CN114538855B - Underwater anti-scouring environment-friendly composite material, preparation method and construction process - Google Patents

Underwater anti-scouring environment-friendly composite material, preparation method and construction process Download PDF

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CN114538855B
CN114538855B CN202210265570.8A CN202210265570A CN114538855B CN 114538855 B CN114538855 B CN 114538855B CN 202210265570 A CN202210265570 A CN 202210265570A CN 114538855 B CN114538855 B CN 114538855B
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composite material
scouring
sludge
underwater
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CN114538855A (en
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管友海
徐瑞
刘欣
樊长琦
曲爽
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China University of Petroleum East China
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/10—Deep foundations
    • E02D27/12—Pile foundations
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017—Aspects relating to the protection of the environment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/24—Sea water resistance
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/74—Underwater applications
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Paleontology (AREA)
  • Mining & Mineral Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

The invention discloses an underwater anti-scouring environment-friendly composite material, a preparation method and a construction process, and relates to the technical field of underwater pile foundations. The composite material comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 70-80% of inorganic gel component; 0.5 to 1 percent of organogel component; 5 to 10 percent of anti-dispersant component; 2 to 4 percent of nano filling component; 7-10% of fly ash; the component B is marine sludge. The composite material makes full use of the waste high-water-content sludge, ensures the scouring and strength indexes, achieves the purpose of environmental protection, and solves the problem that the underwater platform foundation is scoured and corroded by wave current.

Description

Underwater anti-scouring environment-friendly composite material, preparation method and construction process
Technical Field
The invention relates to the technical field of underwater pile foundations, in particular to an underwater anti-scouring environment-friendly composite material, a preparation method and a construction process.
Background
China has a long coastline and rich seabed sludge resources, and meanwhile, piles of sludge are accumulated in water areas of various wharfs and navigation channels along the coast; at present, governments adopt a plurality of silt reducing measures to suck out a large amount of silt from the seabed, and the large amount of seabed silt which is extracted by a dredger is transported to deep ocean areas to be dumped or accumulated on the coast to form mudflats, so that the potential application value of the seabed silt is wasted; therefore, how to reasonably and fully utilize the seabed sludge is an important problem.
Under the vigorous support of the state, new energy industries such as offshore photovoltaic power generation, offshore wind turbines and the like are rapidly developed. However, after the offshore wind power is built, the pile foundation changes the original hydrodynamic condition of the area, so that the pile foundation is subjected to a strong scouring action, and finally a scouring pit is formed around the pile foundation, so that the stability of the pile foundation is influenced, and necessary anti-scouring protection measures need to be taken.
At present, the main anti-scouring protection forms comprise physical protection methods such as stone throwing, sand throwing bags, sand quilt bags, bionic aquatic plants and the like, but the anti-scouring effects of the methods are not ideal from the perspective of scouring results.
Disclosure of Invention
In view of the above, the invention provides an underwater anti-scouring environment-friendly composite material, a preparation method and a construction process, which make full use of high-water-content silt in the sea, ensure scouring and strength indexes, achieve the aim of environmental protection, and solve the problem that the foundation of an underwater platform is subjected to wave current scouring corrosion.
In order to achieve the above object, the present invention provides the following technical solutions:
an underwater anti-scouring composite material comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight:
50-60 parts of inorganic gel component;
0.5-1 part of organogel component;
30-40 parts of an anti-dispersant component;
2-4 parts of a nano filling component;
7-10 parts of coal ash;
the component B is ocean high-water-content sludge.
The invention also has the following additional technical features:
preferably, the inorganic gelling component is ordinary portland cement, in particular P.0 42.5.5 ordinary portland cement.
Preferably, the organogel component is an epoxy resin, in particular a polyvinyl alcohol-glycine polycondensate epoxy resin.
Epoxy resin is a very common coating material and is used in a wide range of applications, and its durability and protective properties make it suitable for many different applications.
Preferably, the anti-dispersant component is silica fume.
Preferably, the nano-fillingThe components are nano SiO 2 And the specific surface area is more than or equal to 25000 square meters per kilogram.
Preferably, the technical requirement of the fly ash is not lower than grade II, and the specific surface area is more than or equal to 400m 2 /kg。
Preferably, the weight ratio of the component A to the component B is 9-15: 100.
the invention also provides a preparation method of the underwater anti-scouring composite material, which comprises the following steps: and (3) putting the component A and the component B into a forced stirring kettle together, and fully stirring for 240-480 s for mixing to obtain the anti-scouring composite material.
The composite material of the invention generates a large amount of gel substances and crystalline substances through a series of hydrolysis and hydration reactions, wherein the gel substances can bond and wrap soil particles in the sludge, and the crystalline substances can fill gaps among the particles. The epoxy resin has the advantages of convenient curing, strong adhesive force, low contractility, stable chemical property, simple process, no need of applying overhigh pressure, good insulativity, chemical corrosion resistance, and better oil resistance and solvent resistance. The unconfined compressive strength of the prepared composite material 28d can reach about 500kPa, the cohesive force C value can reach 102kPa, and the composite material has good scour resistance and can resist the maximum water flow scouring of 4m/s of a solidified soil scouring test device in a laboratory under the unidirectional condition. The method can be used for reinforcing the foundation of the underwater platform to play a role in preventing scouring, can also be used for sea reclamation of ports, and is wide in application range, green and pollution-free.
In addition, the invention also provides a construction process of the underwater anti-scouring composite material, which comprises the following steps:
(1) Construction investigation: the construction ship arrives at a construction site and scans and detects related areas;
(2) Taking the silt in situ: excavating sludge according to construction requirements, controlling the depth of pits around a pile foundation, and analyzing the moisture content, organic matter components and the like of the sludge;
specifically, the water content of the sludge is 80-100%, and the organic matter content is less than 3%.
(3) Preparation of the composite in situ: mixing the dug sludge and the component A on a ship after stirring, wherein the mixing is according to the preparation method;
(4) And (3) blowing and filling the composite material: directly pumping the prepared solidified soil to a construction site by using a pipeline pump with high fluidity, and curing the soil in seawater;
(5) And (3) later-stage quality detection: and scanning and maintaining the formed sludge cured composite material underwater, and periodically checking the scouring condition of the composite material.
Preferably, the composite construction process can be considered in two practical engineering situations:
(1) The circumstance that the periphery of the pile foundation is not reinforced and a scouring pit is formed:
for the condition that the periphery of the pile foundation is not reinforced and a scouring pit is formed, filling a layer of common anti-dispersion sludge solidified soil into the scouring pit, then blowing and filling the anti-scouring composite material on the basis of the layer, and pouring the composite material into the scouring pit in layers, so that the secondary scouring of the foundation at the scouring pit can be prevented;
(2) The newly-built underwater pile foundation does not form the condition of scouring pit:
for a newly-built underwater pile foundation, on the basis of not influencing the bearing capacity of the newly-built underwater pile foundation, a pit with a certain depth is dug at the periphery of the newly-built underwater pile foundation, a layer of common anti-dispersion sludge solidified soil is filled in a scouring pit, then the anti-scouring sludge composite material is filled in the scouring pit by blowing on the basis of the layer, the slope after the composite material is poured and self-leveled is small, and scouring starting of the composite material on the surface layer around the pile foundation is difficult to cause.
Specifically, the common anti-dispersion sludge solidified soil is taken from sludge in deep sea.
The concrete construction method of the composite material construction process under the first working condition is characterized in that a construction ship digs surrounding high-water-content sludge near a pile foundation construction position, the sludge is divided into two groups which are respectively stirred to form two groups of cured composite materials with different strengths, one group is anti-dispersion sludge cured soil with lower strength poured at the bottom layer than the upper layer, and the other group is sludge cured composite materials with strength close to 500kpa, high anti-dispersion property and high fluidity poured at the upper layer, after the sludge cured composite materials are maintained underwater for a certain period of time (the strength is basically stable for 14-28 days) and the pile foundation is integrally formed, the anti-scouring indexes such as unconfined compressive strength, density and the like of the soil around the pile foundation can be effectively improved, so that a scouring pit caused by the occurrence of cracks around the pile foundation is avoided, and buildings such as an offshore wind turbine and the like can be operated for a long time.
The concrete construction method of the composite material construction process under the second working condition is characterized in that after a newly-built pile foundation is dug to a certain depth, a layer of common anti-dispersion sludge solidified soil is filled in a scouring pit, and then the anti-scouring sludge composite material formed by stirring the anti-scouring sludge solidified soil and the composite material is filled in a blowing manner on the basis of the layer.
The construction process has the outstanding characteristic that the sludge curing composite materials with different strengths and anti-scouring performances are poured in two layers, so that the high construction cost caused by pouring the same sludge curing composite material is reduced.
The technical principle of the invention is as follows: the inorganic gel component hydration products are mainly C-S (A) -H gel, and basic gel bonding effect is provided among silt clay particles, so that a dispersion system becomes an integral with higher mechanical strength.
The nano filling material can fill micro-pores formed in the sludge curing process, particularly micro-defects of sludge viscous particles and a C-S-H gel interface working area, strengthen the interface working area and improve the strength of the composite material.
The organic gel component mainly makes up the defect of weak early-stage gelling effect of the inorganic gel component and improves the early-stage strength of the composite material.
The anti-dispersant component is mainly water-soluble high molecular polymer, and reacts with the material to improve the bonding property of the sludge composite material mixture, so that the anti-scouring purpose is achieved.
Compared with the prior art, the invention has the advantages that:
strong anti-scouring capability: the composite material has excellent impermeability, is difficult to cause pore cracks by scouring, has high cohesiveness and strong scouring resistance (can resist water flow scouring with the flow velocity of more than 4 m/s), and can prevent the secondary scouring of the edge position of a pile foundation which is put into production and is not subjected to reinforcement treatment.
The construction is convenient, efficient: by utilizing the higher fluidity of the composite material and adopting the process of directly pumping the pipeline after the stirring on the ship, the composite material can be directly pumped into the scouring pit, and the scouring range is comprehensively covered.
Good water stability and durability: the composite material has strong underwater anti-dispersion property, can not be dispersed by water flow when being pumped underwater, can be well attached to a pile foundation in construction, solves the problem of difficulty in protecting the foundation of a wind power pile and repairing the foundation in the later period, greatly reduces the maintenance cost in the later period of offshore engineering, and has obvious advantage on the service life of the pile foundation.
The environmental protection value is high: the composite material is prepared from waste sludge, organic materials, degradable epoxy resin and other materials, meets the requirements of national environmental protection, reduces the consumption of non-renewable resources required by pile foundation protection, and greatly responds to the call of national policy of environmental protection and ecological civilization construction.
Market competitive advantage: at present, inorganic building materials such as cement are high in cost, cost in preparation and transportation processes is not negligible, waste sludge is large in resource amount but low in utilization rate in China, cost is extremely low, and compared with other physical protection such as riprap and the like, the composite material is more economical and long in service life, and has certain market competitiveness.
The cost is low: the construction process of the invention pours low-cost sludge solidified soil and composite material in the washout pit in two layers respectively, and compared with the whole pouring of composite material, the price is lower.
The composite material for improving the sludge provided by the invention has the advantages of small mixing amount, high strength index, excellent anti-scouring effect, strong environmental protection property and the like, and the prepared composite material has the unconfined compressive strength of about 500KPa, the cohesive force C value of over 100kPa and good dispersibility resistance. The invention provides a construction process of a composite material, which is characterized in that a layer of common anti-dispersion sludge solidified soil is filled in a scouring pit, and then an anti-scouring sludge composite material formed by stirring the composite material is filled in the scouring pit in a blowing mode on the basis of the layer, namely, the sludge solidified soil is poured in the scouring pit in a layered mode, meanwhile, the organic polymer material epoxy resin is added into the composite material, waste sludge with high water content is fully utilized, scouring and strength indexes are guaranteed, the purpose of environmental protection is achieved, and the problem that the foundation of an underwater platform is subjected to wave flow scouring corrosion is solved.
Detailed Description
Some embodiments of the invention are disclosed below, and those skilled in the art can appropriately modify the process parameters to achieve the invention according to the disclosure herein. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
Implementation materials:
the ordinary Portland cement is purchased from Yang Chun Cement Co., ltd, and the model is 42.5 ordinary Portland cement;
the epoxy resin is purchased from Tianjin Huachang resource industry trade Co., ltd, and the model is B18HX;
the silica fume is purchased from New Material science and technology company, henan, and has the model of WGF-6018;
nanoscale SiO 2 Purchased from new materials science and technology Limited, bangru, model VK-SP20S;
the fly ash is purchased from Rong Changcheng environment-friendly material with the model of RCS-FMH;
the sludge is taken from high-water-content sludge on the sea bed plane of deep sea in Fujian coastal areas.
Example 1
The component A in the embodiment comprises the following raw materials in parts by weight: cement: 53 parts of a mixture; epoxy resin: 0.69 part; silica fume: 32 parts of a binder; nanoscale SiO 2 :4 parts of a mixture; fly ash: 9 parts of. The prepared component A is used for consolidation of the seabed sludge, the water content of the sludge is 90%, 120g of the component A is doped into each kilogram of the sludge and is uniformly stirred, the performance indexes of the prepared composite material are shown in a table 2, and the physical properties of the in-situ seabed sludge are shown in a table 1.
TABLE 1 in situ seafloor sludge physical Properties
Index (I) Water content% Density/g/cm 3 Organic matter content/%) Liquid limit/%) Plastic limit/%)
Results 90 1.53 1.09 53.1 26.8
The 3h fluidity detection method comprises the following steps: coating vaseline on the inner wall of an organic glass cylinder, placing the organic glass cylinder in the center of a transparent glass plate, uniformly stirring solidified soil added with a composite material for 3 hours, pouring the mixture into the organic glass cylinder until the solidified soil at the end opening is flush, vertically lifting the hollow cylinder upwards to collapse the solidified soil on the transparent glass plate, and measuring the diameter of the solidified soil by using a ruler after the flow is finished.
The cohesive force C detection method comprises the following steps: and measuring the shear strength of the ring cutter sample by using a direct shear apparatus, drawing a shear strength straight line, and setting the intercept between the straight line and the y axis as cohesive force C.
The 28d compressive strength detection method comprises the following steps: and pouring the stirred composite material solidified soil into a customized glass cylinder for curing for 28 days, and directly testing the sample by placing the sample on an unconfined compression resistance instrument platform.
The composite material flow loss detection method comprises the following steps: a container with the volume of 1500mL is placed at the bottom of the barrel, and water is filled in the barrel to the height of 500mm. Mixing 2kg of composite material solidified soil, freely falling from the water surface, pouring into a container in water, making the soil completely enter the container under water without spilling, and standing for 5min. The container was lifted from the water, and the water accumulated on the solidified soil was drained off and weighed.
The method for detecting the content of the suspended matters comprises the following steps: 800mL of water was added to a 1000mL beaker, then 500g of solidified soil was divided into 10 equal portions, each of the solidified soil was slowly and freely dropped from the water surface by a hand shovel, the operation was completed within 10s to 20s, and the beaker was left to stand for 3min. The test was carried out quickly by gently sucking 600mL of water in the beaker with a pipette within 1min, taking care not to suck solidified soil from the watering person, and using the sucked water as a test sample.
Table 2 shows the performance indexes of the cured soil of the composite material
Figure BDA0003552437810000061
Example 2
The component A in the embodiment comprises the following raw materials in parts by weight: cement: 53 parts of a mixture; epoxy resin: 0 part of (C); silica fume: 35 parts of (B); nanoscale SiO 2 :4 parts of a mixture; fly ash: 9 parts. The prepared component A is used for consolidation of seabed sludge, the water content of the sludge is 90%, 120g of the component A is doped into each kilogram of sludge, the mixture is uniformly stirred, and the performance indexes of the prepared composite material are shown in table 2.
Table 3 Properties of the cured soil for the composite Material
Figure BDA0003552437810000062
Example 3
The component A in the embodiment comprises the following raw materials in parts by weight: cement: 53 parts of a mixture; epoxy resin: 0.69 part; silica fume: 35 parts of (B); nanoscale SiO 2 :4 parts of a mixture; fly ash: 9 parts of. The prepared component A is used for the consolidation of seabed sludge, and the sludge containsThe water rate is 90%, 120g of the component A is doped into each kilogram of sludge, the mixture is uniformly stirred, and the performance indexes of the prepared composite material are shown in table 3.
Table 4 shows the performance indexes of the cured soil of the composite material
Figure BDA0003552437810000063
Example 1 compared with example 3, after the addition amount of the anti-dispersant silica fume is reduced, the dispersion resistance index loss and turbidity of the composite material solidified soil are relatively reduced, and other anti-scouring indexes are lower than those of example 3; example 2 comparing with example 3, the content of the organic gel group epoxy resin is reduced, the cohesive force and the unconfined compressive strength are obviously reduced, and the index of the anti-dispersion is also reduced compared with example 3; example 3 with the addition of epoxy resin, the loss of the composite material and the content of suspended solids are both reduced, also demonstrating the better dispersion resistance of the present invention.
Example 4 Effect of the composite on the scour strength in seawater
The component A in the embodiment comprises the following raw materials in parts by weight: cement: 56 parts of; epoxy resin: 0.8 part; silica fume: 32 parts of (1); nanoscale SiO 2 :1 part; fly ash: 7 parts. The prepared component A is used for consolidation of seabed sludge, the water content of the sludge is 90%, and 120g of the component A is mixed into each kilogram of sludge and is uniformly stirred.
Example 5 Effect of the composite on the scour strength in seawater
The component A in the embodiment comprises the following raw materials in parts by weight: cement: 58 parts of a mixture; epoxy resin: 0.5 part; silica fume: 36 parts of (A); nanoscale SiO 2 :3 parts of a mixture; fly ash: and 7 parts. The prepared component A is used for consolidation of seabed sludge, the water content of the sludge is 90%, and 120g of the component A is mixed into each kilogram of sludge and is uniformly stirred.
Example 6 Effect of the composite on the scour strength in seawater
The component A in the embodiment comprises the following raw materials in parts by weight: cement: 53 parts of a mixture; epoxy resin: 0.69 part; silica fume: 36 parts of (a); nanoscale SiO 2 :4 parts of a mixture; fly ash: 9 parts. The prepared component A is used for consolidation of seabed sludge, the water content of the sludge is 90%, and 120g of the component A is mixed into each kilogram of sludge and is uniformly stirred.
Example 7 scouring Strength Effect of composite materials in seawater example
The component A in the embodiment comprises the following raw materials in parts by weight: cement: 51 parts of a mixture; epoxy resin: 0.7 part; silica fume: 39 parts of a mixture; nanoscale SiO 2 :2 parts of (1); fly ash: 9 parts. The prepared component A is used for consolidation of seabed sludge, the water content of the sludge is 90%, and 120g of the component A is mixed into each kilogram of sludge and is uniformly stirred.
TABLE 5 comparison of anti-scour indicators
Figure BDA0003552437810000071
The scouring test is carried out in a laboratory through a reduced scale model, the composite material solidified soil is poured into a scouring test box through a pipeline, one end of a box opening is connected with a water inlet of a water pump, the other end of the box opening is connected with a reservoir, and the joint of the water inlet and the pipeline adopts a fan-shaped design, so that the composite material solidified soil is comprehensively scoured when water flow scours. The water pump is used for controlling the water flow speed, and when the water flow speed exceeds 3.8m/s, the shear stress of the surface of the solidified soil in the embodiment 4 is greater than the starting shear stress, so that the surface of the solidified soil starts to generate slight silt starting; when the water flow rate exceeds 3.7m/s, the shear stress of the surface of the solidified soil in example 5 is greater than the start shear stress, so that the surface of the solidified soil starts to have slight silt start; when the flow velocity of water flow reaches about 4.1m/s, the shear stress of the surface of the solidified soil in the embodiment 6 is greater than the start shear stress, so that the surface of the solidified soil starts to have slight silt start; when the water flow rate exceeded 3.8m/s, the shear stress of the cured soil surface of example 7 was greater than the onset shear stress, causing the cured soil surface to begin to exhibit a slight silt onset. Tests show that the invention has the capability of resisting water flow scouring of about 4m/s without a great deal of soil loss and has better anti-scouring performance.
The invention utilizes the organic gel group epoxy resin to have good promotion function on the sludge solidification and scour resistance, simultaneously the anti-dispersion index meets the DLT 5117-2000 underwater undispersed concrete test procedure, the seawater at the construction part is extracted on site and stirred to meet the engineering requirement, the construction cost can be greatly reduced by pouring the sludge solidification composite material by layer construction, and the seabed sludge is utilized, thereby having economic and environment-friendly practical engineering application value.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (4)

1. An underwater antiscour composite material is characterized by comprising a component A and a component B;
the component A comprises the following raw materials in parts by weight: 50 to 60 parts of inorganic gel component; 0.5 to 1 part of organic gel component; 30-40 parts of an anti-dispersant component; 5363 parts of nano filling component 2~4; 7-10 parts of coal ash;
the component B is marine high-water-content sludge; the inorganic gelling component is ordinary portland cement; the organic gel component is polyvinyl alcohol-glycine polycondensate epoxy resin; the anti-dispersant component is silica fume; the nano filling component is nano SiO 2 The specific surface area is more than or equal to 25000 square meters per kilogram; the technical requirement of the fly ash is not lower than II grade, and the specific surface area is more than or equal to 400m 2 Per kg; the weight ratio of the component A to the component B is 9 to 15:100.
2. a preparation method of an underwater anti-scouring composite material comprises the following steps: the method is characterized in that the component A and the component B in the claim 1 are put into a compulsory stirring kettle together, and are fully stirred for 240s to 480s to be mixed, so that the anti-scouring composite material is prepared.
3. The construction process of the underwater anti-scouring composite material is characterized by comprising the following steps of:
(1) Construction investigation: the construction ship arrives at a construction site and scans and detects related areas;
(2) Taking the silt in situ: excavating sludge according to construction requirements, controlling the depth of pits around a pile foundation, and analyzing the water content and organic matter components of the sludge;
(3) Preparation of the composite in situ: mixing the dredged sludge with the component A according to claim 1 on a ship after stirring, the mixing being a preparation method according to claim 2;
(4) And (3) blowing and filling the composite material: directly pumping the prepared solidified soil to a construction site by using a pipeline pump with high fluidity, and curing the soil in seawater;
(5) And (3) later-stage quality detection: and scanning and curing the formed sludge cured composite material underwater, and periodically checking the scouring condition of the composite material.
4. The process for the construction of underwater scour resistant composite materials of claim 3, wherein the composite construction process can be considered in two practical engineering situations:
(1) The circumstance that the periphery of the pile foundation is not reinforced and a scouring pit is formed:
for the condition that the periphery of a pile foundation is not reinforced and a scour pit is formed, firstly filling a layer of common anti-dispersion sludge solidified soil into the scour pit, then blowing and filling the anti-scour composite material according to claim 1 on the basis of the layer, and pouring the composite material into the scour pit in a layered mode, so that secondary scouring of the foundation at the scour pit can be prevented;
(2) The newly-built underwater pile foundation does not form the condition of scouring pit:
for newly-built underwater pile foundations, on the basis of not influencing the bearing capacity of the newly-built underwater pile foundations, deep pits are dug around the newly-built underwater pile foundations, a layer of common anti-dispersion silt solidified soil is filled into the pits, and then the anti-scouring composite material in the claim 1 is filled on the basis of the layer by blowing.
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