Large-fluidity spread concrete and preparation method thereof

Abstract

The invention provides large-fluidity spread concrete and a preparation method thereof. The concrete includes 34-39 parts of cement, 17-20 parts of a mineral additive, 110-131 parts of coarse aggregate, 82-95 parts of fine aggregate, 15-19 parts of tap water, 1.6-2 parts of an admixture, and 0.7-1 part of a compound thixotropic agent, wherein the admixture is a polycarboxylic acid high-efficiencywater reducer and an air entraining agent, and the compound thixotropic agent is starch phosphate ester, ultra-fine zeolite powder and gelatin. The starch phosphate ester, the ultra-fine zeolite powder, the gelatin, the polycarboxylic acid high-efficiency water reducer and the air entraining agent are mixed with other raw materials to make the concrete endowed with large fluidity and excellent shape retention ability. The contradiction between the fluidity and the shape retention ability of the concrete is solved, and such problems are solved that at present, concrete over-vibration is causedby the adoption of high-frequency vibration to compact the low-fluidity concrete, aggregate settlement and segregation occur and the gas content is reduced. The construction performance of the concrete is greatly improved, the service life of the concrete is greatly prolonged in engineering, the spread quality is ensured, and the concrete can be spread more smoothly and uniformly.

Description

technical field

[0001] The invention relates to the technical field of concrete materials, in particular to a large fluidity paving concrete and a preparation method thereof. Background technique

[0002] The traditional track construction of the integral track bed of the subway adopts the method of manually fine-tuning the track and pouring concrete on site, which has many disadvantages such as slow construction progress, difficult quality control of cast-in-place concrete, high labor intensity, and harsh working environment. High-speed railway slab track has the advantages of factory prefabrication, on-site mechanized assembly, and convenient maintenance and replacement, and will become the main type of domestic track structure design in the future. With the rapid development of domestic precast concrete assembly industrialization and high-speed railway slab track, a new idea and model have been brought to the construction and development of subway track engineering. The a...

Images