Civ2043. Concrete Quality

Question 1

What is concrete quality?

Answer 1

Fulfillment of certain concrete properties and Performance measures to a specified standards to ensure that concrete can accomplish its intended function

Question 2

What is quality control?

Answer 2

Testing an analysis of properties and performance of representative sample of concrete to determine whether the specified standard is achieved within given cost allowances

Question 3

Sampling

Answer 3

Take samples of fresh concrete to test quality and ensure it meets design specifications

Question 4

Give two typical tests

Answer 4

-Slump test( indicate workability of fresh concrete)
- compressive strength( indicate strength behavior of hardened concrete)

N:B ( control standard 28 days strength)

Question 5

Give four types of strengths

Answer 5

1.(SCS) Specified characteristic strength( the strength that comes from the structural designer)
- strength below which no more than 5% of valid results May fall

2. Target average strength(TAS)– is the strength that is used by a person who designs the concrete mix TAS should be 1.64 standard deviation above SCS
3. Strength used in analysis
4. In-situ strength – strength of concrete in actual structure