CN102030495A - Cement and soil composite addictive based on impermeable function - Google Patents
Cement and soil composite addictive based on impermeable function Download PDFInfo
- Publication number
- CN102030495A CN102030495A CN 201010534994 CN201010534994A CN102030495A CN 102030495 A CN102030495 A CN 102030495A CN 201010534994 CN201010534994 CN 201010534994 CN 201010534994 A CN201010534994 A CN 201010534994A CN 102030495 A CN102030495 A CN 102030495A
- Authority
- CN
- China
- Prior art keywords
- cement
- soil
- polyacrylamide
- earth
- antiseepage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a cement and soil composite addictive based on an impermeable function, which can greatly improve the damage strain of cement and soil and the flexibility of materials and simultaneously ensure that the cement and the soil have low impermeability. The composite addictive comprises the following component based on the weight of the mixed soil: 3-7 percent of doped cement/mixed soil and 0.1-0.3 percent of doped polyacrylamide/mixed soil, wherein the cement is ordinary Portland cement. The polyacrylamid is negative polyacrylamid. The negative polyacrylamid has characteristics of water absorption, flocculation and the like, so that the composite addictive is suitable for construction in a saturated soil body by adopting a dry method.
Description
Technical field
The present invention is the composite additive of cut-pff wall in a kind of pattern foundation pit supporting structure, cement-earth antiseepage bed course or seepage proof curtain, belongs to the technical field in Communication and Transportation Engineering and the civil engineering work.
Background technology
Need to set cut-pff wall and be used for sealing and antiseepage function in large-scale foundation pit supporting project, wherein support pile generally adopts cast-in place pile etc., and cut-pff wall generally adopts mixing pile.In order to guarantee the barrier performance of mixing pile, mixing pile has higher intensity in the construction, as 0.8-1.0MPa, this intensity makes that the rigidity of mixing pile is bigger, when the defectiveness of support system part (contacting the position between two), bigger distortion may take place in mixing pile, and this moment, breakages such as this section or cracking took place in the part mixing pile easily, and then influences the barrier performance of cut-pff wall integral body.
Cement-earth is used to antiseepage bed course or seepage proof curtain in some engineerings, as some dyke seepage preventions, dam foundation impervious wall and refuse landfill, in order to guarantee that cement-earth has good barrier performance and lower perviousness, the strength and stiffness of cement-earth are corresponding bigger, breaking strain this moment is very little, is generally less than 1%.When being subjected to horizontal force action, shear fracture easily takes place, breaks and destroy or damage, and then produce seepage channel under the acting in conjunction of shearing force and moment of flexure in antiseepage bed course or curtain, weakens the function of antiseepage.
Requirement at impervious cement-earth wall in the pattern foundation pit supporting structure and cement-earth antiseepage bed course and seepage proof curtain: (1) low-permeability; (2) seepage prevention has bigger toughness, and the strain when promptly destroying is bigger; (3) cement-earth itself has certain intensity, and traditional single cement mixes material formation cement-earth and is difficult to satisfy simultaneously above-mentioned three requirements.
Along with the development of chemical industry, high performance macromolecular material uses in the field of civil engineering gradually.Polyacrylamide (PAM) is a kind of high molecular weight water soluble polymer, be insoluble to most of organic solvents, has good flocculence, can reduce the frictional resistance between the liquid, divide by ion characteristic and can be divided into four types of nonionic, negatively charged ion, positively charged ion and amphoteric, mainly contain following 4 purposes: (1) makes retention aid, strengthening agent in paper-making process; (2) make coagulant aids, flocculation agent, sludge dehydrating agent in the water treatment; (3) make precipitation agent, oil-displacing agent in the petroleum drilling and mining; (4) also be widely used in aspects such as thickening, stable colloid, drag reduction, bonding, film forming, biomedical material.
Summary of the invention
Technical problem:The present invention is directed to and exist cement-earth that traditional single cement mixes formation in the engineering practice of cement mixing method cut-pff wall, cement-earth antiseepage bed course and seepage proof curtain when satisfying seepage prevention system and having than low-permeability, strength and stiffness are bigger, breaking strain is less, when this class formation takes place under the acting in conjunction of shearing stress and moment of flexure by damage and destruction easily, weaken this present situation of anti-seepage effect, propose cement and negative polyacrylamide and formed cement-earth, the requirement that reaches low-permeability, havoc strain and have certain intensity as additive jointly.
Technical scheme:Cement-earth composite additive based on the antiseepage purposes of the present invention is made up of cement and polyacrylamide, in consisting of by mix soil property amount:
The admixture cement quality: by mix soil property amount is 3-7%, the polyacrylamide quality of admixture: by mix soil property amount is 0.1%-0.3%.
Described cement is ordinary Portland cement.
The negative polyacrylamide of described polyacrylamide.
Beneficial effect:Polyacrylamide and cement and saturated foundation soil stir form cement-earth breaking strain between 2%-6.0%, doubly than the big 2-6 of breaking strain of conventional cement-earth; Permeability coefficient is about 10
-9Cm/s, suitable with conventional permeability coefficient of cement soil, but than little 2 orders of magnitude of foundation soil; Intensity increases with the increase of cement mixing content, the increase of polyacrylamide and reducing, and the adjustment by proportioning can reach the needed intensity of engineering.In sum, the destruction characteristic that can change conventional soil cement greatly of polyacrylamide cement-earth, and can guarantee perviousness and the requirement of strength that cement-earth is very low simultaneously, and then satisfy the engine request of cut-pff wall, bed course and the curtain of antiseepage requirement.
Embodiment
The present invention adopts negative polyacrylamide and cement as additive, make the cement-earth composite additive of the antiseepage purposes that satisfies above-mentioned requirements, to antiseepage type cement mixing method apply and the expansion of cement-earth purposes has important significance for theories and construction value.
The cement-earth composite additive of antiseepage purposes of the present invention is formed with ordinary Portland cement and negative polyacrylamide, wherein cement mixed ratio (admixture cement quality/by mix soil property amount) is 3-7%, and mixing than (the polyacrylamide quality of admixture/by mix soil property amount) of polyacrylamide is 0.1%-0.3%.
1) additive with the cement-earth of traditional antiseepage purposes is extended for cement and the two composite additive of forming of polyacrylamide by cement;
2) volume of polyacrylamide is that 0.1%-0.3% gets final product in the composite additive, and the volume of cement is between 3%-7% the time, and the intensity of cement-earth, breaking strain and permeability coefficient can access control preferably;
3) stir the cement-earth that forms by composite additive and saturated foundation soil, it is big to have a breaking strain, the characteristics that controllable intensity and permeability coefficient are little;
4) because polyacrylamide has very strong water absorbing properties and flocculating properties, this composite additive should adopt dry construction better effects if in saturated foundation soil simultaneously;
Polyacrylamide is incorporated in the additive of cement-earth, mechanism such as suction, flocculation, bonding and film forming by polyacrylamide, improve the breaking strain of cement-earth, reduced the Penetration Signature of cement-earth, reached the engine request of cut-pff wall, antiseepage bed course and seepage proof curtain.
Because the difference of the basic physical index of each department weak soil should be carried out Mix Ratio Test in conjunction with concrete weak soil, determine the proportioning of cement and polyacrylamide in the composite additive.
Have very strong flocculating property based on polyacrylamide, mixing pile or cement-earth should adopt dry construction.If adopt wet construction, then polyacrylamide can absorb the water in the slurries, increases the concentration and the viscosity factor of slurries, and phenomenons such as plugging take place easily.
Because polyacrylamide has functions such as good flocculation, stable colloid, drag reduction, bonding, film forming, under user mode, ground is in state of saturation and more helps the polyacrylamide cement-earth and bring into play its barrier performance.
Such composite additive to antiseepage type cement mixing method apply and the expansion of cement-earth purposes has important significance for theories and construction value.
Example: the basic physical properties of Fujian Ke Mengang silt soil is listed in table 1, and wherein the liquid plastic limit adopts 100g bevel-type liquid plastic combine tester to measure, and proportion is to be recorded by pycnometric method.
The basic parameter of table 1 test soil sample
According to the correlation test rules, at first mud is carried out natural drying, pulverize and cross the sieve of 0.5mm then through pulverizer, measure the water ratio that dries the back soil sample; Naturally it is 66% sample that the soil sample after drying is become water ratio by stirrer configuration, puts it in the holding barrel and sealing, makes water ratio even; Manipulated soil is made saturated sample measure its permeability coefficient; Be to mix 3%, 5% and 7% P.O.42.5 cement and 0.1% and 0.3% negative polyacrylamide in 66% the soil respectively to water ratio, fully stir with agitator, adopt the die trial of 70.7mm * 70.7mm * 70.7mm specification, manual jolt ramming is wipeed off, make sample, cover film, leave standstill 24h after, the demoulding, put into the standard curing room maintenance, 7 days, 14 days and the 28 day length of time, carry out water ratio, unit weight, void ratio, unconfined compression test and permeability test respectively, the result is as shown in table 2.
Table 2 test-results
Above test-results shows that when the polyacrylamide of employing 0.1% and 7% cement, 28 days age strengths of cement-earth reach 1.25MPa, and totally between 2%-3%, permeability coefficient is at 2.4-8.7*10 in breaking strain
-9Cm/s; When the polyacrylamide of employing 0.1% and 5% cement, 28 days age strengths of cement-earth reach 0.46MPa, and totally between 2.9%-3.5%, permeability coefficient is at 5.5-8.5*10 in breaking strain
-9Cm/s; When the polyacrylamide of employing 0.1% and 3% cement, 28 days age strengths of cement-earth reach 0.20MPa, and totally between 4.2%-5.0%, permeability coefficient is at 7.1-12*10 in breaking strain
-9Cm/s; Therefore 0.1% polyacrylamide mix than the time, adopt the cement mixed ratio of 5%-7%, the soil cement intensity that obtains, permeability coefficient and breaking strain are in proper scope.
When polyacrylamide mix than be 0.3% and cement-earth mix than for 5%-7%, soil cement intensity is between 0.25-0.46MPa, breaking strain is at 3.8%-4.8%, and permeability coefficient is at 3.6-6.8*10
-9Cm/s, breaking strain this moment, intensity and permeability coefficient are also in relatively reasonable scope.Need to prove along with polyacrylamide mix than increase, the intensity of cement-earth is the trend of reduction after the modification, and the reasonable volume that needs to determine according to particular case polyacrylamide in the engineering is described.
Claims (3)
1. cement-earth composite additive based on the antiseepage purposes is characterized in that this composite additive is made up of cement and polyacrylamide, in consisting of by mix soil property amount:
The admixture cement quality: by mix soil property amount is 3-7%;
The polyacrylamide quality of admixture: by mix soil property amount is 0.1%-0.3%.
2. the cement-earth composite additive based on the antiseepage purposes according to claim 1 is characterized in that institute
The cement of stating is ordinary Portland cement.
3. the cement-earth composite additive based on the antiseepage purposes according to claim 1 is characterized in that institute
The negative polyacrylamide of the polyacrylamide of stating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010534994 CN102030495A (en) | 2010-11-08 | 2010-11-08 | Cement and soil composite addictive based on impermeable function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010534994 CN102030495A (en) | 2010-11-08 | 2010-11-08 | Cement and soil composite addictive based on impermeable function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102030495A true CN102030495A (en) | 2011-04-27 |
Family
ID=43884018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010534994 Pending CN102030495A (en) | 2010-11-08 | 2010-11-08 | Cement and soil composite addictive based on impermeable function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102030495A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106966627A (en) * | 2017-04-11 | 2017-07-21 | 安徽省明美矿物化工有限公司 | A kind of concave convex rod cementitious composite additive and preparation method |
| CN108191309A (en) * | 2017-12-22 | 2018-06-22 | 东南大学 | A kind of improved foundation silt and the method using its progress roadbed filling |
| CN111855528A (en) * | 2020-07-23 | 2020-10-30 | 西南大学 | Directional porous material permeability regulating and controlling method based on electric field intensity regulation and control and product thereof |
| CN114956706A (en) * | 2021-12-27 | 2022-08-30 | 昆明理工大学 | Anti-corrosion cement soil for peat soil and preparation method thereof |
-
2010
- 2010-11-08 CN CN 201010534994 patent/CN102030495A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 《中国优秀硕士论文全文数据库-工程科技Ⅱ辑》 20080531 王春波 天津滨海新区吹填土固化技术及固化机理研究 第18-22页 1-3 , 第05期 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106966627A (en) * | 2017-04-11 | 2017-07-21 | 安徽省明美矿物化工有限公司 | A kind of concave convex rod cementitious composite additive and preparation method |
| CN108191309A (en) * | 2017-12-22 | 2018-06-22 | 东南大学 | A kind of improved foundation silt and the method using its progress roadbed filling |
| CN108191309B (en) * | 2017-12-22 | 2021-02-02 | 东南大学 | Modified roadbed silty soil and method for roadbed filling by using same |
| CN111855528A (en) * | 2020-07-23 | 2020-10-30 | 西南大学 | Directional porous material permeability regulating and controlling method based on electric field intensity regulation and control and product thereof |
| CN114956706A (en) * | 2021-12-27 | 2022-08-30 | 昆明理工大学 | Anti-corrosion cement soil for peat soil and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Estabragh et al. | Treatment of an expansive soil by mechanical and chemical techniques | |
| Luo et al. | Cohesive soil stabilized using sewage sludge ash/cement and nano aluminum oxide | |
| Kolay et al. | Tropical peat soil stabilization using class F pond ash from coal fired power plant | |
| Shrivastava et al. | Effect of lime and rice husk ash on engineering properties of black cotton soil | |
| CN104108905A (en) | Early-strength composite curing agent for high-organic-matter mudflat silt and application thereof | |
| Sharo et al. | Enhancement of the strength and swelling characteristics of expansive clayey soil using nano-clay material | |
| CN108165273A (en) | A kind of liquid soil-solidified-agent | |
| CN102030495A (en) | Cement and soil composite addictive based on impermeable function | |
| Thyagaraj et al. | Laboratory investigations of in situ stabilization of an expansive soil by lime precipitation technique | |
| Noaman et al. | A review on the effect of fly ash on the geotechnical properties and stability of soil | |
| CN104449746B (en) | A kind of soil-solidified-agent and its application method and application | |
| Zhang et al. | Flocculation–solidification combined method for treatment of hydraulically dredged mud at extra high water content | |
| Wu et al. | Stabilization mechanism of calcium lignosulphonate used in expansion sensitive soil | |
| CN103964809B (en) | Hydraulic reclamation marine mud curing agent and curing thereof | |
| Weng et al. | Improving the unconfined compressive strength of red clay by combining biopolymers with fibers | |
| Sadrjamali et al. | Modifying soil shear strength parameters using additives in laboratory condition | |
| CN104291733A (en) | Toughened anti-channeling agent for cement and toughened cement for cementing shale gas horizontal well | |
| Yao et al. | Effect of freeze-thaw cycle on shear strength of lime-solidified dispersion soils | |
| Athira et al. | Expansive soil stabilization using coconut shell powder and lime | |
| CN114315294B (en) | Low-strength tough waterproof concrete for underground engineering and preparation method thereof | |
| Kasim et al. | Unconfined compressive strength and microstructure of clay soil stabilised with biomass silica | |
| Wu et al. | Solidification of fluviatile-lacustrine facies silt with ionic soil stabilizer | |
| CN115142578A (en) | Iron tailing and glutinous rice modified rammed earth wall and preparation method thereof | |
| Goutham et al. | Improvement in Geotechnical Properties of Expansive Soil Using Various Stabilizers: A Review | |
| Huang et al. | Application of water-soluble polymers in soil quality improvement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110427 |