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Definition of Concrete Dams

Characteristics of concrete dam
 – Durable and virtually maintenance-free. Requires good geological conditions at the site of the dam.
 – Implementation requires high accuracy.

The properties of concrete
 – Easy to work
 – Concrete durable
 – Meet the press the desired solid
 – small seepage Power
 – small concrete Penyusutsn
 – Coefficient of temperature changes little
 – homogeneous density concrete
 – small concrete volume changes

Building materials of concrete consists of cement (PC), fine and coarse aggregates and water must meet certain requirements:
 – Additional materials (Admixture) consisting of:
 – Materials to speed when tied (setting time).
 – Materials to slow when tied (retarding admixture).
 – Materials to reduce the amount of concrete mix (Plasticisier, Normal water reducing admixture, workability aids).

Materials used to reduce the amount of water used to mix concrete at a time to slow down when tied (retarding water reducing admixture). Materials for menimbukan foam concrete (air entraining agent).
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concrete connection
Beron connection is necessary because of the limitation of the volume each time casting Beron and limited equipment and time.
Type-jens connections:
Tekal connection straight to the dam axis (transverse joint, joint contraction).
 – Connection extends towards the dam (longitudina joint).
 – Connection for implementation (construction joint).
 – Connection lock (key way joint)

Water-retaining material (waterstop)
With the connection to the dam is no risk of seepage through the connection. So the connection must be reinforced with water-retaining material.

Hole (hall) consists of:
 – Lorong cementation: to do good cementation during construction and in the operation phase of repair.
 – Lorong Drainage: to install a pressure relief wells to reduce water pressure upwards.
 – Lorong examination: for inspecting and installing instrumentation dam.
 – The forces acting on the dam

Vertical Style: Heavy weight of the door itself dams including water and other installations. Heavy water in upstream dams form when tilted partially or entirely. Heavy mud upstream dam-sloping when partially or completely.
 – Style press upwards (uplift pressure)

Horizontal force:
 – which is the hydrostatic force of water which suppresses existing dam or no wind.
 – hydrodynamic force which is water that presses the dam if there is an earthquake
 – Style press mud
 – Style quake.

The state of charge (force) that should be taken into account in the planning:
 – The situation at the end of the construction period.
 – kondis empty reservoirs and earthquakes that will push the dam upstream.
 – normal state after the operation.

Cargo style that counts is:
 – Weight alone.
 – The weight of water in upstream dams
 – Style press upward.
 – Style hidrostatiska.
 – exceptional circumstances after the reservoir operation

Cargo style that counts:
 – Weight alone.
 – Heavy water upstream.
 – Heavy mud upstream.
 – Style press upward.
 – hydrostatic force.
 – Style hydrodynamic
 – horizontal force due to pressure mud.
 – horizontal force caused by the earthquake.

Terms stability must be met:
 – No experience overthrow (overturning).
 – Not mengalam shift (slidimg).
 – Voltage ground on the foundation are not exceeded.
 – Water seepage arising manageable.