Self-Healing of SMA and Steel-Reinforced Mortar with Microcapsules

被引：7

作者：

Arce, Gabriel A. ^{[1
]}

Hassan, Marwa M. ^{[1
]}

Mohammad, Louay N. ^{[2
,3
]}

Rupnow, Tyson ^{[4
]}

机构：

[1] Louisiana State Univ, Dept Construct Management, Baton Rouge, LA 70803 USA

[2] Louisiana State Univ, Dept Civil & Environm Engn, Baton Rouge, LA 70803 USA

[3] Louisiana Transportat Res Ctr, Engn Mat Characterizat Res Facil, 4101 Gourrier Ave, Baton Rouge, LA 70808 USA

[4] Louisiana Transportat Res Ctr, 4101 Gourrier Ave, Baton Rouge, LA 70808 USA

来源：

JOURNAL OF MATERIALS IN CIVIL ENGINEERING | 2019年 / 31卷 / 02期

基金：

新加坡国家研究基金会;

关键词：

ENGINEERED CEMENTITIOUS COMPOSITE; CALCIUM NITRATE; CONCRETE;

D O I：

10.1061/(ASCE)MT.1943-5533.0002568

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Healing capabilities of shape-memory alloys (SMAs) and steel-reinforced mortar with self-healing microcapsules were investigated. Small cracks ranging from 13 to 152m were induced by three-point bending, and specimens were subjected to a 14-day healing period under water-submerged conditions at 55 degrees C +/- 5 degrees C to induce shape-memory effect activation. Light microscopy investigation was performed at 3, 7, and 14days of the healing period. Moreover, healing products were investigated using scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). Healing efficiency improvements with the increase in microcapsule content were reported at 3 and 7days for steel-reinforced specimens. Furthermore, for all mortar mixes evaluated, SMA-reinforced specimens exhibited a superior healing performance than steel-reinforced specimens at 3days of healing due the crack-closing action of SMA. The overwhelming majority of healing products were identified as likely calcite crystals, and the limited gellike products also present were presumably calcium silicate hydrate (C S H).

引用

页数：10

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