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Civil Sustain. Urban Eng. , Vol. 4 Iss. 1 (2024) – 2 articles

			View Vol. 4 Iss. 1 (2024)
DOI: https://doi.org/10.53623/csue.v4i1
Published: 19 February 2024
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Performance of Grouted Splice Sleeve as A Connection for Wall Panels
by Jen Hua Ling, Ahmad Baharuddin Abd. Rahman, Izni Syahrizal Ibrahim

Civil Sustain. Urban Eng. 2024, 4(1), pp 20-41; https://doi.org/10.53623/csue.v4i1.393

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A grouted sleeve is a mechanical coupler used to join steel bars. It can be used to join precast concrete walls. Most grouted sleeves are pricey proprietary products. This study investigated the behaviour of a grouted sleeve made of steel pipe sections. The grouted sleeve was used as a wall panel connection. The specimens were subjected to three types of loads: tensile, shear, and flexural. The performance of the specimens was evaluated based on the load-displacement responses. For satisfactory bond strength, a bar embedded length of 11 times the bar diameter was required. The grouted sleeve performed well in tension but poorly in shear load. The service shear load was just one-third of the total load capacity. Thus, the grouted sleeve was not recommended for resisting shear load without shear keys to strengthen the joint. Full text


Behaviour of Reinforced Concrete Slabs with Embedded Polystyrene Spheres
by Jen Hua Ling, Ji Wei Lau, Yong Tat Lim

Civil Sustain. Urban Eng. 2024, 4(1), pp 1-19; https://doi.org/10.53623/csue.v4i1.391

46 views
Polystyrene spheres can be used to substitute concrete in reinforced concrete slabs. Despite the weight, the structural performance of the slab would also be affected. This study investigated the behaviour of slabs containing polystyrene spheres under loads. Six specimens were fabricated and tested under the four-point load setup. The parameters studied included the diameters of the polystyrene spheres and the spacing between them. The polystyrene spheres reduced the slabs’ first crack load, stiffness, yield strength, and ultimate strength. The first crack, yield, and ultimate loads decreased by 22.3%, 2.1%, and 4.1%, respectively, when the polystyrene sphere’s diameter increased from 75 mm to 125 mm. As the polystyrene spheres’ spacing decreased from 50 mm to 10 mm, the first crack, yield, and ultimate loads dropped 14.2%, 9.2%, and 7%, respectively. Despite some limitations identified during the feasibility analysis, specimen SP3 was found feasible as a simply supported one-way spanning slab. In the specimen, the polystyrene spheres were 0.625 times the slab thickness in diameter and 2.5 times the concrete cover in spacing. Full text