Like the other ingredients of concrete aggregates must also be chosen e structural lightweight concrete 1350 to 1850 kgm3 astm c eight aggregate particle size distribution in an aggregate sample is known as gradation... As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.
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Lightweight aggregate concrete is prepared by using lightweight aggregate or low density aggregate such as volcanic pumice clay slate shale scoria tuff and pellite Concrete is considered to be lightweight is the density is not more than 2200 kgm3 when compared to normal concrete which is 23002400 kgm3 and a proportion of the aggregate should hellip
Compressive strength of concrete increases up to the maximum aggregate size of 15 inch It was also found that compressive strength has no linear relationship with the combine fineness modulus of
Lightweight concrete is used to minimize overall dead load in structures and also has a remarkable fire resistance quality more than normal weight aggregate concrete Lightweight concrete can be
When porous lightweight aggregate is used the adhesion of the aggregate materials to the cement paste depends mainly on the pore size characteristic of the aggregate surface It is believed that the interfacial zone of lightweight concrete should be of lesser dimension than that of normalweight concrete
Aggregates for structural lightweight concrete usually have a top size of minus 34 in or minus 12 in Most lightweight concretes use a lightweight coarse aggregate 34 in to 4 mesh 12 8 with ordinary sand minus 4 mesh minus 48 mm however other combinations of
In normal concrete the aggregate weighs 1520 – 1680 kgm 3 but occasionally designs require either lightweight or heavyweight concrete Lightweight concrete contains aggregate that is natural or synthetic which weighs less than 1100 kgm 3 and heavyweight concrete contains aggregates that are natural or synthetic which weigh more than
Lightweight concrete can be manufactured with a combination of fine and coarse lightweight aggregate or coarse lightweight aggregate and normalweight fine aggregate Complete replacement of normalweight fine aggregate with a lightweight aggregate will decrease the concrete density by approximately 10 lbft 3 160 kgm
The aggregate is used in concrete containing more than 297 kilograms of cement per cubic meter 500 lb of cement per cubic yard when the concrete is not air entrained 3 An approved supplementary cementitious material is used to supply the deficiency in material passing these two sieves Other requirements of ASTM C 33 AASTHO M 6 are 1
Photo 1 Note the wellgraded particle size distribution for this conventional concrete mix Aggregates comprise as much as 60 to 80 of a typical concrete mix so they must be properly selected to be durable blended for optimum efficiency and properly controlled to produce consistent concrete strength workability finishability and durability Photo 1
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