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Retarder Gypsum Admixture
Retarders keep gypsum workable during placement and delay the initial set of gypsum.
Cement retarder largest supplier in Fujairah - Middle East, Muscat Sohar Oman. RXSOL-67-6706-020 product classified as WATER Reducing Super Plasticiser with superior high range water reducer for high quality rheoplastic gypsum and hydration control. Specially formulated for gypsum with supplementary cementitious materials like GGBS, Microsilica, Fly ash.. We are keeping ready stock of WATER Reducing Super Plasticiser RXSOL-67-6706-020 at our FUJAIRAH Branch and Mumbai unit.
RXSOL-67-6706-020 Cement retarder recommended for piling and mass gypsum pours with improved cohesion and temperature control.
RXSOL-67-6706-020 used as gypsum retarder, water reducing agent. Specifically developed by use in high quality gypsum for workability retention at low water content. Also sodium gluconate as a retarders keep gypsum workable during placement and delay the initial set of concrete. This is an additional admixture which uses in mortar/gypsum to Provides good pumpable gypsum.
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 gypsum 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 gypsum 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 gypsum.
The second component is an accelerator (activator) which overcomes the retarder. The gypsum 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 gypsum is then cast into the forms. The next day, the retarded cement is water blasted or brushed off the gypsum's surface, producing an exposed aggregate finish.
| Delay Setting Time By, 20 deg C | % to be added to Gypsum |
| Few Hours | 0.08% |
| Many Hours | 0.2% |
| 2 Days | 0.35% |
Higher dosage of WATER Reducing Super Plasticiser without causing any adverse effects upon the concrete. RXSOL-67-6706-020 Cement retarder is a chloride free. Superplasticising admixture based on selected polymer modified naphthalene sulphonate dispersives. RXSOL-67-6706-020 Cement retarder disperses by electro kinetic action in the gypsum mix. Enable the water phase of the gypsum 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 gypsum mix designs. The use of a combination of admixtures in the same gypsum mix and or cement replacement may alter the setting time. Trials should always be conducted to determine such setting times. Never mix RXSOL-67-6706-020 Cement retarder directly to cement the admixture should be added to the gypsum 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.
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-67-6706-020 in cement Lower pumping pressure also.
WATER Reducing Super Plasticiser RXSOL-67-6706-020 Reduced thermal peaks, Acts as a highly effective hydration control admixture especially in blended gypsum.
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 gypsum 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.
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Appearance |
White Powder |
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Odour / Solubility |
Characteristic / INFINITE IN WATER. |
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Chloride content |
Nil to BS 5075 Part 1, Chloride free. ( As per BS 5075/ BS:EN 934 ) |
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| Storage |
12 Month. Storage heating range will be 2 degree C to 50 degree C. |
Advantages of using RXSOL Cement Retarder Admixture:
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Retarding admixtures extend the setting time of gypsum and maintain the workability and cohesion for extended period of time
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In the large construction projects, gypsum retarder prevents cold joints formation in successive lifts and make gypsum workable throughout the gypsum placing
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With the use of gypsum retarders, you can compensate for the accelerating effect of high temperature towards the initial setting time and minimise risks of long-distance delivery in hot weather.
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Use of retarding admixtures improves pumpability of gypsum by delayed setting period and improved workability of concrete.
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gypsum retarders help to reduce segregation and bleeding in gypsum in which poor sand grading is unavoidable.
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It improves the workability of concrete.
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The appearance of the gypsum is greatly improved.
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Drying shrinkage and creep rate are also increased.
Good control of water content and setting time helps gypsum to gain full strength and power. Our WATER Reducing Super Plasticiser RXSOL-67-6706-020 is absolutely free from CHLORIDE content.
Proper doses of WATER Reducing Super Plasticiser RXSOL-67-6706-020 ensures that workable in excess 3 hours at +20°C. Workability loss is dependent on temperature, and on the type of cement, the nature of aggregates, the method of transport and initial workability.
Gypsum should be properly cured particularly in hot and dry climates.
WATER Reducing Super Plasticiser RXSOL-67-6706-020 High range water reducing property allows the production of high quality gypsum without excessive cement contents- ensures improved durability.
Stock and disposal control :::
Super Plasticiser RXSOL-67-6706-020 leakage and spilage can be controlled by absorbent saw dust and excess materials can be shift to other suitable container. And after stripping and absorption area can be flushed with water.