Browse > Article
http://dx.doi.org/10.14190/JRCR.2020.8.1.88

Effect of Cyclic Wetting-drying on Self-healing of Cementitious Materials Containing Superabsorbent Polymers  

Hong, Geuntae (Department of Civil and Environmental Engineering, Chung-Ang University)
Choi, Seongcheol (Department of Civil and Environmental Engineering, Chung-Ang University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.8, no.1, 2020 , pp. 88-96 More about this Journal
Abstract
In this study, the effect of cyclic wetting-drying on the self-healing of cementitious materials containing superabsorbent polymers (SAPs) were experimentally evaluated. In each cycle, cracked cement paste specimens containing various SAP dosages were exposed to wet conditions for 1 h, during which the capillary water absorption tests and water flow tests were conducted, and then exposed to dry conditions for 47 h. The capillary water absorption test results showed that the sorptivity values of the specimen without SAPs, SAP 0.5%, SAP 1.0%, and SAP 1.5% specimens were decreased by approximately 22.9%, 36.8%, 42.8%, and 46.3%, respectively, after 8 cycles. In addition, the water flow test results showed that the amount of water runoff through the cracks of all cracked specimens gradually decreased over wet/dry cycles, especially the reduction ratio of the amount of water runoff increased with increasing SAP dosage. Furthermore, the swelling behavior of SAPs in cracks by in gress water was con firmed via X-ray computed tomography (CT) analysis. These results indicate that the effective crack width can be reduced as SAPs absorb water and swell, while the water absorbed in SAPs can be released to crack surfaces under dry conditions, further promoting healing product formation. This study demon strates that the in corporation of SAPs can in crease the water tightness of cracks, thereby improving the self-healing efficiency of cementitious materials.
Keywords
Crack; Self-healing; Superabsorbent polymer(SAP); Water tightness; Wetting-drying;
Citations & Related Records
연도 인용수 순위
  • Reference
1 ASTM C1585. (2004). Test Methods for Measurement of Rate of Absorption of Water by Hydraulic Cement Concretes, ASTM International, PA, USA.
2 Hong, G.T., Choi, S.C. (2017). Rapid self-sealing of cracks in cementitious materials incorporating superabsorbent polymers, Construction and Building Materials, 143, 366-375.   DOI
3 Hong, G.T., Choi, S.C. (2018). Modeling rapid self-sealing of cracks in cementitious materials using superabsorbent polymers, Construction and Building Materials, 164, 570-578.   DOI
4 Hong, G.T., Song, C.W., Choi, S.C. (2020). Autogenous healing of early-age cracks in cementitious materials by superabsorbent polymers, Materials 13(3), 690.   DOI
5 Hong, G.T., Song, C.W., Park, J.S., Choi, S.C. (2019). Hysteretic behavior of rapid self-sealing of cracks in cementitious materials incorporating superabsorbent polymers, Construction and Building Materials, 195, 187-197.   DOI
6 Huang, H., Ye, G., Damidot, D. (2013). Characterization and quantification of self-healing behaviors of microcracks due to further hydration in cement paste, Cement and Concrete Research, 52, 71-81.   DOI
7 Jensen, O.M., Hansen, P.F. (2001). Water-entrained cement-based materials: I. Principles and theoretical background, Cement and Concrete Research, 31(4), 647-654.   DOI
8 Kim, D.J., Park, K.N. (2004). Swelling and mechanical properties of superporous hydrogels of poly(acrylamide-co-acrylic acid)/polyethylenimine interpenetrating polymer networks, Polymer, 45(1), 189-196.   DOI
9 Mechtcherine, V., Reinhardt, H.W. (2012). Application of super absorbent polymers (SAP) in concrete construction, State-of-the-art Report of the RILEM TC 225-SAP, Springer, Heidelberg, Germany.
10 Monnig, S., Lura, P. (2007). Superabsorbent polymers-an additive to increase the freeze-thaw resistance of high strength concrete, C.U. Grosse (Ed.), Advances in Construction Materials, Berlin Heidelberg, Berlin, 351-358.
11 Peppas, N.A., Bures, P., Leobandung, W.S., Ichikawa, H. (2000). Hydrogels in pharmaceutical formulations, European Journal of Pharmaceutics and Biopharmaceutics, 50(1), 27-46.   DOI
12 Shim, Y.W., Hong, G.T., Choi, S.C. (2018). Autogenous Healing of Early-Age Cementitious Materials Incorporating Superabsorbent Polymers Exposed to Wet/Dry Cycles, Materials, 11(12), 2476.   DOI
13 Springenschmid, R. (1998). Prevention of Thermal Cracking in Concrete at Early Ages, E&FN Spon: New York, USA.