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http://dx.doi.org/10.14190/JRCR.2016.4.3.292

Method of Decreasing Cracking Index by Different Mix Conditions for Separated Placement and its Field Application  

Kim, Min-Ho (Department of Architectural Engineering, Cheongju University)
Han, Cheon-Goo (Department of Architectural Engineering, Cheongju University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.4, no.3, 2016 , pp. 292-298 More about this Journal
Abstract
In this research, considering the practical situation of separated placing method for mass concrete structure, an efficient method of controlling the heat of hydration is suggested by comparing between the simulated values and actual measurements conducted with the optimum mix design obtained from the various mix conditions with different types and amount of supplementary cementitious materials(SCMs). As the result of the research, firstly, the optimum mix designs for top and bottom layers were determined by Midas gen as OPC to FA of 85 to 15, and OPC to FA to BS of 50 to 20 to 30, respectively. The concrete mixtures prepared with the mix designs determined from the simulation satisfied the target performance range in slump, air content and compressive strength. Additionally, from temperature measurement for the actual mass concrete placed during spring, the maximum temperature difference between surface and core was about $10^{\circ}C$ with 59 and $49^{\circ}C$ for top and bottom layers, respectively, and 1.4 of cracking index was obtained. Therefore, considering the practical conditions of mass concrete construction, it is considered that the different heat of hydration method using different mix designs with SCMs can be an efficient method for controlling thermal cracking and settling cracking of mass concrete.
Keywords
High volume supplementary cementitious materials; Thermal cracking; Mass concrete; Heat of hydration analysis;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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