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Abstract
Lightweight concrete (LWC) is of high importance to the construction industry that is cost effective and highly advantageous. A new kind of LWC was produced, which combines the advantages of normal density concrete, cellular concrete and high workability concrete through partially replacing the normal weight aggregates with polystyrene foam particles. This leads to concrete’s unit weight reduction while maintaining adequate strength. The latter material can therefore be produced using standard methods familiar to the construction industry with a dry unit weight of 18.50 kN/m3 , which in turn leads to self weight reduction by 15 – 20 % and the associated decrease in the structure’s overall cost, hence, providing a feasible challenge to normal weight concrete (NWC).
The main objective of this study was to examine the bond behavior of structural LWC with steel rebars. The investigation focused on studying the bond of deformed, straight, unanchored steel rebars in flexural members and examining the applicability of reliable and accurate descriptive equations to LWC. These equations were deduced from the available design expressions in codes and available international bond models.
The experimental program incorporated two phases. The first phase was performed on the standard pull-out specimens to compare the results with the commonly conducted bond testing and to abstract the bond-slip curve of the standard pull-out test specimens. The second phase deal with a deduced reduced beam-end specimen to assess the behavior of bond between reinforcing bars and concrete in flexure members. In this regard, twenty four pull-out specimens and eight beam-end specimens were prepared and tested. For pull-out specimens; the parameters conside