Masonry/concrete Flashcards
What are the different types of cement?
1 normal 28, 2 modified 45, 3 high early 7, 4 low heat 90, sulfate resistant 60 days
What are the 4 types of concrete?
Reinforced, precast, prestressed, lightweight.
What are the disadvantages of concrete?
Low tensil strength, expands and contracts, shrinks when dry, heavy
What is the 3/2 rules?
L x w x h x how many pads, x = pv
Pv 5400 x 1.05 = Lf, lf x lv 1.5 = ^number desired, bags 1x#\6=
2x#\6 = sand 3x#\6= gravel
8 x # of bags = gallons of water
What is the hand mixing sequence?
3 parts gravel 2 parts sand 1 part cement
What is the optimal temp for concrete to dry?
73
What is the most commonly used cement in the military?
Portland
What are the 4 types of mortar?
M,s,o,n
What are the desirable properties of mortar?
Plasticity, water retentivity, strength and durability
What are the three types of squaring?
345/6810, carpenters square, diagonal method
What must cement forms be?
Tight rigid and strong
How deep must you moisten the sub grade?
6 inches
What are the different types of concrete joints?
Control, construction, contraction, isolation, expansion
What is the formula for estimating number of block, cement, sand, and water for a job?
Block linear feet x height x 1.125= # , # of block/100x3 = bags 1 ton of sand per every 8 bags 8 gallons of water per bag
What is the formula for estimating number of block, cement, sand, and water for a job?
Block linear feet x height x 1.125= # , # of block/100x3 = bags 1 ton of sand per every 8 bags 8 gallons of water per bag
