|About this Abstract
||MS&T21: Materials Science & Technology
||Late News Poster Session
||P2-10: Correlation between Shear Strength and PU Foam Density with Respect to Aging Time in District Heating Pipe
||Hyung-Gyu Kim, Jaehoon Park, Jooyong Kim, Hae-Yong Lee, Jonghun Yoon
|On-Site Speaker (Planned)
The shear strength of 0.12MPa or more and the shear strength in aged condition shall be minimum 45% of the shear strength in unaged condition, in order to determine whether the aged DH(District Heating) pipe can be used continuously based on EN253. However, in general DH pipes, it is inevitable to have an uneven distribution of shear strength because PU(Polyurethane) foam cannot be uniformly foamed during production. It was experimentally confirmed that different shear strengths were measured according to the longitudinal direction in the DH pipe, and the correlation between density and shear strength was derived by measuring the density at each location. In addition, there was little change in density after accelerated aging by applying a high temperature condition, and it was possible to predict the initial shear strength by measuring the density. This research is expected that the accuracy of the residual life prediction can be improved.