Development and recovery of mechanical properties of self-healing cementitious composites with MgO expansive agent

被引：50

作者：

Sherir, Mohamed A. A. ^{[1
]}

Hossain, Khandaker M. A. ^{[1
]}

Lachemi, Mohamed ^{[1
]}

机构：

[1] Ryerson Univ, Dept Civil Engn, 350 Victoria St, Toronto, ON M5B 2K3, Canada

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2017年 / 148卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Engineered cementitious composite; Self-healing system; MgO expansive agent; Supplementary cementing materials; Compressive strength; Flexural strength; UPV; Crack healing; Strength recovery; Repeated; CAPABILITY; CONCRETE; REPAIR;

D O I：

10.1016/j.conbuildmat.2017.05.063

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper presents the performance of engineered cementitious composites (ECCs) produced with MgO utilized as expansive self-healing agent to heal micro cracks. ECCs capability to keep small crack width of less than 60 gm even under ultimate loads can stimulate the autogenous crack healing and thus, improving the mechanical properties of structural elements. Different test schemes were adopted to quantify the long-term self-healing capability of proposed ECC-MgO system (made of 5% MgO expansive agent 'MEA' as fly ash replacement in ECC matrix) through studying the development and recovery of strength (compressive and flexural) and Ultrasonic Pulse Velocity (UPV) of pre-loaded multiple damaged (cracked) cubic and prismatic specimens subjected to long term water and natural curing conditions. Test results indicated that preloaded cracked ECC-MgO specimens had high tendency to recover original mechanical properties of virgin (un-cracked) specimens through healing of micro-cracks. This study confirmed the self-healing capability of proposed ECC-MgO system. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：789 / 810

页数：22

共 28 条

[1]

[Anonymous], 2016, STANDARD TEST METHOD, P1, DOI [10.1520/E0384-17, DOI 10.1520/C0039, 10.1520/C0039_C0039M-21]

[2] Procedures developed for self-repair of polymer matrix composite materials [J].

Dry, C .

COMPOSITE STRUCTURES, 1996, 35 (03) :263-269

[3]

Dry C., 1994, SMART MATER STRUCT, V3, P118, DOI 10.1088/0964-1726/3/2/006

[4] Three designs for the internal release of sealants, adhesives, and waterproofing chemicals into concrete to reduce permeability [J].

Dry, CM .

CEMENT AND CONCRETE RESEARCH, 2000, 30 (12) :1969-1977

[5]

Du C., 2005, Concrete international, V27, P45, DOI DOI 10.1080/19475705.2020.1861113

[6]

Edvardsen C, 1999, ACI MATER J, V96, P448

[7] Production of MgO-type expansive agent in dam concrete by use of industrial by-products [J].

Gao, Peiwei ;

Lu, Xiaolin ;

Geng, Fei ;

Li, Xiaoyan ;

Hou, He ;

Lin, Hui ;

Shi, Nannan .

BUILDING AND ENVIRONMENT, 2008, 43 (04) :453-457

[8]

Ghosh S.K., 2009, Self-healing Materials: Fundamentals, Design Strategies, and Applications, P291

[9]

Helmuth R, 1998, CEMENT CONCRETE AGGR, V20, P194

[10] Self-Healing of Microcracks in Engineered Cementitious Composites (ECC) Under a Natural Environment [J].

Herbert, Emily N. ;

Li, Victor C. .

MATERIALS, 2013, 6 (07) :2831-2845

← 1 2 3 →