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Title:

Field Use of Accelerating and Retarding Admixtures in Prequalified Concrete Mixtures: Extended Abstract

Accession Number:

01661490

Record Type:

Component

Abstract:

Seven ready-mixed concrete suppliers produced a total of 42 concrete mixtures with and without mineral admixtures (class C and F fly ash and slag cement) to determine the effect of non-chloride accelerating and retarding admixtures on concrete permeability and compressive strength. The goal of the research was to determine what dosages of these admixtures should be used during qualification of the mixtures since they frequently change during the course of production as environmental conditions change. The mixtures selected were previously qualified for use in either pavements or bridge decks in the state of Kansas. Permeability testing included ASTM C642 (voids in hardened concrete), AASHTO TP95 (surface resistivity), and ASTM C1202 (rapid chloride permeability), and compressive strength was conducted in accordance with ASTM C39. Results showed that for the majority of mixtures, the addition of a retarder did not negatively influence the permeability or compressive strength. As a result, retarders should not be included in qualification batches and only added during production as conditions warrant. Mixtures incorporating a retarder during qualification may see a reduction in performance if that dosage is reduced during production. Non-chloride accelerators had a larger effect on the 100% portland cement mixtures compared to those containing a mineral admixture, but there were several instances where the addition of an accelerator resulted in a reduction in permeability or compressive strength or both. As a result, accelerators should be included in qualification batches with reduced dosages permitted during production.

Supplemental Notes:

This paper was sponsored by TRB committee AFN40 Standing Committee on Concrete Materials and Placement Techniques.

Report/Paper Numbers:

18-03197

Language:

English

Authors:

Lindquist, Will

Pagination:

7p

Publication Date:

2018

Conference:

Transportation Research Board 97th Annual Meeting

Location: Washington DC, United States
Date: 2018-1-7 to 2018-1-11
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Geographic Terms:

Kansas

Subject Areas:

Highways; Materials; Pavements

Source Data:

Transportation Research Board Annual Meeting 2018 Paper #18-03197

Files:

TRIS, TRB, ATRI

Created Date:

Jan 8 2018 10:46AM