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http://dx.doi.org/10.12814/jkgss.2021.20.4.133

Experimental Study on Evaluating Early-age Strength and Stiffness Characteristics of Controlled Low Strength Material  

Son, Dong Geon (School of Agricultural Civil & Bio-Industrial Engineering, Kyungpook National Univ.)
Jeong, In Up (School of Agricultural Civil & Bio-Industrial Engineering, Kyungpook National Univ.)
Kim, Dong-Ju (School of Civil, Environmental and Architectural Engineering, Korea Univ.)
Byun, Yong-Hoon (School of Agricultural Civil & Bio-Industrial Engineering, Kyungpook National Univ.)
Publication Information
Journal of the Korean Geosynthetics Society / v.20, no.4, 2021 , pp. 133-140 More about this Journal
Abstract
There are few attempts to estimate the strength and stiffness of controlled low strength material (CLSM) using existing field-testing methods. The objective of this study is to evaluate the resilient modulus of CLSM by using the Light Weight Deflectometer (LWD) and investigate the relationships between the resilient modulus from LWD and the unconfined compressive strength (UCS) and secant modulus of elasticity from unconfined compressive test. Five CLSMs with different mix designs are used to evaluate the flowability and the stiffening of the CLSM in the flow and Vicat needle tests, respectively. To evaluate the early strength and stiffness characteristics, unconfined compressive tests are performed using the CLSM specimens cured for 1 and 7 days. LWD tests are carried out to estimate the resilient modulus of the CLSM specimens. The experimental results show that for the curing time of 1 day, the UCS and secant modulus of elasticity generally increase with the fast setting mortar content (FC). The CLSM specimen with the highest FC shows the significant increase in the UCS and secant modulus of elasticity along the curing time. Overall, the resilient modulus for the curing time of 1 day increases with the FC, while that for the curing time of 7days decreases with an increase in the FC. From the results, the linear relationships between the resilient modulus and UCS and secant modulus of elasticity are established.
Keywords
CLSM; Early-age properties; LWD; strength; stiffness;
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