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首页> 美国政府科技报告 >Shape Memory Polymer Based Self-Healing Sealant for Expansion Joint.
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Shape Memory Polymer Based Self-Healing Sealant for Expansion Joint.

机译：基于形状记忆聚合物的膨胀接头自修复密封胶。

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摘要

Failure of expansion joints is a leading cause of damage to bridge superstructures and concrete pavements. Failure of sealant material facilitates decay of the structure beneath it. The objective of this study is to develop a novel shape memory polymer (SMP) based smart sealant to solve a couple of critical problems facing compression-sealed joint: building-up of compressive stress and sealant squeezing out of the channel. By programming SMP in 2-D stress condition (compression in horizontal or traffic direction and tension in vertical direction) and by controlling the transition temperature of the SMP below the highest temperature of the environment to be experienced, the accumulated compressive stress can be significantly released due to the two orders of drop in the stiffness of the SMP at temperature above its transition temperature; consequently, the concrete and the sealant may not be crushed. Simultaneously, the squeezing-out problem may also be eliminated due to shrinkage of the sealant in the vertical direction when the sealant recovers (shape memory effect), which is seemingly against the physics because it contracts when temperature rises. In this study, a two-dimensional programming device was designed and fabricated, and shape fixity and shape recovery ratios of SMP and its syntactic foam were determined. Laboratory-scale performance evaluation of the developed syntactic foam as a smart sealant for bridge deck and concrete pavement joints was conducted, including uniaxial compression, tension and shear tests, cyclic loading tests, water immersion tests, and functional stability tests under ultraviolent radiation. The feasibility of using two-step 1-D programming to replace one-step 2-D programming was established. Shape memory polymer based sealant was fabricated, programmed, and installed in two expansion joints at the Louisiana State University campus in January 2012.

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