Machine-made sand concrete and preparation method thereof

Abstract

The invention relates to concrete, in particular to machine-made sand concrete and a preparation method thereof. The concrete comprises the following materials in parts by weight: 320-330 parts of cement, 60-70 parts of mineral powder, 40-50 parts of fly ash, 710-730 parts of sand, 1050-1100 parts of gravel, 165-175 parts of water, 8-9 parts of an admixture and 100-110 parts of water absorption blocks. The admixture improves the flowability of the concrete and delays the hydration process, so that the concrete is not easy to bleed, and the workability is improved. The added water absorption blocks can be used as a lubricating substance of machine-made sand, and the water absorption blocks are not completely saturated at the moment and can continuously absorb bleeding water or redundant water in the concrete, so that the workability is further improved.

Description

technical field [0001] The invention relates to concrete, in particular to machine-made sand concrete and a preparation method thereof. Background technique [0002] Machine-made sand has been crushed, and its particles are irregular in shape. The stone is hard, its surface area is larger than that of river sand, and its bonding performance is better, which can form a better bonding effect with cement. The rough surface of machine-made sand makes it less workable. For example, the machine-made sand concrete and its preparation process disclosed in the Chinese patent, the application number 201910765127.5 records: the machine-made sand is crushed, the particles are in irregular shape, the stone is hard, and the bonding performance is good, and it can form a good bond with cement. direct effect. However, the particle gradation of machine-made sand is poor. There are too many particles larger than 2.5mm and smaller than 0.08mm, which will easily affect the workability of conc...

AI Technical Summary

Problems solved by technology

However, the particle gradation of machine-made sand is poor. There are too many particles larger than 2.5mm and smaller than 0.08mm, which will easily affect the workability of concrete and adversely affect the appearance quality of concrete. The multi-angular and rough surface characteristics of machine-made sand Poor workability and poor performance of the prepared concrete

[0003] In the existing technology, chemical agents such as sodium hydroxide are used to retard the setting of concrete, so as to improve the workability, but it is conceivable that these agents are harmful to the human body, and long-term use of such a process will cause physical damage to construction workers

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