Mixing Materials

What is the purpose of adding plasticiser to mortar?

• To make the mix harder
• To create a smoother and more adhesive mix
• To increase the sand content
• To reduce the need for cement

Which legislation requires PPE to be worn on construction sites?

• COSHH Regulations
• The Health and Safety at Work Act 1974
• RIDDOR
• Building Regulations 2010

What is the ratio of cement to sand in a standard mortar mix?

• 1:3
• 1:5
• 1:4
• 1:6

What is the recommended mixing time for sand and cement to allow the plasticiser to work effectively?

• 10 minutes
• 15 minutes
• 20 minutes
• 25 minutes

Which type of cement is most commonly used in bricklaying?

• White cement
• Hydraulic cement
• Ordinary Portland Cement (OPC)
• Sulphate-resistant cement

What does an accident book help comply with?

• COSHH
• RIDDOR
• Building Regulations
• CDM Regulations

What is a common work-related injury caused by wet cement?

• Burns
• Fractures
• Concussions
• Cuts

How can wet concrete be protected from rain after pouring?

• Cover it with a tarpaulin
• Build a polythene tent
• Sprinkle sand over it
• Leave it uncovered

What is the main purpose of curing concrete?

• To increase its colour
• To maintain moisture and temperature for hydration
• To remove air bubbles
• To make it waterproof

What is the recommended concrete mix ratio for general domestic jobs?

• 1:2:4
• 1:3:6
• 1:4:5
• 1:5:7