Application of Conventionally Recycled Coarse Aggregate to Concrete Structure by Surface Modification Treatment
Source abstract
Abstract
This paper aims to establish a technique for easy concrete recycling as a solution essential for the creation of a closedloop recycling society. The technique introduced in this study enables improvement of the recovery rate of original aggregate by enhancing the peeling-off effect of aggregate without any degradation of mechanical properties. The enhanced peeling-off effect is realized by applying a surface improving agent to the aggregate.In this paper, material tests were conducted on recycled aggregates with low quality and middle quality. In the test, two types of surface improving agent, an oil-type improving agent and a silane-type improving agent, were used. The test results have shown that the recycled aggregate finished with silane-type improving agent was greatly improved in recovery rate but showed lowered strength. On the other hand, the recycled aggregate finished with oil-type improving agent was somewhat superior in recovery rate compared with non-finished aggregate. In addition the oil-type improving agent improved hardening properties. Flexural tests of reinforced concrete beams were conducted only for the oil-type improving agent. Consequently, the possible applicability of recycled aggregate finished with oil-type surface improving agent was verified.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Recycled Aggregate Concrete Performance
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Dept. of Architecture, Graduate School of Engineering, The University of Tokyo, Japan.
Dept. of Architecture, Graduate School of Engineering, Tokyo Metropolitan University, Japan.
Dept. of Architecture, Graduate School of Engineering, Tokyo University of Science, Japan.
Graduate School of Environmental Studies, Nagoya University, Japan.
References (8)
Show source-provided references
1. AIJ, (2006). “Recommendations for Practice of Crack Control in Reinforced Concrete Buildings. (Design and Construction)” Tokyo: Architectural Institute of Japan.
2. JCI, (2005). “A proposal toward the spread of concrete recycling systems. (Activity reports about advanced use of recycled concrete)” Tokyo: Japan Concrete Institute
3. Mukai, T., Kikuchi, M. and Koizumi, H. (1979). “Fun-damental Study on the Use of Recycled Aggregate Concrete for Structural Reinforced Concrete Mem-ber.” Review of the 33rd General Meeting (Technical Session), Japan Cement Association, (33), 120-121.
4. Noguchi, T. and Tamura, M. (2001). “Concrete design towards complete recycling.” Structural Concrete journal of the fib, 2(3), 155-167.10.1680/stco.2001.2.3.155 ↗
5. Sato, R., Kawai, K. and Baba, Y. (2000). “Mechanical Performance of Reinforced Recycled Concrete Beams.” Proceedings of International Workshop on Recycled Concrete, 127-146.
6. Shima, H., Tateyashiki, H., Matsuhashi, R. and Yoshida, Y. (2005). “An Advanced Concrete Recycling Technology and its Applicability Assessment through Input-Output Analysis.” Journal of Advanced Concrete Technology, 3(1), 53-67.10.3151/jact.3.53 ↗
7. TOYO INK MFG. Co., Ltd., (1995). “An aqueous organo-silicic compound.” Japanese patent application B2 H07-005400.
8. Wang, C. H. (2003). “The study of the surface improvement of the low quality recycled aggregate for structure concrete.” Thesis (M.A.). The University of Tokyo.