The aim of this study is improving the durability of precast products of Glass Fiber
Reinforced Concrete (GRC) and in the context of sustainability applications, reduction of
cement consumption and replacement of it with green materials. This study
has been done
to test the role of the natural pozzolan from Shihan Hill in As Suwayda as supplementary
cementing material by 10% -15% -20% - 25%, and to determine the effect of it on the
consistency and flexure strength over 180 days, as well as to test its role in improving the
micro-structure of the mixture by reducing the content of Ca(OH)2 and increasing C-S-H
& C-A-S-H gel, which were tested using X-Ray Diffraction (XRD) and Energy Dispersive
X-Ray (EDX) techniques, and as a result reduced the erosion of fibers as shown in images
by Scanning Electronic Electron Microscopy (SEM). Moreover the role of pozzolana has
been studied in controlling the degradation of the material over time which tested by
immersion in hot water 50° for 150 days and by drying – wetting cycles. Also the effect of
pozzolana on absorption, porosity and resistance of sulfates attacks was studied. The
results have shown that the used natural pozzolana has no negative effect on consistency or
mechanical properties, and it improved all the studied durability factors.
The aim of this research to study the Abrasion on carbonate rocks which comes from specific mines in Syria, and possibility finding correlation between Abrasion test(L.A) and some physical properties of carbonate rocks .
Results or Finding:
- Most
of studied carbonate rocks are resistance(18-41%).
- There is correlations between some physical properties of carbonate rocks and Abrasion test(L.A) .
Mixtures of ammonium acetate and ammonium tartrate in the presence of
benzyl alkyl dimethyl ammonium chloride (benzalkonium chloride) were used
for sealing sulphuric acid anodized aluminium.
Mixtures of ammonium acetate and ammonium tartrate exhib
ited
synergistic sealing effect, which offered excellent durable corrosion protection
to the surface coating formed by anodizing the aluminium alloy. Moreover the
synergistic effect of benzalkonium chloride with tartrate offered boehmite free
sealed surface coating.
Quality and durability of the sealed aluminium oxide films have been
assessed using standard control sealing quality tests and well-known
salt- spray (fog) test (ASTM B 117-97).
Influence of light represented by ultraviolet radiation having two
different wavelengths, ٢٥٤ nm and ٤٠٠ nm, on some Iraqi cellulose extracted
from reeds as a raw material has been studied. It was found that the natural
degree of polymerization of
cellulose fibers was affected by UV radiation. This
was estimated by measuring the relative viscosity of cellulose solution and
compared to that of cellulose fibers before treatment. This is also true for the
effect of heat on cellulose fibers especially in the presence of oxygen due to the
oxidation process.
These results were compared with the results obtained for imported
cellulose, which was showed that it contains high percent of water vapor,
whereas the unbleached cellulose had the higher percent of volatile materials.
This reflects the relation between the type of cellulose and it’s sources.
