This study carried out the experiment to evaluate the effects of different contents and sizes of rubber particles derived from discarded tires used for replacing fine and coarse natural aggregates, on the workability of fresh rubberized concrete and the compressive and flexural strengths of hardened rubberized concrete. The study results showed that the workability of fresh rubberized concrete was improved when replacing natural fine aggregate (sand) with fine rubber particles (2.5-5 mm) at the replacing proportions of 30-50% by volume, and when replacing natural coarse aggregate (crushed stone) with coarse rubber particles (5-20 mm) at the replacing proportions of 10-30% by volume. With respect to the mechanical properties of hardened rubberized concrete, a larger reduction in the compressive and flexural strengths was generally found when the replacing proportions increased and when coarse aggregate rather than fine aggregate was replaced by rubber particles at all replacing proportions (10-50%). However, the study results also indicated that using fine rubber particles for replacing fine natural aggregate at the low replacing proportion (up to 10%) might not cause the significant effect on the compressive and flexural strength of rubberized concrete.
Article HistoryThis study aims to explore the possibility to use rubber particles derived from discarded tire as aggregates for replacing fine and coarse natural aggregates to produce cement concrete towards resource recovery and environmental protection in Vietnam. The experimental results showed that the workability of fresh rubberized concrete was improved when replacing natural fine aggregate (sand) with fine rubber particles (2.5-5 mm) at the replacing proportions of 30-50% by volume, and when replacing natural coarse aggregate (crushed stone) with coarse rubber particles (5-20 mm) at the replacing proportions of 10-30% by volume. With respect to the mechanical properties of hardened rubberized concrete, a larger reduction in the compressive and flexural strengths was generally found when the replacing proportions increased and when coarse aggregate rather than fine aggregate was replaced by rubber particles at all replacing proportions. However, the study results also indicated that using fine rubber particles for replacing fine natural aggregate at the low replacing proportion (up to 10%) might not cause the significant effect on the compressive and flexural strength of rubberized concrete.Contribution/Originality: This is the first ever study in Vietnam to investigate the potential for using rubber particles derived from discarded tires to replace natural aggregates in producing cement concrete towards resource recovery and environmental protection in Vietnam.
Using recycled aggregates (RA) from construction and demolition wastes to produce nonstructural concrete is a sustainable solution with dual environmental benefits. There is potential to use RA to manufacture pervious concrete for permeable pavement systems. The ratio of concrete and clay brick aggregates, designed porosity, and the complete mix design has been evaluated for their contributions to making pervious concrete blocks. In this study, the porosity characteristics, hydraulic conductivity and mechanical properties of the pervious concrete made in Vietnam were investigated aiming to characterize the relationships among mechanical properties, total and effective porosities, and water permeability. Experimental results showed that the mechanical strengths decreased basically with increasing of the design porosity, in especial, the previous blocks made from clay brick aggregate led to the lowest of compressive and flexural strength. The ratio of mixed aggregates, on the other hand, gave a negligible influence on the effective porosity and permeability of pervious concrete blocks, and the water permeabilities were mainly controlled by the total porosities of tested pervious blocks.
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