CN114368928B - Exciting agent for dredging soil high-strength solidification and application thereof - Google Patents

Exciting agent for dredging soil high-strength solidification and application thereof Download PDF

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Publication number
CN114368928B
CN114368928B CN202210071727.3A CN202210071727A CN114368928B CN 114368928 B CN114368928 B CN 114368928B CN 202210071727 A CN202210071727 A CN 202210071727A CN 114368928 B CN114368928 B CN 114368928B
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dredged soil
exciting agent
curing
soil
urea
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CN114368928A (en
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刘晓强
恽亦凡
裴文斌
王欢
晋亚斐
杨立功
孟毅
李倩倩
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Tianjin Research Institute for Water Transport Engineering MOT
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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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/0436—Dredged harbour or river sludge
    • 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
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
    • C04B2111/00775—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes the composition being used as waste barriers or the like, e.g. compositions used for waste disposal purposes only, but not containing the waste itself
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

The invention provides an exciting agent for high-strength solidification of dredged soil and application thereof, wherein the exciting agent comprises the following components in parts by mass: 0.5-1.5 parts of sodium silicate, 0.2-1 part of ethyl acetate, 0.5-1 part of triethanolamine, 0.5-1 part of nano silicon powder, 0.5-1 part of urea-formaldehyde resin, 0.5-1.5 parts of calcium lignosulfonate and 0.5-1 part of potassium permanganate. The exciting agent disclosed by the invention can be used for rapidly curing the dredged soil by utilizing a physical and chemical combination method, effectively and rapidly reducing the water content of the dredged soil, improving the curing strength of the dredged soil, and greatly increasing the activity of a curing material through stirring, mixing and curing by adding the exciting agent disclosed by the invention into the dredged soil, further exciting the curing effect of the dredged soil, and improving the unconfined compressive strength of the dredged soil so as to achieve the engineering application condition.

Description

Exciting agent for dredging soil high-strength solidification and application thereof
Technical Field
The invention belongs to the field of building engineering materials, and particularly relates to an exciting agent for high-strength solidification of dredged soil and application thereof.
Background
The method has the advantages that a large amount of dredging spoil is generated in the course of channel renovation of water transport engineering, and not only occupies a large amount of land resources, but also possibly has adverse effects on surrounding environment, so that comprehensive utilization research of the dredging spoil in the water transport engineering is developed, the physical and mechanical properties and structural composition characteristics of the dredging spoil in a typical section of the channel engineering are mastered, an evaluation system of the structural performance of the dredging spoil is established, a reasonable mode of converting and utilizing the dredging spoil in the channel ecological engineering of Yangtze river is guided, and the method has important significance for reasonably guiding and utilizing the dredging spoil, promoting economic and social coordinated development and water ecological civilization construction. The dredged soil has high water content, high compression, low bearing capacity and low strength, and can not be directly used for engineering, the conventional method generally carries out curing treatment on the dredged soil, the mechanical property of the dredged soil is improved after the dredged soil is cured by using a curing agent, the curing effect of the dredged soil can be well improved after an exciting agent is further added, and the cured dredged soil can be applied to channel slope protection engineering, roads, storage yard filler engineering and the like.
The common exciting agent for curing dredged soil is mainly quicklime. And because the added quicklime makes the strength improvement amplitude smaller, an exciting agent formula for improving the strength more effectively is sought. The patent with application number 2018113448334 has the advantages that although calcium chloride and potassium permanganate excitation materials are added on the basis of the original curing agent, pollution is reduced, malodor is removed, and the effect of improving the strength is not particularly remarkable; the patent with application number 2019108587967 discloses a cement-based marine soft soil curing agent based on industrial waste and a composite activator, which comprises the following components in percentage by mass: 30-40% of Portland cement, 30-40% of undisturbed ash waste, 10-15% of gypsum, 8-15% of carbide slag waste, 1-3% of fiber, 5-15% of composite activator (3-7% of sodium silicate and 2-8% of calcium chloride), and the invention realizes the efficient on-site treatment and recycling of soft soil, but the unconfined compressive strength of a cured product is not high through detection.
Disclosure of Invention
In view of the above, the present invention aims to propose an exciting agent for high-strength curing of dredged soil and application thereof, so that the dredged soil can be quickly cured by using a physical combination chemical method, the water content of the dredged soil can be effectively and quickly reduced, and meanwhile, the strength of the dredged soil is improved by curing, so that the dredged soil can reach engineering application conditions.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the exciting agent for the high-strength solidification of the dredged soil comprises the following components in parts by mass:
0.5-1.5 parts of sodium silicate, 0.2-1 part of ethyl acetate, 0.5-1 part of triethanolamine, 0.5-1 part of nano silicon powder, 0.5-1 part of urea-formaldehyde resin, 0.5-1.5 parts of calcium lignosulfonate and 0.5-1 part of potassium permanganate. The using method of the exciting agent comprises the following steps:
mixing ash bodies, an exciting agent and dredged soil according to a mass ratio of 20:3:77, wherein the ash bodies comprise cement and slag powder, and the mass ratio of the cement to the slag powder is 44:56; preferably, the cement is silicate PO42.5 cement, and the slag powder is S95 grade slag powder.
The excitant is suitable for various earths, in the mucky soil, potassium permanganate in the excitant enables organic matters in clay to be cracked and decomposed to form small molecules or monomers, the structure of the potassium permanganate is changed to enable the small molecules or monomers to be condensed, and after the dealkane, side chain oxidation, alcoholization and the like of the potassium permanganate are performed, the cracking of organic matter macromolecules is realized;
in sandy soil, the strength of the sandy soil can be greatly improved by water glass and ethyl acetate, and calcium silicate or silica gel particles are generated when the water glass encounters high-valence metal ions in the soil or pore water with the pH value lower than 9, so that the pores among the soil particles are filled, and the soil body strength is improved. Besides generating precipitation filling, the water glass and the soil have chemical cementing effect among soil particles;
in the soil with higher pH value, the triethanolamine can effectively improve the early strength; the calcium lignosulfonate in the excitant is a natural polymer material, can be oxidized into free radicals under the action of potassium permanganate, introduces a new hydrophilic group, and simultaneously increases the molecular weight and the surface activity of the calcium lignosulfonate; then the urea-formaldehyde resin forms a network-shaped frame structure in the urea-formaldehyde resin on the basis of the increased molecular weight, so that the strength of the solidified soil is improved;
the cement in the mortar body and water can generate calcium silicate hydrate after hydration reaction, but the calcium silicate hydrate has the characteristic of insufficient close gelation combination, so that the nano silica powder in the excitant has further gelation, the curing mechanism of the nano silica powder cement soil is summarized into four aspects of setting and hardening of cement, pozzolan effect, ion exchange adsorption and filling effect, and the strength of the cement soil can be obviously improved by adding the nano silica powder into the cement soil.
Further, the molecular formula of the water glass is Na 2 O·nSiO 2 Wherein the modulus n is 3.6.
Further, the purity of the ethyl acetate is more than 99.7%, the water content is less than 0.05%, and the density is 0.9g/cm 3 。
Further, the purity of the triethanolamine is more than 99 percent, and the density is 1.122 to 1.127g/cm 3 。
Further, the purity of the nano silicon powder is more than 99 percent, and the specific surface area is 40m 2 /g。
Further, the urea-formaldehyde resin is prepared from formaldehyde and urea as raw materials, wherein the molar ratio of formaldehyde to urea is 1.5-2:1, and the molecular weight of the urea-formaldehyde resin is 10000 on average.
Further, the lignin content in the calcium lignosulfonate is 50% -65%, and the pH value is 4-6.
Further, the molecular weight of the potassium permanganate is 158.03.
The use of an activator as described above in the field of dredged soil curing.
Compared with the prior art, the exciting agent for dredging soil high-strength solidification and the application thereof have the following advantages:
the exciting agent disclosed by the invention can be used for rapidly curing the dredged soil by utilizing a physical and chemical combination method, effectively and rapidly reducing the water content of the dredged soil, improving the curing strength of the dredged soil, and greatly increasing the activity of a curing material through stirring, mixing and curing by adding the exciting agent disclosed by the invention into the dredged soil, further exciting the curing effect of the dredged soil, and improving the unconfined compressive strength of the dredged soil so as to achieve the engineering application condition.
Drawings
FIG. 1 is a graph showing the trend of the soil mechanical properties obtained by solidification of examples 1 to 5 of the present invention and comparative example.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention pertains. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to examples.
Example 1
The ash body comprises the following components in percentage by mass: 44wt% of PO42.5 ordinary Portland cement and 56wt% of slag powder. The exciting agent comprises the following components in parts by weight: na (Na) 2 O·nSiO 2 (sodium silicate) 0.5 part, ethyl acetate 0.5 part, triethanolamine 1.5 part, nano silicon powder 0.5 part, urea-formaldehyde resin 0.5 part, calcium lignosulfonate 0.8 part and potassium permanganate 0.5 part. The cement body prepared according to the proportion is mixed with 3 percent of exciting agent and 77 percent of dredged soil according to the proportion, and then the mixture is uniformly stirred, molded and cured, the mechanical properties of the soil body taken out from the mold are obviously changed after 7 days of curing, the unconfined compressive strength of the soil body reaches 17.6MPa, and the unconfined compressive strength of the soil body can reach 19.9MPa after 28 days of curing.
Example 2
The ash body comprises the following components in percentage by mass: 44wt% of PO42.5 ordinary Portland cement and 56wt% of slag powder. The exciting agent comprises the following components in parts by weight: na (Na) 2 O·nSiO 2 (sodium silicate) 0.8 part, ethyl acetate 0.6 part, triethanolamine 1.5 parts, nano silicon powder 0.6 part, urea-formaldehyde resin 0.8 part, calcium lignosulfonate 0.8 part and potassium permanganate 0.6 part. The cement body prepared according to the proportion is mixed with 3 percent of exciting agent and 77 percent of dredged soil according to the proportion, and then the mixture is uniformly stirred, molded and cured, the mechanical properties of the soil body taken out from the mold are obviously changed after 7 days of curing, the unconfined compressive strength of the soil body reaches 19.1MPa, and the unconfined compressive strength of the soil body can reach 21.7MPa after 28 days of curing.
Example 3
The ash body comprises the following components in percentage by mass: 44wt% of PO42.5 ordinary Portland cement and 56wt% of slag powder. The exciting agent comprises the following components in parts by weight: na (Na) 2 O·nSiO 2 (sodium silicate) 1 part, ethyl acetate 0.7 part, triethanolamine 1.5 parts, nano silicon powder 0.7 part, urea-formaldehyde resin 0.8 part, lignin1 part of calcium sulfonate and 0.8 part of potassium permanganate. The cement body prepared according to the proportion is mixed with 3 percent of exciting agent and 77 percent of dredged soil according to the proportion, and then the mixture is uniformly stirred, molded and cured, the mechanical properties of the soil body taken out from the mold are obviously changed after 7 days of curing, the unconfined compressive strength of the soil body reaches 24.6MPa, and the unconfined compressive strength of the soil body can reach 27.9MPa after 28 days of curing.
Example 4
The ash body comprises the following components in percentage by mass: 44wt% of PO42.5 ordinary Portland cement and 56wt% of slag powder. The exciting agent comprises the following components in parts by weight: na (Na) 2 O·nSiO 2 (sodium silicate) 1.2 parts, ethyl acetate 0.8 parts, triethanolamine 1.5 parts, nano silicon powder 0.8 parts, urea-formaldehyde resin 1 part, calcium lignosulfonate 1 part and potassium permanganate 0.8 part. The cement body prepared according to the proportion is mixed with 3 percent of exciting agent and 77 percent of dredged soil according to the proportion, and then the mixture is uniformly stirred, molded and cured, the mechanical properties of the soil body taken out from the mold are obviously changed after 7 days of curing, the unconfined compressive strength of the soil body reaches 25.9MPa, and the unconfined compressive strength of the soil body can reach 28.1MPa after 28 days of curing.
Example 5
The ash body comprises the following components in percentage by mass: 44wt% of PO42.5 ordinary Portland cement and 56wt% of slag powder. The exciting agent comprises the following components in parts by weight: na (Na) 2 O·nSiO 2 1.5 parts of (water glass), 1 part of ethyl acetate, 1.5 parts of triethanolamine, 1 part of nano silicon powder, 1 part of urea-formaldehyde resin, 1.5 parts of calcium lignosulfonate and 1 part of potassium permanganate. The cement body prepared according to the proportion is mixed with 3 percent of exciting agent and 77 percent of dredged soil according to the proportion, and then the mixture is uniformly stirred, molded and cured, the mechanical property of the soil body taken out from the mold is obviously changed after 7 days of curing, the unconfined compressive strength of the soil body reaches 26.6MPa, and the unconfined compressive strength of the soil body can reach 29.3MPa after 28 days of curing.
Comparative example
The ash body comprises the following components in percentage by mass: 44wt% of PO42.5 ordinary Portland cement and 56wt% of slag powder. The exciting agent is common exciting agent NaOH, the ash body is prepared by the proportion of 20 percent, 3 percent of exciting agent and 77 percent of dredged soil are mixed, evenly stirred, molded and cured, the mechanical property of the soil body taken out from the mold is obviously changed after 7 days of curing, the unconfined compressive strength of the soil body reaches 15.2MPa, and the unconfined compressive strength of the soil body can reach 17.4MPa after 28 days of curing.
The change trend of the mechanical properties of the soil body obtained by curing in examples 1-5 and comparative example is shown in figure 1, and the exciting agent in the invention is obviously superior to the exciting agent in the prior art in dredging soil curing efficiency and curing effect through detection, so that the unconfined compressive strength is further improved, and the exciting agent has good social benefit and application prospect.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (11)

1. The exciting agent for the high-strength solidification of the dredged soil is characterized by comprising the following components in parts by weight:
0.5-1.5 parts of sodium silicate, 0.2-1 part of ethyl acetate, 0.5-1 part of triethanolamine, 0.5-1 part of nano silicon powder, 0.5-1 part of urea-formaldehyde resin, 0.5-1.5 parts of calcium lignosulfonate and 0.5-1 part of potassium permanganate.
2. The activator according to claim 1, characterized in that: the water glass modulus is 3.6.
3. The activator according to claim 1, characterized in that: the purity of the ethyl acetate is more than 99.7%, the water content is less than 0.05%, and the density is 0.9g/cm 3 。
4. The activator according to claim 1, characterized in that: the purity of the triethanolamine is more than 99 percent, and the density is 1.122-1.127g/cm 3 。
5. The activator according to claim 1, characterized in that: the purity of the nano silicon powder is more than 99 percent, and the specific surface area is 40m 2 /g。
6. The activator according to claim 1, characterized in that: the urea-formaldehyde resin is prepared from formaldehyde and urea as raw materials, wherein the molar ratio of formaldehyde to urea is 1.5-2:1, and the molecular weight of the urea-formaldehyde resin is 10000 on average.
7. The activator according to claim 1, characterized in that: the lignin content in the calcium lignosulfonate is 50% -65%, and the pH value is 4-6.
8. The activator according to claim 1, characterized in that: the molecular weight of the potassium permanganate is 158.03.
9. The activator according to claim 1, characterized in that the method of use of the activator comprises the steps of:
mixing ash bodies, an exciting agent and dredged soil according to a mass ratio of 20:3:77, wherein the ash bodies comprise cement and slag powder, and the mass ratio of the cement to the slag powder is 44:56.
10. The activator of claim 9, characterized in that the cement is portland cement No. 42.5 and the slag powder is S95 grade slag powder.
11. Use of an activator according to any one of claims 1-10 in the field of dredged soil curing.
CN202210071727.3A 2022-01-21 2022-01-21 Exciting agent for dredging soil high-strength solidification and application thereof Active CN114368928B (en)

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CN101735820B (en) * 2009-12-18 2012-07-25 李振华 Sand fixing material
CN102976677A (en) * 2012-11-30 2013-03-20 中交四航工程研究院有限公司 Dredged soil composite curing agent and engineering building material
CN106673569B (en) * 2016-12-16 2019-03-08 南京工业大学 A kind of high organic content dredging silt composite curing material
CN106915936A (en) * 2017-02-24 2017-07-04 浙江省交通规划设计研究院 A kind of muck soil composite curing agent and application
CN110563424A (en) * 2019-09-11 2019-12-13 上海交通大学 Cement-based marine soft soil curing agent based on industrial waste and composite excitant

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