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Study on Characteristics of Controlled Low Strength Material Using Time Domain Reflectometry
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 Title & Authors
Study on Characteristics of Controlled Low Strength Material Using Time Domain Reflectometry
Han, Woojin; Lee, Jong-Sub; Byun, Yong-Hoon; Cho, Samdeok; Kim, Juhyong;
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The hydration process of Controlled Low Strength Material (CLSM) used for backfill is the primary factor to determine the construction period. The objective of this study is to monitor the hydration process of CLSM using the Time Domain Reflectometry (TDR) and to establish the relationship between dielectric constant and compressive strength. The CLSM specimen is composed of cement, flyash, silt, sand, accelerator, and water. The material characteristics of the CLSM including flow, unit weight, compressive strength are investigated. To measure the dielectric constant of the CLSM during the curing time, TDR probe incorporated with a mold and a reflectometer are used. Experimental results show that the dielectric constant remains constant at early stage, and then decreases as the curing time increases. In addition, the dielectric constant is related to the compressive strength in inverse power function. This paper suggests that the TDR technique may be used as a non-destructive testing method in order to estimate the compressive strength of the CLSM mixture under construction.
Curing time;Controlled low strength material;Dielectric constant;Uniaxial compressive strength;
 Cited by
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