NEW
Font size
WorksheetsFresh Concrete
Total questions: 10
Worksheet time: 5mins
The type of aggregates is consider to be Course Aggregates if the size is:
more than 10 mm
more than 20 mm
less than 10 mm
less than 20 mm
The following are the important characteristics of aggregates for concrete EXCEPT:
size
weight
surface texture
cost
Which is the function of admixture?
To reduce the cost of concrete construction
To modify that properties of hardened concrete.
To ensure the quality of concrete during mixing, transporting, placing and curing.
All of the answers are correct.
"used to reduce the required water content of concrete mixture about 5-10%" - This admixture is referring to:
Air-entraining
Water-reducing
Retarding
Accelerating
If we want to slow down the setting time of concrete, we should add_____ :
Accelerating admixture
Retarding admixture
Super - plasticizers
Air-entraining
"________ is the process where the concrete starts to harden before it gains strength".
Setting time
Workability
Bleeding & segregation
Hydration
Bleeding of concrete is:
The separation of the constituent materials of concrete.
Water from the concrete comes out to the surface of the concrete, being of the lowest specific gravity among all the ingredients of concrete.
If the concrete get fully hydrated and low porosity are produced, it means the concrete will get:
low strength
high strength
The development of tiny air bubbles inside the concrete will cause concrete surface easy to cracks and the its possible to decay.
True
False
The water temperature has to be in room temperature and maximum temperature allowed is 100˚C.
True
False
