C T: Concrete Production Unit 4 Part 1

Que4.1. Explain the  colorful  way in the manufacturing of  concrete. 

Answer  The  colorful stages in the manufacture of concrete are as follows  1. Batching of Concrete Batching is the process of measuring concrete   blend  constituents by either mass or volume and introducing them into the  mixer. To produce concrete of  invariant quality, the  constituents must be  measured directly for each batch. 

The two  styles of batching are as follows  Volume Batching  Volume batching isn’t a good  system because of the inaccuracies it  introduces in the  dimension of  grainy accoutrements . 

Loose beach in a  wettish condition occupies  further volume than dry compacted  beach due to the  miracle of bulking. Hence, the effect of bulking  must be considered while measuring beach. 

Despite  downsides, for less importantnon-engineered small  workshop,  this  system is  espoused because of its ease in  operation. still, it is  unscientific and hence not recommended for important  workshop. 

ii. Weigh Batching  Weigh batching is the correct  system of measuring the accoutrements  that  are used to make concrete.  Use of weigh batching system facilitates  delicacy, inflexibility, and  simplicity.  c. For large  workshop, a weigh batching factory is used. 

2. Mixing The mixing should  insure that the mass becomes homogeneous,  livery in colour and  thickness.  styles of Mixing  Hand mixing.  ii. Machine mixing. 

3. Transporting It’s the process of transferring of concrete from the  mixing factory to the construction  point. It can be done by following  accoutrements   Mortar Pan Concrete is carried in small amounts. 

ii. Barrows and strollers Short flat hauls on all types of onsite  concrete construction. 

iii. Cranes and Pails Used for work above ground  position, pails use  with cranes, cableways, and  copters. 

4. contraction of Concrete  contraction of concrete is process  espoused for expelling the  entangled  air from the concrete. 

ii. In the process of mixing, transporting and placing of concrete air is   probably to get  entangled in the concrete. 

iii. It has been  set up from the experimental studies that 1 air in the  concrete  roughly reduces the strength by 6. 

5. Curing  It’s the process in which the concrete is  defended from loss of  humidity  and kept within a reasonable temperature range. 

ii. The result of this process is increased strength and  dropped  permeability. 

iii. Curing is also a  crucial player in  mollifying cracks in the concrete, which   oppressively impacts  continuity. 

6. Finishing  i. The finish can be  rigorously functional or  ornamental. 

ii. Finishing makes concrete  seductive and serviceable. 

iii. The final texture, hardness, and  common pattern on crossbeams,  bottoms, sidewalks,   quadrangles, and driveways depend on the concrete’s end use. 

Que4.2. Explain the mixing and transporting operations of  concrete in a work  point. 

Answer  styles of Mixing Concrete is mixed either by hand mixing or by  machine mixing, grounded on the  volume of concrete  needed. 

1. Hand Mixing  Mixing by hand is employed only for specific cases where quality isn’t of   important  significance, either because of the  insignificant nature of the  work or because the  volume of concrete  needed is less. 

ii. Hand mixing generally doesn’t produce  invariant concrete and hence  should not be  typically used, unless it’s for  veritably small domestic  workshop. 

2. Mechanical Mixing  Mechanical mixers can be divided into two main types batch mixer and   nonstop mixers. 

ii. Batch mixers produce concrete batch by batch, one batch at a time. The  operation is intermittent. The raw material is loaded at one end and the  concrete is discharged at the other end. This constitutes a cycle of  operation which is repeated until enough  volume of concrete is  produced. 

iii. nonstop mixers produce concrete at a specified rate. The raw accoutrements   are continuously entered at one end and mixed concrete exits from the  delivery end. 

Transportation of Concrete The following  styles are used for  transporting concrete 

  1. Direct Discharge into Forms by Short Cataracts  Short cataracts in asemi-circular shape  strengthened at intervals are simple  and  provident to use. 
  2. ii. Free fall of concrete from a height of  further than 2 m must be avoided. 

2. Barrows  Manual barrows of  roughly 80 kg capacity can be used for  long vertical distances. 

ii. For major  workshop, power barrows of 800 kg capacity, up to 300 m hauls  are used. 

3. Dumpers and exchanges 

i. These are used for vertical long hauls. 

ii. Because of  jarring, especially if the terrain is rough, the concrete during  conveyance has the  threat of  isolation. 

4. Elevating Towers and Hoist Inmulti-storied  structures, elevating   halls are used for lifting concrete pails. The lifted concrete is  also  distributed by either cataracts or barrows. This type of transportation can  be used where high lifts are  needed. 

5. Monorail System

i. In coverts and in  levee  spots, a single track is laid to carry a rail  power cart which moves at a speed of 80 m/min. 

ii. This type of transportation can be used for covering long distances.  6. Cranes and Cableways 

i. When concreting is to be done in a large  design covering mountains and   denes, cranes and cableways are used to  give three- dimensional  transport enabling both vertical and  perpendicular movement. 

ii. Depending on the  point condition, the type of crane can be chosen. It may  be a derrick,  straggler, or wheel mounted. 

7. Belt Conveyor  i. It can be used when hauling concrete over long distances. 

ii. It isn’t  veritably  important recommended because of its vulnerability to   isolation.

 iii. The  original setting- up cost is also high. Discharge can be as high as  115 m3/h.  8. Concrete Pail and Skip The capacity of the skip varies from  about0.2 m3 to 10 m3. 

Que4.3. What are the  preventives to be taken while transporting  concrete? What are the advantages and disadvantages of concrete  pump? 

Answer  preventives in Transporting of Concrete Following  preventives  should be used during transporting of concrete 

1. While water is added to cement, the procedure of hydration  thresholds and  with the passage of time, so concrete should be transported as fast as  possible to the formwork within the  original setting time of cement. 

2. The procedure of mixing, transporting, placing and compacting concrete  should not take  further than 90  twinkles in any case. 

3. No water shall be lost from the  blend during transportation.

4. The concrete combine should be  defended from drying in hot rainfall  and from rain during transport from the place of mixing to the position  of placing. 

5. isolation of concrete should be avoided under all circumstances. 

6. The concrete shall be kept agitated in truck mixer in order to avoid it  from  getting stiff if  further time is likely to be spent during transportation.  Advantages of Concrete Pump 

1. Concrete pumping is a  briskly and  lightly  system to complete a  design. 

2. Concrete pumping reduces labour costs. 

3. It reduces  point traffic as there are less construction workers. 

4. It provides a steady work pace,  adding  productivity. 

5. It’s effective and  provident for  colorful sized  systems, including  domestic and  marketable. 

6. Several pumps can pour  contemporaneously for larger  systems. 

Disadvantages of Concrete Pump 

1. Possibility of a concrete pump breaking down. 

2. threat of injury to construction workers and damage to property. 

3. During busy ages it isn’t always easy to find a concrete pump that is  available.

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