发泡聚苯乙烯(EPS)在蠕变的长期调查时间应变压缩永久荷载下的强度与变形特性稳定.pdfVIP

ISSN 1392–1320 MATERIALS SCIENCE (MEDŽIAGOTYRA). Vol. 19, No. 2. 2013 Stability of Strength and Deformation Characteristics of Expanded Polystyrene (EPS) within the Time of Long-Term Investigation of Creep Strain under Permanent Compressive Loading ∗ Saulius VAITKUS , Ivan GNIP, Sigitas VĖJELIS Scientific Institute of Thermal Insulation of Vilnius Gediminas Technical University, Linkmenu st. 28, 08217 Vilnius, Lithuania /10.5755/j01.ms.19.2.4442 Received 18 July 2011; accepted 19 October 2011 The results of investigation of strength (σ , σ ) and deformability (E) characteristics of expanded polystyrene 10 % cr specimens are presented. The results are based on the short-term compression in the organization of long-term creep study. For the experiments identical specimens stored 5 years at ambient temperature (23 ±2) °C and relative humidity (50 ±5) % as well specimens after removal long-term loading were used. There were established, that difference between experimental values of stress and initial modulus of tested expanded polystyrene specimens with confidence probability P = 90 % (on-sided test) is negligible (random). Keywords : expanded polystyrene slabs (EPS), short-term compression, aging, long-term compression. 1. INTRODUCTION∗ It should be noted that information about the degree of stability of strength and strain characteristics of EPS in Expanded polystyrene (E