title: Effect of recycled concrete aggregates on the mechanical properties of self-compacting concrete
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
Creators: name: ÐÑÐ¼ÐµÐ´, ÐÐ°ÑÐ¼ÑÐ´
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2020
Subjects: ÑÐ°Ð¼Ð¾ÑÐ¿Ð»Ð¾ÑÐ½ÑÑÑÐ¸Ð¹ÑÑ Ð±ÐµÑÐ¾Ð½
Ð¿ÐµÑÐµÑÐ°Ð±Ð¾ÑÐ°Ð½Ð½ÑÐµ Ð±ÐµÑÐ¾Ð½Ð½ÑÐµ Ð¾ÑÑ Ð¾Ð´Ñ
ÑÐ°Ð±Ð¾ÑÐ°Ñ ÑÐ¿Ð¾ÑÐ¾Ð±Ð½Ð¾ÑÑÑ
Ð¿ÑÐ¾ÑÐ½Ð¾ÑÑÑ Ð½Ð° ÑÐ¶Ð°ÑÐ¸Ðµ
Ð¿ÑÐ¾ÑÐ½Ð¾ÑÑÑ Ð½Ð° ÑÐ°ÑÑÑÐ¶ÐµÐ½Ð¸Ðµ Ð¿ÑÐ¸ ÑÐ°ÑÐºÐ°Ð»ÑÐ²Ð°Ð½Ð¸Ð¸
ÑÑÐ°ÑÐ¸ÑÐµÑÐºÐ¸Ð¹ Ð¼Ð¾Ð´ÑÐ»Ñ ÑÐ¿ÑÑÐ³Ð¾ÑÑÐ¸
self-compacting concrete
recycled concrete aggregates
coarse aggregate
workability
compressive strength
splitting tensile strength
static modulus of elasticity

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description: The aim of this research is to produce self- compacting concrete from recycled con-crete in accordance with the specifications of this type of fresh concrete. The percentage of replacement of coarse aggregate with recycled aggregates was 0%, 25%, 50%, 75% and 100%. Five main types of self- compacting concrete were used: self- compacting concrete free from recycled concrete aggregate (conventional), and self- compacting concrete con-taining (25%, 50%, 75% and 100%) of recycled concrete. To measure the self-compacting properties of these types of concrete, several laboratory methods have been used in the fresh state. Self-compacting concrete with different percentages of recycled concrete can be pro-duced by determining the appropriate dose for superplasticizers (4.5 to 7 l/m3) which is the main compound in producing good quality of recycled concrete aggregate and comprehen-sive on mineral additives. Compressive strength test, splitting tensile strength test, static modulus of elasticity test and ultrasonic pulse velocity test were conducted at ages of 7, 28 and 60 days.
The results showed that the self-compacting concrete with 25% and 50% coarse recy-cled concrete aggregate had a little increase in compressive strength by 1.23% and 2.44%, respectively, at the age of 28 days compared to the conventional self- compacting concrete. Whereas, there was no significant difference in compressive strength between the self- com-pacting concrete containing 25% and 50% of the recycled concrete aggregate at the age of 60 days. Other than that, concrete containing 75% and 100% aggregates of recycled concrete showed a decrease in compressive strength at different ages, ranging from (6.75-9.4%) and (9-13.5%), respectively. The results also showed that the percentage decrease in splitting tensile strength, modulus of elasticity, and velocity of the ultrasonic waves ranged between (2.5- 22.5) %, (4.3- 30) % and (0.4- 7.6) %, respectively, compared to conventional self-compacting concrete at different ages.