Fluid-state cured recycled mixture, preparation method and application thereof in pit slot backfilling

Abstract

The invention relates to the technical field of civil construction materials, in particular to a fluid-state cured recycled mixture, a preparation method and application of the fluid-state cured recycled mixture in pit slot backfilling. The fluid-state cured recycled mixture is prepared from the following raw materials in percentage by weight: 60-70% of a recycled material, 10-20% of a cementing material and 15-25% of an additive and water. The additive is added in an external mixing manner, and the mixing amount of the additive is 0-0.5% of the total weight of the cementing material. The recycled material comprises recycled fine aggregate and redundant soil in a weight ratio of (3-5): (5-7), has good fluidity, is especially suitable for filling deep concave narrow space, has the characteristics of no vibration and convenience in construction, and has moderate 28d strength and good secondary excavability. Construction waste is adopted to replace natural materials such as soil and riversand, cyclic utilization of waste resources is achieved, and saving and environmental protection are achieved.

Description

technical field [0001] The invention relates to the technical field of civil engineering and building materials, in particular to a fluid solidified recycled mixture, a preparation method and its application in pit backfilling. Background technique [0002] For example, the backfilling of 28 ash soil or 38 ash soil of traditional technology has the following defects: first, 28 ash soil or 38 ash soil is mixed with white ash and soil in a weight ratio of 2:8 or 3:8 Solid powder, when backfilling in layers, will cause serious dust and poor environmental protection; second, in the process of backfilling, use small tamping equipment to carry out construction, tamping layer by layer, the construction is difficult and the construction efficiency is low; third, when subject to backfilling conditions, When factors such as depth or space are limited, it is difficult to achieve layer-by-layer compaction by tamping equipment, resulting in insufficient compactness of backfill soil, and ...

AI Technical Summary

Problems solved by technology

[0002] For example, the backfilling of 28 ash soil or 38 ash soil of traditional technology has the following defects: first, 28 ash soil or 38 ash soil is mixed with white ash and soil in a weight ratio of 2:8 or 3:8 Solid powder, when backfilling in layers, will cause serious dust and poor environmental protection; second, in the process of backfilling, use small tamping equipment to carry out construction, tamping layer by layer, the construction is difficult and the construction efficiency is low; third, when subject to backfilling conditions, When factors such as depth or space are limited, it is difficult to achieve layer-by-layer compaction by tamping equipment, resulting in insufficient backfill density, and local narrow spaces are prone to form cavities, affecting the quality of backfill

In this prior art, a gravel-like material with relatively large pores is formed through the cooperation of regenerated coarse aggregate and regenerated fine aggregate with different larger gradations, which is mainly used in expressway base materials; but its fluidity is poor, and it is used in There are also problems such as difficult construction in pit backfilling.

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