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WEL-COME
THE MS UNIVERSITY OF BARODA
POLYTECHNIC
Second sem., S.y.d.civil
Roll no: 34 to 44
CIVIL ENGINEERING DEPARTMENT
TOPICS:
1. WHAT IS CONCRETE
2. INGRADIENTS OF CONCRETE
3. VARIOUS TYPES OF CONCRETE
4. PROPOSTIONING OF CONCRETE
5. BATCH...
It is simply defined as the mixture of
cement , fine aggregates , coarse aggregates , water
, admixtures
 Concrete used o...
INGREDIENT
cement
If fills up voids existing in fine aggregates.
It provides strength and binding properties to the
concre...
INGREDIENT
Water
Water acts as a lubricant for the aggregates and
gives workability to the concrete.
The quality of concre...
Admixtures
1. Chemical admixture
 (for specific property i.e. performance &
enhancement)
2. mineral admixture
 (for impr...
Types of concrete
According to design of
concrete:
 P.C.C. (Plain cement concrete)
 R.C.C. (Reinforcement cement concre...
According to grade it is
defined as:
 The grade of concrete is specified by its 28 Day’s
cube strength ( e.g. M20 means t...
PROPORTIONING OF
CONCRETE
Methods
 By designing the concrete mix.
 By adopting nominal mix.
 Arbitrary method.
 Finene...
• Batching is the process of measurement of
specified quantity of ingredient in correct
proportion batching is done by two...
Batching
 The equipment falls into three
categories in both batching process
as follow:
1. Manual batching
2. Semi-automa...
Volume batching
Batching by volume means the measurement of ingredients is
done by volume.
 Generally cement is measured ...
weigh batching
 Batching is done by the weight of ingredient. It is
more preferable than volume batching. It is more
accu...
For the process of hydration dry mix of ingredients , the water is
added.
The water make the concrete mix workable.
Acco...
Water cement ratio
Concrete ratio quantity Water
1:3:6 34 litre
1:2:4 30 litre
1:1.5:3 27 litre
1:1:2 25 litre
For differe...
Mixing of the concrete
 For producing the homogeneous mass of concrete , the
ingredient are mixed . Depending upon the
re...
Hand mixing
 In this type , the mixing is done by manual labors.
 This method is adopted for small construction
works .
...
Hand mixing procedure
 Construction of platform of bricks , lean concrete
or iron-sheet.
 Spread-out sand evenly , sprea...
Hand mixing
Machine mixing
 This is similar to hand mixing only the mixing is
carried out in a rotating drum
Machine mixing
For machine mixing , all the ingredients of concrete
including water are collected in a revolving drum
and ...
Machine mixing
Machine mixing
 Types of machine mixing
1. Manual mixer
2. Electrical mixer
3. Fuel mixer
R M C
( Ready Mix Concrete )
 Ready – mix concrete is type of concrete that is
manufactured in a factory or batching plan...
RMC
( Ready Mix Concrete )
 It is manufactured
under computer-
controlled operations
and transported and
placed at the si...
RMC
( Ready Mix Concrete )
Advantages of ready mix
concrete
 Better quality concrete is produced.
 storage space for basic materials at site is not...
Workability
 It is desirable that freshly mixed concrete be
relatively easy to transport , place , compact and
finish wit...
Slump Test
 This test is performed for getting rough idea of workability.
 Procedure:
 Place frustum on the base plate....
Slump test
Slump test
 Results:
 There are three types of slump that can happen
which are:
 True slump
 Shear slump
 Collapsed s...
Slump test
Group members
Jadav Keyur
Jangid Rinku
Joshi Parth
Kachipulav Ishtiyaq
Kachot Nilesh
Kadam Karan
Kadu Mayur
Katariya Kiran...
We are thankful to….
 All respected lecturers and all supported
members for preparation of this presentation…
Special tha...
Thank you
To all of you……
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Mixing of concrete.pptx

mixing of concrete, msu-polytechnic-2014-15

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Mixing of concrete.pptx

  1. 1. WEL-COME
  2. 2. THE MS UNIVERSITY OF BARODA POLYTECHNIC Second sem., S.y.d.civil Roll no: 34 to 44 CIVIL ENGINEERING DEPARTMENT
  3. 3. TOPICS: 1. WHAT IS CONCRETE 2. INGRADIENTS OF CONCRETE 3. VARIOUS TYPES OF CONCRETE 4. PROPOSTIONING OF CONCRETE 5. BATCHING OF CONCRETE 6. WATER CEMENT RATIO 7. MIXING OF CONCRETE 8. SLUMP TEST 9. WORKABILITY MIXING OF CONCRETE
  4. 4. It is simply defined as the mixture of cement , fine aggregates , coarse aggregates , water , admixtures  Concrete used on worked is specified according to IS 456(2000) .  It is one of the very important and widely used material in construction .  concrete = binder + fillers Cement , water, admixture Fine aggregates and coarse aggregates (which occupies around 60%) CONCRETE
  5. 5. INGREDIENT cement If fills up voids existing in fine aggregates. It provides strength and binding properties to the concrete mixture. Fine aggregate The particles which passes from IS sieve 4.75 mm & should be retained from 75 micron is known as fine aggregates. It should not contain any organic material. The main function of fine aggregate is to fill-up voids existing in coarse aggregates. Coarse aggregate The particles which are retained through IS sieve 4.75 is known as coarse aggregates. Coarse aggregates should be hard & strong to give enough strength and durability to concrete.
  6. 6. INGREDIENT Water Water acts as a lubricant for the aggregates and gives workability to the concrete. The quality of concrete depends on the quality and quantity of the water added. Admixture Admixtures or additives as required by situation, ingredients added to concrete or mortar modifies its properties immediately before or after mixing.
  7. 7. Admixtures 1. Chemical admixture  (for specific property i.e. performance & enhancement) 2. mineral admixture  (for improvement of long – term strength & durability) others :  Air entraining admixtures.  High range of water reduces or super plasticizers.  Normal range of water reducers or plasticizers & retarders.
  8. 8. Types of concrete According to design of concrete:  P.C.C. (Plain cement concrete)  R.C.C. (Reinforcement cement concrete)  B.B.C.C. (Brick bats cement concrete)  B.B.L.C (Brick bats lime concrete)
  9. 9. According to grade it is defined as:  The grade of concrete is specified by its 28 Day’s cube strength ( e.g. M20 means the cube strength is 20 N/sq. mm) M7.5 1:4:8 M10 1:3:6 M15 1:4:8 M20 1:1.5:3 M25 1:1:2
  10. 10. PROPORTIONING OF CONCRETE Methods  By designing the concrete mix.  By adopting nominal mix.  Arbitrary method.  Fineness modulus of method.  Maximum density method.  Maximum voids method.  w/c ratio method (water cement ratio).
  11. 11. • Batching is the process of measurement of specified quantity of ingredient in correct proportion batching is done by two process. 1. By volume batching : • Batching by volume means measuring ingredient of concrete by its volume. 2 . By weigh batching : • Batching is done according to the weight of ingredients. It is more preferable method to volume batching. BATCHING OF CONCRETE
  12. 12. Batching  The equipment falls into three categories in both batching process as follow: 1. Manual batching 2. Semi-automatic batching 3. Fully-automatic batching
  13. 13. Volume batching Batching by volume means the measurement of ingredients is done by volume.  Generally cement is measured by weight or number of bags.  Batching of aggregate should be done with the Forma or Cage Box  Batching of water is done with the help of calibrated canes & the measuring accuracy should be within 1%.  Batching of admixture should be done as same accuracy for cement (mineral admixture) and water (chemical admixture).  For e.g. proportion (1:2:4)  i.e. 1 part of cement  2 part of sand  3 part of coarse aggregates
  14. 14. weigh batching  Batching is done by the weight of ingredient. It is more preferable than volume batching. It is more accurate & needs more uniform proportioning.
  15. 15. For the process of hydration dry mix of ingredients , the water is added. The water make the concrete mix workable. According to Abram’s w/c law , lesser the w/c ratio in a workable mix , greater will be the strength. The lower water content will produce stiff paste having greater binding strength will be increase. Higher water will increase the workability but decrease the strength of the concrete mix. Generally a minimum w/c ratio is taken 0.3 by weight. Typical values are 0.4 to 0.6 . w/c ratio= water cement Water-cement ratio
  16. 16. Water cement ratio Concrete ratio quantity Water 1:3:6 34 litre 1:2:4 30 litre 1:1.5:3 27 litre 1:1:2 25 litre For different ratio of concrete the amount of water for 50 kg of cement is as below:
  17. 17. Mixing of the concrete  For producing the homogeneous mass of concrete , the ingredient are mixed . Depending upon the requirement , quality , quantity , etc, the method of mixing is decided.  Generally there are two methods for mixing the concrete , o 1. hand mixing :  by manual labors  Small works o 2 . Machine mixing : • For big works where requirement is continuous • Mixed automatically in batching plants
  18. 18. Hand mixing  In this type , the mixing is done by manual labors.  This method is adopted for small construction works .  Requirement of cement is more than machine mixing (10%).  Normally the mixing time is about 3 minutes.
  19. 19. Hand mixing procedure  Construction of platform of bricks , lean concrete or iron-sheet.  Spread-out sand evenly , spread cement on it.  Mix it till the color of mixing become uniform.  Spread this mixture & spread coarse admixture then mix it.  During mix it remaining water should be added with continuation process.  Time for mix is generally 2 to 3 minutes.
  20. 20. Hand mixing
  21. 21. Machine mixing  This is similar to hand mixing only the mixing is carried out in a rotating drum
  22. 22. Machine mixing For machine mixing , all the ingredients of concrete including water are collected in a revolving drum and then the drum is rotated for a certain period.
  23. 23. Machine mixing
  24. 24. Machine mixing  Types of machine mixing 1. Manual mixer 2. Electrical mixer 3. Fuel mixer
  25. 25. R M C ( Ready Mix Concrete )  Ready – mix concrete is type of concrete that is manufactured in a factory or batching plant , according to design and then delivered to a work site , by transit truck.  RMC is bought and sold by volume.  The truck carries a mix in a revolving chamber which like the concrete mixer . It prevents the segregation of concrete .
  26. 26. RMC ( Ready Mix Concrete )  It is manufactured under computer- controlled operations and transported and placed at the site of constructed.
  27. 27. RMC ( Ready Mix Concrete )
  28. 28. Advantages of ready mix concrete  Better quality concrete is produced.  storage space for basic materials at site is not required .  Wastage of basic materials are avoided.
  29. 29. Workability  It is desirable that freshly mixed concrete be relatively easy to transport , place , compact and finish without harmful segregation.  A concrete mix satisfying these condition is said to be workable.  Use of aggregates which are round and have smooth surface increases the workability.
  30. 30. Slump Test  This test is performed for getting rough idea of workability.  Procedure:  Place frustum on the base plate.  Fill the wet concrete mixture in the cone in three equal layers.  Compact each layer 25 times using compacting steel rod and the top surface is struck off by means of a sawing and rolling motion of the temping rod.  The cone is slowly lifted and observed the slump.  Invert the frustum and place it close to the collapsed concrete.  Measure and record the slump and type of slump.  The slum can be measure as shown in figure.
  31. 31. Slump test
  32. 32. Slump test  Results:  There are three types of slump that can happen which are:  True slump  Shear slump  Collapsed slump as shown in the below figure.
  33. 33. Slump test
  34. 34. Group members Jadav Keyur Jangid Rinku Joshi Parth Kachipulav Ishtiyaq Kachot Nilesh Kadam Karan Kadu Mayur Katariya Kiran Kharva Nehal Kharva Jaina
  35. 35. We are thankful to….  All respected lecturers and all supported members for preparation of this presentation… Special thank to, Lafarge Pvt. Ltd., Harni (Baroda) (RMC batching plant)
  36. 36. Thank you To all of you……

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