2 results about "Flexural toughness" patented technology

This application belongs to the field of ultra-high performance concrete (UHPC) technology, specifically providing a toughened and reinforced UHPC functional component and its preparation method. The preparation method of the toughened and reinforced UHPC functional component includes the following steps: a mixed slurry is prepared from a UHPC matrix and modified steel fibers, poured into a mold, allowed to stand, and then steam-cured after demolding. The preparation method of the modified steel fibers includes: first activating the steel fibers with a hydroperoxide solution, then modifying the activated steel fibers with aminosilane, and finally reacting the silanized steel fibers sequentially with acrylate and amine compounds. By constructing a high-density amino group and a large number of branched structures on the surface of the steel fibers, the bonding strength between the modified steel fibers and the UHPC matrix is ​​improved, and interfacial debonding is reduced, thereby improving the interfacial strength, flexural toughness, and impact resistance of the toughened and reinforced UHPC functional component.

This invention belongs to the technical fields of infrastructure construction, urban renewal, seismic reinforcement, and infrastructure improvement in cold regions, and discloses a low-fiber-content, high-toughness self-prestressed concrete. It achieves the dual goals of high toughness and crack-free service life in low-fiber-content concrete by controlling the volume deformation of a highly efficient expansion component. This invention controls the mass fraction (25 parts / 2000 parts - 45 parts / 2000 parts) and particle size (1 μm - 80 μm) of the highly efficient expansion component, and cures it with water for at least 3 days. The volume of the expanded highly efficient expansion component accounts for 2.5% - 4.5% of the total volume; thus, an equivalent flexural toughness of not less than 160 kJ / m is achieved with a low fiber volume content. 3 It achieves the goal of low cost and high toughness with a flexural strength of not less than 12 MPa. It has broad prospects in infrastructure construction, urban renewal, hydraulic structures, seismic reinforcement, and especially in upgrading infrastructure in cold regions.