High-durability low-viscosity high-strength machine-made sand concrete as well as preparation method and application thereof

Abstract

The invention discloses high-durability low-viscosity high-strength machine-made sand concrete as well as a preparation method and application thereof. The concrete is composed of the following materials in parts by weight: 275-340 parts of cement, 32-50 parts of mineral powder, 45-100 parts of fly ash, 32-75 parts of microbeads, 700-750 parts of sand, 1000-1050 parts of broken stone, 120-140 parts of water, and 4.5-5 parts of a polycarboxylic acid multifunctional additive. The preparation method comprises the following steps: stirring the cement, the mineral powder, the fly ash, the microbeads, the sand and the broken stone for 30 seconds, fully and uniformly mixing all the materials, and then adding the polycarboxylic acid multifunctional additive and the water into a stirrer together for stirring for not less than 150 seconds to obtain the high-durability low-viscosity high-strength machine-made sand concrete. The invention also discloses an application of the high-durability low-viscosity high-strength machine-made sand concrete. The concrete prepared by the invention has the advantages of high strength, good durability and low viscosity, the engineering construction progress can be remarkably improved, and the quality problems of honeycomb pitted surfaces, cavities and the like caused by poor flowing state of concrete are reduced.

Description

technical field [0001] The application belongs to the field of building materials, and in particular relates to a high-durability, low-viscosity, high-strength machine-made sand concrete, a preparation method and an application. Background technique [0002] With the continuous expansion of the scope of infrastructure construction in our country, the demand for concrete is showing an upward trend year by year, and the demand for sand, which is one of the main raw materials for preparing concrete, is also increasing year by year. Since natural sand is a non-renewable resource, excessive exploitation will lead to the deterioration of the ecological environment, so it is urgent to find a substitute for natural sand. Machine-made sand is made by mechanical crushing and screening. Rocks, mine tailings or industrial waste particles with a particle size of less than 4.75mm have been widely used in concrete production as a substitute for natural sand in recent years, and can be used...

AI Technical Summary

Problems solved by technology

[0004] In view of the shortcomings or deficiencies of the above-mentioned prior art, the technical problem to be solved in this application is to provide a high-durability, low-viscosity, high-strength machine-made sand concrete, preparation method and application. The concrete prepared by this application has high strength, good durability, and low viscosity. It can significantly improve the construction progress of the project and reduce quality problems such as honeycomb pockmarks and cavities caused by poor concrete flow state. The slump of the concrete is not less than 200mm, and the slump loss is not more than 20mm / h. The emptying time of the inverted slump cylinder is not more than 15s, the compressive strength is not less than 95MPa at 28 days, the gas content is 2% to 4%, the electric flux is less than 750C in 56 days, and the drying shrinkage value in 56 days is less than 500×10 -6

Images