Sustainable Building Systems Alternative Construction Materials

ovariesracialUrban and Civil

Nov 25, 2013 (3 years and 11 months ago)

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Administrative Information

ةيرادلاا تامولعملا


عورشملا ناونع
-


Project Title

SUSTAINABLE BUILDING SYSTEMS


ALTERNATIVE CONSTRUCTION
MATERIALS

LES SYSTEMES VIABLES DE BATIMENT


MATERIELS ALTERNATIFS DE
CONSTRUCTION

ةمادتسم تآشنم


يدب ةيئاشنإ داوم
ةل


لا
يسيئرلا ثحاب

Principal Investigator
-


مسلاا


乡浥

ةسسؤملا

I湳瑩瑵t楯i

ةيفيظولا

P潳o

ناونعلا

䅤摲e獳

ينورتكللاا ناونعلا

e
-
浡楬

فتاهلا مقر

呥汥灨潮l

䵯畮M爠
䵡扳潵b

䅭A物ra渠
啮楶U牳楴y映
Be楲畴

⡁啂⤠


C楶i氠l
䕮癩牯湭b湴慬n
䕮b楮ie物rg
䑥p
a牴浥湴

Professo
r of
Civil
Engineering

AUB, Bliss
Street,
Beirut,
Lebanon

mounir@aub.edu..lb

+961
-
1
-
350000 (ext
3460/4)


نوكراشملا نوثحابلا

Co
-
Workers
-


مسلاا


乡浥

ةسسؤملا

I湳瑩瑵t楯i

ينورتكللاا ناونعلا

e
-
浡楬

B楬a氠䡡浡m

䅕A

扨b浡摀a畢⹥摵⹬d

䡥汭椠䭨i瑩b

䅕A

桥〰0
a畢⹥摵⹬d


عورشملل ةيدقاعتلا ةدملا

Duration
-
:

㈠yea牳


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Scientific Information

ة
ّ
يملعلا تامولعملا

فدهلا
-


Objectives

The objective of this research
was

to identify new materials or create novel cement/concrete
mixes that encapsulate sustainable element
s while satisfying strength and improving
performance requirements such as durability and thermal properties.


ةققحملا تازاجنلاأ

Achievements
-

The output
is

considered to fit the criterion of sustainable building design since it is expected to:
when co
mpared to regular cement or concrete mixes, (i) improve physical characteristics and
structural performance thus requiring less material; (ii) reduce material and energy resources
depletion; (iii) provide a material with better thermal property and therefo
re increase energy
efficiency; (iv) contribute to sustainable living through improving livelihood conditions of rural
and farming communities by using agricultural or recycled waste products.


ثحبلا قافآ

Perspectives
-


Phase 1:

In the first phase, new sustainable concrete
wa
s produced using materials that are classified as
wastes or naturally produced materials such as agricultural crops. Hemp
was
incorporated in
trial concrete mixes using v
ariable aggregates proportions, in order to reach an optimal concrete
mix that encapsulates strength, performance, and thermal conductivity acceptance criteria. In
addition to hemp, banana tree leaves, palm tree leaves, and bamboo
we
re investigated in the

research. Several laboratory tests
we
re performed for the concrete physical properties.
Different volumetric ratios of added fibers
wer
e to be tried and tested.
The trial mixes included
68 beams (5 x 20 x 20 cm) and 66 cubes (7 cm), tested at 10 and 28

days for flexural and
compressive strengths, respectively.


Phase
2:

Adopting the optimal hemp
-
reinforced concrete mix of the first phase, the hemp volumetric
ratio was varied between 0.5%, 0.75%, and 1.0%; in addition to the coarse aggregate reduction
percent variation between 10%¸ 20%, and 30%.


T
he preliminary concrete mixes tests include
d

the compressive strength and the tensile strength.

Furthermore, other tests
we
re performed on
the new mixes, in order to confirm the performance and strength of th
e materials. These tests
encompass
ed

s
lump
t
est, density,
tensile splitting

t
est,
f
lexural
t
est,
c
ompression
t
est, and
m
odulus of
e
lasticity
t
est. Besides, the thermal transmission
property

was

investigated using a
block
t
est.

A

total of 180

standard

cy
linders

(15 x 30 cm)
, 72 beams

(15 x 15 x 54 cm)
, and 12

blocks (5 x 30 x 30 cm) were prepared
. The compressive strength was determined at 3, 7, and
28 days concrete age. The flexural strength was determined at 7 and 28 days. All other tests
were perfor
med at 28 days.

In addition to the control mix, two hemp mixes were adopted and st
ructural elements
we
re
prepared and tested. Structural elements include
d 18

simply supported beams

(20 x 30 x 200
cm)
. The main structural properties
were

checked
in terms
of the flexural,
shear
, and bond

strength. The effects of admixtures in the concrete mixes on the structural behavior
we
re
compared with regular control concrete mixes. Identical structural elements with new concrete
mixes versus structural elements with

regular control concrete mix
were cast and compared.

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تارمتؤملا يف تامهاسملاو تاروشنملا
-


Publications & Communications

DOCTORAL DISSERTATION


Awwad, E. (2011). “Sustainable Building Systems Alternative Construction Materials.” PhD
Thesis, Civil Engineer
ing, American University of Beirut.



PAPERS IN REFEREED JOURNALS


Awwad, E., Hamad, B., Mabsout, M., and Khatib, H. (2012). “Structural Behavior of Simply
Supported Beams Cast with Hemp
-
Reinforced Concrete.” Under review by the
American
Concrete Institute

(ACI) Materials Journal
.


Awwad, E., Mabsout, M., Hamad, B., Farran, M., and Khatib, H. (2012). “Studies on Fiber
-
Reinforced Concrete using Industrial Hemp Fibers.”
The Construction and Building Materials
Journal, Elsevier
, Vol. 35, October 2012, pp.710
-
717.


Awwad, E., Hamad, B., Mabsout, M., and Khatib, H. (2012). “Sustainable Concrete using
Hemp Fibers.”
Construction Materials Journal
,
Institution of Civil Engineers (ICE),
DOI:
10.1680/coma.11.00006.


Awwad, E., Mabsout, M., Hamad, B., and Khatib, H.

(2011). “Preliminary Studies on the Use
of Natural Fibers in Sustainable Concrete.”
Lebanese Science Journal, Lebanese Association
for the Advancement of Science (LAAS),
Vol.12, Issue No. 1, June 2011, pp 109
-
117.



PAPERS IN REFEREED CONFERENCES PROCEEDI
NGS


Awwad, E., Hamad, B., Mabsout, M., and Khatib, H., “Sustainable Construction Material Using
Hemp Fibers


Preliminary Study.”
Proceedings of the 2nd International Conference on
Sustainable Construction Materials and Technologies
, Università Politecnic
a delle Marche,
Ancona, Italy, June 28
-
30, 2010.


Awwad, E., Mabsout, M., Hamad, B., and Khatib, H., “Preliminary Studies on the Use of
Natural Fibers in Sustainable Concrete.”
Proceedings of the 16th Science Meeting, Lebanese
Nati
onal Council for Scientific Research (LNCSR) and the Lebanese Association for the
Advancement of Science (LAAS),
Beirut Arab University, Lebanon, Nov. 13
-
15, 2009.


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ثحبلا جئاتن نع زجوم

Abstract
-


The
research

reports on tests performed on sustainable
‘‘green’’ concrete using industrial hemp
fibers. The

incorporation of hemp in concrete would save on natural resources. The demand for
hemp would be a

major incentive to farmers to benefit from the social impact. In the
experimental program, tests’ results

on standard specimens for flexure, compression, splitting
tensile, modulus of elasticity, thermal conductivity,

de
nsity, and slump are presented. In
addition to the control mix, two hemp mixes were adopted and st
ructural elements
were
prepared and tested
.

Th e ma i n s t r u c t u r a l p r o p e r t i e s
we r e

c h e c k e d
i n t e r ms o f t h e f l e x u r a l,
s h e a r
, a n d b o n d

s t r e n g t h.
Re s u l t s i n d i c a t e t h a t t h e u s e o f i n d u s t r i a l h e mp f i b e r s l e d t o a

r e d u c t i o n i n c o a r s e a g g r e g a t e q u a n t i t y wi t h o u t a f f e c t i n g t h e f l e x u r a l p e r f o r ma n c e o f c o n c r e t
e, i n
a d d i t i o n

t o a s i g n i f i c a n t e n h a n c e me n t i n d u c t i l i t y o f l o a d

d e f l e c t i o n b e h a v i o r.

Th e f i n a l o u t c o me wa s a n o p t i ma l h e mp
-
r e i n f o r c e d c o n c r e t e mi x. Ot h e r a g r i c u l t u r a l f i b e r s
we r e e x c l u d e d f r o m t h e r e s e a r c h b e c a u s e o f t h e i r we a k e n e d p e r f o r ma n c e c o mp a r e d t
o t h e h e mp
f i b e r s i n c o n c r e t e, a n d d u e t o t h e l i mi t e d a v a i l a b i l i t y o f n e e d e d l a r g e r q u a n t i t i e s.

O
nce hemp
crops are found to be sati sfactory in concret e mi xes, the local harvesti ng of hemp is
recommended. Hemp would be an advantageous subst it ute to it s s
ist er il legal drug plant. The
demand for the hemp fi bers for concrete producti on would be a major incenti ve to Lebanese
farmers to grow this plant and benefit from t he social impact on t he habit at level of living.