4 research outputs found
Mechanical properties and spalling at elevated temperature of high performance concrete made with reactive and waste inert powders
No full textIn this article, the efficiency of waste glass powder was investigated in enhancing the mechanical properties of concrete at high temperature. Chemical composition of this powder reveals that it plays good role as effective inert very fine material in concrete strength improvement. Conventional reactive pozzolanic powder of silica fume was used also in present work to show the degradation degree in concrete strength under firing in comparison to concrete made with waste glass powder. The experimental program was comprised of tests for examining fire resistance and mechanical properties of high strength concrete (HSC) after firing. Fifty-six concrete cylinders and prisms were manufactured for measuring their compressive and flexural strengths, modulus of elasticity and stress-strain behavior at high temperature. Failure modes were considered also for the specimens after fire exposure. Results demonstrate the great role of waste glass powder in conserving residual strength at high temperature. Accordingly, it is proved that the HSC made with waste glass powder has strength at high temperature more than that for concrete fabricated by silica fume
Mechanical properties and efficiency of SIFCON samples at elevated temperature cured with standard and accelerated method
No full textThis research shows the results and conclusions of an experimental study that aims to shed light on the mechanical performance of Slurry Infiltrated Fiber Concrete (SIFCON) (i.e. compressive strength, splitting tensile strength, flexural strength, Poisson's ratio, elastic modulus, and ultra-sonic pulse velocity (UPV) and explore its efficiency at elevated temperature (i.e. 200, 400 and 600 ?C) with different steel fiber ratios of 5 %, 7.5 %, and 10 % cured standard and in boiling water (accelerated curing). Hence, sets of cylinders and prisms are cast and tested under ASTM standard conditions. The results indicate that mechanical properties improve by increasing the steel fiber ratio up to 7.5 % in the case of a standard curing system, but more improvement is achieved with a steel fiber ratio up to 10 % in case of accelerated curing with boiling water. Also, the results indicate the superiority of the accelerated curing method for flexural and splitting tensile strength. Fly ash has a good contribution to the enhancement of mechanical performance of SIFCON with high steel fiber ratios. A decreasing and drastic reduction in compressive strength with increasing temperature above 200 and 400 ?C for control specimens and SIFCON specimens with fiber ratios of 5 %, respectively are observed. While a dramatic gain in the strength of SIFCON samples with fiber ratios of 7.5 % and 10 % is concluded. High ratios of steel fiber can retard the spalling of concrete; hence it makes SIFCON the unique material for resisting explosive loads
Engineering properties of sustainable green concrete incorporating eco-friendly aggregate of crumb rubber: A review.
No full textThe disposal of waste rubber tires has become a main ecological issue around the world. Each year, millions of tires are disposed of, buried, or thrown away, which is a severe hazard for the environment due to its prolonged degrading period. Therefore, recycling waste rubber as aggregates as a supplemental construction material is beneficial. The usage of crumbs rubber (CR) would be led to sustainable utilization of waste material, which would preserve depleting natural aggregate sources and protecting the environment. This paper reviews the published research on the performance of concrete containing CR as eco-friendly aggregates. Moreover, it highlights the impact in terms of aggregate substitution content, form, size, and waste treatment on the fresh and mechanical properties of crumb rubber concrete (CRC). The paper also aims to update the database for further experimental and numerical research on rubberized concrete.The disposal of waste rubber tires has become a main ecological issue around the world. Each year, millions of tires are disposed of, buried, or thrown away, which is a severe hazard for the environment due to its prolonged degrading period. Therefore, recycling waste rubber as aggregates as a supplemental construction material is beneficial. The usage of crumbs rubber (CR) would be led to sustainable utilization of waste material, which would preserve depleting natural aggregate sources and protecting the environment. This paper reviews the published research on the performance of concrete containing CR as eco-friendly aggregates. Moreover, it highlights the impact in terms of aggregate substitution content, form, size, and waste treatment on the fresh and mechanical properties of crumb rubber concrete (CRC). The paper also aims to update the database for further experimental and numerical research on rubberized concrete
