CBA ASSESSMENT

Which compound is added to cement clinker to delay setting time?

• 
  A) Silica
  

• B) Lime

• C) Gypsum

• D) Calcium chloride

Q2. What are the four main constituents of Portland cement

• A) Lime, Silica, Magnesia, Soda ash

• B) Lime, Silica, Soda, Sulphur

• C) Lime, Silica, Phosphorus, Alumina
  

• D) Lime, Silica, Alum

Which material is commonly used for thermal insulation in buildings?**
A) Concrete
B) Brick
C) Glass wool
D) Steel

• A) Concrete

• B) Brick

• C) Glass wool

• D) Steel

What is the main purpose of aggregates in concrete?**
A) Increase volume

• A) Increase volume

• B) Enhance color
  

• C) Improve compressive strength

• (D) Reduce cost

If concrete has medium workability, its slump value is approximately:**
A) 25–50 mm
B) 50–100 mm
C) 75–150 mm

• A) 25–50 mm
  

• B) 50–100 mm

• C) 75–150 mm

• D) 100–150 mm

Which test checks the soundness of cement?**

• A) Briquette test

• B) Briquette test

• C) Turbidity meter
  

• 
  D) Vicat’s apparatus

Which material is used as a waterproofing membrane for below-ground structures?**
A) Bitumen
B) Concrete
C) Gypsum
D) Aluminum

• A) Bitumen

• B) Concrete

• C) Gypsum
  C

• 
  D) Aluminum

psum in construction is primarily used for:**
A) Producing cement
B) Flooring
C) Making plaster of Paris
D) Waterproofing
Answer: C) Making plaster of P

• A) Producing cement

• B) Flooring

• C) Making plaster of Paris
  

• D) Waterproofing

Autoclaved aerated concrete (AAC) contains which additional component not found in ordinary concrete?**
A) Glass wool
B) Bitumen
C) Aluminium powder
D) Fiberglass

• 
  A) Glass wool
  

• B) Bitumen

• C) Aluminium powder

• D) Fiberglass

What is the typical shrinkage strain of ordinary concrete?**
What is the typical shrinkage strain of ordinary concrete?**
A) 0.1–0.3 mm/m
B) 0.3–0.6 mm/m
C) 0.6–1.2 mm/m
D) 1.2–2.0 mm/m

• What is the typical shrinkage strain of ordinary concrete?**
  A) 0.1–0.3 mm/m
  

• B) 0.3–0.6 mm/m
  

• C) 0.6–1.2 mm/m
  

• 
  D) 1.2–2.0 mm/m