Deformations of High-Strength Lightweight Concrete Having Hollow Microspheres and Method of Reduce Them

The paper presents the researching results of deformation properties of the high-strength lightweight concrete with hollow microspheres. The method of increasing the fracture toughness of high-strength lightweight concrete with aluminosilicate microspheres by using the modifier as a coupling agent on the surface of the microparticles of aggregate is proposed. The hollow microspheres are perspective filler for lightweight concrete with high performance characteristics; the increasing of content of the spherical microparticles in the concrete composition promotes to forming close-packed structure with low deformations. The coefficient of fracture toughness of the high-strength lightweight concrete is comparable with the same parameter for fine-grained high-strength heavy concrete (more than 0.1) and is limited by strength characteristics of micrometric particles of aggregate. It is to create the active iron-silica shell on the surface of the hollow filler, which interacts with the major components and products of the cement hydration and reinforces the phase boundary. The proposed method of modifying allows to reduce the longitudinal and transverse deformations of the high-strength lightweight concrete at 7–12% and 8.5–16.5% respectively. The elastic modulus of the high-strength lightweight concrete is 6–8.5 GPa, and Poisson’s ratio is 0.08–0.14. The nanomodifier reduces the intensity of the cracking under the influence of shrinkage stresses of high-strength lightweight concrete by 56.9%.

A.S. INOZEMTCEV, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
E.V. KOROLEV, Doctor of Sciences (Engineering), director, research and educational center «Nanomaterials and Nanotechnology»

Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation)

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