CONCRETE BATCH PLANT OPERATOR EXAM
(FDOT)
If the batch weight equals 3,810 and the yield is 27 ft3 what is the unit weight? -
ANSWERS-141.1 lbs/ft3
What is the water-cementitious ration (w/cm) of a concrete mix that contains 550
lbs/yd3 of cement, 120 lbs/yd3 of fly ash and 35 gal/yd3 of water? - ANSWERS-
0.44
A batch of sand is 1,310 lbs. If a 1,050 gram sample from the batch weighs 966.4
grams when oven dried, weights do not include the pan. How many pounds of dry
sand are there? - ANSWERS-1206
What type of of cement is used in for all mass concrete elements? - ANSWERS-
Type II (MH)
What does the acronym OPC mean? - ANSWERS-Ordinary Portland Cement
What is Type I Cement? - ANSWERS-General use - everyday cement
What is type II Cement? - ANSWERS-Moderate soleplate resistance cement
, What is type III cement? - ANSWERS-high and early strength cement- grind finer
than type I and II, costs more energy and not as sustainable
What is Type IV cement used for? - ANSWERS-low heat application cements-
concrete damn or huge concrete column - not used anymore, fly ash or slag is
used now.
Type V - ANSWERS-High soleplate resistance cement.
What is white cement? - ANSWERS-Reacts similar to Portland cement but very
low amounts of iron - it is not actually white, it is slightly yellow- used for making
concrete with consistent coloring.
What are microfibers used for? - ANSWERS-To avoid plastic shrinkage in concrete
- holds concrete together while its wet.
What are Macrofibers used for? - ANSWERS-To maintain strength of the concrete
when the it hardens.
What is an air entraining admixture? - ANSWERS-Adds SOAP into the concrete
helps to split bubbles in concrete mixes. SOAPs are surfactants - containing a
hydrophilic head and hydrophobic tale which align themselves around the
bubbles in concrete- they attract cement grains- helps to hold the bubble in place
and form a shell material around the bubble to prevent air from exchanging
between the bubbles.
(FDOT)
If the batch weight equals 3,810 and the yield is 27 ft3 what is the unit weight? -
ANSWERS-141.1 lbs/ft3
What is the water-cementitious ration (w/cm) of a concrete mix that contains 550
lbs/yd3 of cement, 120 lbs/yd3 of fly ash and 35 gal/yd3 of water? - ANSWERS-
0.44
A batch of sand is 1,310 lbs. If a 1,050 gram sample from the batch weighs 966.4
grams when oven dried, weights do not include the pan. How many pounds of dry
sand are there? - ANSWERS-1206
What type of of cement is used in for all mass concrete elements? - ANSWERS-
Type II (MH)
What does the acronym OPC mean? - ANSWERS-Ordinary Portland Cement
What is Type I Cement? - ANSWERS-General use - everyday cement
What is type II Cement? - ANSWERS-Moderate soleplate resistance cement
, What is type III cement? - ANSWERS-high and early strength cement- grind finer
than type I and II, costs more energy and not as sustainable
What is Type IV cement used for? - ANSWERS-low heat application cements-
concrete damn or huge concrete column - not used anymore, fly ash or slag is
used now.
Type V - ANSWERS-High soleplate resistance cement.
What is white cement? - ANSWERS-Reacts similar to Portland cement but very
low amounts of iron - it is not actually white, it is slightly yellow- used for making
concrete with consistent coloring.
What are microfibers used for? - ANSWERS-To avoid plastic shrinkage in concrete
- holds concrete together while its wet.
What are Macrofibers used for? - ANSWERS-To maintain strength of the concrete
when the it hardens.
What is an air entraining admixture? - ANSWERS-Adds SOAP into the concrete
helps to split bubbles in concrete mixes. SOAPs are surfactants - containing a
hydrophilic head and hydrophobic tale which align themselves around the
bubbles in concrete- they attract cement grains- helps to hold the bubble in place
and form a shell material around the bubble to prevent air from exchanging
between the bubbles.
