High-performance machine-made sand marine concrete and preparation method thereof

Abstract

The invention discloses high-performance machine-made sand marine concrete and a preparation method thereof. The machine-made sand marine concrete comprises the following raw material components in parts by weight: 100 parts of portland cement, 10-50 parts of fly ash, 10-50 parts of mineral powder, 240-290 parts of machine-made sand, 320-370 parts of broken stone, 0.9-1.5 parts of a polycarboxylate water reducer, and 44-57 parts of water. The machine-made sand marine concrete disclosed by the invention has the characteristics of being convenient to construct, low in cost, good in working performance, high in early-stage and middle-later-stage mechanical property, excellent in durability, good in volume stability, and strong in pumpability, and is close to or even higher than river sand marine concrete in the aspects of concrete performance and technical indexes; and according to the machine-made sand marine concrete, the defects of shortage of river sand resources, instable quality, high price and the like are overcome, and the technical problems of machine-made sand in the fields of preparation and performance research for marine concrete are solved.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a high-performance machine-made sand marine concrete and a preparation method thereof. Background technique [0002] With the continuous development of infrastructure projects such as large cross-sea bridges and subsea tunnels, marine concrete is widely used in infrastructure projects, which puts forward higher technical requirements for the performance of marine concrete than ordinary concrete. At present, the marine concrete in the marine environment or coastal environment mainly uses river sand for concrete preparation, but there are many problems, such as: the quality of river sand is unstable, resources are increasingly scarce, prices are rising, and supply is not timely, which easily affects the construction period. Increase the cost of the project; due to the shortage of river sand, some unscrupulous traders sell sea sand as river sand, which directly leads to a decline i...

AI Technical Summary

Problems solved by technology

At present, the marine concrete in the marine environment or coastal environment mainly uses river sand for concrete preparation, but there are many problems, such as: the quality of river sand is unstable, resources are increasingly scarce, prices are rising, and supply is not timely, which easily affects the construction period. Increase the cost of the project; due to the shortage of river sand, some unscrupulous traders sell sea sand as river sand, which directly leads to a decline in the quality of the construction project and fails to meet the design service life requirements, causing major quality hidden dangers, seriously affecting and threatening the country. The safety of basic building facilities; and the large-scale mining of river sand will lead to excessive pollution of the natural environment, especially the river bed

Therefore, it is extremely necessary to find alternative raw materials for river sand and apply it to the concrete field. Machine-made sand is a kind of mine resource, and its particle size distribution is generally not as good as river sand. Use machine-made sand instead of river sand to prepare pumps When delivering concrete, it is easy to reduce the overall performance of concrete due to improper sand ratio, which affects the strength and durability of concrete. There is no large-scale application of machine-made sand in the field of marine concrete, and its preparation and performance research are still technical blanks

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