International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
EXPERIMENTAL BEHAVIOUR OF PRESTRESS HOLLOW CORE SLAB, RC HOLLOW CORE SLAB AND NORMAL RC SOLID SLAB K.M.MONISHA[1], G.SRINIVASAN[2] Post Graduate, Department of Civil Engineering, EBET group of institution, Tirupur, Tamilnadu, India. Associate professor, Department of Civil Engineering, EBET group of institution, Tirupur, Tamilnadu, India. 1.
2.
-------------------------------------------------------------------***-----------------------------------------------------------1.2 Advantages Of Hollow Core Slab. ABSTRACT - The project consists of comparative studies on structural behaviour of prestress hollow core slab and RC slabs. The project consists of experimental behaviour of hollow core slabs and comparison of this result with different mix and casting. Reinforced hollow slab is casting by making the hole in mould. Then the prestress hollow core slab is casted with zero slump concrete in factory. The slab has the dimension of 1m3. The load test is done in these slabs by loading frame. These papers include design and experimental test of normal reinforced solid slab, reinforced hollow core slab and prestressed hollow core slab. Final result will be compared between these three slabs by load test.
Key words: Prestress, hollow core slab, solid slab, cracking pattern, ultimate load.
1. INTRODUCTION A hollow core slab, also called as a voided slab, hollow core plank or simply a concrete plank is a precast slab of prestressed concrete typically used in the construction of floors in multi-story apartment building. The slab has been popular in present modern construction. The precast concrete slab has tubular voids extending the full length of the slab. This holes makes the slab much lighter than a reinforced solid concrete slab of equal thickness or strength. The reduced weight is important because it lowers the costs of transportation as well as material (concrete) costs.
1.1 Hollow Core Slabs
Hollow core slabs are precast, prestressed concrete elements that are generally used for flooring. A hollow core slab is consist of continuous voids provided to reduce weight and cost. This hollow core slabs are primarily used as a floor deck system in residential and commercial buildings as well as in parking structures because this slabs are more economical, have good fire resistance and sound insulation properties, and also capable of spanning long distances with relatively small depths.
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The slabs have between four and six longitudinal holes running through the slab, the primary purpose of the holes being to reduce the weight, and material within the floor. To increase the strength of the hollow core slab, the slabs are reinforced with 12mm diameter steel strand, running longitudinally. Currently we offer a range of five slab depths; 200, 220, 300, 320 and 400 millimetre slabs. Depending on the project requirements, in particular span and particular slab depth is chosen. The long horrow cores (voids) can be used to run mechanical and electrial equipment. The long span capabilities in hollow-core slab provides long and clear spans, opening interior spaces in projects and allows designers to maximize functional layouts. The high-strength hollow-core slabs can provide floors that support heavy loads. Especially tall buildings that use hollow-core slabs have less vibration than conventional allow, along with a strong acoustical performance. Hollow-core slabs are most helpful in meeting the requirement of separating parking and other functional areas of the mixed-usage facility. Hollow-core slabs act as a ceiling and flooring unit and reduces the building height while saving the cost. The ducts in the Hollow-core slabs can save material and time by eliminating ductwork. The Hollow-core slab can also be used as vertical or horizontal wall panels.
1.3 Disadvantage
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Does not incorporate well into a timber framed house. Only small openings can be made (10 inches or less) in the hollow core slabs at erection sites. All other openings must be shown on the approved shop drawings and cut at the factory.
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