Control of Cracking in Precast, Prestressed Concrete Panels for Bridge Decks

Kwon, Ki Yeon; Foreman, James; Azimov, Umid; Klingner, Richard E.; Bayrak, Oguzhan; Jirsa, James O.

doi:10.14359/51687164

Cited by 6 publications

(2 citation statements)

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“…If the blocks differ in height or are not aligned vertically, bending stresses are introduced in the panels and may cause cracking. Cracks can also be caused if panels are stacked on uneven ground, or if the straps holding stacks of panels to a truck bed are improperly placed and tightened [11].…”

Section: Occurrence Of Crack In Precast Concretementioning

confidence: 99%

Untitled

2019

IJUR

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The Industrial Building System (IBS) technique does bring advantages such as reducing wastage and cost, time and enhance quality. However, regardless of IBS's advantages, it does have some critics, especially when it involves gross error on human interference that lead to unsafe acts. Too many machinery also can cause hazards to workers. These weakness lead to misperception of IBS in construction society, especially when it resulting to product defects. This research is aiming for defect control by minimising material handling and human interference in the storage and transportation of precast components. Thus, a self-loading suspension rack (SLSR) model is proposed to chattered the issues. SLSR shall be created by merging the concept of suspension system with the innovation of automation moving rack. Construction sequences, production storage and delivery process, are therefore important and need to be closely monitored to prevent costly double handling such as rectification work in site progress or re-costing for product returned. A control from the manufacturing phase is significant for overall productivity and performance of the precast plant.

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Section: Occurrence Of Crack In Precast Concretementioning

confidence: 99%

Untitled

2019

IJUR

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“…However, the existing PC composite slabs still have some flaws that may prevent PC composite slabs from being applied in the engineering practice, such as the low prefabrication rate, the large workload of on-site construction, the low installation rigidity, the complex onsite construction technology, and the tensile crack at upper post-pouring layer due to differential shrinkage between precast plank and post-pouring concrete layer. 12,13 More notably, according to relevant research, 14 the transverse superposed surface has adverse impacts on the flexural performance of PC composite slabs, and the position of this surface is one of the main factors that affect the mechanical properties. As the position of the transverse superposed surface gradually approaches the section with relatively large bending moment, the adverse impacts gradually increase.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on flexural behavior of a novel variable‐grade prefabricated concrete slab with surrounding composited

Liao

2022

Structural Concrete

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This paper investigates a novel variable-grade prefabricated concrete (PC) slab with surrounding composited which has high prefabrication rate, sufficient installation rigidity, high on-site construction efficiency, and good overall working performance. To improve the crack-resistance performance of the transverse superposed surface and the overall working performance of the proposed novel PC slab, we optimize the position of variable-grade and arrange it at the location where the bending moment is close to zero. We perform comparatively bending tests on three two-span full-scale slab strips that include boundary and intermediate beam-slab joints to systematically investigate the flexural behavior of the proposed novel slab. The load versus deflection relationship, failure mode, distribution of cracks, development law of crack width and development of steel strain are comparatively studied. The test results confirm that the flexural behavior of the proposed novel PC slabs are similar and slightly better than that of the cast-in-place slab in general. No crack or slippage appears at the interface between the precast panel and the post-pouring concrete. The connection method of L-shaped anchorage rebars lap splicing in this study is cost-effective, efficient, and reliable. Furthermore, we establish a finite element model and perform a parametric investigation on the proposed novel PC slab. Parametric simulations conclude that the increase of the strength of post-pouring concrete and post-pouring layer thickness can improve the bearing capacity of the proposed novel PC slabs.

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