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A Study of Low Porosity Polymerized β-C2S Paste

Published online by Cambridge University Press:  21 February 2011

Lu Ping ,
Zhao Jing  and
Shen Wei
Lu Ping
Affiliation:
Department of Materials Science and Engineering, Tongji University, Shanghai 200092, China
Zhao Jing
Affiliation:
Department of Materials Science and Engineering, Tongji University, Shanghai 200092, China
Shen Wei
Affiliation:
Department of Materials Science and Engineering, Tongji University, Shanghai 200092, China
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Abstract

In this paper an active β-C2S was used to prepare compacted and polymerized pastes with low porosity. X-ray diffraction (XRD), mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM), and tri-methy silanation-gel permeation chromatography (TMS-GPC) techniques were used to characterize the microstructure of the pastes both before and after additions of inorganic complexing ions, Fe2+ and Ni2+, and organic silane VTES.

The results indicate that both inorganic complexing ions and organic silane can play a role in the polymerization of the native silicate anions in the cement pastes. These materials lead to a distinct increase of pentamer, octamer, and polymer components in the pastes, resulting in a decrease in the average C/S ratio in the C-S-H phase. The samples obtained from this processing have very high mechanical strengths, up to a compressive strength of 316 MPa, and fracture surface energy of 43 J/m2.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 179: Symposium Y – Specialty Cements with Advanced Properties , 1989 , 235
Copyright
Copyright © Materials Research Society 1991

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