CN108558252A - A kind of curing agent and its application for reinforcing high organic weak soil - Google Patents
A kind of curing agent and its application for reinforcing high organic weak soil Download PDFInfo
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- CN108558252A CN108558252A CN201711442101.4A CN201711442101A CN108558252A CN 108558252 A CN108558252 A CN 108558252A CN 201711442101 A CN201711442101 A CN 201711442101A CN 108558252 A CN108558252 A CN 108558252A
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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
- C04B11/00—Calcium sulfate cements
- C04B11/28—Mixtures thereof with other inorganic cementitious materials
- C04B11/30—Mixtures thereof with other inorganic cementitious materials with hydraulic cements, e.g. 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
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- 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
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Sciences (AREA)
- Inorganic Chemistry (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a kind of curing agent and its applications for reinforcing high organic weak soil.The curing agent includes following component as mass fraction：Portland cement 40 70%, ardealite 25 35%, high alumina cement 5 25%, and CaO/Al in the curing agent component2O3Mass values are between 24, SO3/Al2O3Mass values are between 0.8 1.5.Curing agent and live soil in-situ are stirred according to sitework geological conditions using construction method in situ, form pile body, realize the curing process of high organic weak soil by application of the above-mentioned curing agent in organic matter soft soil solidification；The original position construction method is divided into following steps：Determine pile position；The prepared curing agent is sprayed into the soil body using deep mixer, and by stirring blade that the curing agent and soil shear failure is uniform, until design treatment depth.The effect of curing agent solidification high organic soil of the present invention is good, of low cost.
Description
Technical field
The invention belongs to technical field of civil engineering, and in particular to it is a kind of for reinforce high organic weak soil curing agent and
It is applied.
Background technology
Distribution of the organic soil in China is relatively broad, and the organic matter on ordinary meaning includes humus and polysaccharide two
Class, the humus can be divided into humic acid (humic acid), fulvic acid and humin three classes according to its dissolubility.Organic matter is deposited
The hydration reaction of cement can often hindered, on the one hand, organic matter, which is attached to cement particle surface, causes cement that cannot be normally carried out
Hydration reaction；On the other hand, for organic matter generally in acidity, it can decompose the product of hydrated cementitious so that the aquation of cement is produced
Object can not be generated normally, wherein it is Humic acids and fulvic acids to influence the most important organic matter of hydrated product.
Humic acid has strong attraction to calcium, when cement is combined to form humic acid calcium not soluble in water with organic matter,
The hydration of cement always.Fulvic acid promotes ferro-aluminum silicate mineral to decompose, and is easy to generate complex compound with aluminium, and then destroys
The formation of cement soil structure, and the adsorption layer of the suction-operated of itself and cement formation has delayed the process of hydrated cementitious, so that it is comprehensive
Group photo rings soil cement intensity.
Cement mixing method is widely used in processing soft soil, but the origin cause of formation of weak soil is different, and component is different, leads to water
Soil mixing pile is difficult to achieve the desired results in high organic soil.Therefore, the engineering problem of reinforcing organic matter soil should cause foot
Enough attention reduce the factor for influencing soil cement intensity.
Currently, people often generate a large amount of hydrated product or pozzolanic reaction product by the way that outer-penetrating agent is added, to improve list
Mix the effect of Portland cement solidification organic soil.Common outer-penetrating agent includes flyash, ardealite, granulated blast-furnace slag
Equal trade wastes.
The molecular formula of entringite is 3CaAl2O3·3CaSO4·32H2O is a kind of acicular crystal of hexagonal section,
With dilatancy.High organic soil is the association of a discrete particles, has larger hole, using the dilatancy of entringite,
Can effectively fill part soil body hole, reduce the void content of solidified earth, reduce solidification soil pores aperture, and then improve cement
Cure the intensity of organic soil.
The leading ion for forming entringite has AlO2-、Ca2+、SO4 2-, entringite formed chemical reaction it is as follows：
AlO2 -+2OH-+2H2O=[Al (OH)6]3-
2[Al(OH)6]3-+6Ca2++24H2O={ Ca6[Al(OH)6]2·24H2O}6+
{Ca6[Al(OH)6]2·24H2O}6++3SO4 2-+2H2O={ Ca6[Al(OH)6]2·24H2O}[3SO4 2—2H2O]
The formation speed of entringite depends on AlO2 -Concentration；Ca2+Concentration is the principal element for influencing entringite and being formed, and can shadow
Ring the generation form of entringite；SO4 2-Though influencing less, to prevent due to sulfur content deficiency to list on entringite synthesis speed
Sulfur type hydrated calcium aluminate sulfate converts, and is the existing condition steady in a long-term for maintaining entringite.
By-product when ardealite is phosphorus industrial production, along with phosphate fertilizer, the fast development of phosphoric acid industry, the row of ardealite
High-volume increasingly increase and the big processing mode for mostly using accumulation, utilization rate are relatively low.Currently, only Wet Processes of Phosphoric Acid year arranges in the world
Ardealite is put up to 1.5 hundred million tons, utilization rate only 4.3%~4.6%.The poor efficiency of ardealite is not only seriously limited with bulk deposition
The survival and development of Phosphate Fertilizer Industry, and constitute a kind of pollution sources.Therefore, to ensure the sustainable development of Phosphate Fertilizer Industry,
It is necessary to seek the approach of raising industrial residue phosphogypsum cyclic utilization rate.
Invention content
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of solidifications for reinforcing high organic weak soil
Agent and its application, the curing agent effectively improve the curing degree of organic matter soft soil, reduce influence of the external environment to solidified earth, and profit
With the intumescent filler effect of entringite, improve the physico mechanical characteristic of solidification high organic soil.
A kind of curing agent for reinforcing high organic weak soil, including following component as mass fraction：Common silicic acid
Salt cement 40-70%, ardealite 25-35%, high alumina cement 5-25%, and CaO/Al in the curing agent component2O3Mass values are situated between
In 2-4, SO3/Al2O3Mass values are between 0.8-1.5.
Application of the above-mentioned curing agent in organic matter soft soil solidification, using construction method in situ, according to sitework geology
Curing agent and live soil in-situ are stirred, form pile body, realize the curing process of high organic weak soil by condition；The original position
Construction method is divided into following steps：Determine pile position；The prepared curing agent is sprayed into the soil body using deep mixer,
And it is by stirring blade that the curing agent and soil shear failure is uniform, until design treatment depth.
The stir in situ is divided into grout deep mixing method (wet method) and stir powder spray method (dry method).
The grout deep mixing method refers to going deep into ground by foundation soil using deep mixer using curing agent as slurries
It is stirred evenly with curing agent slurries, the curing agent is chemically reacted with foundation soil, effectively fills soil body gap, and improving height has
The intensity of machine matter soil.
The stir powder spray method refers to going deep into ground by foundation soil using deep mixer using curing agent as powder material
It is stirred evenly with curing agent, the curing agent is chemically reacted with foundation soil, effectively fills soil body gap, improves high organic
The intensity of soil.
The incorporation of the curing agent is the 10-30% of foundation soil dry weight.
Above-mentioned curing agent is no more than 30% organic matter soft soil suitable for the solidification content of organic matter.
Advantageous effect：
Compared with prior art, the present invention generates a large amount of entringite by aluminium, calcium, sulphion reaction, and entringite is to high organic
Soil has good filling consolidation effect, and mechanism, which is the special acicular morphology of entringite, can make original macropore in organic soil
Gap structure is filled, and to reduce soil cracking behavior, and then improves soil strength.
Specific implementation mode
The present invention is further described in detail below by specific embodiment.
Embodiment 1
When the content of organic matter (mass ratio of organic matter and dry foundation soil) is 10% in organic soil, curing agent incorporation is ground
The 30% of base soil dry weight.
A kind of curing agent for reinforcing high organic weak soil, curing agent is by Portland cement, ardealite and high alumina
Cement composition：Portland cement 40-70%, ardealite 25-35%, high alumina cement 5-25%.
Shown in following table, different curing agent are prepared.
| Mass fraction (%) | Formula 1 | Formula 2 | Formula 3 |
| Portland cement | 40 | 50 | 70 |
| Ardealite | 35 | 30 | 25 |
| High alumina cement | 25 | 20 | 5 |
The curing agent for being formulated 1-3 is applied in high organic weak soil, will be stirred evenly using the layering method vibrated
Cure organic soil to be packed into cylindrical die (diameter 5cm, high 10cm).Demoulding, sealing, are sent into standard curing after sample makes
Room, (20 ± 2 DEG C of temperature, 90 DEG C of relative humidity ＞) is conserved 14 days, 28 days and 90 days under the conditions of standard curing.Wait for that sample conserves
To plan age, according to ASTM D2166/D2166M-16 specifications, unconfined compression strength test, test sample are carried out to it
Unconfined compressive strength.Same proportioning makes three parallel samples, takes its average strength as test result.
The result shows that the curing agent has early epistasis, 14 days probe intensities are up to about 680kPa after processing, try within 90 days
Sample intensity can rise to about 1150kPa.It is soft as the solidification high organic of curing agent using Portland cement with same amount
Soil is compared, and the cured solidified earth intensity of Novel curing agent improves 500% or more.
The intensity for curing organic soil and CaO, Al in the curing agent component2O3、SO3Mass ratio it is related：Work as CaO/
Al2O3Mass values increase to 4, and SO from 23/Al2O3Mass values from 0.8 increase in the range of 1.5 when, entringite generate
Rate is very fast and production quantity is suitable, and the unconfined compressive strength of high organic weak soil keeps slowing down after significantly rising the shape of rising
State can obtain higher solidification intensity.Work as CaO/Al2O3When mass values are more than 4, and SO3/Al2O3Mass values are more than 1.5
When, it is unfavorable for the formation and long-time stability of entringite, negative interaction is played to the unconfined compressive strength of soil cement, is cured
It is ineffective.Therefore, it may be verified that can guarantee a large amount of generations of entringite under the proportioning that the present invention studies, and with steady in a long-term
Property.
In addition, the present invention is not limited to the above embodiments, as long as in without departing from the scope of the present invention, can take various
Mode implements the present invention.
Claims (8)
1. a kind of curing agent for reinforcing high organic weak soil, which is characterized in that including following component as mass fraction：
Portland cement 40-70%, ardealite 25-35%, high alumina cement 5-25%, and CaO/Al in the curing agent component2O3Quality
Ratio is between 2-4, SO3/Al2O3Mass values are between 0.8-1.5.
2. the application based on claim 1 gained curing agent in organic soil solidification.
3. application of the curing agent according to claim 2 in organic soil solidification, which is characterized in that using construction in situ
Curing agent and live soil in-situ are stirred according to sitework geological conditions, form pile body by method, realize that high organic is soft
The curing process of soil；The original position construction method is divided into following steps：Determine pile position；It will be prepared using deep mixer
The curing agent spray into the soil body, and it is by stirring blade that the curing agent and soil shear failure is uniform, until design treatment depth
Degree.
4. application of the curing agent according to claim 3 in organic soil solidification, which is characterized in that stir in situ is divided into
Grout deep mixing method and stir powder spray method.
5. application of the curing agent according to claim 4 in organic soil solidification, which is characterized in that the slurries deep layer
Paddling process refers to going deep into ground using curing agent as slurries using deep mixer and stirring foundation soil and curing agent slurries
Even, the curing agent is chemically reacted with foundation soil, effectively fills soil body gap, improves the intensity of high organic soil.
6. application of the curing agent according to claim 4 in organic soil solidification, which is characterized in that the stir powder spray
Method refers to going deep into ground using curing agent as powder material using deep mixer and stirring evenly foundation soil and curing agent, institute
It states curing agent to chemically react with foundation soil, effectively fills soil body gap, improve the intensity of high organic soil.
7. curing agent according to claim 5 or 6 is applied in organic soil solidification, which is characterized in that the curing agent
Incorporation be foundation soil dry weight 10-30%.
8. application of the curing agent according to claim 2 in organic soil solidification, which is characterized in that the organic matter contains
30% of amount no more than organic soil dry weight.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711442101.4A CN108558252A (en) | 2017-12-27 | 2017-12-27 | A kind of curing agent and its application for reinforcing high organic weak soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711442101.4A CN108558252A (en) | 2017-12-27 | 2017-12-27 | A kind of curing agent and its application for reinforcing high organic weak soil |
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| Publication Number | Publication Date |
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| CN108558252A true CN108558252A (en) | 2018-09-21 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101684038A (en) * | 2008-09-28 | 2010-03-31 | 要明伦 | Curing agent and construction method of weak soil |
| CN103979914A (en) * | 2014-05-22 | 2014-08-13 | 同济大学 | Curing agent for reinforcing and treating soft soil foundation constructed at low temperature and preparation method thereof |
| CN105924109A (en) * | 2016-04-21 | 2016-09-07 | 天津市三川恒泰科技有限公司 | Beach sludge composite curing agent as well as preparation method, use method and application thereof |
| CN107162549A (en) * | 2017-06-05 | 2017-09-15 | 东南大学 | The curing agent and application method of heavy metal pollution site remediation based on entringite |
-
2017
- 2017-12-27 CN CN201711442101.4A patent/CN108558252A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101684038A (en) * | 2008-09-28 | 2010-03-31 | 要明伦 | Curing agent and construction method of weak soil |
| CN103979914A (en) * | 2014-05-22 | 2014-08-13 | 同济大学 | Curing agent for reinforcing and treating soft soil foundation constructed at low temperature and preparation method thereof |
| CN105924109A (en) * | 2016-04-21 | 2016-09-07 | 天津市三川恒泰科技有限公司 | Beach sludge composite curing agent as well as preparation method, use method and application thereof |
| CN107162549A (en) * | 2017-06-05 | 2017-09-15 | 东南大学 | The curing agent and application method of heavy metal pollution site remediation based on entringite |
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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Dingwen Inventor after: Zhou Ruoyun Inventor after: Liu Ziming Inventor after: Xiang Lian Inventor before: Zhang Dingwen Inventor before: Zhou Ruyun Inventor before: Liu Ziming Inventor before: Xiang Lian |
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20180921 |