Abstract: Considering two factors of the polystyrene particle content and wet density， 25 groups of foamed particles concrete with different proportions were prepared. The strain rate effect is not obvious by studying the loading speed on stress-strain curve of foamed particles concrete. The effect of different polystyrene particles content and different wet density on stress-strain curve of foamed particles concrete was also studied. The results show that the influence of polystyrene particles content and wet density on mechanical properties was obvious. Through the analysis of modulus of elasticity， crushing stress， crushing strain and other parameters， combining with test results， a phenomenological uniaxial compressive constitutive model of foamed particles concrete is established. Comparing test results with modeling predictions， good agreements are obtained between the phenomenological constitutive model and test results.

Key words: foamed particles concrete, modulus of elasticity, crushing stress, crushing strain, phenomenological constitutive model