Improving Structural Performance of Residential RC (Reinforced Concrete) Buildings through Adding Crumb Rubber Particles
Posted: 24 Jun 2019 Last revised: 2 Jul 2019
Date Written: June 21, 2019
End-of-life tyres (ELT) are a major environmental challenge across the world. Each year around one billion tyres reach the end of their life, however only 30% of these are recycled. There is an urgent need to develop markets to extend the application of recycled tyre products. One solution is to add rubber particles to concrete as partial replacement for the fine aggregate. The newly developed concrete is named crumb rubber concrete (CRC). This paper addresses the structural applications of CRC in residential buildings. The structural performance of crumb rubber concrete (CRC) under static and low-velocity impact loads was studied. An innovative setup was designed to investigate the impact behavior of concrete material based on a drop-weight test. The drop-weight velocity before and after impact were recorded through a laser system. Based on the velocity variation, the energy that was absorbed in the concrete material during the test, which was also the impact resistance of the sample’s failure section, was calculated. CRC samples with rubber percentages varying from 0 to 20% were tested. Experimental results verified the advantages of using rubber on material impact behaviour. As a structural application, reinforced CRC slabs were tested under static and impact loads. Experimental results showed that CRC slabs exhibited superior post-cracking performance with member moment capacities comparable or even higher than those of reinforced traditional concrete (TC) slabs. Impact tests on the slabs showed significant reduction in the peak stress response in CRC slabs when compared with TC slabs. The research verified the benefit of applying CRC in residential slabs in both static and dynamic performances. Finally, the potential applications of CRC in other building components such as beams/columns, composite columns, shear walls, are discussed through analysing the test data from existing literature, where CRC improves the dynamic performance but reduces the static strength. It is recommended that CRC slabs have broader applications than other CRC components which are only suitable to buildings in seismic areas.
Keywords: building structures; crumb rubber concrete (CRC); reinforced CRC slab; impact resistance; drop weight test; static flexural test
JEL Classification: R
Suggested Citation: Suggested Citation