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Durability of Reinforced

Concrete StructuresAssignment No 2

5/25/2016

Coordinator : assist. R. HOHAN

Student : Craciun Cristina-Alexandra

Gr. 3405 ICE

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Durability of Reinforced Concrete Structures 2016

Degradation survey for Sfanta MariaUrgent Care Clinic for kids

Location: str. Vasile Lupu nr.62, Iasi

Date : 16 May 2016

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Durability of Reinforced Concrete Structures 2016

In the first picture one may see a series of the most

common degradations like cracks,scaling of concrete surfaces

due to freeze-thraw cycles, corroding steel and water

infiltrations.

The expansion of corroding steel creates tensile stresses in

the concrete , which can cause cracking, delamination and

spalling.

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Durability of Reinforced Concrete Structures 2016

On this slab we can see carbonation induced

corrosion.

This phenomenon often occurs on areas of building

facades that are exposed to rainfall, shades fron sunlight

and have low concrete cover over reinforcing steel.

Carbonation is highly dependent on the relative

humidity of the concrete.

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Durability of Reinforced Concrete Structures 2016

Here we have some cracks

on the building faade due

to settlements , poor joint

construction ,weather

conditions and/or self

weight of the elements.

Scaling of the concrete is

also present due to freeze-

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Durability of Reinforced Concrete Structures 2016

This crack patern isassociated to the alkali-

silica reaction or it may be

because some aggregates

absorb water and,upon

freezing, expand to

produce a popout.

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Durability of Reinforced Concrete Structures 2016

Reinforcement exposure due to weather conditions ,

mechanical shock and/or freeze-thraw cycles.

Flat fragments of concrete are detached from the concrete

mass by the rebars corrosion and may fall down.

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Durability of Reinforced Concrete Structures 2016

At the base of the column

we can see vegetation

which means the water is

frequently present

;because of it the concrete

and plaster is also peeled.

In this corner of the

building , at its base we

have water infiltration and

cracks.

Some aggregates react

with the alkali- hydroxides

in concrete causingexpansion and cracks over

a period of years.