Set retarder(Set retarding admixture)

Set retarder(Set retarding admixture)
Set retarder is a kind of admixture that reduces the hydration speed and heat of cement or gypsum, prolonging the setting time, and has no adverse effect on the strength development of concrete in later period.
Technical Data
Index set retarder/Set retarding admixture powder
Appearance white powder/pale yellow powder
Solid Content (%) 97 min
PH Value 6-8
Heavy metals ug/g (%) 0.01 max
Chloride Content (%) 0.05 max
Sodium Sulphate Content (%) 0.05 max
Reduzate 0.3% max
Total Alkali Conten 1.0% max

 
Use of retarder:
1 Adjust the initial setting time and final setting time of fresh concrete to keep the concrete plastic for a long time according to the construction requirements, so as to facilitate the casting and forming.
2 The slump loss of concrete is controlled so that the concrete can keep good fluidity and workability in a long time and meet the requirements of pumping construction technology after long distance transportation.
3 The hydration heat of mass concrete is reduced and the exothermic peak is delayed.
4 Improve the compactness and durability of concrete. 
Effect of retarder on concrete slump and loss
Dosage (%) Slump retention/mm
Initial 30 min 60 min
0 190 160 130
0.03 215 180 130
0.05 220 190 170
0.07 220 230 230
0.10 240 240 230
0.15 230 240 240
 
Effect of retarder on setting time and compressive strength of concrete
Dosage (%) Setting time/min Retarded time/min Strength/Mpa
Initial set Final set Initial set Final set 3d 7d 28d 90d
0 670 1010 - - 21.2 30.6 40.5 44.7
0.03 850 1110 180 100 19.8 31.4 35.4 41.8
0.05 1100 1650 430 640 22.3 30.9 44.7 47.1
0.07 1510 2260 840 1310 20.6 34.2 46.8 52.3
0.10 1710 2470 1040 1460 12.1 29.0 36.2 40.9
0.15 2120 4350 1450 2810 - 19.5 25.6 26.5
 
Recommended dosage and usage
1.The dosage is generally 1.0-3.0% of the cementitious material. In the preparation of high strength concrete, the dosage can be 3.0-5.0%.The specific dosage should be determined by test.
2.Generally add into the mixer at the same time with the mixing water and stir until the specified time.
 
Package and Storage
Package:package with woven fabric bag with plastic liner, including 25kg/50kg bag.
Storage:It should be stored in a dedicated warehouse that is well-ventilated and dry.Its shelf life is one year, if after the expiration date, it can continue to use when the testing results fall within the established range.
Transportation:This product is non-toxic and non- explosive. It can be transported by truck, ship and train.


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