Contribution
to Research
I have been actively engaged in two research areas,
namely Glass Fiber Reinforced Plastic (GFRP) bars and concrete durability.
I have conducted several studies on GFRP bars. This topic was of special interest to me as
my Ph.D. dissertation work was also related to this subject. Since corrosion of reinforcing steel and the
resulting reduction in the design-life of structures in the
Field
exposure and testing was also initiated to
obtain information on the long time performance of GFRP reinforcing steel bars
under the local exposure conditions. The
ultimate objective is to identify areas of application of GFRP reinforcement in
the local environment. In this study,
pull-out and beam concrete specimens with GFRP bars were cast and exposed to
the tidal zone, below ground zone, and above ground zone in Khaleej
Mardomah field station. The specimens would be retrieved after
predetermined periods of exposure and bond strength, and tensile strength of
retrieved GFRP bars would be evaluated. Moreover,
all the exposed specimens will be monitored visually for any sign of damage or
deterioration throughout the duration of the study. The microstructural
changes of limited number of retrieved GFRP bars will be examined using
scanning electron microscopy (SEM).
The findings of the
laboratory work as well as the ongoing field investigations in this area will
be of great interest to the researchers since they address unique exposure
conditions such as sabkha. The results of laboratory studies on GFRP
bars have already been used in formulating the Guide for Design and
Construction of Concrete Reinforced with FRP Bars by ACI Committee 440.
My second area of research activity has been in the
area of concrete durability. Since the
environmental conditions of the
I
was the Task Leader of a study through which a field exposure study was
established five years ago along the shoreline of
I
was also involved in studies that were conducted to inhibit reinforcing steel corrosion under atmospheric
condition, effect of dust in
aggregates and the chloride concentration in soil on concrete durability, effectiveness of concrete patch repairs
using formed and non-formed cementitious repair
materials, effect of rebar cleanliness
on the effectiveness of repairs, comparative study of the performance of
water quenched steel bars with air-cooled bars, and specification for silica
fume to produce durable concrete.
I
was the Project Manager of a study on the usefulness of corrosion inhibitors in
inhibiting corrosion of fusion bonded epoxy coated bars with holidays and
surface damage. I was the principal
investigator of two studies funded by KFUPM.
These included: protection
through chemical inhibitors in reinforced concrete structures with fusion
bonded epoxy coated bars, and protection through chemical inhibitors in blended
cement concrete structures reinforced with surface damaged FBEC bars.
My research activities in concrete durability have
been concentrated on the following topics:
·
Plastic
shrinkage cracking of concrete under hot weather conditions
·
Structural
performance of concrete structures with corroded reinforcement
·
Effectiveness
of penetrating sealers in preventing concrete deterioration
·
Cathodic protection under hot weather conditions
·
Performance
evaluation of concrete surface coatings
·
Protection
of concrete utilizing corrosion inhibitors
·
Durability
of high performance concrete
·
Effect
of sulfate concentration and ionic concentration on the performance of plain
and blended cements
In
general, the data developed in the completed and ongoing projects are very
useful to the clients and the local construction industry. The clients have updated their
specifications. In some cases, the
outcome of the projects has helped the clients in their marketing
activities. Since the projects relate to
assessing the performance of conventional and advanced materials under local
conditions, the outcome is highly applicable to the local construction
industries. This information could also
be adopted in other hot and semi-arid regions.
I was a member of M.S. theses committees in the
Department of Civil Engineering at KFUPM.