Fichas
Specifying and grading materials
Fichas del conjunto (15)
- 1What letters are used to show that a material complies with British Standards ?BS
- 2What letters are used to show that a material complies with European Standards ?EN
- 3If a material specification includes both BS and EN standards next to a material, what does it mean ?That the material has met both the British and European standards.
- 4How is the strength of a material calculated ?The strength of a material is calculated by working out how much pressure it can take. This pressure is measured in Newtons per square millimetre (N/mm2)
- 5When specifying concrete what does the number next to the letter C mean ?The number next to the C relates to the strength of the concrete, the higher the number the, the stronger the cement is.
- 6If concrete is going to be used to take the load of a structure, what is the minimum specification that should be used ?C25
=
concrete with a strength of 25N/mm2 - 7When specifying timber, what does C mean?Coniferous
=
Softwood - 8When specifying timber, what does D mean?Deciduous
=
Hardwood - 9What is the classification code for a softwood that has the strength of 50 Newtons per square millimetre?C50 N/mm2
- 10What does the classification code of this timber mean? D70 N/mm2D = Deciduous = Hardwood
70 N/mm2 = 70 Newtons per millimetre square.
D70 N/mm2 = A Hardwood that has the strength of 70 newtons per millimetres square. - 11What is the minimum strength requirement for bricks?5 N/mm2
- 12How are bricks classified?By strength and how much moister they can absorb.
- 13What is hardcore (AKA aggregate) a mix of ?Gravel
Sand
Broken bricks
and
Crushed concrete - 14How is aggregate classified ?Based on the size of the pieces of material in the mixture.
Higher number = larger pieces. - 15mortars are classified in two ways can you explain them?1) Classified according to where they will be used e.g. masonry wall
2) Classified based on how they are made e.g. factory-based or site-based.
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- Descripción
- BRLevel 2 (Unit 1 - Construction Technology) Construction Fichas sobre Specifying and grading materials, creado por gareth powell el 08/02/2016.
- Creado por
- gareth powell
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- Creado por gareth powell · 8 feb 2016
- Copiado por gareth powell · 8 feb 2016
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