期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 269, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.121263
关键词
Recycling; Mechanical testing; In-fresh properties; Recycled aggregate concrete; Precast; Self-compacting concrete
资金
- Junta de Castilla y Leon (Regional Government) [UIC-231, BU119P17]
- MINECO [BIA2014-55576C2-1-R]
- FEDER (European Regional Development Funds)
This study analyzed the mechanical properties and physical characteristics related to transport mechanisms of recycled self-compacting concrete, demonstrating that the use of crushed precast concrete waste is a viable and sustainable alternative. The mechanical properties of recycled SCC are similar to those of control SCC, and the durability meets the standards for high-quality concrete.
The objective of this paper was to analyze the influence of crushed precast concrete waste on the transport mechanisms as indicators of the durability of precast recycled self-compacting concrete (SCC) as an alternative to the coarse fraction of natural aggregate. The replacement percentages were 20%, 50% and 100%, by weight, of the silica gravel 2/12.5 mm. Two types of SCC were manufactured: the first with a minimum compressive strength of 30 MPa (HR-30) and the second with a minimum strength of 45 MPa (HR-45). The recycled SCC's mechanical characteristics such as compressive strength, splitting tensile strength, flexural strength and modulus of elasticity were analyzed. Regarding the physical properties related to transport mechanisms, the influence of the recycled aggregate on the porosity, absorption, penetration of water under pressure, density of hardened concrete and ultrasonic pulse velocity was analyzed. All these properties were compared with those of a control concrete. The results of the mechanical tests provide values close to those obtained for the control SCC, while, in terms of durability the results fulfil the limit values that are considered for a good quality concrete. Therefore, it can be concluded that the use of crushed precast concrete waste with different degrees of substitution is a viable alternative in the manufacture of more sustainable SCC. (C) 2020 Elsevier Ltd. All rights reserved.
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