SBM321 Summary Notes

SBM 321
TB :
construction mut .
5th ed.
① BUY !!


Stress strain behavior : 100x100x100mm =
I l

Load
X rate
dependent
x
Static/permanent
Impact/dynamic
X




Cyclic

Testing short specimen
: to test mat
- strength
Pl 2x0 = h NOT structural/shape strength .




F

CREEP :


1 ·




↓ viscoelastic
E


M -




elastic-i
,

Under sustained load
① fracture
-




- State rapidly.




-
inc



I




I




Primary" Secondar
,
"


Mean strength US Characteristic
.



Strength




L
tress
near
↳ mean
average strength


~
-




,
4
&
-
-
oa




11
pat
failure
.

,
,
, Chapter 13


Cement Properties ?
Why added
gypsum
Portland Cement :
calcium silicates 3% added to protect CA
calcium
oxide
silica/ silicon gypsum
dioxide "extends reaction"
* consists of CaO and SiOz

* made from limestone/chalk (cacos) and Clay (silica
*
Contains other oxides such as Al , Fe , Na ,
K




Hydrated (HCP)
Cement Paste
Calcium Silica hydr ? /CSH)

=




-

① limestone or PHYSICAL PROPERTIES :
chalk

are blended
and clay
Cheati1400-1308
ng Portland
Gs
cements are fire
grey powders
=
3 .
14 Size :
2-80 nm


coal/oil/gas
rotates material / to inc rate of
② form
minerals heating
here


③
granular material
comes out

d
mixed with gypsum
↳ make cement
grind up to




CHEMICAL PROPERTIES :
lower kiln efficiency
-
get more [S



A lite (fast hardening cement)
KNOW !
->
-> Belite (slow
hardening cement)




These compounds start to form & diff temps clinker heats in kiln
as
up
Belite (C2S)
3
starts to form
a 700
-




& 1450° most of belife -> alite
,
Alite ((35) 11
1300°C
-




&

CsA and CAF forme 900°C
-




↓
Bogue numbers/equations :
to calculate compound composition

↓

wen
-

from e


SOz




add up 100 % But these the
are


working parts of concrete
.