Self-healing concrete with a microencapsulated …（自修复混凝土与microencapsulatedu2026）.pdfVIP

Self-healing concrete with a microencapsulated healing agent Michelle M. Pelletier,1,2 Richard Brown 2, Arun Shukla 3 and Arijit Bose 1,2 1Laboratory of Soft Colloids Interfaces, 2Department of Chemical Engineering 3Dynamic Photomechanics Laboratory, Department of Mechanical, Industrial and Systems Engineering University of Rhode Island, Kingston, RI, 02881, USA MMP:mpell@, RB: rbrown@, AS: shuklaa@, AB: bosea@ Corresponding Author: Arijit Bose Phone: +1-401-874-2804 Fax: +1-401-874-4689 Email address: bosea@ Keywords: Calcium-silica-hydrate (C-S-H) (B), Microcracking (B), Corrosion (C), Mechanical Properties (C), Self-healing Abstract We have developed a concrete material exhibiting self-healing properties and corrosion inhibition. This system involves a sodium silicate solution stored in polyurethane microcapsules present in the concrete matrix. The sodium silicate, released when the capsules are ruptured by propagating cracks, reacts with the calcium hydroxide in cement and produces a C-S-H gel that partially heals the cracks. Compressive strength is unaffected by the presence of capsules. Samples are stressed to the point of incipient failure in a three-point bend system, and retested after one week. The load at failure in the capsule-containing samples is 26% of the original value, while the samples without capsules displayed a recovery of 10%. The capsule-containing samples displayed ductility, in contrast to brittle failure in the control samples. They also show a significant reduction in corrosion. The flexural strength recovery, the improved toughness and the attenuation of corrosion make it a promising material for construction. 1. Introduction Concrete is the most commonly used