Retarder Cement Admixture

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Retarder Cement Admixture
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Construction Chem-67

Retarder Cement Admixture

SKU: RXSOL-67-6706-220
Retarders keep concrete workable during placement and delay the initial set of concrete.
Pack Size / Specification:
25, 60, 220 Kg liquid drum.
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Technical Specifications

 

Appearance

Brown Liquid

 

Odour / Solubility

Characteristic / INFINITE IN WATER.

 

Density

>1.15 at 25°C +/- 0.05

 

Chloride content

Nil to BS 5075 Part 1, Chloride free. Safe for use in precast prestressed and reinforced concrete. ( As per BS 5075/ BS:EN 934 )

 
Freezing Point:   Approximately -2 degree C.  

Freezing point:

Flashpoint:

0°C

N/A , Fire RXSOL-67-6706-220 is water based and non-flammable.

  
Storage

12 Month. Always stir well before use. And storage heating range will be 2 degree C  to 50 degree C.

  
Air Entrainment : Less than 2% additional air is entrained at normal dosages.
 



 

Application & Dosage

RXSOL-67-6706-220 used as concrete retarder, water reducing agent. Specifically developed by use in high quality concrete for workability retention at low water content. Also sodium gluconate as a retarders keep concrete workable during placement and delay the initial set of concrete. This is an additional admixture which uses in mortar/concrete to Provides good pumpable concrete.

These admixtures slow down the hydration process. They may also reduce the setting time of cement. Retarding admixtures fall into two categories: regular and extended-set. Regular, most commonly referred to as just “retarders,” are used to place concrete in hot climates when long travel times are expected or, in cases of emergency, when placement is delayed. They are also commonly used for mass concrete pours to prevent cold joints.
 
Extended-set control admixtures are those used to delay hydration for many hours or even days. These are usually two-component admixture systems. The first component is a retarder (stabilizer) which delays the setting of concrete.
 
The second component is an accelerator (activator) which overcomes the retarder. The concrete typically reaches the initial set in a few hours after the activator is applied. In the precast industry, retarding admixtures are also used as surface retarders. Surface retarders are used in making exposed aggregate architectural precast. They are typically sprayed or rolled onto the forms. The concrete is then cast into the forms. The next day, the retarded cement is water blasted or brushed off the concrete’s surface, producing an exposed aggregate finish.

Best dose rate can be determined in trial batch mixes. While In normal concrete a dosage of between 0.7-2.0 litre for 100kg. total cementitious material. In a high performance, low water cement ratio concrete, a dosage of between 1.5-3.5 litre / 100kg total cementitious material to to improve strengths. The addition of the admixture will allow the removal of water from the mix whilst maintaining workability.

Higher dosage of WATER Reducing Super Plasticiser without causing any adverse effects upon the concrete. RXSOL-67-6706-220 Cement retarder is a chloride free. Superplasticising admixture based on selected polymer modified naphthalene sulphonate dispersives. RXSOL-67-6706-220 Cement retarder disperses by electro kinetic action in the concrete mix. Enable the water phase of the concrete to perform more effectively.

After initial trials. Minor modifications to the overall mix design may be made to optimize performance.

Note : Initial trials should be made with normal concrete mix designs. The use of a combination of admixtures in the same concrete mix and or cement replacement may alter the setting time. Trials should always be conducted to determine such setting times. Never mix RXSOL-67-6706-220 Cement retarder directly to cement the admixture should be added to the concrete with the mixing water.

Overdose : Always take batch trial before uses of cement retarder. High dose will increase retardation effect and more curing required, How ever this may reduce the strength of concrete. But overdosing can be done if sulphate resisting cement or cement replacement materials are used. 

Related Information

Increasing the setting time of cement helps High workability for longer periods and if cocrete is going to pump for high rise presence of RXSOL-67-6706-220 in cement  Lower pumping pressure also. 

WATER Reducing Super Plasticiser RXSOL-67-6706-220 Reduced thermal peaks, Acts as a highly effective hydration control admixture especially in blended concrete.
Delayed setting with longer workability, Higher workability levels are maintained for longer than with sulphonated and naphthalene admixture. 
Higher ultimate strengths, Better rheological properties for concrete made with double or triple blends without abnormal retardation. 

Improved durability and Improved cohesion and particle dispersion minimizes segregation and bleeding and improves pumpability by reducing permeability.
 

WATER Reducing Super Plasticiser RXSOL-67-6706-220 is compatible with all types of Portland cements and cement replacement materials such as PFA GGBFS and microsilica.