Fosroc Conbextra GP

Fosroc Conbextra GP | General purpose, high flow, Class A shrinkage compensated grout – (gaps 10mm to 100mm thickness)

Conbextra GP is a cementitious grout designed for various general-purpose applications like eliminating shrinkage when filling voids, grouting stanchion base plates, and anchoring fixings such as masts and anchor bolts. Here’s a breakdown of its uses, properties, and application instructions:

Uses

• General-purpose grouting for void filling and grouting between a base plate and substrate.
• Suitable for anchoring fixings like masts and anchor bolts.

Description

• Shrinkage-compensated (non-shrink) cementitious grout provided as a ready-to-use dry powder.
• Mixing with a controlled amount of clean water produces a flowing grout suitable for gap thicknesses from 10mm to 100mm.
• Contains graded fillers and chemical additives for controlled expansion in the plastic state, minimizing water demand and ensuring high early strength.

Advantages

• High ultimate strength and low permeability for durability.
• Gaseous expansion system compensates for shrinkage and settlement.
• Applicable through dry packing, ramming, trowelling, pouring, and pumping.
• Pre-packaged material ensures consistency.
• Develops high early strength without chlorides.
• No metallic iron content to cause staining.
• Non-hazardous per Australian Inventory of Industrial Chemicals.
• Non-shrink according to ASTM C1107:2020.

Properties

• Compressive Strength: Ranges from 34 to 75 MPa at 28 days depending on consistency.
• Flexural Strength: 13.6 MPa at 28 days.
• Setting Time: Initial set at 5.5 hours, final set at 7.5 hours.
• Fresh Wet Density: Around 2200 kg/m³ depending on consistency.
• Alkali reactive particles test: Non-reactive.

Application Instructions

Preparation

• Ensure the substrate is free from oil, grease, or loose material. Defective concrete surfaces should be cut back to a sound base.
• Abrade or roughen surfaces for maximum bond.
• Provide air pressure relief holes in the base plate.

Mixing

• Use a forced-action mixer for 3 to 5 minutes at a slow speed.
• Always add powder to water. Different consistencies require varying water amounts per 20kg bag.

Placing

• Place the grout within 20 minutes of mixing.
• Can be placed in thicknesses from 10mm up to 100mm in a single pour.
• Maintain continuous grout flow and ensure proper grout head.

Pumping

• Suitable for pumping with a maximum aggregate size of 0.7mm.

Curing and Cleaning

• Thoroughly cure exposed areas after completion of grouting.
• Clean tools and equipment immediately after use with clean water.

Limitations

• Consider low and high-temperature working conditions for optimum performance.
• Comes in 20kg moisture-resistant plastic bags.

These instructions guide the preparation, mixing, placing, and post-application care to ensure the effectiveness of Conbextra GP in various construction applications.