Applying high resolution SyXRD analysis on sulfate attacked concrete field samples

Journal Article · Mon Dec 15 04:00:00 EST 2014 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2014.07.015· OSTI ID:22395931

Stroh, J. ^[1]; Schlegel, M. -C. ^[1]; Irassar, E. F. ^[2]; Meng, B. ^[1]

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1. BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Straße 11, 12489 Berlin (Germany)
2. Department of Civil Engineering, National University of Buenos Aires Center State, Avenida Del Valle 5737, B7400JWI Olavarría (Argentina)

High resolution synchrotron X-ray diffraction (SyXRD) was applied for a microstructural profile analysis of concrete deterioration after sulfate attack. The cement matrices consist of ordinary Portland cement and different amounts of supplementary cementitious materials, such as fly ash, natural pozzolana and granulated blast furnace slag. The changes of the phase composition were determined along the direction of sulfate ingress. This approach allows the identification of reaction fronts and zones of different phase compositions and conclusions about the mechanisms of sulfate attack. Two reaction fronts were localized in the initial 4 mm from the sample surface. The mechanism of deterioration caused by the exposition in the sulfate-bearing soil is discussed. SyXRD is shown to be a reliable method for investigation of cementitious materials with aggregates embedded in natural environments.

• OSTI ID: 22395931
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Vol. 66; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BLAST FURNACES
CONCRETES
MICROSTRUCTURE
PORTLAND CEMENT
SLAGS
SOILS
SULFATES
SYNCHROTRONS
X-RAY DIFFRACTION