Masonry Level 1 - Module 5

The amount of material in a 94-pound bag of porland cement is _________________.

1 cubic foot

A mixing specification for mortar of 1:1:6 indicates _______________.

1 part portland cement, 1 part lime, 6 parts sand

In cold weather, consider heating water for mortar mixing when the air temperature is below _______________.

40^F

The brick Industry Association defines cold as any temperature below _________________.

40^F

additives put into mortar to change its appearance or properties are called ___________________.

Admixtures

The ASTM standard that applies to preblended mortar is _________________.

C270

Mortar that is to high in cement content is commonly referred to as ______________________.

Fat or rich

The chemical reaction between cement and water that hardens the mortar, which requires the presence of water and optimal air temperatures.

Hydration

Portland cement types that are used for concrete, rather than mortar, are Types __________________.

IV an V

Sand for use in mortar is usually stored _________________.

In a loose pile on the ground

Flexibility is a mortar property that is provided by the ingredient __________________.

Lime

The ingredient of cement that causes hydration of mortar by reaction with water and air is ___________.

Lime

Lime reduced by mixing with water to a safe form form that can be used in the production of mortar.

Slaked lime

In order fro efflorescence to occur, two things must be present in a wall _________________.

Soluble salts and moisture

Efflorescence on a masonry surface appears _______________.

Soon after the wall is built

The mixer should be located as close as possible to ______________________.

The main section of the work

The amount of air contained in the mortar mix is determined by ________________.

The range of sand particle sizes and grades

Tempering mortar is permitted only ______________.

To replace moisture lost trough evaporation

Mortar that is sometimes used for reconstruction of historic buildings is ____________.

Type K

The type of mortar that is often interchanged with Type is ___________________.

Type S

Of the five types of portland cement, the types that are generally only used for mortar are __________________________.

Types I, II, and III

A mortar joint made with properly proportioned mortar will ___________.

Shrink

An admixture added to mortar to increase microscopic air bubbles in mixed mortar.

Air-entraining

The term used to describe how well the mortar sticks to the masonry units is ______________________________.

Cohesion

The ability of the mortar to withstand crumbling under pressure is called __________________________.

Compressive strength

For the majority of masonry construction, the most important property of mortar is _______________.

Extended of bond

Adhesion of mortar to masonry units as determined by its lime and moisture content.

Extent of bond

Masonry cement is made in grades ______________________.

M, S, N, and O

Cement that has been modified by adding lime and other materials.

Masonry cement

The most cases, during warm weather sand does not need to be protected from __________________.

Moisture

The ability of mortar to flow like a liquid and not form cracks or break part.

Plasticity

An admixture that adds workability to mortar is called a(n) ______________.

Plasticizer

The major cause of improper proportioning of materials when mixing mortar is __________________.

Poor work techniques

The main ingredient in mortar is _____________.

Portland cement

The only type of hydrated lime that should be used in mortar is Type __________.

S

The compressive strength of mortar and concrete are ______________.

The cement content increases

The water-cement ratios for mortar and concrete are _______________.

Very different

The ability of mortar to keep sufficient water in the mix to enhance plasticity and workability and to decrease the need to temper.

Water retention

To prevent mortar from cracking on the mixing paddles, ___________________.

Wet the drum with small amount of water before you add dry material

When using a mortar mixer and the mixing is complete, grasp the drum handle and dump the mortar into the wheelbarrow or mortar box _______________________.

While the drum is still turning

Property of mortar to remain soft and plastic long enough to allow the masons to place and align masonry units and strike off the mortar joints before the mortar hardens completely.

Workability