The study on compressive mechanical properties of rigid polyurethane grout materials with different densities

• Published in: Construction & building materials 2019-05, Vol.206, p.270-278
• Main Authors: Liu, Kai, Liang, Wei, Ren, Fengmei, Ren, Jingge, Wang, Fang, Ding, Heng
• Format: Article
• Language: English
• Subjects: Compressive behavior; Different density; Loading rate; Rigid polyurethane foam
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2019.02.012

•The grout materials with different densities show elastoplastic or atypical brittle characteristic.•These elastoplastic and atypical brittle characteristics were explained on the micro scale.•Two integral models were proposed to quantify the different mechanical characteristics.•Two simplified integral models were proposed to make models easy to be applied. The rigid polyurethane grout materials with different densities show elastoplastic or atypical brittle characteristic, which will significantly affect their performance. To clarify these mechanical characteristics of polyurethane foams with different densities, uniaxial compression tests and SEM experiments were carried out. To further describe these different mechanical characteristics quantitatively, two integral models based on superposition and segmentation methods were proposed, respectively. Moreover, two simplified integral models were developed to make models easy to be applied. Through error analysis, it is found that the average errors of integral models are less than 0.02 MPa and the average errors of simplified integral models are less than 0.035 MPa. The integral models are accurate while the parameters of simplified integral models are less.