CN103013526B - Soil solidifier and soil solidification method - Google Patents
Soil solidifier and soil solidification method Download PDFInfo
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- CN103013526B CN103013526B CN201210541752.XA CN201210541752A CN103013526B CN 103013526 B CN103013526 B CN 103013526B CN 201210541752 A CN201210541752 A CN 201210541752A CN 103013526 B CN103013526 B CN 103013526B
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- soil
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- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a soil solidifier and a soil solidification method. The soil solidifier comprises 15 to 30 percent of fly ash, 4 to 15 percent of lime, 10 to 20 percent of sodium silicate, 8 to 20 percent of caustic soda, 5 to 16 percent of gypsum, 10 to 32 percent of common silicate cement, 0.5 to 3.5 percent of fluorite and 0 to 1.5 percent of sodium sulfate. During solidification of soil, the soil solidifier is tight, relatively low in contraction and swelling coefficient and extremely small in solidified soil body contraction amount; deformation and cracks which are caused by expansion with heat and contraction with cold because of temperature change are avoided; therefore, the solidified soil body is high in seepage resistance, freezing resistance and cracking resistance; the problems of low water stability, high dry cracking performance and simplicity in cracking during solidification of the soil by the conventional solidification material are well solved; and the solidified soil body has a relatively good heat isolation function. The soil solidification method is easy to construct, time-saving and labor-saving; the solidifier cannot be influenced by the temperature; the solidification time is short; the working efficiency is high; the working period can be greatly shortened; and the cost is reduced.
Description
Technical field
The present invention relates in technical field of civil engineering, be specifically related to a kind of soil-solidified-agent and soil solidification method.
Background technology
Curing being actually with additive of soil carried out physical chemistry processing to the soil body, changes composition of the soil, changes the engineering properties of the soil body, thereby reaches the object that improves soil strength, improves soil property compactibility.Coal ash soil soil curing agent is to take flyash as main; by multiple inorganic and organic materials, after rational Match, formulated hydraulic cementing materials; belong to a kind of New Building Materials, at normal temperatures direct binder soil soil particle or can react with clay mineral and generate gum material.
20 beginnings of the century, some developed countries are owing to building the needs of the engineerings such as road, harbour, adopt lime, cement to soil improvement, first stage of construction has been obtained good effect, but in long-term soil solidification engineering, people progressively recognize, adopt merely the soil curing materials such as traditional lime, cement, exist obvious deficiency, can not meet engineering construction development need.Therefore, find soil solidification stable, water stability is good, and convergent-divergent is little, nontoxic, energy-conservation, and the soil curing material of the feature such as easy construction just seems very necessary.
Along with the fast development that highway in China is built, the soil-solidified-agent demand of high performance-price ratio becomes clear day by day, although and the soil-solidified-agent kind of selling on the market is at present more, the following problem of ubiquity:
1. ultimate compression strength does not reach industry standard.Highway in China divides five grades two standards, and motorway and Class I highway require 7 days full water ultimate compression strength of solidified earth more than 5MPa, two, three, Class IV highway requires the full water ultimate compression strength in sky of solidified earth to be greater than 3MPa(CJJ/T801998).The soil-solidified-agent being applied at present in highway construction can only make up intensity by increasing incorporation.
2. expensive.China domestic soil-solidified-agent manufacturer seldom, only has Beijing, several of Tianjin production unit, and the Kao Cong U.S., Japan, Australian import, increased cost greatly in a large number.The soil-solidified-agent price that sell market is substantially more than 1800 yuan.
3. water resistance is good not.The soil-solidified-agent water stability of having constructed can be not, aqua especially, rainwater is long-time cannot fixed foundation soil after soaking.
Therefore, seek high-intensity cheap raw material, seek curing mechanism, improve soil-solidified-agent ultimate compression strength, water resistance, reduction material price, realize utilization of waste material, the convenience degree that improves construction become the task of top priority in the industry.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind ofly can make soil solidification, ultimate compression strength is high and have the soil-solidified-agent of good waterproof and dampproof property, raw material cheapness, and discloses a kind of easy construction, soil solidification method that working efficiency is high.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
Design a kind of soil-solidified-agent, by weight percentage, contain flyash 15～30%, lime 4～15%, water glass 10～20%, caustic soda 8～20%, gypsum 5～16%, ordinary Portland cement 10～32%, fluorite 0.5～3.5%, sodium sulfate 0～1.5%.
Described soil-solidified-agent contains flyash 15～25%, lime 8～12%, water glass 12～18%, caustic soda 12～18%, gypsum 10～15%, ordinary Portland cement 15～25%, fluorite 1.0～2.0%, sodium sulfate 0～1.0%.
Described soil-solidified-agent contains flyash 19%, lime 10%, water glass 16%, caustic soda 16%, gypsum 13%, ordinary Portland cement 23.5%, fluorite 1.5%, sodium sulfate 1.0%.
The specific surface area of described flyash is that the specific surface area of described flyash is 1.70 * 10
4～1.90 * 10
4cm
2/ g.
Described lime at least meets the relevant requirements of tertiary gradient slaked lime in standard GB/T 1594-79.
Described fluorite meets standard GB/T 19321-88.
Utilize above-mentioned soil-solidified-agent to carry out a method for soil solidification, key step comprises:
Standby sub-layer, construction survey, get the raw materials ready, pave, mix, leveling and roller-compaction, initial curing, in described material preparation step, by above-mentioned each raw material of soil-solidified-agent proportioning raw materials preparation soil-solidified-agent; In described mix step, soil moisture content is adjusted to 10～20%, and presses soil-solidified-agent described in the blended ratio mix of 1:14～20.
In described mix step, soil moisture content is preferably adjusted to 15.5%, and presses soil-solidified-agent described in the best blended ratio mix of 1:17.
The present invention has actively useful effect:
(1) in solidifying agent of the present invention, contain exciting agent composition (as caustic soda, sodium sulfate etc.), can make solidifying agent particle and soil particle surface activation, in hydration reaction process, the specific surface area of solidifying agent own increases considerably, and is applicable to solidify the little soil of particle size range; Soil-solidified-agent of the present invention has not only been brought into play hydration reaction and ion exchange in the past, also by exciting the activity of soil itself greatly to improve the ultimate compression strength of solidified earth, and there is good waterproof and dampproof property, through curing soil, there will not be " secondary argillization " phenomenon.
(2) solidify during soil-solidified-agent curing soil of the present invention closely, contraction and the coefficient of expansion are lower, fixed soil body compression deformability is minimum, be difficult for to produce because produced by temperature Change to expand with heat and contract with cold phenomenon to cause distortion to be chapped, therefore solidify impervious, freeze proof, the problem such as resistance to cleavage is good, and while having solved preferably traditional solidify material curing soil, existing water stability is poor, drying shrinkage is large, easy to crack of the soil body.
(3) heat conductivity is atomic.Soil-solidified-agent of the present invention has strong solidifiability and solidification, and coagulation surface is tight, has good heat insulating function and cooling function.
(4) raw materials used nontoxic, harmless, energy-conservation.As a large amount of, used industrial waste-flyash, there is dual energy-saving effect, and itself is nontoxic, for industrial flyash, industrial residue, all can directly use simultaneously.During for sealing hazardous material, objectionable impurities should not be oozed out, and security is good.
(5) soil solidification method easy construction of the present invention, time saving and energy saving, while using solidifying agent, not affected by temperature, and setting time is fast, and working efficiency is high, greatly the reduction of erection time, reduces costs.Use the building site of solidifying agent of the present invention, can gather materials on the spot and not take up space, avoid the vehicle of transporting roach to affect traffic and pollute surrounding environment.
(6) can be applied in the ground surface works such as highway, street, airport for different soil properties, one of them the most widely purposes be exactly the application in road foundation.
(7) under formula condition of the present invention, soil-solidified-agent cost is about 530 yuan/ton, and current conventional soil-solidified-agent market price is greatly about 1800 yuan/ton of left and right.
Accompanying drawing explanation
Fig. 1 is dry density-water content-soil-solidified-agent volume graph of a relation of soil in the present invention.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Related each raw material in following embodiment, if no special instructions, is marketable material.
In embodiment 1～18, the composition of raw materials of soil-solidified-agent is in Table 1, and the index request of main raw material is as follows:
Flyash: the specific surface area of the flyash that dispatches from the factory is 1.85 * 10
4cm
2/ g, its size-grade distribution sees the following form 1.
The size-grade distribution table of table 1 flyash
By flyash and water in mass ratio 4:1 mix after with the wet-milling of pottery grain ball mill.
Lime: with reference to national standard (GB1594-79), use slaked lime, three grades.
Ordinary portland cement: select ordinary Portland cement, wherein each component is as follows: 3CaOSiO
2(46%), 2CaOSiO
2(32%), 3CaOAL
2o
3(12%), 4CaOAl
2o
3fe
2o
3(10%); The cement that dispatches from the factory is crossed 0.080mm round hole sieve, and screen over-size is less than 4%.
Water glass: being commonly called as flower bulb alkali, is a kind of water-soluble silicate, and its aqueous solution is water glass.The water glass adopting is water glass (Na
2onSiO
2) the aqueous solution.
Gypsum: adopt natural dihydrate gypsum (CaSO
42H
2o) be called again plaster stone, through calcining, the levigate beta-type semi-hydrated gypsum (CaSO that obtains
41/2H
2o), i.e. plaster of Paris.
Fluorite (Fluorite), claims again fluorite.According to the fluorite standard GB/T 19321-88 of China's building materials industry, select.
Caustic soda, sodium sulfate are common marketable material.
By above-mentioned various raw materials,, with stirrer, fully stir evenly respectively according to the formula rate blending in table 2 together, stagnate after 5～10 minutes, again stir, place after 12 hours, can use; Also can use gas-impermeable plastics bag bag distribution packaging.Store stand-by, 12 months staging lifes.
In above-mentioned each example, the check of the performance index of soil-solidified-agent is carried out according to the regulation in industry standard soil-solidified-agent CJ/T3073-1998, and its ultimate compression strength index can be reached for 1.80g/cm in Table 1(dry density of soil index
3, optimum moisture content is 15.5%).
Table 2 soil-solidified-agent formula table
Each routine soil-solidified-agent is through laboratory and field test of many times above, and the Main physical index of its curing soil is in Table 3.
The table 3 foundation soil leading indicator that is cured
| Proportion (g/m 3） | Liquid limit % | Plastic limit % | Plasticity index | Soil class |
| （1.69） | 27.8 | 16.2 | 11.6 | Silt～silty loam |
Field trial proves, the soil-solidified-agent in above-mentioned each example can be applied to two, three completely, the solid soil of basic unit of Class IV highway is processed, also can be for the soil solidification of motorway and Class I highway subbase.
embodiment 19:the maximum dry density of soil-solidified-agent and intensity test
(1) soil maximum dry density experiment
1. according to the preparation method of formula and solidifying agent described in embodiment 1, prepare soil-solidified-agent;
2. load weighted solidifying agent is added in the soil test portion after infiltration, with agitator, fully mixes and stirs uniform state, place 12 hours;
3. according to TO804-94 code requirement in JTJ057-94, select heavy test method, by 10%, 12%, 14%, 16%, 18%, 20% water content, prepare soil sample respectively; With instrument, detect the dry density of soil of test block; And put and paint dry density of soil-moisture spirogram, see Fig. 1.
4. by Fig. 1, can find the optimum soil moisture content under maximum dry density of soil, the maximum dry density of soil is 1.80g/cm
3, optimum moisture content is 15.5%.
(2) intensity test
1. take the method for making holes in soil, take out soil test specimen;
The curing earth material quantity of test specimen needs is calculated as follows:
Close the water content (%) of material.
2. test specimen is put on the lifting table of hydropress, carries out resistance to compression mensuration, in mensuration process, should make the deformation rate of test specimen approximately remain 1mm/min, the peak pressure while recording test specimen destruction.
3. ultimate compression strength is calculated
The unconfined compression strength P of solidified earth test specimen calculates with following formula
P?=F/A=?0.00051P（MPa）
In formula: the peak pressure (N) when F refers to test specimen destruction, A refers to the floorage of test specimen, A=π D
2/ 4, D refers to the bottom surface diameter (mm) of test specimen.
4. the results show, the full water ultimate compression strength of solidified earth that coal ash soil soil curing agent incorporation is 8% is 3.66MPa.
By standard, hitting real experimental result can find out, the maximum dry density of solidified earth increases gradually with the increase of curing agent content, when the mixed ratio example of solidifying agent is greater than 1:14, the maximum dry density of solidified earth has obvious growth than the maximum dry density of element soil, progressively increase with mixed ratio example is tending towards a definite value, and its increasing degree is at 0.029～0.049g/cm
3between.
Can find out, when the mixed ratio example of solidifying agent and the soil that is cured is 1:17, the maximum dry density of solidified earth is 1.80g/cm
3, than the maximum dry density (1.75g/cm of element soil
3) raising 0.05g/cm
3, change obviously, to improving native intensity, play fairly obvious effect, thereafter, on a declining curve.Can reach a conclusion thus, the best blending amount of coal ash soil soil curing agent is that 5.88%(is equivalent to 1:17), optimum moisture content is 15.5%, the maximum dry density of soil can reach 1.80g/cm
3.
Although above the present invention is described in detail with a general description of the specific embodiments, on basis of the present invention, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements, all belong to the scope of protection of present invention without departing from theon the basis of the spirit of the present invention.
Claims (8)
1. a soil-solidified-agent, it is characterized in that, by weight percentage, described soil-solidified-agent is comprised of flyash 15～30%, lime 4～15%, water glass 10～20%, caustic soda 8～20%, gypsum 5～16%, ordinary Portland cement 10～32%, fluorite 0.5～3.5% and sodium sulfate 0～1.5%.
2. soil-solidified-agent according to claim 1, it is characterized in that, described soil-solidified-agent is comprised of flyash 15～25%, lime 8～12%, water glass 12～18%, caustic soda 12～18%, gypsum 10～15%, ordinary Portland cement 15～25%, fluorite 1.0～2.0% and sodium sulfate 0～1.0%.
3. soil-solidified-agent according to claim 1, is characterized in that, described soil-solidified-agent is comprised of flyash 19%, lime 10%, water glass 16%, caustic soda 16%, gypsum 13%, ordinary Portland cement 23.5%, fluorite 1.5% and sodium sulfate 1.0%.
4. soil-solidified-agent according to claim 1, is characterized in that, the specific surface area of described flyash is 1.70 * 10
4～1.90 * 10
4cm
2/ g.
5. soil-solidified-agent according to claim 1, is characterized in that, described lime at least meets the relevant requirements of tertiary gradient slaked lime in standard GB/T 1594-79.
6. soil-solidified-agent according to claim 1, is characterized in that, described fluorite meets standard GB/T 19321-88.
7. soil-solidified-agent according to claim 1, it is characterized in that, utilize soil-solidified-agent to carry out the method for soil solidification, key step comprises: standby sub-layer, construction survey, get the raw materials ready, pave, mix, leveling and roller-compaction, initial curing, it is characterized in that, in described material preparation step, by proportioning raw materials claimed in claim 1, prepare each raw material of soil-solidified-agent; In described mix step, soil moisture content is adjusted to 10～20%, and presses the blended ratio mix soil-solidified-agent claimed in claim 1 of 1:14～20.
8. soil-solidified-agent according to claim 7, is characterized in that, in described mix step, soil moisture content is adjusted to 15.5%, and presses soil-solidified-agent described in the blended ratio mix of 1:17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210541752.XA CN103013526B (en) | 2012-12-14 | 2012-12-14 | Soil solidifier and soil solidification method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210541752.XA CN103013526B (en) | 2012-12-14 | 2012-12-14 | Soil solidifier and soil solidification method |
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| Publication Number | Publication Date |
|---|---|
| CN103013526A CN103013526A (en) | 2013-04-03 |
| CN103013526B true CN103013526B (en) | 2014-11-26 |
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| CN105950157A (en) * | 2016-07-27 | 2016-09-21 | 松田勤 | Environment-friendly inorganic soil solidification additive |
| CN106278095A (en) * | 2016-08-11 | 2017-01-04 | 洛阳名力科技开发有限公司 | A kind of soil-solidified-agent |
| CN106520132A (en) * | 2016-10-11 | 2017-03-22 | 常州市鼎升环保科技有限公司 | Method for preparing environment-friendly soil stabilizer |
| CN109305792B (en) * | 2018-08-17 | 2021-03-12 | 水利部交通运输部国家能源局南京水利科学研究院 | Soil curing agent, preparation method and soil curing construction method |
| CN109082279A (en) * | 2018-11-09 | 2018-12-25 | 刘景岳 | A kind of high-effective saline-alkali soil conditioner and preparation method thereof |
| CN109266362B (en) * | 2018-11-09 | 2021-03-23 | 西南科技大学城市学院 | Modifying agent and application thereof |
| CN109555101B (en) * | 2019-01-22 | 2020-08-25 | 淮阴师范学院 | Soil solidification method for sandy foundation field |
| CN111040769B (en) * | 2019-12-17 | 2021-03-23 | 河南省地质环境规划设计院有限公司 | Soil restoration improving agent and soil restoration improving method |
| CN112830758B (en) * | 2021-02-26 | 2022-07-22 | 何旭阳 | Environment-friendly soil stabilizer and preparation method thereof |
| CN113716932A (en) * | 2021-10-15 | 2021-11-30 | 陕西省土地工程建设集团有限责任公司铜川分公司 | Anti-permeability and anti-freeze-thawing composite loess and preparation method thereof |
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| CN101100854A (en) * | 2007-08-06 | 2008-01-09 | 杨毅男 | Environment-friendly type soil solidifying agent |
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