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译文原文：
Feasibility study of using fine recycled
concrete aggregate in
producing self-consolidation concrete
J. Hu*, Z. Wang and Y. Kim
Department of Engineering Technology, Texas State University, San Marcos, TX, USA(Received 20 October 2012; final version received 12 October 2012) Concrete recycling provides sustainability benefits in conservation of virgin aggregate
resources, landfill reduction, energy savings, and reduced greenhouse gases emission.Effective and new uses of recycled concrete aggregate (RCA) in cement and concrete industry have attracted a lot of researchers’ attention from the perspective of environmental preservation and sustainable utilization of resources. While local RCA could be successfully used in portland cement concrete, most of the RCA, particularly fine recycled concrete aggregate (FRCA) are currently only used in low-profile applications. A feasibility study of usage of FRCA (up to 100% replacement of natural fine aggregate) in high-performance concrete such as self-consolidation concrete (SCC) is needed. This paper presented a preliminary study in using FRCA to obtain SCC with comparable properties as such of using natural fine aggregate. In order to evaluate the
influence of different portions of FRCA in SCC, tests including slump-flow, J-ring, V-funnel, L-box, and visual stability index were used to assess the flowability, passing ability, and segregation resistance of concrete mixtures. In addition, a concrete rheometer was used to measure the rheological properties of concrete. Strength properties of concrete were evaluated through compressive strength and volume
stabilities of harden concrete were measured by drying shrinkage tests. Results showed that while the higher amount of fine particles in FRCA does affect flowability, passing ability, segregation resistance, and rheological performance as well as hardened concrete behaviors of SCC, most of the mixtures included in the study show good flowability, passing ability and stability, and well satisfy criteria of SCC. Both compressive strength and drying shrinkage tests indicate good performance with SCC made with FRCA. The study demonstrated that it is possible to obtain SCC using FRCA with appropriate mix proportions and the feasibility of utilizing FRCA for SCC has been demonstrated.
Keywords:
self-consolidation concrete; recycled aggregate;
flowability; rheology;passing ability
1. Introduction
Self-consolidating concrete (SCC), also known as self-compacting
concrete, is an innovative technology that was first developed in Japan in the 1980s.[1] Since then, the market share of its products has been rapidly growing owing to the enhanced quality of the concrete and the improved working environment. SCC is a highly flowable, nonsegregating concrete that can spread into place, fill the formwork, and encapsulate the reinforcement without the need of mechanical consolidation.
The highly flowable nature of SCC allows it to be consolidated under its own mass, which makes it possible for placing it in difficult construction conditions or in sections with congested reinforcement. SCC can considerably reduce the time that is required to place large sections by eliminating the vibration process during concrete casting. This in turn helps minimize noise and hearing impairment-related injuries in the worksite. SCC has to be carefully designed as it has to achieve high flowability and passing ability, while maintain enough stability to resist segregation. Therefore, despite all above-mentioned technical and environmental advantages, the use of SCC in construction, especially in the USA is still limited owing to the sensitive mixture design and relatively high cost of this technology results from the larger amount of cement and admixtures used in mix design.
While SCC has significant environmental advantages in comparison to convention concrete due to the absence of noise and vibration during construction, effective and new uses of recycled concrete aggregate (RCA) in cement and concrete industry have also attracted a lot of researchers’ attention from the perspective of environmental preservation and sustainable utilization of resources. Concrete recycling not only conserves virgin aggregate resources, but also reduces unnecessary consumption of limited landfill space, saves energy, reduces greenhouse gas emissions, and actually removes CO2 from the air. It was estimated
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