effect of glass powder on the mechanical properties of mortar

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29 Νοε 2013 (πριν από 3 χρόνια και 6 μήνες)

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AL
-
Najah National University

Faculty Of Engineering

EFFECT OF GLASS POWDER ON
THE MECHANICAL PROPERTIES OF
MORTAR

Designed by :

Sameh

Zabadi


Taher

Sameer

Shaker
Alhanbly


EFFECT OF GLASS
POWDER ON THE
MECHANICAL PROPERTIES
OF MORTAR

What is Concrete ?

Concrete

: is a
composite

construction material
composed of
cement

(commonly
Portland cement
)
and other
cementitious

materials such as
fly ash

and
slag cement
,
aggregate

(generally a coarse
aggregate made of gravels or crushed rocks such
as
limestone
, or
granite
, plus a fine aggregate such
as
sand
),
water
, and
chemical

admixtures.

The word concrete comes from the Latin word
"
concretus
" (meaning compact or condensed), the
perfect passive participle of "
concresco
", from
"com
-
" (together) and "
cresco
" (to grow).

Materials


Cement



Water



Aggregates




Glass
powder



Additives



Chemical
Admixtures

The Objectives


The objective of this study is to show:

1
-

the effect of adding Glass Powder to
concrete to improve the properties of
concrete.

2
-

The effect of adding Glass Powder as an
admixture on the durability and the
thermal insulation .

3
-

The benefits of addition Glass Powder
is to minimize the risk of the
Environmental Pollution.

Literature Review


In
2009
, Engineer
Imad

Qasim

doing a study on
the impact of glass powder on concrete and he was
made some tests ; These tests include compressive
strength, flexural strength, and flow table test
(workability test).



Twenty kilograms of glass powder was used as a
partial replacement for cement and sand (silica and
limestone) by
0
%,
10
%,
15
%, and
20
%. Seven
mortar mixtures were tested at room temperature,
four mixtures were cured by water and three
mixtures were cured by high pressure steam curing
(autoclaving).

Methodology

We will crash
fourty

five kilograms of waste
flat glass and prepare it as powder to be used
as
cementitous

or filler materials in mortar
mixes.

In Those mixtures waste glass powder we
used them as replacement of cement or sand
at percentage
0
% ,
5
% ,
10
% ,
15
% , in order
to show the effect of waste glass powder on
the mechanical properties of mortar and the
thermal insulation .



Composition

There are many
types of concrete

available, created by
varying the proportions of the main ingredients below. By
varying the proportions of materials, or by substitution for
the
cemetitious

and aggregate phases, the finished product
can be tailored to its application with varying strength,
density, or chemical and thermal resistance properties.


The
mix design

depends on the type of structure being built,
how the concrete will be mixed and delivered, and how it
will be placed to form this structure.

Concrete is strong in
compression
, as
the aggregate efficiently carries the
compression load. However, it is weak in
tension as the cement holding the
aggregate in place can crack, allowing
the structure to fail.
Reinforced concrete

solves these problems by adding either
steel reinforcing bars
, steel fibers, glass
fiber, or plastic fiber to carry
tensile
loads
.

Reinforcement



experimental Work

( Tests on concrete )

Workability


Workability is the ability of a fresh (plastic) concrete mix to fill
the form/mold properly with the desired work (vibration) and
without reducing the concrete's quality. Workability depends
on water content,
aggregate

(shape and size distribution),
cementitious

content and age (level of
hydration
), and can
be modified by adding chemical admixtures, like
superplasticizer
. Raising the water content or adding
chemical admixtures will increase concrete workability.
Excessive water will lead to increased bleeding (
surface
water
) and/or segregation of aggregates (when the cement
and aggregates start to separate), with the resulting concrete
having reduced quality.

Workability


Different tests have been developed on
workability :

1
-
Slump test .

2
-
Flow test .

3
-
Subjective assessment .

4
-
Penetration test .

5
-
Mixer test .

6
-
Remolding test .

7
-
Compaction test .

Compressive strength result

Replacment

by cement



Mix NO.

Strength (
Mpa
)

with
Curing time

(
7
days)


Strength (
Mpa
) with
Curing time (
28
days).


1
)

0
%

16

23

15.5

23

16

23

2
)
5
%


14.5

22

15

22

15

22

3
)
10
%

14

20

14

20.5

14

19.5

4
)
15
%

13

18.5

12.5

19

12.5

19

Replacment

by cement

in
7
days

In
28
days

Compressive strength result

Replacment

by limestone sand


Mix NO.

Strength (
Mpa
)

with
Curing time

(
7
days)



Strength (
Mpa
) with
Curing time (
28
days).



1
)

0
%

16

23

15.5

23

16

23

2
)
5
%


19

25

18

25

18.5

25

3
)
10
%

19

26

19

25.5

19

26

4
)
15
%

19

25

18.5

25

19

24.5

Replacement by limestone sand

In
7
days

In
28
days

Comparing in days

In
7
days

In
28
days

We obtained significant results
for this test ( compressive
strength test ), because the
results resemble the results
very closely that Eng :
Imad

Al
-
Qasem

found in and support
his M.Sc. Thesis .


Heat Flow Test

Depends on heat transfer with time .


basically the apparatus consists of tow plates with
dimensions of (
54
*
54
) cm, one is upper the other
other

is
below, knowing that the upper is flexible , and we can
move it, as needed.


Procedure :


-

heating the upper plate to constant temperature .


-

Putting any material between plates .


-

the heat well transfer through the material to the lower
plate .


-

the apparatus well calculate the heat transfer rate, and
given the value of conductivity of the material.





With
15
% Replacement by
limestone


Without WGP

Heat Flow Test Results



Thermal
risistance


K/W

HFT

Thermal

conductivity

W/
m.k

Without

WGP

0.06804

126.0403

0.4749

15 %
Limestone
Rep

0..06648

119.864

0.46607

15%
Cement
Rep

error

error

Error

The results show that there is not a
significant effect measured when the glass
powder is replaced with either cement or
limestone. There is not a significant
difference. The results are very close to
each other and resemble each other; the
obtained results do not differ significantly.


The error on third one happen because we
have voids in it and it wasn’t made right.


Abrasion test



The last test that was supposed to be
conducted to complete this research is
the abrasion
-
test. Unfortunately, the
needed materials to conduct the
experiment were not available at the
time of the research, neither at the An
-
Najah

university or in the field. The
results will therefore not be provided in
this paper.










Abrasion test

Abrasion test stand

Disk & wear plates

Measuring thickness


Summary and
Conclution

Waste glass powder is a new supplementary material that can
be used in mortar mixtures. In this conducted study, more than
48
mixes of mortar were prepared by using waste glass powder
as a replacement for cement or for limestone. Mechanical
properties were tested. The mechanical properties include
compressive strength.


As described in the result section and the abstract, the results
show us that when the limestone is replaced by waste glass
powder, the compressive strength will increase because it is a
filler. Because the limestone contains a lot of voids, the glass
powder serves as a filler material. On the contrary, when
replacing glass powder with cement, the compressive strength
will decrease. Cement is the main material for the strength of
mortar or concrete.


Summary and
Conclution

Another experiment conducted in this study is the heat flow
test. The results show that there is no significant effect
measured when the glass powder is replaced with either
cement or limestone. The results are very close to each other
and resemble each other; the obtained results do not differ
significantly.


Waste glass powder is a relatively new supplementary
cementing material that can be used in the mortar mixtures. It
plays a significant role to improve the fresh properties,
mechanical properties and durability of mortar.


If we use the waste glass powder as a replacement for
limestone, the compressive strength of mortar increases
significantly. In addition, the maximum compressive strength of
mortar can be achieved when using
10
% and
15
% of waste
glass powder instead of limestone.


Recommendations

There are several recommendations that can be made for future
research in this aspect. The usage of the WGP instead of
limestone is an interesting possibility because of the strength
.Until now though, there has not been found a way to use it
instead of cement, since cement is a major component and
material for compressive strength.. Further research in the use
of WGP is needed in order to generate the full potential of the
waste glass powder.



Other recommendations for this research include:

-

Conduct experiments on durability and Permeability

-

After we increase the percentage into more than
15
%, what
would happen to the compressive strength?

-

Check if the percentage in strength is good enough to make the
change or what?


Refrences


www.cementlab.com/cement
-
art.htm

http://www.ce.berkeley.edu/~paulmont/
165
/cement.p
df

United Nations Environment
Programme

(UNEP);
2002
.

An
-
najah

national university labs .
5
.

ASTM C
31
, C
39
, C
617
, C
1077
, C
1231
, Annual
Book of ASTM Standards,


Volume
04.02
, ASTM, West Conshohocken, PA .

M.Sc. Thesis ( Al
-
Qasem

;
2009
)