Functional Mechanism And Experimental Research Of Self-Repairing Concrete

Self-repairing concrete imitate the regenerationand renew mechanism of the bonestructure, and it can be looked upon as a type of composite material which is made upof concrete and adhesive. Such composite material has self-repairing and regenerationfunction when the material encounters some scathe, it can renew or even enhance theperformance of the material. In this paper, the mechanism of self-repairing concrete isresearched, and the self-compacting concrete is chosen as the basal material ofself-repairing concrete. The experimental researches about the mechanics performanceof self-repairing concrete with embedded short glass tubes and embedded long glasstubes are carried out, furthermore, the experimental researches about the repair effect ofreinforced concrete bending members with different adhesive is also carried out. Wecarried out researchful work as follows: Firstly, based on the functional mechanism of self-repairing concrete, we makecertain that the adhesive with single-composing idiosyncrasy is fit for the self-repairingconcrete. Then the neoprene adhesive,polyester adhesive and α-cyanoacrylateadhesive are chosen as the adhesive. Secondly, based upon the functional mechanics property, chemistry property andcalorifics property of glass, the short glass tube is chosen as repair capsule in theconcrete with crack self-repairing performance using embedded capsules filled withadhesive and the long glass tube is chosen as repair fiber in the concrete with crackself-repairing performance using embedded fibers filled with adhesive. Thirdly, based on the fiber mechanics of complex materials and the theory of fiberdistance, the functional mechanism of the short glass tubes that embedded in theconcrete is studied. And then using the cracking calculate principle ofreinforce-concrete, we also deduce the proper size of repair fibers from equilibriumcondition of differential calculus element. Once the concrete cracks, the repair fiberstake effects on time. Fourthly, the length, diameter and mingled volumes of repair capsules have IIimportant influence on the mechanics property and repair effect of concrete, so,concrete specimenmixed with different length, different diameter and different mingledvolumes of repair capsules are compared with the specimenthat have no capsules. Thuswe can educe the proper geometryparameter and proper mingled volume of capsules. Fifthly, to determine the appropriate thickness of the short glass tube's wall, themodel of repair capsules is set up and analyzed using finite element method withABAQUS. In the end, self-compacting concrete is chosen as the basal material, and theembedded long glass tubes are filled with neoprene adhesive, polyester adhesive andα -cyanoacrylate adhesive respectively, then the self-compacting concrete simplysupported beams with crack self-repairing performance using embedded long glass tubesfilled with adhesive are experimentalized at third-point bending, and the repairingeffect of the three type of adhesive and the difference about the renew and increaseperformance of the bending members'loading capacity among different number ofembedded long glass tubes are compared.