Effects of expansive filler and headed rebar on the shortening of development length of mortar-filled joints
| Autor: | Rikiya Murakami, Kento Morimoto, Kozo Onoue, Ryota Hashimoto |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Filler (packaging)
Materials science Grout 0211 other engineering and technologies Rebar 02 engineering and technology Building and Construction engineering.material law.invention chemistry.chemical_compound chemistry Mechanics of Materials law Precast concrete 021105 building & construction Architecture engineering 021108 energy Composite material Mortar Safety Risk Reliability and Quality Calcium oxide Joint (geology) Civil and Structural Engineering Lime |
| Zdroj: | Journal of Building Engineering. 40:102338 |
| ISSN: | 2352-7102 |
| DOI: | 10.1016/j.jobe.2021.102338 |
| Popis: | In this paper, the shortening of the development length of mortar-filled joints that connect precast concrete members is studied focusing on the use of expansion fillers and headed rebars. Rebars with a diameter of 13 mm are used. First, specimens are prepared with different dosages of lime-based expansive additive containing calcium oxide as the main component in commercial high-strength-non-shrink mortar or low-viscosity grout. It is found that the load-bearing performance of the mortar-filled joint is improved when the expansive additive is added to the high-strength-non-shrink mortar. However, in all cases, pullout failure occurs and rebar failure cannot be achieved. Second, a cement-based-highly-expansive filler mainly composed of calcium oxide and silicate with a swelling pressure of 40 N/mm 2 or more at 3 days is employed. As a result, it is found that the rebar failure can be achieved for a development length of 4 d (52 mm). To further shorten the development length, headed rebar is then used as an inserted rebar. The test results show that rebar failure can be achieved when using a comparatively short development length of 3.5 d (45.5 mm). It is concluded that the use of a cement-based-highly-expansive filler and a headed rebar is effective in shortening the development length of mortar-filled joints. |
| Databáze: | OpenAIRE |
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