G-4 slab on grade Flashcards
on which kind of surface should a slab on grade be placed
suitable bearing ground or compact fill
what factors affect the durability of slabs on grade
water cement ratio , admixtures , treatment protections from weather
what factors affect the strength of slabs on grade
base materials. concrete mix , curing
what should be done to walls or columns that pass through or beside slabs on grades
isolation joints
why is it important to compact the subgrade
gives strength and proper bearing
why are screeds and forms oiled before concrete placement
to be easily stripped and cleaned
how long should slab forms remain in place after concrete placement
as long as possible
what does a give and take strip allow for
expansion , contraction and movement
what is the minimum slope for drainage for an exterior slab exposed to weather
1/8 per foot
what is the difference between a flat plate slab and a flat slab
flat plate is plain
flat slab will either have column capitals or drop panels
what advantages to column capitals give
allows for increased spans added shear strength
what direction does load carrying steel span
perpendicular to beams
dome pans are used in which type of slab
two way (waffle)
how does a two way joist system differ from a single joist system
2 way runs two ways and 1 way runs 1 way
in what sequence does form stripping usually take place
sides of beams - slab soffit
how are wooden t shores set to elevation
wedged
how are forms for drop panels supported
shores, stringers , joists
what is the slenderness ratio
1:50 of min thickness of post - un supported height
describe 3 ways single shores are made adjustable
screw jacks
wedges
eli clamps
why are re shores not fitted tightly to the concrete that they are supporting
so they wont place any undue pressures on the concrete while re shoring
describe a slab table
truss shoring , stringers , joists , plywood , screw jacks
what are flying forms
lifted by crane
how are aluma beams attached to the false work
slatted bottom , bolt
what is a mudsill used for
disperse weight
