الفهرس 
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Abstract
Durability is one of the main properties of concrete, which is
highly required especially for structures exposed to aggressive
environments. Current practice assesses the quality of concrete based
primarily on strength. It has been suggested that the quality of concrete
should be characterized not only by strength but also by its durability
characteristics. As water is generally involved in every form of
durability problems due to deterioration, concrete sorption and its
ability to permeate water usually determine the rate of deterioration.
While permeability is governed mainly by continuous voids inside the
concrete matrix, sorption is characterized primarily by its capillary
suction. It is particularly sensitive to the micro-structural properties of
the near-surface zone of concrete and therefore reflects the nature and
effectiveness of curing in addition to density of the concrete matrix.
The current study is earned out to investigate the relation between
sorption, compressive strength and durability of concrete in the
presence/absence of silica fume under four different curing regimes.
Effect of cement content was also studied at two different levels; 350
and 450kg/m3. The concrete sorption was measured by determining its
sorptivity coefficient as specified by ASTM C 1585. The test was also
performed on sample at the age of 7 years to fmd out the effect of
concrete aging on sorptivity.
III
ABSTRACT
ABSTRACT
Durability is one of the main properties of concrete, which is
highly required especially for structures exposed to aggressive
environments. Current practice assesses the quality of concrete based
primarily on strength. It has been suggested that the quality of concrete
should be characterized not only by strength but also by its durability
characteristics. As water is generally involved in every form of
durability problems due to deterioration, concrete sorption and its
ability to permeate water usually determine the rate of deterioration.
While permeability is governed mainly by continuous voids inside the
concrete matrix, sorption is characterized primarily by its capillary
suction. It is particularly sensitive to the micro-structural properties of
the near-surface zone of concrete and therefore reflects the nature and
effectiveness of curing in addition to density of the concrete matrix.
The current study is carried out to investigate the relation between
sorption, compressive strength and durability of concrete in the
presence/absence of silica fume under four different curing regimes.
Effect of cement content was also studied at two different levels; 350
and 450kg/m3. The concrete sorption was measured by determining its
sorptivity coefficient as specified by ASTM C 1585. The test was also
performed on sample at the age of 7 years to fmd out the effect of
concrete aging on sorptivity.