CN103013526A - Soil solidifier and soil solidification method - Google Patents
Soil solidifier and soil solidification method Download PDFInfo
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- CN103013526A CN103013526A CN201210541752XA CN201210541752A CN103013526A CN 103013526 A CN103013526 A CN 103013526A CN 201210541752X A CN201210541752X A CN 201210541752XA CN 201210541752 A CN201210541752 A CN 201210541752A CN 103013526 A CN103013526 A CN 103013526A
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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
The curing of soil is actually with additive carries out the physical chemistry processing to the soil body, changes composition of the soil, changes the engineering properties of the soil body, thereby reaches the purpose that improves soil strength, improves the soil property compactibility.The coal ash soil soil curing agent is as main take flyash; by multiple inorganic and organic materials, through after the rational Match, formulated hydraulic cementing materials; belong to a kind of New Building Materials, at normal temperatures direct binder soil soil particle or can generate gum material with clay mineral reaction.
20 beginnings of the century, some developed countries are owing to build the needs of the engineerings such as road, harbour, adopt lime, cement to soil improvement, first stage of construction has been obtained preferably 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, do not satisfy the engineering construction development need.Therefore, it is stable to seek soil solidification, and water stability is good, and convergent-divergent is little, and is nontoxic, energy-conservation, and the soil curing material of the characteristics 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 at present is 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 greater than 3MPa(CJJ/T801998).The soil-solidified-agent that has been applied at present in the highway construction can only remedy intensity by increasing incorporation.
2. expensive.China domestic soil-solidified-agent manufacturer seldom only has Beijing, several the production units in Tianjin, and is a large amount of by from the U.S., Japan, Australian import, greatly increased cost.The soil-solidified-agent price that sell the market is basically 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 can't fixed foundation soil after soaking.
Therefore, seek high-intensity cheap raw material, seek curing mechanism, the convenience degree of the ultimate compression strength of raising soil-solidified-agent, water resistance, reduction material price, realization utilization of waste material, raising construction has become the task of top priority in the industry.
Summary of the invention
It is high and have the preferably soil-solidified-agent of waterproof and dampproof property, raw material cheapness that the technical problem to be solved in the present invention provides a kind of soil solidification, ultimate compression strength of making, and disclose the soil solidification method of a kind of easy construction, high efficiency.
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 satisfies the relevant requirements of tertiary gradient slaked lime among the standard GB/T 1594-79 at least.
Described fluorite meets standard GB/T 19321-88.
A kind of method of utilizing above-mentioned soil-solidified-agent to carry out 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 the described soil-solidified-agent of blended ratio mix of 1:14～20.
In described mix step, soil moisture content preferably is adjusted to 15.5%, and presses the described soil-solidified-agent of best blended ratio mix of 1:17.
The present invention has actively useful effect:
(1) contains the exciting agent composition in the solidifying agent of the present invention (such as caustic soda, sodium sulfate etc.), can make solidifying agent particle and soil particle surface activation, in the 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 greatly improved the ultimate compression strength of solidified earth by the activity that excites soil itself, and have preferably waterproof and dampproof property, " secondary argillization " phenomenon can not appear in the soil through solidifying.
(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 existing water stability is poor when having solved preferably traditional solidify material curing soil, 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 preferably heat insulating function and cooling function.
(4) raw materials used nontoxic, harmless, energy-conservation.Such as a large amount of industrial waste-flyash that used, have dual energy-saving effect, and itself is nontoxic, all can directly use for industrial flyash, industrial residue simultaneously.When being used for the sealing hazardous material, objectionable impurities should not be oozed out, and security is good.
(5) soil solidification method easy construction of the present invention is time saving and energy saving, not affected by temperature when using solidifying agent, and setting time is fast, and high efficiency greatly the reduction of erection time, reduces cost.Use the building site of solidifying agent of the present invention, can gather materials on the spot does not take up space, and the vehicle of avoiding transporting roach affects traffic and pollutes 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 application in road foundation.
(7) under the prescription condition of the present invention, the soil-solidified-agent cost is about 530 yuan/tons, and present conventional soil-solidified-agent market price is greatly about about 1800 yuan/tons.
Description of drawings
Fig. 1 is the dry density-water content-soil-solidified-agent volume graph of a relation of soil among the present invention.
Embodiment
Further set forth the present invention below in conjunction with specific embodiment.Related each raw material among the following embodiment if no special instructions, is marketable material.
The composition of raw materials of soil-solidified-agent sees Table 1 among the embodiment 1～18, 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
Use the wet-milling of pottery grain ball mill after 4:1 mixes in mass ratio with water with flyash.
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 the 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 that adopts 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 gets
41/2H
2O), i.e. plaster of Paris.
Fluorite (Fluorite) claims again fluorite.Fluorite standard GB/T 19321-88 according to China's building materials industry selects.
Caustic soda, sodium sulfate are common marketable material.
With above-mentioned various raw materials,, fully stir evenly with stirrer respectively according to the blending of the formula rate in the 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.
The check of the performance index of soil-solidified-agent is carried out according to the regulation among the industry standard soil-solidified-agent CJ/T3073-1998 in above-mentioned each example, and its ultimate compression strength index sees Table 1(dry density of soil index can be reached for 1.80g/cm
3, optimum moisture content is 15.5%).
Table 2 soil-solidified-agent formula table
More than each routine soil-solidified-agent through laboratory and open-air test of many times, the Main physical index of its curing soil sees 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 fully, the solid soil of basic unit of Class IV highway is processed, and also can be used 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 embodiment 1 described prescription and solidifying agent, prepare soil-solidified-agent;
2. load weighted solidifying agent is added in the soil test portion after the infiltration, fully mixes and stirs uniform state with agitator, placed 12 hours;
3. according to TO804-94 code requirement among the JTJ057-94, select heavy test method, prepare soil sample by 10%, 12%, 14%, 16%, 18%, 20% water content respectively; Detect the dry density of soil of test block with instrument; And put and paint dry density of soil-moisture spirogram, see Fig. 1.
4. can find optimum soil moisture content under the maximum dry density of soil by Fig. 1, 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 the 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 and measure, in the mensuration process, should make the deformation rate of test specimen remain approximately 1mm/min, the peak pressure when the record test specimen destroys.
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 the 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, coal ash soil soil curing agent incorporation are that 8% the full water ultimate compression strength of solidified earth is 3.66MPa.
Hitting real experimental result by standard 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 during 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 the mixed ratio example is tending towards a definite value, and its increasing degree is at 0.029～0.049g/cm
3Between.
Can find out that when solidifying agent was 1:17 with the mixed ratio of the soil that is cured is routine, the maximum dry density of solidified earth was 1.80g/cm
3, than the maximum dry density (1.75g/cm of element soil
3) raising 0.05g/cm
3, change apparent in view, to improve soil 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. soil-solidified-agent, it is characterized in that, 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%.
2. soil-solidified-agent according to claim 1, it is characterized in that 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%.
3. soil-solidified-agent according to claim 1 is characterized in that, 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%.
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 satisfies the relevant requirements of tertiary gradient slaked lime among the standard GB/T 1594-79 at least.
6. soil-solidified-agent according to claim 1 is characterized in that, described fluorite meets standard GB/T 19321-88.
7. the method for a 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, prepare each raw material of soil-solidified-agent by proportioning raw materials claimed in claim 1; 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. the method for soil solidification according to claim 1 is characterized in that, in described mix step, soil moisture content is adjusted to 15.5%, and presses the described soil-solidified-agent of blended ratio mix of 1:17.
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|---|---|---|---|
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| CN103013526B CN103013526B (en) | 2014-11-26 |
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| CN103964809A (en) * | 2014-04-21 | 2014-08-06 | 浙江省水利河口研究院 | Curing agent for hydraulic filling of marine mud and curing method thereof |
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| CN105174872A (en) * | 2015-09-18 | 2015-12-23 | 广西路佳道桥勘察设计有限公司 | High-strength soil stabilizer and preparing method thereof |
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| CN105219396A (en) * | 2015-09-18 | 2016-01-06 | 广西路佳道桥勘察设计有限公司 | A kind of soil-solidified-agent and preparation method thereof |
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| CN103964809A (en) * | 2014-04-21 | 2014-08-06 | 浙江省水利河口研究院 | Curing agent for hydraulic filling of marine mud and curing method thereof |
| CN105154098A (en) * | 2015-08-28 | 2015-12-16 | 黄梁艳 | Soil stabilizer |
| CN105174872A (en) * | 2015-09-18 | 2015-12-23 | 广西路佳道桥勘察设计有限公司 | High-strength soil stabilizer and preparing method thereof |
| CN105174881A (en) * | 2015-09-18 | 2015-12-23 | 广西路佳道桥勘察设计有限公司 | Efficient soil stabilizer and preparing method thereof |
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| 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 |
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| CN109082279A (en) * | 2018-11-09 | 2018-12-25 | 刘景岳 | A kind of high-effective saline-alkali soil conditioner and preparation method thereof |
| CN109266362A (en) * | 2018-11-09 | 2019-01-25 | 西南科技大学城市学院 | A kind of modifying agent and its application |
| CN109555101A (en) * | 2019-01-22 | 2019-04-02 | 淮阴师范学院 | A kind of soil solidification method of sandy soil layer |
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