HNC - Science and Materials - Dudley College

Strength is:

• the ability of a material to absorb forces and flex in different directions, returning to its original position.

• the ability of a material to stand up to forces being applied without any failure or damage.

• refering to the number of pores that are present within a material.

--------- refers to the amount/speed of heat and electricity that can be transmitted through a material

• Thermal transmittance

• Thermal expansion

• Thermal and electrical conductivity

• Thermal resistance

---------- is the ability of material to exist for long time without significant damage by resisting internal and external effects

• Elasticity

• Workability

• Viscosity

• Durability

A ----------- can be considered workable if it is easily transported, placed, compacted and finished without any segregation.

• Steel

• Brick

• Concrete

• Wood

Degree of workability could be very low if the slump of concrete is:

• 25 - 50 mm

• 100 - 175 mm

• 0 - 25 mm

• 50 - 100 mm

The unit of density is:

• kg/m³

• m³/kg

• W/m² K

• N/mm²

U-value is a good measure of thermal efficiency of construction materials. Select the best thermal insulation materials which has U- value equal to:

• 16 - 43 W/m²K

• 0.12 – 0.19 W/m²K

• 0.15 - 1.8 W/m²K

Viscosity is related to --------------- ; the thicker a product, the harder is to be used or applied.

• elasticity

• durability

• density

• workability

-------------- has very high tensile and compression strength, but can lose its strength in fire attacks if it is not protected.

• Concrete

• Plastic

• Steel

• Wood

Compressive Strength of Concrete ranges between:

• 5N/mm² - 100N/mm²

• 20N/mm² - 40N/mm²

• 8N/mm² - 30N/mm²

• 400N/mm² - 1000N/mm²