CN115745549A - Sludge curing agent - Google Patents

Abstract

The invention discloses a silt curing agent, which is applied to the foundation construction of high-water-content areas and comprises a main curing agent and an exciting agent; wherein the main curing agent comprises, by mass, 4-10 parts of mineral powder and 1.6-2.8 parts of cement; the excitant comprises 0.1 to 1 portion of sodium sulfate, 0.05 to 0.24 portion of sodium hydroxide, 0 to 18 portions of water absorption resin, 0 to 20 portions of foaming agent, 0 to 2.5 portions of magnesium sulfate, 0 to 3.5 portions of high-strength fiber, 1.4 to 2 portions of lime and 0.3 to 2.1 portions of dihydrate gypsum; the components can be selected according to the water content of the soil, and the specific mass fraction is selected, wherein the index of the water content of the soil is 15-80%. The curing agent can be applied to soil environments with different water contents, can be used for curing operation, saves construction time, reduces the working time of professional technicians on site, and has the advantages of low dosage and low cost, and the mixing amount of the curing agent is only about five percent of the mass of in-situ soil.

Description

a sludge solidifier

technical field

The invention relates to a sludge solidifying agent.

Background technique

The traditional roadbed construction technology is to dig out the original silt or soft foundation soil of the roadbed, replace it with a certain proportion of ash soil (the composition is quicklime plus high-quality soil), and mix the ash soil and water (the ratio of adding water is determined by experiment. The optimal moisture content of the soil is the basis for the dosage), and the lime soil layer is compacted and laid into a roadbed.

The materials required in this process are lime and soil. Lime is the solidification material, and the soil needs to be replaced. The in-situ soil cannot be used directly, which causes a waste of in-situ soil resources, and the transportation and purchase of new soil lead to construction costs. increase and affected the construction period. In addition, the amount of water required for the solidification reaction of lime soil is required. Too much or too little water will have a significant impact on the construction effect. If the strength of the laid roadbed reaches the national standard, the amount of water needs to be strictly controlled, so construction The process requirements are higher, and the construction cost will be increased virtually.

At the same time, in order to increase the utilization rate of the original soil, the existing research adopts the method of blending and curing to directly treat and solidify the original soil, so as to obtain the foundation conditions whose curing strength meets the use standard, but this method is not suitable for use in areas with more silt The effect is not ideal, and there are certain problems in its curing strength and curing efficiency.

Contents of the invention

The purpose of the present invention is to provide a kind of sludge curing agent in order to solve the above deficiencies in the prior art.

A sludge curing agent, which is used in foundation construction in areas with high water content, including main curing agent and activator;

In parts by mass, the main curing agent includes 4-10 parts of mineral powder and 1.6-2.8 parts of cement;

In parts by mass, the activator includes 0.1-1 parts of sodium sulfate, 0.05-0.24 parts of sodium oxide, 0-18 parts of water-absorbing resin, 0-20 parts of foaming agent, 0-2.5 parts of magnesium sulfate, 0- 3.5 parts of high-strength fiber, 1.4-2 parts of lime, 0.3-2.1 parts of dihydrate gypsum;

The specific mass fractions of the above components are selected according to the water content of the soil, wherein the index of the water content of the soil is 15% to 80%.

The effect of each component of the present invention:

Mineral powder: It is used to replace cement to solidify soft soil, and at the same time save the amount of cement and reduce the cost.

Cement: The function is to solidify the weak soil and act as a gel.

Sodium sulfate: stimulate the activity of mineral powder cement, accelerate the hydration reaction, and reduce the construction period.

Sodium hydroxide: The function is to react with the moisture in the soil, neutralize the moisture, and reduce the moisture content.

Water-absorbing resin: Water-absorbing resin has a strong water-absorbing capacity, can absorb water 30-200 times its own mass, and can quickly absorb water in a short period of time.

Foaming agent: The type of foaming agent selected in the present invention is vegetable protein foaming agent, and its function is to reduce the weight of the roadbed without losing strength.

Magnesium sulfate: As a flocculant, its biggest role is to purify soil moisture, and secondly, it can absorb water.

High-strength fiber: its function is to enhance the early strength of the solidified soil. High-strength fiber can choose one or more of the following:

Polyphthalamide p-phenylene diamine fiber (Kevlar), aramid copolymer fiber (HM-50), heterocyclic polyamide fiber (ΒниивлонСBM), carbon fiber (Carbon fiber: Torayca), graphite fiber (M40), Silicon carbide fiber etc.

Lime: water absorbing agent, plays a role in reducing moisture content.

Dihydrate gypsum: It acts as a retarding effect on the curing material, prolongs the reaction time of the curing agent, and leaves sufficient time for construction.

The following table shows the dosage of each curing agent component:

Among them, the content of water-absorbing resin n water-absorbing resin, soil water content is N; when N is less than 35%, the specific content of n water-absorbing resin is 0, and the water absorption at this time is provided by the main curing agent; when N is greater than 35%, n The mass fraction of the water-absorbing resin is gradually increased from 0 to 18, and it is used for the absorption of moisture in the original soil.

The specific steps of using the curing agent are as follows:

Before construction, the main curing agent in the curing agent is mixed with the activator, and evenly distributed on the surface of the soil to be cured by sprinkling, and then the soil and the curing agent are stirred by on-site mechanical equipment.

When stirring, it is supplemented by a certain amount of water, wherein the mass fraction of the supplemented water is related to the water content of the soil, and the quality of the supplemented water is (12-15%)*(the total mass of the curing agent+the total mass of the soil after dehydration).

The raw materials of the curing agent are cement, quicklime, mineral powder, dihydrate gypsum, etc. These raw materials are relatively easy to obtain in the market, and according to the previous experimental data, adding about 8% of the total mass of the curing agent can achieve good curing Effect. Therefore, the cost of raw materials is not high.

The production of the curing agent only needs to be accurately added according to the ratio of the raw materials obtained in the experiment, and then the dry powder is stirred to complete the production process. This soil curing agent does not burn or explode, and can be stored at room temperature for more than one year.

Beneficial effect:

In the present invention, by limiting the usage amount of each component and using inorganic materials such as water-absorbing resin and foaming agent for application, the application range of the curing agent can be greatly improved, so that it can be applied to soils in various environments. expand its applicability.

Secondly, through on-site construction and spraying, the construction period of soil solidification can be greatly shortened, and the time for filling replacement can be saved. At the same time, the hydration reaction of the curing agent is faster, and the bearing strength can be achieved on the day of construction. At the same time, the use of labor is reduced, and the construction control is convenient. The construction only needs to be simply stirred evenly and fully compacted, and the demand for large machinery is small.

Description of drawings

Fig. 1 is the schematic diagram after the surface curing of the curing agent prepared in embodiment one;

Fig. 2 is a schematic diagram of the cured side of the curing agent prepared in Example 1 after curing.

Detailed ways

In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with the embodiments and accompanying drawings. The embodiments are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

Embodiment one:

Among them, the soil moisture content is 15%, and the ratio of each component is as follows:

4 parts of mineral powder, 1.60 parts of cement, 0.10 parts of sodium sulfate, 0.05 parts of sodium hydroxide, 0 parts of water-absorbing resin, 0 parts of foaming agent, 0 parts of magnesium sulfate, 0 parts of high-strength fiber, 1.40 parts of lime, 0.30 parts of dihydrate gypsum .

Calculate the total amount of soil that needs to be constructed, sprinkle it evenly according to the ratio of curing agent, add water (the amount of water added is roughly 13% of the total amount of soil plus curing agent through previous experiments), and mix the soil and curing agent with water through on-site mechanical equipment Compaction can be completed, and it can be evenly stirred by simple stirring and fully compacted.

Embodiment two:

Among them, the soil moisture content is 25%, and the ratio of each component is as follows:

6 parts of mineral powder, 2 parts of cement, 0.10 part of sodium sulfate, 0.08 part of sodium hydroxide, 0 part of water-absorbing resin, 0 part of foaming agent, 0 part of magnesium sulfate, 0 part of high-strength fiber, 1.60 part of lime, 0.60 part of dihydrate gypsum . The remaining parts are the same as in Example 1.

Embodiment three:

Among them, the soil moisture content is 35%, and the ratio of each component is as follows:

8 parts of mineral powder, 2.40 parts of cement, 0.20 parts of sodium sulfate, 0.11 parts of sodium hydroxide, 10 parts of water-absorbing resin, 12 parts of foaming agent, 0.50 parts of magnesium sulfate, 1.50 parts of high-strength fiber, 1.80 parts of lime, 0.90 parts of dihydrate gypsum . The remaining parts are the same as in Example 1.

Embodiment four:

Among them, the soil moisture content is 45%, and the ratio of each component is as follows:

10 parts of mineral powder, 2.80 parts of cement, 0.40 parts of sodium sulfate, 0.14 parts of sodium hydroxide, 12 parts of water-absorbing resin, 14 parts of foaming agent, 1 part of magnesium sulfate, 2 parts of high-strength fiber, 2 parts of lime, 1.20 parts of dihydrate gypsum . The remaining parts are the same as in Example 1.

Embodiment five:

Among them, the soil moisture content is 55%, and the ratio of each component is as follows:

10 parts of mineral powder, 2.80 parts of cement, 0.60 parts of sodium sulfate, 0.17 parts of sodium hydroxide, 14 parts of water-absorbing resin, 16 parts of foaming agent, 1.50 parts of magnesium sulfate, 2.50 parts of high-strength fiber, 2 parts of lime, 1.50 parts of dihydrate gypsum . The remaining parts are the same as in Example 1.

Embodiment six:

Among them, the moisture content of the soil is 65%, and the ratio of each component is as follows:

10 parts of mineral powder, 2.80 parts of cement, 0.80 parts of sodium sulfate, 0.21 parts of sodium hydroxide, 16 parts of water-absorbing resin, 18 parts of foaming agent, 2 parts of magnesium sulfate, 3 parts of high-strength fiber, 2 parts of lime, 1.80 parts of dihydrate gypsum . The remaining parts are the same as in Example 1.

Embodiment seven:

Among them, the moisture content of the soil is 75%, and the ratio of each component is as follows:

10 parts of mineral powder, 2.80 parts of cement, 1 part of sodium sulfate, 0.24 parts of sodium hydroxide, 18 parts of water-absorbing resin, 20 parts of foaming agent, 2.50 parts of magnesium sulfate, 3.50 parts of high-strength fiber, 2 parts of lime, 2.10 parts of dihydrate gypsum . The remaining parts are the same as in Example 1.

The following table is the detection report of the 7d unconfined strength of Examples 1 to 7.

moisture content 7D Unconfined Strength 15% 2.3Mpa 25% 1.8Mpa 35% 1.6Mpa 45% 1.5Mpa 55% 1.3Mpa 65% 1.1Mpa 75% 1Mpa

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

Claims (7)

1. A silt curing agent is applied to the foundation construction of a high-water-content area and is characterized by comprising a main curing agent and an exciting agent;

the main curing agent comprises, by mass, 4-10 parts of mineral powder and 1.6-2.8 parts of cement;

according to the mass parts, the excitant comprises 0.1 to 1 part of sodium sulfate, 0.05 to 0.24 part of sodium hydroxide, 0 to 18 parts of water-absorbing resin, 0 to 20 parts of foaming agent, 0 to 2.5 parts of magnesium sulfate, 0 to 3.5 parts of high-strength fiber, 1.4 to 2 parts of lime and 0.3 to 2.1 parts of dihydrate gypsum;

the components are selected according to the specific mass fraction of the soil moisture content, wherein the index of the soil moisture content is 15-80%.

2. The sludge curing agent as claimed in claim 1, wherein the content n of the water-absorbent resin is _{Water-absorbing resin} The water content of the soil is N; wherein when N is less than 35%, N _{Water-absorbing resin} The specific content of (A) is 0; when N is greater than 35%, N _{Water-absorbing resin} The mass fraction of (A) is gradually increased from 0 part to 18 parts.

3. The sludge curing agent as claimed in claim 1, wherein the curing agent is prepared by the following steps:

before construction, main curing agent and exciting agent in the curing agent are mixed and uniformly distributed on the surface of soil to be cured in a scattering mode, and then the soil and the curing agent are stirred by on-site mechanical equipment.

4. A sludge curing agent according to claim 3 wherein during agitation, a quantity of water is added to supplement the mixture, the quantity of water supplemented being (12-15%) by mass (total mass of curing agent + total mass of soil after dewatering).

5. The sludge curing agent as claimed in claim 1 or 4, wherein the curing agent is added in an amount of 6 to 10% by mass based on the total mass of the soil.

6. The sludge curing agent as claimed in claim 1, wherein the stirred soil containing the curing agent is subjected to paving, compacting and aging treatment in sequence.

7. The sludge curing agent as claimed in claim 1, wherein in the production of the curing agent, the main curing agent and the activator are mixed by a dry powder stirring method, and the mixture is sealed and stored.

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