mould are applied to monitor elastic waves passing through a cementitious material known as a flowable fill at early age. The flowable fills used in this study are mixed with calcium sulfoaluminate cement, sand, silt, fly ash, water, and an accelerator. Compressional and shear waves acquired from the PDEs and BEs, respectively, are observed for up to 72 hrs. Results show that the compressional and shear wave velocities increased with curing time. The sensors can be used effectively to monitor the hardening characteristics of flowable fills at early age, and the BEs are particularly suitable for evaluating the hardening conditions of flowable fills as a result of the wide variation in shear wave velocities.

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