CN103613351A - Preparation method of solidified salinized soil - Google Patents
Preparation method of solidified salinized soil Download PDFInfo
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- CN103613351A CN103613351A CN201310687986.XA CN201310687986A CN103613351A CN 103613351 A CN103613351 A CN 103613351A CN 201310687986 A CN201310687986 A CN 201310687986A CN 103613351 A CN103613351 A CN 103613351A
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- saline soil
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- saline
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Abstract
The invention relates to a preparation method of solidified salinized soil. The preparation method is characterized by comprising the steps of uniformly mixing one or more compositions of mineral powder containing active aluminum and silicon and having potential hydraulicity or volcanic ash character and active magnesium oxide or active magnesium oxide and lime composition with salinized soil with salt content of 0.5 to 20 percent and water content of 20 and 150 percent according to the mass percentage of (3.5% - 28.5%): (0.5% -10.5%): (70% - 95%), molding according to a design process, and obtaining the solidified salinized soil with the strength and duration meeting the engineering requirements. The prepared solidified salinized soil can be used for constructing a road foundation or a simple road, filling foundation and producing the solidified salinized soil column in the soil.
Description
(1) technical field:
The present invention relates to a kind of curing saline soil preparation method that saline soil solidifies that is applicable to, belong to civil engineering groundwork process field.
(2) background technology:
In ground, soluble salt content reaches more than 0.3%, and has and moltenly fall into, during the engineering characteristic such as salt is swollen, corrosion, claim that this ground is saline soil.Due to its physics and chemistry and mechanical property and general ground totally different, in engineering geology and ground foundation engineering field, be listed in special soils.Saline soil has on a large scale and distributes in China, now along with the fast development of China's economy, the deep propelling of the coastal strategy of country and strategy to develop western regions, increasing foundation works construction is positioned at saline soil area, runs into brining ground foundation processing problem also more and more in engineering.
Adopting solidifying agent to be cured processing to foundation soil is conventional foundation treatment technology, but higher owing to containing multiple salinity and saltiness in saline soil, uses the effect of the curing saline soil of conventional solidifying agent undesirable.For example: the most frequently used solidifying agent---cement, its hydrated product that solidified earth intensity is played a major role is mainly hydrated calcium silicate (CSH), a large amount of vitriol existing, villaumite, carbonate etc. in saline soil, have a strong impact on generation and the stable existence of CSH, cause Cement-Stabilized Saline Soil intensity very low.Due to long-term a large amount of existence of the salt ion in soil, the salt erodibility endurance of Cement-Stabilized Saline Soil is very weak, therefore utilizes Cement-Stabilized Saline Soil, is difficult to guarantee solidified earth intensity and is difficult to meet project durability requirement simultaneously.And existing other soil-solidified-agent provides the hydrated product of solidified earth intensity to be still mainly CSH, so all there is above-mentioned problem of solidification.
(3) summary of the invention:
Applicant's research shows: utilize slag and active oxidation magnesium hardener saline soil, slag, activated magnesia are containing Na
+, K
+, Ca
2+, Mg
2+, Cl
-, SO
4 2-, CO
3 2-etc. in the salt marsh environment of several or multiple salt ion can with saline soil in part salt generate a large amount of new hydrate Mg
6al
2(OH)
16cO
34H
2o (HT) and Ca
4al
2o
6cl
210H
2o (Fs), these two kinds of new hydrates are as the main contributions person of solidifying saline soil intensity, and the comparable cement solidification soil of solidified earth intensity intensity improves 1-4 doubly, and solidified earth has good water stability and salt erodibility endurance.Be different from hydrated product CSH, HT and Fs are that in slag, activated magnesia and soil, reactant salt generates, saline soil environment is beneficial to two kinds of hydrates and generates and stable existence, solidified earth intensity stabilization and solidified earth itself possess very strong salt tolerant erosion ability, therefore utilize slag and active oxidation magnesium hardener saline soil to become one of curing effective way of saline soil.
The object of this invention is to provide a kind of curing saline soil preparation method that saline soil solidifies that is applicable to, make this curing saline soil possess enough intensity, water stability and salt erodibility endurance.
A kind of curing saline soil preparation method of the present invention, is characterized in that: after component (I), component (II) are mixed in the ratio of design with saline soil, by design technology moulding, obtain the curing saline soil of intensity and weather resistance engineering demands.
Described component (I) is slag or slag and one or more compositions containing the mineral dust with latent hydraulicity or volcanic ash character of active silica-alumina, and wherein the mass percent of slag accounts for 70～100%; Described component (II) is activated magnesia or activated magnesia and lime composition, and wherein the mass percent of activated magnesia ratio accounts for 50～100%; Described saline soil refers to that saltiness is the saline soil of 0.5%-30%, comprises chlorine saline soil, Restrain Method of Sulphate Salty soil, and carbonic acid saline soil, sub-chlorine saline soil and sulfurous acid salt marsh soil, saline soil water content is 15%～150%.
Wherein, in component (I), containing the waste residue with latent hydraulicity or volcanic ash character of active silica-alumina, include but not limited to slag, calcining coal gangue, ferro-alloy cinder, non-ferrous metal lime-ash, phosphorus slag, lithium slag, downflow sludge calcination ash, volcanic ash, silicon ash.
Wherein, the activated magnesia described in component (II), can be the light-burned preparation of rhombspar or magnesite or bittern-ammonia process precipitation calcining preparation; Lime can be unslaked lime, white lime or both combinations.
The curing concrete preparation technology of saline soil of the present invention is as follows:
(1) component (I), component (II) are dried, respectively levigate to specific surface area be 250m
2/ kg-600m
2/ kg.
(2) according to saline soil physics-chem characteristic, saltiness, saliferous kind and ratio and solidified earth target strength, determine the mass percent of component (I), component (II) and saline soil, component (I): component (II): saline soil=3.5%～28.5%:0.5%～10.5%:70%～95%.
(3), for different engineering purposes, can adopt following four kinds of modes to make curing saline soil:
A) the oven dry powder of component (I), component (II) is mixed, saline soil water content is adjusted near optimum moisture content, with known machinery, with technique, component (I), component (II) are uniformly mixed into curing saline soil with saline soil, to solidify saline soil and pave and roll near its maximum dry density, for roadbed or low-cost road engineering.
B) the oven dry powder of component (I), component (II) is mixed, saline soil water content is adjusted near optimum moisture content, with known machinery, with technique, component (I), component (II) are uniformly mixed into curing saline soil with saline soil, adopt again known machinery and technique, in soil, by design requirements, make the hole of certain diameter and the degree of depth, to solidify saline soil is progressively filled in hole, employing simultaneously rams or static pressure method will solidify saline soil density near its maximum dry density, forms curing saline soil cylinder in soil.
C) adopt known machinery and technique, for example deep mixer, rotary jetting apparatus, powder spray machine, the original position saline soil at projected depth place in the powder being mixed to form with component (I), component (II) or slurry and ground is stirred, promote while stirring, form curing salt marsh post in soil.
D) adopt known machinery and technique, the powder being mixed to form or slurry and saline soil are stirred, for filled foundation with component (I), component (II).
Near optimum moisture content of the present invention, near maximum dry density, refer to water content ω, the dry density ρ of cementing saline soil with according to compaction test gained optimum moisture content ω in < < Standard for test methods of earthworks > > (GBT50123-1999)
0, maximum dry density ρ
0between meet following relation: | ω
0-ω |≤10%; 0.6 ρ
0≤ ρ≤ρ
0.
Curing saline soil preparation method's of the present invention effect and advantage are: it provides a kind of curing saline soil preparation method of highly effective, by the method, solidify saline soil, can make solidified earth have enough intensity, water stability and salt erodibility endurance; Solidifying agent related in this preparation method is mixed by multiple pulvis, and production process is just simple oven dry, levigate and mechanical mixture also, cheap, simple to operate, is easy to realize, and is convenient to preserve.
(4) embodiment:
With specific embodiment, the present invention is further illustrated below.
Embodiment 1
A kind of chlorine saline soil saltiness is 2%, and the content of main salt ion is: Ca
2+:, 0.36%, Mg
2+: 0.21%, K
+and Na
+: 0.49%, SO
4 2-: 0.21%, Cl
-: 0.72%, HCO
3 -: 0.005%; Water content 22%.Select component (I) for slag; Component (II) is the activated magnesia of the light-burned gained of magnesite; Component (I): component (II): saline soil=6%:2%:92%.By the oven dry powder of component (I), component (II) mix and levigate to specific surface area be 350m
2/ kg, chlorine saline soil is tedded and makes its water content adjust to optimum moisture content 15.5% left and right, component (I), component (II) are uniformly mixed into curing saline soil with saline soil, with spreading machine will solidify saline soil pave and roll to its maximum dry density be 1.8g/cm
3, form the solidified earth roadbed with certain bearing capacity and stability.
Embodiment 2
According to engineering investigation report, learn that certain chlorine saline soil salts contg is: 5.1%, the content of leading ion is: Ca
2+: 0.21%, Mg
2+: 0.34%, K
+and Na
+: 1.66%, SO
4 2-: 0.5%, Cl
-: 2.14%, HCO
3 -: 0.05%, CO
3 2-: 0.06%; Water content is 36%.Select component (I) for slag; The activated magnesia that component (II) contains calcium oxide for the light-burned gained of rhombspar; Component (I): component (II): saline soil=12%:3%:85%.By the oven dry powder of component (I), component (II) mix and levigate to specific surface area be 400m
2/ kg, then adopts the original position saline soil at projected depth place in powder that powder spray method is mixed to form component (I), component (II) and ground to stir, and promotes while stirring, forms curing salt marsh stake in soil.Through pile quality detection, solidify the saline soil stake intensity of 28 days and reach 4.5MPa.
Embodiment 3
Seabed villaumite stain mud water content is a w=120%, and saltiness is 2.7%, and the content of leading ion is: Ca
2+: 0.24%, Mg
2+: 0.14%, K
+and Na
+: 0.92%, SO
4 2-: 0.34%, Cl
-: 0.98%, HCO
3 -: 0.02%, CO
3 2-: 0.03%; Select component (I) for the composition of slag and phosphorus slag, wherein slag mass percent accounts for 75%; Component (II) is the activated magnesia of bittern-ammonia process precipitation calcining preparation and the composition of unslaked lime, and wherein activated magnesia mass percent accounts for 70%; Component (I): component (II): saline soil=15%:5%:80%.By the powder of component (I), component (II) mix and levigate to specific surface area be 350m
2/ kg, adopt conduit pipe pneumatically to stir transmission curing technology, by component (I), component (II) mixed powder and salt marsh mud mix and blend pneumatic transfer in pneumatic transmission pipeline of smoking from subsea pump, hydraulic reclamation, to territory, reclaimation area, cofferdam, forms the ground with certain bearing capacity.Through solidified earth strength test, solidify the saline soil intensity of 28 days and reach 2.2MPa.
Embodiment 4
Sulfurous acid salt marsh soil water content is a w=36%, and saltiness is 17.5%, learns that the content of this saline soil leading ion is: Ca according to engineering investigation report
2+: 0.9%, Mg
2+: 2.4%, K
+and Na
+: 4.2%, SO
4 2-: 5.7%, Cl
-: 2.8%, HCO
3 -: 0.2%, CO
3 2-: 1.2%.Select component (I) for slag and steel slag composition, wherein slag mass percent accounts for 85%; Component (II) is the activated magnesia of bittern-ammonia process precipitation calcining preparation; Component (I): component (II): saline soil=18%:7%:75%.By the powder of component (I), component (II) mix and levigate to specific surface area be 500m
2after/kg, make mixture slurry, adopt high-pressure rotary jet grouting pile method that the original position saline soil at projected depth place in mixture slurry and ground is stirred, promote while stirring, form curing salt marsh stake in soil.Through pile quality detection, solidify the saline soil stake intensity of 28 days and reach 5.6MPa.
Embodiment 5
Restrain Method of Sulphate Salty soil water content is a w=90%, and saltiness is 10%, learns that the content of this saline soil leading ion is: Ca according to engineering investigation report
2+: 0.62%, Mg
2+: 1.56%, K
+and Na
+: 2.77%, SO
4 2-: 3.62%, Cl
-: 0.94%, HCO
3 -: 0.05%, CO
3 2-: 0.34%.Select component (I) for the composition of slag, copper metal lime-ash and silicon ash, wherein slag mass percent accounts for 80%; Component (II) is the activated magnesia of the light-burned gained of magnesite; Component (I): component (II): saline soil=20%:8%:72%.By the powder of component (I), component (II) mix and levigate to specific surface area be 350m
2/ kg, adopts underwater casting solidified earth construction technology, by component (I), component (II) mixed powder and the abundant mix of salt marsh mud, directly at shallow water, connects bank band and carries out underwater casting, forms the place with certain bearing capacity.Through solidified earth strength test, solidify the saline soil intensity of 28 days and reach 2MPa.
Embodiment 6
Sub-chlorine saline soil water content is a w=28%, and saltiness is 6.3%, learns that the content of this saline soil leading ion is: Ca according to engineering investigation report
2+: 0.32%, Mg
2+: 0.56%, K
+and Na
+: 2.27%, SO
4 2-: 0.84%, Cl
-: 2.1%, CO
3 2-: 0.14%.Select component (I) for the composition of slag, ferro-alloy cinder and downflow sludge calcination ash, wherein slag mass percent accounts for 80%; Component (II) is the activated magnesia of bittern-ammonia process precipitation calcining preparation and the composition of white lime, and wherein activated magnesia mass percent accounts for 80%; Component (I): component (II): saline soil=17%:3%:80%.Component (I), component (II) are dried and are mixed, levigate to specific surface area be 550m
2/ kg, by sub-chlorine saline soil airing near optimum moisture content, component (I), component (II) are evenly formed and solidify saline soil with saline soil mix, in soil, by design requirements, make the hole of certain diameter and the degree of depth, to solidify saline soil progressively inserts in hole, method is rammed in employing will solidify saline soil density near its maximum dry density, finally form curing saline soil cylinder in soil.Through pile quality detection, underground density is solidified the salt marsh earth pillar intensity of 28 days and is reached 6.4MPa.
Claims (4)
1. a curing saline soil preparation method, is characterized in that: after component (I), component (II) are mixed by design proportion with saline soil, by design technology moulding, obtain the curing saline soil of intensity and weather resistance engineering demands.
Described component (I) is slag or slag and one or more compositions containing the mineral dust with latent hydraulicity or volcanic ash character of active silica-alumina, and wherein the mass percent of slag accounts for 70～100%; Described component (II) is activated magnesia or activated magnesia and lime composition, and wherein the mass percent of activated magnesia ratio accounts for 50～100%; Described saline soil refers to that saltiness is the saline soil that 0.5%-30%, water content are 15%～150%, comprises chlorine saline soil, Restrain Method of Sulphate Salty soil, carbonic acid saline soil, sub-chlorine saline soil and sulfurous acid salt marsh soil.
2. a kind of curing saline soil preparation method according to claim 1, is characterized in that: it is as follows to solidify the concrete preparation technology of saline soil:
(1) component (I), component (II) are dried, respectively levigate to specific surface area be 250m
2/ kg-600m
2/ kg.
(2) according to saline soil physics-chem characteristic, saltiness, saliferous kind and ratio and solidified earth target strength, determine the mass percent of component (I), component (II) and saline soil, component (I): component (II): saline soil=3.5%～28.5%:0.5%～10.5%:70%～95%.
(3), for different engineering purposes, can adopt following four kinds of modes to make curing saline soil:
A) the oven dry powder of component (I), component (II) is mixed, saline soil water content is adjusted near optimum moisture content, with known machinery, with technique, component (I), component (II) are uniformly mixed into curing saline soil with saline soil, to solidify saline soil and pave and roll near its maximum dry density, for roadbed or low-cost road engineering.
B) the oven dry powder of component (I), component (II) is mixed, saline soil water content is adjusted near optimum moisture content, with known machinery, with technique, component (I), component (II) are uniformly mixed into curing saline soil with saline soil, adopt again known machinery and technique, in soil, by design requirements, make the hole of certain diameter and the degree of depth, to solidify saline soil is progressively filled in hole, employing simultaneously rams or static pressure method will solidify saline soil density near its maximum dry density, forms curing saline soil cylinder in soil.
C) adopt known machinery and technique, for example deep mixer, rotary jetting apparatus, powder spray machine, the original position saline soil at projected depth place in the powder being mixed to form with component (I), component (II) or slurry and ground is stirred, promote while stirring, form curing saline soil in soil.
D) adopt known machinery and technique, the powder being mixed to form or slurry and saline soil are stirred, for filled foundation with component (I), component (II).
3. a kind of curing saline soil preparation method according to claim 1, is characterized in that: the described mineral dust with latent hydraulicity or volcanic ash character containing active silica-alumina includes but not limited to slag, calcining coal gangue, ferro-alloy cinder, non-ferrous metal lime-ash, phosphorus slag, lithium slag, downflow sludge calcination ash, volcanic ash, silicon ash; Described activated magnesia can be the light-burned preparation of rhombspar or magnesite or bittern-ammonia process precipitation calcining preparation; Described lime can be unslaked lime, white lime or both combinations.
4. a kind of curing saline soil preparation method according to claim 2, it is characterized in that: near described optimum moisture content, near maximum dry density, refer to water content ω, the dry density ρ of cementing saline soil with according to compaction test gained optimum moisture content ω in < < Standard for test methods of earthworks > > (GBT50123-1999)
0, maximum dry density ρ
0between meet following relation: | ω
0-ω |≤10%; 0.6 ρ
0≤ ρ≤ρ
0.
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|---|---|---|---|
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108751863A (en) * | 2018-07-17 | 2018-11-06 | 燕山大学 | A kind of cementitious material and preparation method thereof based on salinized soil |
| CN110117098A (en) * | 2019-05-10 | 2019-08-13 | 大成科创基础建设股份有限公司 | A kind of processing method and processing device that discarded slurry recycles |
| CN113277815A (en) * | 2021-05-25 | 2021-08-20 | 中建三局集团(深圳)有限公司 | Sludge curing agent for ecological planting and preparation method thereof |
| CN115259759A (en) * | 2022-07-28 | 2022-11-01 | 中建八局第三建设有限公司 | Solid waste base composite soil curing agent and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101275394A (en) * | 2008-04-28 | 2008-10-01 | 北京航空航天大学 | Curing method for saline soil |
| CN102071029A (en) * | 2010-12-24 | 2011-05-25 | 东南大学 | Green low-carbon curing agent for soil curing |
-
2013
- 2013-12-16 CN CN201310687986.XA patent/CN103613351A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101275394A (en) * | 2008-04-28 | 2008-10-01 | 北京航空航天大学 | Curing method for saline soil |
| CN102071029A (en) * | 2010-12-24 | 2011-05-25 | 东南大学 | Green low-carbon curing agent for soil curing |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108751863A (en) * | 2018-07-17 | 2018-11-06 | 燕山大学 | A kind of cementitious material and preparation method thereof based on salinized soil |
| CN110117098A (en) * | 2019-05-10 | 2019-08-13 | 大成科创基础建设股份有限公司 | A kind of processing method and processing device that discarded slurry recycles |
| CN110117098B (en) * | 2019-05-10 | 2022-03-01 | 大成科创基础建设股份有限公司 | Treatment method and device for recycling waste slurry |
| CN113277815A (en) * | 2021-05-25 | 2021-08-20 | 中建三局集团(深圳)有限公司 | Sludge curing agent for ecological planting and preparation method thereof |
| CN115259759A (en) * | 2022-07-28 | 2022-11-01 | 中建八局第三建设有限公司 | Solid waste base composite soil curing agent and preparation method thereof |
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Application publication date: 20140305 |