CN115849775A - High-water-content anti-scouring sludge solidification grouting material and preparation method and application thereof - Google Patents
High-water-content anti-scouring sludge solidification grouting material and preparation method and application thereof Download PDFInfo
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- CN115849775A CN115849775A CN202211453968.0A CN202211453968A CN115849775A CN 115849775 A CN115849775 A CN 115849775A CN 202211453968 A CN202211453968 A CN 202211453968A CN 115849775 A CN115849775 A CN 115849775A
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Abstract
The invention discloses an anti-scouring sludge solidification grouting material with high water content, a preparation method and an application thereof, wherein the anti-scouring sludge solidification grouting material comprises, by weight, 10-16 parts of cement, 35-42 parts of sludge, 1-10 parts of an optimizing agent and 40-45 parts of water. The optimizing agent comprises the following components in parts by weight: 0.2 to 0.6 portion of flocculating agent, 0.1 to 0.2 portion of defoaming agent and 0 to 8 portions of accelerating agent. The high-water-content anti-scouring sludge solidifying and grouting material provided by the invention has stronger anti-scouring performance, fluidity and mechanical strength, and utilizes marine useless sludge resources to change wastes into valuables and realize the stability of the offshore wind power pile foundation.
Description
Technical Field
The invention belongs to the technical field of marine civil engineering materials, and particularly relates to an anti-scouring sludge solidification grouting material with high water content and a preparation method and application thereof.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
In recent years, the construction of offshore wind farms by using offshore wind resources has become a new trend in our country in the field of new energy applications. However, after the offshore wind power pile is built, due to the influence of natural environments (hydrology and geology) in the sea area, the mud surface of the seabed can descend, the pile foundation is hollowed out, the pile foundation vibrates and inclines, the safety of the pile foundation structure is greatly threatened, and necessary anti-scouring measures need to be taken, namely an effective protection area is formed at the bottom of the pile, the stability of the pile foundation is ensured, and the effective protection area is formed. At present, most of traditional pile foundation anti-scour protection methods utilize physical methods for protection, such as stone quilt/gabion, sand bag/sand quilt, concrete interlocking row and the like. However, the traditional protection methods adopted at present all have certain defects, and the requirements of actual engineering are difficult to meet. The stone quilt/gabion protection method, the construction process and the grading have great influence on the protection effect; the pile foundation is easy to be damaged when the pile is thrown and filled; and the throwing efficiency is low, and the hoisting frequency of the gabion is high. The geotextiles of the sand bags/sand quilts are easy to be damaged, so that sand and stone are leaked; the contact surface of the sand bag and the pile foundation is difficult to be completely contacted. The sealing performance of the edge or gap part of the concrete interlocking row is poor, so that the lower part is easily corroded to influence the protection effect; as a hard material, concrete is prone to causing secondary damage to pile foundations. Therefore, it is urgently needed to develop a grouting material with strong erosion resistance, so that the grouting material can meet the requirement of stabilizing the pile foundation.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide an anti-scouring sludge solidification grouting material with high water content, a preparation method and application. The material has stronger anti-scouring performance and can not be dispersed in water; the fluidity is strong, and the self-leveling requirement can be met; the extremely low bleeding rate ensures the maturing rate of the material, has higher strength and meets the requirement of stabilizing the pile foundation.
In order to realize the purpose, the technical scheme of the invention is as follows:
the first aspect is that the high-water-content anti-scouring sludge solidification grouting material is characterized by comprising, by weight, 10-16 parts of cement, 35-42 parts of sludge, 1-10 parts of an optimizing agent and 40-45 parts of water.
The optimizing agent comprises the following components in parts by weight: 0.2 to 0.6 portion of flocculating agent, 0.1 to 0.2 portion of defoaming agent and 0 to 8 portions of accelerating agent.
The invention solidifies the silt through the cement, utilizes the hydration reaction that the cement meets the water to generate a series of cementation hydration products, including calcium hydroxide, calcium silicate hydrate, calcium aluminate hydrate, calcium sulphoaluminate hydrate and the like, provides cementation between silt soil particles, and ensures that the silt has certain strength.
The invention adopts the flocculating agent as the optimizing agent to obviously improve the water scouring resistance of the slurry. The defoaming agent can eliminate bubbles in the sludge and caused by the doping of the flocculating agent, and eliminate the influence of the bubbles on the strength. The accelerator accelerates the reaction speed of cement, generates a large amount of cementing hydration products in a short time, can improve the strength and can ensure that the solidified sludge is not dispersed when meeting water.
In a second aspect, the preparation method of the high-water-content anti-scouring sludge solidification grouting material comprises the following steps:
mixing an optimizing agent and water to prepare a liquid component;
mixing the liquid component with the sludge, and stirring the mixture until the mixture is uniform;
and mixing the cement with the uniformly mixed sludge solution, and continuously stirring until the mixture is uniform.
In a third aspect, the high-water-content anti-scouring sludge solidification grouting material is applied to anti-scouring protection of the foundation of the offshore wind power pile.
And fourthly, the anti-scouring protection method for the offshore wind power pile foundation comprises the steps of pumping the anti-scouring sludge solidification grouting material with high water content to the surface of the sea bed around the pile foundation by using a pipeline, and enabling the anti-scouring sludge solidification grouting material to automatically flow to a range needing protection by means of controllable slurry fluidity.
The invention has the beneficial effects that:
(1) The high-water-content anti-scouring sludge solidification grouting material has high anti-dispersion performance, and can ensure that slurry reaches the sea level under the action of water flow scouring. The grouting material has the self-leveling characteristic, and the grout can flow to the area needing protection from the main flow.
(2) After the grouting material is cured, the cohesive force and the internal friction angle of the sludge are greatly improved, and the volume stability of the solidified sludge can be ensured. Meanwhile, the material has higher compressive strength, and can prevent the need of vibration, inclination and settlement of the pile foundation.
(3) The invention utilizes a small amount of cement and an optimizing agent to solidify the seabed sludge, can bond particles in the sludge, and improves the strength of the sludge so as to control the stability of the pile foundation. Not only solves the difficult problem that the sludge is difficult to utilize, but also reduces the material cost.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention.
FIG. 1 is a graph showing the comparison between example 1 of the grouting material of the present invention and a conventional portland cement slurry against running water, in which FIG. 1 (a) is a conventional portland cement slurry and FIG. 1 (b) is a grouting material of the present invention.
Fig. 2 is a graph comparing underwater grouting with a general portland cement slurry in case of example 1 of a grouting material of the present invention, wherein fig. 2 (a) is a general portland cement slurry and fig. 2 (b) is a grouting material of the present invention.
FIG. 3 is a microscopic scanning electron microscope image of the grouting material of example 1 of the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The offshore wind power pile foundation is easy to vibrate, incline and settle under the action of waves and ocean currents, and the seabed sludge is difficult to keep stable in volume under the action of wave and ocean current scouring due to high water content, low strength and low permeability, so that the offshore wind power pile foundation is the main reason for causing the inclination and settlement of the pile foundation. The invention provides a high-water-content scouring-resistant sludge solidification grouting material, a preparation method and application thereof.
The invention provides a high-water-content anti-scouring sludge solidification grouting material, which comprises, by weight, 10-16 parts of cement, 35-42 parts of sludge, 1-10 parts of an optimizing agent and 40-45 parts of water; the strength of the grouting material is reduced due to too little cement mixing amount, the dispersion resistance is weak due to low mixing amount of the optimizing agent, and the performance requirement is difficult to meet; on the basis of meeting the basic performance, the cost is improved due to excessive mixing amount, and the cement and the optimizing agent are controlled within the range, so that the grouting material can be ensured to have higher strength and higher anti-dispersion performance, and meanwhile, the cost cannot be increased.
The optimizing agent comprises the following components in parts by weight: 0.2-0.6 part of flocculating agent, 0.1-0.2 part of defoaming agent and 0-8 parts of accelerating agent, wherein the flocculating agent, the defoaming agent and the accelerating agent in the weight part range can ensure that the prepared grouting material has good anti-dispersion performance, the anti-dispersion performance of the grouting material is influenced when the content of the flocculating agent and the defoaming agent is small, the fluidity of the grouting material is influenced when the content of the flocculating agent and the defoaming agent is large, and the cost is increased.
The seabed sludge is the cause of instability and settlement of the pile foundation due to high water content, low strength, low permeability and low stability. The traditional method for treating the sludge comprises dumping and hydraulic filling, but has the defects of long construction period, pollution to marine environment and the like. The cement can generate a series of cementitious hydration products including calcium hydroxide, calcium silicate hydrate, calcium aluminate hydrate, calcium sulphoaluminate hydrate and the like by hydration reaction when meeting water, and provides a cementing effect among silt particles so that the silt has certain strength.
The flocculant can obviously improve the water scouring resistance of the slurry. The defoaming agent can eliminate bubbles in the sludge and caused by the doping of the flocculating agent, and eliminate the influence of the bubbles on the strength. The accelerator accelerates the reaction speed of cement, generates a large amount of cementing hydration products in a short time, can improve the strength and can ensure that the solidified sludge is not dispersed when meeting water.
In some examples of this embodiment, the flocculant is one of hydroxypropyl methylcellulose ether, hydroxypropyl methylcellulose, hydroxyethyl methylcellulose, hydroxymethyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose, preferably hydroxypropyl methylcellulose ether, and has a viscosity of 200000 mPa-s, and the hydroxypropyl methylcellulose ether has good compatibility with cement particles and strong flocculation effect.
In some examples of this embodiment, the defoamer is one of a mineral oil defoamer, a silicone defoamer and a polyether defoamer, preferably a mineral oil defoamer, and can be basf defoamer a2190, which is a mineral oil defoamer and is less polluting to sea.
In some examples of this embodiment, the accelerator is one of liquid water glass, sodium silicate, aluminum sulfate and sodium metaaluminate, preferably liquid water glass, the modulus is 3.3, the baume degree is 38, and the liquid water glass has strong quick-setting property, and can greatly improve the viscosity of the slurry within tens of seconds.
The invention further provides a preparation method of the high-water-content anti-scouring sludge solidification grouting material, which comprises the following steps of:
mixing an optimizing agent with water to prepare a liquid component;
mixing the liquid component with the sludge, and stirring the mixture until the mixture is uniform;
mixing the cement with the uniformly mixed sludge solution, and continuously stirring until the mixture is uniform; the cement is hydrated when meeting water to generate a series of cementitious hydration products, so that a cementing effect is provided among silt particles, and the silt has certain strength.
In some examples of this embodiment, the flocculant, the defoamer and the accelerator are mixed in proportion and stirred uniformly to obtain the optimizing agent.
In some examples of this embodiment, the slurry is stirred for 3 minutes after the cement is added, resulting in a slurry with good fluidity and suitable cohesiveness, and excellent resistance to dispersion.
The third embodiment of the invention provides application of the high-water-content anti-scouring sludge solidification grouting material in anti-scouring protection of an offshore wind power pile foundation.
According to a fourth embodiment of the invention, an anti-scouring protection method for an offshore wind power pile foundation is provided, wherein the anti-scouring sludge solidification grouting material with high water content is pumped to the surface of the sea bed around the pile foundation by a pipeline, and automatically flows to a range needing protection by means of controllable slurry fluidity.
In some examples of this embodiment, curing is carried out under water at a curing temperature of 15 to 25 ℃.
In the following examples, the flocculant is hydroxypropyl methylcellulose, the defoamer is a basf defoamer, and the accelerator is liquid water glass.
Example 1
A high-water-content anti-scouring sludge solidification grouting material and a preparation method thereof comprise the following steps:
the method comprises the following steps: the performance optimizing agent is prepared from the following components in parts by mass: 0.5 part of flocculant, 0.15 part of defoamer and 5.5 parts of accelerator.
Step two: weighing raw materials according to the mass parts, wherein the raw materials comprise 10.5 parts of cement, 41.35 parts of sludge, 6.15 parts of optimizing agent and 42 parts of water.
Step three: and fully stirring the weighed raw materials according to the preparation method sequence of the composite material.
Step four: and forming the stirred material, and maintaining the formed material in a water environment at the temperature of 20 ℃ for 28 days.
Comparing the grouting material of the present embodiment with ordinary portland cement grout, as shown in fig. 1 and fig. 2, it can be seen that the grouting material of the present embodiment has better anti-dispersion property and anti-flowing water scouring property than ordinary portland cement grout, and can satisfy grouting in seawater.
The microscopic scanning electron microscope image of the grouting material of the embodiment is shown in fig. 3, and it can be seen that cement hydration generates compact hydration products which can connect silt particles, and the overall strength of the grouting material is improved.
The fluidity, dispersibility, compressive strength and cost of the high water content anti-scouring sludge solidification grouting material prepared in the embodiment are shown in table 1:
TABLE 1 Properties of the products
Example 2
A high-water-content anti-scouring sludge solidification grouting material and a preparation method thereof comprise the following steps:
the method comprises the following steps: the performance optimizing agent is prepared from the following components in parts by mass: 0.5 part of flocculant, 0.15 part of defoamer and 5.5 parts of accelerator.
Step two: weighing raw materials according to 136 parts by mass, wherein the raw materials comprise 15.5 parts of cement, 36.35 parts of sludge, 6.15 parts of optimizing agent and 42 parts of water.
Step three: and fully stirring the weighed raw materials according to the preparation method sequence of the composite material.
Step four: and forming the stirred material, and maintaining the material in a water environment at 20 ℃ for 28 days.
The fluidity, dispersibility, compressive strength and cost of the high water content anti-scouring sludge solidification grouting material prepared in the embodiment are shown in table 2:
TABLE 2 Properties of the products
Example 3
A high-water-content anti-scouring sludge solidification grouting material and a preparation method thereof comprise the following steps:
the method comprises the following steps: the performance optimizing agent is prepared from the following components in parts by mass: 0.25 part of flocculant, 0.15 part of defoamer and 5.5 parts of accelerator.
Step two: weighing raw materials including 15.5 parts of cement, 36.6 parts of sludge, 5.9 parts of an optimizing agent and 42 parts of water in parts by mass.
Step three: and fully stirring the weighed raw materials according to the preparation method sequence of the composite material.
Step four: and forming the stirred material, and maintaining the formed material in a water environment at the temperature of 20 ℃ for 28 days.
The fluidity, dispersibility, compressive strength and cost of the high water content anti-scouring sludge solidification grouting material prepared in the embodiment are shown in table 3:
TABLE 3 Properties of the products
Example 4
A high-water-content anti-scouring sludge solidification grouting material and a preparation method thereof comprise the following steps:
the method comprises the following steps: the performance optimizing agent is prepared from the following components in parts by mass: 0.35 part of flocculant, 0.15 part of defoamer and 5.5 parts of accelerator.
Step two: weighing raw materials including 15.5 parts of cement, 36.5 parts of sludge, 6 parts of an optimizing agent and 42 parts of water according to parts by mass.
Step three: and fully stirring the weighed raw materials according to the preparation method sequence of the composite material.
Step four: and forming the stirred material, and maintaining the formed material in a water environment at the temperature of 20 ℃ for 28 days.
The fluidity, dispersibility, compressive strength and cost of the high water content anti-scouring sludge solidification grouting material prepared in the embodiment are shown in table 4:
TABLE 4 Properties of the products
Example 5
A high-water-content anti-scouring sludge solidification grouting material and a preparation method thereof comprise the following steps:
the method comprises the following steps: the performance optimizing agent is prepared from the following components in parts by mass: 0.5 part of flocculant, 0.15 part of defoamer and 2.5 parts of accelerator.
Step two: weighing raw materials including 15.5 parts of cement, 39.35 parts of sludge, 3.15 parts of an optimizing agent and 42 parts of water according to parts by mass.
Step three: and fully stirring the weighed raw materials according to the preparation method sequence of the composite material.
Step four: and forming the stirred material, and maintaining the formed material in a water environment at the temperature of 20 ℃ for 28 days.
The fluidity, dispersibility, compressive strength and cost of the high water content anti-scouring sludge solidification grouting material prepared in this example are shown in table 5:
TABLE 5 Properties of the products
From examples 1-5, it can be seen that the cement content has a great influence on the compressive strength, and that the flocculating agent and accelerator have a great influence on the cost of the material. The small-amplitude reduction of the flocculating agent and the accelerating agent can improve the fluidity of the material, and the anti-dispersion property is slightly reduced. In conclusion, the repair material has better performance and can be used as a grouting material.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The high-water-content anti-scouring sludge solidification grouting material is characterized by comprising, by weight, 10-16 parts of cement, 35-42 parts of sludge, 1-10 parts of an optimizing agent and 40-45 parts of water.
2. The high water content anti-scour sludge solidification grouting material as claimed in claim 1, wherein the optimizing agent comprises, in parts by weight: 0.2 to 0.6 portion of flocculating agent, 0.1 to 0.2 portion of defoaming agent and 0 to 8 portions of accelerating agent.
3. The high water content scour resistant sludge setting grouting material of claim 2, wherein the flocculant is one of hydroxypropyl methyl cellulose ether, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, preferably hydroxypropyl methyl cellulose ether.
4. The high water content scour resistant sludge solidification grouting material of claim 2, wherein the defoamer is one of a mineral oil defoamer, a silicone defoamer and a polyether defoamer, preferably a mineral oil defoamer.
5. The high-water-content anti-scouring sludge solidification grouting material as claimed in claim 2, wherein the accelerating agent is one of liquid water glass, sodium silicate, aluminum sulfate and sodium metaaluminate, and is preferably liquid water glass.
6. A preparation method of the high-water-content anti-scouring sludge solidification grouting material as claimed in any one of claims 1 to 5 is characterized by comprising the following steps of:
mixing an optimizing agent and water to prepare a liquid component;
mixing the liquid component with the sludge, and stirring the mixture until the mixture is uniform;
and mixing the cement with the uniformly mixed sludge solution, and continuously stirring until the mixture is uniform.
7. The method for preparing the high-water-content scouring-resistant sludge solidification grouting material as claimed in claim 6, wherein a flocculating agent, a defoaming agent and an accelerating agent are mixed in proportion and stirred uniformly to obtain an optimizing agent.
8. The application of the high-water-content anti-scouring sludge solidification grouting material as claimed in any one of claims 1 to 5 in anti-scouring protection of the foundation of the offshore wind power pile.
9. An anti-scouring protection method for an offshore wind power pile foundation, which is characterized in that the high-water-content anti-scouring sludge solidification grouting material disclosed by any one of claims 1 to 5 is pumped to the surface of the sea bed around the pile foundation by a pipeline and automatically flows to a range needing protection by means of controllable slurry fluidity.
10. An anti-scour protection method for an offshore wind power pile foundation according to claim 9, wherein the maintenance is performed underwater.
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| CN107098661A (en) * | 2017-04-21 | 2017-08-29 | 武汉理工大学 | It is a kind of to resist scattered fast repairing material and preparation method thereof under water |
| CN109553346A (en) * | 2018-12-11 | 2019-04-02 | 太原理工大学 | A kind of compound slurry and preparation method thereof used under river channels |
| CN111072366A (en) * | 2019-12-30 | 2020-04-28 | 浙江斯力柯新材料科技有限公司 | Inorganic grouting material capable of stopping open water and reinforcing structure and preparation method and application thereof |
| CN111995339A (en) * | 2020-07-16 | 2020-11-27 | 天津大学前沿技术研究院有限公司 | Anti-scouring solidified soil for ocean platform and preparation method thereof |
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- 2022-11-21 CN CN202211453968.0A patent/CN115849775A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107098661A (en) * | 2017-04-21 | 2017-08-29 | 武汉理工大学 | It is a kind of to resist scattered fast repairing material and preparation method thereof under water |
| CN109553346A (en) * | 2018-12-11 | 2019-04-02 | 太原理工大学 | A kind of compound slurry and preparation method thereof used under river channels |
| CN111072366A (en) * | 2019-12-30 | 2020-04-28 | 浙江斯力柯新材料科技有限公司 | Inorganic grouting material capable of stopping open water and reinforcing structure and preparation method and application thereof |
| CN111995339A (en) * | 2020-07-16 | 2020-11-27 | 天津大学前沿技术研究院有限公司 | Anti-scouring solidified soil for ocean platform and preparation method thereof |
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