What is the recommended water-cement ratio for a neat cement grout?

The W/C ratio is typically between 0.4 and 0.5, adjusted to achieve the required consistency (Clause 4.2.1).

What type of mixer is recommended for cementitious grouts?

A high-speed shear-type mixer, also known as a colloidal mixer, is recommended to ensure proper dispersion of cement particles (Clause 5.2).

What is the typical grouting pressure for filling cracks in concrete?

The pressure is generally limited to 0.3 to 0.4 N/mm² to be effective without causing further damage to the concrete (Clause 6.6).

What are the types of grout covered in this standard?

The code covers neat cement grout, cement-sand grout, and chemical grouts (specifically those that do not attack cement or steel) (Clause 4).

IS 6061

: 1971

Grouting for Concrete Structures - Code of Practice

CurrentSpecializedCode of PracticeStructural Engineering · Demolition, Renovation and Repair of Structures

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This code of practice covers the materials, equipment, and procedural guidelines for grouting in concrete structures. It details various grout mixes, including neat cement, cement-sand, and chemical grouts, and outlines the operational steps from preparation to injection for repair, strengthening, and filling voids.

Provides a code of practice for grouting of concrete structures for various purposes like crack repair and void filling.

Quick Reference Values

Typical W/C ratio for neat cement grout0.4 to 0.5

General grouting pressure for structural cracks0.3 to 0.4 N/mm²

Fineness modulus of sand for grout1.5 to 2.0

Typical diameter of grout holes25 to 75 mm

Flow time for neat cement grout using flow cone17 to 21 seconds

Practical Notes

This is an old (1971) standard and does not cover modern epoxy, polyurethane, or other polymer-based grouting materials in detail. Always refer to manufacturer's specifications for proprietary products.

Controlling the grouting pressure is critical to prevent further damage to the structure being repaired, a point stressed in Clause 6.6.

The success of grouting heavily depends on proper preparation, including cleaning the cracks/voids with compressed air and water, as described in Clause 6.3.