CN112390661A - Lightweight curing method for lightweight cured waste soil and waste soil backfill - Google Patents
Lightweight curing method for lightweight cured waste soil and waste soil backfill Download PDFInfo
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- CN112390661A CN112390661A CN202011329189.0A CN202011329189A CN112390661A CN 112390661 A CN112390661 A CN 112390661A CN 202011329189 A CN202011329189 A CN 202011329189A CN 112390661 A CN112390661 A CN 112390661A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a lightweight treatment and solidification method for lightweight solidified waste soil and waste soil backfill, which comprises the following steps: carrying out desertification treatment on the waste soil; preparing a cement soil slurry; preparing a foaming agent; and adjusting the discharging speed of the cement-soil slurry and the foaming speed of the foaming agent to mix the cement-soil slurry and the foaming agent to form the flowable light solidified waste soil. The method for treating and curing the waste soil backfill in a lightweight manner can effectively increase the resource utilization efficiency of the waste soil, and has the characteristics of light weight, high strength, economy, environmental friendliness and the like. Compared with the traditional soft soil foundation replacement and filling construction method, the method has the characteristics of good mechanical property, low construction noise, convenient and quick construction, short construction period and the like, can effectively reduce the weight of the roadbed, achieves the purpose of controlling settlement, and has wide application prospect.
Description
Technical Field
The invention relates to the technical field of waste soil recycling, in particular to a lightweight treatment and solidification method for waste soil backfill.
Background
A large amount of waste soil is continuously generated in the process of constructing highways and urban roads, and the accumulation of the large amount of waste soil can cause the occupation of a large amount of land resources and environmental pollution.
In the prior art, the waste building concrete is prepared into regenerated micro-powder, the regenerated micro-powder is mixed into the foam concrete for recycling, the flowability of the foam concrete is poor due to the gelation of the regenerated micro-powder, and the compressive strength of the prepared foam concrete is obviously reduced along with the increase of the mixing amount of the regenerated micro-powder.
In the prior art, an application method exists for doping waste foamed cement lightweight aggregate into foam concrete for recycling. However, the specific strength of the waste foamed cement lightweight aggregate is far lower than that of pure foamed cement slurry, so that the specific strength of the prepared lightweight aggregate foamed concrete is in a descending trend along with the doping of the waste foamed cement lightweight aggregate.
In the prior art, an application method for reusing waste soil and applying the waste soil to embankment filling does not exist.
Disclosure of Invention
The invention aims to provide a green waste soil resource utilization method, which is characterized in that waste soil is processed to form light solidified waste soil, the light solidified waste soil can be directly poured and filled, the light property of the light solidified waste soil is utilized to reduce the self weight of a roadbed and reduce the stress of the foundation, so that the post-construction settlement and uneven settlement of a soft soil section are reduced, and the problem of the current deep and soft foundation settlement can be solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a light solidified waste soil comprises the following components in parts by weight: 20-100 parts of waste soil, 100-170 parts of cement, 20-30 parts of fly ash, 4-10 parts of foaming agent, 1-3 parts of air entraining agent, 6-10 parts of water reducing agent and 80-130 parts of water.
Further, the foaming agent comprises the following components in parts by weight: 2-5 parts of polyvinyl alcohol, 5-10 parts of sodium dodecyl benzene sulfonate, 0.5-0.8 part of triethanolamine and 70-200 parts of water.
The sodium dodecyl benzene sulfonate belongs to a straight-chain alkane anionic surfactant, can be dissociated to form an anionic group after being dissolved in water, has the structures of a hydrophilic group and a hydrophobic group, can effectively reduce the surface tension of liquid, and has efficient and stable foaming and foaming performances; the polyvinyl alcohol is an emulsifier with high water solubility and has the functions of emulsifying, foaming and stabilizing foam; the triethanolamine has good emulsibility and thickening property, and can play a role in increasing the strength and stability of foam.
Preferably, the lightweight solidified waste soil further comprises 10 to 85 parts of lightweight aggregate.
Preferably, the lightweight aggregate is one or a combination of ceramsite, particle gel, foam particles and EPS particles.
Further preferably, the particle size range of the ceramsite is 20-25mm, and the density is 300-450kg/m3。
The light ceramsite is light aggregate, has small density, porous inside and higher strength; the cement soil slurry formed by stirring and mixing the waste soil, the cement, the fly ash and the like with water is used for bonding and fixing the lightweight aggregate, so that the functions of bonding and forming and improving the basic strength are achieved; in the process of stirring and mixing the air entraining agent and the cement soil slurry together, a plurality of uniform and stable small bubbles are generated in the cement soil slurry, so that the fluidity and uniformity of the cement soil slurry are improved; the water reducing agent is matched with the air entraining agent, so that the dispersion uniformity among particles in the cement soil slurry is further improved; the foaming agent generates uniform and fine foam under the mechanical action of a foaming machine, and the foam and the cement soil slurry are uniformly mixed to prepare the solidified waste soil.
A lightweight treatment and solidification method for waste soil backfill comprises the following steps:
(1) and (3) desertification treatment of waste soil: adding cement into the waste soil, fully and uniformly mixing, then putting into an open plastic bag, standing for three days, turning and stirring once a day, and manually crushing; after three days of material sealing, stirring and crushing are carried out to obtain desertified waste soil;
(2) preparing a cement soil slurry; adding the fly ash and water into the desertified waste soil obtained in the step (1) into a stirrer at normal temperature, and continuously stirring and mixing the mixture in the adding process until slurry with uniform color is formed; then adding water, air entraining agent and water reducing agent, continuing stirring, and uniformly mixing until stable discharging can be realized;
(3) preparing a foaming agent; adding polyvinyl alcohol, sodium dodecyl benzene sulfonate, triethanolamine and water into a pressure foaming machine, starting the pressure foaming machine to foam, and preparing foaming agent foam when the foam discharging speed is uniform and the shape and the volume of the foam are uniform and stable;
(4) and adjusting the discharging speed of the cement-soil slurry and the foaming speed of the foaming agent to mix the cement-soil slurry and the foaming agent to form the flowable light solidified waste soil.
When the cast-in-place construction is carried out, a vertical template is erected in a space needing casting, and solidified waste soil is filled into a specified area.
Preferably, the ratio of the pumping speed of the cement-soil slurry to the pumping speed of the foaming machine in the step (4) is (0.43-1.5): 1.
the specific discharging speed ratio can be adjusted according to the porosity of the cement soil slurry and the actual weight and strength requirements of the solidified waste soil, and finally the flowable light solidified waste soil is produced.
The foam pumping speed in the foaming machine is determined according to the conditions of whether bubbles in the light solidified waste soil are uniform, whether the strength of the light solidified waste soil can meet the requirement, the weight of the light solidified waste soil and the like.
Preferably, 10 to 85 parts of lightweight aggregate is added in the preparation of the cement soil slurry in the step (2) to form lightweight solidified waste soil containing the lightweight aggregate. The lightweight aggregate, the fly ash and water are put into a stirrer to be stirred.
Preferably, the lightweight aggregate is one or a combination of ceramsite, particle gel, foam particles and EPS particles.
Preferably, the stirring paddle rotates at a speed of 120-200rpm while stirring and mixing in step (2), and the stirring is continued for 6-10 min.
The invention has the advantages and effects that:
the method for treating and curing the waste soil backfill in a lightweight manner can effectively increase the resource utilization efficiency of the waste soil, and has the characteristics of light weight, high strength, economy, environmental friendliness and the like. Compared with the traditional soft soil foundation replacement and filling construction method, the method has the characteristics of good mechanical property, low construction noise, convenient and quick construction, short construction period and the like, can effectively reduce the weight of the roadbed, achieves the purpose of controlling settlement, and has wide application prospect.
The light solidified waste soil has the characteristics of light weight and high strength, and different waste soil, light aggregate mixing amount and mixing ratios of different strengths can be designed according to construction requirements for construction.
Drawings
FIG. 1 shows the results of quality and strength tests of test blocks prepared from different waste soils in example 4.
FIG. 2 shows the results of the tests on the content of ceramsite and the quality and strength of the light-weight solidified soil in example 5.
Detailed Description
In order to make the purpose and technical solution of the present invention clearer, the following will clearly and completely describe the technical solution of the present invention with reference to the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments.
Example 1
The light solidified waste soil of the embodiment comprises the following components in parts by weight: 20 parts of waste soil, 100 parts of cement, 20 parts of fly ash, 4 parts of foaming agent, 1 part of air entraining agent, 6 parts of water reducing agent and 80 parts of water.
The foaming agent comprises the following components in parts by weight: 2 parts of polyvinyl alcohol, 5 parts of sodium dodecyl benzene sulfonate and 0.5 part of triethanolamine; 70 parts of water is also required to be added when preparing the foaming agent solution.
The mass of each component in the light solidified waste soil of the embodiment is as follows:
5kg of waste soil, 25kg of cement, 5kg of fly ash, 1kg of foaming agent, 0.25kg of air entraining agent, 1.5kg of water reducing agent and 20kg of water.
The mass of each component in 1kg of the foaming agent of the present example is: 0.2kg of polyvinyl alcohol, 0.5kg of sodium dodecyl benzene sulfonate, 0.05kg of triethanolamine and 7kg of water.
A lightweight treatment and solidification method for waste soil backfill comprises the following specific steps:
(1) and (3) desertification treatment of waste soil: adding 25kg of cement into 5kg of waste soil, fully and uniformly mixing, then putting into an open plastic bag, standing for three days, turning and stirring once a day, and manually crushing; after three days of material sealing, stirring and crushing are carried out to obtain desertified waste soil; the water content of the waste soil after the sand treatment is reduced, the viscosity is reduced, and the waste soil is in a granular state.
(2) Preparing a cement soil slurry; adding 5kg of fly ash and 13kg of water into the desertified waste soil obtained in the step (1) into a stirrer at normal temperature, continuously stirring and mixing in the adding process, wherein the rotating speed of a stirring paddle is 120-200rpm, and continuously stirring for 6-10min until slurry with uniform color is formed; then adding 7kg of water, 0.25kg of air entraining agent and 1.5kg of water reducing agent, continuously stirring, and uniformly mixing until stable discharging can be realized;
(3) preparing a foaming agent; adding 0.2kg of polyvinyl alcohol, 0.5kg of sodium dodecyl benzene sulfonate, 0.05kg of triethanolamine and 7kg of water into a pressure foaming machine, starting the pressure foaming machine to foam, and obtaining foaming agent foam when the foam foaming speed is uniform and the shape and the volume of the foam are uniform and stable;
(4) adjusting the discharge speed of the cement-soil slurry and the foaming speed of the foaming agent to ensure that the ratio of the pumping-out speed of the cement-soil slurry to the pumping-out speed of the foaming machine is 1.5: 1, mixing cement soil slurry and a foaming agent to form flowable light solidified waste soil;
(5) pouring the light solidified waste soil obtained in the step (4) into a plurality of test blocks I; placing the prepared test block I in a curing room, curing for 28 days, and then demolding; and (5) observing to find that the appearance of the first test block is good, and performing quality measurement and strength test on the first test block.
Example 2
The light solidified waste soil of the embodiment comprises the following components in parts by weight: 100 parts of waste soil, 170 parts of cement, 30 parts of fly ash, 10 parts of foaming agent, 3 parts of air entraining agent, 10 parts of water reducing agent and 130 parts of water;
the blowing agent of this example comprises the following components in parts by weight: 5 parts of polyvinyl alcohol, 10 parts of sodium dodecyl benzene sulfonate and 0.8 part of triethanolamine; 200 parts of water is also needed to be added when preparing the foaming agent solution.
The mass of each component in the light solidified waste soil of the embodiment is as follows:
5kg of waste soil, 8.5kg of cement, 1.5kg of fly ash, 0.5kg of foaming agent, 0.15kg of air entraining agent, 0.5kg of water reducing agent and 6.5kg of water.
In the present example, the mass of each component in 0.5kg of the foaming agent is: 0.25kg of polyvinyl alcohol, 0.5kg of sodium dodecyl benzene sulfonate, 0.04kg of triethanolamine and 10kg of water.
A lightweight treatment and solidification method for waste soil backfill comprises the following specific steps:
(1) and (3) desertification treatment of waste soil: adding 8.5kg of cement into 5kg of waste soil, fully and uniformly mixing, then putting into an open plastic bag, standing for three days, turning and stirring once every day, and manually crushing; after three days of material sealing, stirring and crushing are carried out to obtain desertified waste soil; the water content of the waste soil after the sand treatment is reduced, the viscosity is reduced, and the waste soil is in a granular state.
(2) Preparing a cement soil slurry; adding 1.5kg of fly ash and 4kg of water into the desertified waste soil obtained in the step (1) at normal temperature, continuously stirring and mixing in the adding process, wherein the rotating speed of a stirring paddle is 120-200rpm, and continuously stirring for 6-10 min; then adding 2.5kg of water, 0.15kg of air entraining agent and 0.5kg of water reducing agent, continuously stirring, and uniformly mixing until stable discharging can be realized;
(3) preparing a foaming agent; adding 0.25kg of polyvinyl alcohol, 0.5kg of sodium dodecyl benzene sulfonate, 0.04kg of triethanolamine and 10kg of water into a pressure foaming machine, starting the pressure foaming machine to foam, and obtaining foaming agent foam when the foam foaming speed is uniform and the shape and the volume of the foam are uniform and stable;
(4) adjusting the discharge speed of the cement-soil slurry and the foaming speed of the foaming agent to ensure that the ratio of the pumping-out speed of the cement-soil slurry to the pumping-out speed of the foaming machine is 0.43: 1, mixing cement soil slurry and a foaming agent to form flowable light solidified waste soil;
(5) pouring the light solidified waste soil obtained in the step (4) into a plurality of second test blocks; placing the prepared test block II in a curing room for curing for 28 days, and then demolding; and observing to find that the appearance of the test block II is good, and performing quality measurement and strength test on the test block II.
Example 3
The light solidified waste soil of the embodiment comprises the following components in parts by weight: 50 parts of waste soil, 120 parts of cement, 25 parts of fly ash, 7.5 parts of foaming agent, 2 parts of air entraining agent, 8 parts of water reducing agent and 100 parts of water.
The blowing agent of this example comprises the following components in parts by weight: 3 parts of polyvinyl alcohol, 7 parts of sodium dodecyl benzene sulfonate and 0.6 part of triethanolamine; 120 parts of water is also required to be added when preparing the foaming agent solution.
The mass of each component in the light solidified waste soil of the embodiment is as follows: 5kg of waste soil, 12kg of cement, 2.5kg of fly ash, 0.75kg of foaming agent, 0.2kg of air entraining agent, 0.8kg of water reducing agent and 10kg of water.
In the present example, the mass of each component in 0.75kg of the foaming agent is: 0.3kg of polyvinyl alcohol, 0.7kg of sodium dodecyl benzene sulfonate, 0.06kg of triethanolamine and 12kg of water.
A lightweight treatment and solidification method for waste soil backfill comprises the following specific steps:
(1) and (3) desertification treatment of waste soil: adding 12kg of cement into 5kg of waste soil, fully and uniformly mixing, then putting into an open plastic bag, standing for three days, turning and stirring once a day, and manually crushing; after three days of material sealing, stirring and crushing are carried out to obtain desertified waste soil; the water content of the waste soil after the sand treatment is reduced, the viscosity is reduced, and the waste soil is in a granular state.
(2) Preparing a cement soil slurry; adding 2.5kg of fly ash and 7kg of water into the desertified waste soil obtained in the step (1) at normal temperature, continuously stirring and mixing in the adding process, wherein the rotating speed of a stirring paddle is 120-200rpm, and continuously stirring for 6-10 min; then adding 3kg of water, 0.2kg of air entraining agent and 0.8kg of water reducing agent, continuously stirring, and uniformly mixing until stable discharging can be realized;
(3) preparing a foaming agent; adding 0.3kg of polyvinyl alcohol, 0.7kg of sodium dodecyl benzene sulfonate, 0.06kg of triethanolamine and 12kg of water into a pressure foaming machine, starting the pressure foaming machine to foam, and obtaining foaming agent foam when the foam foaming speed is uniform and the shape and the volume of the foam are uniform and stable;
(4) adjusting the discharging speed of the cement-soil slurry and the foaming speed of the foaming agent to ensure that the ratio of the pumping-out speed of the cement-soil slurry to the pumping-out speed of the foaming machine is 1: 1, mixing cement soil slurry and a foaming agent to form flowable light solidified waste soil;
(5) pouring the light solidified waste soil obtained in the step (4) into a plurality of test blocks III; placing the prepared test block III in a curing room, curing for 28 days, and then demolding; the test block III is found to have good appearance through observation, and the quality measurement and the strength test are carried out on the test block III.
The results of the mass measurement and strength test of the test pieces obtained in the above examples are shown in Table 1.
TABLE 1 average mass and Strength results for test plaques obtained in each example
In the examples, it can be seen that for test blocks obtained by different blending amounts, the lighter the mass and the lower the strength of the test block, and the higher the mass and the higher the strength, which indicates that the ratio of cement to air bubbles affects the mass and the strength of the light solidified waste soil. If the mass of the light solidified waste soil needs to be further reduced, the content of air bubbles in the light solidified waste soil per unit volume needs to be correspondingly increased. When the waste soil is recycled and used as a light material, the proper proportion of the foaming agent needs to be determined according to different cement doping amounts so as to meet the requirement of sample forming.
Example 4
In this example, on the basis of example 1, waste soils in the xiaoshan area and the shaoxing area were respectively selected and mixed with different types of waste soils to prepare two lightweight solidified waste soil test blocks, except for different waste soils, the mixture ratio and method were the same, the method and mixture ratio in example 1 were all adopted, and 9 test blocks were prepared from the waste soils in the xiaoshan area and the shaoxing area respectively. The obtained test piece was subjected to mass measurement and strength test, and the test results are shown in FIG. 1.
Tests show that the test block formed by the waste soil in the Mount Xiao mountain area with larger silty has smaller cracks and larger compressive strength. Therefore, when the solidified waste soil is improved by mixing soil, the waste soil with larger silt property is used as much as possible under the condition of ensuring that the waste soil, cement and fly ash can be fully mixed, so that the solidified waste soil has better effect.
Example 5
In this example, in order to prove that the addition of the kaolin particles can further reduce the quality of the solidified waste soil, on the basis of example 1, 10 parts, 40 parts, 75 parts and 85 parts of ceramsite are respectively added in parts by weight to form 4 groups of lightweight solidified waste soil test blocks containing different ceramsite doping amounts, and the ceramsite adding amounts of the 4 groups of test blocks are respectively 25g, 50g, 100g and 150g, namely, the first group of test blocks isThe addition amount of the ceramsite in the test block set is 25g, and the addition amount of the ceramsite in the second test block set is 50 g. The added ceramsite is light ceramsite with the particle size range of 20-25mm and the density of 300-450kg/m3Pouring the lightweight solidified waste soil containing the ceramsite into test blocks by the same method as the embodiment 1, and preparing 6 test blocks in each group according to the mixing amount, wherein the total number of the test blocks is 24.
The mass measurement and strength test were performed on all test pieces, and the average mass and strength test results of the test pieces obtained in this example are shown in fig. 2.
As can be seen from FIG. 2, the ceramsite can bear pressure relative to the air bubbles, so that the strength of the sample is improved to a certain extent. However, the more the ceramsite is added, the higher the ceramsite is, the proper amount of the ceramsite needs to be determined according to corresponding tests. Or directly adding the ceramsite into the cement slurry to replace bubbles.
In conclusion, the waste soil dug out by the roadbed construction is used as a raw material for solidifying the waste soil, so that the waste soil can be effectively recycled, and the pollution to the environment is reduced. In addition, foam is added into the cement soil slurry added with the waste soil, so that a large number of closed fine pores are contained, and the cement soil slurry has the characteristics of light weight, good heat insulation performance, high fluidity and the like.
The light solidified waste soil has the characteristics of light weight and high strength, and different waste soil, light aggregate mixing amount and mixing ratios of different strengths can be designed according to construction requirements for construction.
Claims (10)
1. The light solidified waste soil is characterized by comprising the following components in parts by weight: 20-100 parts of waste soil, 100-170 parts of cement, 20-30 parts of fly ash, 4-10 parts of foaming agent, 1-3 parts of air entraining agent, 6-10 parts of water reducing agent and 80-130 parts of water.
2. The lightweight cured waste soil according to claim 1, wherein the foaming agent comprises the following components in parts by weight: 2-5 parts of polyvinyl alcohol, 5-10 parts of sodium dodecyl benzene sulfonate, 0.5-0.8 part of triethanolamine and 70-200 parts of water.
3. The lightweight solidified waste soil as claimed in claim 2, further comprising 10 to 85 parts of lightweight aggregate.
4. The lightweight cured waste soil according to claim 3, wherein the lightweight aggregate is one or a combination of ceramsite, granular gel, foam granules and EPS granules.
5. The light solidified waste soil as claimed in claim 4, wherein the ceramsite has a particle size range of 20-25mm and a density of 300-450kg/m3。
6. A lightweight treatment and solidification method for waste soil backfill is characterized by comprising the following steps:
(1) and (3) desertification treatment of waste soil: adding cement into the waste soil, fully and uniformly mixing, then putting into an open plastic bag, standing for three days, turning and stirring once a day, and manually crushing; after three days of material sealing, stirring and crushing are carried out to obtain desertified waste soil;
(2) preparing a cement soil slurry; adding the fly ash and water into the desertified waste soil obtained in the step (1) into a stirrer at normal temperature, and continuously stirring and mixing the mixture in the adding process until slurry with uniform color is formed; then adding water, air entraining agent and water reducing agent, continuing stirring, and uniformly mixing until stable discharging can be realized;
(3) preparing a foaming agent; adding polyvinyl alcohol, sodium dodecyl benzene sulfonate, triethanolamine and water into a pressure foaming machine, starting the pressure foaming machine to foam, and preparing foaming agent foam when the foam discharging speed is uniform and the shape and the volume of the foam are uniform and stable;
(4) and adjusting the discharging speed of the cement-soil slurry and the foaming speed of the foaming agent to mix the cement-soil slurry and the foaming agent to form the flowable light solidified waste soil.
7. The method for lightweight treatment and solidification of the waste soil backfill according to claim 6, wherein the ratio of the pumping speed of the cement-soil slurry to the pumping speed of the foaming machine in the step (4) is (0.43-1.5): 1.
8. the method for weight-reducing treatment and solidification of the waste soil backfill according to claim 6, characterized in that 10-85 parts of lightweight aggregate is added when the cement soil slurry is prepared in the step (2) to form lightweight solidified waste soil containing the lightweight aggregate.
9. The method for lightweight treatment and solidification of the waste soil backfill according to the claim 8, characterized in that the lightweight aggregate is one or a combination of ceramsite, granular gel, foam granules and EPS granules.
10. The method as claimed in claim 6, wherein the stirring is continued for 6-10min at a paddle speed of 120-200rpm during the stirring and mixing in step (2).
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| CN114262188A (en) * | 2021-12-28 | 2022-04-01 | 宁夏青龙管业集团股份有限公司 | Flowing backfill material for buried pipeline and preparation method and backfill method thereof |
| CN115073087A (en) * | 2022-06-13 | 2022-09-20 | 中建三局四川建筑装备有限公司 | Renewable light aggregate solidified soil |
| CN117299742A (en) * | 2023-11-28 | 2023-12-29 | 中国科学院地质与地球物理研究所 | Method for solidifying microplastic based on geopolymer |
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