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Aug 11 2018018332When the aggregate is sieved through 475mm sieve the aggregate retained is called coarse aggregate Gravel cobble and boulders come under this category The maximum size aggregate used may be dependent upon some conditions In general 40mm size aggregate used for normal strengths and 20mm size is used for high strength concrete
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Aggregate in precast concrete is a structural filler but its role is more important than what that simple statement implies Aggregate occupies most of the volume of the concrete It is the stuff that the cement paste coats and binds together The composition shape and size of the aggregate all have significant impact on the workability
The fine aggregate is natural sand that has been washed and sieved to remove particles larger than 5 mm and the coarse aggregate is a gravel that has been crushed washed and sieved so that the particles vary from 5 to 50 mm in sizeThe fine and coarse aggregate is delivered separately As they need to be sieved a prepared mixture of fine and coarse aggregate is more expensive than the
Mar 02 2018018332When the size of aggregate is greater than 475 mm say 5 mm it is called coarse aggregate Graded aggregates are used for better particle packing The larger the size of aggregate lesser the cement required for same strength up to certain grade
Crushed aggregate is produced by crushing quarry rock boulders cobbles or largesize gravel Recycled concrete is a viable source of aggregate and has been satisfactorily used in granular subbases soilcement and in new concrete
Contractors placing decorative exposedaggregate concrete where appearance is a prime concern should pay special attention to the aggregate shape texture color and overall appearance to yield the best looking final product Photo 8 When placing architectural concrete you should test trial mixes and place mockups to ensure that all
The nominal maximum size of an aggregate is the smallest sieve opening through which the entire amount of aggregate is permitted to pass Hence a 4 x 8 in 100 x 200 mm can be specified if no aggregate used for making the concrete cylinder is retained on a 1188 in 315 mm sieve
Mar 16 2017018332Concrete contains aggregate upto a maximum size of 150 mm Grading of Aggregates Way particles of aggregate fit together in the mix as influenced by
According to size the aggregates are classified as Fine Aggregate Coarse Aggregate All in Aggregate Fine Aggregate It is the aggregate most of which passes 475 mm More what is density of 20 mm aggregate Rock Crusher
Generally the size of coarse aggregate used is 10125 mm If we use the proportional mix of different sizes small to large gt45 mm to 2025 mm this make the concrete structure compact by align