A full-solid-waste geopolymer grouting material and a preparation method thereof

Abstract

The application provides a kind of full solid waste geopolymer grouting material and preparation method thereof, relate to solid waste resource utilization and geopolymer grouting material preparation technical field.The full solid waste geopolymer grouting material includes the following weight parts of raw materials: full solid waste mixture 100-200 parts, alkaline activator 40-50 parts, early strength agent 0.1-0.5 parts, water reducing agent 0.5-1 part, modifier 3-7 parts, water 70-90 parts;The full solid waste material includes slag powder, steel slag powder, phosphogypsum, fly ash;The modifier includes aluminum dihydrogen phosphate, vinyl triacetoxy silane, ethylenediamine terminated polyethylene imine.The full solid waste geopolymer grouting material provided by the application has good working performance, high early strength, micro-expansibility and other characteristics.

Description

TECHNICAL FIELD

[0001] The present application relates to solid waste resource utilization and geopolymer grouting material preparation technical field, in particular to a kind of full solid waste super high performance geopolymer grouting material and preparation method thereof. BACKGROUND

[0002] Roads will appear various diseases in the long-term use process under the influence of geological environment and vehicles and other factors, among which cracks, holes, depressions and voids are the most serious, which will eventually lead to the decrease of road bearing capacity and even subsidence. The use of base milling and re-paving has problems such as long construction time, complex construction process, high comprehensive cost, high carbon emission, etc. Cement grouting material is a commonly used material for road grouting disposal at present, but it has problems such as long setting time, poor stability, high water separation rate, large shrinkage, etc. Moreover, the cement content in the cement grouting material is relatively high, which results in high energy consumption, and the production of cement will cause environmental pollution. Geopolymer grouting material is a new type of foundation reinforcement material formed by the depolymerization-repolymerization reaction of various solid waste powders under the action of activator, which has excellent mechanical properties, simple construction process, low comprehensive cost, and can also solve the problems of land occupation and environmental pollution caused by solid waste stacking, and is expected to replace high-energy-consumption grouting materials such as cement grouting material.

[0003] However, for grouting of weak areas such as road subgrade voids or base cracks, which have poor injectability, higher technical requirements are put forward for road geopolymer grouting material, which needs to have higher fluidity to achieve grouting, and excellent reinforcement effect, and can react and solidify at room temperature to form high strength. The existing geopolymer grouting material still has problems of poor workability and mechanical properties when used for grouting of road voids or crack areas, which limits the application of geopolymer grouting material in road reinforcement and reinforcement engineering.

[0004] Therefore, the present application aims to make full use of industrial solid waste materials and develop a full solid waste geopolymer grouting material. Through the synergistic reaction of fly ash, slag, steel slag and phosphogypsum and other industrial solid wastes, combined with the accelerated solidification effect of high molecular polymer, a new green and environmentally friendly polymer material is formed, which can be used for base reinforcement, soft soil reinforcement and other aspects. SUMMARY

[0005] In view of the shortcomings of the prior art, the present application provides a full solid waste geopolymer grouting material and a preparation method thereof, which has good workability, high early strength and micro-expansion, etc.

[0006] To achieve the above purpose, the present application is realized by the following technical scheme:

[0007] The full solid waste geopolymer grouting material comprises raw materials in the following weight parts: 100-200 parts of full solid waste mixture, 40-50 parts of alkaline activator, 0.1-0.5 parts of early strength agent, 0.5-1 part of water reducing agent, 3-7 parts of modifier, and 70-90 parts of water; the full solid waste material comprises slag powder, steel slag powder, phosphogypsum and fly ash; and the modifier comprises aluminum dihydrogen phosphate, vinyltriacetoxysilane and ethylenediamine-terminated polyethyleneimine.

[0008] The full solid waste geopolymer grouting material of the application activates multiple solid wastes by using the alkali activation principle, and then improves the three-dimensional structure of the geopolymer grouting material from the micro level by using a specific modifier, so that the synergistic effect of the four solid waste materials of slag powder, steel slag powder, phosphogypsum and fly ash is enhanced, the combination between particles is more compact, and the micro distribution is more ordered, a large amount of hydrated calcium silicate and hydrated silico-aluminate and other hydration products are generated, the setting time of the prepared full solid waste geopolymer grouting material is shortened, the flow performance is better, and the early strength is higher.

[0009] Preferably, the mass ratio of the aluminum dihydrogen phosphate, the vinyltriacetoxysilane and the ethylenediamine-terminated polyethyleneimine is (2-3):(0.5-2):1. Further preferably, the mass ratio of the aluminum dihydrogen phosphate, the vinyltriacetoxysilane and the ethylenediamine-terminated polyethyleneimine is 2.5:1.5:1.

[0010] Preferably, the number average molecular weight of the ethylenediamine-terminated polyethyleneimine is 600-800.

[0011] Preferably, the raw materials of the full solid waste mixture include slag powder, steel slag powder, phosphogypsum and fly ash, and the mass ratio of the slag powder, the steel slag powder, the phosphogypsum and the fly ash is (20-50):(25-45):(30-60):(5-30).

[0012] Preferably, the alkaline activator is at least one of sodium hydroxide, potassium hydroxide, water glass and sodium carbonate.

[0013] Preferably, the early strength agent is a mixture of sodium thiosulfate and triisopropanolamine in a mass ratio of 1:(0.2-0.5), and the water reducing agent is a polycarboxylic acid water reducing agent.

[0014] The application further discloses a preparation method of the full solid waste geopolymer grouting material.

[0015] Compared with the prior art, the application has the following beneficial effects:

[0016] (1) The geopolymer fully utilizes industrial solid waste, has high utilization rate and large consumption of solid waste, and realizes taking waste and using it for road.

[0017] (2) The geopolymer is environment-friendly, the raw materials of the geopolymer are all solid waste, the full solid waste material after alkali activation is modified by using a specific proportion of vinyltriacetoxysilane, di-aluminum hydrogen phosphate and ethylenediamine-terminated polyethyleneimine, and the geopolymerization reaction is performed, so that the grouting material reaches a good balance between cohesiveness and fluidity, the dispersibility of solid waste particles and the binding force between the particles are enhanced, the silicon in the solid waste produces a coordination isomorphism effect on aluminum, the body forms a complex three-dimensional network structure, a large amount of C(N)-A-S-H amorphous cementitious substances are generated in the geopolymer, a dense cementitious structure is formed, the early strength and stability of the grouting material are improved, and the comprehensive road performance of the grouting material is improved.

[0018] (3) The geopolymer of the present invention has the following characteristics: rapid setting and early strength, slight expansion, economical and durable, green and low carbon. The geopolymer of the present invention has wide applicability. The setting time of the geopolymer is controllable. It is not only suitable for trenchless reinforcement of existing highway base courses, but also for rapid opening of traffic, ensuring smooth traffic and reducing investment. It can also be used for reinforcement of old road base courses and soft soil reinforcement in the reconstruction and expansion of highways. Attached Figure Description

[0019] Appendix Figure 1 Deflection test and evaluation curves before and after grouting in this embodiment of the invention;

[0020] Appendix Figure 2 Comparison of the repair effects of the all-solid waste geopolymer grouting material of this invention on loose base layers and base layer cracks. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] A solid waste geopolymer grouting material comprises the following raw materials in parts by weight: 100-200 parts of solid waste mixture, 40-50 parts of alkaline activator, 0.1-0.5 parts of early strength agent, 0.5-1 parts of water-reducing agent, 3-7 parts of modifier, and 70-90 parts of water; the solid waste mixture includes slag powder, steel slag powder, phosphogypsum, and fly ash, wherein the mass ratio of slag powder, steel slag powder, phosphogypsum, and fly ash is (20-50):(25-45):(30-60):(5-30); the modifier includes aluminum dihydrogen phosphate, vinyltriacetoxysilane, and ethylenediamine-terminated polyethyleneimine.

[0023] In some examples, the mass ratio of aluminum dihydrogen phosphate, vinyltriacetoxysilane, and ethylenediamine-terminated polyethyleneimine is (2-3):(0.5-2):1.

[0024] In some examples, the number-average molecular weight of the ethylenediamine-terminated polyethyleneimine is 600 to 800.

[0025] In the following examples and comparative examples, unless otherwise specified, the main chemical components of the phosphogypsum are: CaO content of 38.0%, SiO2 content of 8.3%, and 500m 2 / kg; the slag powder is S95 granulated blast furnace slag with a specific surface area of ​​450m². 2 / kg; the steel slag powder is converter steel slag powder, the material fineness is 500 meshes, the CaO content is 48.3%, the basicity is 3.1, the specific surface area is 500 m 2 / kg; the fly ash is first-class F fly ash, the fineness is 500 meshes; the alkali activator is sodium hydroxide; the early strength agent is a mixture of sodium thiosulfate and triisopropanolamine with a mass ratio of 1:0.3, the water reducing agent is a polycarboxylic acid water reducing agent, and the number average molecular weight of the ethylenediamine-terminated polyethyleneimine is 600.

[0026] Example 1

[0027] A full-solid-waste geopolymer grouting material includes the following raw materials in parts by weight: full-solid-waste mixture 100 parts, alkali activator 40 parts, early strength agent 0.3 parts, water reducing agent 0.5 parts, modifier 5 parts, and water 70 parts; the full-solid-waste material includes 35 parts of slag powder, 30 parts of steel slag powder, 30 parts of phosphogypsum, and 5 parts of fly ash; the modifier includes aluminum dihydrogen phosphate, vinyltriacetoxysilane, and ethylenediamine-terminated polyethyleneimine with a mass ratio of 2:2:1.

[0028] A preparation method of the full-solid-waste geopolymer grouting material includes the following steps: S1. mixing slag powder, steel slag powder, phosphogypsum, and fly ash to obtain full-solid-waste mixture; S2. mixing the full-solid-waste mixture, alkali activator, and 1 / 3 water to activate; S3. adding the early strength agent, water reducing agent, modifier, and the remaining water in a proportion to the step S2 to mix uniformly to obtain the full-solid-waste geopolymer grouting material.

[0029] Example 2

[0030] A full-solid-waste geopolymer grouting material includes the following raw materials in parts by weight: full-solid-waste mixture 150 parts, alkali activator 45 parts, early strength agent 0.3 parts, water reducing agent 0.8 parts, modifier 3 parts, and water 80 parts; the full-solid-waste material includes 50 parts of slag powder, 25 parts of steel slag powder, 50 parts of phosphogypsum, and 25 parts of fly ash; the modifier includes aluminum dihydrogen phosphate, vinyltriacetoxysilane, and ethylenediamine-terminated polyethyleneimine with a mass ratio of 2.5:1.5:1. The preparation method is the same as that in Example 1.

[0031] Example 3

[0032] A full-solid-waste geopolymer grouting material includes the following raw materials in parts by weight: full-solid-waste mixture 200 parts, alkali activator 50 parts, early strength agent 0.5 parts, water reducing agent 1 part, modifier 7 parts, and water 90 parts; the full-solid-waste material includes 40 parts of slag powder, 50 parts of steel slag powder, 90 parts of phosphogypsum, and 20 parts of fly ash; the modifier includes aluminum dihydrogen phosphate, vinyltriacetoxysilane, and ethylenediamine-terminated polyethyleneimine with a mass ratio of 3:1:1. The preparation method is the same as that in Example 1.

[0033] Comparative Example 1

[0034] The 42.5 ordinary portland cement grouting material was used as a comparison, and the water-cement ratio was 0.7.

[0035] Comparative Example 2

[0036] The geopolymer grouting material was substantially the same as Example 2, except that the modifier was vinyltriacetoxysilane, ethylenediamine-terminated polyethyleneimine at a mass ratio of 1.5:1.

[0037] Comparative Example 3

[0038] The geopolymer grouting material was substantially the same as Example 2, except that the modifier was aluminum dihydrogen phosphate, vinyltriacetoxysilane, polyethyleneimine at a mass ratio of 2.5:1.5:1.

[0039] Comparative Example 4

[0040] The geopolymer grouting material was substantially the same as Example 2, except that the modifier was aluminum dihydrogen phosphate, vinyltriethoxysilane, ethylenediamine-terminated polyethyleneimine at a mass ratio of 2.5:1.5:1.

[0041] The flowability, setting time, and mechanical properties of the grouting materials of Examples 1-3 and Comparative Examples 1-4 were tested. The flow cone test was used to test the flowability of the slurry, and the time required for 1725 mL of soil to completely flow out 5 ml of grouting material was used to characterize the flowability. The less time used, the better the flowability of the grouting material. The mechanical properties were tested in accordance with the “Test Code for Highway Engineering Cement and Cement Concrete” (JTG3420-2020) and the “Technical Code for Application of Cement-based Grouting Materials” (GB / T50448-2015), and the three-punch mold with a specification of 40 mm x 40 mm x 160 mm was used to form the test piece and conduct the compression test.

[0042]

[0043] From the above table, compared with Example 1, Comparative Example 1 uses cement grouting material, Comparative Example 2 lacks di aluminum hydrogen phosphate, Comparative Example 3 uses polyethylene imine to replace equivalent ethylenediamine-terminated polyethylene imine, and Comparative Example 4 uses vinyl triethoxysilane to replace vinyl triacetoxy silane, and the working performance and mechanical properties of the obtained grouting material are far lower than those of the grouting material of the present application, which is mainly because the present application activates the multi-element solid waste material by using the alkali activation principle, and uses specific proportions of vinyl triacetoxy silane, di aluminum hydrogen phosphate and ethylenediamine-terminated polyethylene imine to synergistically achieve a good balance between adhesion and fluidity of the grouting material, enhance the dispersibility of solid waste particles and the binding force between particles, form a complex three-dimensional network structure of the machine body, promote the generation of a large amount of C(N)-A-S-H amorphous cementitious substance inside the geopolymer, form a dense cementitious structure, improve the early strength and stability of the grouting material, and thus improve the comprehensive road performance of the grouting material.

[0044] Application example

[0045] The present application uses the full solid waste geopolymer grouting material to reinforce the base of a certain expressway, and the deflection value is reduced by 30% before and after grouting, as shown in the following table Figure 1 In addition, the present inventors also use the full solid waste geopolymer grouting material to repair loose base and base cracks, and the specific repair effect is shown in the following table Figure 2 .

[0046] In summary, the geopolymer grouting material of the present application has significant advantages compared to traditional maintenance methods: construction time: the traditional cement maintenance method has a long maintenance time, slow strength formation, and a large impact on closed traffic; the geopolymer of the present application has wide applicability, controllable setting time, fast setting and early strength, slight expansion, economic durability, green and low carbon, and is not only suitable for non-excavation reinforcement of existing highway base, but also can be used for old road base reinforcement, soft soil reinforcement and other aspects in highway reconstruction. Environmental protection: compared with cement grouting, carbon emissions can be reduced by 81% per kilometer.

[0047] Although embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A solid waste geopolymer grouting material, characterized in that, The raw materials include the following parts by weight: 100-200 parts of solid waste mixture, 40-50 parts of alkaline activator, 0.1-0.5 parts of early strength agent, 0.5-1 parts of water-reducing agent, 3-7 parts of modifier, and 70-90 parts of water; the solid waste mixture includes slag powder, steel slag powder, phosphogypsum, and fly ash; the modifier is composed of aluminum dihydrogen phosphate, vinyltriacetoxysilane, and ethylenediamine-terminated polyethyleneimine.

2. The all-solid-waste geopolymer grouting material according to claim 1, characterized in that, The mass ratio of aluminum dihydrogen phosphate, vinyltriacetoxysilane, and ethylenediamine-terminated polyethyleneimine is (2-3):(0.5-2):

1.

3. The all-solid-waste geopolymer grouting material according to claim 2, characterized in that, The mass ratio of aluminum dihydrogen phosphate, vinyltriacetoxysilane, and ethylenediamine-terminated polyethyleneimine is 2.5:1.5:

1.

4. The all-solid-waste geopolymer grouting material according to claim 1, characterized in that, The number-average molecular weight of the ethylenediamine-terminated polyethyleneimine is 600-800.

5. The all-solid-waste geopolymer grouting material according to claim 1, characterized in that, The raw materials of the solid waste mixture include slag powder, steel slag powder, phosphogypsum and fly ash, and the mass ratio of slag powder, steel slag powder, phosphogypsum and fly ash is (20-50):(25-45):(30-60):(5-30).

6. The all-solid-waste geopolymer grouting material according to claim 1, characterized in that, The alkaline activator is at least one of sodium hydroxide, potassium hydroxide, water glass, and sodium carbonate.

7. The all-solid-waste geopolymer grouting material according to claim 1, characterized in that, The early strength agent is a mixture of sodium thiosulfate and triisopropanolamine in a mass ratio of 1:(0.2-0.5), and the water-reducing agent is a polycarboxylate water-reducing agent.

8. A method for preparing a solid waste geopolymer grouting material as described in any one of claims 1-7, characterized in that, The process includes the following steps: S1. Mixing slag powder, steel slag powder, phosphogypsum, and fly ash evenly to obtain a solid waste mixture; S2. Activating the solid waste mixture, alkaline activator, and 1 / 3 water by mixing; S3. Adding a certain proportion of early strength agent, water-reducing agent, modifier, and remaining water to step S2 and mixing evenly to obtain a solid waste geopolymer grouting material.

Images