Podcast
Questions and Answers
What are the main components of mortar for masonry work?
What are the main components of mortar for masonry work?
- Clay, cement, and sand
- Concrete, aggregate, and water
- Gravel, water, and gypsum
- Sand, cement or lime, and water (correct)
Why should the thickness of mortar in brickwork not exceed 15 mm?
Why should the thickness of mortar in brickwork not exceed 15 mm?
- To improve aesthetics
- To prevent water penetration
- Due to high shrinkage (correct)
- To increase strength
What is the function of mortar in masonry work?
What is the function of mortar in masonry work?
- Act as a decorative element, provide structural support, and prevent water penetration
- Create microcracks within the bricks or blocks, enhance the strength of the units, and provide vertical support
- Joint the units together, seal any gaps to resist wind and rain penetration, and take up the tolerances between building units (correct)
- Increase the weight of the brick, improve the aesthetic appearance, and resist movement
What is one of the requirements for mortar in masonry work?
What is one of the requirements for mortar in masonry work?
Why should mortar permit movement in masonry work?
Why should mortar permit movement in masonry work?
What type of sand is recommended for mortar in masonry work?
What type of sand is recommended for mortar in masonry work?
What is the result of using sand containing silt and clay in mortar?
What is the result of using sand containing silt and clay in mortar?
What is the principal binding ingredient in modern binders?
What is the principal binding ingredient in modern binders?
What does non-hydraulic lime lack, resulting in poor water retention?
What does non-hydraulic lime lack, resulting in poor water retention?
What does adding air-entraining agent as a binder supplement accomplish?
What does adding air-entraining agent as a binder supplement accomplish?
When is sulphate resisting Portland cement used in place of Ordinary Portland cement?
When is sulphate resisting Portland cement used in place of Ordinary Portland cement?
What is the effect of air entrainment exceeding 12% of the volume?
What is the effect of air entrainment exceeding 12% of the volume?
Which type of masonry unit has a coefficient of linear thermal expansion between 11 - 15 x 10^-6/K?
Which type of masonry unit has a coefficient of linear thermal expansion between 11 - 15 x 10^-6/K?
What are the properties achieved by using cement and sand (1:3) by volume?
What are the properties achieved by using cement and sand (1:3) by volume?
What is the main drawback of using sand lacking in finer particles in mortar?
What is the main drawback of using sand lacking in finer particles in mortar?
Study Notes
Mortar Components
- Main components of mortar for masonry work: cement, sand, water, and lime
Mortar Thickness
- Thickness of mortar in brickwork should not exceed 15 mm to ensure adequate bond strength
Mortar Function
- Function of mortar in masonry work: to bond masonry units together, fill gaps, and provide a level surface
Mortar Requirements
- One of the requirements for mortar in masonry work: to permit movement in masonry work to accommodate thermal and moisture changes
Sand Requirements
- Recommended type of sand for mortar in masonry work: clean, sharp, and free from impurities
- Effect of using sand containing silt and clay in mortar: reduces mortar strength and workability
Binders
- Principal binding ingredient in modern binders: cement
- Non-hydraulic lime lacks: water retention, resulting in poor durability
Air-Entraining Agent
- Adding air-entraining agent as a binder supplement: improves workability and resistance to freeze-thaw damage
Cement Types
- Sulphate resisting Portland cement is used in place of Ordinary Portland cement: in exposure to seawater, acidic, or sulphate-rich environments
Air Entrainment
- Effect of air entrainment exceeding 12% of the volume: reduces mortar strength and durability
Masonry Units
- Type of masonry unit with a coefficient of linear thermal expansion between 11 - 15 x 10^-6/K: extruded concrete masonry units
Cement and Sand Proportions
- Properties achieved by using cement and sand (1:3) by volume: suitable for general masonry work
Sand Quality
- Main drawback of using sand lacking in finer particles in mortar: reduces mortar workability and increases the risk of segregation
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Description
Test your knowledge about the composition and functions of masonry mortar, which is used to joint masonry units and resist wind and rain penetration. Learn about the requirements and components of mortar for masonry work.
