ice abrasion and concrete properties · 2017-03-15 · 25 that for selecting of hydraulic concrete...
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ICE ABRASION AND CONCRETE PROPERTIES
2016
Vdovin Aleksei A. Russia, Vladivostok.
master offshore and coastal engineering
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FEFU campus
Russkyi bridge
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CONSTRUCTIONS
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Alexander BekkerDirector of the
school of engineering
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OFFSHORE AND COASTAL ENGINEERING
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ICE ABRASION
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Ice abrasion - important problem
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Abrasive wear of concrete structure
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Concrete requirements on their resistance to ice abrasion
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Janson Researchthe action of drifting ice on the lighthouses
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Itoh Researchdifferent types of concrete laboratory tests
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Huovinen Researchsurvey of lighthouses laboratory tests, tests on the icebreaker, and
computer modeling.
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FEFU investigationsM
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Sample concrete
Ice
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Constructing the worn side surface
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CONSOLUTION
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Principal operational effects
on concrete
Mechanical Physicochemical
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Mechanical
•cyclic effect of ice load
•ice–concrete contact pressure
•mechanical wear from water
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Physicochemical
•thermal effect
•temperature variations and moisture effect
•surface erosion
•damages from chlorides action
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Important
•Also drift velocity and concrete surface roughness affect abrasion degree.
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Three abrasion stages have been singled out
• on the surface area – matrix abrasion
• in the transition zone – matrix abrasion and decaying of bulging out particles of coarse aggregate
• zones of stable abrasion – matrix abrasion and decaying of bulging out particles of coarse aggregate
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The basic properties of concrete are:
•Uniaxial compression strength
•Density
•W/C ratio
• Frost-resistance class
•Modulus of elasticity
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Experiment on abrasion of various concrete mixes is being held now.
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that for selecting of hydraulic concrete mix with high ice abrasion resistance it is necessary to use:
• additive – silica – for strength increase
• more compact structure at the expense of: micro-fillers, air-entraining additives;
• reducing water-cement ratio accordingly to the recommended 0.28-0.35;
• the use of compact aggregate particles to obtain heavy concrete;
• to raise modulus of elasticity;
• to use polyurethane resin for the concrete surface layer protection;
• to modify by aggregate size as from the investigation experience there are contradicting facts concerning the use of coarse or fine aggregate.
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that for selecting of hydraulic concrete mix with high ice abrasion resistance it is necessary to use:
• additive – silica – for strength increase
• more compact structure at the expense of: micro-fillers, air-entraining additives;
• reducing water-cement ratio accordingly to the recommended 0.28-0.35;
• the use of compact aggregate particles to obtain heavy concrete;
• to raise modulus of elasticity;
• to use polyurethane resin for the concrete surface layer protection;
• to modify by aggregate size as from the investigation experience there are contradicting facts concerning the use of coarse or fine aggregate.