Paper Title
Study The Use Of Recycled Aggregates In The Casting Shallow Foundations
Abstract
Due to the shortage of space for land reclamation in Qena Governorate, it is difficult to dispose tons of
construction, Adoption of recycled aggregate from concrete waste. Most of studies held in Qena Governorate on recycled
aggregate produced from construction and demolition wastes, focused on using recycled aggregate as granular material for
base coarse roads and for concrete mixes for concrete hollow blocks. The percent of fine recycled aggregate in the all
recycled aggregate was about 9.0% so it was excluded from the study. 0 % and 40 % of coarse recycled aggregate was used
in the experimental tests. Two kinds of natural fine aggregates were used, Qena sand and crushed stone. The experimental
tests focused on, physical properties density and workability, and mechanical properties compressive strength, flexural
strength and bond strength between concrete and steel in raft foundation for example. More than 70 concrete specimens were
tested for the study. The tests showed that the workability of recycled aggregate is lower than the workability of natural
aggregate concrete ,the slump test was about 1.0cm slump for 40 % coarse recycled aggregate concrete and increases as the
percent of recycled aggregate decreases . The compressive strength of recycled aggregate concrete with 40 % recycled
aggregate, is about 85% of natural aggregate concrete. The compressive strength increases as the Percent of recycle
aggregate in concrete mixes decreases.
Keywords- Recycled Aggregate, Compressive Strength, Raft Foundation, Natural Aggregate