CN111348813A - Silt solidified soil with ultrahigh water stability - Google Patents
Silt solidified soil with ultrahigh water stability Download PDFInfo
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- CN111348813A CN111348813A CN202010218770.9A CN202010218770A CN111348813A CN 111348813 A CN111348813 A CN 111348813A CN 202010218770 A CN202010218770 A CN 202010218770A CN 111348813 A CN111348813 A CN 111348813A
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- solidified soil
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- water stability
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses sludge solidified soil with ultrahigh water stability, which comprises the following formula components in parts by weight: 95 parts of sludge with the organic matter content less than or equal to 10 percent, 2-3 parts of cement, 3-4 parts of lime, 2-3 parts of fly ash, 0.3-0.6 part of fluorocarbon resin emulsion, 0.6-1.2 parts of styrene-acrylic emulsion, 0.1-0.3 part of silane coupling agent and 0.1-0.2 part of surfactant. The water-stable sludge solidified soil takes sludge, cement, lime and fly ash as main raw materials, and engineering application performance of the prepared solidified soil is improved by adding fluorocarbon resin emulsion, styrene-acrylic emulsion, silane coupling agent and surfactant. The water stability of the solidified soil is improved by utilizing the fluorocarbon resin emulsion and the styrene-acrylic emulsion, and the fluorocarbon resin emulsion, the styrene-acrylic emulsion and the surface of the silt solidified soil are effectively combined by adding the silane coupling agent and the surfactant, so that the water stability of the solidified soil is enhanced, the problem that the unconfined compressive strength is reduced more under the dry-wet cycle condition of the silt solidified soil is solved to a greater extent, and the application field of the solidified soil is expanded.
Description
Technical Field
The invention belongs to the technical field of civil engineering materials, and particularly relates to silt solidified soil with ultrahigh water stability.
Background
The sludge solidified soil is used as a regenerative backfill civil engineering material and has the advantages of higher strength, less pollution, convenient construction, lower cost and the like. However, because the environment is usually a tidal zone or other zones with more dry-wet cycles, the impermeability of the solidified soil is reduced under the action of multiple dry-wet cycles, and the strength, the frost resistance and the erosion resistance of the silt solidified soil are directly influenced. When the sludge solidified soil is backfilled, if the hydrophobic property is poor, the strength of the solidified sludge at the bottom layer is low after multiple dry-wet cycles, the sludge solidified soil is easy to crack and even the foundation sinks under the action of external force, and meanwhile, the seepage-proofing performance of the engineering can be finally failed due to the solidified soil with poor hydrophobic property.
The hydrophobic property of the sludge solidified soil is improved, the strength loss of the solidified soil under the condition of dry-wet circulation is reduced, cracks after the dry-wet circulation are avoided, and the method has important significance for improving the service performance of the solidified soil under the dry-wet alternate environment.
Disclosure of Invention
In order to solve the problems, the invention discloses sludge solidified soil with ultrahigh water stability, which utilizes the strong hydrophobic property of fluorocarbon resin, combines styrene-acrylic emulsion and other functional additives, obviously improves the hydrophobic property of the sludge solidified soil, can obviously improve the construction benefit, reduces the strength loss of the sludge solidified soil material, and improves the economic and environmental benefits.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a silt solidified soil with ultrahigh water stability comprises silt with the organic matter content less than or equal to 10 percent, cement, lime, fly ash, fluorocarbon resin emulsion, styrene-acrylic emulsion, silane coupling agent and surfactant; the components by weight portion are 95 portions of silt, 2 to 3 portions of cement, 3 to 4 portions of lime, 2 to 3 portions of fly ash, 0.3 to 0.6 portion of fluorocarbon resin emulsion, 0.6 to 1.2 portions of styrene-acrylic emulsion, 0.1 to 0.3 portion of silane coupling agent and 0.1 to 0.2 portion of surfactant.
Preferably, the selected cement is P · O42.5 portland cement.
Preferably, the lime is calcareous quicklime 90, and the fly ash is fly ash above grade II.
Preferably, the fluorine content of the selected fluorocarbon resin emulsion is more than or equal to 10 percent by mass.
Preferably, the styrene-acrylic emulsion is selected to have a solids content of 45-50%.
Preferably, the silane coupling agent selected is at least one of ethyl orthosilicate, methyltrimethylsilane, methyltriethoxysilane, n-propyltriethoxysilane, n-dodecyltrimethoxysilane, 3-aminopropyltriethoxysilane, gamma-glycidoxypropyltrimethoxysilane, gamma- (methacryloyloxy) propyltrimethoxysilane, gamma-mercaptopropyltriethoxysilane, vinyltrimethoxysilane, vinyltris (gamma-methoxyethoxy) silane, bis- (trimethoxysilylpropyl) amine, bis- (triethoxysilylpropyl) amine, 1, 2-bis (trimethoxysilyl) ethane, 3,3, 3-trifluoropropyltriethoxysilane, or dodecafluoroheptylpropyltrimethoxysilane.
Preferably, the selected surfactant is alkylphenol ethoxylates.
The invention has the beneficial effects that:
(1) the invention designs and develops a silt solidified soil material with ultrahigh water stability by utilizing the strong hydrophobic property of fluorocarbon resin. Because the fluorocarbon resin has better crystallinity, a hydrophobic film can be formed on the surface of the sludge solidified soil under the action of the styrene-acrylic emulsion and other functional additives, and the water stability of the sludge solidified soil is obviously improved;
(2) the invention selects silane coupling agent to connect inorganic mineral in the silt with fluorocarbon resin and organic functional group in the styrene-acrylic emulsion, the oxygen group in the silane has reactivity to the inorganic substance, the organic functional group has reactivity or compatibility to the organic substance; when the silane coupling agent acts between inorganic matters and fluorocarbon resin in the sludge, a layer of organic matrix-silane coupling agent-inorganic matrix binding layer can be formed, and the effective binding of the fluorocarbon resin and crystal phase in the sludge is ensured;
(3) the invention designs a sludge solidified soil material with ultrahigh water stability by taking fluorocarbon emulsion and styrene-acrylic emulsion as main raw materials and combining other functional auxiliaries, and effectively improves the mechanical properties of solidified soil under dry-wet alternation.
Detailed Description
The present invention will be further illustrated below with reference to specific embodiments, which are to be understood as merely illustrative and not limitative of the scope of the present invention.
The invention comprises the following components in parts by weight: 95 parts of sludge, 2-3 parts of cement, 3-4 parts of lime, 2-3 parts of fly ash, 0.3-0.6 part of fluorocarbon resin emulsion, 0.6-1.2 parts of styrene-acrylic emulsion, 0.1-0.3 part of silane coupling agent and 0.1-0.2 part of surfactant.
The sludge is taken from a certain region of the Jiangsu salt city; the cement is produced from a certain cement factory in Nanjing, and the specification is P.O 42.5; the lime is produced by a company of Xuan city in Anhui, and the specification is 170 meshes; the fly ash is produced from a certain power plant in Nanjing; the fluorocarbon resin emulsion is PFA9000 water-based fluorocarbon emulsion produced by some new material company, Inc. in Shanghai; the styrene-acrylic emulsion is produced from a chemical product company Limited in Henan; the silane coupling agent is KH-550 (3-aminopropyl triethoxysilane) produced by Shandong chemical industry Co., Ltd, and has effective substance content of 98% or more; the surfactant is OP-4 (alkylphenol polyoxyethylene), produced by chemical company Limited in Jiangsu.
The test specimens were removed for standard curing 28D and subjected to dry-wet cycle testing according to the method of reference (ASTM) D4843-88. Meanwhile, the test piece which is maintained for 28d is taken out, wiped to dry the surface water stain and then weighed, then the test piece is placed in the water which is completely soaked for 30d at the temperature of 20 ℃ and then taken out, the surface water stain is wiped to dry and then weighed, and the mass increase rate after water absorption is measured.
The first embodiment is as follows:
the sludge solidified soil with ultrahigh water stability comprises the following components in parts by weight: 95 parts of sludge, 3 parts of cement, 4 parts of lime, 3 parts of fly ash, 0.6 part of fluorocarbon resin emulsion, 1.2 parts of styrene-acrylic emulsion, 0.3 part of silane coupling agent and 0.2 part of surfactant. After the sludge is solidified, the unconfined compressive strength of the sludge at the standard curing time of 28d is 300 kPa. After 10 times of dry-wet cycles, the unconfined compressive strength loss rate of the sludge solidified soil is 0.5%, and the mass increase rate of the sludge solidified soil after 30d of water immersion is 0.2%.
Example two:
the sludge solidified soil with ultrahigh water stability comprises the following components in parts by weight: 95 parts of sludge, 3 parts of cement, 4 parts of lime, 3 parts of fly ash, 0.5 part of fluorocarbon resin emulsion, 1.0 part of styrene-acrylic emulsion, 0.3 part of silane coupling agent and 0.2 part of surfactant. After the sludge is solidified, the unconfined compressive strength of the sludge in the standard curing of 28d is 280 kPa. After 10 times of dry-wet cycles, the unconfined compressive strength loss rate of the sludge solidified soil is 0.7%, and the mass increase rate of the sludge solidified soil after 30d of soaking is 0.3%.
Example three:
the sludge solidified soil with ultrahigh water stability comprises the following components in parts by weight: 95 parts of sludge, 3 parts of cement, 4 parts of lime, 3 parts of fly ash, 0.4 part of fluorocarbon resin emulsion, 0.8 part of styrene-acrylic emulsion, 0.2 part of silane coupling agent and 0.1 part of surfactant. After the sludge is solidified, the unconfined compressive strength of the sludge in the standard curing of 28d is 264 kPa. After 10 times of dry-wet cycles, the unconfined compressive strength loss rate of the sludge solidified soil is 0.8%, and the mass increase rate of the sludge solidified soil after 30d of water immersion is 0.5%.
Example four:
the sludge solidified soil with ultrahigh water stability comprises the following components in parts by weight: 95 parts of sludge, 3 parts of cement, 4 parts of lime, 3 parts of fly ash, 0.3 part of fluorocarbon resin emulsion, 0.6 part of styrene-acrylic emulsion, 0.1 part of silane coupling agent and 0.1 part of surfactant. After the sludge is solidified, the unconfined compressive strength of the sludge in the standard curing of 28d is 239 kPa. After 10 times of dry-wet cycles, the unconfined compressive strength loss rate of the sludge solidified soil is 1.0 percent, and the mass increase rate of the sludge solidified soil after 30 days of soaking is 0.6 percent.
Comparative example one:
the sludge solidified soil with ultrahigh water stability comprises the following components in parts by weight: 95 parts of sludge, 3 parts of cement, 4 parts of lime, 3 parts of fly ash, 0.1 part (too little) of fluorocarbon resin emulsion, 1.0 part of styrene-acrylic emulsion, 0.1 part of silane coupling agent and 0.1 part of surfactant. After the sludge is solidified, the unconfined compressive strength of the sludge in the standard curing 28d is 220 kPa. After 10 times of dry-wet cycles, the unconfined compressive strength loss rate of the sludge solidified soil is 11.2%, and the mass increase rate of the sludge solidified soil after 30d of soaking is 10.3%.
Comparative example two:
the sludge solidified soil with ultrahigh water stability comprises the following components in parts by weight: 95 parts of sludge, 3 parts of cement, 4 parts of lime, 3 parts of fly ash, 0.5 part of fluorocarbon resin emulsion, 0.3 part (too little) of styrene-acrylic emulsion, 0.1 part of silane coupling agent and 0.1 part of surfactant. After the sludge is solidified, the unconfined compressive strength of the sludge at standard curing 28d is 337 kPa. After 10 times of dry-wet cycles, the unconfined compressive strength loss rate of the sludge solidified soil is 13.6%, and the mass increase rate of 30d of immersed water is 12.1%.
Comparative example three:
the sludge solidified soil with ultrahigh water stability comprises the following components in parts by weight: 95 parts of sludge, 3 parts of cement, 4 parts of lime, 3 parts of fly ash, 0.8 part of fluorocarbon resin emulsion, 1.0 part of styrene-acrylic emulsion, 0.05 part (too little) of silane coupling agent and 0.1 part of surfactant. After the sludge is solidified, the unconfined compressive strength of the sludge in the standard curing of 28d is 280 kPa. After 10 times of dry-wet cycles, the unconfined compressive strength loss rate of the sludge solidified soil is 12.1%, and the mass increase rate after 30 days of soaking is 13.7%.
The conclusion is that: the solidified soil prepared according to the weight parts of the components has high water stability, the unconfined compressive strength loss rate after 10 dry-wet cycles is not more than 5 percent at most, and the mass increase rate after the soil is completely soaked in water for 30 days is not more than 1 percent. However, if the amounts of the fluorocarbon resin emulsion, the styrene-acrylic emulsion and the silane coupling agent do not meet the requirements, the unconfined compressive strength loss rate can reach or exceed 10 percent, the water absorption quality increase rate after the sludge is completely soaked for 30 days exceeds 10 percent, the unconfined compressive strength of the sludge solidified soil is seriously influenced, and the engineering application is influenced.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.
Claims (7)
1. The sludge solidified soil with ultrahigh water stability is characterized by comprising sludge with the organic matter content of less than or equal to 10%, cement, lime, fly ash, fluorocarbon resin emulsion, styrene-acrylic emulsion, silane coupling agent and surfactant; the weight parts of each component are as follows: 95 parts of sludge, 2-3 parts of cement, 3-4 parts of lime, 2-3 parts of fly ash, 0.3-0.6 part of fluorocarbon resin emulsion, 0.6-1.2 parts of styrene-acrylic emulsion, 0.1-0.3 part of silane coupling agent and 0.1-0.2 part of surfactant.
2. The silt-solidified soil having an ultra-high water stability according to claim 1, wherein the cement is P-O42.5 portland cement.
3. The silt solidified soil with ultrahigh water stability of claim 1, wherein the lime is calcareous quicklime 90, and the fly ash is class II or more fly ash.
4. The silt solidified soil with ultrahigh water stability of claim 1, wherein the fluorine content in the fluorocarbon resin emulsion is not less than 10% by mass.
5. The silt solidified soil with ultra-high water stability of claim 1, wherein the styrene-acrylic emulsion has a solid content of 40-45%.
6. The sludge-solidified soil having an ultrahigh water stability as claimed in claim 1, wherein the silane coupling agent is tetraethoxysilane, methyltrimethylsilane, methyltriethoxysilane, n-propyltriethoxysilane, n-dodecyltrimethoxysilane, 3-aminopropyltriethoxysilane, γ -glycidoxypropyltrimethoxysilane, γ - (methacryloyloxy) propyltrimethoxysilane, γ -mercaptopropyltriethoxysilane, vinyltrimethoxysilane, vinyltris (γ -methoxyethoxy) silane, bis- (trimethoxysilylpropyl) amine, bis- (triethoxysilylpropyl) amine, 1, 2-bis (trimethoxysilyl) ethane, 3,3, 3-trifluoropropyltriethoxysilane, or dodecafluoroheptylpropyltrimethoxysilane.
7. The silt solidified soil with ultra-high water stability of claim 1, wherein the surfactant is alkylphenol ethoxylate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010218770.9A CN111348813A (en) | 2020-03-25 | 2020-03-25 | Silt solidified soil with ultrahigh water stability |
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| CN202010218770.9A CN111348813A (en) | 2020-03-25 | 2020-03-25 | Silt solidified soil with ultrahigh water stability |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114380564A (en) * | 2021-12-29 | 2022-04-22 | 江西远洋威利实业有限公司 | Fiber cement board for FCB assembly type steel structure integration and preparation method thereof |
| CN117209121A (en) * | 2023-11-07 | 2023-12-12 | 长大市政工程(广东)有限公司 | Sludge drying agent and method for improving sludge drying speed |
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Application publication date: 20200630 |