Experimental Investigation on the Bond Behavior of Deformed Bars in a Class of Structural Expanded Polystyrene (EPS) Con
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-0167-2
Structural Engineering
Experimental Investigation on the Bond Behavior of Deformed Bars in a Class of Structural Expanded Polystyrene (EPS) Concrete Chao Lia, Linchang Miaoa , Quan Youa, Lijian Leia , Xiaodong Lianga, and Junjie Wanga School of Transportation, Southeast University, Nanjing 211189, China
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ARTICLE HISTORY
ABSTRACT
Received 4 February 2020 Revised 25 March 2020 Accepted 12 July 2020 Published Online 17 September 2020
The structural expanded polystyrene (EPS) concrete (above 35 MPa) has the potential to be used as metro track bed to reduce and isolate vibration, but its bond behavior is still unclear. This inhibits its application because it is often used in combination with reinforcing bar. In this paper, a class of structural EPS concrete (above 35 MPa) was developed. Based on this, a series of pull-out tests were conducted and the bond behavior of deformed bars in these structural EPS concretes was investigated. In addition, effects of rebar bond length and rebar diameter were analyzed in detail. Experimental results indicate that the structural EPS concrete suffers splitting failure more easily than the conventional concrete (CC). Increase of EPS replacement, rebar bond length or rebar diameter tends to cause the splitting failure of structural EPS concrete. Moreover, with increase of EPS replacement, the failure process is less explosive and more gradual. The stress-slip relationships of the most specimens show three stages, namely linear ascending, non-linear progression, and descending stages. The bond strength of structural EPS concrete is found depended linearly on the power function of its compressive strength, relative cover thickness (c/d) and relative rebar bond length (L/d), respectively. Accordingly, a bond strength prediction model was formulated, and it can precisely predict the bond strength of deformed bars in structural EPS concrete, specimens failing in splitting or splitting-pull out modes, and no fiber added. The results can provide reference for the design of structural EPS concrete.
KEYWORDS Bond behavior Structural EPS concrete Deformed bars Pull-out test
1. Introduction Expanded polystyrene (EPS) concrete is a type of artificial lightweight aggregate concrete (LWC), consisting of cement, sand, aggregates, EPS particles, etc. (Cook, 1973; Miled et al., 2004). In general, it can be obtained by partially or totally replacing standard aggregates with EPS particles (Kava and Kar, 2016). Comparing with conventional concrete (CC), the EPS concrete shows many distinguished advantages, and it can be used in many engineering fields such as building engineering, military engineering, marine engineering, road engineering, etc. (Miled et al., 2004; Babu et al., 2006; Tang et al., 2008a; Ranjbar and Mousavi, 2015; Shi et al., 2016; Lu et al., 2017; Mohajerani et al., 2017). When utilized as structural elements, the EPS concrete is characterized of low-density, reduced dead weight and reduced st
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