Foaming agent for cast-in-place foam light soil, foam light soil and preparation method of foam light soil

Abstract

The invention relates to the technical field of foaming, and mainly relates to a foaming agent for cast-in-situ foamed light soil, the foamed light soil and a preparation method of the foamed light soil. The foaming agent for the cast-in-place foam light soil comprises an agent A and an agent B, the agent A comprises the following components in percentage by mass: 20-40% of a foaming component, 4-8% of a foam stabilizing component, 6-12% of a solubilizing component and the balance of water; and the agent B comprises the following components in percentage by mass: 10-30% of a thickening component, 15-45% of a synergistic component and 30-60% of a dispersing component. According to the foaming agent for the cast-in-place foam light soil, the foam structure can be stabilized after the foam light soil is prepared, the smaller foam size and the higher foam stability are obtained, and therefore the mechanical property of the foam light soil is improved.

Description

Technical Field

[0001] The present application relates to the field of foaming technology, and mainly to a foaming agent for cast-in-place foam lightweight soil, foam lightweight soil and a preparation method thereof. Background Art

[0002] Foamed lightweight soil is a semi-solid porous material that uses cement as the main cementitious material, mineral powder, fly ash and stone powder as admixtures, and is mixed with relatively stable foam. After hardening, foamed lightweight soil has a large number of spherical foam pores, which makes it lightweight and load-reducing, heat-insulating and warm-keeping, sound-proof and fire-proof, anti-corrosion and moisture-proof, and non-toxic and harmless. The volume proportion of pores in foamed lightweight soil can generally reach more than 50%, which is one of the decisive factors for the structural strength of the material. Therefore, obtaining a better pore structure is an important means to improve the strength of foamed lightweight soil, especially foamed lightweight soil with a large pore proportion.

[0003] According to the definition of the standard "CJJT177-2012 Bubble Mixed Lightweight Soil Filling Engineering Technology", the foaming agent is a surfactant material that can produce bubble groups, and the foaming liquid is a liquid that is directly used for foaming after the foaming agent is diluted. According to the existing products on the market and the existing research results, the working principle of the foaming agent is: the surfactant reduces the surface tension of water, forms a liquid film covered with anionic surfactants to wrap the bubbles, and uses a foam stabilizer to enhance the connection between the surfactants, thereby obtaining a relatively stable foam structure, and then adding a thickener to slow down the foam seepage and foam merging. At present, the foaming agents disclosed in the prior art often have usage restrictions and cannot meet the requirements of cast-in-place construction well. The foaming liquid disclosed in Chinese invention patent CN117902850A includes: 5% vegetable protein, 0.2% xanthan gum, 0.05% silica fume, 0.025% nano silicon dioxide, 0.15% hydroxypropyl methylcellulose and 0.025% sodium lauryl sulfate. The foaming liquid is characterized by using vegetable protein and sodium lauryl sulfate for foaming, nano silicon dioxide as a stabilizer, and hydroxypropyl methylcellulose and xanthan gum as thickeners. However, in the production practice of pouring large-volume foamed lightweight soil, the production speed of lightweight soil is 60-100m 3 / h, the amount of foaming liquid required is about 2000-3000kg / h, and hydroxypropyl methylcellulose, xanthan gum and nano-silicon dioxide all need to be stirred quickly and added slowly, which greatly affects the smoothness of production. This solution directly uses a small amount of raw materials to dissolve in water to prepare the foaming liquid. In actual production, when the dosage is increased, there will be cumbersome operations. The test results do not reflect the necessity of using vegetable protein and sodium dodecyl sulfate for foaming at the same time, nor can they clarify the significance of using xanthan gum and hydroxypropyl methylcellulose for thickening at the same time. The foaming liquid obviously cannot cope with the application scenario of cast-in-place. The foaming liquid disclosed in Chinese invention patent CN118047577A includes: 2~5 parts of foaming agent, 0.5~1.5 parts of foam stabilizer, and 180~220 parts of water, wherein the foaming agent is sodium dodecyl sulfate (K12), and the foam stabilizer is silicone polyether emulsion (MPS). The foaming performance of sodium dodecyl sulfate used in this foaming agent system is relatively general, and no thickener is used to slow down the deterioration of foam. The foaming agent disclosed in the Chinese invention patent CN118373703A includes: sodium lauryl polyoxyethylene ether sulfate 38.4-57.6wt%, sodium α-olefin sulfonate 15.2-22.8wt%, sodium dodecyl sulfate 4-6wt%, lauryl amide propyl betaine-LAB 7.2-10.8wt%, water 12.8-19.2wt%, triethanolamine 2.4-3.6wt%. The foaming agent also does not have a foam stabilizing component and a thickening component. It can be seen that the current existing foaming agent technical solution should be more effective in adding a thickening agent in addition to the traditional "foaming component + foam stabilizing component", which can effectively control the foam size and inhibit foam seepage. However, thickeners are not widely used in actual production. Direct participation in foaming will affect the foaming effect. When used, they generally need to be added to the foaming agent liquid, and cannot be directly used as a product component of the foaming agent on site. At the same time, the post-addition of thickeners or nanomaterials also requires slow addition while rapid stirring. This addition method also increases manual / mechanical processes and cannot be well applied to cast-in-place construction. Therefore, the existing technology needs to be improved and developed. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a foaming agent for cast-in-place foam lightweight soil, foam lightweight soil and a preparation method thereof, aiming to solve the problem that the existing method of adding thickeners to foaming agents is cumbersome to operate and imposes restrictions on cast-in-place construction.

[0005] The technical solution of this application is as follows: In a first aspect, the present application provides a foaming agent for cast-in-place foam lightweight soil, which includes agent A and agent B; The agent A comprises the following components calculated by mass percentage: The foaming component is 20%-40%, the foam stabilizing component is 4%-8%, the solubilizing component is 6%-12%, and the balance is water; The agent B comprises the following components calculated by mass percentage: Thickening component 10%-30%, synergistic component 15%-45%, dispersing component 30%-60%.

[0006] By combining the A and B agents provided in this application for foaming, the foam generation advantages of the A agent and the foam stabilization ability of the B agent can be brought into play respectively. The synergistic component used in the B agent will increase the foam stability, while the thickening component can make the foam size smaller and the roundness lower, which is more conducive to improving the structural strength of the foam lightweight soil, and helps the lightweight soil to have a small density change in the vertical direction of a single pouring and a uniform strength distribution. After configuring the foam lightweight soil, the foam structure can be stabilized, a smaller foam size and higher foam stability can be obtained, thereby increasing the mechanical properties of the foam lightweight soil.

[0007] Furthermore, the foaming component is a combination of sodium lauryl polyoxyethylene ether sulfate and sodium α-olefin sulfonate, and the mass proportion of sodium lauryl polyoxyethylene ether sulfate in the A agent is 8%-16%; The mass proportion of the sodium α-olefin sulfonate in the agent A is 12%-24%.

[0008] Furthermore, the mass ratio of the sodium lauryl polyoxyethylene ether sulfate to the sodium α-olefin sulfonate is 2:3.

[0009] Furthermore, the foam stabilizing component is a silicone polyether emulsion; The solubilizing component is a white water-proof solvent.

[0010] Furthermore, the thickening component is hydroxypropyl methylcellulose.

[0011] Furthermore, the synergistic component is a combination of lipophilic modified nano-silica and sodium polycarboxylate, the mass proportion of the lipophilic modified nano-silica in the B agent is 10%-25%, and the mass proportion of the sodium polycarboxylate in the B agent is 5%-20%.

[0012] Furthermore, the dispersing component is triethanolamine.

[0013] In a second aspect, the present application further provides a method for preparing a foaming agent for cast-in-place foam lightweight soil as described in the first aspect, wherein the method comprises the following steps: Prepare the A agent and the B agent respectively; The preparation method of the agent A comprises the following steps: Add water to the container, add the foaming component, stir for 30-90 minutes to dissolve, then add the solubilizing component and the foam stabilizing component, continue stirring for 15-45 minutes to obtain the A agent; The preparation method of the agent B comprises the following steps: The thickening component and the synergistic component are added into a container, and then the dispersing component is added, and the mixture is stirred for 5-15 minutes to obtain the agent B.

[0014] In a third aspect, the present application also provides a foamed lightweight soil, wherein the foamed lightweight soil uses the foaming agent for cast-in-place foamed lightweight soil as described in the first aspect as a foaming agent.

[0015] Furthermore, the foamed lightweight soil is prepared by the following preparation method: Prepare gelling slurry; Mixing the agent B with dilution water to obtain a foaming agent liquid; After adding the agent A to the foaming agent liquid and mixing, the foaming agent liquid is foamed to obtain foam, and the foam is mixed with a gelling slurry to obtain a raw material for foamed lightweight soil; The ratio of agent B to dilution water is 1:100-200 (kg / L); The volume ratio of the A agent to the foaming agent liquid is 1:50; Alternatively, the foamed lightweight soil is prepared by the following preparation method: Prepare gelling slurry; The A agent and the B agent are mixed, and then diluted with water to obtain a foaming agent liquid; The foaming agent is foamed with liquid to obtain foam, and the foam is mixed with gelling slurry to obtain the raw material of foamed lightweight soil; The ratio of agent B to dilution water is 1:100-200 (kg / L); The volume ratio of agent A to dilution water is 1:50.

[0016] Beneficial effect: This application concentrates the components that reduce surface activity and produce high-quality foam in agent A, and concentrates the raw materials that are not easily dispersed in water in agent B, so that they can be concentrated and quickly dissolved and dispersed during foaming. These raw materials are thickening components and synergistic components that need to be added quickly and stirred slowly. The solubilizing components help to disperse, reduce the difficulty of configuration, improve the foaming efficiency while ensuring the foam performance, and reduce the labor and time required. The foam of the foaming agent for cast-in-place foam lightweight soil can stabilize the foam structure after participating in the configuration of foam lightweight soil, obtain smaller foam size and higher foam stability, thereby increasing the mechanical properties of foam lightweight soil. DETAILED DESCRIPTION

[0017] The present application provides a foaming agent for cast-in-place foam lightweight soil, foam lightweight soil and a preparation method thereof. To make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] The present application provides a foaming agent for cast-in-place foam lightweight soil, which includes agent A and agent B; Agent A, calculated by mass percentage, includes the following components: The foaming component is 20%-40%, the foam stabilizing component is 4%-8%, the solubilizing component is 6%-12%, and the balance is water; Agent B, calculated by mass percentage, includes the following components: Thickening component 10%-30%, synergistic component 15%-45%, dispersing component 30%-60%.

[0019] Among them, the ratio of agent B to agent A is 1:2-4 (kg / L).

[0020] By using the foaming agent provided in the present application, the foam structure can be stabilized after the foam lightweight soil is prepared, and a smaller foam size and higher foam stability can be obtained, thereby increasing the mechanical properties of the foam lightweight soil.

[0021] By combining the Agent A and Agent B provided in the present application for foaming, the foam generation advantage of Agent A and the foam stabilization ability of Agent B can be brought into play respectively. According to previous studies and observations, under the same volume parameters, compared with using a foaming agent alone, the synergistic component used in Agent B will increase the foam stability, while the thickening component can make the foam size smaller and the roundness lower, which is more conducive to improving the structural strength of the foamed lightweight soil, and helps to reduce the density change of the lightweight soil in the vertical direction of a single pouring and uniform strength distribution.

[0022] Furthermore, the foaming component is a combination of sodium lauryl polyoxyethylene ether sulfate and sodium α-olefin sulfonate, the mass proportion of sodium lauryl polyoxyethylene ether sulfate in Agent A is 8%-16%, and the mass proportion of sodium α-olefin sulfonate in Agent A is 12%-24%.

[0023] In the present application, the selected sodium α-olefin sulfonate (AOS) has the characteristics of high foaming ratio and fine foam, and is the main body of the foaming agent. The selected sodium lauryl polyoxyethylene ether sulfate (AES) also has good foaming performance. Specifically, sodium α-olefin sulfonate and sodium lauryl polyoxyethylene ether sulfate are both anionic surfactants with good solubility, high stability in the required use environment, and strong alkali resistance. After mixing to form light soil, it also helps to maintain the foam effect. Moreover, the low critical micelle concentration of sodium α-olefin sulfonate and sodium lauryl polyoxyethylene ether sulfate is appropriate and similar, about 2.00×10 -3 -3.00×10 -3 mol / L -1 The synergistic effect is good, and the non-polar ends can form mixed micelles, which can effectively reduce the surface tension. The combined use can further improve the foaming effect.

[0024] Furthermore, the mass ratio of sodium lauryl polyoxyethylene ether sulfate to sodium α-olefin sulfonate is 2:3.

[0025] In the present application, sodium α-olefin sulfonate is used as the foaming main body. Too little use will lead to a decrease in the dilution ratio, an increase in the amount of foaming agent used per unit of foaming liquid, and an increase in the use cost of the foaming agent. Too much use will affect the synergistic effect of the foaming combination and the foam stability will deteriorate. The present application has been verified through experiments that the mass ratio of sodium lauryl polyoxyethylene ether sulfate and sodium α-olefin sulfonate is controlled at 2:3. Under this ratio, it has good foam stability and has a good synergistic effect with the silicone resin polyether emulsion in the foam stabilizing component, which improves the stability while ensuring the foam effect.

[0026] Furthermore, the foam stabilizing component is a silicone polyether emulsion.

[0027] In this application, the selected silicone resin polyether emulsion (MPS) can improve the foam stability. The silicone resin polyether emulsion is a non-ionic surfactant with a CMC value (critical micelle concentration) of 10 -6 mol / L -1 The magnitude is much lower than that of anionic surfactants. It will combine with the non-polar end of anionic surfactants through van der Waals force to form a longer and more stable chain. On the one hand, it can further reduce the surface tension of the foaming agent and make foaming easier. On the other hand, it can increase the stability of the system, enhance the water retention capacity of the foam, reduce water loss and improve the stability of the foam.

[0028] Moreover, it is more suitable for sodium lauryl sulfate (K) than fatty alcohol polyoxyethylene ether 9 (AEO-9) and coconut oil fatty acid diethanolamide (6501). 12) is a commonly used foam stabilizer for system compounding. The silicone resin polyether emulsion selected in this application and the preferred anionic surfactant foaming combination have a better coordination effect.

[0029] Furthermore, the solubilizing component is an anti-white water solvent.

[0030] Specifically, the anti-white water solvent is mainly ethylene glycol monobutyl ether, which is used to disperse and dissolve the silicone resin polyether emulsion to increase the overall stability of Agent A.

[0031] Furthermore, the thickening component is hydroxypropyl methylcellulose.

[0032] In the present application, the selected hydroxypropyl methylcellulose can increase the foam stability, optimize the foam size and foam roundness, and stabilize the density of the foam lightweight soil, thereby showing higher slurry stability and better mechanical properties.

[0033] Furthermore, the synergistic component is a combination of lipophilic modified nano-silica and sodium polycarboxylate, the mass proportion of lipophilic modified nano-silica in agent B is 10%-25%, and the mass proportion of sodium polycarboxylate in agent B is 5%-20%.

[0034] In the present application, the lipophilic modified nano-silica used is more compatible with the foaming agent system of the present application, and is also a foam-stabilizing structure, which can refine the foam components and distribute them more evenly after being added. Furthermore, the nano-silica adsorbed on the bubble surface can react with the hydration product calcium hydroxide, thereby making the foam wall denser and obtaining a more stable foam structure.

[0035] In addition, compared with traditional wood calcium and naphthalene water reducers, the sodium polycarboxylate selected in this application is a high-performance water reducer with obvious water reduction effect and good economic benefits. More specifically, the stability of traditional solvent-based foaming agents is uncontrollable after adding sodium polycarboxylate, and flocculation is easy to occur. However, through the setting of this application, the high-purity triethanolamine in the dispersed component can be used to disperse the various powders including sodium polycarboxylate, which will not destroy its physical and chemical properties, while improving the stability of the foaming agent system and ensuring the foaming effect. The sodium polycarboxylate used can improve the dispersibility and fluidity of the slurry during the mixing of the foam and the slurry, avoid using too much water to ensure cast-in-place fluidity and cause the foam to fail, reduce the occurrence of broken bubbles while improving the mixing effect of the foam, improve the integrity of the foam, and distribute the nano-silica in the foam structure with low breakage rate through surface tension after mixing, and fix it through hydration reaction and early strength effect, so as to achieve the formation of a uniform and stable foam structure in a coordinated manner.

[0036] Among them, the amount of foaming agent and the foaming ratio are generally controlled according to the density of the foamed lightweight soil. Within the provided dosage range, it is also suitable for the cement content in the foamed lightweight soil.

[0037] Furthermore, the dispersing component is triethanolamine. In the present application, triethanolamine can improve the dispersibility of each component in agent B, and when foaming, the uniformity of the foam is higher, which is conducive to forming a good foam structure. Moreover, in addition to being a dispersing component, triethanolamine can also participate in the hydration process of cement, accelerate the development of hydration products, improve early strength performance, help stabilize the formed foam structure, and improve the overall performance of lightweight soil.

[0038] Specifically, the present application concentrates the components that reduce surface activity to produce high-quality foam in agent A, and concentrates the raw materials that are not easily dispersed in water in agent B, so that they can be dissolved in a concentrated manner and quickly dissolved and dispersed during foaming. The dispersing is assisted by the solubilizing component, which reduces the difficulty of configuration, improves the foaming efficiency while ensuring the foam performance, and reduces the labor and time required.

[0039] Among them, the component raw materials of Agent B are stable in nature and easy to package. The Agent B package can be configured in advance according to the preset foam liquid dosage, and the dilution ratio can be marked. When used, the foam can be quickly prepared in conjunction with the foaming process.

[0040] The foaming agent provided in this application can stabilize the foam structure after preparing the foam lightweight soil, obtain a smaller foam size and higher foam stability, thereby increasing the mechanical properties of the foam lightweight soil. Moreover, compared with the traditional composite foaming agent, the foaming agent can make the raw material wet density 400kg / m 3 The 28d compressive strength of the foamed lightweight soil is increased from 0.4-0.6MPa to 0.6-1.0MPa; the wet density of the raw material is 600kg / m 3 The 28d compressive strength of the foam lightweight soil is increased from 1.2-1.5MPa to 2.0-2.5MPa.

[0041] The present application also provides a method for preparing the foaming agent for cast-in-place foam lightweight soil as described above, which comprises the following steps: Prepare agent A and agent B respectively; The preparation method of agent A comprises the following steps: Add water to the container, add the foaming component, stir for 30-90 minutes to dissolve, then add the solubilizing component and the foam stabilizing component, continue stirring for 15-45 minutes to obtain Agent A; The preparation method of agent B comprises the following steps: Add the thickening component and the synergistic component into a container, then add the dispersing component, stir for 5-15 minutes to obtain Agent B.

[0042] Specifically, after the preparation is completed, Agent B can be packaged and marked with the ratio of the mass of Agent B to the dilution water of 1:100-200 (kg / L) as the recommended dilution ratio, and then sealed and stored in a cool place.

[0043] The present application also provides a foamed lightweight soil, wherein the foamed lightweight soil uses the foaming agent for cast-in-place foamed lightweight soil as described above as a foaming agent. By using the foaming agent provided by the present application, the foamed structure formed is good and stable, and the mechanical properties of the foamed lightweight soil can be improved.

[0044] Furthermore, the foamed lightweight soil is prepared by the following preparation method: Prepare gelling slurry; Mixing agent B with dilution water to obtain a foaming agent liquid; After adding agent A to the foaming agent liquid and mixing, the foaming agent liquid is foamed to obtain foam, and the foam is mixed with the gelling slurry to obtain the raw material of foamed lightweight soil; The density of the foam obtained by foaming is 48-52kg / m 3 The amount of foam used corresponds to the density of the foam lightweight soil, with the wet density of the raw material being 400-1000kg / m 3 Take foam light soil as an example, every 1m 3 The foam dosage of foam lightweight soil is 800-400L, and the specific foam dosage can be adjusted according to the required wet density.

[0045] Furthermore, the process of mixing agent B with dilution water to obtain a foaming agent liquid can be specifically performed by adding agent B into a container, adding dilution water and mixing to obtain the foaming agent liquid. Specifically, the process of adding dilution water can automatically disperse and dissolve agent B, so that the foaming agent liquid can be quickly prepared, and agent A is also easy to mix with the foaming agent liquid, eliminating the process of adding a thickener, and achieving rapid foaming. Among them, the container can specifically be a stirring tank.

[0046] Furthermore, the ratio of agent B to dilution water is 1:100-200 (kg / L). Under this dilution amount, while ensuring the basic foam performance, the raw materials of agent B are easily dispersed and dissolved during the dilution process, saving operation.

[0047] Furthermore, the volume ratio of agent A to dilution water is 1:50. Under this dosage, agent B and agent A can perform better performance coordination and stabilize the amount of foam formed.

[0048] Alternatively, the foamed lightweight soil can also be prepared by the following preparation method: Prepare gelling slurry; Mixing Agent A and Agent B, adding dilution water and mixing to obtain a foaming agent liquid; The foaming agent is foamed with liquid to obtain foam, and the foam is mixed with gelling slurry to obtain the raw material of foamed lightweight soil; The ratio of Agent B to dilution water is 1:100-200 (kg / L); The volume ratio of Agent A to dilution water is 1:50.

[0049] Furthermore, the process of mixing agent A and agent B with dilution water to obtain a foaming agent liquid can be specifically carried out by adding agent A and agent B into a container, and automatically dispersing and dissolving agent A and agent B through the process of adding dilution water, so as to quickly prepare the foaming agent liquid. During the dilution process, a large amount of dilution water, when dispersing and dissolving agent B, cooperates with the solubilizing component in agent A to gradually disperse and dissolve the thickening component, thereby greatly improving the foaming efficiency.

[0050] Specifically, the cementitious slurry can be made by adding water to a cementitious material that can bond loose materials into a whole and give them a certain strength through its own physical and chemical effects, and change from a plastic slurry into an object with a certain mechanical strength. The raw material of foamed lightweight soil obtained by mixing the cementitious slurry with foam can be used to cast into a desired shape, and foamed lightweight soil is formed after gelling and solidification. The specific foaming multiple, foam proportion and consolidation strength can be adjusted according to actual application needs.

[0051] Specifically, in the method of use provided above, foaming can be performed by a foaming machine. The foaming agent liquid can be first carried by a container, the foaming agent liquid is extracted by the foaming machine, the mixture is continued to be mixed in the foaming machine and foamed through its foaming chamber, and then the foam is output.

[0052] The invention is further described below by means of specific examples.

[0053] The method for preparing a foaming agent for cast-in-place foam lightweight soil in the embodiment of the present application comprises the following steps: Prepare agent A and agent B respectively; The preparation method of agent A comprises the following steps: Add water to the container, add the foaming component, stir for 60 minutes to dissolve, then add the solubilizing component and the foam stabilizing component, continue stirring for 30 minutes to obtain Agent A; The preparation method of agent B comprises the following steps: Add the thickening component and the synergistic component into a container, then add the dispersing component, stir and mix for 10 minutes to obtain Agent B.

[0054] The method for using the foaming agent for cast-in-place foam lightweight soil in the embodiment of the present application includes method 1: Prepare gelling slurry; Add Agent B into the container, add dilution water in a ratio of 1:200 (kg / L) and mix to obtain a foaming agent liquid; The foaming machine extracts agent A and the foaming agent liquid in the container at the same time according to a volume ratio of 1:50, mixes them in the foaming machine and produces foam through the foaming cavity, and mixes the foam with the gelling slurry to produce the raw material of foamed lightweight soil.

[0055] Method 2: Prepare gelling slurry; Add Agent A and Agent B into a container, add dilution water in a ratio of 1:200 (kg / L) of Agent B to dilution water, and mix to obtain a foaming agent liquid; the volume ratio of Agent A to dilution water is 1:50; The foaming machine extracts the foaming agent liquid in the container, continues to mix it in the foaming machine and makes foam through the foaming chamber, and mixes the foam with the gelling slurry to make the raw material of the foamed lightweight soil.

[0056] Example 1 The foaming agent for cast-in-place foam lightweight soil of Example 1 comprises agent A and agent B; Agent A, calculated by mass percentage, includes the following components: Sodium lauryl polyoxyethylene ether sulfate 11.6%, sodium α-olefin sulfonate 17.4%, silicone polyoxyethylene ether 6%, anti-white water solvent 6%, water 59%; Agent B, calculated by mass percentage, includes the following components: Hydroxypropyl methylcellulose 25%, lipophilic modified nano-silica 20%, sodium polycarboxylate 5%, triethanolamine 50%.

[0057] Comparative Example 1 The foaming agent of Comparative Example 1 comprises the following components calculated by mass percentage: Sodium lauryl polyoxyethylene ether sulfate 10%, sodium α-olefin sulfonate 7.5%, sodium lauryl sulfate 2.5%, triethanolamine 10%, water 70%.

[0058] The preparation method of the foaming agent of Comparative Example 1 comprises the following steps: adding sodium lauryl polyoxyethylene ether sulfate, sodium α-olefin sulfonate, sodium dodecyl sulfate and triethanolamine into water in proportion and mixing them to obtain the foaming agent of Comparative Example 1.

[0059] Comparative Example 2 The foaming agent of Comparative Example 2 comprises the following components calculated by mass percentage: Sodium lauryl polyoxyethylene ether sulfate 5.3%, sodium α-olefin sulfonate 12.4%, silicone resin polyoxyethylene ether 6.4%, copper sulfate 1.8%, anti-white water solvent 6.4%, triethanolamine 7.1%, and water 60.6%.

[0060] The preparation method of the foaming agent of comparative example 2 comprises the following steps: adding sodium lauryl alcohol polyoxyethylene ether sulfate, sodium α-olefin sulfonate, silicone resin polyoxyethylene ether, copper sulfate, anti-white water solvent and triethanolamine into water in proportion and mixing them to obtain the foaming agent of comparative example 2.

[0061] Comparative Example 3 The foaming agent of Comparative Example 3 includes agent A and agent C; Agent A, calculated by mass percentage, includes the following components: Sodium lauryl polyoxyethylene ether sulfate 11.6%, sodium α-olefin sulfonate 17.4%, silicone polyoxyethylene ether 6%, anti-white water solvent 6%, water 59%; Agent C, calculated by mass percentage, includes the following components: Hydroxypropyl methylcellulose 15%, lipophilic modified nano-silica 15%, calcium lignin sulfonate 20%, triethanolamine 50%.

[0062] Comparative Example 4 The foaming agent of Comparative Example 4 includes agent A and agent D; Agent A, calculated by mass percentage, includes the following components: Sodium lauryl polyoxyethylene ether sulfate 11.6%, sodium α-olefin sulfonate 17.4%, silicone polyoxyethylene ether 6%, anti-white water solvent 6%, water 59%; Agent D, calculated by mass percentage, includes the following components: Hydroxypropyl methylcellulose 10%, lipophilic modified nano-silica 10%, naphthalenesulfonate formaldehyde condensate 30%, triethanolamine 50%.

[0063] The cast-in-place foam lightweight soil foaming agent prepared in Example 1 and the foaming agents of Comparative Examples 1-4 were foamed to a density of 50 kg / m 3 The air stability of the foam was tested according to the standard "CJJ / T177-2012 Bubble Mixed Lightweight Soil Filling Engineering Technology". Then, 568L of foam was mixed with 567kg of cementitious slurry (including 248kg of Foshan Yingde water P0425R, 106kg of secondary fly ash, and 213kg of water) to form a wet density of 600kg / m 3 The mixed slurry was then tested for solidification settlement rate. The test results are shown in Table 1: Table 1

[0064] By comparison, it can be found that the foam of the foaming agent for cast-in-place foam lightweight soil prepared in the embodiment of the present application is stable, not easy to bleed and settle, and can continue to maintain a low settlement rate even after curing with the slurry, and has good foam performance.

[0065] Foshan Yingde cement P0425R and secondary fly ash are prepared into a cementitious slurry according to a certain water-cement ratio, and the cast-in-place foamed lightweight soil of Example 1 and the foaming agents of Comparative Examples 1-4 are foamed to obtain their own foams, which are then mixed with the cementitious slurry to prepare the raw materials of the foamed lightweight soil. 3The raw material ratio of foamed lightweight soil is shown in Table 2: Table 2 <![CDATA[Wet density kg / m 3 > Foshan Yingde water P0425R / kg Secondary fly ash / kg Water / kg Foam / L 400 174 75 112 797 600 248 106 213 568 1000 442 189 347 442 The foamed lightweight soil prepared by the foaming agent of the cast-in-place foamed lightweight soil of Example 1 and the foaming agent of Comparative Examples 1-4 was tested for 28d strength, and the test results are shown in Table 3: Table 3

[0066] By comparison, it can be found that the cast-in-place foam lightweight soil prepared by the foaming agent in the embodiment of the present application has a higher 28d strength of the foam lightweight soil, which means that the prepared foam has good slurry stability after mixing and high foam stability, and the formed foam structure can increase the compressive strength of the foam lightweight soil.

[0067] The foaming agent for cast-in-place foam lightweight soil provided in the embodiment of the present application has good comprehensive performance. After the foam lightweight soil is configured, the foam structure can be stabilized to obtain a smaller foam size and higher foam stability, thereby increasing the mechanical properties of the foam lightweight soil.

[0068] It should be understood that the application of the present application is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made according to the above description, and all these improvements and changes should fall within the scope of protection of the present application.

Claims

1. A foaming agent for cast-in-place foam lightweight soil, characterized in that: Includes dose A and dose B; The agent A comprises the following components calculated by mass percentage: The foaming component is 20%-40%, the foam stabilizing component is 4%-8%, the solubilizing component is 6%-12%, and the balance is water; The agent B comprises the following components calculated by mass percentage: Thickening component 10%-30%, synergistic component 15%-45%, dispersing component 30%-60%.

2. The foaming agent for cast-in-place foam lightweight soil according to claim 1, characterized in that: The foaming component is a combination of sodium lauryl polyoxyethylene ether sulfate and sodium α-olefin sulfonate, and the mass proportion of sodium lauryl polyoxyethylene ether sulfate in the A agent is 8%-16%; The mass proportion of the sodium α-olefin sulfonate in the agent A is 12%-24%.

3. The foaming agent for cast-in-place foam lightweight soil according to claim 2, characterized in that: The mass ratio of the sodium lauryl polyoxyethylene ether sulfate to the sodium α-olefin sulfonate is 2:

3.

4. The foaming agent for cast-in-place foam lightweight soil according to claim 1, characterized in that: The foam stabilizing component is silicone polyether emulsion; The solubilizing component is an anti-white water solvent.

5. The foaming agent for cast-in-place foam lightweight soil according to claim 1, characterized in that: The thickening component is hydroxypropyl methylcellulose.

6. The foaming agent for cast-in-place foam lightweight soil according to claim 1, characterized in that: The synergistic component is a combination of lipophilic modified nano-silica and sodium polycarboxylate, wherein the mass proportion of the lipophilic modified nano-silica in the agent B is 10%-25%, and the mass proportion of the sodium polycarboxylate in the agent B is 5%-20%.

7. The foaming agent for cast-in-place foam lightweight soil according to claim 1, characterized in that: The dispersing component is triethanolamine.

8. A method for preparing a foaming agent for cast-in-place foam lightweight soil according to any one of claims 1 to 7, characterized in that: The following steps are involved: Prepare the A agent and the B agent respectively; The preparation method of the agent A comprises the following steps: Add water to the container, add the foaming component, stir for 30-90 minutes to dissolve, then add the solubilizing component and the foam stabilizing component, continue stirring for 15-45 minutes to obtain the A agent; The preparation method of the agent B comprises the following steps: The thickening component and the synergistic component are added into a container, and then the dispersing component is added, and the mixture is stirred for 5-15 minutes to obtain the agent B.

9. A foamed lightweight soil, characterized in that: The foamed lightweight soil adopts the foaming agent for cast-in-place foamed lightweight soil as described in any one of claims 1 to 7 as a foaming agent.

10. The foamed lightweight soil according to claim 9, characterized in that: The foamed lightweight soil is prepared by the following preparation method: Prepare gelling slurry; Mixing the agent B with dilution water to obtain a foaming agent liquid; After adding the agent A to the foaming agent liquid and mixing, the foaming agent liquid is foamed to obtain foam, and the foam is mixed with a gelling slurry to obtain a raw material for foamed lightweight soil; The ratio of agent B to dilution water is 1:100-200 (kg / L); The volume ratio of the A agent to the foaming agent liquid is 1:50; Alternatively, the foamed lightweight soil is prepared by the following preparation method: Prepare gelling slurry; The A agent and the B agent are mixed, and then diluted with water to obtain a foaming agent liquid; The foaming agent is foamed with liquid to obtain foam, and the foam is mixed with gelling slurry to obtain the raw material of foamed lightweight soil; The ratio of agent B to dilution water is 1:100-200 (kg / L); The volume ratio of agent A to dilution water is 1:50.

Images