Fosroc

Fosroc Conbextra GP2 Cementitious Grout

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Product Information

Product Overview

The Fosroc Conbextra GP2 Cementitious Grout is a high-strength, non-shrink, chloride-free precision grout for gaps from 10 to 100 mm. A gaseous expansion system counters settlement and shrinkage, so the grout stays in full contact under base plates and transfers load completely.

Mixed to a flowable consistency, it reaches at least 55 N/mm² at 7 days and about 65 N/mm² at 28 days, which makes it the choice for machine base plates, column anchoring, precast joints and void repairs. A 25 kg bag takes 4.0–4.5 litres of water and must be poured within 15–20 minutes.

Key Features

Non-shrink gaseous expansion
55 N/mm² at 7 days, 65 N/mm² at 28 days
Free-flowing, fills voids without air pockets
Chloride-free, safe for reinforcement
For gaps of 10–100 mm

Ideal For

Machine and turbine base plates
Column and anchor-bolt grouting
Precast concrete connections
Honeycomb and void repairs

Installation Guide

Prepare the formwork and pre-soak the concrete, removing standing water.
Mix 25 kg of powder with 4.0–4.5 litres of clean water using a mechanical mixer or slow drill and paddle for 3–5 minutes.
Pour continuously from one side within 15–20 minutes.
Keep exposed surfaces damp for at least 7 days.

Good to Know

Never add water to stiffening grout or vibrate it. Discard it instead.
Hand mixing is not recommended.

Frequently Asked Questions

Does it shrink?

No. Its expansion system keeps full contact as it sets.

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Product Specifications

Brand	Fosroc
Category	Waterproofing Materials
Manufacturer	Fosroc
Type	High-strength, non-shrink, cementitious precision grout
Gap Range	10 mm to 100 mm
Consistency	Flowable or fluid
Expansion System	Gaseous expansion, activated by water
Compressive Strength — 7 Days	55 N/mm² minimum (flowable consistency)
Compressive Strength — 28 Days	65 N/mm² (flowable consistency)
Fresh Density	~2220 kg/m³
Water per 25 kg Bag	4.0 to 4.5 litres of clean water
Mixing	Mechanical mixer or slow-speed drill with grout paddle, 3 to 5 minutes
Working Time	Pour within 15 to 20 minutes of mixing; initial set about 20–30 minutes at ~30°C
Curing	Keep exposed surfaces damp for at least 7 days
Composition	Chloride-free
Packaging	25 kg bag
Sold by	Identity Retail Innovations Private Limited