Concrete taking industrial waste residues as admixture and preparation method thereof

Abstract

The invention discloses concrete taking industrial waste residues as an admixture and a preparation method thereof. The concrete taking industrial waste residues as an admixture is prepared from the following raw materials in parts by weight: 265-285 parts of cement, 360-400 parts of river sand, 940-970 parts of stones, 160-200 parts of water, 45-55 parts of fly ash, 45-70 parts of slag powder, 380-410 parts of artificial sand, 8-10 parts of an additive and 100-185 parts of modified phosphorus slag powder. The modified phosphorus slag powder comprises the following components: phosphorus slag,a grinding aid, stearic acid, a water reducing agent, water, water glass, aluminum potassium sulfate, sodium sulfate, polyacrylamide, carboxymethyl cellulose, coal gangue and gypsum. The concrete taking industrial waste residues as an admixture has the advantages that the setting time is short, the early strength is high, nitric oxide in automobile exhaust can be adsorbed and degraded, industrialsolid waste is utilized, environmental protection is facilitated, and waste is turned into wealth.

Description

technical field [0001] The invention relates to the technical field of building materials, more specifically, it relates to a concrete with industrial waste residue as an admixture and a preparation method thereof. Background technique [0002] Industrial waste slag refers to the solid waste produced in the process of industrial production, such as slag, fly ash, steel slag, liquid slag, phosphorus slag and copper slag, known as "raw materials in the wrong place". If the industrial waste slag is not used, A large amount of stockpiling not only occupies land resources, but also causes serious air pollution, soil pollution and water resource pollution, endangering the natural environment and human health. On the other hand, most industrial waste residues have usable value and are reusable resources. At present, fly ash and slag are active admixtures that have been widely used, while other industrial wastes are potentially active cementitious materials. For example, the chemica...

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Problems solved by technology

[0004] The existing high-strength anti-cracking concrete is mixed with phosphorus slag powder, although it has good workability, strength and crack resistance, but because phosphorus slag is used as an admixture in concrete, it needs to be ground to a certain level. During the grinding process, the phosphorus slag particles become smaller, the chemical bonds in the phosphorus slag glass will break, and F and P are exposed on the surface of the phosphorus slag particles, and the F atoms are unstable. In the presence of positive charges , it is easy to form F - , F - Ca in cement hydration products 2+ ion action, forming CaF on the surface of phosphorus slag particles 2 , CaF 2 and H in cement hydration products + The ions interact to form hydrogen bonds, so that the phosphorus slag particles are adsorbed to the surface of the hydration product film, resulting in an increase in the density of the film, causing a decrease in the hydration rate, and finally delaying the coagulation time; Stable and readily interacts with surrounding Ca 2+ The ions interact to form a structure similar to calcium phosphate, which absorbs OH in the mixture - , the hydroxyapatite structure is formed on the surface of phosphorus slag particles, which is adsorbed to the surface of the hydration product film, resulting in the obstruction of hydration and retardation. The more phosphorus slag powder is added, the CaF produced 2 And the more hydroxyapatite, the denser the hydration product film, the greater the resistance, resulting in the extension of the setting time, and the extension of the setting time will affect the early strength of concrete, making the early strength of concrete lower

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