Optimization of the Structural Parameters and Properties of PCE Based on the Length of Grafted Side Chain

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Optimization of the Structural Parameters and Properties of PCE Based on the Length of Grafted Side Chain

Author(s): Zi-Ming Wang, Zi-Chen Lu, and Xiao Liu

Publication: Special Publication

Volume: 302

Issue:

Appears on pages(s): 265-278

Keywords: PCE; IPEG; backbone; side chain; structural parameters

Date: 6/1/2015

Abstract:
A series of polycarboxylic ether (PCE) superplasticizers were copolymerized through acrylic acid (AA) and isobutylene polyethylene glycol (IPEG) with different molecular weight (500, 1000, 1500, 2000, 2400 and 2700). The molecular weight, molecular weight distribution and reaction ratio were measured by gel permeation chromatography (GPC). The initial fluidity and flow retaining ability were evaluated through mini slump test at the same dosage (by mole and by weight). The results indicated that the dispersing capability of single PCE molecule firstly improved with the increase of backbone length, and then decreased after reaching a critical value. Both the appropriate backbone length and side chain density of PCE were affected significantly by the side chain length. In general, PCE with longer side chain, shorter backbone length and lower side chain density are appropriate to achieve better comprehensive properties. Finally, regression equations were proposed to predict the suitable backbone length and proper side chain density of PCE based on the length of grafted side chain.