NAOMI QUIZZEZ

1 Which of the following is NOT a type of cement?

• A. Ordinary Portland Cement (OPC)

• B. Rapid Hardening Cement

• C. Fly Ash Cement

• D. Asphalt Cement

2. What is the main purpose of adding superplasticizers to concrete?

• A. Reduce curing time

• B. Increase heat of hydration

• C. Improve workability without increasing water content

• D. Prevent shrinkage cracks

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What refers to how easily freshly mixed concrete can be mixed, placed, compacted, and finished without segregation or bleeding. It indicates the ease of handling and the consistency of the concrete mix.

(a)  

Which factor increases the workability of concrete?

• a) Decrease in water-cement ratio

• b) Use of angular aggregates

• c) Addition of superplasticizers

• d) Excessive vibration

What is the main purpose of performing a concrete slump test?

• To check the concrete mix design for strength.

• To assess the workability and consistency of the concrete.

• To determine the water-cement ratio of the concrete.

• To measure the curing time of the concrete.

When taking a concrete sample for a slump test, what is a crucial step to ensure an accurate representation of the mix?

• The sample must be taken from the very first discharge of concrete.

• The sample should be taken after 0.2 m³ of concrete has been discharged and then thoroughly mixed.

• The sample should be vibrated for at least 30 seconds before testing.

• The sample must be cooled to a specific temperature before testing.

What is the correct procedure for filling and compacting the concrete in the slump cone?

• Fill the cone in two layers, compacting each layer 15 times.

• Fill the cone in three layers, compacting each layer 25 times.

• Fill the cone in a single layer and compact it thoroughly.

• Fill the cone in four layers, compacting each layer 20 times.

Which of the following properties is not directly checked by a concrete slump test?

• Workability of the concrete.

• Consistency of the concrete mix.

• The amount of water in the concrete.

• The ability to pump and place concrete without issues.

How should a measured slump value of 87mm be reported?

• 87mm

• 85mm

• 90mm

• 80mm

If the specified slump for concrete is 80mm, what is the permissible tolerance?

• ±10mm

• ±15mm

• ±20mm

• ±30mm