الفهرس 
introductionOnly 14 pages are availabe for public view
 |  | from | 185 |  |  |
| | | from | 185 | | |
Abstract
-The amount of construction and demolition wastes has increased considerably over the last few decades. from the environmental point of view preservation and effective utilization of resources, crushing concrete to produce coarse aggregate for the production of new concrete is one common means for achieving a more environment-friendly concrete. The experimental study demonstrates the mechanical properties of concrete containing fired recycled concrete aggregate. In the experimental work, the fresh concrete properties (slump test) and the hardened concrete properties (compressive strength, tensile strength, flexural strength and modulus of elasticity) were carried out. A total of sixty concrete mixtures were performed with different cement contents of 300, 350 and 400Kg/m3 at w/c = 0.5, the amount of water was adjusted according to cement content ,the superplasticizer dosage varied from 0.6% to 3.5% of cement content to achieve the required level of workability defined by a slump value of 10± 2cm. The percentage of replacement of natural coarse aggregate by fired recycled coarse aggregate at 600°C temperature for durations 1, 2, and 3hour and 300 , 800°C temperatures for durations 2hours was 0%, 25%, 50% and 100%. Control mixes made with the natural aggregate, and the other concrete mixes were made using a fired recycled coarse aggregates, the ratio of fine to coarse aggregate was about 1:2. In the process of mixing, equal consistence among all concrete mixes was achieved. The obtained results indicate that the fired recycled coarse aggregate can successfully be used for making structural concrete and non-structural concrete.