Abstract
Due to repeated wars against Iraq as well as the terrorist operations lead to demolition of many government and commercial buildings and thus necessitating the demolition of these buildings and throwing them as a rubble. Also any concrete structure reaches its end life, it is either repaired or demolished and transformed to waste. The waste materials were transferred to landfill and no longer used. These waste will increase with time and cause an environmental problem. So, this study was prepared to examine the ability of crushing and reusing of the demolition waste as a coarse aggregate in the production of new concrete known as a Recycled Aggregate Concrete. This study consists of two parts: experimental and theoretical parts. Both parts dealt with the effect of using recycled concrete aggregate (RCA) as a partial replacement of natural coarse aggregate in self-compacting concrete, on the structural behavior of reinforced concrete corbels. The replacement percentages were used in this study (0%, 25%, 50%, and 75%). The experimental part consists of casting and testing of ten self-compacting reinforced concrete corbels which made with either natural coarse aggregate or with a partial replacement of natural coarse aggregate by recycled concrete aggregate then the experimental results was compared with the analytical results (finite element results). The analytical part was carried out by using ANSYS program (version 18). In ANSYS program three types of elements were used in the modeling of each corbel specimen. The elements are Solid65, Link180 and Solid185. Solid 65 element was used to represent of concrete while link180 element was used to represent of steel reinforcement and finally solid185 element was used to represent the steel plates at supports and under the applied load. The ANSYS software is used to simulate the load bearing capacities of the reinforced concrete corbel and then compared with the experimental results. The results show that there is a good coincidence between the experimental and analytical results. Therefor the ANSYS software can be used to predict the shear strength of SCC corbels containing RCA with acceptable accuracy.
Highlights
The ANSYS software is used to simulate the load bearing capacities of the reinforced concrete corbel and compared with the experimental results
To design the corbels two methods are used which are shear – friction theory according to ACI Code and the strut and tie models according to European code (S.J Foster and RE Powell, 1994)
MATERIALS AND EXPERIMENTAL WORK The experimental program consisted of laboratory tests for aggregates and plain concrete to characterize the properties of self-compacting concrete such as filling and passing ability and segregation resistance for fresh state
Summary
Concrete is considered as a construction material consists of cement, coarse aggregate, fine aggregate and water. The availability of the normal aggregate is considered limited the usage of the recycling waste material is a proper solution to produce the concrete. Japan has created a technology to give a high quality recycled aggregate from demolition waste by utilizing rubbing and heating method. Toward that technology those aggregates might be reused likewise a raw materials used in the preparing of concrete mixes. Recycled aggregate is formed from demolition waste and crushing construction materials. When it is obtained from crushing of old concrete it is called a recycled concrete aggregate (RCA) which is required high equipment technology and energy (Yoshimi and Hirokazu, 2005)
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