Effects of expansive filler and headed rebar on the shortening of development length of mortar-filled joints

• Published in: Journal of Building Engineering 2021-08, Vol.40, p.102338, Article 102338
• Main Authors: Murakami, Rikiya, Onoue, Kozo, Morimoto, Kento, Hashimoto, Ryota
• Format: Article
• Language: English
• Subjects: Cement-based-highly-expansive filler; Development length; Expansive additive; Headed rebar; Mortar-filled joint
• ISSN: 2352-7102; 2352-7102
• DOI: 10.1016/j.jobe.2021.102338

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/mm2 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. •A new type of mortar-filled joint with short development length is proposed.•Combined use of headed rebar and cement-based-highly-expansive filler is the key.•Using those technologies, relatively short development length of 3.5 d is achieved.