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http://dx.doi.org/10.4334/JKCI.2011.23.3.295

Autogeneous Shrinkage Characteristics of Ultra High Performance Concrete  

Kim, Sung-Wook (Structural Engineering & Bridges Research Division Infrastructure Research Dept., Korea Institute of Construction Technology)
Choi, Sung (Technology Research Center, Tong Yang Major Corporation)
Lee, Kwang-Myong (Dept. of Civil and Environmental Engineering System, Sungkyunkwan University)
Park, Jung-Jun (Structural Engineering & Bridges Research Division Infrastructure Research Dept., Korea Institute of Construction Technology)
Publication Information
Journal of the Korea Concrete Institute / v.23, no.3, 2011 , pp. 295-301 More about this Journal
Abstract
Recently, the use of UHPC made of superplasticizers, silica fume, and steel fibers has been increasing worldwide. Although UHPC has a very high strength as well as an excellent durability performance due to its dense microstructures, earlyage cracks may occur due to the high heat of hydration and autogenous shrinkage caused by low W/B and high unit cement content. The early-age shrinkage cracking of UHPC can be controlled by using the shrinkage reducers and expansive admixtures having autogenous shrinkage compensation effect. In this paper, ultrasonic pulse velocity of UHPC containing shrinkage reducers and expansive agents was measured to predict its stiffness change. Also, the effect of shrinkage reducers and expansive agents on the autogenous shinkage of UHPC was investigated through the shrinkage test of UHPC specimens. Furthermore, the material coefficients of autogenous shrinkage prediction model were determined using the autogenous shrinkage values of UHPC with age. Consequently, the test results showed that, by adding shrinkage reducers and expansive agents, the stiffness of UHPC was rapidly developed at early-ages and the autogenous shrinkage was considerably reduced.
Keywords
ultra high performance concrete; autogenous shrinkage; ultrasonic pulse velocity; shrinkage reducer; expansive admixture;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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