Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing...
-
Upload
duongtuyen -
Category
Documents
-
view
250 -
download
2
Transcript of Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing...
![Page 1: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/1.jpg)
Admixtures for Concrete
![Page 2: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/2.jpg)
Admixtures for Concrete
Admixtures Air-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures Hydration-control admixtures Corrosion inhibitors Shrinkage reducers ASR inhibitors Coloring admixtures Miscellaneous admixtures
![Page 3: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/3.jpg)
Admixtures for Concrete
Air-Entraining Admixtures
Improve durability in concrete exposed to Freeze-thaw Deicers Sulfates Alkali-reactive environments
Improve workability
ASTM C 260 or AASHTO M 154ASTM C 260 or AASHTO M 154
![Page 4: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/4.jpg)
Admixtures for Concrete
Frost Damage
![Page 5: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/5.jpg)
Admixtures for Concrete
Scaled Concrete Surface
![Page 6: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/6.jpg)
Admixtures for Concrete
Water-Reducing Admixtures
Reduce mixing water required to produce a certain slump
Reduce water-cement ratio Reduce cement content Increase slump
Primarily used to:Primarily used to:
![Page 7: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/7.jpg)
Admixtures for Concrete
Water Reducing Admixtures
Type A ― reduces water content at least 5% tends to retard ― accelerator
often added Type D ―
reduces water content 5% min. retards set
Type E ― reduces water content 5% min. accelerates set
ASTM C 494 or AASHTO M 194ASTM C 494 or AASHTO M 194
![Page 8: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/8.jpg)
Admixtures for Concrete
Water Reducer and Slump Loss
![Page 9: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/9.jpg)
Admixtures for Concrete
Retardation (Initial Set)
![Page 10: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/10.jpg)
Admixtures for Concrete
Retardation (Final Set)
![Page 11: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/11.jpg)
Admixtures for Concrete
Mid-Range Water Reducing Admixtures
Reduce water content 6% to 12%
Reduce cement content Reduce water-cement ratio No retardation Improve placeability and
finishability
![Page 12: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/12.jpg)
Admixtures for Concrete
![Page 13: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/13.jpg)
Admixtures for Concrete
High-Range Water-Reducing Admixtures
Reduce H2O content 12% -30% Reduced W/C produces conc.
with: Compressive Strength > 70 MPa Increased early strength gain Reduced Cl ion penetration
ASTM C 494 or AASHTO M 194 ASTM C 494 or AASHTO M 194
Type F― Water Reducing
Type G ― Water Reducing and Retarding
![Page 14: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/14.jpg)
Admixtures for Concrete
High-Range Water Reducer and Slump Loss
![Page 15: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/15.jpg)
Admixtures for Concrete
HRWR, Water Reducer and Air Loss
0.048825.66.8B0.065593.86.4M0.040714.86.8NHigh-range
water reducer
0.040744.66.2H0.038674.77.0LWater
reducer
0.020563.05.4CControlMixture
Rate of air loss,
%/minute
Percent air
retained
Final air content,
% *
Initial air content,
%
*at point where slump falls below 25 mm
![Page 16: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/16.jpg)
Admixtures for Concrete
Compressive Strength Development
![Page 17: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/17.jpg)
Admixtures for Concrete
Plasticizers for Flowing Concrete
Essentially High-Range Water Reducer
SuperplasticizersAlso known as ―
ASTM C 1017Type 1 ―Plasticizing
Type 2 ― Plasticizing and Retarding
![Page 18: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/18.jpg)
Admixtures for Concrete
Plasticizers for Flowing Concrete
Produce flowing concrete with high slump ( 190 mm [7.5 in.])
Reduce bleeding
Extended-slump-life plasticizer reduces slump loss.
ASTM C 1017ASTM C 1017
Superplasticizers
![Page 19: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/19.jpg)
Admixtures for Concrete
Flowing Concrete
![Page 20: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/20.jpg)
Admixtures for Concrete
Flowing Concrete as Thin Overlay
![Page 21: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/21.jpg)
Admixtures for Concrete
Flowing Concretes and Slump Loss
![Page 22: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/22.jpg)
Admixtures for Concrete
Retardation of Flowing Concrete (Initial Set)
![Page 23: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/23.jpg)
Admixtures for Concrete
Retardation of Flowing Concrete (Final Set)
![Page 24: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/24.jpg)
Admixtures for Concrete
Compressive Strength Development in Flowing Concrete
![Page 25: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/25.jpg)
Admixtures for Concrete
Bleeding of Flowing Concrete
![Page 26: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/26.jpg)
Admixtures for Concrete
Retarding Admixtures
Delay setting or hardening rate for:
Hot-weather concreting Difficult placements Special finishing processes
ASTM C 494 or AASHTO M 194, Type BASTM C 494 or AASHTO M 194, Type B
![Page 27: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/27.jpg)
Admixtures for Concrete
Slump Loss at Various Temperatures
![Page 28: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/28.jpg)
Admixtures for Concrete
Accelerating Admixtures
Accelerate the rate of: Hydration (setting) Early-age strength gain
ASTM C 494 or AASHTO M 194, Type CASTM C 494 or AASHTO M 194, Type C
Calcium chloride accelerators: Increase drying shrinkage,
potential reinforcement corrosion, potential scaling
Darken concrete
![Page 29: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/29.jpg)
Admixtures for Concrete
Maximum Chloride-Ion Content
0.30Other reinforced concrete construction
1.00Reinforced concrete that will be dry or protected from moisture in service
0.15Reinforced concrete ex-posed to chloride in service
0.06Prestressed concreteType of member
Maximum water soluble chloride-ion (CI¯) in
concrete, percent by mass of cement
![Page 30: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/30.jpg)
Admixtures for Concrete
Corrosion Inhibitors
Control Corrosion of Steel Reinforcement
Dosage dependent on anticipated chloride level
![Page 31: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/31.jpg)
Admixtures for Concrete
Shrinkage-Reducing Admixtures
![Page 32: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/32.jpg)
Admixtures for Concrete
ASR Inhibitors—Lithium Carbonate
![Page 33: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/33.jpg)
Admixtures for Concrete
Coloring Admixtures (Pigments)
![Page 34: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/34.jpg)
Admixtures for Concrete
Liquid Admixture Dispenser
![Page 35: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/35.jpg)
Admixtures for Concrete
Videos 1/2
Air-Entraining Admixture Water Reducer
![Page 36: Admixtures for Concrete - College of · PDF fileAir-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures ... ASTM C 260 or AASHTO](https://reader034.fdocuments.in/reader034/viewer/2022052209/5a796c107f8b9ade698b550a/html5/thumbnails/36.jpg)
Admixtures for Concrete
Videos 2/2
Retarder/Accelerator Admixture Dispenser