Method and pavement structure for protecting highway subgrade in frozen soil area

US8303211B2 · kind B2 · utility

Assignees

• CCCC FIRST HIGHWAY CONSULTANTS CO., LTD. · CN
• SOUTHEAST UNIVERSITY · CN

Inventors

• Shuangjie Wang · Xi'an, CN
• Shengyue Wang · Nanjing, CN
• Jianbing Chen · Wayland, US
• Xiaofeng Zhou · Shanghai, CN
• Juan Zhang · San Diego, US
• Qiyang Zhu · Nanjing, CN

Key dates

• Filing date: Dec 31, 2009
• Grant date: Nov 6, 2012
• Expiry date: Apr 5, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/29
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention provides a method and pavement structure for protecting highway subgrade in frozen soil areas. The pavement structure has two or more pavement layers having gradient thermal conductivity; the thermal conductivity is layered among the pavement layers and is lowered from top to bottom, so that the pavement forms a uni-directional thermal conducting tunnel from the subgrade to the air. Heat can be easily released from the subgrade into the air, and is prevented from being transferred from the air to the subgrade. In this way, the frozen soil layer beneath the subgrade is cooled, so that the frozen soil table is made stable, and the highway subgrade in frozen soil areas is protected.