A method for evaluating the foam stability of light fluidified soil

Abstract

The present application relates to the technical field of civil engineering material performance test, and more particularly to a method for evaluating the stability of foam for light fluidized solidified soil, comprising: adding the foam to be evaluated into a reference slurry of fluidized solidified soil to obtain a slurry-foam mixture; setting the reference slurry of fluidized solidified soil without adding the foam to be evaluated as a blank slurry group; loading them into test containers of the same specification respectively, and recording the initial volume or initial height of both; recording the volume change or height change of both within a preset standing time; calculating the defoaming rate of the slurry-foam mixture, and evaluating the stability of the foam in the light fluidized solidified soil slurry environment; by setting the slurry-foam mixture group and the blank slurry group without adding the foam, recording the volume or height change of both within the same standing time, and adopting the difference correction method to deduct the influence of the settlement, bleeding and volume change of the reference slurry itself, so as to obtain the real defoaming rate of the foam in the slurry environment.

Description

Technical Field

[0001] This invention relates to the field of civil engineering material performance testing technology, and in particular to a method for evaluating the foam stability of lightweight fluidized solidified soil. Background Technology

[0002] Lightweight fluidized solidified soil is a new type of engineering filling material formed by mixing soil, water, solidifying agent, admixtures, and lightweight components such as foam. It combines fluidity, self-compacting properties, pumpability, and lightweight characteristics. This type of material can reduce filling load and improve construction efficiency in engineering backfilling, and can also absorb solid waste such as engineering spoil, silty soil, and tunnel boring machine excavation.

[0003] In foamed lightweight fluidized bed slurry, foam stability directly affects the material's wet density, flowability, pore structure, compressive strength, and volumetric stability. If a large number of foam particles rupture, coalesce, or float to the surface in the slurry, it can lead to increased mixture density, localized segregation, uneven pore structure, strength fluctuations, and unstable construction quality. Therefore, accurately evaluating the stability of foam in the fluidized bed slurry is a crucial aspect of mix design and on-site quality control for lightweight fluidized bed slurry.

[0004] Existing foam stability evaluation methods are mostly aimed at pure foam systems, and often use indicators such as foam settling distance, bleeding volume, and half-life to evaluate the stability of the foam itself. However, lightweight fluidized solidified soil slurry has the characteristics of high solid content, high viscosity, strong alkalinity, particle adsorption, shear defoaming and hydration reaction. After foam is added to the slurry, it is not only affected by foaming agent and foam stabilizer, but also by the combined effects of slurry viscosity, particle size distribution, type of solidifying agent, type of admixture, stirring shear strength and slurry bleeding characteristics.

[0005] Therefore, simple foam stability tests are difficult to accurately reflect the actual defoaming behavior of foam in fluidized solidified soil slurry. At the same time, existing construction sites lack a unified and standardized testing procedure for the defoaming rate after foam is added to the slurry, which is not conducive to objective comparison between different foaming agents, foam stabilizers and mix proportions.

[0006] Therefore, it is necessary to propose a test method that can simulate the slurry environment, eliminate the effects of sedimentation and bleeding of the reference slurry itself, and quantitatively evaluate the true stability of foam.

[0007] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0008] This invention provides a method for evaluating the foam stability of lightweight fluidized solidified soil. By setting up a slurry-foam mixture group and a blank slurry group without foam, the volume or height changes of the two are recorded within the same settling time. The influence of the settling, bleeding, and volume change of the reference slurry is deducted by a difference correction method, thereby obtaining the true defoaming rate of foam in the slurry environment. This solves the problem that existing test methods such as pure foam settling distance and bleeding volume cannot truly reflect the defoaming behavior after foam is mixed with fluidized solidified soil slurry.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The first aspect of this invention provides a method for evaluating the foam stability of lightweight fluidized solidified soil, the evaluation method comprising: S1. Prepare or obtain a reference slurry of fluidized solidified soil and foam to be evaluated; S2 adds the foam to be evaluated into the reference slurry of the fluidized solidified soil and mixes it according to the preset mixing regime to obtain a slurry-foam mixture. Through this step, the foam is subjected to the actual slurry environment and mixing and shearing action, thereby obtaining a slurry-foam mixture that can reflect the actual state of the foam in the lightweight fluidized solidified soil. S3 Simultaneously set up a reference slurry of fluidized solidified soil without foam to be evaluated as a blank slurry group. The amount of fluidized solidified soil reference slurry used in the blank slurry group is the same as the amount of fluidized solidified soil reference slurry used to prepare the slurry-foam mixture. The slurry-foam mixture and the blank slurry group are respectively put into test containers of the same specifications, and the initial volume or initial height of the slurry-foam mixture and the blank slurry group are recorded. S4 Records the volume or height changes of the slurry-foam mixture and the blank slurry group under the same settling conditions within a preset settling time; This step obtains the time-dependent change data of the test group and the control group under the same conditions, providing basic data for subsequent difference correction and defoaming rate calculation; S5 calculates the defoaming rate of the slurry-foam mixture based on the change in volume difference or height difference between the slurry-foam mixture and the blank slurry group. In this step, the defoaming rate of the slurry-foam mixture is calculated by using the change in volume difference or height difference between the slurry-foam mixture and the blank slurry group to deduct the influence of factors such as the sedimentation, bleeding and volume change of the reference slurry itself, so as to obtain a quantitative index that better reflects the actual defoaming situation of foam in the slurry. S6 evaluates the stability of foam in a lightweight fluidized solidified soil slurry environment based on the defoaming rate of the slurry-foam mixture.

[0010] The evaluation method of this invention involves actually adding the foam to be evaluated into a reference slurry of fluidized solidified soil and mixing it under a preset stirring regime. This allows the foam to experience a slurry environment and shearing action similar to the actual preparation process of lightweight fluidized solidified soil. Compared to testing only the settling distance, bleeding volume, or half-life of pure foam, this method can more realistically reflect the stability of the foam in the fluidized solidified soil slurry. Simultaneously, by setting up a blank slurry group with the same amount of reference slurry used in the slurry-foam mixture, and simultaneously recording the volume or height changes of the two groups under the same test container and static conditions, the influence of the settling, bleeding, and volume changes of the reference slurry itself can be corrected using the volume difference or height difference between the two groups. This reduces the interference of slurry changes on the foam defoaming evaluation results. Furthermore, the stability of the foam in the lightweight fluidized solidified soil slurry environment is quantitatively evaluated using the slurry-foam mixture defoaming rate. This method is beneficial for improving the authenticity and comparability of evaluation results under different foam systems, slurry mix ratios, and test conditions.

[0011] Furthermore, when recording changes in volume difference, the defoaming rate of the slurry-foam mixture is calculated according to the following formula: D m (t)={[(V m0 -V mt )-(V β0 -V βt )] / (V m0 -V β0 )}×100%; Among them, D m (t) represents the volumetric defoaming rate of the slurry-foam mixture at time t, where V is the volumetric value. m0 V is the initial volume of the slurry-foam mixture. mt V is the volume of the slurry-foam mixture at time t. β0 V is the initial volume of the blank slurry group. βt Let be the volume of the blank slurry group at time t.

[0012] More specifically, the defoaming rate of the slurry-foam mixture is quantitatively calculated using the above formula. The volume reduction of the slurry-foam mixture during the settling process is subtracted from the volume reduction of the blank slurry group itself, thereby correcting for the effects of sedimentation, bleeding, and volume changes of the fluidized solidified soil reference slurry. The initial volume difference between the slurry-foam mixture and the blank slurry group is used as the calculation benchmark. This can more effectively reflect the actual volume loss of foam in the fluidized solidified soil slurry environment, improve the authenticity and comparability of the defoaming evaluation results, and provide quantitative indicators for comparing the stability of different foam systems under the same slurry conditions.

[0013] Furthermore, when recording changes in height difference, the slurry-foam mixture and the blank slurry group were respectively placed into test containers with the same internal cross-sectional area and constant height. The defoaming rate of the slurry-foam mixture was calculated according to the following formula: D h (t)={[(H m0 -H mt )-(H β0 -H βt )] / (H m0 -H β0 )}×100%; Among them, D h (t) represents the defoaming rate of the slurry-foam mixture calculated based on height at time t, where H is the defoaming rate. m0 H is the initial height of the slurry-foam mixture. mt H is the height of the slurry-foam mixture at time t. β0 H represents the initial height of the blank slurry group. βt The height of the blank slurry group at time t.

[0014] More specifically, by measuring the height changes of the slurry-foam mixture and the blank slurry group in a test container with the same internal cross-sectional area and constant height direction, the height change is used as an equivalent characterization of the volume change. The height change of the blank slurry itself is corrected by the difference between the two sets of height changes. The defoaming rate of the slurry-foam mixture is then obtained by using the difference between the two initial heights as the calculation benchmark. The above method of calculation based on height maintains the blank correction idea and can complete the test by directly reading the liquid level or material level. The test process is more intuitive and simple, and it is especially suitable for occasions where it is inconvenient to directly read the volume change but the height change can be accurately measured.

[0015] Furthermore, in S1, the fluidized solidified soil reference slurry is prepared by mixing the following raw materials: soil, water, curing agent and additives; The fluidized solidified soil reference slurry is fluid before the foam to be evaluated is added.

[0016] Furthermore, the fluidity of the reference slurry of the solidified soil before the addition of the foam to be evaluated was 160–300 mm, and the wet density was 1.2–1.9 g / cm³. 3 .

[0017] More specifically, the above-mentioned limitations on the flow state and density of the fluidized solidified soil reference slurry help to ensure that the fluidized solidified soil reference slurry used in different tests is within a relatively clear performance range, reduce the impact of the differences in the state of the fluidized solidified soil reference slurry on the foam stability evaluation results, and improve the comparability of test results between different foam systems or different test groups.

[0018] Furthermore, in S1, the foam to be evaluated is a pre-made foam obtained by physical foaming of the following raw materials: foaming agent, water, and foam stabilizer.

[0019] Furthermore, the wet density of the foam to be evaluated is 30–80 kg / m³. 3 The amount of foam to be evaluated is 5 to 60% of the volume of the reference slurry of the fluidized solidified soil.

[0020] Furthermore, in S2, the parameters of the preset stirring regime include: stirring speed of 60 to 200 r / min and stirring time of 30 s to 5 min.

[0021] More specifically, the parameters of the aforementioned preset mixing regime can quantitatively control the mixing shear conditions after foam is added to the fluidized solidified soil reference slurry, so that the foam to be evaluated is fully mixed with the slurry under relatively uniform shear action, and simulates the actual shear action that the foam is subjected to after being added to the fluidized solidified soil slurry. This helps to reduce the differences in the degree of foam rupture caused by different mixing conditions and improve the comparability between different test results.

[0022] Furthermore, the test container is a transparent graduated container, which includes any one of a transparent graduated cylinder, a transparent cylindrical tube, a transparent mold, or a graduated transparent container.

[0023] More specifically, a transparent graduated container is used, specifically limited to any one of a transparent measuring cylinder, a transparent cylindrical cylinder, a transparent mold, or a graduated transparent container. This allows for direct observation of the state changes of the slurry-foam mixture and the blank slurry group during the settling process, and the reading of their volume or height change data. This provides an intuitive and convenient testing method for calculating the defoaming rate of the slurry-foam mixture.

[0024] Furthermore, the preset settling time includes at least one of 5 min, 15 min, 30 min, 60 min, and 120 min.

[0025] More specifically, setting the preset settling time to at least one of 5 min, 15 min, 30 min, 60 min, and 120 min can cover different settling stages after mixing foam and fluidized solidified soil slurry. The shorter 5 min and 15 min are beneficial for reflecting the early stable state after foam mixing, while 30 min and 60 min can be used to evaluate the continuous stability of foam during the conventional settling process. 120 min can further examine the defoaming changes under longer settling conditions. By setting evaluation nodes at different time scales, the test time points can be flexibly selected according to the test objectives or the quality control requirements of the engineering site, thus taking into account both rapid evaluation and long-term stability evaluation, and improving the applicability and operability of the method.

[0026] Furthermore, the foam stability is evaluated by grading based on the defoaming rate of the slurry-foam mixture, with the defoaming rate at 30 min or 60 min being the preferred evaluation index. When the defoaming rate of the slurry-foam mixture is no more than 10%, the foam stability is judged to be excellent. When the defoaming rate of the slurry-foam mixture is greater than 10% but not greater than 20%, the foam stability is judged to be good. When the defoaming rate of the slurry-foam mixture is greater than 20% but not greater than 35%, the foam stability is judged to be average. When the defoaming rate of the slurry-foam mixture is greater than 35%, the foam stability is judged to be poor.

[0027] The technical solution of this invention can achieve the following technical effects: (1) The present invention adds the foam to be evaluated into the reference slurry of fluidized solidified soil and mixes it according to the preset stirring regime, so that the foam can be evaluated under the slurry environment and certain shear conditions. Compared with the method of evaluating the stability of pure foam alone, this method can consider the influence of slurry composition and stirring process on foam state, which helps to make the test conditions closer to the actual preparation and use process of lightweight fluidized solidified soil. (2) In this invention, a blank slurry group without foam is set up, and the volume or height changes of the slurry-foam mixture and the blank slurry group are recorded simultaneously under the same static conditions. By comparing the two sets of data, the influence of the sedimentation, bleeding and volume change of the reference slurry itself can be corrected to a certain extent, thereby reducing the interference of the above factors on the foam stability evaluation results; (3) The present invention uses the defoaming rate of slurry-foam mixture as the evaluation index, and can be calculated by volume method or height method, thereby converting the time change of foam in slurry into a comparable numerical index, which can be used for comparative evaluation under different foam systems, foam dosage or slurry mix ratio conditions. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic flowchart of the foam stability evaluation method for lightweight fluidized solidified soil according to the present invention. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0033] The raw materials used in the examples are as follows: The cement used is PO 42.5 ordinary Portland cement; The slag powder used is S95 grade slag powder; Tap water was used for mixing. The water-reducing agent used is a polycarboxylate-based high-performance water-reducing agent; The foaming agent used is sodium dodecyl sulfate; The foam stabilizer is hydroxypropyl methylcellulose; Example 1:

[0034] This embodiment uses the volumetric method to evaluate foam stability. The specific steps are as follows: A reference slurry for fluidized solidified soil was prepared by mixing silty clay, cement, slag powder, water, and a water-reducing agent. The fluidity of the reference slurry was measured to be 220 mm, and the wet density was 1.65 g / cm³. 3 .

[0035] The foam to be evaluated was prepared using a foaming agent, water, and a foam stabilizer, and the wet density of the foam was measured to be 50 kg / m³. 3 Take 1000 mL of fluidized solidified soil reference slurry, add 300 mL of foam to be evaluated, and stir at 100 rpm for 2 min to obtain a slurry-foam mixture. Pour the slurry-foam mixture into a transparent graduated container and record the initial volume V. m0 It is 1180mL.

[0036] Take another 1000 mL of unfoamed fluidized solidified soil reference slurry, stir it at 100 r / min for 2 min, and then pour it into a transparent graduated container of the same size as the blank slurry group. Record the initial volume V of the blank slurry group.β0 The volume is 1000 mL. After standing for 30 minutes, the volume V of the slurry-foam mixture is... mt The volume of the blank slurry group was 1150 mL. βt It is 995 mL.

[0037] The defoaming rate of the slurry-foam mixture after 30 minutes is: D m (30min)={[(1180-1150)-(1000-995)] / (1180-1000)}×100%=13.9%; Therefore, the foam's 30-minute defoaming rate in the fluidized solidified soil slurry environment was 13.9%, which indicates good stability.

[0038] Example 2:

[0039] Using the same fluidized solidified soil reference slurry as in Example 1, two types of foams, A and B, were prepared. 1000 mL of the fluidized solidified soil reference slurry was taken, and foams A and B, each equivalent to 30% of the reference slurry volume, were added. Both mixtures were stirred at 100 r / min for 2 min to obtain slurry-foam mixtures A and B, respectively.

[0040] Mixture A (slurry-foam) and mixture B (slurry-foam) were respectively placed into transparent cylindrical tubes of the same size and cross-section. 1000 mL of the same fluidized solidified soil reference slurry without foam was taken as the corresponding blank slurry group. After stirring at 100 r / min for 2 min, the blank slurry groups were placed into transparent cylindrical tubes of the same size and cross-section as the slurry-foam mixtures.

[0041] Record the initial height H of the A slurry-foam mixture. m0 The height H after standing for 60 minutes is 120.0 mm. mt It is 115.4 mm; corresponding to the initial height H of the blank slurry group. β0 The height H after standing for 60 minutes is 100.0 mm. βt The thickness is 99.0 mm. Therefore, the defoaming rate of slurry-foam mixture A after 60 minutes is: D h (60min)={[(120.0-115.4)-(100.0-99.0)] / (120.0-100.0)}×100%=18.0%; Record the initial height H of the B slurry-foam mixture. m0 The height H after standing for 60 minutes is 120.0 mm. mt It is 112.6 mm; corresponding to the initial height H of the blank slurry group.β0 The height H after standing for 60 minutes is 100.0 mm. βt The thickness is 99.0 mm. Therefore, the defoaming rate of slurry-foam mixture B after 60 minutes is: D h (60min)={[(120.0-112.6)-(100.0-99.0)] / (120.0-100.0)}×100%=32.0%; The results above show that, under the same conditions of fluidized solidified soil reference slurry, foam addition amount, mixing regime, and settling time, the 60-minute defoaming rate of foam A in slurry-foam mixing is lower than that of foam B, indicating that foam A has relatively better stability in fluidized solidified soil slurry under the test conditions of this embodiment. Therefore, this evaluation method can be used for comparative evaluation of different foam systems under the same slurry conditions.

[0042] Example 3:

[0043] At the construction site of the lightweight fluidized solidified soil, 1000 mL of the fluidized solidified soil reference slurry to be used was taken, and 300 mL of the foam to be evaluated was added according to the on-site foam addition ratio. The mixture was stirred at 100 r / min for 2 min to obtain a slurry-foam mixture. At the same time, another 1000 mL of the same fluidized solidified soil reference slurry was taken without adding foam and stirred at 100 r / min for 2 min to serve as a blank slurry group.

[0044] The slurry-foam mixture and the blank slurry assembly were respectively loaded into identical, uniformly sized, transparent graduated cylinders. The initial height H of the slurry-foam mixture was... m0 The initial height H of the blank slurry group is 120.0 mm. β0 It is 100.0 mm.

[0045] After standing for 15 minutes, the height of the slurry-foam mixture was 117.7 mm, and the height of the blank slurry group was 99.7 mm. Therefore: D h (15min)={[(120.0-117.7)-(100.0-99.7)] / (120.0-100.0)}×100%=10.0%; After standing for 30 minutes, the height of the slurry-foam mixture was 114.5 mm, and the height of the blank slurry group was 99.5 mm. Therefore: D h (30min)={[(120.0-114.5)-(100.0-99.5)] / (120.0-100.0)}×100%=25.0%; After standing for 60 minutes, the height of the slurry-foam mixture was 112.0 mm, and the height of the blank slurry group was 99.0 mm. Therefore: D h (60min)={[(120.0-112.0)-(100.0-99.0)] / (120.0-100.0)}×100%=35.0%; The above results allow us to obtain the defoaming rate of the slurry-foam mixture under 15, 30, and 60 min conditions, thus observing the time-dependent changes of the foam in the fluidized solidified soil slurry. At the construction site, the defoaming rate of the slurry-foam mixture at the corresponding time points can be used as a reference for evaluating foam stability according to pre-determined control requirements. When the test results do not meet the pre-determined control requirements, the foam system, foam dosage, mixing conditions, or slurry state can be checked and adjusted based on actual construction conditions.

[0046] Performance verification: To further verify the effectiveness of the evaluation method of this invention in distinguishing the stability of different foam systems, foam systems with different defoaming rates of slurry-foam mixtures were selected, and lightweight fluidized solidified soil was prepared according to the same fluidized solidified soil mix ratio. The wet density, compressive strength and pore structure characteristics of each were then tested.

[0047] The comparative results show that as the defoaming rate of the slurry-foam mixture increases, the foam stability decreases, leading to an increase in the wet density, deterioration of the pore structure, and a reduction in the mechanical properties of the resulting lightweight fluidized solidified soil. Therefore, the evaluation method of this invention can effectively reflect the stability of foam in the fluidized solidified soil slurry environment and can be used for screening different foam systems and optimizing mix proportions.

[0048] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A method for evaluating the foam stability of lightweight fluidized solidified soil, characterized in that, The evaluation methods include: S1. Prepare or obtain a reference slurry of fluidized solidified soil and foam to be evaluated; S2. The foam to be evaluated is added to the fluidized solidified soil reference slurry and mixed according to a preset stirring regime to obtain a slurry-foam mixture; S3 Simultaneously sets up a reference slurry of fluidized solidified soil without the foam to be evaluated as a blank slurry group. The amount of fluidized solidified soil reference slurry in the blank slurry group is the same as the amount of fluidized solidified soil reference slurry used to prepare the slurry-foam mixture. The slurry-foam mixture and the blank slurry group are respectively loaded into test containers of the same specifications, and the initial volume or initial height of the slurry-foam mixture and the blank slurry group are recorded. S4 Records the volume or height changes of the slurry-foam mixture and the blank slurry group under the same settling conditions within a preset settling time. S5 calculates the defoaming rate of the slurry-foam mixture based on the change in volume difference or height difference between the slurry-foam mixture and the blank slurry group; S6 evaluates the stability of foam in a lightweight fluidized solidified soil slurry environment based on the defoaming rate of the slurry-foam mixture.

2. The evaluation method according to claim 1, characterized in that, When recording changes in volume difference, the defoaming rate of the slurry-foam mixture is calculated according to the following formula: D m (t)={[(V m0 -V mt )-(V β0 -V βt )] / (V m0 -V β0 )}×100%; Among them, D m (t) represents the volumetric defoaming rate of the slurry-foam mixture at time t, where V is the volumetric value. m0 V is the initial volume of the slurry-foam mixture. mt V is the volume of the slurry-foam mixture at time t. β0 V is the initial volume of the blank slurry group. βt Let be the volume of the blank slurry group at time t.

3. The evaluation method according to claim 1, characterized in that, When recording changes in height difference, the slurry-foam mixture and the blank slurry group are respectively placed into test containers with the same internal cross-sectional area and constant height direction. The defoaming rate of the slurry-foam mixture is calculated according to the following formula: D h (t)={[(H m0 -H mt )-(H β0 -H βt )] / (H m0 -H β0 )}×100%; Among them, D h (t) represents the defoaming rate of the slurry-foam mixture calculated based on height at time t, where H is the defoaming rate. m0 H is the initial height of the slurry-foam mixture. mt H is the height of the slurry-foam mixture at time t. β0 H represents the initial height of the blank slurry group. βt The height of the blank slurry group at time t.

4. The evaluation method according to any one of claims 1 to 3, characterized in that, In S1, the fluidized solidified soil reference slurry is prepared by stirring the following raw materials: soil, water, solidifying agent and additives; The fluidized solidified soil reference slurry is fluid before the foam to be evaluated is added.

5. The evaluation method according to claim 4, characterized in that, The fluidity of the solidified soil reference slurry before the addition of the foam to be evaluated was 160–300 mm, and the wet density was 1.2–1.9 g / cm³. 3 .

6. The evaluation method according to any one of claims 1 to 3, characterized in that, In S1, the foam to be evaluated is a pre-made foam obtained by physical foaming of the following raw materials: foaming agent, water and foam stabilizer.

7. The evaluation method according to claim 6, characterized in that, The wet density of the foam to be evaluated is 30–80 kg / m³. 3 The amount of foam to be evaluated added is 5 to 60% of the volume of the fluidized solidified soil reference slurry.

8. The evaluation method according to any one of claims 1 to 3, characterized in that, In S2, the parameters of the preset stirring regime include: stirring speed of 60-200 r / min and stirring time of 30 s-5 min.

9. The evaluation method according to any one of claims 1 to 3, characterized in that, The test container is a transparent graduated container, which includes any one of a transparent graduated cylinder, a transparent cylindrical cylinder, a transparent mold, or a graduated transparent container.

10. The evaluation method according to any one of claims 1 to 3, characterized in that, The preset settling time includes at least one of 5 min, 15 min, 30 min, 60 min, and 120 min.

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