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Mortar accounts for approximately 17.5% of the brickwork built in stretcher bond and therefore it is important to consider the correct selection of mortar, which can be designed or prescribed in accordance with BS EN 998-2, Specification for mortar for masonry.
Explanation of mortar mix ratio notation. The first digit, or first two digits of a mix proportion refer to the binder content (i.e. lime or cement or both) and the last digit always refers to the filler, which is usually sand.
Site mixing: Mortar should be mixed by hand or machine until it has a uniform colour throughout. Note: Shovel mixing of mortars can cause apparent colour changes in the nished masonry, particularly if pigments are included.
Mortar is a workable paste used to bind bricks and other masonry units together. A mortar joint acts as a sealant, a bearing pad, the glue that sticks the units together yet keeps them apart and, in this sense, performs as a gap-filling adhesive.
Mortar binds bricks and blocks together to give strength and stability to a wall. Freshly mixed mortar must be soft and plastic so that it spreads easily and makes good contact without becoming too strong. Too strong a mortar may crack and is wasteful and expensive. 1. Materials 1.1 Cement Preferred cement types are:
MORTAR GUIDE. The following calculations are based on approximately 0.6m3 (1.2T) of damp sand, which will lay approximately 1,000 standard bricks. The Lime ‘n’ Lite and Lime ‘n’ Grey products are pre-blended cement and lime at 1:1 by volume.
A mechanical bond is achieved as follows: The mortar should be mixed to a workable consistency and spread out over the top surface of the brick wythe. The mortar will fill the surface irregularities of the brick unit by the pressure applied by the mason laying the next course of brick.
