الفهرس 
CHAPTER 1 : INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 124 |  |  |
| | | from | 124 | | |
Abstract
Rubberized concrete is a form of concrete in which discarded tyre rubber particles are used instead of natural aggregates. This sort of concrete provides an environmental alternative to the millions of discarded tires. Numerous successful accomplishments have been recorded by researchers all throughout the world. However, in Egyptian researches using local materials, very rare information can be gathered. This thesis, generally, aims to evaluate both the mechanical and durability properties of concrete made with local rubber aggregates in Egypt since these properties are highly affected by the rubber source.
Two concrete groups were studied, each with a different target control strength. Each group had four different mixes, for a total of eight different mixes in which crumb rubber partially replaced fine aggregates by 0%, 10%, 15%, and 20% of volume. The effect of slump, compressive strength, splitting tensile strength, density, water absorption, water sorptivity, rapid chloride penetration, sulphric acid attack, and exposure to elevated temperatures of 300o C and 600o C were investigated.
The rubberized concrete mixtures had no significant effect on workability but they had lower density than the control mixes. Compressive strength and tensile strength were shown to be gradually decreasing. But up to 20% replacement, the reduction of compressive strength was within accepted ranges. Water sorptivity and chloride penetration decreased with increasing rubber percentages. Rubberized concrete has better performance compared to conventional concrete when exposed to sulphric acid attack. For concrete exposed to elevated temperature, a decreasing in compressive strength values of rubberized concrete is observed. It is possible to identify that rubberized concrete is extremely resistant to aggressive environments based on the results of durability testing.