Admixture is an extra substance added to improve properties of concrete

1. ADMIXTURES
PRESENTED BY,
•AISWARYA. A. KUMAR
•AMINA. RASAK
•AMRITA. P. VIJAY
•ANAGHA .VINOD
•ANUPAMA. GANESH
•ARDRA. S .ANIL
•ARDRA .SUSHEELAN
•ANCHU. C. BABU
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2. CONTENTS
RETARDER WORKABILITY
AGENTS
WATER
PROOFING
ADMIXTURE
MICELLANEOUS
ADMIXTURE
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3. 1.RETARDERS
WHAT IS RETARDER?
• Retarder is an admixture that slowsdown
chemical process of hydration
USES OF RETARDERS
• Overcome accelerating effect of temperature in
hot weather concreting
• Grouting oil wells[ if depth>6 km]
• To obtain exposed aggregate look in concrete
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4. AMAZING EXPOSED
AGGREGATE ARCHITECTURE
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5. COMMON RETARDERS
CALCIUM SULPHATE
GYPSUM[ used only when
inspection and control available]
STARCH,COMMON
SUGAR,ACIDS & SALTS
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6. RETARDING PLASTICIZERS
1. All plasticizers and the superplasticizers by
themselves shows certain extent of
retardation.
2. Retarders are mixed with plasticizers or
superplasticizers at the time of commercial
production.
3. Such commercial brand is known as
“RETARDING PLASTICIZERS OR RETARDING
SUPERPLASTICIZERS”.
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7. RETARDING PLASTICIZERS
4. Example for Retarding plasticizer is
ASTM type D and example for retarding
superplasticizer is ASTM type G.
USES
1.Long transportation
2.During high temperature
3.Avoid construction of cold joints
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8. ASTM Categories of admixtures
1. Type A
2. Type B
3. Type C
4. Type D
5. Type E
6. Type F
7. Type G
a) Water reducing admixture
b) Retarding admixture
c) Accelerating admixtures
d) Water reducing and retarding
e) Water reducing and accelerating
f) High range water reducing
g) Water reducing,high range,retarding
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ASTM C494 specifies the requirement for
seven chemical admixture types they are:

9. 2.WORKABILITY AGENTS
WORKABILITY IS IMPORTANT UNDER;
Concrete to be placed in deep
beams,thin sections,closely spaced
reinforcement
Where special means of
placement required[chute,tremie]
If concrete is harsh /For making
high strengh concrete
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10. MATERIALS USED AS
WORKABILITY AGENTS
Finely divided
materials
Plasticizers/su
per plastizers
Air entraining
agents
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11. SHALL WE STUDY PROPERTIES OF
FINELY DIVIDED MATERIALS???
• In appropiate quantity
• Reduce rate and amount of bleeding
• Increases strength of lean concrete
• Maynot increase water requirement
& drying shrinkage
• Increases workability
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12. EFFECTS IF WORKABILITY IS
REDUCED…A PEEP
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OUTPUT OF WORKABLE CONCRETE

13. 3.WATER PROOFING
/DAMPPROOFING ADMIXTURE
What
is it?
• WPA is seen in powder,paste/liquid form
• Consist of porefilling/ water repellent
materials
Types
• Chemically active porefills
• Chemically inactive porefills
Contains
• Silicate of soda,aluminium &zinc sulphates
• Chalk,fuller earth,talc
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14. SEE WHAT WILL HAPPEN IF
DMA NOT USED…
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15. HERE ARE THEY…..
Accoproof:
• It is a white powder
• Mixed at rate 1kg/ 1 bag of cement
• It increases impermeability of concrete
structures
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16. Natson’s Cement Water proofer
•As name indicates it is a water proofing Admixture
•Mixed at rate of 1.5 kg /bag of cement
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17. con
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TRIP –L-SEAL
•It is a white powder
•Addition decreases permeability
•Produces rapid hardening effect

18. CICO
• Colourless liquid
• Control setting time,increase strength,water
proofing
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19. CEMENT:
•It is a water proofing admixture
•Recommended dose is 3% by weight of cement
•Prevents effloresence and growth of fungi
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20. Feb –mix-admix:
•Light yellow coloured liquid
•Claimed to impart water proofing quality to concrete
•Increase workability and bond
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21. FACING DIFFICULTY IN
BYHEARTING THE NAMES
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“HERE THE SOLUTION”
MNEMONICS

22. COMMERCIAL WATER PROOFING
ADMIXTURES
• Arzok
• Wet seal
• Impermo
• Luna –Ns-1
• Omson’s “watse”
• Water lock
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23. WHAT REALLY IS A MISCELLANEOUS
ADMIXTURE? HAVE A LOOK….
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• Specialised admixtures which are not considered
as chemical ,airentraining or mineral admixture
• Provides unique properties such pumping
concrete, dampproofing,reduce
shrinkage,colouring & avoid attack of fungi
COMPRISES OF
ORGANICS INORGANIC SYNTHETICS

24. AREAS WHERE MISCELLANEOUS
ADMIXTURE IS APPLICABLE
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25. MISCELLANEOUS
ADMIXTURES
INTRODUCTION
• Hundreds of commercial admixtures
• They effect more than one property
• They are sometimes ineffective & donot fill
claims of manufacturers
• It is not intended to deal in detail about them
ROUGH CLASSIFICATION
• Damp proofers[accoproof,cemet,trip-l-seal]
• Surface hardeners[metal crete,ferrocrete
no1,metal crete steel patch, “ lispol N”]
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26. TYPES OF SURFACE HARDENERS
METALCRETE:
 Metallic aggregate specially processed,size graded
iron particles
 Gives wear resistence,corrosion resistence,non
dusting,slipping concrete surface
FERROCRETE NO 1:
 Surface hardener that makes concrete surface
compact,dense ,homogenous
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27. METAL CRETE STEEL PATCH:
• When added 20% by weight of cement
increases compressive strength and abrasion
resistance
ARCONATE NO 1:
• It is black powder
• Composed of iron fillings
• Surface hardener in concrete
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28. MAGIC OF SURFACE HARDENERS
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29. LISPOL -N
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30. LET US REVISE…
No Admixture Uses Examples
1. Retarders Lengthen
setting time
CaSO4,gypsm,starch,c
ommon sugar,acids
,their salts
2. Workability agents Improves
workability
Finely divided
materials,Superplastici
zers,Air entraining
agents
3. Dampproofing
agents
Retards
moisture
penetration in
dry concrete
Accoproos,trip-l-
Seal,cement,Feb-Mix-
Admix
4. Miscellaneous
admixture
Reduces
shrinkage,fungi
,corrosion
Metalcrete,Accoproos,
Ferrocrete,Cico, “lispol
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31. PREVIOUS UNIVERSITY QUESTIONS
• SHALL WE PREPARE….
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WHICH ONE YOU
WANT???

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33. REFERENCES
• Note- shivkumar sir
• Concrete technology -M S Shetty
• Structural engg materials -N.Jackson,
Ravindra .K.Dhir
• Figures –google
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