Sikament® RB 918 (formerly MasterRheobuild® 918)

Description

Uses

Sikament RB 918 Admixture is suitable for:

• Ready-mix concrete operations.
• Projects requiring long-distance concrete transportation.
• Pumped concrete for vertical and horizontal applications.
• Mixes containing supplementary cementitious materials like granulated slag or pozzolans.
• Mass concrete pours.
• Hot weather concreting scenarios.

Key Features & Advantages

• Reduces heat of hydration and minimizes thermal peaks.
• Maintains high workability over extended periods.
• Lowers pumping pressure during concrete placement.
• Enhances segregation resistance, even at high workability levels.
• Offers extended setting times with prolonged workability retention.
• Reduces water demand for a given level of workability.
• Improves ultimate compressive strengths.
• Decreases permeability for enhanced durability.
• Reduces shrinkage and creep.
• Simplifies concrete finishing processes.
• Reduces overall construction costs.

Compliance Standards

Sikament RB 918 Admixture meets the requirements of:

• ASTM C-494 (Types B, D, and G).
• EN 934-2: T11.1/11.2.
• IS 9103.

Product Details

• Packaging: Available in 235 kg drums or bulk upon request.
• Shelf Life: 12 months when stored in unopened, original packaging under recommended conditions.
• Storage: Must be stored above +5°C. If frozen, thaw at temperatures above +5°C and gently agitate before use. Protect from direct sunlight and temperature extremes.
• Appearance/Color: Dark brown, free-flowing liquid.
• Specific Gravity: 1.1 ± 0.02 at 25°C.
• pH Value: > 6.
• Chloride Ion Content: < 0.2%.

Compatibility

Sikament RB 918 Admixture is compatible with various concrete admixtures, including normal, mid-range, and high-range water reducers, air entrainers, accelerators, retarders, and shrinkage reducers. It can also be used with supplementary materials like fly ash, silica fume, and slag.

Dosage Guidelines

• Recommended dosage: 400–1200 ml per 100 kg of cementitious material.
• For high-performance concrete, dosages up to 1800 ml per 100 kg may be used after site trials.

Effects of Overdosage:

• Significantly extended setting times.
• Increased air entrainment and potential for segregation.
• Higher plastic shrinkage.
  Proper compacting and curing may mitigate negative effects of minor overdoses and could result in higher strengths.

Application Instructions

• Sikament RB 918 Admixture should be added to the mixing water or to damp concrete after 50–70% of the water has been incorporated.
• Direct addition to dry aggregates or cement is not recommended.
• Use automatic dispensers for accurate dosing.

Additional Notes

• Workability retention with Sikament RB 918 Admixture exceeds 2 hours at +25°C.
• Workability may vary based on factors like temperature, cement type, and aggregate characteristics.
• Proper curing is essential, especially in hot, dry, or windy conditions.