29 Questions
Which ASTM standard is the most common test for measuring the compressive strength of concrete?
ASTM C39
What is the minimum required cross-section for the flexural strength test of concrete as per ASTM C78?
6x6 inches
What is the purpose of conducting compressive and flexural strength tests on concrete?
To validate the proper construction procedures on-site
What is the most common reinforcing material used in reinforced concrete?
Steel bars (RSB) or welded wire mesh
What is the term used to describe concrete that is cast on-site, as opposed to precast concrete?
Cast-in-place concrete
What is the most likely course of action if a sample from an actual concrete pour fails to meet the desired strength requirements?
The structure will be subjected to strengthening, rehabilitation, or retrofitting
What is the primary purpose of a soil investigation before deciding on a foundation system?
To evaluate if the soil can hold the building mass
How many soil borings are typically conducted for a 2-storey building?
2-3 bore holes
What is the purpose of a Property Survey?
To establish the extent and geometry of the property boundaries
Which of the following is NOT a consideration when selecting a foundation system?
The size of the building lot
What is the primary purpose of an Existing Condition Survey?
To survey all utilities, infrastructure, and natural conditions above and below grade
What is the significance of conducting a proper soil investigation before deciding on a foundation system?
To ensure the soil can support the building mass and prevent potential issues
What is the purpose of a Round Gate Hopper?
To distribute concrete easily and accurately
How are Concrete Pump Booms typically mounted?
On booms for long-distance placements
What is the main function of the Mobile Pump's choke?
To control the flow of concrete
What is the purpose of a Mini-Hopper in a concrete structure?
To distribute concrete easily and accurately
How does a Mobile Conveyor Belt function in relation to concrete?
It moves concrete from one place to another
What distinguishes an Extended Gate Laydown Hopper from other types of hoppers?
It is designed for low loading height and site discharge
What is the primary purpose of supplying water to concrete surfaces during curing?
To keep the concrete continuously moist
Which of the following is NOT a recommended method for supplying water to concrete surfaces during curing?
Submerging the concrete surface in water
What is the purpose of control joints (also known as contraction joints) in concrete slabs?
To provide a weak spot where the slab can crack when thermal stresses exceed the strength of the concrete
Which of the following methods is NOT mentioned for forming control joints in concrete slabs?
Applying a chemical sealant to create a weak spot
What is the purpose of curing cast-in-place concrete?
To allow the concrete to achieve the desired properties for its intended use
What is a recommended method for placing concrete during hot weather?
Use concrete admixtures such as retardants to delay initial set
What is a typical requirement before pouring concrete?
Obtain a pouring permit from the structural engineer
Which method of consolidation is recommended for concrete members with a depth greater than or equal to 4 inches?
Mechanical concrete vibrator
When using a mechanical vibrator for consolidation, how far should it penetrate into the layer below?
6 inches (150 mm)
What is a recommended practice for construction joints?
Their locations must be specified and approved by the engineer
What is a recommended practice for cooling forms and subgrade before placing concrete in hot weather?
Cool forms with water and moisten subgrade to a dewy state
Learn about the ASTM C39 standard test method for measuring the compressive strength of cylindrical concrete specimens and the ASTM C78 standard test method for determining the flexural strength of concrete. Understand the significance of these tests in assessing concrete strength for future use in design mixes.
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