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Effect of treatment in recycled aggregate on properties in fresh and hardened state of self compacting concrete.

10.24050/reia.v19i38.1547
Published 2022-06-01
Articles

Abstract

The use of recycled aggregates from construction and demolition waste (CDW) in new civil works is considered a way to sustainable development. This study presents the possibility of using recycled coarse aggregate (RCA) and treated coarse aggregate (TCA) from concrete in self-compacting concretes (SCC). For this purpose, two treatment methods were carried out to AGR, one of the treatments was by mechanical wear in a ball mill and the other was by immersion in an acid solution (H2SO4) combined with mechanical wear. To investigate the effect of different RCAs treatment on the mechanical properties of SCCs, different replacement levels (0%, 20%, 40% and 100% by volume) of natural coarse aggregate (NCA) by AGR and TCA were carried out. In the fresh state, filling ability, passing ability, workability and resistance to segregation were assessed using the Abrams cone (slump flow), V-funnel and L-box, and in the hardened state, tests of compression strength, indirect tensile strength and flexural strength were carried out to the SCCs. The results indicated that the increased proportions of RCA presented a decrease in the performance of the properties in the fresh and hardened state due to the presence of the mortar adhered in this type of aggregates, however, the workability re well-matched with the limitations provided by EFNARC. The SCCs with TCA presented a better performance compared to the SCCs with RCA. The mechanical properties of the SCC with TCA presented a better performance compared to the SCC with RCA, due to the removal of the adhered mortar, improving the compressive strength in all SCC with TCA. In addition, the SCCs with TCA showed improvements in the permeability properties, presenting a reduction in porosity of up to 6.06%.

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Authors

  • Yimmy Fernando Silva Urrego

    Universidad del Valle

  • Alejandro Arcila Castro

  • Silvio Delvasto

References

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