T/JSJTQX 15-2020 Active Group standards

T/JSJTQX 15-2020 Mix type recycled coarse aggregate concrete mix proportion design regulations

Publish Date: 2020-12-27 Implement Date: 2021-01-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/JSJTQX 15-2020

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Concrete products

ICS Name: Concrete and concrete products

Publish Date: 2020-12-27

Implement Date: 2021-01-01

Scope

Scope: This document specifies the material selection, mix design, preparation and transportation, and quality acceptance of hybrid recycled coarse aggregate concrete. This document is applicable to hybrid recycled coarse aggregate concrete used in cement concrete road pavements, industrial and civil buildings, and general structures. Main technical content: The main technical content of this standard is the determination of key parameters (replacement rate of hybrid recycled coarse aggregate, water content, water-cement ratio, and coarse and fine aggregate quantities) in the mix design of hybrid recycled coarse aggregate concrete. The replacement rate of hybrid recycled coarse aggregate and water-cement ratio are determined through experimental casting of one group of ordinary concrete and twenty-three groups of hybrid recycled coarse aggregate concrete. The water-cement ratio of ordinary concrete is set to 0.65, and the water-cement ratio of hybrid recycled coarse aggregate concrete is set to 0.58, with a reduction coefficient of 0.9 applied to the water-cement ratio of hybrid recycled coarse aggregate concrete based on that of ordinary concrete. Through statistical analysis of the experimental data, it is found that when the water-cement ratio of hybrid recycled coarse aggregate concrete is 0.9 times that of ordinary concrete, and the replacement rate of hybrid recycled coarse aggregate does not exceed 30%, and the brick content in the coarse aggregate does not exceed 15%, the mechanical properties of hybrid recycled coarse aggregate concrete can reach those of ordinary concrete. Therefore, the replacement rate is set to no more than 30%, and the brick content in the coarse aggregate does not exceed 15%. The water content is determined based on a reduction coefficient of 0.9 applied to the water content of ordinary concrete. The determination of water content primarily considers the impact of the high water absorption of hybrid recycled coarse aggregate on t