CN102557536A - Curing agent for littoral-facy soft soil - Google Patents
Curing agent for littoral-facy soft soil Download PDFInfo
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- CN102557536A CN102557536A CN2011104041261A CN201110404126A CN102557536A CN 102557536 A CN102557536 A CN 102557536A CN 2011104041261 A CN2011104041261 A CN 2011104041261A CN 201110404126 A CN201110404126 A CN 201110404126A CN 102557536 A CN102557536 A CN 102557536A
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- solidifying agent
- littoral
- weak soil
- cement
- soil
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Abstract
The invention discloses a curing agent for littoral-facy soft soil. The curing agent consists of the following components in percentage by mass: 35-45% of cement, 35-45% of carbide slag, 15-20% of gypsum and 1-5% of surfactant. The main components of the curing agent come from industrial waste, and the cost is low; and meanwhile, compared with the cement curing agent, the curing agent disclosed by the invention has a better effect on curing the littoral-facy soft soil, and the engineering properties required for curing the littoral-facy soft soil can be realized.
Description
Technical field
The present invention relates to a kind of civil construction material, specifically, relate to a kind of solidifying agent that is used for the littoral facies weak soil.
Technical background
The China's Coastal Areas weak soil distributes extensively, characteristics such as generally have high-moisture percentage, high-compressibility, high void ratio, low strength, low-permeability, highly sensitive, perturbation is big, rheological property is remarkable.Salinity and organic existence in the littoral facies weak soil soil body make soil structures and composition relative complex, physico-mechanical properties differ bigger simultaneously.Reinforcing utilization to the littoral facies weak soil has become one of key technical problem of littoral facies Soft Ground.
A lot of for littoral facies weak soil method of disposal at present, the normal mixing pile that shallow-layer solidification treatment and deep layer are arranged that adopts is handled.It all is the intensity that improves the soil body through the way of adding solidifying agent (like cement etc.) in essence for these two kinds of methods.Yet because the singularity of littoral facies weak soil adopts the intensity of the soil after traditional solidifying agent is handled still on the low side, consolidation effect is undesirable.
Summary of the invention
Technical problem: technical problem to be solved by this invention is: a kind of solidifying agent that is used for the littoral facies weak soil is provided; This solidifying agent staple comes from industrial waste; With low cost, simultaneously, be that solidifying agent is compared with cement; This solidifying agent solidifying beach phase weak soil effect is better, can reach the needed engineering characteristic of solidifying beach phase weak soil.
Technical scheme: for solving the problems of the technologies described above, the technical scheme that the present invention adopts is:
A kind of solidifying agent that is used for the littoral facies weak soil, according to mass percent, this solidifying agent is composed of the following components:
Cement 35～45%,
Carbide slag 35～45%,
Gypsum 15～20%,
Tensio-active agent 1～5%.
Beneficial effect: compared with prior art, adopt the beneficial effect of the littoral facies soft soil curing agent of present technique scheme to be:
1. help economizing on resources, environment protection.The component of solidifying agent of the present invention is cement, carbide slag, gypsum and tensio-active agent, and wherein, carbide slag and gypsum derive from industrial waste, and the massfraction that carbide slag and gypsum account for solidifying agent is more than 50%.Therefore prepare solidifying agent of the present invention, staple only need be extracted from industrial waste, has realized effective utilization of industrial waste.And existing solidifying agent, for example cement and lime all need industrial preparation, need utilize industrial raw material.Thus, solidifying agent of the present invention can consume a large amount of industrial wastes, economizes on resources, and helps environment protection, belongs to low-carbon (LC), green, environmentally friendly machine.
2. this solidifying agent solidifying beach phase weak soil effect is better, can reach the needed engineering characteristic of solidifying beach phase weak soil.In the present technique scheme; It through admixture mass fraction in the littoral facies weak soil 4%～12% solidifying agent of the present invention; Make the pore abundance of solidifying beach phase weak soil reduce, the degree of compactness of soil increases, and early strength is high, the later strength development potentiality is big, water stability is good.And in the prior art, admixture cement, the perhaps littoral facies weak soil of the mixture of cement and lime, intensity is less, water stability is relatively poor, can not satisfy the Engineering Control index.
3. preparation cost is cheap.The very easily acquisition of constituent materials various places of solidifying agent of the present invention, cost low (than the low 30%-40% of similar products).When preparing simultaneously, only need each component grinding be powdery, remix stirs and gets final product.The preparation process is simple.During curing, only need be according to engine request, get an amount of solidifying agent of the present invention and mix stirring with the littoral facies weak soil and get final product.Construction technology is simple.Therefore, solidifying agent preparation cost of the present invention is cheap, construction technology is simple, has good economic benefit.And existing solidifying agent, cement or lime, the preparation process is more complicated than the preparation process of solidifying agent of the present invention, and Financial cost is high.
Embodiment
A kind of solidifying agent that is used for the littoral facies weak soil of the present invention, according to mass percent, this solidifying agent is composed of the following components:
Cement 35～45%,
Carbide slag 35～45%,
Gypsum 15～20%,
Tensio-active agent 1～5%.
This solidifying agent that is used for the littoral facies weak soil be with industrial waste as main ingredient, that is to say that carbide slag and gypsum can extract from industrial waste.Tensio-active agent is subsidiary material.This tensio-active agent adopts strong basicity oxyhydroxide, for example can be sodium hydroxide, perhaps Pottasium Hydroxide.
When preparing this solidifying agent, the even stirring of cement, carbide slag, gypsum and tensio-active agent got final product.Be blocks if having in these components, gypsum for example, the component that needs so at first to be blocks is ground into powder, and then be that pulverous other components are mixed, stirring gets final product.
When solidifying agent of the present invention is used for solidifying beach phase weak soil,, each component of solidifying agent is mixed the back fully stir according to the engineering demand ratio.For shallow-layer littoral facies weak soil, solidifying agent is evenly spread in the pending ground in shop, stir again.For deep layer littoral facies weak soil; The proportioning that solidifying agent is confirmed by design is mixed and is processed slurry; Treat to pour slurry into aggregate bin before the mud jacking, slurries are pressed in the pending ground at ground through the deep mixer tool and force uniform mixing, make littoral facies soft clay ground scleroma pile, wall etc. improve intensity.
Desire improves the intensity of solidified earth; Must solidifying agent between each component and various physics chemical action effects take place between each component of solidifying agent and the soil particle; Generate its unique hydrate system; Make full use of good synergistic between each component, guarantee that the process of growth of swelling property hydrate and cementing properties hydrate must be coordinated.
Moisture in the initial reaction stage, this curing agent component in cement and the soil excites down at the strong basicity environment that provides of tensio-active agent NaOH (or KOH), and cement generation intensive hydrolysis and hydration reaction have improved the early strength of solidified earth, increase the efficient of reaction.From solution, decomposite Ca (OH) simultaneously
2Be the basis of subsequent reactions, it forms hydrate and has the intensive adsorption activity, and these bigger mass of soil grains are further combined, and has formed the chain form structure of cement-earth, and hole between the sealing mass of soil forms stable connection.
Salinity generation ion exchange reaction: Ca in carbide slag and the soil in the curing agent component
2++ soil particle) Na
+(K
+Soil particle+the Na of) → Ca)
+(K
+) or (Ca (OH)
2+ NaCl → CaCl
2+ NaOH) strengthened the alkalescence of compound, continued to promote hydrolysis, the hydration of cement, make cement can bring into play it better, more fully and solidify stabilising effect.Mineral SiO in the soil
2And Al
2O
3Under alkaline environment, generate water-fast CaO-Al
2O
3-H
2O series hydrate and CaO-SiO
2-H
2O seriation thing etc.And the Ca in the carbide slag (OH)
2Constantly absorb the CO in the water
2, carburizing reagent: Ca (OH) takes place
2+ CO
2→ CaCO
3+ H
2O, CaCO3 make native conglomeration, coarse, fill compacted soil body space, improve intensity.
The gypsum effect is that CaSO takes place in the curing agent component
4+ NaCl → CaCl
2+ Na
2SO
4Reaction, the CaCl of generation
2Has strong water-absorbent, simultaneously along with CaCl
2Concentration increases, and the surface tension of soil particle pore water increases, thereby improves intergranular cohesive force, makes the solidified earth later strength increase.In various component generations, development and solidified earth intensity raising process, gypsum has promoted that intergranular expansion is compacted, shortens spacing of particle, increases particle contact area and quantity, thereby the structure between enhanced granule connects, and improves the speed and the degree of reaction simultaneously.
The strong basicity environment that continues between each component of solidifying agent and the soil body has promoted the aquation and the hydrolysis of cement, and the reaction between the gypsum and the soil body, makes solidified earth can produce bigger synergistic effect in early days and between each reaction of later stage, improves intensity and globality.
Further specify technical scheme of the present invention through embodiment and Comparative Examples below.In following examples and Comparative Examples, (unit: kPa) represent to reinforce the strength characteristics of littoral facies weak soil, this numerical value is high more, explains that the intensity of reinforcing the littoral facies weak soil is just high more with unconfined compression strength; The steady coefficient of water representes to reinforce the water stability of littoral facies weak soil; The steady coefficient of water is the ratio of unconfined compression strength of unconfined compression strength and the normal curing test specimen of curing in water test specimen; The steady coefficient of water explains that more near 1 the water stability of reinforcing the littoral facies weak soil is good more.
Each component of the solidifying agent that uses in the present technique scheme can be buied through market.
Embodiment 1
(1) test materials
The littoral facies weak soil: used soil sample is taken from the typical littoral facies weak soil in area, Lianyun Harbour, Jiangsu, has carried out airing before use, its basic physical mechanical property index such as table 1.
The basic physico-mechanical properties of area, table 1 Lianyun Harbour littoral facies weak soil
Cement: " day Golconda board " 32.5# ordinary Portland cement of producing for the imperial cement in Nanjing three ltd; Test according to the GB/T1346-2001 testing regulation; Initial set, final setting time are respectively 205min, 260min; Ultimate compression strength is 12.5Mpa, and cement fineness, stability all meet the quality standard requirement of GB175-1999.
Carbide slag: for Jiangsu Province Changzhou acetylene manufacturing company produces, wherein CaO content is 68.99%, and loss on ignition is 24.85%.
Gypsum: for the south of the River, Nanjing cement ltd produces, available silicon content is 56.8%, and specific surface area is 35000cm
2/ g.
Tensio-active agent NaOH: for the grand spark chemical industry in Nanjing trade Co., Ltd produces, analytical pure, White-opalescent solid.
(2) TP
The first step: preparation is used for the solidifying agent of littoral facies weak soil: cement 40%, carbide slag 40%, gypsum 15%, tensio-active agent 5% are evenly mixed, form solidifying agent.
Second step: the solidifying agent of the first step preparation is mixed with the mass ratio of littoral facies weak soil according to 4: 96, and evenly stir.
The 3rd step: carry out unconfined compressive strenght test (comprising the stable experiment of water).
Unconfined compressive strenght test: sample is the right cylinder of φ 5cm * 5cm, when optimum moisture content, adopts the static(al) compaction moulding, and compactness is 96%, and conservation system is normal curing: when curing age was 7 days, mark was supported 6 days, soaked 1 day; When curing age was 28 days, mark was supported 27 days, soaked 1 day.Curing in water: when curing age was 7 days, mark was supported 3 days, soaked 4 days; When curing age was 28 days, mark was supported 7 days, soaked 21 days.The steady coefficient of water: for same sample, the steady coefficient of water is the ratio of unconfined compression strength of unconfined compression strength and the normal curing test specimen of curing in water test specimen.
More than test is all carried out according to highway earthwork test rule (JTG E40-2007) and highway engineering stabilized with inorganic binder testing of materials rules (JTG E51-2009).
(3) experimental result
Experimental result is as shown in table 3.
Embodiment 2
The mass percent of each component is all identical with embodiment 1 in the test materials of present embodiment and the solidifying agent, and different is second step of TP, and solidifying agent is different with the mass ratio of littoral facies weak soil.The mass ratio of solidifying agent and littoral facies weak soil is 8: 92 in the present embodiment.Experimental result is as shown in table 3.
Embodiment 3
The mass percent of each component is all identical with embodiment 1 in the test materials of present embodiment and the solidifying agent, and different is second step of TP, and solidifying agent is different with the mass ratio of littoral facies weak soil.The mass ratio of solidifying agent and littoral facies weak soil is 12: 88 in the present embodiment.Experimental result is as shown in table 3.
Embodiment 4
The test materials of present embodiment is identical with embodiment 1, and different is the TP the first step, and the mass percent of the each component in the solidifying agent of preparation is different, and TP in second step solidifying agent different with the mass ratio of littoral facies weak soil.Concrete numerical value is as shown in table 2.Experimental result is as shown in table 3.
Embodiment 5
The test materials of present embodiment is identical with embodiment 1, and different is the TP the first step, and the mass percent of the each component in the solidifying agent of preparation is different, and TP in second step solidifying agent different with the mass ratio of littoral facies weak soil.Concrete numerical value is as shown in table 2.Experimental result is as shown in table 3.
Embodiment 6
The test materials of present embodiment is identical with embodiment 1, and different is the TP the first step, and the mass percent of the each component in the solidifying agent of preparation is different, and TP in second step solidifying agent different with the mass ratio of littoral facies weak soil.Concrete numerical value is as shown in table 2.Experimental result is as shown in table 3.
Comparative Examples 1
Experiment material in this Comparative Examples: the littoral facies weak soil is identical with embodiment 1; Solidifying agent adopts cement.After solidifying agent and littoral facies weak soil evenly mixed according to 8: 92 mass ratio, carry out unconfined compressive strenght test.The test conditions of unconfined compressive strenght test is all identical with embodiment 1 with TP.Experimental result is as shown in table 3.
Comparative Examples 2
Experiment material in this Comparative Examples: the littoral facies weak soil is identical with embodiment 1; Solidifying agent adopts the mixture of lime and cement, wherein, and according to mass percent: lime 66.5%, cement 33.5%.After solidifying agent and littoral facies weak soil evenly mixed according to 8: 92 mass ratio, carry out unconfined compressive strenght test.The test conditions of unconfined compressive strenght test is all identical with embodiment 1 with TP.Experimental result is as shown in table 3.
Table 2: testing program
Table 3: unconfined compressive strenght test result (kPa)
Test-results data according to table 3; Embodiment 1,2,3 can find out: the intensity through adding the 7 day length of time of 4%, 8%, 12% solidifying agent solidifying beach phase weak soil has reached 450.6kPa, 551.1kPa, 690.4kPa respectively, explains that the early strength of this solidified earth is high; And the intensity of this solidifying agent littoral facies weak soil is along with the increase of volume is greatly improved.Can find out in conjunction with embodiment 1,2,3,4,5 and 6: the intensity of this solidifying agent littoral facies weak soil is along with the increase in the length of time also is greatly improved.For example: in embodiment 5; During the 7 day length of time, the intensity of 8% solidifying agent littoral facies weak soil is 560.2kPa, and the intensity of solidifying agent littoral facies weak soil has then reached 845.2kPa in the time of 28 days; Improved 1.50 times, explained that the later strength potentiality of this curing silt are bigger.Can find out that from Comparative Examples 1 and 2 intensity of this solidifying agent of admixture littoral facies weak soil all has bigger increase with respect to the cement of equal volume or the littoral facies weak soil intensity of lime and cement.For example, during the 7 day length of time, the littoral facies weak soil intensity of this solidifying agent of admixture minimum is 516.3kPa, be 578.6kPa to the maximum, and the intensity of cement littoral facies weak soil is 500.7kPa, and the intensity of lime and cement littoral facies weak soil is 454.1kPa.This solidifying agent of admixture littoral facies weak soil, the steady coefficient of water in the 7 day length of time and the 28 day length of time is all greater than 0.94, and water stability is good, can satisfy the needs of foundation treatment engineerings such as motorway fully.
Claims (6)
1. a solidifying agent that is used for the littoral facies weak soil is characterized in that, according to mass percent, this solidifying agent is composed of the following components:
Cement 35～45%,
Carbide slag 35～45%,
Gypsum 15～20%,
Tensio-active agent 1～5%.
2. according to the described solidifying agent that is used for the littoral facies weak soil of claim 1, it is characterized in that in the described solidifying agent, tensio-active agent is a strong basicity oxyhydroxide.
3. according to the described solidifying agent that is used for the littoral facies weak soil of claim 2, it is characterized in that described tensio-active agent is a sodium hydroxide, perhaps Pottasium Hydroxide.
4. according to the described solidifying agent that is used for the littoral facies weak soil of claim 3, it is characterized in that, described solidifying agent, according to mass percent,
Cement 40%,
Carbide slag 40%,
Gypsum 18%
Sodium hydroxide 2%.
5. according to the described solidifying agent that is used for the littoral facies weak soil of claim 3, it is characterized in that, described solidifying agent, according to mass percent,
Cement 44%,
Carbide slag 35%,
Gypsum 20%,
Sodium hydroxide 1%.
6. according to the described solidifying agent that is used for the littoral facies weak soil of claim 3, it is characterized in that, described solidifying agent, according to mass percent,
Cement 45%,
Carbide slag 35%,
Gypsum 15%,
Sodium hydroxide 5%.
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| CN2011104041261A CN102557536A (en) | 2011-12-08 | 2011-12-08 | Curing agent for littoral-facy soft soil |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103539389A (en) * | 2012-07-16 | 2014-01-29 | 浙江海洋学院 | Preparation method of seawater mixing cemented soil |
| CN105152615A (en) * | 2015-08-20 | 2015-12-16 | 刘祥勇 | All solid waste based soft soil foundation consolidation and pressure-relief material as well as application method thereof |
| CN105418005A (en) * | 2015-11-20 | 2016-03-23 | 南京工程学院 | Rapid curing agent for soft soil |
| 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 |
| CN111153668A (en) * | 2019-12-28 | 2020-05-15 | 肇庆市武大环境技术研究院 | Roadbed composite material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN111153668A (en) * | 2019-12-28 | 2020-05-15 | 肇庆市武大环境技术研究院 | Roadbed composite material and preparation method thereof |
| CN111153668B (en) * | 2019-12-28 | 2021-04-23 | 肇庆市武大环境技术研究院 | Roadbed composite material and preparation method thereof |
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Application publication date: 20120711 |