Abstract
Foamed concrete is a type of cellular concrete with excellent properties of impact attenuation and energy absorption. This study investigates the mechanical and energy absorption properties of foamed concrete. The relationship between elastic modulus and relative density of foamed concrete was exploited at one-dimension strain compressive loading condition, and a shape function was applied to describe the constitutive equation of the foamed concrete. In this study one-dimension strain compressive testing method was employed. Based on stress strain curve and constitutive equation, yield stress, plateau stress, densification strain and energy absorption efficiency of foamed concrete were obtained, and the energy absorption property was also analyzed. This study can support the applications of foamed concrete in structural protection.
Highlights
Foamed concrete is a type of cellular materials with lower strength(Weigler & Karl, 1980; Jones & Mccarthy, 2005), acoustic insulation, freeze-thaw resistance(Tikalsky, Pospisil & Macdonald, 2004)and high-impact resistance(Zollo & Hays, 1998)
The results indicate that the strength and elastic modulus would decrease, whereas the strain(or compressibility) would increases with increase of porosity of foamed concrete
Mechanical behaviour and properties of foamed concrete are important issues for correct understanding its characteristic of mitigating blast loads in defense engineering
Summary
Foamed concrete is a type of cellular materials with lower strength(Weigler & Karl, 1980; Jones & Mccarthy, 2005), acoustic insulation, freeze-thaw resistance(Tikalsky, Pospisil & Macdonald, 2004)and high-impact resistance(Zollo & Hays, 1998). Foamed concrete can be designed to have any density in range of 170–1600 kg/m3, and it is widely used as structure materials in civil engineering field Sometimes they are applied in defense engineering as core materials of protective structure against impact or blast loads. The behaviour of foamed concrete under confined compression was studied by other researchers(Zollo & Hays, 1998), and the stress-strain curves up to the fracture points of foamed concrete were addressed. The typical stress-strain curve of cellular material under compressive loading condition can be divided into three regimes, namely elastic regime, plateau regime and densification regime, as illustrated in Fig 2 (Mohd, Mujahid, Zaidi & Ismail, 2010). Employed, which was once utilized by seldom other researchers (Zollo & Hays, 1998; Xiong, 2008; Luo, 2011; Liu, Zhao, Wang & Ren, 2007)
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