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Sulfoaluminate-cement-based quick-setting quick-hardening flowable backfilling material prepared from construction waste

A technology of sulphoaluminate cement and construction waste, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., and can solve problems such as emergency repairs, waste, and secondary pollution of resources

Inactive Publication Date: 2014-10-08
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main research and widespread use are the regenerated coarse aggregates of construction waste with good quality (particle size greater than 4.75mm), but the poor quality regenerated fine materials of construction waste (with a particle size of less than 4.75mm) are rarely used. Low recycling rate, causing secondary pollution and waste of resources
Moreover, the above-mentioned backfilling new materials cannot utilize low-quality construction waste fine materials, and cannot meet the requirements of emergency repairs when the road surface collapses or other dangerous situations or require rapid backfilling construction and other emergency projects.

Method used

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  • Sulfoaluminate-cement-based quick-setting quick-hardening flowable backfilling material prepared from construction waste
  • Sulfoaluminate-cement-based quick-setting quick-hardening flowable backfilling material prepared from construction waste
  • Sulfoaluminate-cement-based quick-setting quick-hardening flowable backfilling material prepared from construction waste

Examples

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specific Embodiment approach

[0099] Due to pipeline protection and narrow building boundaries, large-scale compaction machines cannot be used for backfilling construction of road trenches in a certain city. At the same time, due to traffic conditions, traffic needs to be opened as soon as possible. Adopt the fluidity backfill material of fast-setting rapid-hardening type construction waste based on sulphoaluminate cement provided by the present invention, the specific implementation method is as follows:

[0100] Construction materials: the cement used is fast-hardening sulfoaluminate cement, with a strength grade of 42.5; the construction waste fine material is produced by a certain recycling plant, with a technical grade of Ⅰ-1 and a moisture content of 3%; the fly ash is classified as F class Ⅰ grade, with a water content of 2%, the water reducing agent is melamine water reducing agent, and its quality is in line with the national technical standards; the water is potable tap water.

[0101] constructi...

Embodiment 2

[0110] The road surface of a certain city has collapsed and needs to be backfilled urgently. The fast-setting rapid-hardening construction waste fluidity backfill material based on sulphoaluminate cement provided by the present invention is implemented in the following manner:

[0111] Construction materials: the cement used is fast-hardening sulfoaluminate cement, with a strength grade of 42.5; the construction waste fine material is produced by a recycling plant, with a technical grade of Ⅱ-2 and a moisture content of 4%; the fly ash is classified as F and Ⅲ Grade, water content 5%, superplasticizer is polycarboxylate high-efficiency superplasticizer, its quality is in line with national technical standards; water is potable tap water.

[0112] construction process:

[0113] 1. Clean up the foundation pit: remove the dross, floating soil and other sundries in the foundation pit, and tamp and level it, and the edge parts are cut neatly.

[0114] 2. Construction machinery: 2 ...

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Abstract

The invention relates to a civil engineering material, particularly a sulfoaluminate-cement-based quick-setting quick-hardening flowable backfilling material prepared from construction waste, which is suitable for emergency repair or quick backfilling of collapse and other dangerous situation on the road surface and also suitable for underground engineering, narrow construction pit backfilling and the like. The backfilling material is characterized by comprising 1200-1400 kg / m<3> of construction waste fine material, 70-240 kg / m<3> of cement, an additive which accounts for 1-3 wt% of the cement, an admixture which accounts for 10-20 wt% of the construction waste fine material, and the balance of water. The cement is quick-hardening sulfoaluminate cement, and the strength level is 42.5; and the admixture is one or any mixture of slag powder, fly ash, phosphorus slag powder, silica fume and clay soil. The material has the advantages of self-compaction filling and favorable flowability, and can satisfy the requirements of quick setting and hardening; and the mechanical strength is adjustable after the material is hardened.

Description

technical field [0001] The invention relates to a new type of civil engineering material, which is a fast-setting and fast-hardening fluid backfill material based on sulphoaluminate cement produced by using construction waste, and is suitable for emergency repairs when the road surface collapses and other dangerous situations or requires fast backfilling Emergency projects such as construction are also suitable for backfilling of retaining walls, backfilling of bridges and culverts, backfilling of road widening subgrades, backfilling of urban road trenches, backfilling around inspection wells, backfilling of underground works and small building foundation pits, etc. Background technique [0002] In recent years, road subsidence accidents in major cities in my country have occurred frequently, causing a large amount of economic and property losses, and causing widespread concern in the society. The impact of road subsidence accidents on cities is not limited to the traffic in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B18/16
CPCY02W30/91
Inventor 张金喜冉晋马宝成袁晓斌
Owner BEIJING UNIV OF TECH
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