Engineering :: Concrete Technology

@ : Home > Civil Engineering > Concrete Technology

121.

The apparent specific gravity of an aggregate is defined as

A.	the weight of oven dry aggregate divided by its absolute volume, excluding the natural pores in the aggregate particles	B.	the weight of oven dry aggregate divided by its absolute volume, including the natural pores in the aggregate particles
C.	the weight of aggregate required to fill a container of unit volume	D.	the difference in weight of the aggregate in saturated surface dry condition and in moist condition

122.

The bulk density of an aggregate is the weight required to fill a container of unit volume.

Agree

Disagree

123.

The value of bulk density for angular and flaky aggregates is

A.	same	B.	less
C.	more

124.

The value of bulk density of the aggregate depends upon

A.	size distribution of aggregate	B.	shape of aggregate
C.	specific gravity of aggregate	D.	all of these

125.

An aggregate which may contain some moisture in the pores but having dry surface is known as

A.	very dry aggregate	B.	dry aggregate
C.	saturated surface dry aggregate	D.	moist aggregate

126.

An aggregate having all the pores filled with water but having dry surface is called

A.	very dry aggregate	B.	dry aggregate
C.	saturated surface dry aggregate	D.	moist aggregate

127.

A moist aggregate is one

A.	whose all the pores are filled with water and also having its surface wet	B.	whose all the pores are filled with water but having its surface dry
C.	which do not contain any moisture either in the pores or on the surface	D.	which may contain some moisture in the pores but having dry surface

128.

The surface moisture of aggregates increases the water-cement ratio in the mix and thus

increases

decreases

129.

Which of the following statement is correct?

A.	Larger the size of coarse aggregate, lesser is the quantity of fine aggregate and of cement required.	B.	If very dry aggregates are used, the workability of the mix is likely to be reduced
C.	Bulking is caused due to the formation of thin film of surface moisture around the sand particles.	D.	all of the above

130.

The deleterious materials present in the aggregate

A.	prevent normal hydration of cement	B.	reduce the strength and durability of concrete
C.	modify the setting action and cause efflorescence	D.	all of the above