An amphoteric hydrogel

Synthesis and application as an internal curing agent of concrete

Xin Yi Liu, Chang Hsiang Huang, Ching Hsiang Zhuang, Kung-Chung Hsu, Chung Ho Huang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A new crosslinked amphoteric hydrogel (PAC) was synthesized and evaluated as an internal curing agent of concrete. PAC was prepared from acrylamide (AM) and 4-(2-((carboxylatomethyl)dimethylammonio)ethoxy)-4-oxobut-2-enoate (CMD) through free-radical polymerization by using ammonium persulfate (APS) as an initiator and methylene-bisacrylamide (MBA) as a crosslinker. The structure of the prepared polymer was verified by the IR spectra. The effects of the polymerization variables on the swelling capacity of PAC were investigated. The water absorbency of PAC was found to increase with increasing CMD/AM ratio, reach a maximum value, and decrease afterword. Increase of either APS or MBA content decreased the water absorbency. The highest water absorbency of PAC hydrogel (P7) achieved in deionized water, 0.1M NaCl solutions and 0.1M CaCl 2 solutions, was 306 g/g, 32 g/g, and 22 g/g, respectively. Compared with a commercial acrylate-based hydrogel 283HA, P7 was less sensitive to the existence of Ca 2+ ions in cement pore solutions, and more effective in reducing the cracking tendency of cement pastes. Finally, mortars incorporated with proper amounts of P7 showed smaller drying shrinkage and higher compressive strength than that without hydrogel present.

Original languageEnglish
Article number42175
JournalJournal of Applied Polymer Science
Volume132
Issue number26
DOIs
Publication statusPublished - 2015 Jul 1

Fingerprint

Hydrogel
Hydrogels
Curing
Concretes
Ammonium persulfate
Acrylamide
Water
Cements
Deionized water
Free radical polymerization
Ointments
Mortar
Compressive strength
Swelling
Drying
Polymers
Polymerization
Ions
ammonium peroxydisulfate
N,N'-methylenebisacrylamide

Keywords

  • amphoteric hydrogel
  • applications
  • swelling
  • synthesis and processing

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

Cite this

An amphoteric hydrogel : Synthesis and application as an internal curing agent of concrete. / Liu, Xin Yi; Huang, Chang Hsiang; Zhuang, Ching Hsiang; Hsu, Kung-Chung; Huang, Chung Ho.

In: Journal of Applied Polymer Science, Vol. 132, No. 26, 42175, 01.07.2015.

Research output: Contribution to journalArticle

Liu, Xin Yi ; Huang, Chang Hsiang ; Zhuang, Ching Hsiang ; Hsu, Kung-Chung ; Huang, Chung Ho. / An amphoteric hydrogel : Synthesis and application as an internal curing agent of concrete. In: Journal of Applied Polymer Science. 2015 ; Vol. 132, No. 26.
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