Effect of recycled coarse aggregate on concrete compressive strength |
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| Authors: | WANG Zhenshuang WANG Lijiu CUI Zhenglong ZHOU Mei |
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| Institution: | 1. School of Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China
2. College of Civil Engineering and Architecture, Liaoning Technical University, Fuxin 123000, China |
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| Abstract: | The effect of recycled coarse aggregate on concrete compressive strength was investigated based on the concrete skeleton theory.
For this purpose, 30 mix proportions of concrete with target cube compressive strength ranging from 20 to 60 MPa were cast
with normal coarse aggregate and recycled coarse aggregate from different strength parent concretes. Results of 28-d test
show that the strength of different types of recycled aggregate affects the concrete strength obviously. The coarse aggregate
added to mortar matrix plays a skeleton role and improves its compressive strength. The skeleton effect of coarse aggregate
increases with the increasing strength of coarse aggregate, and normal coarse aggregate plays the highest, whereas the lowest
concrete strength occurs when using the weak recycled coarse aggregate. There is a linear relationship between the concrete
strength and the corresponding mortar matrix strength. Coarse aggregate skeleton formula is established, and values from experimental
tests match the derived expressions. |
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| Keywords: | recycled coarse aggregate compressive strength concrete skeleton model skeleton formula crushing index |
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