MPA Quiz Mortar Data Sheets
A multiple choice quiz linked to MPA (Mortar) data sheets
How many bricks approximately will 1 tonne of cement:lime:sand mortar lay?
What type of mix is less able to accommodate movement due to temperature and moisture changes?
A leaner mix
A weaker mix
A stronger mix
A lighter mix
Why are the use of anti-freeze agents not generally recommended for masonry mortars?
The climate is never cold enough to justify use
Anti-freeze agents are not recognised by a British or European standard
They cause discolouration in the mortar
They reduce the workability of mortar
Why is it recommended that you build a small trial panel when using coloured mortar?
To ensure the mortar bonds to the brick
To ensure that the mortar sets correctly
To ensure that the interaction of the texture and colour on the brick produce the desired result
To ensure that the correct joint finish can be applied consistently to the walling
When using 'factory produced ready to use mortar' what must not be carried out once the initial set has started?
The mortar must not be re-constituted
The mortar in the joints must not be brushed
The mortar must not be disposed of by the operatives on site
The mortar must not be left in direct sunlight
At what temperature is it inadvisable to proceed with the construction of masonry?
If the temperature is below freezing
If the temperature is below 1 degree Celsius and falling
If the temperature is below 2 degrees Celsius and falling
If the temperature is below 3 degrees Celsius and falling
Which of the following is a common strength test of mortar?
During summer working, why is there is a risk that the bond between the mortar and the brick may be adversely affected?
Bricks may increase in size in the heat
To much water may evaporate from the mortar
Cement will separate from the sand in the heat
Efflorescence is more prevalent in the summer months
Whilst ensuring bed joints are level and even, what is also considered good practice?
Laying a course from left to right
Removing mortar from the rear 20% of the width of the brick to keep the cavity clean
Not creating excessive furrowing in the mortar bed
Pointing each brick after you have laid it.
When mortar joints are in poor condition and repointing is necessary, what is the minimum depth recommended for raking out prior to repointing?
To a minimum of 10mm
To a minimum of 15mm
To a minimum of 20mm
To a minimum of 25mm
What is an air entraining / plasticizing admixture used for in mortar production?
It increases the workability of the mortar
It makes the mortar set more quickly
It retards the setting action of the mortar
It improves the colour of mortar
Why would you add a permeability reducer to mortar?
To ensure that the mortar can be pointed at a later date
To quicken the setting time
To make the hardened mortar less porous
To slow down the setting time
What does the workable life measurement of mortar determine?
How old the cement is
The time taken for mortar to stiffen to a point where it is no longer usable
The time taken for the mortar to harden sufficiently to carry a load
The amount of mixing time required to produce a usable mortar
What causes efflorescence?
Water soluble salts in building materials
Jointing the wall after the initial set has occurred
What does the test for water soluble chloride content determine?
The source of water in a mortar mix
The effectiveness of mortar to withstand extreme weather conditions
To ensure that metal components built into masonry walling are not prone to corrosion
The porosity of masonry materials
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