Abstract
This paper presents an experimental study of the behavior of Normal Concrete Beams (NCB) and composite beams with lightweight foamed concrete (CB), reinforced with steel bar measuring 2 f 8 mm in the compressive section and 2 D 16 mm in the tensile section, shear steel bar f 8 mm. The sample consisted of two normal concrete beams (NCB) and two composite beams with lightweight foamed concrete (CB). The main variables in this study are the type of concrete, the type of steel bar and the flexural behavior. The beam samples were tested by two-point loading, failure mode and crack width were observed. The results showed that the flexural process of normal concrete blocks (NCB) and composite beams with lightweight foamed concrete (CB) was almost the same. There is no slip failure at the combined interface, the flexural capacity of the composite beam with lightweight foamed concrete can be calculated based on the statics analysis and plane-section assumptions. To calculate the ultimate capacity of a composite beam with lightweight foamed concrete is to convert a section consisting of more than one fc' to an equivalent section consisting of one fc'. Furthermore, it is validated by calculating the theoretical moment capacity and comparing the theoretical moment capacity of the experimental results. The results of the flexural test, composite beam with lightweight foamed concrete (CB) showed ductile deflection behavior, diagonal crack patterns, and low flexural capacity of the beam (NCB). Doi: 10.28991/cej-2021-03091673 Full Text: PDF
Highlights
The purpose of using composite beams with lightweight foamed concrete is to reduce the total weight of the structure by using materials with low mass
The first crack occurred in Normal Concrete Beams (NCB)-1 when the applied load reached 12,328 kN, on NCB-2 when the applied load reached 15,927 kN while the first crack occurred in composite beam (CB)-1 when the applied load reached 3,932 kN, on CB-2 when the applied load reached 4,398 kN
Tabel 7 shows on the normal beam (NBC-1), (NBC-2) the failure was initiated by the yielding of the steel reinforcement and followed by the compression failure on the concrete
Summary
The purpose of using composite beams with lightweight foamed concrete is to reduce the total weight of the structure by using materials with low mass. The stress on the external fibres are higher, so it should be used a stronger material. In the internal fibres the stress is lower so it could be used a less resistant material. There are a number of studies which analyse separately the behaviour of both materials. The references about the combine use is quite reduced [2]. Foam concrete is a lightweight material consisting of Portland cement paste or cement filler matrix (mortar) with a homogeneous void or pore structure created by introducing air in the form of small bubbles, At higher foam volume, results in wide distribution of void sizes and lower strength [3]
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