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

A technology of recycled mixed materials and recycled fine aggregates, which is applied in the field of civil construction materials, and can solve problems such as poor environmental protection, difficult construction, and affecting backfill quality

Active Publication Date: 2020-10-23
北京城建华晟交通建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of fluid solidification regeneration mixture, it is prepared through following specific operation steps:

[0044] According to the dosage of each raw material in Table 1, the cementitious materials: cement and fly ash are added to the primary mixing tank through screw metering according to the mixing ratio; the recycled materials are batched through the batching bin and transported to the primary mixing tank through the conveyor belt. tank; the mixing water is added in two ways according to the ratio and dosage, one way is the water adding system of the first mixing tank, and the second way is the water adding system of the second mixing tank, and the mixing amount of the two ways is controlled by the flow meter. Half of the amount of water; after the cementitious material, recycled material and all the water are added to the primary mixing tank, the primary mixing is carried out to obtain the primary mixing material;

[0045] The primary mixing material is conve...

Embodiment 2-6

[0047] The preparation method of the fluid solidified recycled mixture of Examples 2-6 is exactly the same as that of Example 1, the difference is that the types and dosages of various raw materials are different, and the admixture is added by external mixing, and is not included in the fluid state Among the sum of the raw materials of the solidified recycled mixture, see Table 1 for details; see Table 1 for the sand content of redundant soil in each embodiment.

[0048] The raw material dosage (kg) of the fluid solidified regeneration mixture of table 1 embodiment 1-6

[0049]

Embodiment 7-16

[0051] The fluid solidified regenerated mixture of embodiment 7-16, its preparation method is exactly the same as embodiment 1, and difference is that each raw material type and dosage are different, see table 2 for details; Redundant soil in each embodiment The sand content is 72%.

[0052] The raw material dosage (kg) of the fluid solidification regeneration mixture of table 2 embodiment 7-16

[0053]

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2201/20C04B2111/00663C04B18/167C04B24/122C04B24/38C04B18/08C04B22/062
Inventor 张勇高海辰周鑫宇矫艳丰杨国强郭晨曦范宗斌刘飞
Owner 北京城建华晟交通建设有限公司
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