|Table of Contents|

Influence of temperature on mechanical properties and constitutive relationship for polyurethane mixtures(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年4期
Page:
13-28
Research Field:
道路工程
Publishing date:

Info

Title:
Influence of temperature on mechanical properties and constitutive relationship for polyurethane mixtures
Author(s):
SUN Min1; 2;  HUANG Zhao-liang1;  SUN Yan-chao3;  REN Shuai-yu1;  GU Lu-yao1;  BI Yu-feng4
(1. School of Transportation Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China; 2. Postdoctoral Research Workstation, Shandong Hi-Speed Group, Jinan 250099, Shandong, China; 3. Shandong Hengjian Engineering Supervision Consulting Co., Ltd., Weifang 261061, Shandong, China; 4. Innovation Research Institute, Shandong Hi-Speed Group, Jinan 250099, Shandong, China)
Keywords:
pavement engineering;  polyurethane mixture;  uniaxial compression test;  uniaxial tensile test;  mechanical property;  constitutive model
PACS:
U414
DOI:
10.19721/j.cnki.1671-8879.2025.04.002
Abstract:
To investigate the mechanical properties of polyurethane mixtures, using the stone-rich polyurethane concrete(SPC-16 and SPC-25)and suspended dense polyurethane concrete(PC-20)as test subjects, mechanical tests on the uniaxial tensile, uniaxial compression, uniaxial penetration, and dynamic modulus were performed at 20 ℃ and 60 ℃, respectively. The failure processes of specimens were monitored, and the effects of temperature and material type on stress-strain curve characteristics, strength, modulus, and other indicators were analyzed. Furthermore, the uniaxial tensile and compression constitutive models for SPC-16, SPC-25, and PC-20 mixtures at 20 ℃ and 60 ℃ were fitted, respectively. The research results indicate that the compressive strength of polyurethane mixture is 50%-62% that of C40 concrete, while the compressive elastic modulus is only 3%-5%, demonstrating favorable compressive mechanical properties. When the test temperature increases from 20 ℃ to 60 ℃, the peak compressive strain of polyurethane mixture significantly increases, while the peak tensile strain decreases. The uniaxial tensile strength decreases by 40%-50%, the tensile elastic modulus decreases by 4%-30%, the uniaxial compressive strength decreases by approximately 40%, the compressive elastic modulus decreases by 30%-70%, and the uniaxial penetration strength decreases by 15%-35%. The mechanical properties of polyurethane mixture remain stable. At 60 ℃, the uniaxial penetration of polyurethane mixture increases by 30%-80%, the dynamic modulus remains above 3 GPa, while the uniaxial penetrations of two asphalt mixtures are more than doubled in contrast, indicating that polyurethane mixtures exhibit superior high-temperature shear resistance and meet the requirements for high-temperature applications. The phase angles of the three polyurethane mixtures under different loading frequencies are smaller than those of modified asphalt mixtures, highlighting the pronounced elastic characteristics. The fitted constitutive model based on the cement concrete achieves an determination coefficient greater than 0.999, demonstrating a high fitting precision. In conclusion, the research findings provide a theoretical foundation for the promotion and practical engineering application of polyurethane mixtures.2 tabs, 23 figs, 31 refs.

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Last Update: 2025-07-25