الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 273 |  |  |
| | | from | 273 | | |
Abstract
Title of Thesis:
Effect of Dunaliella Salina Algae from Qaroun Lake on the Behavior of
Reinforced Concrete.
Key Words:
Microbial concrete; compressive strength; tensile strength; flexural
strength; corrosion rate; self-healing efficiency; CaCO 3 ; SEM; EDX.
Summary:
This thesis presents experimentally; the role of two species of
bacteria and one of alga on the mechanical, permeation, and durability
of concrete (Grade 30). The different properties of concrete are tested
under fresh- and lake-water conditions. The microorganisms are added
directly, where the bacterial cells substitute a portion of the mixing
water, while the alga cells of the cement. The outcomes pointed out that
the increment percentages of concrete properties at early ages in all
microbial groups are greater than those at later ones. This could be
explained that the functionality of bacteria in concrete depends mainly
on time. The corrosion rate was reduced significantly in the fresh-water
bacterial and algal mix compared to their control counterpart one. The
SEM investigated more CaCO 3 crystal growth in the fresh-water cured
bacterial mix more than its coordinates in the control one mix. The
EDX analysis indicated that the fresh-water cured microbial (bacterial
and algal) mixes higher precipitates of calcite minerals, while the
control one was conservative. This phenomenon is in advance related to
the microbiologically induced calcium carbonates precipitation.