الفهرس | Only 14 pages are availabe for public view |
Abstract Environment protection is considered as one of the major challenges for our society. One of the important issues is the reduction of the environment impact of waste materials due to demolition constructions. At present these topics are getting considerable attention as part of sustainable development programs. The concrete cast using recycled aggregates from construction and demolition wastes (C&DW) as a structural concrete is considered as an alternative to conventional concrete. That type of concrete is called recycled aggregates concrete (RAC), the use of RAC preserves natural resources and reduces the space required for the disposal of RCA in landfill. These types of recycled aggregates have large absorption ability for water. Therefore, RAC needs more amounts of water for mixing and curing. So, the use of a type of concrete does not need conventional curing such as self-curing concrete may recommended. The combination of two types provides a suitable solution for the protection of the environment, preserve natural resources. The main objective of this research is using the demolitions of buildings as a coarse aggregate in self-curing concrete as recycled-aggregate self-curing ”RASC” concrete. Durability of this type was studied. Experimental program is divided to three parts. The first part studied the mechanical properties of RAC and how to enhance these properties using superplasticizer. The second part studied the effect of chemical curing agent on the fresh and hardened concrete properties of RA-SC concrete. The third part aimed to study the durability of this type of concrete under the chloride and sulfate attack. The fresh properties of RA-SC concrete was illustrated in the term of slump test. The hardened properties of RA-SC concrete were introduced in terms of compressive strength, splitting tensile, flexure and bond tests. Based on this study, we can obtain recycled-aggregate self-curing concrete using suitable dosage of curing agent. Also, RA-SC concrete performed well under the attack of the chloride and sulfate (in the range of this study) |