Low-cost high-efficiency soft soil curing agent and preparation method thereof

Abstract

The invention discloses a low-cost and high-efficiency soft soil curing agent. The soft soil curing agent is prepared from the following materials in parts by mass: 35-40 parts of building demolition mortar powder, 8-10 parts of alpha crystal form nano aluminum oxide powder, 12-14 parts of water glass, 5-8 parts of liquid resin, 5-8 parts of a water reducing agent and 5-8 parts of a defoaming agent. The alpha-crystal-form nanometer aluminum oxide is narrow in particle size distribution range, low in specific surface area and capable of being more easily and uniformly dispersed in the soil, and agglomerates formed by the alpha-crystal-form nanometer aluminum oxide and the water glass are more uniform, so that the overall stress intensity is uniform after the soil is solidified.

Description

Technical Field

[0001] The invention relates to the technical field of soil solidifying agents, and in particular to a low-cost and high-efficiency soft soil solidifying agent and a preparation method thereof. Background Art

[0002] Soil stabilizer is a new type of energy-saving and environmentally friendly engineering material used to solidify various types of soil. After being mixed with soil, it changes the engineering properties of the soil through a series of physical and chemical reactions, which can make soil particles tend to condense, easy to compact and stabilize, thus forming an overall structure and achieving a compaction density that cannot be achieved by conventional methods. The strength, density, rebound modulus, shear strength and other properties of the soil treated with soil stabilizer have been greatly improved, thereby extending the service life of the road, saving engineering maintenance costs, and having high economic and environmental benefits. It is currently an ideal choice for road construction materials.

[0003] With the acceleration of economic construction, a large amount of solid waste and CO2 gas are generated in the production process of engineering construction, steel smelting, and chemical industry, mainly including waste concrete, steel slag, LF furnace refining slag and triethanolamine residue. The above solid waste has a low utilization rate and is mostly piled up, polluting the environment; and a large amount of CO2 is discharged into the atmosphere, causing various environmental problems. How to utilize these solid wastes in infrastructure projects and turn them into treasures to achieve reduction and harmlessness is of great significance.

[0004] However, the main raw materials of most soft soil solidifying agents in currently disclosed patents and published literature are to use strong alkaline substances such as water glass and sodium hydroxide to undergo physical and chemical reactions such as depolymerization with SiO2 and Al2O3 in slag and fly ash to generate substances such as calcium aluminate to produce cementation, thereby condensing soil particles into an integral, solid, stable and durable plate structure. However, the agglomerates produced by the cementation are not easy to disperse in the soil, resulting in uneven overall stress strength of the soil after solidification. Summary of the invention

[0005] The present invention provides a low-cost and high-efficiency soft soil solidifying agent and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A low-cost and high-efficiency soft soil curing agent is prepared from the following materials in parts by mass: 35-40 parts of building demolition mortar powder, 8-10 parts of alpha crystal nano alumina powder, 12-14 parts of water glass, 5-8 parts of liquid resin, 5-8 parts of water reducing agent, and 5-8 parts of defoaming agent.

[0008] As a further improvement of the technical solution: the soft soil curing agent is made of the following materials in parts by mass: 35 parts of building demolition mortar powder, 8 parts of alpha crystal nano alumina powder, 12 parts of water glass, 5 parts of liquid resin, 5 parts of water reducer, and 5 parts of defoaming agent.

[0009] As a further improvement of the technical solution: the soft soil curing agent is made of the following materials in parts by mass: 38 parts of building demolition mortar powder, 9 parts of alpha crystal nano alumina powder, 13 parts of water glass, 7 parts of liquid resin, 7 parts of water reducer, and 7 parts of defoaming agent.

[0010] As a further improvement of the technical solution: the soft soil curing agent is made of the following materials in parts by mass: 40 parts of building demolition mortar powder, 10 parts of alpha crystal nano alumina powder, 14 parts of water glass, 8 parts of liquid resin, 8 parts of water reducer, and 8 parts of defoaming agent.

[0011] As a further improvement of the technical solution: the water reducer is a polycarboxylate water reducer, the polycarboxylate water reducer is liquid, and the solid content of the polycarboxylate water reducer is 50%.

[0012] As a further improvement of the technical solution: the defoaming agent is tributyl phosphate.

[0013] As a further improvement of the technical solution: the liquid resin is SJ-30 liquid resin, liquid silicone or liquid epoxy resin.

[0014] As a further improvement of the technical solution: the average particle size of the alpha crystal nano-alumina powder is 5-20 um.

[0015] The present invention also provides a method for preparing a low-cost and high-efficiency soft soil solidifying agent, comprising the following steps:

[0016] The first step is to pick out plastics, metal objects and wood from the building demolition waste, select the concrete fragments generated during the building demolition process, and then place the selected concrete fragments in an oven at 100-150° C. to bake until the moisture content is less than 2%, grind the obtained product, and pass it through a 200-mesh sieve to obtain building demolition mortar powder;

[0017] In the second step, the building demolition mortar powder, alpha crystal nano-alumina powder, water glass, liquid resin, water reducing agent and defoaming agent are mixed in proportion to obtain the low-cost and high-efficiency soft soil curing agent.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention adopts alpha crystal nano-alumina, which has a narrow particle size distribution range and a low specific surface area, and is easier to disperse evenly in the soil. The agglomerates formed by the nano-alumina and water glass are more uniform, so that the overall stress strength of the soil is uniform after solidification.

[0020] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 This is a schematic diagram of a method for preparing a low-cost and high-efficiency soft soil solidifying agent proposed by the present invention. DETAILED DESCRIPTION

[0023] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] Embodiment 1

[0026] A low-cost and high-efficiency soft soil curing agent is prepared from the following materials in parts by mass: 35 parts of building demolition mortar powder, 8 parts of alpha crystal nano alumina powder, 12 parts of water glass, 5 parts of liquid resin, 5 parts of water reducing agent, and 5 parts of defoaming agent.

[0027] The water reducer is a polycarboxylic acid water reducer, which is a liquid and has a solid content of 50%; the defoamer is tributyl phosphate; the liquid resin is SJ-30 liquid resin, liquid silicone or liquid epoxy resin; and the average particle size of the alpha crystal nano-alumina powder is 5-20um.

[0028] The preparation method of the low-cost and high-efficiency soft soil solidifying agent comprises the following steps:

[0029] The first step is to pick out plastics, metal objects and wood from the building demolition waste, select the concrete fragments generated during the building demolition process, and then place the selected concrete fragments in an oven at 100-150° C. to bake until the moisture content is less than 2%, grind the obtained product, and pass it through a 200-mesh sieve to obtain building demolition mortar powder;

[0030] In the second step, the building demolition mortar powder, alpha crystal nano alumina powder, water glass, liquid resin, water reducing agent and defoaming agent are mixed in proportion to obtain a low-cost and high-efficiency soft soil solidifying agent.

[0031] The above low-cost and high-efficiency soft soil solidifying agent was installed and mixed into soft soil with a moisture content of 50% in a ratio of 1:1. The overall strength of the solidified soft soil obtained at the age of 28 days was 2.19 MPa.

[0032] Embodiment 2

[0033] A low-cost and high-efficiency soft soil curing agent is prepared from the following materials in parts by mass: 38 parts of building demolition mortar powder, 9 parts of alpha crystal nano alumina powder, 13 parts of water glass, 7 parts of liquid resin, 7 parts of water reducing agent, and 7 parts of defoaming agent.

[0034] The preparation method of the low-cost and high-efficiency soft soil solidifying agent comprises the following steps:

[0035] The first step is to pick out plastics, metal objects and wood from the building demolition waste, select the concrete fragments generated during the building demolition process, and then place the selected concrete fragments in an oven at 100-150° C. to bake until the moisture content is less than 2%, grind the obtained product, and pass it through a 200-mesh sieve to obtain building demolition mortar powder;

[0036] In the second step, the building demolition mortar powder, alpha crystal nano alumina powder, water glass, liquid resin, water reducing agent and defoaming agent are mixed in proportion to obtain a low-cost and high-efficiency soft soil solidifying agent.

[0037] The above low-cost and high-efficiency soft soil solidifying agent was installed and mixed into soft soil with a moisture content of 50% in a ratio of 1:1. The overall strength of the solidified soft soil obtained at the age of 28 days was 2.24 MPa.

[0038] Embodiment 3

[0039] A low-cost and high-efficiency soft soil curing agent is prepared from the following materials in parts by mass: 40 parts of building demolition mortar powder, 10 parts of alpha crystal nano alumina powder, 14 parts of water glass, 8 parts of liquid resin, 8 parts of water reducing agent, and 8 parts of defoaming agent.

[0040] The preparation method of the low-cost and high-efficiency soft soil solidifying agent comprises the following steps:

[0041] The first step is to pick out plastics, metal objects and wood from the building demolition waste, select the concrete fragments generated during the building demolition process, and then place the selected concrete fragments in an oven at 100-150° C. to bake until the moisture content is less than 2%, grind the obtained product, and pass it through a 200-mesh sieve to obtain building demolition mortar powder;

[0042] In the second step, the building demolition mortar powder, alpha crystal nano alumina powder, water glass, liquid resin, water reducing agent and defoaming agent are mixed in proportion to obtain a low-cost and high-efficiency soft soil solidifying agent.

[0043] The above low-cost and high-efficiency soft soil solidifying agent was installed and mixed into soft soil with a moisture content of 50% in a ratio of 1:1. The overall strength of the solidified soft soil obtained at the age of 28 days was 2.14 MPa.

[0044] Comparative Example 1

[0045] A low-cost and high-efficiency soft soil curing agent is prepared from the following materials in parts by mass: 40 parts of building demolition mortar powder, 10 parts of gamma-crystalline alumina powder, 14 parts of water glass, 8 parts of liquid resin, 8 parts of water reducing agent, and 8 parts of defoaming agent.

[0046] The preparation method of the low-cost and high-efficiency soft soil solidifying agent comprises the following steps:

[0047] The first step is to pick out plastics, metal objects and wood from the building demolition waste, select the concrete fragments generated during the building demolition process, and then place the selected concrete fragments in an oven at 100-150° C. to bake until the moisture content is less than 2%, grind the obtained product, and pass it through a 200-mesh sieve to obtain building demolition mortar powder;

[0048] In the second step, the building demolition mortar powder, alpha crystal nano alumina powder, water glass, liquid resin, water reducing agent and defoaming agent are mixed in proportion to obtain a low-cost and high-efficiency soft soil solidifying agent.

[0049] Comparative Example 2

[0050] Soft soil solidifying agent produced by a chemical production company in Wuxi

[0051] The soft soil curing agents obtained in Example 1, Example 2, Example 3 and Comparative Example 1 and Comparative Example 2 were tested for performance, and the specific testing method is as follows:

[0052] The specimens were prepared according to the JTGE30 highway engineering cement and cement concrete test procedures; unconfined compressive strength and splitting strength: the specimens were tested according to the JTJ057 highway engineering inorganic binder stabilized material test procedures. The water stability performance test was tested according to the determination method of rock water stability coefficient in rock mechanics.

[0053] The specific test results are shown in Table 1:

[0054] Table 1 Soft soil curing agent performance test results

[0055] Test items Embodiment 1 Embodiment 2 Embodiment 3 Comparative Example 1 Comparative Example 2 Unconfined compressive strength / MPa 6.2 6.2 6.0 5.4 4.9 Splitting strength / MPa 3.1 3.4 2.9 2.6 2.3 Water stability coefficient / % 92 94 91 84 79

[0056] It can be seen from the test results in Table 1 that the soft soil curing agents prepared in Examples 1, 2 and 3 of the present invention have significantly improved unconfined compressive strength, splitting strength and water stability coefficient compared with the existing product in Comparative Example 2, and the performance of the soft soil curing agents prepared in Examples 1, 2 and 3 is also relatively better than that of the gamma-crystalline alumina powder in Comparative Example 1. Therefore, the soft soil curing agent prepared by the technical solution of the present invention has the characteristics of excellent curing effect and has broad prospects in the development of the hydraulic cementitious material technology industry.

[0057] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A low-cost and high-efficiency soft soil solidifying agent, characterized in that: The soft soil curing agent is made of the following materials in parts by mass: 35-40 parts of building demolition mortar powder, 8-10 parts of alpha crystal nano alumina powder, 12-14 parts of water glass, 5-8 parts of liquid resin, 5-8 parts of water reducing agent, and 5-8 parts of defoaming agent.

2. A low-cost and high-efficiency soft soil solidifying agent according to claim 1, characterized in that: The soft soil curing agent is made of the following materials in parts by mass: 35 parts of building demolition mortar powder, 8 parts of alpha crystal nano-alumina powder, 12 parts of water glass, 5 parts of liquid resin, 5 parts of water reducing agent, and 5 parts of defoaming agent.

3. A low-cost and high-efficiency soft soil solidifying agent according to claim 1, characterized in that: The soft soil curing agent is made of the following materials in parts by mass: 38 parts of building demolition mortar powder, 9 parts of alpha crystal nano-alumina powder, 13 parts of water glass, 7 parts of liquid resin, 7 parts of water reducing agent, and 7 parts of defoaming agent.

4. A low-cost and high-efficiency soft soil solidifying agent according to claim 1, characterized in that: The soft soil curing agent is made of the following materials in parts by mass: 40 parts of building demolition mortar powder, 10 parts of alpha crystal nano-alumina powder, 14 parts of water glass, 8 parts of liquid resin, 8 parts of water reducing agent, and 8 parts of defoaming agent.

5. A low-cost and high-efficiency soft soil solidifying agent according to claim 1, characterized in that: The water reducer is a polycarboxylate water reducer, the polycarboxylate water reducer is liquid, and the solid content of the polycarboxylate water reducer is 50%.

6. A low-cost and high-efficiency soft soil solidifying agent according to claim 5, characterized in that: The defoaming agent is tributyl phosphate.

7. A low-cost and high-efficiency soft soil solidifying agent according to claim 6, characterized in that: The liquid resin is SJ-30 liquid resin, liquid silicone or liquid epoxy resin.

8. A low-cost and high-efficiency soft soil solidifying agent according to claim 7, characterized in that: The average particle size of the alpha crystal nano-alumina powder is 5-20 um.

9. The method for preparing a low-cost and high-efficiency soft soil solidifying agent according to claim 8, characterized in that: The following steps are involved: The first step is to pick out plastics, metal objects and wood from the building demolition waste, select the concrete fragments generated during the building demolition process, and then place the selected concrete fragments in an oven at 100-150° C. to bake until the moisture content is less than 2%, grind the obtained product, and pass it through a 200-mesh sieve to obtain building demolition mortar powder; In the second step, the building demolition mortar powder, alpha crystal nano-alumina powder, water glass, liquid resin, water reducing agent and defoaming agent are mixed in proportion to obtain the low-cost and high-efficiency soft soil curing agent.

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