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EFFECTS OF AGGREGATE PROPERTIES ON CONCRETE

Concrete is a mixture of cementitious material, aggregate and water. Aggregate is commonly considered inert filler, which accounts for 60 to 80% of the volume and 70 to 85% of the weight of the concrete. Although aggregate is considered inert ...

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SELECTION OF DURABLE CONSTRUCTION MATERIALS

Achieving  durability for concrete structures: The  durable  concrete structures  are  to  be  conceptualized, specified,  designed,  contracted,  constructed  and  maintained.  To  achieve  the design  life  of  the  structure  at  reasonable  maintenance  cost,  the  following aspects are required to be taken care of: ...

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BEHAVIOUR OF CONCRETE IN EXTREME FIRE

Behaviour of concrete in extreme fires Concrete does not ‘melt’ in the majority of extreme fire conditions but it could do so in conditions such as created by, for example, a thermic lance (steel burning in a pure oxygen environment). However, ...

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EFFECT OF AIR ENTRAINED CONCRETE ON CONCRETE STRENGTH

Air entrained concrete has effects on compressive strength of concrete and its workability. Air entrained concrete increases the workability of concrete without much increase in water-cement ratio. Compressive strength of concrete is inversely proportional to workability of concrete. When ...

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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 ...

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FACTORS AFFECTING STRENGTH OF CONCRETE

FACTORS AFFECTING CONCRETE STRENGTH Concrete strength is effected by many factors, such as quality of raw materials, water/cement ratio, coarse/fine aggregate ratio, age of concrete, compaction of concrete, temperature, relative humidity and curing of concrete. 1. Quality of Raw Materials: Cement: Provided the ...

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DESIGNED CONCRETE SPECIFICATIONS

Designed concrete are those for which the producer is responsible for selecting the mix proportions to meet the required performance as communicated by the specifier. Therefore it is essential that the specifier, in compiling the specification, takes account of:The uses ...

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PROPERTIES OF HARDENED CONCRETE

Fully cured, hardened concrete must be strong enough to withstand the structural and service loads which will be applied to it and must be durable enough to withstand the environmental exposure for which it is intended. When concrete is made ...

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PROPERTIES OF FRESH CONCRETE

Workability of Concrete: Concrete workability is the relative ease with which a fresh mix can be handled, placed, compacted, and finished without segregation or separation of the individual ingredients. Good workability is required to produce concrete that is both economical and ...

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CONCRETE CREEP

CONCRETE CREEP Creep is defined as the long term deformation under a sustained load. Water within the hardened cement paste is forced to more as a result of the applied load. This movement of moisture is the primary cause of creep ...

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