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Title |
Effect of Internal Curing by Super-Absorbent Polymer (SAP) on Hydration, Autogenous Shrinkage, Durability and Mechanical Characteristics of Ultra-High Performance Concrete (UHPC)
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Authors |
강성훈(Sung-Hoon Kang) ; 문주혁(Juhyuk Moon) ; 홍성걸(Sung-Gul Hong) |
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DOI |
http://dx.doi.org/10.4334/JKCI.2016.28.3.317 |
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Keywords |
Super-absorbent polymer (SAP) ; internal curing ; water-entraining agent ; Ultra-high performance concrete (UHPC) ; autogenous shrinkage |
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Abstract |
This research intends to understand the impact of super-absorbent polymer (SAP) as an internal curing agent in Ultra-High Performance Concrete (UHPC). Two different types of SAPs of acrylic acid (SAP_AA) and acrylic acid-co-acrylamide (SAP_AM) were examined with UHPC formulation. Isothermal calorimetry and x-ray diffraction experiments revealed the impact of polymers with the different chemical bonds on cement hydration. To test its feasibility as a shrinkage reducing admixture for UHPC, a series of experiments including flowability, compressive strength, rapid chloride permeability and autogenous shrinkage profile was performed. While both SAPs showed a reduction in autogenous shrinkage, it has been concluded that the SAP size and chemical form significantly affect the performance as an internal curing agent in UHPC by controlling cement hydration and porosity modification. Between the tested SAPs, SAP_AM which absorbs more water in UHPC than SAP_AA, shows better mechanical and durability performance.
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