Stability of Portland cement-based binders reinforced with natural wollastonite micro-fibers

Journal Article · Fri Dec 31 23:00:00 EST 1993 · Cement and Concrete Research; (United States)

DOI:https://doi.org/10.1016/0008-8846(94)90007-8· OSTI ID:7166690

Low, N M.P. ^[1]; Beaudoin, J J ^[2]

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1. Univ. of Ottawa, Ontario (Canada). Dept. of Civil Engineering
2. National Research Council of Canada, Ottawa, Ontario (Canada). Inst. for Research In Construction

The stability of Portland cement-based binders reinforced with natural wollastonite micro-fibers was investigated for hydration periods up to one year. The wollastonite micro-fibers imbedded in the hydrated cement paste were examined employing a scanning electron microscopy technique. Composite specimens were also periodically evaluated by flexural strength testing and microstructural characterization including mercury intrusion porosimetry, helium gas pycnometry, and isopropyl alcohol saturation measurement. The amount of Ca(OH)[sub 2] in the hydrated matrices was also determined by differential scanning calorimetry. Wollastonite micro-fibers imbedded in hydrated cement-silica fume matrices remained stable after prolonged hydration and exhibited no surface or bulk deterioration. The flexural strength and overall pore structure of the Portland cement-based binders reinforced with wollastonite micro-fibers also remained essentially unchanged and unaffected. Flexural toughness and the post peak deflection, however, were observed to decrease with hydration time. The amount of Ca(OH)[sub 2] in the hydrated matrices decreased slightly at advanced hydration times. The observed behavior is discussed.

• OSTI ID: 7166690
• Journal Information: Cement and Concrete Research; (United States), Journal Name: Cement and Concrete Research; (United States) Vol. 24:5; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
360603* -- Materials-- Properties
ALKALINE EARTH METAL COMPOUNDS
BINDERS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CEMENTS
FIBERS
FLEXURAL STRENGTH
HYDROGEN COMPOUNDS
HYDROXIDES
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXYGEN COMPOUNDS
PORE STRUCTURE
PORTLAND CEMENT
REINFORCED MATERIALS