MPA Quiz Mortar Data Sheets

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A multiple choice quiz linked to MPA (Mortar) data sheets

How many bricks approximately will 1 tonne of cement:lime:sand mortar lay? *

1 point

600

800

1,000

1,200

What type of mix is less able to accommodate movement due to temperature and moisture changes? *

1 point

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? *

1 point

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? *

1 point

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? *

1 point

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? *

1 point

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? *

1 point

Compressive strength

Lateral strength

Tensile strength

Horizontal strength

During summer working, why is there is a risk that the bond between the mortar and the brick may be adversely affected? *

1 point

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? *

1 point

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? *

1 point

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? *

1 point

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? *

1 point

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? *

1 point

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? *

1 point

Water soluble salts in building materials

Cold weather

Hot weather

Jointing the wall after the initial set has occurred

What does the test for water soluble chloride content determine? *

1 point

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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