CN115417652A - Yellow flooding area silt solid waste base soil curing agent and application thereof - Google Patents

Abstract

The invention relates to the technical field of road engineering materials, in particular to a soil curing agent for silt solid waste base in yellow flooding areas and an application thereof. 25-40 parts of blast furnace slag, 25-50 parts of fly ash, 2-15 parts of desulfurized gypsum, 5-15 parts of titanium gypsum, 25-40 parts of ordinary Portland cement, diethanol monoisopropanolamine, in parts by weight It is 1/10,000-18/10,000 of the total dry mass of the powder, and the weight part of the surfactant is 1-10% of the total dry mass of the powder. This paper uses solid waste materials and cement to mix, so that solid waste materials and cement can cooperate with each other to improve the strength of solidified soil; increase the bonding ability of silt materials through titanium gypsum, and reduce the brittleness of materials; The late strength can not only improve the strength of the curing agent itself, but also improve the water stability; at the same time, its low dosage can meet the performance requirements, greatly reducing the cost and effectively protecting the environment.

Description

A kind of silt solid waste base soil stabilizer and its application in yellow flooding area

technical field

The invention relates to the technical field of road engineering materials, in particular to a soil curing agent for silt solid waste base in yellow flooding areas and an application thereof.

Background technique

The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

On the impact plain of the yellow flood zone, the large area of soil is dominated by silt, the strength of the roadbed is low, and construction rolling is very difficult. In order to improve the bearing capacity of the roadbed, it is generally necessary to solidify the roadbed area during road construction, but the existing silt Soil subgrade soil is generally treated with cement and lime as solidification materials for silt solidification, which has problems such as high cost, easy shrinkage and cracking, and imperfect construction technology and quality control of solidified silt. However, the soil curing agents that appear on the market need to be used in conjunction with a large amount of cement, and the cost is relatively high, so it is difficult to promote and use them in the road subgrade construction process. In addition, with the development of science and technology, a large number of industrial solid wastes such as blast furnace slag and fly ash are produced, and the stockpiling of large industrial solid wastes has caused serious environmental pollution and waste of resources. Therefore, the resource utilization of large solid wastes is imminent.

Contents of the invention

Aiming at the problems existing in the prior art, the object of the present invention is to provide a solidifying agent for silt solid waste base soil in the yellow flooding area and its application, which not only solves the problem of the utilization of bulk solid waste, reduces costs, protects the environment, but also through The selection and combination of raw materials can improve the overall strength and water stability performance, and the said pan-area silt solidification waste base soil curing agent has good compressive strength and high water stability coefficient.

In order to achieve the above object, the technical solution of the present invention is as follows:

In the first aspect of the present invention, there is provided a kind of soil curing agent for silt solid waste base in yellow flooding area, which is made up of the following components according to parts by weight:

25-40 parts of blast furnace slag, 25-50 parts of fly ash, 2-15 parts of desulfurized gypsum, 5-15 parts of titanium gypsum, 25-40 parts of ordinary Portland cement, diethanol monoisopropanolamine, parts by weight It is 1/10,000 to 18/10000 of the sum of the dry mass parts of all the powders, and the weight part of the surfactant is 1-10% of the sum of the dry mass of all the powders.

In the second aspect of the present invention, a kind of preparation method of silt solid waste-based green soil curing agent in yellow flooding area is provided:

(1) Blast furnace slag, fly ash, desulfurization gypsum, and titanium gypsum are dried and ground in an oven, and sieved respectively;

(2) Weigh blast furnace slag, fly ash, desulfurized gypsum, and titanium gypsum according to the proportion and carry out dry mixing to obtain a dry mixing mixture, and add diethanol monoisopropanolamine and surfactant into water to make activator and surfactant aqueous solution;

When solidifying the soil, mix the dry mixture with water and stuff, and the stuffing time is in accordance with the "Test Regulations for Highway Engineering Inorganic Binder Stable Materials" (JTGE51-2009); within 1 hour before molding, ordinary silicon Mix salt cement with activator and surfactant aqueous solution.

In the third aspect of the present invention, there is provided an application of the silt solid waste-based green soil curing agent in the yellow flooding area described in the first aspect in soil consolidation.

Specific embodiments of the present invention have the following beneficial effects:

In the solid waste-based green soil solidifying agent for silty soil in the yellow flooding area provided by the present invention, the solid waste material is mixed with cement, so that the solid waste material and cement can cooperate with each other to improve the strength of the solidified soil, and the preparation method is simple and easy to operate .

The blast furnace slag, fly ash and desulfurized gypsum in the present invention use solid waste. Due to the incorporation of solid waste, the strength and performance of the curing agent itself will be weaker than that of cement. In the present invention, the overall strength is mainly improved by stimulating the strength of cement , the present invention adopts diethanol monoisopropanolamine as a cement activator, by stimulating the strength of the cement inside the curing agent, to supplement the part that has been reduced due to the addition of solid waste; adding desulfurized gypsum, increasing the generation of ettringite, and To achieve a better pore filling effect and improve the strength of the modified silt. In addition, there is an ion exchange effect to reduce the thickness of the water film on the surface of the soil particles; a variety of solid waste materials are used according to the material characteristics to maximize the use of The utilization rate of solid waste materials can reduce costs and protect the environment.

In addition, for solid waste-based soil stabilizers, the early strength effect is obvious, but the later strength is not greatly improved. The addition of diethanol monoisopropanolamine increases the content of internal calcium silicate hydrate, which can take into account both early and later strength. Improve the strength of the curing agent itself, improve the water stability; at the same time, the small amount of its addition can meet the performance requirements, greatly reducing the cost.

Titanium gypsum has certain viscosity, the silt cohesion is weak, the content of clay minerals is low, and the problem that the main component is primary minerals can be effectively improved; in addition, the addition of curing agent will make the solidified soil itself show brittle deformation. The addition of gypsum can effectively alleviate the brittle deformation of the modified soil and reduce the cracking of the modified soil.

The green soil solidifying agent material based on silt solid waste in the yellow flooding area provided by the present invention adopts bulk industrial solid wastes such as blast furnace slag and fly ash, and the price is low, which effectively solves the problem of bulk solid waste reduction and utilization, and reduces In addition to the cost of solidifying the soil, compared with 4% cement, the cost reduction is about 1-20%. At the same time, it also effectively protects the environment.

Detailed ways

It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

In one embodiment of the present invention, a kind of silt solid waste base soil curing agent in yellow flooding area is provided, which is made of the following components in parts by weight:

25-40 parts of blast furnace slag, 25-50 parts of fly ash, 2-15 parts of desulfurized gypsum, 5-15 parts of titanium gypsum, 25-40 parts of ordinary Portland cement, diethanol monoisopropanolamine, parts by weight It is 1/10,000-18/10,000 of the total weight of blast furnace slag, fly ash, desulfurized gypsum and ordinary Portland cement. Surfactant, its weight is blast furnace slag, fly ash, desulfurized 1-10% of the total weight of Portland cement.

In some embodiments of the present invention, the blast furnace slag is dried and ground, its particle size is not more than 0.075mm, and its calcium oxide content is about 30-50%; the blast furnace slag is discharged from the blast furnace when smelting pig iron White powdery industrial waste has potential hydraulic gelling properties, and can display hydraulic gelling properties under the action of cement clinker, lime, and gypsum.

In some embodiments of the present invention, the particle size of the fly ash is not greater than 400 mesh, and its main components are silicon dioxide, aluminum oxide, iron oxide, calcium oxide and sulfur trioxide. Among them, the content of calcium oxide is 10-15%. Fly ash is the tiny ash particles discharged during the coal-burning process of thermal power plants. It is the most widely used industrial solid waste at present and has potential hydraulicity.

In some embodiments of the present invention, the desulfurized gypsum is dried, crushed and ground, and its particle size is not greater than 0.075 mm, wherein the content of calcium oxide is 30-50%, and the content of sulfur trioxide is 30-50% %; Desulfurization gypsum is a wet powdery industrial waste obtained during the desulfurization process of coal combustion flue gas in power plants.

In some embodiments of the present invention, the titanium gypsum is in a state of drying, grinding and crushing, with a particle size of 0.1-2 mm.

In some embodiments of the present invention, the model of ordinary Portland cement is one of P.O 42.5, P.O 52.5, and P.O 62.5; further is P.O 42.5.

In some embodiments of the invention, the surfactant is triethanolamine or triisopropanolamine.

The blast furnace slag, fly ash and desulfurized gypsum in the present invention use solid waste. Due to the incorporation of solid waste, the strength and performance of the curing agent itself will be weaker than that of cement. In the present invention, the overall strength is mainly improved by stimulating the strength of cement , two excitation methods are used, one is an organic stimulant, that is, adding diethanol monoisopropanolamine, and the other is a sulfate stimulant, that is, adding desulfurization gypsum. Diethanol monoisopropanolamine is used as the cement activator to stimulate the strength of the cement inside the curing agent, thereby improving the strength of the modified soil; the addition of diethanol monoisopropanolamine increases the content of internal calcium silicate hydrate, which can take both The early and late strength can not only improve the strength of the curing agent itself, but also improve the water stability; at the same time, the small amount of its addition can meet the performance requirements and greatly reduce the cost. Desulfurization gypsum is used as the activator to increase the formation of ettringite, which has a better pore filling effect and improves the strength of the modified silt. In addition, there is an ion exchange effect to reduce the thickness of the water film on the surface of the soil particles; A variety of solid waste materials are utilized according to the characteristics of the materials, and the utilization rate of solid waste materials is maximized to reduce costs and protect the environment. In one embodiment of the present invention, a kind of preparation method of above-mentioned yellow flooding area silt solid waste base soil solidifying agent is provided:

(1) Blast furnace slag, fly ash and desulfurized gypsum are dried and ground in an oven, and screened respectively;

(2) taking blast furnace slag, fly ash, desulfurization gypsum and titanium gypsum according to the proportion and carrying out dry mixing, adding activator diethanol monoisopropanolamine and surfactant into water to make activator-surfactant aqueous solution;

When solidifying the soil, mix blast furnace slag, fly ash, titanium gypsum and desulfurized gypsum with water and stuff, and the stuffing time is in accordance with the "Test Regulations for Highway Engineering Inorganic Binder Stable Materials" (JTGE51-2009); Add ordinary Portland cement, activator, and surfactant aqueous solution within 1 hour before molding.

In one or more embodiments, the drying temperature is selected from 40-150°C.

In the embodiment of the present invention, when the soil is solidified, ordinary Portland cement, activator, and surfactant aqueous solution are mixed within 1 hour before forming, so as to prevent premature hydration of the cement in later construction Loss of strength occurs in the process.

In one embodiment of the present invention, an application of the above-mentioned silt solid waste-based green soil curing agent in yellow flooding areas is provided in soil curing.

The present invention will be further explained and illustrated below in conjunction with specific embodiments.

Example 1

A kind of soil stabilizer for the special soil quality of the yellow flood zone, its raw material formula is as follows in terms of mass fraction:

33 parts of ordinary Portland cement, 33 parts of blast furnace slag, 34 parts of fly ash, 2 parts of desulfurized gypsum, 5 parts of titanium gypsum; 0.01 part of diethanol monoisopropanolamine, 2 parts of triethanolamine;

The solid waste materials blast furnace slag, fly ash, desulfurization gypsum and titanium gypsum are all dried in an oven, the drying temperature is selected at 40°C, and the solid waste materials blast furnace slag, fly ash and desulfurization gypsum after drying are used in a planetary ball mill Grind and sieve separately;

Blast furnace slag, fly ash, titanium gypsum, and desulfurized gypsum are weighed according to a certain proportion, and dry-mixed first, and the rest of the activator and surfactant are added to part of the water to make a diluted aqueous solution of the activator and surfactant. When the body is solidified, the dry material is mixed with water for stuffing. The stuffing time is in accordance with the "Test Regulations for Highway Engineering Inorganic Binder Stable Materials" (JTGE51-2009). Strength loss occurs during the process, so the cement and the diluted activator surfactant aqueous solution are mixed in within 1 hour before molding.

Example 2

A kind of soil stabilizer for the special soil quality of the yellow flood zone, its raw material formula is as follows in terms of mass fraction:

40 parts of ordinary Portland cement, 40 parts of blast furnace slag, 20 parts of fly ash, 5 parts of desulfurized gypsum, 10 parts of titanium gypsum; 0.08 parts of diethanol monoisopropanolamine, 5.8 parts of triisopropanol;

The preparation method is as follows: the solid waste materials blast furnace slag, fly ash, titanium gypsum, and desulfurized gypsum are all dried in an oven, and the drying temperature is selected to be 80°C. After drying, the solid waste materials blast furnace slag, titanium gypsum, and fly ash and desulfurized gypsum are ground by a planetary ball mill and screened separately;

Blast furnace slag, fly ash, titanium gypsum, and desulfurized gypsum are weighed according to a certain proportion, and dry-mixed first, and the activator diethanol monoisopropanolamine and surfactant triisopropanol are added to part of the water to make the activator, When the aqueous solution diluted with surfactant is used to solidify the soil, the dry material is mixed with water for stuffing, and the stuffing time is in accordance with the "Test Regulations for Highway Engineering Inorganic Binder Stable Materials" (JTGE51-2009); Mix the cement with the diluted aqueous solution of diethanol monoisopropanolamine surfactant within the first 1 hour.

Example 3

A kind of soil stabilizer for the special soil quality of the yellow flood zone, its raw material formula is as follows in terms of mass fraction:

40 parts of ordinary Portland cement, 20 parts of blast furnace slag, 15 parts of desulfurized gypsum, 30 parts of fly ash, 15 parts of titanium gypsum, 0.05 parts of diethanol monoisopropanolamine, 5.8 parts of triethanolamine;

The preparation method is as follows: the solid waste materials blast furnace slag, fly ash, titanium gypsum and desulfurized gypsum are all dried in an oven, and the drying temperature is selected to be 105°C. After drying, the solid waste materials blast furnace slag, fly ash and desulfurized gypsum Use a planetary ball mill to grind and sieve them separately;

Blast furnace slag, fly ash, titanium gypsum and desulfurized gypsum are weighed according to a certain ratio and firstly dry-mixed, and the activator diethanol monoisopropanolamine and surfactant triethanolamine are added to part of the water to make activator, surface active When solidifying the soil, mix the dry mixture with water for stuffing. The stuffing time is in accordance with the "Test Regulations for Highway Engineering Inorganic Binder Stable Materials" (JTGE51-2009); before forming Mix the cement and the diluted aqueous solution of diethanol monoisopropanolamine surfactant within 1 hour.

Comparative example 1 ( without adding diethanol monoisopropanolamine)

40 parts of ordinary Portland cement, 20 parts of blast furnace slag, 15 parts of desulfurization gypsum, 30 parts of fly ash, 15 parts of titanium gypsum, 5.8 parts of triethanolamine;

The preparation method is as follows: the solid waste materials blast furnace slag, fly ash, titanium gypsum and desulfurized gypsum are all dried in an oven, and the drying temperature is selected at 40 ° C. After drying, the solid waste materials blast furnace slag, fly ash, titanium gypsum and desulfurized gypsum are ground by a planetary ball mill and screened separately;

Blast furnace slag, fly ash, titanium gypsum and desulfurized gypsum are weighed according to a certain proportion and firstly dry-mixed, and the surfactant triethanolamine is added to part of the water to make an aqueous solution diluted with activator and surfactant, and the soil is subjected to When curing, mix the dry mixture with water for stuffing, and the stuffing time is in accordance with the "Test Regulations for Highway Engineering Inorganic Binder Stable Materials" (JTGE51-2009); within 1 hour before molding, mix the cement with the diluted surface active Stir in the aqueous solution.

Comparative example 2 ( replacing the activator diethanol monoisopropanolamine with quicklime or sodium hydroxide)

40 parts of ordinary Portland cement, 20 parts of blast furnace slag, 15 parts of desulfurized gypsum, 30 parts of fly ash, 15 parts of titanium gypsum, 5.8 parts of triethanolamine; 5 parts of quicklime and sodium hydroxide;

The preparation method is as follows: the solid waste materials blast furnace slag, fly ash, titanium gypsum and desulfurized gypsum are all dried in an oven, and the drying temperature is selected at 40 ° C. After drying, the solid waste materials blast furnace slag, fly ash, titanium gypsum and desulfurized gypsum are ground by a planetary ball mill and screened separately;

The blast furnace slag, fly ash, titanium gypsum and desulfurization gypsum are weighed according to a certain proportion and firstly dry-mixed, and the activator quicklime or sodium hydroxide and the surfactant triethanolamine are added to part of the water to make the activator and the surfactant to dilute When the final aqueous solution is solidified on the soil, the dry mix mixture is mixed with water for stuffing, and the stuffing time is in accordance with the "Test Regulations for Highway Engineering Inorganic Binder Stable Materials" (JTGE51-2009); within 1 hour before forming Mix cement, quicklime, diluted sodium hydroxide and surfactant aqueous solution.

The soil solidifying agent of embodiment 1-embodiment 3 gained is carried out performance detection, and concrete detection method is as follows:

Determination of unconfined compressive strength:

Take a representative soil sample and divide it evenly into 3 parts, and add the soil curing agent of Example 1-Example 3 into the 3 equal parts of soil respectively, the specific mass ratio is 5% soil curing agent and 95% soil sample. Refer to the "Test Regulations for Highway Engineering Inorganic Binder Stable Materials" (JTGE51-2009), make a cylindrical sample with diameter × height = 50mm × 50mm, at a temperature of 20°C ± 2°C, and a relative humidity of 95%. Under the above conditions, the unconfined compressive strength of 7 days after moisturizing for 6 days and immersion in water for 1 day, the water stability coefficient is measured according to the provisions of CJ/T 486 of "Soil Solidification Admixture", and its value is at a temperature of 20 ℃±2℃, relative humidity above 95%, the 7d unconfined compressive strength after moisturizing for 6 days and immersion in water for 1 day Ratio of unconfined compressive strength after 7 days of health preservation. The test results are shown in Table 1:

As can be seen from Table 1, the unconfined compressive strength of the soil solidifying agent obtained by the embodiment of the present invention and the unconfined compressive strength of the test piece after 7d standard curing are higher, and the water stability coefficient is higher, stronger than comparative example 1 and 2 obtained soil stabilizer. And the consumption of diethanol monoisopropanolamine is extremely small, and its strength can be improved.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. The yellow flooding area silt solid waste base soil curing agent is characterized by comprising the following components in parts by weight:

25-40 parts of blast furnace slag; 25-50 parts of fly ash; 2-15 parts of desulfurized gypsum; 5-15 parts of titanium gypsum; 25-40 parts of ordinary portland cement; the weight portion of the diethanol monoisopropanolamine is one ten thousandth to eighteen ten thousandth of the total dry mass of the powder; the weight portion of the surfactant is 1-10% of the total dry mass of the powder.

2. The yellow flood area silt solid waste base soil solidifying agent according to claim 1, wherein the blast furnace slag is in a dried and ground state and has a particle size of not more than 0.075mm and a calcium oxide content of about 30-50%.

3. The yellow flood area silt solid waste base soil solidifying agent according to claim 1, wherein the particle size of the fly ash is not more than 400 meshes, and the main components are silicon dioxide, aluminum oxide, ferric oxide, calcium oxide, sulfur trioxide and the like; wherein the content of calcium oxide is 10-15%.

4. The yellow pan silt solid waste base soil solidifying agent according to claim 1, wherein the desulfurized gypsum is in a state of being dried, crushed and ground, and has a particle size of not more than 0.075mm, wherein the content of calcium oxide is 30-50%, and the content of sulfur trioxide is 30-50%.

5. The yellow pan soil silt solid waste base soil solidifying agent according to claim 1, wherein the type of the ordinary portland cement is one of p.o 42.5, p.o 52.5 and p.o 62.5; further, p.o 42.5.

6. The yellow flood zone silt solid waste base soil solidifying agent according to claim 1, wherein the surfactant is triethanolamine or triisopropanolamine.

7. A method for preparing the yellow river district silt solid waste base soil solidifying agent according to any one of claims 1 to 6, which is characterized by comprising the following steps:

(1) Drying and grinding the blast furnace slag, the fly ash, the desulfurized gypsum and the titanium gypsum by using an oven, and respectively carrying out sieving treatment;

(2) Weighing blast furnace slag, fly ash, desulfurized gypsum and titanium gypsum according to a proportion, carrying out dry mixing to obtain a dry-mixed mixture, and adding diethanol monoisopropanolamine and a surfactant into water to prepare an excitant-surfactant aqueous solution;

when the soil body is solidified, mixing the dry-mixed mixture with water and sealing the materials, wherein the sealing time is operated according to the test regulation of inorganic binder stable materials for highway engineering (JTGE 51-2009); and mixing the ordinary Portland cement, the excitant and the surfactant aqueous solution within 1 hour before forming.

8. The method of claim 8, wherein the drying temperature is selected from 40 ℃ to 150 ℃.

9. The use of the yellow-flooding region silt solid waste base soil solidifying agent of any one of claims 1 to 7 in soil solidification.