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Title:

Influence of Fine Particles on Strength and Autogenous Shrinkage of Alkali-Activated Slag Pastes

Accession Number:

01628826

Record Type:

Component

Abstract:

Concrete industry has explored various options to reduce the usage of ordinary portland cement (OPC) in concrete by finding suitable replacement materials. Alkali activation of alumino-silicate materials as cement free binders for concrete is a promising alternative to the use of portland cement. The objective of the present study was to determine the role of different types of fine particles on the compressive strength, workability, setting time, reaction kinetics and autogenous shrinkage of the alkali activated slag cement. Sodium silicate and sodium hydroxide were used as the alkaline solutions for activating the slag cement. Nano silica, kaolinite clay and slightly modified kaolinite clay, referred to as coated clay, were used as the fine particles. The amount of fine particle used was 1% and 2% of the binder mass. Reaction kinetic of the pastes was evaluated using an in-situ isothermal conduction calorimetry. The fine particle addition significantly increased the compressive strength of the sodium silicate activated slag cement. Whereas, the workability, setting time and autogenous shrinkages were significantly reduced due to fine particle addition in the sodium silicate activated slag system. An entirely different behavior was obtained when the fine particles were added to a sodium hydroxide activated slag system. The compressive strength and autogenous shrinkage were not significantly affected by the fine particle addition in the sodium hydroxide activated slag. Nano silica was the most reactive fine particle irrespective of the type of activator used.

Supplemental Notes:

This paper was sponsored by TRB committee AFN10 Standing Committee on Basic Research and Emerging Technologies Related to Concrete. Alternate title: Influence of Fine Particle on Strength and Autogenous Shrinkage of Alkali-Activated Slag Pastes.

Monograph Accession #:

01618707

Report/Paper Numbers:

17-05184

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Chandrasiri, Chathurani
Peethamparan, Sulapha

Pagination:

14p

Publication Date:

2017

Conference:

Transportation Research Board 96th Annual Meeting

Location: Washington DC, United States
Date: 2017-1-8 to 2017-1-12
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Subject Areas:

Highways; Materials

Source Data:

Transportation Research Board Annual Meeting 2017 Paper #17-05184

Files:

TRIS, TRB, ATRI

Created Date:

Dec 8 2016 12:01PM