High Performance Admixture for Grout for Prestressing Tendons

High Performance Admixture for Grout for Prestressing Tendons

m50

Product Description

m50 is a cement-based pumpable grout with specially graded aggregate. It produces a pumpable, nonbleeding, high-strength fluid product with an extended working time. The specially graded spherical aggregate mitigates chloride migration while still allowing the product to be easily pumped over long distances through small openings. m50 meets all the compressive strength and volume change requirements ASTM C 1107 (CRD C621) at a fluid consistency.

Standard Compliance

Meets all compressive strength and settlement shrinkage requirements at a fluid consistency per ASTM C 1107 (CRD 621)

Uses

1.It’s mainly used for grouting of prestressed ducts and anchoring systems, grouting of joints to stop leakage, and curtain grouting.
2.It’s suitable for use in concrete ducts of railway, road, bridge, nuclear power station etc which is subject to adhesion stress.

Features

1.It’s a new type admixture which is compounded from inorganic functional material with organic high polymer material.
2.Because of low alkali content, it’s nontoxic, noncorrosive and no damage to steel bars. It’s easy to use and has stable quality.
3.It has perfect flowability and good fillability. It flows freely even in irregular shapes to get self compaction.
4.It has slight expansiveness which compensates shrinkage of cement laitance resulted from drying or temperature difference ensuring volume stability of the laitance after it cures. It prevents water bleeding, ensures laitance stability and brings high compressive strength and adhesion after the laitance cures.

Typical Advantages

• High compressive strengths
• Hardens without bleeding, settlement,segregation, shrinkage or formation of voids
• Minimum 1 hour pumpability at 90°F (32°C)
• Compatible with high-strength steel
• Integral corrosion inhibitor for added protection of embedded steel reinforcement
• Easy to pump or pour for easy of placement
• Can be pumped or re-circulated for relatively long periods of time
• Can be used over a wide range of mixed grout and placement temperatures

Applications

• Pumping around post-tensioned tendons, cables, and high-strength rods to encapsulate and protect highly stressed steel from corrosion
• Placing around end sections of unanchored cables and rods for subsequent tensioning
• Filling voids in restricted spaces between wall panels, beams, and columns where grout will contact highly stressed steel
• Grouting cable anchor-plates or other plates where grout will contact highly stressed anchorages

Technical Data Sheet

Note:
1. water-binder ratio 0.28;
2. Expect reasonable variations from the results shown above. Control field and laboratory tests on the basis of the desired placing consistency rather than strictly on water content.

Dosage

Do trial mixes to determine dosage before use. Recommended dosage for the grouting agent powder is10% by weight of cement. Ordinary grouting agent is used when ambient temperature is above 15 celsius degree.

Usage

Cleaning–grouting agent mixing–grouting—curing

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