Files > Download Recycled Concrete Aggregate PowerPoint Presentation CivilEngineeringBible com FREE One of the major challenges of our present society is the protection of environment Some of the important elements in this respect are the reduction of the consumption of energy and natural raw materials and consumption of waste materials
Get PriceAggregate is the granular material such as sand gravel crushed stone crushed blastfurnace slag or construction and demolition waste that is used withementing medium to produce either concrete or mortar aggregate should be inert and strong and it forms the skeleton of matrix 6075 by volume 2540 paste amp12 voids all aggregates must be
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Get PriceAggregates PPT Aa Construction Aggregate Structural 2024 3 5 At least three quarters of the volume of concrete is occupied by aggregates Cheaper use of coarser aggregates lowers cost of concrete mix by reducing cement requirements Aggregate is important because it influences the performance of concrete get price
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Get PriceTYPES OF AGGREGATES 1 COARSE AGGREGATES • Gravel and crushedstone • Rough and coarse intexture • Particles 5 mm • typically between9 5 and 37 5 mm Types of aggregates 2 FINE AGGREGATES • Sand and/or crushedstone • Thinner and smaller insize • Particles < 5 mm • Content usually 35%to 45% by mass orvolume of totalaggregateTypes of aggregates
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Get PricefRecycled Aggregates RA Recycled aggregates are the aggregates produced from the processing of previously used construction materials such as concrete or masonry Recycled aggregates consists of hard graduated fragments of inert materials including sand gravel crushed stone slag rock dust etc 4 fNeed for the use of RA in concrete
Get Price• Aggregates are the important constituents in concrete They give body to the concrete reduce shrinkage and effect economy • The primary constituents of slag are lime CaO and silica SiO2 Portland cement also contains these constituents The primary constituent of slag is soluble in water
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Get Pricemodulus of elasticity test28 day test of the hardened concrete 1 the cylinders were capped with the patented capping compound 2 the cylinder was loaded to 1/3 of the cube strength 3 the load wassustained for 1 minute and then released 4 the same load was loaded again in10 approximately equal increments 5 the strains of the concrete were …
Get Priceaggregate gradation also known as sieve analysis it is the distribution of particle sizes well graded aggregates particles evenly distributed among sieve sizes require less cement and water than poorly graded aggregates careful choice of aggregates provides for optimization of cement water and admixtures most common sieve series sieve …
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Get PriceThe utilization of recycled aggregate is particularly very essential as major part of concrete is made of aggregates Most of waste materials produced by demolished structures disposed off by dumping them as land fill Dumping of wastes on land is causing shortage of dumping place in urban areas Therefore it is necessary to start recycling
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Get PriceAggregate Concrete Technology Mar 19 2024 • 180 likes • 12 940 views Engineering Lesson Concrete Technology Building Materials The quality of aggregate affect the durability and strength of concrete Since about 3/4 of the volume of concrete is occupied by aggregate David Grubba Follow Advertisement Recommended Aggregates Huzaifa Shafiq
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Get PriceTitle AGGREGATE 1 AGGREGATE Aggregates may be NATURAL or MANUFACTURED Natural aggregates sand gravel crushed rock Manufactured aggregates blast furnage slag Aggregates may also be COARSE or FINE or FILLER Coarse aggregates gt 4 76mm Fine aggregates 0 075mm 4 76mm Filler lt 0 075mm 2 COARSE AGGREGATEproperties Strength kekuatan and toughness
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Get PriceNormal Weight Aggregate ASTM C 33 Most common aggregates Sand Gravel Crushed stone Produce normal weight concrete 2200 to 2400 kg/m3 12 Lightweight Aggregate 1 ASTM C 330 Expanded Shale Clay Slate Slag Produce structural lightweight concrete 1350 to 1850 kg/m3 13 Lightweight Aggregate 2 ASTM C 330 Pumice Scoria Perlite Vermiculite Diatomite
Get PriceThe aggregates used in the production of concrete are inert granular materials such as gravel crushed stone sand slag and recycled concrete The aggregates might be natural manufactured or recycled Usually the aggregates are obtained by crushing the naturally occurring rocks
Get PriceStructural grade low density aggregate • Produced generally by heating particles of shale clay or slate to about 1200ºC in a rotary kiln At this temperature the raw material bloats forming a vesicular structure that is retained upon cooling In this process the particle density changes from about 2 65 to less than 1 55 after cooling
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Get PriceThe raw materials used for this study are natural coarse NG and fine NS calcareous aggregates coarse RG and fine RS crushed bricks aggregates and a Portland cement type CEM I 32 5 from Meftah local factory with a Blaine fineness of 3160 cm 2 /g The grain size distribution of natural and recycled aggregates used is presented in Fig 1 and their physical and mechanical properties are
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Get PriceMaterials cementitiousmaterials used studywere ordinary Portland cement PC equivalent ASTMType SFsourced commercially MKobtained from Imerys Minerals chemicalcompositions cement MK coarseaggregate used crushedgranite nominalsizes 20mm specificgravity 2 62g/cm concretemixtures 20 mmcoarse aggregates were used 1 2 Natural river sand
Get PriceAs a result of freeze thaw cycles there was a decrease of as much as 1% aggregates for concretes ppt Know More Aggregates cement 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
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