In this work composite hybrid materials were prepared from a base
material composed of epoxy and phenol - form aldehyde resins and
reinforced by 30% wt alumina and silica powders and asbestos
fibers. For samples were prepared with. Different ratio of
reinforcing material.
This research carries how to do steel pipelines defects repair process by a simple and
easy way. At first the region that surrounds the defect is cleaned then the epoxy material is
put over the defect after mixing the resin with the hardener well.
Epoxy layer dimensions
depend on the defect dimensions that exists in the pipe. After that, the specimen is released
for a period of time to obtain the setting process. Several types of epoxy were used for
preparing series of specimens, which were tested on the pressure set up to estimate the
efficiency of this way in the repair, and knowing the pressure values that epoxy layer can
carry. A pipe of three holes their radius are equal, was treated by using ALTECO QUICK
EPOXY STEEL and the pressure gauge recorded many values that reached 18 bar. The
curve, that represents the relationship between the pressure which the epoxy layer carried
and its surface area, was drawn. It is found that the most effect factor in the repair process
is the specimen preparing and the thickness of the epoxy layer.
This research aims to study the efficiency of flexural strengthening of RC beams with different lengths of CFRP strips by using (NSM) technique. The study is carried out experimentally on (14) concrete beams; the variables considered are (the length
and number of CFRP strips). This is established by dividing the work into two groups: the first one includes (6) beams strengthened by variable carbon fiber strip lengths and one strip, The second group includes (6) beams strengthened by variable carbon fiber strip lengths and two strips, as well as two control beams. The results indicate that carbon fibers have a noticeable effect on increasing the bearing capacity of (NSM) strengthened beams. The results also show that strengthening the beams by CFRP and not along the length of the beam and in one layer does not contribute to increasing beam strength, but when the number of layers increases, an increase in beam strength is noticed at a rate range (40%-72%).
In this research project, the EPON 828 /Hardener 2512 epoxy resin coating
has been prepared at the ambient laboratory temperature with different epoxy/
hardener ratio.
In this research work, an epoxy polymer- Carbon Black composite has been
prepared and characterized regarding the effects of adding carbon black to
epoxy polymer on some structural properties such as polymerization behavior,
cross-linking reaction
time and yield and some properties e. g. glass transition
temperature (Tg), Young modulus (E) and flexural strength (σ).
The cross-linking reaction and glass transition temperature were studied by
Differential Scanning Calorimetry (DSC), and the mechanical tests were done
by Universal Testing Machine.
