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Structured cementitious granular material and method for its preparation

A technology for cementing particles and cementing materials, which is used in infrastructure engineering, construction, soil protection, etc., and can solve the problem of failure to form integral mechanical properties, loss of soil consolidation drainage channels around gravel piles, and inability to control the compaction of cemented bodies. To achieve the effect of less environmental pollution, improved strength, and less engineering

Active Publication Date: 2021-06-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, in many projects, due to the inability to control the compactness of the cemented body after grouting, the compactness of the cemented body cannot meet the needs of the project, such as the foundation reinforcement project of gravel piles. Filling the gaps of the gravel piles completely densely makes the gravel piles lose their function as the drainage channel for the consolidation of the surrounding soil, and the cement formed by grouting and the surrounding granular materials do not form a material with overall mechanical properties.

Method used

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  • Structured cementitious granular material and method for its preparation
  • Structured cementitious granular material and method for its preparation

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preparation example Construction

[0039] The preparation method of the structured cementitious granular material 100 according to the embodiment of the present invention includes the following steps:

[0040] S1: Carry out tests according to the cementing type of the cementing granular material 2 required by the design to determine the fluidity and viscosity of the self-compacting cement-based cementing material 3;

[0041] S2: accumulation of granular material 1;

[0042] S3: Determine the cemented area of ​​the granular material 1 and the grouting amount of the self-compacting cement-based cementitious material 3 required to form the cemented granular material 2;

[0043] S4: filling the cementing area with self-compacting cement-based cementing material 3 , the self-compacting cement-based cementing material 3 binds the granular material 1 on the flow path into cemented granular material 2 . It is to be understood that, in the structured cementitious granular material 100 prepared by the preparation method...

Embodiment 1

[0051] Embodiment 1: as figure 1 As shown, the construction result of this embodiment is a contact-type structured cemented granular material 100, which can be applied to gravel pile reinforcement projects, and the structured cemented technology can be applied to rockfill dams, slopes and foundations, etc. Reinforcement project, the particle size of granular material is 0.01m-0.1m crushed stone, self-compacting cement-based cement material 3 adopts self-compacting cement paste, the expansion degree of self-compacting cement paste is 290mm, V funnel value is 1.9s, pouring The formed cemented granular material 2 only forms cementation in the local area of ​​the particle contact point, and the cemented granular material maintains the original grain skeleton structure and pore structure of the granular material, and has high water permeability.

[0052] Concrete preparation steps are as follows:

[0053] S1: Conduct tests according to the design requirements to determine that the...

Embodiment 2

[0057] Embodiment 2: as figure 2 As shown, the construction result of this embodiment is a dense structured cemented granular material 100, which can be applied to rockfill seawall projects, and the particle size of the granular material is 0.3m-1m rockfill , the self-compacting cement-based cementing material 3 adopts self-compacting concrete, the expansion degree of self-compacting concrete is 680 mm, the slump is 260 mm, and the V funnel value is 12 s. The size of the cemented granular material 2 is 3m-5m. A single cemented granular material 2 has the performance of a concrete block, and multiple cemented granular materials 2 form a structured cemented granular material 100 with surrounding rockfill materials.

[0058] Concrete preparation steps are as follows:

[0059] S1: Carry out tests according to the design requirements to determine that the self-compacting concrete that forms the dense cemented granular material 2 has a degree of expansion of 680mm, a slump of 260m...

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Abstract

The invention discloses a structured cemented granular material and a preparation method thereof. The structured cemented granular material includes granular material and cemented granular material, and the granular material is at least one of rockfill material, crushed stone material, sandy gravel and soil stone material , the cemented granular material is obtained by filling the interstices of the granular material with self-compacting cement-based cementitious material. According to the structured cemented granular material of the embodiment of the present invention, since the structured cemented granular material is composed of granular material in the form of granular body and cemented body cemented granular material, the ability of the granular material to adapt to deformation is maintained, and it has the advantage of relatively large plastic deformation , the cemented granular material is obtained by filling the particle gap of the granular material with self-compacting cement-based cementitious material, which improves the strength, stiffness and deformation modulus of the granular material, and at the same time can improve the fluidity, viscosity and pouring volume of the self-compacting cement-based cementitious material Different cementing types, shapes and volumes of cementing granules can be obtained through the control of different cementing methods, which are suitable for different engineering conditions.

Description

technical field [0001] The invention relates to the field of foundation engineering reinforcement, in particular to a structured cemented granular material and a preparation method thereof. Background technique [0002] Dangerous rockfill dams and earth-rockfill dam bodies and foundations, damming bodies, diseased slopes, deep foundation pits, seawalls and foundations are usually filled with inorganic grouting materials (mainly cement slurry) or chemical grouting materials (organic polymer materials) Mainly) for reinforcement, through the hydration reaction of cement slurry, the non-cohesive granular materials are bonded into a cemented body with overall performance, and the physical and mechanical properties of the original earth and rock materials are improved. The grouting reinforcement method has the advantages of simple construction technology and small engineering quantity. At the same time, the cement-based inorganic grouting material has the advantages of little envi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00E02D3/08
CPCC04B28/00E02D3/08C04B14/02
Inventor 金峰周虎王卫张嘎周元德徐艳杰潘坚文
Owner TSINGHUA UNIV
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