EFFECTS OF DIFFERENT TYPES OF CONCRETE TOPPINGS ON THE BEHAVIOR OF PPHC SLABS

Nabil, A.; Meleka, N.; Heiza, Kh.

doi:10.21608/erjm.2017.66359

EFFECTS OF DIFFERENT TYPES OF CONCRETE TOPPINGS ON THE BEHAVIOR OF PPHC SLABS

Document Type : Original Article

Authors

¹ PhD Candidate at Department of Civil Engineering, Faculty of Engineering, Menoufia University, Egypt

² Professor of Reinforced Concrete Structures at Department of Civil Engineering, Faculty of Engineering, Menoufia University, Egypt

³ Professor of Reinforced Concrete Structures and Vice Dean for Community Services and Environmental Development at Faculty of Engineering, Menoufia University, Egypt

10.21608/erjm.2017.66359

Abstract

Usage of precast prestressed concrete hollow core (PPHC) slabs has been extensively spread out in roofing and flooring systems around the globe due to benefits of mass production and fast site construction. In this flooring system, prestressed precast hollow core slabs are used together with or without a cast in place concrete topping. A few research works focused on studying the effect of using concrete topping on enhancement of the structural integrity of the PPHC system. This paper presents an experimental study conducted to investigate the effects of using different types of cast in place (CIP) concrete toppings on the behavior of PPHC slabs. Ten typical full scale specimens of PPHC slabs were prepared in precast concrete plant under quality control program; specimens were classified into five groups. Group (1) includes two control specimens without topping, Group (2) contains two specimens with ordinary reinforced concrete topping, Group (3) involves two specimens with ordinary reinforced concrete topping connected to the top surface of the slab using steel anchors, Group (4) comprises two specimens with fibrous concrete topping, and finally Group (5) includes two specimens with ferrocement topping. All test specimens were tested under static line loading until failure. Cracking patterns, failure modes, cracking and ultimate failure moment capacities, and moment- deflection relationship have been illustrated, discussed, and analyzed in this study. Adding concrete topping to the PPHC slabs enhances flexural behavior directly under static line loading, as the cracking moment resistance was increased by about 6% to 31% and failure moment was increased by about 11% to 41% by using concrete toppings

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