Sikament® RB 623

Sikament® RB 623 follows the requirements of ASTM C494 Type B & D, EN 934-2: T11.1/11.2 and IS 9103

12 months from date of production if stored properly

Store in undamaged, unopened, original sealed packaging in dry conditions at temperatures between +5°C and +50°C. Mix well before using.

~1.22 kg/l at 25º C

≥ 6

Nil

Sikament® RB 623 is compatible with most admixtures used in the production of quality concrete including normal, other mid-range and high-range water-reducing admixtures, air entrainers, accelerators, retarders, extended set control admixtures, corrosion inhibitors, and shrinkage reducers.
Sikament® RB 623 is also compatible with slag and pozzolans such as fly ash, metakaolin and silica fume.

Sikament® RB 623 is a ready-to-use liquid which is dispensed into the concrete together with the mixing water.
The plasticising effect and water reduction are higher if the admixture is added to the damp concrete after 50 to 70% of the mixing water has been added. The addition of Sikament® RB 623 to dry aggregate or cement is not recommended.
When using Sikament® RB 623 to produce flowing concrete at site using ready mix trucks, it can be added to the concrete via the feed hopper at the rear of the truck. Mix before discharge for 5 minutes at 10 rpm to produce a fully homogenous mix.

Optimum dosage of Sikament® RB 623 should be determined with trial mixes. As a guide, a dosage range of 400ml to 1200ml per 100kg of cementitious material is recommended as a starting point. In high performance concrete a dosage upto 1800ml per 100kg of cementitious material can be added subject to prior site trials.Because of variations in concrete materials, job site conditions, and/or applications, dosages outside of the recommended range may be required. In such cases, contact your local Sika representative.
For additional information on Sikament® RB 623 admixture or on its use in developing concrete mixes with special performance characteristics, contact your local Sika representative.

 
Effects of over dosage
A severe over-dosage of Sikament® RB 623 can result in the following:

• Long extension of initial and final set
• Increase in air entrainment
• Bleed/segregation of mix, quick loss of workability
• Increased plastic shrinkage

A slight overdose may not adversely affect the ultimate strength of the concrete and can achieve higher strengths than normal concrete, provided it is properly compacted and cured. Due allowance should be made for the effect of fluid concrete pressure on form work, and stripping times should be monitored.
In the event of over dosage, consult your local Sika representative immediately.