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

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

CONSOLUTION

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Principal operational effects

on concrete

Mechanical Physicochemical

Mechanical

•cyclic effect of ice load

•ice–concrete contact pressure

•mechanical wear from water

Physicochemical

•thermal effect

•temperature variations and moisture effect

•surface erosion

•damages from chlorides action

Important

•Also drift velocity and concrete surface roughness affect abrasion degree.

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.