Abstract
The effect of compressive strength and expansion rate of filler grout on bond behavior of grouted pipe splice is discussed. Three types of grout were designed and utilized to prepare coupler specimens as filler material. The compressive strength ranged from 67.5 to 91.8 MPa. The volume expansion rate changed from -0.023% to -0.037% under airtight curing condition, and from 0.027% to 0.057% under water curing condition, respectively. Based on pullout test, it was found that the bond strength and stiffness of grouted splice both improve with the increment of the expansion rate due to the increased initial confinement. By experimentally measuring the exterior surface transverse strain of grouted sleeve in curing stage, the confinement and its influencing factor on bond performance were derived. The confinement increases nonlinearly with the increment of grout shell thickness and sleeve radial stiffness other than grout expansion rate. The diameter-thickness ratio of sleeve should not exceed 13 to avoid a possible debonding failure at bar-grout interface. Utilizing the calculated confining pressures, the bond strength of the grouted splice was determined and compared with pullout test result, which shows a good agreement.
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Zheng, Y., Guo, Z. & Zhang, X. Effect of Grout Properties on Bond Behavior of Grouted Pipe Splice. KSCE J Civ Eng 22, 2951–2960 (2018). https://doi.org/10.1007/s12205-017-0034-y
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DOI: https://doi.org/10.1007/s12205-017-0034-y