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Title:

Benefits of Portland-Limestone Cement for Concrete with Rounded Gravel Aggregates and Higher Fly Ash Replacement Rates
Cover of Benefits of Portland-Limestone Cement for Concrete with Rounded Gravel Aggregates and Higher Fly Ash Replacement Rates

Accession Number:

01555200

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Recently, portland-limestone cement (PLC) has garnered increased interest in the US due to potentially greater environmental sustainability and enhancement of certain concrete properties and/or performance. Combined with supplementary cementitious materials (SCMs), these benefits can be further extended. This paper builds on past works of the authors, tailored to Mississippi’s current concrete practices, by evaluating concrete mixtures with rounded gravel aggregates and greater replacement of cement with SCMs (primarily fly ash). In total, 15 different cementitious combinations were used in concrete and cement paste mixtures. Concrete specimens from 30 mixtures (360 specimens) were tested, featuring various combinations of cements, SCMs, and admixtures. Replicates of these 30 mixtures were created in cement paste mixtures (540 specimens). Major variables included SCM type, replacement rate, and cement source. Mixtures were tested for compressive strength, time of setting or thermal setting indication, and slump and air content, in the case of concrete mixtures. A small subsection of concrete mixtures was also examined using petrography. Results indicated that use of PLC vs. ordinary portland cement (OPC) resulted in notable compressive strength improvements in mixtures with high Class C fly ash replacement (especially 40%). Slump and air content were not statistically different in PLC vs. OPC mixtures; however time of setting was lower in mixtures with PLC. Hydration-related distinctions (PLC vs. OPC mixtures) were evident in petrographic images, with some observed differences in cement paste character and the paste-to-aggregate interfacial transition zone (ITZ).

Supplemental Notes:

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

Monograph Accession #:

01550057

Report/Paper Numbers:

15-4049

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Shannon, Jay
Howard, Isaac L
Cost, V Tim

Pagination:

17p

Publication Date:

2015

Conference:

Transportation Research Board 94th Annual Meeting

Location: Washington DC, United States
Date: 2015-1-11 to 2015-1-15
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Uncontrolled Terms:

Portland limestone cement

Geographic Terms:

Mississippi

Subject Areas:

Highways; Materials; Pavements; I32: Concrete; I35: Miscellaneous Materials; I36: Aggregates

Source Data:

Transportation Research Board Annual Meeting 2015 Paper #15-4049

Files:

PRP, TRIS, TRB, ATRI

Created Date:

Dec 30 2014 1:19PM