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NHL Limes: Injection and Grouting – Guide

INJECTION
– PURE LIME
PUMP
NHL51bag + 10.5gal of water
Capacity: 35 cu. ft./hr
NHL 3.51bag + 10.5gal of water
Pressure: 45 PSI.
NHL 21bag + 14gal of water

To these mixes an addition of casein can be made (1% of weight of the lime) to increase fluidity if so required. If casein is added the water addition can be reduced between 25% and 50%. Obviously NHL 2 mixes are more fluid than NHL 3.5 or 5

Use a non-cavitating whisk (1500/2000 revs per minute) to ensure total homogenization.

GRAVITY FILL MORTAR.

Sand:
fine (01/02max)
WATER ADDITION
NHL
5
1bag + 10.5gal of sand (55kg.approx)Enough
to obtain a paste with the required fluidity. Much less water is required if casein
is added.
NHL 3.51bag + 10.5gal of sand (55kg.approx)
NHL 21bag + 14gal. of sand (70kg.approx)

Casein addition is possible (see above).

General:
Where open joints in the masonry show cavities, they should be marked as reference points. Point up open joints in masonry before grouting begins. Allow to settle and top up as necessary. Leave to cure for up to 3 or 4 weeks depending on the lime grout used before removing small areas of pointing to check the cavities are completely filled. Weep holes may be required to check the grout distribution.

The addition of casein will increase the compressive strength and the set whilst improving flow and reducing the water demand.  Shrinkage, already low in NHL products and mortars, will be further reduced due to the lower  water content of the grout.

This document is a guide only and is not intended to be a specification. Its purpose is to provide the reader with helpful information that may assist in determining the correct choice of materials, methods of application and determine the best working practice. The guidelines refer to our experience with St. Astier NHL binders and some recommendations might not be applicable to other products.

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