A kind of high toughness concrete and preparation method thereof

Abstract

The invention discloses high-toughness concrete and a preparation method thereof. The formula of the high-toughness concrete comprises 0.2-0.5kg / <m>3 of modified graphene, 150-175kg / <m>3 of water, 395-415kg / <m>3 of cement, 45-60kg / <m>3 of coal ash, 20-35kg / <m>3 of slag powder, 1000-1100 kg / <m>3 of broken stone, 600-700 kg / <m>3 of fine aggregate and 4.5-7 kg / <m>3 of a water reducing agent, wherein the modified graphene is water-soluble grapheme of which the surface has hydroxide radicals; the content of the hydroxide radicals is 0.005-0.012 percent. When the modified grapheme is used for preparing high-toughness concrete, first, the modified grapheme can be dissolved in water to form a graphene water solution; then, the graphene water solution and other concrete preparation materials are uniformly mixed, novel high-toughness concrete obtained after curing can show obvious strain hardening or deformation hardening characteristic under the action of direct tensile load or bending load, and can be applied to bridge floors of high-speed rail viaducts and long-span sea-crossing and river-crossing bridges, and various tunnel arches such as subways. The high-toughness concrete is high in technological content and has relatively good application prospect.

Description

technical field

[0001] The invention belongs to the field of building materials, and in particular relates to a high-toughness concrete and a preparation method thereof. Background technique

[0002] As the most widely used building material in the world today, concrete has the disadvantages of low flexural strength and high brittleness, which leads to cracks or even fractures in concrete, which seriously affects the overall safety and service life of buildings. There are a large number of building structures and parts in modern buildings, such as high-speed railway viaducts, bridge decks of long-span sea-crossing and river-crossing bridges, and various types of tunnel arch walls such as subways. Due to the complex and harsh stress environment, bending strength must be adopted Possibly high high toughness concrete material. In order to improve the toughness of concrete, steel bars were adopted earlier and have been used in large quantities till now. After that, various fib...