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Jun, Yubin
Construction Materials Lab
Research Interests
  • Construction materials
  • Concrete deterioration and durability

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Influence of the structural modification of polycarboxylate copolymer with a low dispersing ability on the set-retarding of Portland cement

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Title
Influence of the structural modification of polycarboxylate copolymer with a low dispersing ability on the set-retarding of Portland cement
Author
Jun, YubinJeong, YeonungOh, Jae EunPark, JongnamHa, Ju-hyungSohn, Seok Gyu
Issue Date
2015-09
Publisher
대한토목학회
Citation
KSCE JOURNAL OF CIVIL ENGINEERING, v.19, no.6, pp.1787 - 1794
Abstract
Two structurally modified polycarboxylate (PC) copolymers were synthesized to explore the influence of structural modification with these polymers on the set-retarding of Portland cement. The dispersion ability of these polymers was eliminated by introducing very short graft side chains. The synthesized copolymer structures were verified by FTIR, GPC and 1H NMR analyses. The initial and final setting times, polymer adsorption capability, strength development, paste fluidity, and XRD of hardened pastes were tested. The test results indicate that the PC copolymers do not increase the cement paste fluidity due to their short graft side chain length, while a significant set-retarding effect is observed when the polymer structure is highly anionic, with the set-retarding effect increasing linearly with polymer dosage up to 1%. The adsorption of copolymer on cement grains rapidly reaches saturation within 5 minutes after mixing for both polymers. Adding these PC copolymers does not noticeably change the early strength development, although the polymers selectively affect the hydration behavior of C3S and C2S at very early ages. Early hydration of groups, such as C3S, C2S, C3A and C4AF, is not likely to be significantly involved in the mechanism by which carboxylate copolymers with very short graft chains delay cement setting.
URI
https://scholarworks.unist.ac.kr/handle/201301/11301
URL
http://link.springer.com/article/10.1007%2Fs12205-014-1189-4
DOI
10.1007/s12205-014-1189-4
ISSN
1976-3808
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UEE_Journal Papers
BME_Journal Papers
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