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Title:

Potential Issues with Generation and Stability of Air-Void System due to Incompatibility of Components in Plain and Fly Ash Cementitious Mixtures
Cover of Potential Issues with Generation and Stability of Air-Void System due to Incompatibility of Components in Plain and Fly Ash Cementitious Mixtures

Accession Number:

01478747

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Continuing desire to create more sustainable and durable infrastructure leads to the increased usage of various mineral and chemical admixtures as components of present-day concrete mixtures. Unexpected incompatibility problems may arise in certain mixtures as a result of complex interactions that frequently take place between these components. This paper presents an investigation on identifying combinations of component materials which can result in problems related to generation and stability of air-void system (AVS) in both plain and fly ash mixtures. A low (0.3%) alkali Type I cement, a class F fly ash and four chemical admixtures were used in this study. Two out of these four admixtures included different types of air entraining agents (AEA): a) vinsol resin based air entraining agent and b) synthetic type air entraining agent. The other two admixtures included the lignin based Type A water reducing agent (WRA) and polycarboxylate type superplasticizer. In addition to plain cementitious mixtures prepared from various combinations of these components, fly ash mixtures (with 20 and 60% weight replacement of cement by Class F fly) were also studied. The potential degree of difficulty in generating air-voids in fresh concrete was evaluated using the foam index tests (performed on paste slurries) and by measuring the air content of mortar mixtures (performed according to the AASHTO T137). Stability of air-void system in concretes was evaluated using the foam drainage test (performed on paste slurries). The results showed that the amount of the AEA required to obtain the target air percentage increased with the increase in the fly ash content in the mixture. The lignin based WRA had, in general, a higher air entraining effect than the super-plasticizer when used in combination with air entrainers. In general mixtures prepared with synthetic air entraining agent exhibited more stable foam system than mixtures prepared with vinsol resin based air entraining agent.

Supplemental Notes:

This paper was sponsored by TRB committee AFN30 Durability of Concrete.

Monograph Accession #:

01470560

Report/Paper Numbers:

13-4537

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Paleti, Chaitanya
Olek, Jan
Nantung, Tommy E

Pagination:

19p

Publication Date:

2013

Conference:

Transportation Research Board 92nd Annual Meeting

Location: Washington DC, United States
Date: 2013-1-13 to 2013-1-17
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Subject Areas:

Highways; Materials; I32: Concrete

Source Data:

Transportation Research Board Annual Meeting 2013 Paper #13-4537

Files:

PRP, TRIS, TRB, ATRI

Created Date:

Feb 5 2013 12:52PM