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Specimen Size Effects and Dynamic Fracture Toughness of Cement-Based Foams
This paper presents the effect of geometrically similar specimen size on the mechanical properties of cement-based foams. The experimental study also investigates fracture-mechanical parameters under flexural impact. A preformed foam was employed to prepare the specimens using a synthetic foaming agent that was known to achieve a stable bubble structure. The cement-based foams were prepared to a cast density of and were examined under compression and flexure. Along with a plain unreinforced mix, polypropylene fiber at a volumetric fraction of 0.2% was used to study the effect of microfiber reinforcement. The tested specimens scaled between one to four times in dimension. Parameters associated with their dynamic-fracture mechanics were evaluated under flexure with the help of a drop-weight impact tester equipped with a high speed imaging system. Bažant’s size effect model and the multifractal scaling model were employed to describe the size effect. It was seen that when subjected to compression, the fiber-reinforced specimens demonstrate a noticeable size effect, whereas, under quasi-static flexure, the more significant size effect was observed for the plain specimens. As expected, fiber reinforcement improved the Mode I fracture toughness at all sizes.
Specimen Size Effects and Dynamic Fracture Toughness of Cement-Based Foams
This paper presents the effect of geometrically similar specimen size on the mechanical properties of cement-based foams. The experimental study also investigates fracture-mechanical parameters under flexural impact. A preformed foam was employed to prepare the specimens using a synthetic foaming agent that was known to achieve a stable bubble structure. The cement-based foams were prepared to a cast density of and were examined under compression and flexure. Along with a plain unreinforced mix, polypropylene fiber at a volumetric fraction of 0.2% was used to study the effect of microfiber reinforcement. The tested specimens scaled between one to four times in dimension. Parameters associated with their dynamic-fracture mechanics were evaluated under flexure with the help of a drop-weight impact tester equipped with a high speed imaging system. Bažant’s size effect model and the multifractal scaling model were employed to describe the size effect. It was seen that when subjected to compression, the fiber-reinforced specimens demonstrate a noticeable size effect, whereas, under quasi-static flexure, the more significant size effect was observed for the plain specimens. As expected, fiber reinforcement improved the Mode I fracture toughness at all sizes.
Specimen Size Effects and Dynamic Fracture Toughness of Cement-Based Foams
Mamun, Muhammad (author) / Bindiganavile, Vivek (author)
Journal of Materials in Civil Engineering ; 26 ; 143-151
2013-01-18
92014-01-01 pages
Article (Journal)
Electronic Resource
Unknown
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