Research on the Microstructure Formation of Polyacrylate Latex Modified Mortars

Abstract

The microstructure forming process of polyacrylate (PA) latex modified cement-based materials was investigated from mixing to hardening. Owing to the chemical reaction between PA particles and calcium ions in the pore solution, PA polymer will not uniformly disperse in cement mortar due to its adsorption on cement particles or hydrates. As a result, PA polymer should exist in cement mortars through different morphologies. The early age mechanical properties of PA modified mortars are lower than those of unmodified mortars, while a rapid progress of the compressive strength and fracture energy can be recognized from the PA modified mortars. It was found that PA polymer addition will refine the small pores but induce big pores to cement mortar. SEM and EDX analysis proves that PA polymer is localized at some places within PA modified mortar which can be named as the localization of polymer modification. The physical and chemical influence of PA polymer on cement-based materials was integrated into an improved model.

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Cement Based Material; Cement Mortars; Cement Particles; Microstructure Formation; Polyacrylate Latices; Polymer Latices; Polymer Modifications; Polymer Modified Mortar; Cements; Compressive Strength; Hydrates; Latexes; Mechanical Properties; Microstructure; Mortar; Surface Active Agents; Polymers; Mechanism of polymer modification; Polymer latex; Surfactant

International Standard Serial Number (ISSN)

0950-0618

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2013 Elsevier, All rights reserved.

Publication Date

01 Oct 2013

Link to Full Text

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