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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received June 30, 2014
Accepted October 5, 2014

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Application of cross-linked poly(acrylic acid)-poly(styrene-alt-maleic anhydride) core-shell microcapsule absorbents in cement mortars

Kiseob Hwang Seoksoo Jang¹ Yongwook Jung¹ Seunghan Lee¹ Jun-Young Lee KiRyong Ha^2†

Korea Institute of Industrial Technology, Seobuk-gu, Cheonan-si, Chungcheongnam-do 331-822, Korea ¹Department of Civil Engineering, Keimyung University, Dalseo-gu, Daegu 704-701, Korea ²Department of Chemical Engineering, Keimyung University, Dalseo-gu, Daegu 704-701, Korea

Korean Journal of Chemical Engineering, June 2015, 32(6), 1170-1177(8), 10.1007/s11814-014-0302-1

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Abstract

We synthesized core-shell microcapsule absorbents with crosslinked poly(acrylic acid) (PAA) as the core and poly(styrene-alt-maleic anhydride) (cPAA-PSMA) as the shell by the precipitation polymerization method for delayed absorption of excess water in cement mortar. To control the shell thickness, cPAA-PSMA capsules were synthesized with the core-to-shell monomer mass ratios of 1 : 0 (cPAA #1), 1 : 0.5 (cPAA-PSMA #2), 1 : 1 (cPAA-PSMA #3), and 1 : 1.5 (cPAA-PSMA #4). The viscosity of the cement paste with cPAA-PSMA #4 absorbent increased slowly until 90minutes after absorbent addition, beyond which it increased rapidly. This suggests that mortars with cPAA-PSMA #4 absorbents can secure up to 90 minutes of working time. Incorporation of 1.0 wt% cPAA-PSMA #4 into cement mortar increased the compressive and flexural strengths by approximately 35% and 22%, respectively, compared to those of cement mortars without absorbents.

Keywords

cPAA-PSMA Microcapsule Absorbent E. Mortar C. Ccompressive Strength

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