PERMEABILITY TEST FOR CONCRETE COVER

The durability of concrete structures depends on the permeability of reinforcement cover by concrete. It is this thin layer of concrete over reinforcement on which life of a structure depends. The permeability tester for concrete cover is a non-destructive instrument ...

CONSTRUCTION DEFECTS IN CONCRETE STRUCTURES

Defects in concrete structures can be due to poor construction practices i.e. poor construction quality control at site or due to poor structural design and detailing. But, after construction at site, the common types of defects in concrete structures are ...

CAUSES OF CONCRETE FAILURE

Causes of Concrete Failure Corrosion is not the only source of failure. Many other sources cause deterioration on reinforced concrete structures; this must be kept in mind and understood well when an inspection is undertaken. These sources of failure include: • Unsuitable ...

EXPOSURE CONDITIONS AFFECTING DURABILITY OF CONCRETE

There are five levels of environment exposure of concrete for which durability requirements of concrete depends. These are:Mild exposure Moderate exposure Severe exposure Very severe exposure, and Extreme exposure.These are the environments to which the concrete will be exposed during its working life. The ...

CHLORIDE ATTACK ON CONCRETE STRUCTURES

Chloride Attack on Concrete Structures: Chloride attack is one of the most important aspects for consideration when we deal with the durability of concrete. Chloride attack is particularly important because it primarily causes corrosion of reinforcement. Statistics have indicated that over ...

CARBONATION OF CONCRETE STRUCTURES

Carbonation of concrete Structures The microstructure of concrete is such that it has capillary pores to the extent of 28%. The extent of pores depends upon quality of concrete and the presence of water at the time of mixing of concrete. ...

TEMPERATURE EFFECTS ON CONCRETE

THERMAL MOVEMENT IN CONCRETE As with any material, concrete will expand and contract as the temperature rises and falls. The size of movement depends upon the change in temperature and the coefficient of thermal expansion o f concrete. The coefficient of thermal ...

COLD JOINT IN CONCRETE

What is Cold Joint in Concrete? An advancing face of a concrete pour, which could not be covered by fresh concrete before expiry of initial setting time (due to an unscheduled stoppage or delay on account of breakdown in plant, inclement ...

FACTORS AFFECTING DURABILITY OF CONCRETE

DURABILITY OF CONCRETEConcrete durability has been defined by the American Concrete Institute as its resistance to weathering action, chemical attack, abrasion and other degradation processes.Durability is the ability to ...