Mechanical and physical properties of fly ash foamed concrete
Foamed concrete has become most commercial material in construction industry. Fly ash is receiving more attention now since their uses generally improve the properties of blended cement concrete, cost saving and reduction of negative environmental affects. The physical and mechanical properties o...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2011
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/2665/1/24p%20KHALID.%20ALI.%20%20M.%20GELIM.pdf http://eprints.uthm.edu.my/2665/2/KHALID.%20ALI.%20M.%20GELIM%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/2665/3/KHALID.%20ALI.%20M.%20GELIM%20WATERMARK.pdf |
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| Summary: | Foamed concrete has become most commercial material in construction industry. Fly
ash is receiving more attention now since their uses generally improve the properties
of blended cement concrete, cost saving and reduction of negative environmental
affects. The physical and mechanical properties of foamed concrete differ according
to a different type of mixture and its composition. Therefore, this research
investigates physical and mechanical properties of fly ash foamed concrete. Fly ash
was used as fine aggregate. Six series of fly ash foamed concrete for target densities
(1000, 1100,1200,1300,1400 and 1500 kg/m
) with constant cement to fly ash ratio
(1:1.5) and cement to water ratio (1:0.65) by weight were prepared and tested. Tests
were conducted to study physical properties (work ability, water absorption, drying
shrinkage and carbonation) and mechanical strengths properties (compressive,
splitting tensile and flexural strengths). Three types of specimens (cube, cylinder and
prism) were used in different quantity and different purposes. The specimens of
drying shrinkage test were opened after one day but, others specimens were demoulded
after
three
days
and
subjected
to air
curing
under
room
temperature.
As
result,
the findings
from
this
project
are
very
encouraging
towards
the
use
of
fly
ash
foamed
concrete
density
of
1100 and
1200 kg/m
3
in block application due to its
compressive strength (3.7 – 6.7 MPa) whereas density of 1300, 1400 and 1500 kg/m
3
3
in structural application due to its high compressive strength (10 – 18.8 MPa) and
moderate water absorption that was below 10%. It was also found that the physical
properties of fly ash foamed concrete are high drying shrinkage between -666 to 1022
micro
strain,
high
water
absorption
for
density
less than 1300
kg/m
, higher
workability (115 -180 mm diameter) and high carbonation depth that make it a good
breathable material that removes carbon dioxide from our environment. Lastly
comparative analyses were done to determine the relationships between the various
mechanical properties parameters of the fly ash foamed concrete, namely the
compressive strength, flexural strength, splitting tensile strength and mathematical
equations were derived. |
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