Dry-mixed composite light aggregate concrete based on inorganically modified polyurethane particles

Abstract

The invention relates to dry-mixed composite light aggregate concrete based on inorganically modified polyurethane particles and a preparation method of the dry-mixed composite light aggregate concrete. The concrete is prepared from raw materials in parts by weight as follows: 38-135 parts of the inorganically modified polyurethane particles, 162-485 parts of cement, 30-127 parts of fly ash, 23-50parts of mineral powder, 3-50 parts of silica fume, 37-740 parts of dry sand, 4.6-19.7 parts of an admixture and 105-380 parts of water. The preparation method comprises the following steps: 1, wastepolyurethane particles are subjected to grain size grading; 2, the graded waste polyurethane particles are inorganically modified; 3, the cement, the fly ash, the silica fume, the mineral powder andthe admixture are added to a dry powder stirrer for uniform stirring and mixing, and dry-mixed composite powder is obtained; 4, the dry-mixed composite powder is mixed with the inorganically modifiedpolyurethane particles, water is added for stirring, and the dry-mixed composite light aggregate concrete is prepared.

Description

technical field [0001] The invention relates to thermal insulation lightweight aggregate concrete for building materials, in particular to a dry-mixed composite lightweight aggregate concrete based on inorganic modified polyurethane particles. Background technique [0002] Light aggregate concrete refers to concrete with a dry apparent density of less than 1950kg / m³ prepared with light aggregate, light sand or ordinary sand, cement and water. Lightweight aggregate concrete has low apparent density, high specific strength, and good thermal insulation, heat insulation, fire resistance, and shock resistance. It is a new type of concrete that is second only to ordinary concrete in dosage. The application of high-performance lightweight aggregate concrete in construction can reduce the self-weight of the superstructure and reduce the cost of foundation treatment. Or on the premise of not increasing the cost of basic treatment, the economic benefits are very considerable by incre...

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Problems solved by technology

[0005] The present invention makes improvements to the above-mentioned existing problems, and through inorganic modification of waste polyurethane particles, it has a fireproof function, which solves the hidden safety problems of light aggregates in the transportation and construction process, can meet the requirements of safe building materials, and has relatively high High safety, effectively eliminating potential safety hazards in the construction process. In order to further improve the standardization of dry-mixed composite light aggregates, while inorganically modifying waste polyurethane, the particle size of the modified polyurethane is also standardized and graded. It can effectively guarantee the bulk density of polyurethane materials and ensure that the modified polyurethane particles can be more standardizedly applied in dry-mixed composite light aggregate concrete

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