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- W2058802389 abstract "The investigation of the mechanical characteristics of expanded polystyrene (EPS) with bulk densities of 15 kg/m3 (EPS15) and 20 kg/m3 (EPS20) under different hydro-thermal conditions is described. In the experiments, the EPS was tested under the expected loading, moisture and temperature conditions defined as representative for sub-base conditions. Firstly, hydro-thermal research on EPS was presented. Water absorption of EPS is stimulated by means of immersion, immersion together with applying a vacuum, and exposing to freeze-thaw cycles. Secondly, determination of the dynamic moduli of elaticity of EPS20 by means of propagation velocity of a wave through a prismatic sample is described. Modulus assessments using the ultrasonic test have been done in order to determine the extent to which this technique could be used for quality purposes. Thirdly, compression tests on cylindrical specimens of EPS15 and EPS20 are discussed. Compression was performed with different strain rates on the specimens with varied moisturre contents to determine the effects, if any, of these test conditions on EPS15 and EPS20 material behaviour. The linear elastic region, evolution of the EPS material modulus and the stress and strain values corresponding to beginning of permanent deformations were determined by result analysis. Fourthly, the EPS samples have been exposed to combined uniaxial static and dynamic loading. The stress levels exceeded the maximum expected values and lead to significant plastic deformations. The purpose was determination of elastic and permanent deformations of EPS15 and EPS20 caused by a wide range of stress levels. Similarly to the compression tests, the experiments on EPS20 were performed at low temperatures too. Finally, the creep in the EPS sub-base is investigated under static stresses which represent dead weights of thin and thick overlaying layers above an EPS subbase." @default.
- W2058802389 created "2016-06-24" @default.
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- W2058802389 date "1997-06-01" @default.
- W2058802389 modified "2023-10-16" @default.
- W2058802389 title "Materials research on EPS20 and EPS15 under representative conditions in pavement structures" @default.
- W2058802389 doi "https://doi.org/10.1016/s0266-1144(97)00011-3" @default.
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