CN118026634A - Low-carbon composite gelling curing agent for curing sludge soft soil and curing method thereof - Google Patents
Low-carbon composite gelling curing agent for curing sludge soft soil and curing method thereof Download PDFInfo
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- CN118026634A CN118026634A CN202410168216.2A CN202410168216A CN118026634A CN 118026634 A CN118026634 A CN 118026634A CN 202410168216 A CN202410168216 A CN 202410168216A CN 118026634 A CN118026634 A CN 118026634A
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- 239000002689 soil Substances 0.000 title claims abstract description 118
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 116
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 55
- 239000002131 composite material Substances 0.000 title claims abstract description 50
- 239000010802 sludge Substances 0.000 title claims description 30
- 238000001723 curing Methods 0.000 title abstract description 118
- 239000000843 powder Substances 0.000 claims abstract description 85
- 239000002893 slag Substances 0.000 claims abstract description 68
- 239000010881 fly ash Substances 0.000 claims abstract description 45
- 238000002156 mixing Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 34
- 239000004568 cement Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000002002 slurry Substances 0.000 claims abstract description 23
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 20
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 20
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 20
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 20
- 239000002956 ash Substances 0.000 claims abstract description 15
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 6
- 230000023556 desulfurization Effects 0.000 claims abstract description 6
- 239000000314 lubricant Substances 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 45
- 239000010959 steel Substances 0.000 claims description 45
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 239000010440 gypsum Substances 0.000 claims description 23
- 229910052602 gypsum Inorganic materials 0.000 claims description 23
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 21
- 239000004115 Sodium Silicate Substances 0.000 claims description 20
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 18
- 239000005416 organic matter Substances 0.000 claims description 17
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 14
- 239000002910 solid waste Substances 0.000 claims description 14
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 12
- 239000000292 calcium oxide Substances 0.000 claims description 11
- 150000004683 dihydrates Chemical class 0.000 claims description 11
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 230000008961 swelling Effects 0.000 claims description 2
- 238000006703 hydration reaction Methods 0.000 abstract description 17
- 230000036571 hydration Effects 0.000 abstract description 11
- 238000006068 polycondensation reaction Methods 0.000 abstract description 9
- 238000001879 gelation Methods 0.000 abstract description 6
- 230000002195 synergetic effect Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 22
- 239000000463 material Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 235000012255 calcium oxide Nutrition 0.000 description 9
- 239000012190 activator Substances 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 229910002800 Si–O–Al Inorganic materials 0.000 description 6
- 239000013505 freshwater Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 239000012634 fragment Substances 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 235000010755 mineral Nutrition 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000000498 ball milling Methods 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- 235000012241 calcium silicate Nutrition 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000001627 detrimental effect Effects 0.000 description 3
- 229910001653 ettringite Inorganic materials 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229920000876 geopolymer Polymers 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000002920 hazardous waste Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 235000019976 tricalcium silicate Nutrition 0.000 description 2
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
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- 230000005484 gravity Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011146 organic particle Substances 0.000 description 1
- 229910052592 oxide mineral Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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- 239000011148 porous material Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Landscapes
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a low-carbon composite gelling curing agent for curing silt soft soil and a curing method thereof, wherein the low-carbon composite gelling curing agent comprises the following components in parts by mass: slag powder: 30-60 parts; slag powder: 10-25 parts of a lubricant; fly ash: 5-20 parts; desulfurization ash: 2-10 parts; slaked lime: 5-15 parts; retarder: 2-10 parts; exciting agent: 5-20 parts. The method for curing the silt soft soil by the low-carbon composite gel curing agent comprises the following steps: 1) Mixing the low-carbon composite gelling curing agent with water to obtain a pre-slurry; 2) And mixing the prefabricated slurry with the silt soft soil by a deep mixing pile method. The invention can solve the problem that the existing silt soft soil is difficult to solidify under the condition of not using cement. Hydration and inorganic polycondensation are carried out simultaneously through synergistic gelation, so that the high-strength solidified soil is prepared.
Description
Technical Field
The invention belongs to the field of road engineering materials, and particularly relates to a low-carbon composite gelling curing agent for curing silt soft soil and a curing method thereof.
Background
In coastal, middle-downstream of river or lake nearby areas of our country, a great deal of silt soft soil exists under the surface of the water bottom. Because silt weak soil intensity is extremely low, compressibility is big, the water permeability is poor for foundation bearing capacity is low in this region, intensity increase is slow, and the volatility just inhomogeneous after the loading exists the risk that the road bed subsides, adds the hidden danger for the road construction in this region. On the other hand, along with the industrialized construction of China, the traditional industry faces the problems of large solid waste stock and difficult treatment. Mainly comprises steel slag, fly ash, slag powder, phosphogypsum, desulfurized gypsum and the like. The resource utilization level is low. On the problem of soft soil roadbed, the solidification technology can benefit silt soft soil with high water content. The traditional curing materials mainly comprise cement and quicklime, and the curing agent not only needs to consume a large amount of natural resources. In addition, such a curing agent has a problem of low curing efficiency and low strength after curing even when the organic content is high. Therefore, the current curing agent generally adopts a mode of replacing cement by a large amount of solid waste parts, and the curing efficiency of the curing agent is improved under the action of an exciting agent, so that the purpose of curing sludge soft soil is achieved.
The patent CN113072943A discloses a soft soil hardener based on quartz stone powder and steel slag micropowder, which is prepared by mixing the quartz stone powder, the steel slag micropowder and micropowder prepared from more than one industrial solid waste with an exciting agent, and the purpose of curing foundation soft soil is achieved by the gelation activity of the powder prepared by mixing the materials under the action of the exciting agent. However, for the sludge soft soil with high organic matter content in inland fresh water river, the quartz stone powder, the steel slag micro powder and the industrial solid waste micro powder do not contain components capable of effectively treating the organic matter, so that the scheme can face the problem that the activity of the curing agent is difficult to excite, and the curing effect on the sludge soft soil with high organic matter content is poor.
The patent CN113735526A discloses a soft soil hardening agent for sea area environment, which combines cement, ground fly ash, slag powder, gypsum and early strength activator to realize sea sludge and mucky soil with high water content, high organic matter and high salt content. However, this patent uses a portion of cement, and the production and use of cement has the following problems: 1) High energy consumption: the manufacture of cement requires a large amount of energy, making it a high energy-consuming material, which also makes its production environmentally friendly; 2) Carbon emission: cement production is an important source of carbon emissions because of the large amount of carbon dioxide generated during the manufacturing process, which is not compatible with the low carbon environmental protection advocated at present; 3) Hazardous waste: cement production produces large amounts of hazardous waste including hazardous industrial waste gases and toxic waste water at high temperatures. The main material of the curing agent is cement, and does not meet the low-carbon requirement.
Patent CN113880544a discloses a silt soft soil curing agent and a silt soft soil curing method, and the patent uses quicklime powder, cement, water glass, sodium hydroxide and phosphogypsum as an exciting agent to treat broken bricks, concrete fragments and mortar fragments generated in the house dismantling process, so that the broken bricks, concrete fragments and mortar fragments have certain hydration activity, and further the silt soft soil is cured. However, the solid waste components of the building are complex, the carbonization of the cement mortar is often serious, and the cement mortar is only treated by adopting the exciting agent, so that the hydration activity is limited. In addition, cement is still required in this solution. The main material of the curing agent is cement, which does not meet the low-carbon requirement.
Patent CN104045292 a discloses a curing agent for filling iron tailings and a preparation method thereof, after mixing tailing slurry and the curing agent, a paste with certain fluidity is injected into a mine by utilizing self gravity and a pump by utilizing a conveying pipeline, the mine is filled once or successively, the tailings are cured into an entity with certain strength by the curing agent, the main components in the iron tailings are ferric oxide minerals, silicate minerals and aluminum oxide minerals, and the difference between the main components and the soft soil components of the sludge with high organic matter content is too large, so that the curing agent is used for curing the soft soil of the sludge, and has the problem of difficult alkali excitation, and has poor curing effect.
Patent CN 116425461A discloses a tough geopolymer curing material for improving the soft soil property of silt and a preparation method, which is used as a soil curing agent to improve the soft soil property of the silt, but the proposal is not specific to the components of organic matters in the soft soil of the silt, the organic matters in the silt are acidic and can reduce the pH of a system, and the geopolymer curing is required to be carried out in a strong alkali environment, so that the curing effect of the curing agent for the soft soil of the silt is poor.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a low-carbon composite gel curing agent and a method for curing silt soft soil, which can solve the problems that the existing silt soft soil is difficult to cure and the setting time of slurry is difficult to regulate under the condition of not using cement. Hydration and inorganic polycondensation are carried out simultaneously through synergistic gelation, so that the high-strength solidified soil is prepared.
In order to achieve the above object, according to one aspect of the present invention, there is provided a low-carbon composite gel curing agent for reinforcing a silt soft soil, characterized in that the low-carbon composite gel curing agent comprises the following components in parts by mass:
Slag powder: 30-60 parts;
slag powder: 10-25 parts of a lubricant;
Fly ash: 5-20 parts;
Desulfurization ash: 2-10 parts;
slaked lime: 5-15 parts;
Retarder: 2-10 parts;
Exciting agent: 5-20 parts.
Preferably, the components of the low carbon composite gelling curing agent do not comprise cement.
Preferably, the steel slag powder, the fly ash and the desulfurized fly ash are all industrial solid wastes, and the sum of the mass of the industrial solid wastes is not less than 80% of the total mass of the low-carbon composite gelling curing agent;
the steel slag powder, the fly ash and the desulfurized ash are all preferably fine-ground powder, and the grain size is preferably 800-1250 meshes.
Preferably, the free calcium oxide content of the steel slag powder is not more than 3%, the water swelling rate is not more than 2%, and the fly ash preferably meets the standard of the secondary fly ash.
Preferably, the slag powder is white mineral prepared by crushing and ball milling blast furnace water quenched slag of a steel smelting plant, and the grain size is preferably 800-1250 meshes.
Preferably, the desulfurized fly ash is prepared by a rotary spraying method, and the calcium carbonate content is required to be more than 90%.
Preferably, the calcium oxide content of the slaked lime is not less than 90%, and the particle size is preferably 800-1250 mesh.
Preferably, the retarder consists of dihydrate gypsum and triethanolamine, the particle size is preferably 800-1250 meshes, and the mass ratio of the dihydrate gypsum to the triethanolamine is 3:1-9:1.
Preferably, the excitant is a mixture of industrial anhydrous sodium sulfate, industrial anhydrous sodium silicate and sodium hydroxide, wherein the modulus of the sodium silicate is 1.5-2.5, and the mass ratio of the industrial anhydrous sodium silicate to the sodium hydroxide is 3:1-9:1.
According to another aspect of the present invention, there is also provided a method for reinforcing a silt soft soil using the low-carbon composite gel curing agent, comprising the steps of:
1) Mixing the low-carbon composite gelling curing agent with water to obtain a pre-slurry;
2) And mixing the prefabricated slurry with the silt soft soil by a deep mixing pile method.
Preferably, in the step 1), the mass ratio of the water to the low-carbon composite gelling curing agent is 0.3-0.6.
Preferably, in the step 2), the organic matter content of the silt soft soil is 5% -10%;
the mixing ratio of the low-carbon composite gelling curing agent to the silt soft soil is 14% -25%, wherein the mixing ratio=the wet quality of the low-carbon composite gelling curing agent/the silt soft soil.
In general, the above technical solutions conceived by the present invention, compared with the prior art, can achieve the following beneficial effects:
1) The curing efficiency is high: the low-carbon composite gel curing agent can be used for curing silt soft soil in fresh water river, and is especially suitable for complex silt environments. As the silt soft soil in the fresh water river contains a large amount of acidic organic matters, the dissociated ions (H+) and acid radicals (R-), can react with Ca (OH) 2 in the cement paste to generate water and salt. When the H+ concentration reaches a certain concentration, the cement-based curing agent can directly act with calcium silicate hydrate and calcium aluminate hydrate, so that the slurry structure is seriously damaged, and the curing efficiency of the traditional cement-based curing agent is low. The curing agent disclosed by the invention contains slaked lime and desulfurized ash, can react with organic matters in sludge soft soil, improves the pH value of the sludge soft soil, creates an alkaline environment for hydration and inorganic polycondensation of materials in a system, reduces the influence of the organic matters on the system, and effectively improves the curing efficiency of the curing agent.
2) The strength of the solidified soil is high: the components in the curing agent of the invention have synergistic effect. On the one hand, under the action of the excitant, si-O, al-O bonds in the curing agent component are broken and are polymerized again to form Si-O-Al gel. In addition, tricalcium silicate and dicalcium silicate existing in the steel slag powder can also undergo hydration reaction to generate C-S-H gel, and the cross-linking effect of Si-O-Al gel and C-S-H gel can greatly improve the strength of solidified soil formed after the solidifying agent is added into silt soft soil.
3) The curing time can be regulated: by regulating and controlling the proportion of gypsum to triethanolamine, the construction property of the prefabricated slurry can be ensured, the excessive fast coagulation of the curing agent is avoided, the strength of a material system can be improved, and the adjustability of the coagulation time of the slurry is realized. On the one hand, gypsum can combine with calcium ions in the setting agent to produce calcium sulfate hydration products, which are generally in the form of cone and rod crystals, which fill in the colloidal interstices, extending the setting time of the setting agent. On the other hand, the triethanolamine is used as a surfactant, so that the charge state of the surface of the curing agent particles can be changed, the interaction among the particles is reduced, the triethanolamine can react with components in the curing agent, the reaction of tricalcium aluminate and gypsum is accelerated, ettringite is formed, and the setting time of the slurry is regulated.
In conclusion, the curing agent disclosed by the invention is especially suitable for the problem that the silt soft soil of the fresh water river is difficult to cure, so that the strength of the silt soft soil can be effectively improved, and the regulation and control of the curing time can be realized.
In addition, the main materials used by the curing agent are solid wastes such as steel slag powder, fly ash, desulfurized ash and the like, the mass ratio is more than 80%, and the cement consumption is zero. In addition, the strength of the solidified soil is greatly improved due to the synergistic gelation effect of the Si-O-Al gel and the C-S-H gel.
Drawings
Fig. 1 to 3 are SEM images of the undisturbed soil, blank 1 (42.5 portland cement), and the solidified soil of example 1, respectively, after SEM testing.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The invention discloses a curing agent which is prepared by respectively conveying steel slag powder, fly ash, desulfurized ash, slaked lime, gypsum, triethanolamine, anhydrous sodium silicate, sodium hydroxide and anhydrous sodium sulfate into a ball mill for grinding and uniformly mixing. When the curing agent is used for curing silt soft soil at the river bottom of a fresh water river, the silt soft soil is efficiently cured through the synergistic gelation, the strength of the silt soft soil can be obviously improved, and the related curing method is simpler, has lower cost and is suitable for popularization and application.
Specifically, the low-carbon composite gelling curing agent is used for reinforcing silt soft soil and comprises the following components in parts by weight:
Slag powder: 30-60 parts;
slag powder: 10-25 parts of a lubricant;
Fly ash: 5-20 parts;
Desulfurization ash: 2-10 parts;
slaked lime: 5-15 parts;
Retarder: 2-10 parts;
Exciting agent: 5-20 parts.
When the method is applied to sludge soft soil, tricalcium silicate and dicalcium silicate existing in steel slag powder can carry out hydration reaction to form C-S-H gel, so that the strength of the sludge soft soil is improved. The retarder plays a role in regulating and controlling the setting time of the curing agent, ensures the workability and is also beneficial to improving the strength of the cured soil. The excitation mechanism of the exciting agent on the steel slag is to promote the hydration of hydraulic minerals and accelerate the reaction.
Under the excitation of alkaline excitant, slag powder and fly ash are mixed with sludge soft soil containing aluminum clay to produce inorganic polycondensation reaction to form Si-O-Al gel.
The C-S-H gel and the Si-O-Al gel are synergetically gelled together to form an inorganic crosslinked network structure, so that the strength of the solidified soil formed after the low-carbon composite gelling curing agent is added into the silt soft soil is greatly improved.
The retarder has two functions, namely retarding, preventing the slurry from coagulating too fast, providing SO 4 2- for the system, promoting the generation of ettringite and increasing the strength.
Generally, the organic matter particles are smaller than most clay mineral particles, are round, have an undensified molecular structure and are flocculent, and contain more micropores, so that the water retention and adsorptivity of the organic matter are high. Therefore, the organic particles can be adsorbed on the surfaces of the curing agent particles and the clay particles, so that the curing reaction of the curing agent is delayed, and the combination of reaction products and the clay particles can be prevented. The desulfurized ash powder and the slaked lime powder can react with organic matters to improve the pH value of the system, which is favorable for hydration reaction of steel slag powder and inorganic polycondensation reaction of slag powder and fly ash, thereby being favorable for curing sludge soft soil.
Further, the components of the low-carbon composite gelling curing agent do not contain cement, but adopt a large amount of solid wastes such as steel slag powder, fly ash and desulfurization ash, so that the solid wastes are reused, and the cost can be reduced and the efficiency can be improved.
The organic matter content in the silt soft soil of the fresh water river is generally higher, the hydration reaction degree of cement in the silt soft soil is insufficient, the hardening effect is poor, the hydration reaction of steel slag powder is superior to cement in the generally higher organic matter content of the general higher organic matter content, and particularly, a large amount of steel slag powder is adopted, so that the hydration effect is good, and the solidification of solidified soil is facilitated.
The sum of the mass of the steel slag powder, the fly ash and the desulfurization ash is m 1, the total mass of the low-carbon composite gel curing agent is m 2, and m 1/m2 is more than or equal to 80 percent. The main components of the low-carbon composite gelling curing agent are steel slag powder, fly ash and desulfurized ash, solid waste is recycled, and C-S-H gel formed by hydration reaction of the steel slag powder and Si-O-Al gel formed by inorganic polycondensation reaction of the slag powder and the fly ash can improve the strength of the cured soil and are completely suitable for silt soft soil with higher organic matter content.
Further, the steel slag powder is powder after the fine grinding processing of the converter steel slag, and the grain size is preferably 800-1250 meshes (the grain size is expressed by the number of the grains, and the following is the same), the content of free calcium oxide is not more than 3%, the water-immersed expansion rate is not more than 2%, and the cracking of solidified soil due to the expansion of the steel slag powder is avoided.
After hydration and reaction of the steel slag powder, not only the water in the sludge soft soil is consumed, but also the strength of the soft soil sludge can be improved by the generated C-S-H gel product.
The solid waste steel slag generated in the steelmaking process is ground into steel slag powder with finer particles, the particle size is reduced, the specific surface area is increased, the activity is improved, and the hydration speed is increased. The too small particle size of the steel slag powder can cause the agglomeration of the steel slag powder and bring adverse effect on the gelation activity, and the too large particle size can reduce the activity of the steel slag powder, so that the particle size is 800-1250 meshes.
The free calcium oxide content is not more than 3%, the water soaking expansion rate is not more than 2%, and the free calcium oxide is an important factor of steel slag expansion cracking, and the steel slag powder in the curing agent is relatively high in proportion, so that the structure of the cured soil can be influenced due to the fact that the expansion rate of the steel slag powder is too high.
Further, the slag powder is white mineral prepared by crushing and ball milling blast furnace water quenched slag of a steel smelting plant, and the grain size is preferably 800-1250 meshes.
Generally, the finer the powder, the larger the specific surface area and the higher the activity, but the higher the cost, and the steel slag powder, fly ash, desulfurized ash, gypsum powder and lime powder with the particle size can meet the material requirement.
Further, the fly ash is required to meet the standard of the secondary fly ash, and the grade standard of the fly ash is too low, so that the inorganic polycondensation reaction is not facilitated.
Furthermore, the desulfurized ash is prepared by a rotary spraying method, the content of calcium carbonate needs to be more than 90%, and the too low content of calcium carbonate is unfavorable for treating organic matters.
Further, the gypsum powder is prepared by crushing and ball milling industrial gypsum, the particle size is preferably 800-1250 meshes, the main component is dihydrate gypsum, and the mass fraction of the dihydrate gypsum in the gypsum powder is not less than 90%. Too low a content of dihydrate gypsum can be detrimental to ettringite formation and to the improvement of the strength of the solidified soil.
Further, the calcium oxide content of the slaked lime is not less than 90%, and the particle size is preferably 800 to 1250 mesh. The chemical component of the slaked lime is Ca (OH) 2, and the business-in and business-out report of the slaked lime material generally represents the effective component in the slaked lime by the CaO content, and the higher the effective component is, the better the effect of treating organic matters is.
Further, the modulus of sodium silicate in the excitant is 1.5-2.5, and is determined by the mass ratio of industrial anhydrous sodium silicate to sodium hydroxide; the lower the modulus, the higher the alkali content of the activator, which is detrimental to the performance of the inorganic polycondensation reaction. The higher the modulus, the less alkali content, making the inorganic polycondensation difficult to carry out.
Further, the content of sodium sulfate in anhydrous sodium sulfate in the excitant is not less than 99%, and the higher the content of anhydrous sodium sulfate is, the better the excitation effect is.
According to another aspect of the present invention, there is also provided a method for curing silt soft soil using the low carbon composite gel curing agent, comprising the steps of:
1) Mixing the low-carbon composite gelling curing agent with water to obtain a pre-slurry;
2) And mixing the prefabricated slurry with the silt soft soil by a deep mixing pile method. The deep mixing pile method utilizes curing agent, and uses deep mixer to make the sludge soft soil and curing agent (slurry or powder, and preferred slurry) be forcedly mixed in situ under the river bottom surface so as to make the sludge soft soil be coagulated into solidified soil with good integrity and water stability and high strength.
Preferably, in the step 1), the mass ratio of the water to the low-carbon composite gelling curing agent is 0.3-0.6. The greater the water-cement ratio, the better the slurry fluidity, facilitating the mixing of the slurry with the sludge, but too high a water-cement ratio is detrimental to the curing of the curing agent.
Preferably, in the step 2), the organic matter content of the silt soft soil is 5% -10%;
The mixing ratio of the low-carbon composite gel curing agent powder and the silt soft soil is 14-25 percent (according to the JGJ/T233-2011 cement soil mixing ratio design rule, the cement mixing ratio is the ratio of the mass of the mixed cement to the wet mass of the reinforced soil, and the mixing ratio is expressed in percentage. If the mixing amount of the curing agent is insufficient, the silt soft soil is difficult to cure; excessive mixing amount can cause the solidified soil to be over-solidified and easy to crack.
In the following examples, the mesh numbers of the steel slag powder, the fly ash, the desulfurized fly ash, the gypsum powder and the lime powder are 800 meshes, the modulus of the initial anhydrous sodium silicate is 3.0, and the sodium silicate with the target modulus is prepared by adjusting the mass ratio of the sodium silicate to the sodium hydroxide. And preparing corresponding solidified soil according to the specification of cement soil mix proportion design rules (JGJT 233-2011).
Example 1
The embodiment provides a low-carbon composite gelling curing agent, which comprises the following components in parts by weight: 50 parts of steel slag powder; 15 parts of slag powder; 10 parts of fly ash powder; 5 parts of desulfurized fly ash; 5 parts of slaked lime; 5 parts of retarder; 10 parts of an exciting agent. Wherein the ratio of the dihydrate gypsum to the triethanolamine in the retarder is 5:1, the modulus of the sodium silicate in the excitant is 2.2, and the ratio of the sodium silicate to the sodium sulfate is 5:1.
The method for curing the silt soft soil by the low-carbon composite gel curing agent comprises the following steps:
1) And mixing the low-carbon composite gelling curing agent with water to obtain a pre-slurry, wherein the mass ratio of the water to the low-carbon composite gelling curing agent is 0.4.
2) And mixing the prefabricated slurry with the silt soft soil by a deep mixing pile method, wherein the organic matter content of the silt soft soil is 8.5%, and the mixing ratio of the low-carbon composite gel curing agent and the silt soft soil is 17%.
Example 2
The specific procedure is substantially the same as in example 1, except that the ratio of gypsum dihydrate to triethanolamine in the retarder is 3:1.
Example 3
The specific procedure is substantially the same as in example 1, except that the ratio of gypsum dihydrate to triethanolamine in the retarder is 7:1.
Example 4
The specific procedure is substantially the same as in example 1, except that the ratio of gypsum dihydrate to triethanolamine in the retarder is 9:1.
Example 5
The specific procedure is substantially the same as in example 1, except that the modulus of sodium silicate in the activator is 1.5.
Example 6
The specific procedure was the same as in example 1, except that the modulus of sodium silicate in the activator was 2.5.
Example 7
The procedure is substantially as in example 1, except that the ratio of sodium silicate to sodium sulfate in the activator is 3:1.
Example 8
The procedure is substantially as in example 1, except that the ratio of sodium silicate to sodium sulfate in the activator is 9:1.
Example 9
The specific procedure is the same as in example 1, except that 60 parts of steel slag powder; 10 parts of slag powder; 8 parts of fly ash powder; 5 parts of desulfurized fly ash; 15 parts of slaked lime; 2 parts of retarder; 5 parts of an exciting agent.
Example 10
The specific procedure is the same as in example 1, except that 30 parts of steel slag powder; 25 parts of slag powder; 8 parts of fly ash powder; 10 parts of desulfurized fly ash; 5 parts of slaked lime; 2 parts of retarder; 20 parts of an exciting agent.
Example 11
The specific procedure is the same as in example 1, except that 40 parts of steel slag powder; 10 parts of slag powder; 15 parts of fly ash powder; 2 parts of desulfurized fly ash; 15 parts of slaked lime; 8 parts of retarder; 10 parts of an exciting agent.
Example 12
The specific procedure is the same as in example 1, except that 40 parts of steel slag powder; 15 parts of slag powder; 20 parts of fly ash powder; 2 parts of desulfurized fly ash; 10 parts of slaked lime; 8 parts of retarder; 5 parts of an exciting agent.
Example 13
The specific procedure is the same as in example 1, except that 40 parts of steel slag powder; 15 parts of slag powder; 5 parts of fly ash powder; 5 parts of desulfurized fly ash; 10 parts of slaked lime; 10 parts of retarder; 15 parts of an exciting agent.
Example 14
The specific procedure was the same as in example 1, except that the mass ratio of water to the low-carbon composite gelling curing agent was 0.3.
Example 15
The specific procedure was the same as in example 1, except that the mass ratio of water to the low-carbon composite gelling curing agent was 0.6.
Example 16
The specific procedure is substantially the same as in example 1, except that the organic matter content of the sludge soft soil is 5%.
Example 17
The specific procedure is substantially the same as in example 1, except that the organic matter content of the sludge soft soil is 10%.
Example 18
The specific procedure was the same as in example 1, except that the mixing ratio of the low-carbon composite gel curing agent to the sludge soft soil was 14%.
Example 19
The specific procedure was the same as in example 1, except that the mixing ratio of the low carbon composite gel curing agent to the sludge soft soil was 25%.
Comparative example 1
This comparative example differs from example 1 in that slag powder and fly ash powder were eliminated, and the other configuration was identical to example 1.
Comparative example 2
This comparative example differs from example 1 in that the steel slag powder was eliminated and the other configuration was identical to example 1.
Comparative example 3
This comparative example differs from example 1 in that the desulfurized fly ash and slaked lime are eliminated, and the other configuration is identical to example 1.
Comparative example 4
This comparative example differs from example 1 in that the retarder was eliminated and the other configuration was identical to example 1.
Comparative example 5
This comparative example differs from example 1 in that the activator was omitted and the other configuration was identical to example 1.
Blank 1
The curing agent of the blank group is ordinary Portland cement 42.5, and the mixing ratio of the curing agent to sludge soft soil is 17%.
Blank group 2
The curing agent of the blank group is a commercial HAS curing agent, the main component is slag, gypsum, cement clinker and an activity excitant are doped, and the doping ratio of the curing agent to sludge soft soil is 17%.
The reinforced silt soft soil (solidified soil) of the examples, the comparative examples and the blank group is subjected to performance test by referring to the specification soft soil curing agent (CJ/T526-2018), and the unconfined compressive strength of the 7d and 28d ages and the initial setting time of the slurry are shown in the table 1.
Table 1 unconfined compressive strength table for solidified soil
The above results indicate that: by adopting the curing agent, the mechanical property of the obtained cured soil is obviously improved, the strength grade at least reaches 3.0, the slurry setting time can be realized by adjusting the proportion of the retarder, and the performance meets the standard requirement.
In order to further analyze the curing effect of the curing agent, a plurality of groups of relatively typical soil samples were selected, and the undisturbed soil, the blank 1, and the cured soil of example 1 were tested by SEM, and SEM images are shown in fig. 1, 2, and 3, respectively.
As shown by SEM results, the undisturbed soil has more pores and cracks on the surface, and after the cement is solidified, more needle-shaped products appear in the soil due to hydration, so that the soil has a solidification effect on the silt. And after the curing agent in the embodiment 1 is treated, the gel produced by the curing agent is in a block shape, and has better gelling effect on soil. The curative strength rating in example 1 reached 3.0R.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The low-carbon composite gelling curing agent for curing the silt soft soil is characterized by comprising the following components in parts by weight:
Slag powder: 30-60 parts;
slag powder: 10-25 parts of a lubricant;
Fly ash: 5-20 parts;
Desulfurization ash: 2-10 parts;
slaked lime: 5-15 parts;
Retarder: 2-10 parts;
Exciting agent: 5-20 parts.
2. A low carbon composite gelling curing agent for silt soft soil according to claim 1, wherein the components of said low carbon composite gelling curing agent do not contain cement.
3. The low-carbon composite gel curing agent for curing sludge soft soil according to claim 1, wherein the steel slag powder, the fly ash and the desulfurized fly ash are all industrial solid wastes, and the sum of the mass of the industrial solid wastes is not less than 80% of the total mass of the low-carbon composite gel curing agent;
the steel slag powder, the fly ash and the desulfurized ash are all preferably fine-ground powder, and the grain size is preferably 800-1250 meshes.
4. The low-carbon composite gel curing agent for curing sludge soft soil according to claim 1, wherein the free calcium oxide content of the steel slag powder is not more than 3%, the water swelling rate is not more than 2%, and the fly ash preferably meets the standard of secondary fly ash.
5. The low-carbon composite gelling curing agent for curing silt soft soil according to claim 1, wherein the retarder consists of dihydrate gypsum and triethanolamine, the particle size is preferably 800-1250 meshes, and the mass ratio of the dihydrate gypsum to the triethanolamine is 3:1-9:1.
6. The low-carbon composite gel curing agent for curing sludge soft soil according to claim 1, wherein the calcium oxide content of the slaked lime is not less than 90%, and the grain size is preferably 800-1250 mesh.
7. The low-carbon composite gel curing agent for curing sludge soft soil according to claim 1, wherein the exciting agent is a mixture of industrial anhydrous sodium sulfate, industrial anhydrous sodium silicate and sodium hydroxide, wherein the modulus of the industrial anhydrous sodium silicate is 1.5-2.5, the modulus of the industrial anhydrous sodium silicate is determined by the mass ratio of the industrial anhydrous sodium silicate to the sodium hydroxide, and the mass ratio of the sodium silicate to the sodium sulfate is 3:1-9:1.
8. A method for curing sludge soft soil by using the low-carbon composite gel curing agent as claimed in any one of claims 1 to 9, which is characterized by comprising the following steps:
1) Mixing the low-carbon composite gelling curing agent with water to obtain a pre-slurry;
2) And mixing the prefabricated slurry with the silt soft soil by a deep mixing pile method.
9. The method according to claim 10, wherein in the step 1), the mass ratio of the water to the low-carbon composite gel curing agent is 0.3 to 0.6.
10. The method according to claim 10, wherein in step 2), the organic matter content of the silt soft soil is 5% -10%;
the mixing ratio of the low-carbon composite gelling curing agent to the silt soft soil is 14% -25%, wherein the mixing ratio=the wet quality of the low-carbon composite gelling curing agent/the silt soft soil.
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