چكيده به لاتين
Today, due to the development of the construction industry and the use of concrete in most structures, the consumption of this material has increased sharply. Due to the use of recycled materials in the construction industry and the field of concrete technology with a sustainable development approach, it has been considered by researchers for many years. The concrete technology industry also seeks to use the waste of materials from other industries with this approach, due to the fact that aggregates constitute the largest volume of materials in concrete. Alternatives have always been a concern of researchers, so crumb rubber as a waste of another industry has been considered for use as an alternative to stone materials. In this research, crumb rubber was used as a substitute for a part of aggregate in percentages of 5%, 10%, 15% of aggregate volume and the rubbers left on the sieve were 14.75, 12.5, 9.5 and 4.75. Some mixtures of microsilica and zeolite are used next to the rubber particle and the ratio of water to cement is fixed in the designs. The experiments used in this study included compressive strength, flexural, tensile strength, modulus of static elasticity, porosity, water absorption percentage, ultrasonic and electrical resistance at 7 and 28 days of age. The results of this study showed that the greatest reduction in compressive strength is related to concrete containing 15% crumb rubber, so that by replacing 15% crumb rubber with aggregate volume, 35% compressive strength was observed at 28 days old and 36% at 7 days old. It was also reduced compared to control concrete by replacing 15% rubber with aggregate containing 10% zeolite and 10% microsilica, with compressive strength of 23% and 33% at 28 days and 21% and 34% at 7 days, respectively. Increased to concrete containing 15% crumb rubber. The highest reduction in flexural and tensile strength is related to the modulus of elasticity of concrete containing 15% crumb rubber, which was reduced to 21%, 27%, 35% compared to control concrete, respectively, and by replacing cement with microsilica, respectively 10%, 13%, 20 % Increased compared to concrete containing 15% crumb rubber. By replacing cement with zeolite, it increased by 11%, 9%, 2% compared to concrete containing 15% crumb rubber.
