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Three Gorges Dam Essay

1066 words - 5 pages

Name:Three Gorges Dam

Location:Located on Yangtze river in Sandouping,South China.

Co-ordinates:30 49’ North 111 00’ South.

Dam Type:Concrete Gravity Dam.

Length of the dam:2.3 Km.

Height of the dam:185 m

Materials used are:Cement(10.82 million tons),Concrete(26.4 million cu.m),Rolled Steel
(1.92 million tons),Timber(1.6 million cu.m).

Construction Period:1993-2009

Construction Cost:25 billion US Dollars.

Expected Life:100 years.

Climatic Data:

Average Max Temperature:32 deg.

Average Min Temperature:2 deg.

Some Statistics about the dam:

Reservoir Capacity:1.39 trillion cu.ft.

Electricity ...view middle of the document...

Because of increase in environmental demands structure must be pleasing in appearance.And last but not the least construction process and procedures must reflect an economical design and use of materials,manpower and construction effort.

Concrete Properties:

A gravity dam must be constructed of concrete which will meet the design criteria of strength,durability and permeability and other factors.Mix proportions are usually controlled by strength and durability considerations,cement content should be optimized to reduced the effects of heat of hydration.Properties of concrete vary with the mix proportions,type of ingredients and with age also.Tests must be made on full mass mix and specimens must be off sufficient age to adequately evaluate the strength
and elastic properties which will exist for concrete in the dam.According to Indian Code
of Standards mostly mass concrete may have largest size aggregate from 10 cm
(preferably 15 cm ) to 23 cm and cement content ranging from 150 to 235 kg per cu.m.
For heavily reinforced concrete largest size of aggregate as 2 cm and cement content of
approximately 355 kg per cu.m.

Strength of concrete:

The strength of concrete should satisfy early load and construction requirements and at some specific age it should have some specific compressive strength as determined by the designer.The specific age is often 365 days and may vary from structure to another.

Elastic Properties of concrete:

Concrete is not truly a elastic material.When concrete is subjected to sustained loads as may be expected in a dam the deformation produced by the load is divided into two parts elastic deformation which occurs immediately due to instantaneous modulus of
elasticity and the inelastic deformation or creep which develops gradually and continues for a indefinite time.

Thermal Properties:

The effect of change in temperature of a gravity dam depends on the thermal properties of concrete.Thermal properties necessary for the evaluation of temperature effects are
co-efficient of thermal expansion,thermal conductivity and specific heat.Diffusivity of
concrete is the index of facility with which concrete will undergo temperature change.

Other Properties:

These properties must be defined for the evaluation of deformations and strength in concrete structures are poisson’s ratio,unit weight of concrete and drying...

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