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Transcript of Bricklaying
Artists in Clay The first evidence of brickwork in this country can be found in the remains of Roman ruins dating back almost two thousand years.
Hadrians wall has various examples dotted along its length.
The bricks were made from clay and fired in a primitve mobile kiln. Modern day bricklaying is to be seen
almost anywhere you look in any UK. City
As you start to develop your skills as a trainee bricklayer
you may find even holding the bricklayers trowel does not
feel very natural but with the correct training from the
tutors and use you will soon become accustomed to how
it feels and it will become an extesion of your hand. Bricks vary in both colour and texture and also material type, the most commonly used bricks are made from clay, some are made from concrete and some from calcium scilicate (sand and lime).
Clay bricks are normally extruded over dies and chopped to brick size
then fired in a gas heated kiln.
Concrete bricks are molded and allowed to cure then removed from the moulds.Calcium silicate bricks are moulded then steam cured in an oven. The standard dimension's of a brick are as follows 65mm thick, 102.5mm wide and 215mm long.Bricks can have indentations in one side which is refered to as a 'frog', some have various types of holes through the brick known as perforated and some bricks are manufactured with neither. The product that a bricklayer uses to build the wall with is made from a mixture of sand, portland cement,water and plasticiser.
These ingredients are usually mixed in a gravity drop mixing machine which can be powered by electric, petrol or diesel.
The mixed product is known as mortar.
The large bricklaying workshop mortar mixing machine is called a 'mortar pan' type which mixes horizontally. The ingredients are placed in the mixer in the following order, first in is the water then the plasticiser followed by approximatly half of the sand then all the portland cement and more water as required then the remainder of the sand.
The mix may need more water to achieve the correct consistency.
The ingredients must be throughly mixed so as to produce mortar of a consistent colour and strength. Workshop Mortar Pan Mixer Towable Gravity Type Mixer Powder Mortar Plasticiser Liquid Mortar Plasticiser Building Sand Bags Containing Dry Powdered
Ordinary Portland Cement
Philidelphia type bricklaying trowel Bricks made from clay with an indentation on one side (FROG). Packs of clay bricks without indents or perforations. Clay bricks with through holes (perforated) Rather ornate use of different coloured and textured clay bricks, but this shows how different apperances can be achieved. Martin J Whitaker.