Effect of Adding High Strength Concrete Topping on Flexural and Shear Behavior of Hollow Core Pre-stressed Slabs | [Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences • 2018]

Author(s):

1. Liaqat Ali Qureshi: Department of Civil Engineering, University of Engineering and Technology Taxila,Pakistan

2. Ali Ajwad: Department of Civil Engineering, University of Management and Technology Lahore,Pakistan

3. Muhammad Ali Khan: Department of Civil Engineering, University of Lahore,Pakistan

4. Gouhar Sultana: Department of Civil Engineering, University of Lahore,Pakistan

5. Muhammad Adil Khan: Department of Civil Engineering, University of Lahore,Pakistan

6. Asjad Javed: Department of Civil Engineering, University of Lahore,Pakistan

7. Ali Aqdas: Department of Civil Engineering, University of Lahore,Pakistan

8. Humaira Kanwal: Department of Civil Engineering, University of Lahore,Pakistan

Abstract:

This paper presents an experimental study regarding the effect of adding extra topping on flexural& shear capacity of hollow core pre-stressed concrete slabsand mainly focuses on how to increase shear and flexural capacity of slabs on site with the help of in-situ concrete topping. There may arise a situation where a depth greater than 200 mm and less than 265 mm may be required due to particular applied loading. Such extra depths can only be produced by applying in-situ concrete topping layer. High strength concrete toppings of 32 mm and 65 mm thicknesses were used on slabs of 200 mm original depth and were also compared with slab of 265mm depth. Out of four topped slabs tested in the program, two were tested under flexure and the other two under shear loading. Two control slabs of 200 and 265 mm but without extra topping were also tested in the same way. The ultimate load capacity, shear capacity, deflection, crack pattern, crack width and modes of failure were investigated for each slab. From the findings, it was concluded that the addition of concrete topping could enhance the flexural and shear capacity of hollow core units. For lfexural loads, the increase was up to sixty percent for 65 mm topping and twenty-three percent for 32 mm topping. For shear testing, the increase was almost hundred percent for 65 mm topping and fifty-six percent for 32 mm topping. It was also observed that both flexural and shear strength of topped slabs was almost equal to the strength of un-topped slabs of same original depth. In cost comparison, the topped up slab came out to be 8.45% expensive as compared to hollow-core slab of similar depth

Page(s): 45-58

DOI: DOI not available

Published: Journal: Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, Volume: 55, Issue: 4, Year: 2018

Keywords:

shear strength , flexural strength , Hollow core prestressed slab , Topping , Cracking , Deflection

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