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Title:

Atomic Force Microscopy Examinations of Mortar Made by Using Water-Filled Lightweight Aggregate

Accession Number:

01157598

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States
Order URL: http://www.trb.org/Main/Blurbs/Nanotec...Cement_and_Concrete_Volume_1_163581.aspx

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Order URL: http://worldcat.org/isbn/9780309142762

Abstract:

This paper discusses the results of a research program that studied the influence of internal curing on the microstructure of mortars. Internal curing uses water-filled lightweight aggregates (LWAs) to supply additional water to the cement paste as it hydrates, thereby enabling an increase in the degree of hydration. The increased hydration can result in the densification of the microstructure. In particular, the densification occurs at the interfacial zone around the LWAs. The current work attempts to obtain a better understanding of the beneficial effects of internal curing on the basis of experimental observations of the microstructure and the nanostructure. The objective of this study was to examine the differences and the similarities that exist at both the microscale and the nanoscale of conventionally cured mortars and internally cured mortars. The specimens were tested at different ages to examine the influences of the internal curing over time. Water sorption, scanning electron microscopy, and scanning atomic force microscopy were used for this study. It was found that LWAs can be used for internal curing to provide a greater degree of hydration in a small region around the aggregate interface, which results in a microstructure that is more dense and more homogeneous and that contains less calcium hydroxide.

Monograph Accession #:

01157583

Report/Paper Numbers:

NANO10-0045

Language:

English

Authors:

Peled, Alva
Castro, Javier
Weiss, Jason

Pagination:

pp 92-101

Publication Date:

2010

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Issue Number: 2141
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

9780309142762

Media Type:

Print

Features:

Figures (9) ; References (16) ; Tables (1)

Subject Areas:

Materials; I32: Concrete

Files:

TRIS, TRB, ATRI

Created Date:

May 26 2010 11:31AM

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