CN111116157B - Silt solidified soil in coastal region, preparation method and application - Google Patents
Silt solidified soil in coastal region, preparation method and application Download PDFInfo
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- CN111116157B CN111116157B CN201911328837.8A CN201911328837A CN111116157B CN 111116157 B CN111116157 B CN 111116157B CN 201911328837 A CN201911328837 A CN 201911328837A CN 111116157 B CN111116157 B CN 111116157B
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- 239000002689 soil Substances 0.000 title claims abstract description 98
- 238000002360 preparation method Methods 0.000 title claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 44
- 239000004568 cement Substances 0.000 claims abstract description 41
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 40
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 40
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 40
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 40
- 239000004571 lime Substances 0.000 claims abstract description 40
- 239000002131 composite material Substances 0.000 claims abstract description 29
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 22
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 22
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 22
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 20
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 20
- 239000001110 calcium chloride Substances 0.000 claims abstract description 20
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 239000000654 additive Substances 0.000 claims abstract description 15
- 238000005056 compaction Methods 0.000 claims abstract description 13
- 230000000996 additive effect Effects 0.000 claims abstract description 12
- 239000002699 waste material Substances 0.000 claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 3
- 238000001723 curing Methods 0.000 claims description 83
- 238000002156 mixing Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 239000004566 building material Substances 0.000 claims description 3
- 239000004746 geotextile Substances 0.000 claims description 3
- 238000010348 incorporation Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 10
- 238000005336 cracking Methods 0.000 abstract description 5
- 150000003839 salts Chemical class 0.000 abstract description 2
- 238000007654 immersion Methods 0.000 description 15
- 238000012360 testing method Methods 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000003776 cleavage reaction Methods 0.000 description 5
- 230000007017 scission Effects 0.000 description 5
- 238000005303 weighing Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 159000000007 calcium salts Chemical class 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 159000000003 magnesium salts Chemical class 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 159000000000 sodium salts Chemical class 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses silty soil solidified soil for coastal areas, which is formed by rolling and pressing waste silty soil, an inorganic composite curing agent and water in the coastal areas. Wherein the inorganic composite curing agent accounts for 1-10% of the dry mass of the silt, and the addition amount of water is added according to the optimal water content of the curing soil mixture. The degree of compaction is controlled to be not less than 93%. The inorganic composite curing agent consists of 85-95% of main curing agent and 5-15% of additive by mass percent; wherein the main curing agent consists of 30 to 70 percent of cement and 30 to 70 percent of lime; the additive is composed of 20-40% of polyaluminium chloride, 20-40% of polyferric chloride, 10-30% of active magnesium oxide, 10-30% of calcium sulfate, 5-30% of calcium chloride and 5-30% of calcium carbonate. The silt solidified soil for the coastal areas is prepared by adopting an efficient inorganic composite curing agent formula, so that the compressive strength, the water stability and the cracking resistance of the silt for the coastal areas can be effectively improved, the problem that the curing effect of the traditional cement and lime on the silt for the coastal areas with higher salt content is poor is solved, and the obtained silt solidified soil can be used for roadbed filling, base course and subbase building.
Description
Technical Field
The invention relates to silty soil solidified soil in a coastal region, a preparation method and application thereof, and belongs to the field of road engineering.
Background
At present, environmental and mine resource protection is highly valued all over the country, the existing stone mines are continuously closed, and the sources of slag generated during road construction and stone of cement-stabilized macadam are increasingly insufficient. On the other hand, with the development of social economy and urban construction, earthwork such as building spoil is increasing and the volume is huge, and the problem that the coming-out of the building spoil becomes the outstanding problem of environmental protection is solved. In order to solve the problems, a feasible, efficient and economic method is provided by adopting a soil solidification technology. The soil solidifying technology is that a certain amount of solidifying agent is added into soil, and the soil body is rolled, formed and maintained to meet the requirements of engineering application performance.
At present, more solidifying materials are mainly traditional inorganic materials, such as cement, lime and the like. However, both cement soil and lime soil have certain disadvantages, such as easy cracking of cement soil, poor water stability of lime soil, low early strength and the like. The most outstanding problems are that the cement and lime have high requirements on soil, the application range is narrow, and the curing effect on saline soil, expansive soil, mucky soil and silt soil with high salt content is poor or even no effect. In coastal areas, a large amount of waste building silt exists, the waste building silt has the characteristics of poor adhesive property, easiness in softening in water, difficulty in compacting, poor scouring resistance and the like, and a certain amount of sodium salt is contained due to the corrosion action of seawater, so that the waste building silt is difficult to cure by adopting a traditional inorganic curing agent to meet the engineering performance requirement.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
In view of the above, the invention provides silt solidified soil in coastal areas, a preparation method and application. After the silt solidified soil in the coastal areas is solidified by the high-efficiency inorganic composite curing agent, the waste silt can meet the performance requirements of road subgrade filling and base layer and subbase layer building, the current situation of road building material shortage can be relieved, the randomly-piled construction waste silt can be recycled, and the win-win situation of environment and economy is realized.
The purpose of the invention is realized by the following technical scheme:
a silt solidified soil for coastal areas is prepared from waste silt, inorganic composite solidifying agent and water through mixing, rolling and shaping. Wherein the inorganic composite curing agent accounts for 1-10% of the dry mass of the silt, and the adding mass of the water accounts for 8-18% of the dry mass of the curing soil. The degree of compaction is controlled to be not less than 93%. The inorganic composite curing agent consists of 85-95% of main curing agent and 5-15% of additive by mass percent; wherein the main curing agent consists of 30 to 70 percent of cement and 30 to 70 percent of lime; the additive consists of 20 to 40 percent of polyaluminium chloride, 20 to 40 percent of polyferric chloride, 10 to 30 percent of active magnesium oxide, 10 to 30 percent of calcium sulfate, 5 to 30 percent of calcium chloride and 5 to 30 percent of calcium carbonate.
Further, the inorganic composite curing agent is prepared from the following raw materials in percentage by mass: 40% of cement, 48% of lime, 3% of polyaluminium chloride, 2% of polyferric chloride, 2% of active magnesium oxide, 2% of calcium sulfate, 1% of calcium chloride and 2% of calcium carbonate.
Further, the inorganic composite curing agent is prepared from the following raw materials in percentage by mass: 30% of cement, 55% of lime, 4% of polyaluminium chloride, 3% of polyferric chloride, 2% of active magnesium oxide, 3% of calcium sulfate, 1.5% of calcium chloride and 1.5% of calcium carbonate.
Further, the added mass m of waterWater (W)＝(mSoil for soil+mCuring agent)×ω0Wherein m isWater (W)Is the added mass of water, mSoil for soilM is the dry mass of siltCuring agentFor dry mass incorporation of curing agents, omega0The optimum water content for the solidified soil.
A preparation method of the silt solidified soil in the coastal region comprises the following steps:
(1) the main curing agent is prepared by uniformly mixing the cement and the lime according to the proportion.
(2) The polyaluminium chloride, the polyferric chloride, the active magnesium oxide, the calcium sulfate, the calcium chloride and the calcium carbonate are uniformly mixed according to the proportion to form the additive.
(3) And (3) uniformly mixing the main curing agent prepared in the step (1) and the additive prepared in the step (2) according to a proportion to prepare the inorganic composite curing agent.
(4) And (3) uniformly mixing the waste silt in the coastal region, the inorganic composite curing agent prepared in the step (3) and water, wherein the mixing amount of the inorganic composite curing agent is 1-10% of the dry mass of the silt, and the adding mass of the water is 8-18% of the dry mass of the silt. And (3) filling the uniformly mixed mixture into a mold, compacting, wherein the degree of compaction is not less than 93%, and demolding and curing.
Further, in the step (4), the curing method comprises covering the geotextile, and watering for curing for 3-7 days.
The application of the silt solidified soil for the coastal areas is that the silt solidified soil for the coastal areas is used as a roadbed filling material and a base layer and subbase layer building material.
The invention has the beneficial effects that:
the silt solidified soil in the coastal region provided by the invention is prepared by solidifying an inorganic composite curing agent: compared with the traditional cement lime solidified silt in coastal areas, the silt solidified soil in coastal areas provided by the invention has the advantages of high compressive strength, good water stability and obvious cracking resistanceThe method has the characteristics of promotion and the like, can well meet the performance requirements of road subgrade filling, base layers and subbase layers, and effectively solves the key technical problem of resource utilization of silt in coastal areas. The inorganic composite curing agent adopted by the curing soil has the following characteristics: by adopting high-efficiency additives and through the excitation and surface modification effects of the additives, the problem that the silt in coastal areas is not easily solidified by cement lime can be effectively solved. The key technology is as follows: the additive contains inorganic high molecular polymer, such as polyaluminium chloride and polyferric chloride, in a certain proportion. By ion exchange reaction, inorganic high molecular polymer (Al)3+、Fe3+) With low-valent cations (K) abundantly present in the silt+、Na+) And efficient replacement reaction is carried out, so that the thickness of the soil double-electrode layer is effectively reduced, the content of sodium salt in the soil is reduced, and the volcanic ash reaction of cement lime is promoted to be effectively carried out. Meanwhile, the inorganic high molecular polymer also has a surface modification effect, so that the hydrophilicity of the soil surface is weakened, the hydrophobic property is enhanced, and the water stability of the solidified soil is effectively enhanced. The additive also contains calcium salt and magnesium salt in a certain proportion, and the calcium salt and the magnesium salt can effectively enhance the chemical reaction between the cement lime and the soil. The active magnesium oxide and the calcium sulfate have a micro-expansion effect, and the active magnesium oxide and the calcium sulfate can achieve a double-expansion effect together by blending in a proper proportion, namely the calcium sulfate can promote the generation of ettringite, and the early expansion effect is good; the active magnesium oxide has slow expansion characteristic and can effectively promote later expansion. The two interact to form the best micro-expansion effect, reduce the internal pores of the solidified soil and enhance the compactness of the soil body, thereby enhancing the water stability and the cracking performance of the solidified soil. The calcium chloride and the calcium carbonate also have the capacity of promoting ion exchange, and can promote the carbonation reaction and the hardening reaction of the cement lime. The additives have the capability of mutual promotion of interaction, so that the solidified soil has better compressive strength, water stability and cracking resistance.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived from the embodiments of the present invention by a person of ordinary skill in the art are within the scope of the present invention.
Example 1
Preparation of the curing agent: weighing 4kg of cement, 5kg of lime, 0.3kg of polyaluminium chloride, 0.2kg of polyferric chloride, 0.10kg of active magnesium oxide, 0.20kg of calcium sulfate, 0.05kg of calcium chloride and 0.15kg of calcium carbonate. Firstly, cement lime is evenly mixed, then, polyaluminium chloride, polyferric chloride, active magnesium oxide, calcium sulfate, calcium chloride and calcium carbonate are evenly mixed, and finally, the cement lime mixture and the admixture mixture are evenly mixed to obtain the composite inorganic curing agent.
Preparing soil solidified soil: the solidified soil is prepared by the obtained solidifying agent. The mixing amount of the curing agent is 5 percent. Firstly, compaction tests are carried out according to the formula to determine the optimal water content and the maximum dry density, and the optimal water content is measured to be 12%. And then 5kg of silt, 0.25kg of the prepared composite inorganic curing agent and 0.63kg of water are weighed, uniformly mixed and filled into a mold. And then compacting, wherein the degree of compaction is 95%, ensuring 2 minutes, demoulding, putting into a standard curing room for curing, taking out for testing when the curing is at the age. The test contents include 7 days, 28 days of water immersion and no water immersion unconfined compressive strength and 28 days of water immersion cleavage strength.
Example 2
Preparation of the curing agent: weighing 5kg of cement, 4kg of lime, 0.2kg of polyaluminium chloride, 0.3kg of polyferric chloride, 0.15kg of active magnesium oxide, 0.10kg of calcium sulfate, 0.3kg of calcium chloride and 0.05kg of calcium carbonate. Firstly, cement lime is evenly mixed, then, polyaluminium chloride, polyferric chloride, active magnesium oxide, calcium sulfate, calcium chloride and calcium carbonate are evenly mixed, and finally, the cement lime mixture and the admixture mixture are evenly mixed to obtain the composite inorganic curing agent.
Preparing soil solidified soil: the solidified soil is prepared by the obtained solidifying agent. Then 5kg of silt is weighed, and the mixing amount of the curing agent is 3 percent, namely 0.15kg of the curing agent prepared by the method is weighed. The added mass of water is 0.5kg, and the mixture is evenly mixed and put into a die. And then compacting, wherein the degree of compaction is 93%, ensuring for 2 minutes, demoulding, putting into a standard curing room for curing, taking out for testing when the curing is at the age. The test contents include 7 days, 28 days of water immersion and no water immersion unconfined compressive strength and 28 days of water immersion cleavage strength.
Example 3
Preparation of the curing agent: weighing 4kg of cement, 4.8kg of lime, 0.3kg of polyaluminium chloride, 0.2kg of polyferric chloride, 0.2kg of active magnesium oxide, 0.3kg of calcium sulfate, 0.1kg of calcium chloride and 0.2kg of calcium carbonate. Firstly, cement lime is evenly mixed, then, polyaluminium chloride, polyferric chloride, active magnesium oxide, calcium sulfate, calcium chloride and calcium carbonate are evenly mixed, and finally, the cement lime mixture and the admixture mixture are evenly mixed to obtain the composite inorganic curing agent.
Preparing soil solidified soil: the solidified soil is prepared by the obtained solidifying agent. The mixing amount of the curing agent is 10 percent. Firstly, the optimum water content and the maximum dry density are determined according to the formula by a compaction test. Then 5kg of silt and 0.5kg of curing agent prepared in the above are weighed. The added mass of water is 0.8kg, and the mixture is evenly mixed and put into a die. And then compacting, wherein the degree of compaction is 95%, carrying for 2 minutes, demoulding, putting into a standard curing room for curing, taking out for testing when the curing is at the age. The test contents include 7 days, 28 days of water immersion and no water immersion unconfined compressive strength and 28 days of water immersion cleavage strength.
Example 4
Preparation of the curing agent: 3kg of cement, 5.5kg of lime, 0.4kg of polyaluminium chloride, 0.3kg of polyferric chloride, 0.2kg of active magnesium oxide, 0.3kg of calcium sulfate, 0.15kg of calcium chloride and 0.15kg of calcium carbonate are weighed. Firstly, cement lime is evenly mixed, then, polyaluminium chloride, polyferric chloride, active magnesium oxide, calcium sulfate, calcium chloride and calcium carbonate are evenly mixed, and finally, the cement lime mixture and the admixture mixture are evenly mixed to obtain the composite inorganic curing agent.
Preparing soil solidified soil: the solidified soil is prepared by the obtained solidifying agent. The mixing amount of the curing agent is 10 percent. Firstly, compaction tests are carried out according to the formula to determine the optimal water content and the maximum dry density, and the optimal water content is 14 percent. Then 5kg of silt and 0.5kg of curing agent prepared in the above are weighed. The added mass of water is 0.8kg, and the mixture is evenly mixed and put into a die. Then compacting, keeping the compactness at 97%, carrying for 2 minutes, demoulding, putting into a standard curing room for curing, taking out for testing when the curing is at the age. The test contents include 7 days, 28 days of water immersion and no water immersion unconfined compressive strength and 28 days of water immersion cleavage strength.
Example 5
Preparation of the curing agent: weighing 5.5k g kg of cement, 3kg of lime, 0.35kg of polyaluminium chloride, 0.40kg of polyferric chloride, 0.3kg of active magnesium oxide, 0.2kg of calcium sulfate, 0.05kg of calcium chloride and 0.3kg of calcium carbonate. Firstly, cement lime is evenly mixed, then, polyaluminium chloride, polyferric chloride, active magnesium oxide, calcium sulfate, calcium chloride and calcium carbonate are evenly mixed, and finally, the cement lime mixture and the admixture mixture are evenly mixed to obtain the composite inorganic curing agent.
Preparing soil solidified soil: the solidified soil is prepared by the obtained solidifying agent. The mixing amount of the curing agent is 5 percent. Firstly, compaction tests are carried out according to the formula to determine the optimal water content and the maximum dry density, and the optimal water content is measured to be 13%. Then 5kg of silt and 0.25kg of curing agent prepared in the above are weighed. The added mass of water is 0.68kg, and the mixture is evenly mixed and put into a die. Then compacting, keeping the compactness at 97%, carrying for 2 minutes, demoulding, putting into a standard curing room for curing, taking out for testing when the curing is at the age. The test contents include 7 days, 28 days of water immersion and no water immersion unconfined compressive strength and 28 days of water immersion cleavage strength.
Comparative example:
the original soil was used as a control group 1; taking cement soil obtained by adding cement with 5% of the mass of silt and solidifying as a control group 2; taking limestone soil prepared by adding lime with 5 percent of the mass of the silt soil and solidifying as a control group 3; the preparation process of the cement soil and the lime soil is consistent with the operation flow in the embodiment 2, the degree of compaction is controlled to be 95%, the mass of the added water is added according to the optimal water content of the solidified soil, and the curing conditions are also the same.
And (3) comparing and analyzing different solidified soils: the engineering properties of the solidified soils prepared in the above examples and comparative examples were compared.
TABLE 1 comparison of engineering properties of different firmed soils
In analytical table 1, the original soil, the soil cement, the soil lime and the soil hardened according to the present invention are compared. The indexes such as unconfined compressive strength, splitting strength, water stability coefficient and the like obviously show that the compressive strength, the crack resistance and the water stability of the solidified soil are obviously better than those of the traditional cement soil and lime soil.
For practical application, the curing method of the solidified soil can adopt covering geotextile, and watering for curing for 3-7 days.
In conclusion, by adopting the reasonable curing agent formula, the high-strength concrete disclosed by the invention has the advantages of high compressive strength, good water stability and excellent crack resistance; compared with the traditional inorganic materials such as cement, lime and the like, the material has better performance, economic and environmental benefits, can also solve some special problems which are difficult to solve when the cement and lime are used for soil reinforcement, particularly has unique soil solidification effect and engineering application value to silt in coastal areas, and can be widely used in the fields of highway subgrade filling, base course and subbase building, building foundation treatment and the like.
Claims (7)
1. The silty soil solidified soil for the coastal areas is characterized by being formed by mixing, rolling and molding waste silty soil for the coastal areas, an inorganic composite curing agent and water; wherein, the inorganic composite curing agent accounts for 1-10% of the dry mass of the silt, and the adding mass of the water accounts for 8-18% of the dry mass of the curing soil; the degree of compaction is controlled to be not less than 93 percent; the inorganic composite curing agent consists of 85-95% of main curing agent and 5-15% of additive by mass percent; wherein the main curing agent consists of 30 to 70 percent of cement and 30 to 70 percent of lime; the additive consists of 20 to 40 percent of polyaluminium chloride, 20 to 40 percent of polyferric chloride, 10 to 30 percent of active magnesium oxide, 10 to 30 percent of calcium sulfate, 5 to 30 percent of calcium chloride and 5 to 30 percent of calcium carbonate.
2. The silt solidified soil for coastal areas according to claim 1, wherein the inorganic composite curing agent is prepared from the following raw materials in percentage by mass: 40% of cement, 48% of lime, 3% of polyaluminium chloride, 2% of polyferric chloride, 2% of active magnesium oxide, 2% of calcium sulfate, 1% of calcium chloride and 2% of calcium carbonate.
3. The silt solidified soil for coastal areas according to claim 1, wherein the inorganic composite curing agent is prepared from the following raw materials in percentage by mass: 30% of cement, 55% of lime, 4% of polyaluminium chloride, 3% of polyferric chloride, 2% of active magnesium oxide, 3% of calcium sulfate, 1.5% of calcium chloride and 1.5% of calcium carbonate.
4. The silt solidified soil for coastal areas according to any one of claims 1 to 3, wherein the added mass m of water isWater (W)＝(mSoil for soil+mCuring agent)×ω0Wherein m isWater (W)Is the added mass of water, mSoil for soilM is the dry mass of siltCuring agentFor incorporation of curing agent dry mass, omega0The optimum water content for the solidified soil.
5. The method for preparing the silt solidified soil for the coastal areas as claimed in claim 1, which comprises the following steps:
(1) uniformly mixing cement and lime according to a proportion to prepare a main curing agent;
(2) uniformly mixing polyaluminium chloride, polyferric chloride, active magnesium oxide, calcium sulfate, calcium chloride and calcium carbonate according to a proportion to form an additive;
(3) uniformly mixing the main curing agent prepared in the step (1) and the additive prepared in the step (2) according to a proportion to prepare an inorganic composite curing agent;
(4) uniformly mixing the waste silt in the coastal region, the inorganic composite curing agent prepared in the step (3) and water, wherein the mixing amount of the inorganic composite curing agent is 1-10% of the dry mass of the silt, and the adding mass of the water is 8-18% of the dry mass of the curing soil; and (3) filling the uniformly mixed mixture into a mold, compacting, wherein the degree of compaction is not less than 93%, and demolding and curing.
6. The preparation method according to claim 5, wherein in the step (4), the curing method is covering geotextile, and the watering curing is performed for 3-7 days.
7. The use of the silt solidified soil for coastal areas according to claim 1, wherein the silt solidified soil for coastal areas is used as a roadbed filling material and a base layer and a subbase layer building material.
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| CN201911328837.8A CN111116157B (en) | 2019-12-20 | 2019-12-20 | Silt solidified soil in coastal region, preparation method and application |
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| CN201911328837.8A CN111116157B (en) | 2019-12-20 | 2019-12-20 | Silt solidified soil in coastal region, preparation method and application |
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| CN113652239B (en) * | 2021-08-10 | 2022-07-26 | 中建三局第二建设工程有限责任公司 | Special curing agent for tropical desert soil and use method thereof |
| CN114181710B (en) * | 2021-12-28 | 2024-01-09 | 中国科学院烟台海岸带研究所 | Saline-alkali soil curing agent and preparation method thereof |
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