الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 133 |  |  |
| | | from | 133 | | |
Abstract
This experimental research aims at investigating the possibility of utilizing local waste glass and
silica fume in the production of concrete for construction. An experimental program is conducted
in two stages. The first stage studies the effect of using glass powder (GP) obtained by crushing
of local glass wastes as partial substitute of cement (with percentages 0%, 10%, 15%, 20%, and
25% by weight of cement) on the fresh and hardened properties of concrete. In the second stage,
silica fume is used as partial replacement of cement with percentages 5%, 7.5%, and 10% by
weight of cement while using the optimum percentage of (GP). Two methods of mixing were used.
The traditional mixing method, which involves adding glass powder to cement and aggregates, is
compared with the second approach, in which the glass powder is first dissolved in water. For all
mixes, slump test is made for fresh concrete; tests are made for hardened concrete to evaluate
compressive strength, splitting tensile strength and flexural strength. Experimental results show
increase of workability by increasing GP content but it decreased by increasing SF content.
Concrete compressive strength was reduced for all mixes containing glass powder, but is improved
with time. Using silica fume improved concrete compressive strength for all mixes. The tensile
strength of concrete is improved when 20%GP is used in substitute of cement. The results showed
that as the amount of GP increases the flexural strength increased. In comparison to control
concrete without glass powder, compressive strength was significantly close at 56 days with the
use of 20% glass powder (local waste glass), tensile strength was also significantly higher at 28
days, and flexure strength increased by 18.6% at that time. The properties of GP concrete were
enhanced when SF was added, and the second mixing approach outperformed the traditional
mixing approach in terms of outcomes.