rmc plant and its components, testing and design mix
TRANSCRIPT
SUMMER TRAINING AT Ultratech RMC
SUBMITTED BY:Abhimanyu Saraswat
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
MAIN THINGS DONE IN SUMMARY TRAINING
TESTING
1) SLUMP TEST2) SLIT TEST3) BULK DENSITY
WORKING OF A RMC PLANT
DESIGN MIX OF CONCRETE
EQUPIMENTS OF MOST IMPORTANT TESTS
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
WORKING PROCEDURE
FLOW CHART IN RMC
PROCESS IN PICTURES
STORAGE OF 10 MM AND 20 MM
PUTTING AGGREGATES/SAND IN HOPPER
BY CONVEYOUR BELT TO SKIP
SKIP TO MIXER
MIXER
CONTROL PANEL
READY TO MOVE
POURING OF CONCRTE IN PUMP AT SITE
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
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
CONTD ….
Step 4: Calculate cement content, Aggregate contents,
10001*)*
)1(1(
ScCa
pScCWV
10001*)*1(
SfFa
pScCWV
LAB CONCRETE MIXER
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.