concrete, brick, plaster - book sec 16 Flashcards
Why shall formwork for all slabs be set with a camber of 1/4 inch for each 10’ of span?
underside of the finished slab to be level.
camber - slightly convex or arched shape of a horizontal surface
cinder concrete is useful because
lightweight
cinder concrete
Cinder concrete slab construction, also known as cinder arches, “goulash” construction, or even “short span arch construction”, was a type of reinforced concrete slab system consisting of low strength concrete which used cinders as an economic substitute for stone aggregate and draped wire mesh as reinforcement.
(Structuremag.org)
portland-cement concrete in which clean well-burned coal cinders are used as coarse aggregate.
(merriam-webster.com)
the purpose of the crimp in a tie bar in a cavity wall is
prevent water from passing across the bar
SAND-LIME BRICKS
Sand-lime bricks are made out of sand, lime and water (no additives). By high pressing the mixture and autoclaving afterwards a firm white building material is produced. Good acoustic insulation, good heat & humidity accumulation as well as excellent fire resistance are the main parameters for architects to prescribe lime sand bricks for each building project.
Sand-lime brick is a precast building material that simultaneously provides structure, thermal insulation and sound insulation.
carmeuse-construction.com
cored brick - what is the minimum thickness between the core and the face of the brick
3/4”
1 gross
144
1 board foot
Timber cubic volume of 12”x 12” x 1”
To calculate,
T” x W” x L’ / 12
Or
T” x W” x L” / 144
cause of map cracking in the finish coat plaster
is a weak brown coat
lowest temp for plastering
50 F
Plaster of Paris
gaging plaster that is used to accelerate the setting time of finish coat plaster
Bond plaster
scratch coat, generally required to be mixed neat without the addition of sand
min temp for laying asphalt tile
70 F
turpentine
common paint thinner
splices in the steel columns of a tall steel frame building are usually located at
2’ above the floor
most important advantage in the use of steel shell piles is
the opportunity for better inspection
Engineering News Record formula for piles
P = 2Wh / s + c
W = weight of the hammer
h = height of fall of the hammer
S = average penetration of the last 5 blows in inches
C = a constant (1” drop hammer, 0.1” steam hammer)
Brickwork usually require special precautions and protection for work in cold weather - highest temperature below which are required?
40 F
Brickwork - Efflorescence may be removed by washing with
Muriatic acid
Construction joints in the concrete columns of a multistory building are usually located at
floor level
rowlock course of bricks are laid
on their 2 1/4” x 8” surface
lime to a mortar mix will increase
workability
per M
per 1000
how many pound of 16d nails are req’d for 1,000 SF of floor framing area
7-8 pounds
