High-strength ultra-high-toughness concrete and preparation method thereof

Abstract

The invention relates to high-strength ultra-high-toughness concrete and a preparation method thereof. The concrete is prepared from, by weight, 400-800 parts of cement, 100-250 parts of silica fume, 200-500 parts of slag powder, 200-500 parts of fly ash, 200-500 parts of quartz powder, 800-1,000 parts of quartz sand, 20-40 parts of a water reducing agent, 180-250 parts of water and 15-25 parts of polyethylene fibers. When the concrete is prepared, the cement, the silica fume, the slag powder, the fly ash, the quartz powder and the quartz sand are added into a stirrer by weight, and the dry powder is stirred for 2-3 min and fully mixed to be uniform; after stirring is finished, the mixed dry powder is transferred into a mold, vibrating is conducted for 1-2 min for molding, curing and demolding are conducted, and then the high-strength ultra-high-toughness concrete is prepared. Compared with the prior art, the concrete has the advantages that the compressive strength reaches 120-150 MPa, the breaking strength reaches 30-50 MPa, the tensile strength reaches 15-22 MPa, and the tensile elongation reaches 4%-8% and has the very good application prospect.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a high-strength and ultra-high-toughness concrete and a preparation method thereof. Background technique [0002] Ultra high performance concrete (UHPC for short) has the characteristics of high specific strength, large load capacity, resource and energy saving, and excellent durability. It can meet the requirements of lightweight, high-rise, long-span and high durability in civil engineering It is the main development direction of concrete technology. UHPC was developed by French researchers using conventional materials in the 1990s with ultra-high compressive strength, ultra-high tensile strength, high toughness and high durability. UHPC materials are based on the principle of the closest packing, using a high-density cement-based uniform system model, removing coarse aggregates above 2mm, and adding a certain volume of micro-steel fibers together with high temperatur...

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Problems solved by technology

[0006] The object of the present invention is to provide a high-strength and ultra-high-strength composite material with high compressive strength, high tensile strength, high ductility, good energy dissipation capacity and elastic modulus in order to overcome the defects of the above-mentioned prior art. Ductile concrete and its preparation method aim to solve the technical problem that existing cement-based materials cannot have both high strength and high ductility

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