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http://dx.doi.org/10.11112/jksmi.2019.23.2.28

Performance of Recycled Coarse Aggregate Concrete with Nylon Fiber  

Lee, Seung-Tae (Department of Civil Engineering, Kunsan National University)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.23, no.2, 2019 , pp. 28-36 More about this Journal
Abstract
The adhered mortars in recycled aggregate may lower the performance of the concrete, such as by reducing in strength and durability, and cracking. In the present study, the effects of nylon fiber (NF) on the mechanical and durable properties of 100% ordinary portland cement (OPC) and 50% ground granulated blast furnace slag (GGBFS) concretes incorporating recycled coarse aggregate (RA) were experimentally investigated. Concrete was produced by adding 0 and $0.6kg/m^3$ of NF and then cured in water for the predetermined period. Measurements of compressive and split tensile strength, water permeable pore and total charge passed through concrete were carried out, and the corresponding test results were compared with those of concrete incorporating crushed coarse aggregate (CA). In addition, the microstructures of 28-day concretes were observed by using SEM technique. Test results revealed that the RA concrete showed lower performance than CA concrete because of the adhered mortars in RA. However, it was obvious that the addition of NF in RA concrete was much effective in enhancing the performance of the concretes due to the bridge effect from NF. In particular, the application of NF2 (19 mm) exhibited a somewhat beneficial effect compared with concrete incorporating NF1 with respect to mechanical properties, especially for RA concrete.
Keywords
Recycled coarse aggregate; Concrete; Nylon fiber; Adhered mortar;
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Times Cited By KSCI : 1  (Citation Analysis)
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