CN106082903B - A kind of dredging silt composite curing agent - Google Patents

A kind of dredging silt composite curing agent Download PDF

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Publication number
CN106082903B
CN106082903B CN201610432520.9A CN201610432520A CN106082903B CN 106082903 B CN106082903 B CN 106082903B CN 201610432520 A CN201610432520 A CN 201610432520A CN 106082903 B CN106082903 B CN 106082903B
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China
Prior art keywords
curing agent
dredging silt
composite curing
flyash
cement
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Expired - Fee Related
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CN201610432520.9A
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CN106082903A (en
Inventor
王东星
邹维列
彭良泉
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Wuhan University WHU
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Wuhan University WHU
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/10Lime cements or magnesium oxide cements
    • C04B28/12Hydraulic lime

Abstract

The present invention provides a kind of dredging silt composite curing agent, is made up of cement, lime stone, metakaolin, flyash, magnesia, quick lime and sodium hydroxide.The present invention combines alkali-activated carbonatite principle, by adjusting itself component addition, the cheap materials such as trade waste flyash is made full use of, only containing the conventional curing agents such as a small amount of cement and lime.The present invention has the advantages that early epistasis energy is good, strength stability is good and water stability is good, can obviously improve the properties such as mud high-moisture percentage and low-intensity, and discarded dredging silt is converted into reproducible utilization earth working material, reaches preferable solidification effect and economic effect.

Description

A kind of dredging silt composite curing agent
Technical field
This technology invention belongs to construction material and building lot field, and in particular to one kind is used for marine facies, lake Hunan and river course Deng the composite curing agent for high-moisture percentage dredging silt consolidation process.
Background technology
During China harbour, lake and river bottom mud desilting, the substantial amounts of and High water cut containing pollutant can be produced Measure mud.1998 to 2003, China was to the important water such as the rivers such as the Changjiang river, the Yellow River, Haihe River and Huaihe River and Dongting Lake, Poyang Lake Domain is dredged, and dredging silt amount reaches 1.2 billion cubic meters.The annual ten thousand stere of dredging silt amount about 500 in PORT OF TIANJIN, Qinhuangdao Port penta the sixth of the twelve Earthly Branches harbour dredging silt amount has reached 269.3 ten thousand steres.1999 to 2000, one phase of Hangzhou West Lake dredging work was tired out Count the ten thousand stere of dredging silt amount more than 100.These mud moisture content are high, clay content is high, compressibility is strong, low intensity, stack not But take a large amount of soils, it is difficult to directly utilized by engineering.Therefore, dredging silt disposal of resources problem, it is China's economy high speed Developing period is difficult to the urgent problem to be solved avoided.
Conventional method of disposal, i.e. land are stacked or ocean is abandoned, by the inevitable land resource for taking worsening shortages And pollution of ecological environment.Therefore, increasing experts and scholars are intended to use solidification and stabilization processing method, i.e., into mud Curing materials are added, are effectively improved the engineering characteristics such as intensity, deformation and the permeability of mud, discarded dredging silt is converted into can Regeneration, low stain even free of contamination earth working material.Curing process post-modification mud can be used as fill material, applied to carrying The engineerings such as anti-reinforcing, road and sea reclamation, meet the theory of china natural resources regeneration and sustainable development.
The curing materials species that reuse of dredging utilizes is various, mainly includes:Cement, lime, slag, flyash and height gather The materials such as thing, these materials can effectively improve mud strength character, cost-effective, and reaching turns waste into wealth and mud regeneration Purpose.Because dredging silt possesses moisture content height, content of organic matter height, clay particle content height etc. different from the general soil body Feature, conventional curing material usual consolidation effect when handling dredging silt is not satisfactory, or curing agent volume is excessive causes to locate Manage high expensive.And above material mixture ratio species is single, it is impossible to utilizes the advantage of multiple material blending.Therefore, exploitation is adapted to In dredging silt characteristic, cost-effective composite curing material, to substitute or partly substitute the high energy consumption materials such as cement, lime Material, has certain engineering significance and realistic price.
The content of the invention
The purpose of the present invention aims to provide performance brilliance, a kind of dredging silt composite curing that cost is reasonable, environment-friendly Agent, effectively solve the problems such as high dredging silt moisture content, low intensity and water stability difference, make mud that there is good thing after reinforcing Manage mechanical property.
The dredging silt composite curing agent of the present invention, each component are by dry powder quality percentage composition:
Composition:Quality forms(%)
Cement 9-15
Magnesia: 8~15
Lime stone: 15~25
Metakaolin: 19~32
Quick lime: 6~12
Flyash: 16~25
Sodium hydroxide: 10~15.
A kind of improvement of dredging silt curing agent disclosed by the invention, the flyash is second class powered coal ash.
A kind of improvement of dredging silt curing agent disclosed by the invention, the cement is 32.5R cement.
A kind of improvement of dredging silt curing agent disclosed by the invention, the magnesia is extra light calcined magnesia, and MgO contains Amount >=90%.
A kind of improvement of dredging silt curing agent disclosed by the invention, the sodium hydroxide is dry powder sample, and its NaOH contains Amount >=99%.
The a kind of of dredging silt curing agent disclosed by the invention improves, CaO content >=90% in the quick lime.
The a kind of of dredging silt curing agent disclosed by the invention improves, Al in the flyash2O3+SiO2Content >=70% and CaO content < 10%.
It is a further object to provide dredging silt composite curing agent in natural soft soil foundation consolidation process engineering In application and dredging silt curing agent as river, river, lake, sea etc. dredging desilting caused by sludge solidification prepare earth working material Application.
The preparation method of dredging silt composite curing agent of the present invention is:According to each raw material proportioning of composite curing agent, difference The dry powder such as cement, quick lime, metakaolin, magnesia, lime stone, sodium hydroxide and flyash are weighed, powdery samples are uniform Mix, produce dredging silt composite curing agent.
Dredging silt composite curing agent disclosed by the invention, technical principle are:Cement meets water and hydration reaction occurs rapidly, Hydrated calcium silicate C-S-H and drated calcium aluminate C-A-H is generated, there is remarkable effect to improving early strength;It is rapid that lime meets water Generate Ca (OH)2And certain heat is released, and it can accelerate moisture evaporation while absorbing moisture, it is mainly de- from chemical reaction initial stage Water acts on;Extra light calcined magnesia and water reaction generation Mg (OH)2, it is possible to provide alkaline environment, and generating body product expands and caused crowded Close effect;Ca(OH)2With Mg (OH)2It can combine NaOH as hydrated product and excite flyash activity component jointly, induce volcanic ash React and generate the agglutinates such as hydrated calcium silicate C-S-H, later strength can be effectively improved;Flyash can also fill hole Gap, play micro- filling effect;NaOH can excite aluminosilicate composition in metakaolin, and aquation aluminium is generated through ground polymerization process Sodium metasilicate N-A-S-H colloids concurrently give birth to induration, can effectively improve strength character;Lime stone (main component CaCO3) can carry For part calcium ion, crystallization, precipitation, and filling pore occur under high alkalinity environment, serves increase intensity effect.Study table It is bright, appropriate lime stone is added in mud, mud improved strength is produced appreciable results.
Compared with prior art, the advantage of the invention is that:With reference to alkali-activated carbonatite principle, abundant recycling industrial waste Thing flyash, extra light calcined magnesia green material is introduced, by adjusting pH value, promoting aquation and hardening process and exciting aluminosilicate Salt mineral active component etc., to reach preferable solidification effect, improve curing materials environment friendly.The present invention has water stable The good, early strength of property and stable long-term strength and the advantages that make full use of layer compaction effect, available for sludge solidification and soft soil foundation Processing etc., mud can be used as Roadbed Soil and backfill soil etc. after cured processing.
Embodiment
The present invention is expanded on further below by embodiment.
Embodiment 1
Dredging silt curing agent is prepared first, and its component includes cement, quick lime, extra light calcined magnesia, metakaolin, powder Coal ash, lime stone and sodium hydroxide etc., wherein:Cement 9%;Quick lime 7%;Lime stone 25%;Flyash 16%;Extra light calcined magnesia 8%;Metakaolin 25%;Sodium hydroxide 10%.
Dredging silt curing agent is prepared according to this proportioning, 200kg curing agent is mixed in every cubic metre of mud, mud is initial Moisture content is set as 90%, after mud and curing agent uniform stirring, prepares diameter 50mm, height 100mm samples, standard curing 1 It is stripped after it, and continues maintenance to 7 days and 28 days, each age is using three parallel samples progress unconfined compressive strengths.Gu Change mud and can reach 0.617MPa in 7 days curing age mean intensities, curing age mean intensity can reach 0.826MPa within 28 days.
Embodiment 2
Dredging silt curing agent is prepared first, and its component includes cement, quick lime, extra light calcined magnesia, metakaolin, powder Coal ash, lime stone and sodium hydroxide etc., wherein:Cement 9%;Quick lime 7%;Lime stone 20%;Flyash 16%;Extra light calcined magnesia 8%;Metakaolin 30%;Sodium hydroxide 10%.
Dredging silt curing agent is prepared according to this proportioning, 200kg curing agent is mixed in every cubic metre of mud, mud is initial Moisture content is set as 90%, after mud and curing agent uniform stirring, prepares diameter 50mm, height 100mm samples, standard curing 1 It is stripped after it, and continues maintenance to 7 days and 28 days, each age is using three parallel samples progress unconfined compressive strengths.Gu Change mud and can reach 0.743MPa in 7 days curing age mean intensities, curing age mean intensity can reach 0.985MPa within 28 days.
Embodiment 3
Dredging silt curing agent is prepared first, and its component includes cement, quick lime, extra light calcined magnesia, metakaolin, powder Coal ash, lime stone and sodium hydroxide etc., wherein:Cement 15%;Quick lime 7%;Lime stone 17%;Flyash 13%;Oxide of high activity Magnesium 8%;Metakaolin 30%;Sodium hydroxide 10%.
Dredging silt curing agent is prepared according to this proportioning, 200kg curing agent is mixed in every cubic metre of mud, mud is initial Moisture content is set as 90%, after mud and curing agent uniform stirring, prepares diameter 50mm, height 100mm samples, standard curing 1 It is stripped after it, and continues maintenance to 7 days and 28 days, each age is using three parallel samples progress unconfined compressive strengths.Gu Change mud and can reach 0.834MPa in 7 days curing age mean intensities, curing age mean intensity can reach 1.176MPa within 28 days.
Embodiment 4
Dredging silt curing agent is prepared first, and its component includes cement, quick lime, extra light calcined magnesia, metakaolin, powder Coal ash, lime stone and sodium hydroxide etc., wherein:Cement 9%;Quick lime 7%;Lime stone 19%;Flyash 16%;Extra light calcined magnesia 14%;Metakaolin 25%;Sodium hydroxide 10%.
Dredging silt curing agent is prepared according to this proportioning, 200kg curing agent is mixed in every cubic metre of mud, mud is initial Moisture content is set as 90%, after mud and curing agent uniform stirring, prepares diameter 50mm, height 100mm samples, standard curing 1 It is stripped after it, and continues maintenance to 7 days and 28 days, each age is using three parallel samples progress unconfined compressive strengths.Gu Change mud and can reach 0.707MPa in 7 days curing age mean intensities, curing age mean intensity can reach 0.955MPa within 28 days.
Flyash is second class powered coal ash in above-described embodiment;Cement is 32.5R cement;Magnesia is extra light calcined magnesia, And content of MgO >=90%;Sodium hydroxide is dry powder sample, its NaOH content >=99%;CaO content >=90% in quick lime;Flyash Middle Al2O3+SiO2Content >=70% and CaO content < 10%.
The present invention combines alkali-activated carbonatite principle, by adjusting itself component addition, makes full use of trade waste flyash Deng cheap material, only containing the conventional curing agents such as a small amount of cement and lime.The present invention have early epistasis can good, strength stability it is good and The advantages that water stability is good, the properties such as mud high-moisture percentage and low-intensity are can obviously improve, discarded dredging silt is converted into can Regeneration earth working material, reach preferable solidification effect and economic effect.

Claims (9)

  1. A kind of 1. dredging silt composite curing agent, it is characterised in that:In terms of dry powder, include the component of following mass percent:Water Mud 9-15%, lime stone:15-25%, metakaolin:19-32%, flyash:16-25%, magnesia:8-15%, quick lime:6-12% And sodium hydroxide:10-15% is formed, and each component percentage sum is 100;The magnesia is extra light calcined magnesia, and MgO contains Amount >=90%.
  2. 2. dredging silt composite curing agent according to claim 1, it is characterised in that:The flyash is two level fine coal Ash.
  3. 3. dredging silt composite curing agent according to claim 1, it is characterised in that:The cement is 32.5R cement.
  4. 4. dredging silt composite curing agent according to claim 1, it is characterised in that:The sodium hydroxide is high-purity NaOH dry powder, its NaOH content >=99%.
  5. 5. dredging silt composite curing agent according to claim 1, it is characterised in that:CaO content in the quick lime >= 90%。
  6. 6. dredging silt composite curing agent according to claim 1, it is characterised in that:Al in the flyash2O3With SiO2 Mass percent sum >=70% and CaO mass percents < 10%.
  7. A kind of 7. preparation method of the dredging silt composite curing agent described in claim 1, it is characterised in that:According to proportioning, divide The dry powder of cement, quick lime, metakaolin, magnesia, lime stone, sodium hydroxide and flyash is also known as taken, powdery samples are equal Even mix, produce dredging silt composite curing agent.
  8. 8. any described dredging silt composite curing agents of claim 1-6 are as caused by river, river, lake, sea dredging desilting Sludge solidification prepares the application of earth working material.
  9. 9. application of any described dredging silt composite curing agents of claim 1-6 in reinforced soft soil ground.
CN201610432520.9A 2016-06-17 2016-06-17 A kind of dredging silt composite curing agent Expired - Fee Related CN106082903B (en)

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CN106892546B (en) * 2017-03-13 2020-05-08 江苏中宜生态土研究院有限公司 Composite pollution river and lake bottom mud stabilization treatment method
CN108516765A (en) * 2018-04-27 2018-09-11 福建建中建设科技股份有限公司 A kind of riverway sludge is non-burning brick and preparation method thereof
CN108691301B (en) * 2018-06-08 2020-09-29 堡森(上海)新材料科技有限公司 Dredged mud in-situ solidification-based ecological revetment and preparation method thereof
CN109264964A (en) * 2018-11-14 2019-01-25 环境保护部华南环境科学研究所 A kind for the treatment of process of environment-friendly type sludge solidification dredging
CN110218073A (en) * 2019-05-21 2019-09-10 武汉大学 Dredging silt dehydrating and curing calcium and magnesium based composites and the preparation method and application thereof
CN110526647B (en) * 2019-09-11 2022-02-18 上海海顾新材料科技有限公司 Bottom mud drying solidification agent and preparation method thereof
CN111187033B (en) * 2019-12-27 2021-03-19 中国地质大学(武汉) Alkali-activated gangue powder geopolymer cementing material and preparation method thereof
CN113387620B (en) * 2021-06-16 2022-12-16 河海大学 Solidified dredged sludge block based on alkali-activated cementing material and preparation method thereof
CN113912373B (en) * 2021-11-22 2022-06-10 纳思同(无锡)科技发展有限公司 High-performance curing agent for quickly curing soft soil with high water content into roadbed filler
CN115403230A (en) * 2022-08-26 2022-11-29 中建四局第三建设有限公司 Composite curing agent for curing silt soil and curing method
CN115710112B (en) * 2022-11-23 2023-08-22 中建商品混凝土有限公司 Composite curing agent for dredging sludge and preparation method and application thereof
CN117303842A (en) * 2023-08-15 2023-12-29 南京交通职业技术学院 Brick making formula, technology and application based on dredging sludge

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CN100522854C (en) * 2007-10-12 2009-08-05 河海大学 Solidifying agent for solidifying and stabilizing treatment of generated dewatered sludge in sewage plant
CN103086666B (en) * 2013-01-18 2014-10-08 河海大学 River sludge composite curing material with high organic matter content and application thereof
CN103387371B (en) * 2013-06-26 2015-02-04 湖北加德科技股份有限公司 Composite curing agent for city sludge solidification/stabilization and application thereof
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CN104108905B (en) * 2014-07-09 2016-01-20 浙江建设职业技术学院 A kind of early-strength type composite curing agent of high organic mudflat sludge and application thereof

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