期刊
MATERIALS
卷 12, 期 18, 页码 -出版社
MDPI
DOI: 10.3390/ma12183050
关键词
self-consolidating; lightweight concrete; bloated aggregate; compressive strength; flexural behavior; fly ash
类别
资金
- China National Key RD Program-Intergovernmental International Scientific and Technological Innovation Cooperation Key Project, Research on the application and demonstration of the green construction materials for the post-disaster reconstruction in Pakis [2018YFE0106300]
This paper assesses the mechanical and structural behavior of self-consolidating lightweight concrete (SCLWC) incorporating bloated shale aggregate (BSA). BSA was manufactured by expanding shale pellets of varying sizes by heating them up to a temperature of 1200 degrees C using natural gas as fuel in the rotary kiln. Fly ash (FA) and limestone powder (LSP) were used as supplementary cementing materials (10% replacement of cement, each for LSP and FA) for improved properties of the resulting concrete. The main parameters studied in this experimental study were compressive strength, elastic modulus, and microstructure. The fresh-state properties (Slump flow, V-funnel, J-Ring, and L-box) showed adequate rheological behavior of SCLWC in comparison with self-consolidating normal weight concrete (SCNWC). There was meager (2-4%) compressive strength reduction of SCLWC. Lightweight aggregate tended to shift concrete behavior from ductile to brittle, causing reduced strain capacity and flexural toughness. FA and LSP addition significantly improved the strength and microstructure at all ages. The study is encouraging for the structural use of lightweight concrete, which could reduce the overall construction cost.
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