rmc plant and its components, testing and design mix
TRANSCRIPT
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SUMMER TRAINING AT Ultratech RMC
SUBMITTED BY:Abhimanyu Saraswat
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Truck washing
entry
Weighing area
quality store ticket
Yamuna sand/red
sand
20 mm
10 mm
hoppermixer
T.M repair
silo
silo
silo
pump
truck
LAYOUT OF THE PLANT
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MAIN THINGS DONE IN SUMMARY TRAINING
TESTING
1) SLUMP TEST2) SLIT TEST3) BULK DENSITY
WORKING OF A RMC PLANT
DESIGN MIX OF CONCRETE
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EQUPIMENTS OF MOST IMPORTANT TESTS
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TOTAL TEST DONE
Sieve analysis Air entrainment meter Consistency (normal, initial and final)- not done Fly ash content Specfic gravity of fine & coarse aggregates Aggregate impact test Speedy moisture test Flakiness and elongation
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WORKING PROCEDURE
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FLOW CHART IN RMC
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PROCESS IN PICTURES
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STORAGE OF 10 MM AND 20 MM
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PUTTING AGGREGATES/SAND IN HOPPER
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BY CONVEYOUR BELT TO SKIP
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SKIP TO MIXER
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MIXER
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CONTROL PANEL
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READY TO MOVE
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POURING OF CONCRTE IN PUMP AT SITE
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DESIGN MIX BY IS 10262 AND 456
Step 1: f m=f ck+ 1.65σ.
Step 2 : selection of w/c from curves .
Step 3: Estimate water content & sand contents for concrete grades up to M35 up M35/ above M35
w/c curve Steps of design
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STEP 3 ADJUSTMENT IN WATER AND SAND CONTENT
Condition Adjustment
Sand zone 1,3 and 4 (for 2 no change)
No change in water content but sand -1.5% for zone 3,1.5 % for zone 1 -3% for zone 4
Increase / decrease of Compaction factor by 0.1
Water content increased by +_ 3%No change in sand
w/c ratio increased or decreased by 0.05
No change in water content but +_ 1% in sand content
For round aggregates -15kg/m3 for water and -7% for sand
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CONTD ….
Step 4: Calculate cement content, Aggregate contents,
10001*)*
)1(1(
ScCa
pScCWV
10001*)*1(
SfFa
pScCWV
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LAB CONCRETE MIXER
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PROBLEMS EXPERIENCED Some sites are just too far away. Generation of road traffic. Concrete's limited time span between mixing and
going-off means that ready-mix should be placed within 10 minutes of batching at the plant.
Slump loss is also a major issue in RMC which result
in a loss to company as the buyer tends to reject the product.
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