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A kind of superfine Portland cement-based grouting material and preparation method thereof

A Portland cement and grouting material technology, applied in the field of grouting reinforcement, can solve the problems of flammability, poor slurry stability, water loss, etc., and achieve the effects of improving hydrophobicity, low production cost, and improving water retention.

Active Publication Date: 2017-06-30
安徽路源环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical grouting materials are characterized by low viscosity, can be injected into micro-cracks, and the setting time can be adjusted from a few seconds to several hours. However, the price of chemical grouting materials is high, the formula is complicated, and most of them have certain toxicity and flammability. Therefore, There are also many restrictions on the application of chemical grouting materials
Ordinary cement grouting materials and modified ordinary cement-based grouting materials have the advantages of low cost, wide sources, high strength, good durability, and convenient use, but at the same time there are deficiencies, such as ordinary cement particle size is large, coarse particles More, the slurry has poor stability or high viscosity, the injectability is not as good as chemical grouting materials, bleeding when hardening and volume shrinkage after hardening, which affects the bonding strength with the reinforced body, etc.
In the process of grouting, the water retention and viscosity of the grout are two important factors. First, if the water retention of the grout is poor, under the action of pressure, the grout will lose water seriously during the injection process, resulting in the viscosity of the grout The increase will affect the penetration depth of the slurry; the second is that if the water retention of the slurry is improved by reducing the water-material ratio, the viscosity of the slurry will often be increased, and the water absorption of the crack hole wall will increase the viscosity of the slurry. degree, will also affect the penetration depth of the slurry

Method used

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  • A kind of superfine Portland cement-based grouting material and preparation method thereof
  • A kind of superfine Portland cement-based grouting material and preparation method thereof
  • A kind of superfine Portland cement-based grouting material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] An ultra-fine Portland cement-based grouting material. The formulation of the grouting material is: ultra-fine Portland cement clinker 7000g, ultra-fine fly ash 1500g, ultra-fine limestone powder 1500g, composite admixture 500g, Compound admixture 2 100g, tap water 5500g; Among them, compound admixture 1 formula is: expansion agent 550g, sodium sulfate 200g, sodium metaaluminate 200g, sodium gluconate 50g; compound admixture 2 formula is: thickening resin 50g, 150g of modified nano silica, 200g of polycarboxylic acid water reducer, and 600g of tap water.

[0021] Preparation:

[0022] In the first step, add 550g of expansion agent, 200g of sodium sulfate, 200g of sodium metaaluminate, and 50g of sodium gluconate into the mixer and mix evenly. After passing the test, compound additive one is obtained;

[0023] In the second step, add 50 g of thickening resin, 150 g of modified nano silica, 200 g of polycarboxylic acid water reducer, and 600 g of tap water to the mixer and mix ...

Embodiment 2

[0026] Example 2-different water-cement ratio

[0027] An ultra-fine Portland cement-based grouting material. The formulation of the grouting material is shown in Table 1. Among them, the formulations of the composite admixture 1 and the composite admixture 2 are the same as in Example 1.

[0028] Preparation method: The steps are the same as in Example 1, and the difference from Example 1 is that the amount of each raw material is weighed according to Table 1.

[0029] The properties of grouting materials obtained with different water-cement ratios are shown in Table 1.

[0030]

[0031] Example 3-A dosage of different composite admixtures

[0032] An ultra-fine Portland cement-based grouting material. The formulation of the grouting material is shown in Table 2; wherein, the formulations of the composite admixture 1 and the composite admixture 2 are the same as in Example 2.

[0033] Preparation method: The steps are the same as in Example 1, and the difference from Example 1 is that t...

Embodiment 4

[0036] Example 4-Two dosages of different composite admixtures

[0037] An ultra-fine Portland cement-based grouting material. The formulation of the grouting material is shown in Table 3; wherein, the formulations of composite admixture 1 and composite admixture 2 are the same as in Example 3.

[0038] Preparation method: The steps are the same as in Example 1, and the difference from Example 1 is that the amount of each raw material is weighed according to Table 3.

[0039] See Table 3 for the performance of grouting material obtained with the two dosages of different compound admixtures.

[0040] Table 3 The influence of compound admixture 2 on the performance of grouting material

[0041]

[0042] In Examples 1-4: 1. Fluidity is carried out according to GB 50119-2003 Appendix A; 2. Outflow time is tested by Markov funnel; 3. Pressure bleeding rate is carried out according to GB / T 50080; 4. Vertical expansion rate Refer to GB 50119-2003 Appendix C; 5. Initial setting time GB / T 1346-...

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Abstract

The invention belongs to the technical field of grouting reinforcement and discloses a superfine portland cement-based injecting paste material and a preparation method thereof. The injecting paste material is prepared from, by weight, 55-80 parts of superfine portland cement clinker, 10-20 parts of superfine coal ash, 5-15 parts of superfine limestone flour, 2-6 parts of first composite additive, 0.2-1.5 parts of second composite additive and 45-80 parts of water. The first composite additive is prepared from, by weight, 25-75 parts of expanding agent, 10-30 parts of anhydrous sodium sulphate, 2.5-25 parts of sodium metaaluminate and 1-10 parts of sodium gluconate. The second composite additive is prepared from, by weight, 0.5-10 parts of thickened resin, 5-25 parts of modified nanosilicon dioxide, 15-30 parts of polycarboxylate superplasticizer and 50-80 parts of water. The injecting paste material is high in slurry fluidity, small in viscosity and good in water-retaining property. The initial setting time can be adjusted. Microdilatancy occurs after hardening. 28d compressive strength ranges from 20 MPa to 60 MPa. The injecting paste material has the advantages of being short in production period and low in production cost, three wastes are not generated in the whole process, solid waste can be utilized, and the environment is not influenced.

Description

Technical field [0001] The invention belongs to the technical field of grouting and reinforcement, and particularly relates to an ultrafine Portland cement-based grouting material and a preparation method thereof. Background technique [0002] With the increasing requirements for the quality of construction projects, the application range of grouting reinforcement technology will become wider and wider, especially the grouting reinforcement of deep micro-holes. The grouting material is a key link. Therefore, how to prepare high-quality The grouting material with low production cost will become an important factor in the rapid promotion of grouting reinforcement technology. [0003] In grouting reinforcement, the reinforcement of deep-hole micro-cracks is a difficult point in grouting reinforcement. However, micro-cracks occupies a considerable proportion and play an important role in the stability and service life of the structure. It is generally believed that only when the size ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/08C04B14/28C04B22/14C04B24/10C04B24/28C04B111/70
CPCY02W30/91
Inventor 王雨利马玉祥熊祖强杨佳张耀辉
Owner 安徽路源环保科技有限公司
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