CN101684038A - Curing agent and construction method of weak soil - Google Patents
Curing agent and construction method of weak soil Download PDFInfo
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- CN101684038A CN101684038A CN200810166426A CN200810166426A CN101684038A CN 101684038 A CN101684038 A CN 101684038A CN 200810166426 A CN200810166426 A CN 200810166426A CN 200810166426 A CN200810166426 A CN 200810166426A CN 101684038 A CN101684038 A CN 101684038A
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Abstract
The invention relates to a curing agent and a construction method of weak soil. The curing agent of the weak soil is characterized by comprising powder and liquid, wherein the powder comprises cementand congealing stones or the following materials in parts by weight: 0-20 parts of cement clinker, 60-95 parts of grain slag or slag, 1-5 parts of lime, 1-5 parts of plaster, 1-5 parts of anhydrous sodium sulphate, 0-10 parts of caustic soda, 0-10 parts of water glass and 0.1-3 parts of sodium fluosilicate; the liquid comprises the following components in parts by weight: 1-15 parts of polyacrylamide, 20-60 parts of pulp waste liquid, 10-40 parts of cement retarder, 0.5-1.5 parts of OP emulsifier, 0.3-1.0 part of carrageenan, 0.3-1.0 part of xanthan gum and 0.5-1.5 parts of alpha-olefin sulfonate. The curing agent is previously prepared into seriflux before being used, and the weak soil and the curing agent seriflux are uniformly stirred by mechanical stirring equipment and then are spreador compacted. The addition quantity of the powder is greatly reduced because a small quantity of the liquid is added; in addition, materials can be easily obtained, and the performance of consolidated soil is superior, thus the curing agent of the weak soil, i.e. sludge and the like, has high efficiency and environmental protection.
Description
Technical field
The invention belongs to the fixed solidifying agent technical field of using of weak soil, relate in particular to a kind of solidification treatment chemical and constructional method thereof that is used for the weak soil of different moisture content.
Background technology
Land volcanic rock or sedimentary rock experience millions upon millions of year-climates to be changed, rock decay is pulverized, tiny ground particle is under landlocked river and the transportation of coastal morning and evening tides waterpower, estuario and bank, can deposit in unhurried current areas such as rivers and lakes reservoirs precipitates into soft layer, also the life of upstream and industrial pollutants is carried simultaneously to be mingled with wherein.Formed soft layer generally has that particle is thin, organic content is high, water content is high more and is difficult for characteristics such as precipitation, causes the bearing capacity of soft layer low, the porosity height, and carrying back sedimentation is big, very difficultly directly uses as building lot.
Along with development of the national economy development, in the construction of coastal economy district, hydraulic engineering construction, oceanographic engineering construction and urban landscape construction, all will produce a large amount of dredging silts every year.Dredging silt is stacked and is taken up an area of the problem that can produce Pollutants Diffusion and destroy water surrounding on the one hand, construction land has heavy demand to the earthwork on the other hand, cut into a mountain for quarrying, dig the river and adopt sand and can produce the destruction that is difficult to repair, so the contradiction between such demand and the pollution becomes increasingly conspicuous resource, ecology and environment.For this reason, carried out a large amount of weak native fixed research both at home and abroad.Wherein soft soil foundation precipitation, mud are baked bricks and fixed these three aspects of solidifying agent are large-scale application and the field of obtaining better result.The representative technology of soft soil foundation precipitation is exactly a vacuum preloading, and technique of soft soil foundation treatment exists construction period to grow the problem of the bearing capacity lower (0.06-0.08Mpa) behind (0.5-1) and the ground precipitation; Utilize mud to bake bricks report is all arranged both at home and abroad, the soil particle grating of mud often can not satisfy and is directly used in the requirement of baking bricks, need admixtures such as admixture sandstone, too high water content and too high organic content can bring more trouble, remain the environmental pollution problem at strange land roping mud; The fixed weak soil of solidifying agent is the most rising technology, and this technology stirs weak native original place such as mud fixed, the bearing capacity of foundation soil height of handling (0.1～3Mpa), the time lacks (7～28 days), large-scale application suits.
Abroad the modern age of soft soil foundation process field technology the experience in 30～60 years is arranged, the deep-mixed pile technical work of China is carried out early, technique of soft soil foundation treatment has obtained large-scale application, but also fall behind aspect the processing of shallow poor subsoil ground abroad more than at least 15 years, developed countries such as middle Northern Europe, the U.S., Japan and Russia take its place in the front ranks of the world on soft soil foundation is handled.The plate body stabilization technique of Finland ALLU company and German KELLER company is domestic to be attempted doing to introduce, little abroad in solidifying agent technical field and domestic technique gap, the sludge curing agent that adopts still is cement, lime and slag etc. mainly at present, and every cubic metre of addition content is at 120～400 kilograms.Handle soft soil foundations such as mud with solidifying agent, the mode that generally adopts is that cement class inorganic materials is stirred with mud both at home and abroad, carries out then that roping paves or preloading is fixed.The addition content when but cement class material is used for silt consolidation is bigger, the addition content scope that adopts cement fixed high-moisture percentage (90～1500%) mud and gyttja is between 12～30%, and the unconfined compression strength of fixed mud after 28 days only is 0.1～0.6Mpa.Domestic sludge solidification adopts a large amount of inorganic materials of admixture such as flyash, lime, slag, slag etc. in addition, and its admixture quantity is up to 25%-60%.Because of these material source inconvenience, traffic capacity are big, be difficult to large scale application.
Domestic foundation bearing requires to be generally 0.06～0.25Mpa, and the U.S. is 0.12～0.35Mpa, and Japan is 0.12～0.3Mpa.Can utilize physics and chemofacies bonded method to shorten construction period by improving and improving weak native the processing and use curing agents, accelerate precipitation, improve bearing capacity, reduction foreign material addition content, this is the direction of this field development of new techniques.
Summary of the invention
The purpose of this invention is to provide that few, the weak native precipitation of a kind of addition content is fast, bearing capacity is high, the good solidifying agent of induration soaking-resistant, solve existing sludge solidification technology and have the shortcoming that the induration bearing capacity is low, sludge dewatering is difficult, external admixture material is many.
The technical solution used in the present invention is as follows:
A kind of weak soil is fixed to be made up of pulvis and liquor raw material with solidifying agent, the component that described pulvis is cement, coagulate stone or comprise following weight proportion is formed: cement clinker 0～20 weight part, grain slag or slag 60～95 weight parts, lime 1～5 weight part, gypsum 1～5 weight part, Sodium sulfate anhydrous.min(99) 1～5 weight part, caustic soda 0～10 weight part, water glass 0～10 weight part, Sodium Silicofluoride 0.1～3 weight part; Described liquor comprises the component composition of following weight proportion: polyacrylamide 1～15 weight part, spent pulping liquor 20～60 weight parts, cement setting retarder 10～40 weight parts, OP emulsifying agent 0.5～1.5 weight part, carrageenin 0.3～1.0 weight part, xanthan gum 0.3～1.0 weight part, sulfonated 0.5～1.5 weight part.
It is ordinary Portland cement, slag cement, aluminosulfate cement that described soft soil foundation is handled with cement in the solidifying agent pulvis; The described stone that coagulates is for coagulating stone A, coagulate stone B, coagulating stone C; Described cement clinker is a Portland clinker; Described grain slag or slag are through pyroprocess incinerating active material; Described lime is calcium lime powder or dry hydrate; Described gypsum is dehydrated gyp-, a water gypsum, dihydrate gypsum and phosphogypsum; Described Sodium sulfate anhydrous.min(99) is for containing crystal water sodium sulfate; Described caustic soda is a sodium hydroxide; Described water glass is the aquation water glass, and modulus is 2.2～3.7; Described Sodium Silicofluoride is a technical grade; The pulvis weight part always adds up to 100 parts.
Fixed, nonionic negative, positive of described weak soil and zwitter-ion with polyacrylamide in the solidifying agent liquor, be particle or powdery, molecular weight is 6,000,000～1,500 ten thousand, ion degree is 5～50%, separate concentration of polyacrylamide as water and be generally 6～12%, the selection of polyacrylamide ionic type should differently according to the chemical ingredients of mud or gyttja be decided; Described spent pulping liquor is wood pulp, reed pulp and straw paper pulp waste, and the lignosulfonic acid salts contg is 40～50% in the spent pulping liquor, and sulfonated lignin are meant calcium lignin sulphonate and sodium lignosulfonate here; Described cement setting retarder is sold cement setting retarder, softening agent and water reducer for the merchant; Described OP emulsifying agent is industrial emulsion agent OP-10, and concentration is 70～95%; Described carrageenin and xanthan gum are technical grade; Described sulfonated is its sodium salt or calcium salt, can be the mixture of hydroxyalkylated sulfonic acid salt and stilbene-4,4'-bis-(1-azo-3, 4-dihydroxy-benzene)-2,2'-disulfonate; The liquor weight part always adds up to 100 parts, and dilute with water concentration to 20～40% uses during the preparation liquor, that is to say that amount of water accounts for 60～80% of gross weight.
Described cement, coagulate stone and pulvis, look different, can adopt the combination of single kind and liquor, be used in combination with liquor again after also can adopting two or more different ratios mixing, can also use separately by pulvis with the adaptability of liquor and various weak soil.When pulvis uses separately, use after can be made into slurries, also can be dry powder and directly use.
Described soft soil foundation is handled the amount with solidifying agent, should be according to the design requirements of bearing capacity of foundation soil, determine by laboratory test, the native addition content of the general every cubic metre of weakness of pulvis is 50～120 kg, the native addition content of the general every cubic metre of weakness of liquor is 1～2.5 liter (concentration 25%), with pulvis by water cement ratio 0.3～1.0 slurrying and add liquor and mix with weak soil again; The high more addition content of requirement for bearing capacity is high more, and the high more addition content of organic content is high more, and the high more addition content of fine content is high more.
Described soft soil foundation, it is characterized in that described weak soil is meant the mud of different moisture content, the organic gyttja of high-content and contains the powder fine sand that surpasses 5% mud and gyttja, the water content that contains the powder fine sand of more fine is 25～50%, the water content of mud is 50～150%, and the water content of gyttja is 150～1500%.
The native solidifying agent of described weakness is applicable to existing preparation of construction, and fixed construction is stirred at the scene of can adopting on the spot, can be used for Deep Mixing Piles Construction, can be used for packed construction, can be used for the strange land fill construction; To the soft soil foundation of the high organic content of high-moisture, stir process piling prepressing consolidation effect is better on the spot, and 0.3～1 meter thick mountain of preloading skin soil, building waste or sandstone material can quicken draining on induration, improves bearing capacity of foundation soil.
The construction equipment of the native solidifying agent of described weakness can adopt vertical and horizontal whipping device.Vertical whipping device has single shaft and multiaxis, based on the solidifying agent slurry feed.Horizontal whipping device mainly is that twin screw stirs, based on powdery solidifying agent feed.Vertical alr mode, stir shaft is perpendicular to the ground, is furnished with grout outlet on stir shaft or the agitating vane, and stir shaft drives agitating vane and rotates, and finishes the stirring work of effusive solidifying agent slurries of grout outlet and weak soil.But stir shaft is clamped on the rocking arm of self-moving vehicle or snagboat, provide the device of solidifying agent slurries can adopt the pulp feeding system of deep-mixed pile to stir shaft, supply slurry by a sebific duct to stir shaft, can reach more than 800 meters for the slurry distance, deep-mixed pile length can reach 30 meters, and import equipment can reach 70 meters.The twin screw of horizontal alr mode is in an oval groove, and the entrance end of groove is packed into weak native by excavator or conveying belt, provide the powdery solidifying agent by cementing tank, stirs extruding by twin screw, finishes the stirring work of weak soil and solidifying agent.The solidified earth that stirs is loaded onto carrier vehicle or is transported to the use place by conveying belt by excavator in the outlet of groove.Vertical alr mode, the water content requirement broad to weak soil can stir construction on the spot, and energy requirement is less, and use range is wider.There is native carrying problem in horizontal alr mode, needs more energy, and weak native water content is required generally can not be above 60%, and the too high weak soil of water content is not suitable for adopting.
Described soft soil foundation is handled form of construction work, can be with solidifying agent of the present invention as the weak native fixed application of building place, road embankment, roadbed, subbase.
Described soft soil foundation is handled form of construction work, solidifying agent of the present invention can be solidified as weak soil such as lake, river and the seashore dredging mud that desilting produced, and the strange land landfill is used.
Described soft soil foundation is handled form of construction work, can solidifying agent of the present invention is fixed as the weak soil such as bottom mud of river, lake, canal, reservoir water body, and anti-pollution with purifying water body.
Described soft soil foundation is handled form of construction work, can be used to build highway, the railway bed of soft clay ground, fill cofferdam, the reinforcing of speedily carrying out rescue work with solidifying agent of the present invention as the native fixed pack use of weakness.
Described soft soil foundation is handled form of construction work, can be with the procedure of solidifying agent of the present invention as the mud vacuum preloading.For making scope of operation work on the board-plugging device as early as possible, adopt the mud stirring on 0.4～1 meter on solidifying agent of the present invention and top layer fixed, formed surperficial hard formation, and replaced traditional geotextile, chaste tree basketry, bamboo basketry, plastic grill and sand bedding course in 2～7 days, accelerate speed of application, reduce construction cost.
Described soft soil foundation is handled form of construction work, solidifying agent of the present invention can be handled as composite foundation and be used.In handling than deep layer (generally greater than 5 meters) soft soil foundation, deep-mixed pile is used with the plate body stabilization technique mode of combining, have more advantage.
Pulvis of the present invention except that with each component through levigate mixing or mix levigate formulated, can also select cement or coagulate stone according to the adaptability of weak soil with solidifying agent of the present invention.General cement or coagulate stone working strength grade more than P.O32.5, its add-on is 3～10% of a weak native weight.It is mainly by hydration reaction thing Dicalcium Phosphate (Feed Grade) and tricalcium silicate and the formed crystal water absorption portion of ettringite moisture, formed acicular crystals is filled the space, active inorganic materials grain slag or scoriaceous pozzolanic reaction and form crystallization particle and space net rack by them, help discharge moisture in soft soil foundation as passage early stage, later stage helps increasing concretion body strength as skeleton.The liquor add-on is 0.1%～0.25% of a weak native weight, and it mainly acts on is by flocculation and granuleization, makes the fine particle alligatoring, improves permeability coefficient and dewatering speed.Pulvis and liquor adding suitable quantity of water can be modulated into slurries during use, join in proportion in the weak soil then.By detecting as can be known, the initial stage permeability coefficient of the fixed weak soil of solidifying agent of the present invention is 10
-5About cm/s, about 3 orders of magnitude have been improved than original soil.Solidifying agent of the present invention joins water ratio greater than in 200% the mud, can be pumped into more at a distance, joins in the weak soil of water ratio 25～150% and can directly stir fixed reinforcement on the spot.After testing, the unconfined compression strength of high-moisture mud after the room temperature placement was soaked 5 then on the 2nd of mixing this solidifying agent can reach 0.25～0.9Mpa, and has the characteristics of superior water-repellancy, water stability and the hydraulicity.Especially pollutents such as contained heavy metal, pathogenic agent have been significantly reduced its rate of release by after fixed, the sealing in the mud, after testing, the favorable environment protection energy are arranged.
Grain slag and various slag have passed through high-temperature calcination as slag, aluminium ore slag, iron ore slag, volcanic ash etc. in burning or industrial production, have very high lateral reactivity, effectively strengthen the solidifying agent performance through excitation energy.When adopting this solidifying agent to carry out the earth roadbed build of weakness, can suitably increase the ratio of mixing solidifying agent, the performance of weak soil also can correspondingly improve simultaneously, when the mucky soil water ratio when lower limit (25%～40%), directly the pulvis of admixture about 8% and about 0.15% liquor can make the intensity of soil reach 2.1Mpa.Contain fine and reach 15% powder fine sand, saturation water 30%, the pulvis of admixture 10% and 0.2% liquor can make basic native intensity reach 6Mpa.Solidifying agent of the present invention can be applied in the processing of road foundation, and the soil that excavates is carried out consolidation process and compacting, and its cost of building the road not only can reduce by 50%, and every performance of its roadbed is significantly better than conventional liming earth and inorganic material roadbed, utilize this solidifying agent to build the road, its evenness of road surface is bright and clean, and plate body is good, the bearing capacity height, good endurance, stability is high under different weather condition, as freezes and do not split, do not burst and become muddy when a thaw sets in spring, and chance water is not soft not muddy.On equal highway layout strength level, but supercrust and groundwork thickness attenuate about 1/3rd.Can directly use in low traffic flow or its induration layer of remote districts as low-cost pavement.Use this solidifying agent also can change the mud of dredging desilting into geotechnological material, after this solidifying agent and mud stirred, can spread out and put on compacting, stirring stacking, piling prepressing and pack according to the difference of water ratio laminates, its induration can reach higher bearing capacity of foundation soil, is used to make the island, the base of building the road, ground is made in the cofferdam, and manufacture material of construction etc., can anti-secular seawater and the immersion of fresh water and can not occur leaching and pollute, and can keep certain bearing capacity.
Adopt solidifying agent of the present invention that consolidation process is carried out in great water bodies such as river, the lake bottom and the lateral soil body, the substituted for plastic film is eliminated the disadvantageous effect of plastic film construction to eubiosiss such as water body periphery herbosas fully.And the permeability coefficient of its soil body can be adjusted by the incorporation of regulating sludge curing agent.Form of construction work can be according to the engineering specifications of locality, and the mode that the employing wet method stirs pave construction or dry mixing compacting construction realizes.
The Industrial emissions that each component that this solidifying agent adopted is the commercial goods or obtains easily, cost of manufacture is lower, and the addition content when carrying out weak native consolidation process simultaneously is few, and concretion body strength height, soaking-resistant are good.Can be widely used in the solidification treatment of desilting mud, the antiseep of the reinforcement of road base layer soil and water bottom mud layer is handled, and builds island, folded dam, fixed landfill, pack is speedily carried out rescue work and soft layer stabilization treatment etc.By adding a spot of liquor, greatly reduce the usage quantity of pulvis such as cement, this solidifying agent is environmental protection and high efficiency products, will produce bigger economic benefit and huge social benefit.
Description of drawings
Fig. 1 is a solidifying agent addition content of the present invention to the rule that influences of the unconfined compression strength of the weak native induration of difference.
Fig. 2 is the influence rule of mucky soil water content to solidified earth intensity.
Embodiment
Wherein the pulvis raw material is: the P.O42.5 ordinary Portland cement.
The raw material of liquor consists of: anionic polyacrylamide 5kg, and spent pulping liquor 45kg, cement setting retarder 45kg, OP-10 industrial emulsion agent 2.0kg, carrageenin 0.5kg, xanthan gum 0.5kg, alpha-olefin sodium sulfonate 2.0kg is mixed and made into liquor with 3 times of water.
Cement calculated by water cement ratio 0.45 needs amount of water, mixes with liquor, makes cement grout with cement mixing again and uses, and the ratio of cement and liquor is about 50: 1, and the cement grout of using preparation carries out consolidation process to mud to be tested.Test is selected for use newly developed area, Harbor, Tianjin to blow silt and is made ground mud, and this mud water content is about 100% after measured, and organic content is 5%.
The solidifying agent of embodiment 1 preparation and the admixture ratio of mud are, the P.O42.5 ordinary Portland cement adds 45～120kg in 1 cubic metre of mud, and liquor 1～2.5kg adds 20～54kg water again and is deployed into cement grout, be spiked in the mud and mix, carry out consolidation test.In the laboratory, die trial size Ф 50 * 100mm placed rare soft consolidation process mud 1 day earlier in model, and room temperature was placed 1 day after the demoulding, soaked 5 days, carried out unconfined compression strength then and measured.Detected result is that 7 days intensity is at 0.25～0.58Mpa, silt consolidation intensity and cement accession are linear, and cement accession hard intensity more is high more, not with 7 days intensity of liquor at 0.09～0.21Mpa, the silt consolidation body of admixture cement is difficult for dehydration separately, so intensity is lower.Mix the concretion body strength that sludge curing agent of the present invention obtains and improved 1.5～1.8 times, and along with the raising of addition, the intensity amplification of induration is big more.
Wherein the pulvis raw material is: Portland clinker 15kg, and water granulated slag 74kg, lime 2kg, gypsum 5kg, Sodium sulfate anhydrous.min(99) 3kg, Sodium Silicofluoride 1kg pulverizes the back mixing with above-mentioned raw materials and obtains pulvis;
The raw material of liquor consists of: amphiprotic polyacrylamide 15kg, and spent pulping liquor 40kg, cement setting retarder 40kg, OP-10 emulsifying agent 2.0kg, sulfonated 2.5kg, carrageenin 0.5kg is mixed and made into liquor with 3 times of water.
The solidifying agent of the present invention of Application Example 2 preparations carries out consolidation test to Tanggu, Tianjin riverway sludge, mud water content 110%, organic content 6%, admixture pulvis 4～8%, liquor 0.2%, fixed mud sample was placed in model 1 day, and room temperature was placed 1 day after the demoulding, soaked 5 days, unconfined compression strength intensity is at 0.2～0.45Mpa.
Wherein the pulvis raw material is: Portland clinker 10kg, active water granulated slag 83kg, lime 3kg, gypsum 3kg, Sodium Silicofluoride 1kg;
The liquor raw material consists of: polyacrylamide 6kg, spent pulping liquor 60kg, caustic soda 2kg, cement setting retarder 30kg, OP-10 emulsifying agent 1.5kg, sulfonated 0.5kg.
The sludge curing agent of Application Example 3 preparations carries out consolidation process to the mucky soil of Tangshan Cao Feidian, the water ratio of the mucky soil of handling is 48%, the pulvis that adds this sludge curing agent is 7%, liquor is 0.15%, stir back mud room temperature and placed 2 days, the unconfined compression strength of measuring in back 5 days of soaking is 0.75Mpa.Induration after this consolidation process is carried out the antiseep test, find that it has good antiseep.As seen this sludge curing agent can replace plastic film to handle as the antiseep of great water body fully, and the permeability coefficient of the water body ground and the side soil body can be regulated according to amount and form of construction work that solidifying agent of the present invention is mixed in adjusting.
Wherein the pulvis raw material is: active grain slag 83kg, lime 6kg, gypsum 3kg, Sodium sulfate anhydrous.min(99) 4kg, Sodium Silicofluoride 1.5kg, modulus 3 water glass 2.5kg;
The raw material of liquor consists of: polyacrylamide 10kg, calcium lignin sulphonate 80kg, OP-10 emulsifying agent 2.0kg, modulus 2.8 water glass 4.7kg, alpha-olefin sodium sulfonate 0.3kg.
Get east, Ningbo money lake silt, water ratio is 90%, and the pulvis that adds this sludge curing agent is 8%, and liquor is 0.2%, and induration was at room temperature placed two days, and soaking, its unconfined compression strength of mensuration is 0.59Mpa after 5 days.
Pulvis raw material wherein is: Portland clinker 10kg, active grain slag 85kg, caustic soda 1.5kg, Sodium sulfate anhydrous.min(99) 2.5kg, Sodium Silicofluoride 1kg;
The raw material of liquor consists of: polyacrylamide 16kg, cement softening agent 30kg, spent pulping liquor 50kg, OP-10 emulsifying agent 2kg, carrageenin 1kg, alpha-olefin sodium sulfonate 1kg.
Get Dalian mud and carry out consolidation test, the mud water ratio is 64%, and mixing this sludge curing agent pulvis is 6%, and liquor is 0.2%, and induration was at room temperature placed 2 days, and soaking, its unconfined compression strength of mensuration is 0.67Mpa after 5 days.
Wherein the pulvis raw material is: coagulate stone C
The raw material of liquor consists of: polyacrylamide 16kg, cement softening agent 30kg, spent pulping liquor 50kg, OP-10 emulsifying agent 2.0kg, xanthan gum 1kg, hydroxyalkylated sulfonic acid sodium 0.5kg, sodium disulfonate 0.5kg.
To coagulate each raw material stirring of stone C and liquor mixes and obtains this sludge curing agent.
The sludge curing agent of Application Example 6 preparations carries out consolidation test to prince wife Cao pasture mud, the mud water ratio is 90%, the pulvis that mixes this sludge curing agent is 8%, liquor is 0.15%, room temperature was placed 2 days, soaking, its unconfined compression strength of mensuration is 0.67Mpa after 5 days, and the intensity that independent admixture coagulates stone C is 0.42Mpa.
Embodiment 7 gets each feed composition of weak native solidifying agent by following weight proportion:
Wherein the pulvis raw material is: the P.O42.5 ordinary Portland cement
The raw material of liquor consists of: polyacrylamide 11kg, spent pulping liquor 55kg, cement softening agent 30kg, OP-10 emulsifying agent 2.0kg, hydroxyalkylated sulfonic acid sodium 0.5kg, sodium disulfonate 0.5kg, carrageenin 1kg.
The weak native solidifying agent of Application Example 7 preparations carries out consolidation test to Dayao gulf, Dalian mud, and the mud water ratio is 110%, and the glutinous grain of powder content accounts for more than 95%, mixing cement is 8%, liquor is 0.15%, and room temperature was placed 2 days, and soaking, its unconfined compression strength of mensuration is 0.87Mpa after 5 days.
Embodiment 8 gets each feed composition of weak native solidifying agent by following weight proportion:
The pulvis raw material is: Portland clinker 10kg, active grain slag 85kg, gypsum 1.5kg, Sodium sulfate anhydrous.min(99) 2.5kg, Sodium Silicofluoride 1kg; Admixture liquor not.
The weak native solidifying agent of Application Example 8 preparations carries out consolidation test to the Dongying Huanghe delta, Shandong silt, the silt water ratio is 29%, silt content accounts for more than 77%, organic content 4%, liquid limit 25%, plastic limit 20%, liquidity index 1.72, mixing pulvis is 6%～10%, room temperature was placed 2 days, soaking, its unconfined compression strength of mensuration is 0.79～2.1Mpa after 5 days, dry density 1.64g/cm
3
Embodiment 9 gets each feed composition of weak native solidifying agent by following weight proportion:
The pulvis raw material is: Portland clinker 10kg, active grain slag 85kg, gypsum 1.5kg, Sodium sulfate anhydrous.min(99) 2.5kg, Sodium Silicofluoride 1kg; Admixture liquor not.
The weak native solidifying agent of Application Example 9 preparations carries out consolidation test to Binhai New Area in Tianjin eco industrial park road roadbed soil, mucky soil water content 24%, organic content 4%, mixing pulvis is 6%, adopt and light-dutyly hit real merit and hit reality, its unconfined compression strength is measured in the plastics bag maintenance after 7 days be 1.2Mpa, dry density 1.62g/cm
3
The pulvis raw material is: Portland clinker 10kg, active grain slag 85kg, gypsum 1.5kg, Sodium sulfate anhydrous.min(99) 2.5kg, Sodium Silicofluoride 1kg; Admixture liquor not.
The weak native solidifying agent of Application Example 10 preparations carries out consolidation test to place, Tanghai County, Hebei foundation soil, mucky soil water content 25%, organic content 5%, mixing pulvis is 4%～6%, adopt and light-dutyly hit real merit and hit reality, its unconfined compression strength is measured in the plastics bag maintenance after 7 days be 0.7～1.3Mpa, dry density 1.61g/cm
3
Claims (15)
1. native solidifying agent of weakness and constructional method thereof, it is characterized in that it comprises the pulvis and the liquor raw material composition of following parts by weight proportioning, described pulvis is cement, coagulates stone or comprise following weight part proportioning composition: cement clinker 0～20 weight part, grain slag or slag 60～95 weight parts, lime 1～5 weight part, gypsum 1～5 weight part, Sodium sulfate anhydrous.min(99) 1～5 weight part, caustic soda 0～10 weight part, water glass 0～10 weight part, Sodium Silicofluoride 0.1～3 weight part; Described liquor comprises the component composition of following weight proportion: polyacrylamide 1～15 weight part, spent pulping liquor 20～60 weight parts, cement setting retarder 10～40 weight parts, OP emulsifying agent 0.5～1.5 weight part, carrageenin 0.3～1.0 weight part, xanthan gum 0.3～1.0 weight part, sulfonated 0.5～1.5 weight part.This solidifying agent should be made slurries earlier before using in weak soil, spread out and put on or compacting after using mechanical stirring equipment that weakness soil is stirred with the solidifying agent slurries.
2. the fixed solidifying agent pulvis of using of weak soil according to claim 1 is characterized in that described cement is ordinary Portland cement, slag cement, aluminosulfate cement; The described stone that coagulates is for coagulating stone A, coagulate stone B, coagulating stone C; Described cement clinker is a Portland clinker; Described grain slag or slag are through pyroprocess incinerating active material; Described lime is calcium lime powder or dry hydrate; Described gypsum is dehydrated gyp-, a water gypsum, dihydrate gypsum and phosphogypsum; Described Sodium sulfate anhydrous.min(99) is for containing crystal water sodium sulfate; Described caustic soda is a sodium hydroxide; Described water glass is the aquation water glass, modulus 2.2～3.7; Described Sodium Silicofluoride is a technical grade; The pulvis weight part always adds up to 100 parts.
3. the fixed solidifying agent liquor of using of weak soil according to claim 1, it is characterized in that described polyacrylamide is negative, positive, nonionic and zwitter-ion, be particle or powdery, molecular weight is 6,000,000～1,500 ten thousand, ion degree is 5～50%, separating concentration of polyacrylamide as water is 6～12%, and the selection of polyacrylamide ionic type should differently according to the chemical ingredients of mud or gyttja be decided; Described spent pulping liquor is wood pulp, reed pulp and straw paper pulp waste, and the lignosulfonic acid salts contg is 40～50% in the spent pulping liquor, and sulfonated lignin are meant calcium lignin sulphonate and sodium lignosulfonate here; Described cement setting retarder is sold cement setting retarder, softening agent and water reducer for the merchant; Described OP emulsifying agent is industrial emulsion agent OP-10, and concentration is 70～95%; Described carrageenin and xanthan gum are technical grade; Described sulfonated is its sodium salt or calcium salt, can be the mixture of hydroxyalkylated sulfonic acid salt and stilbene-4,4'-bis-(1-azo-3, 4-dihydroxy-benzene)-2,2'-disulfonate; The liquor weight part always adds up to 100 parts.Dilute with water concentration to 20～40% uses during the preparation liquor, that is to say that amount of water accounts for 60～80% of gross weight.
4. cement according to claim 2, coagulate stone and pulvis, look different with the adaptability of liquor and various weak soil, can adopt the combination of single kind and liquor, be used in combination with liquor again after also can adopting two or more different ratios to mix, but also pulvis use separately.
5. according to claim 2, the fixed addition content of 3 described weak soil with solidifying agent, should be according to the design requirements of soft soil foundation bearing capacity, the native addition content of the general every cubic metre of weakness of pulvis is 50～120 kg, the native addition content of the general every cubic metre of weakness of liquor is 1～2.5 liter (concentration 25%), with pulvis by water cement ratio 0.3～1.0 slurrying and add liquor and mix with weak soil again; The high more addition content of requirement for bearing capacity is high more, and the high more addition content of organic content is high more, and the high more addition content of fine content is high more.
6. weak soil according to claim 1 is characterized in that described weak soil is meant the mud of different moisture content, mucky soil, the organic gyttja of high-content and contains and surpasses 5% the mud and the powder fine sand of gyttja.The powder fine sand water content that contains more fine is 20～50%, and the water content of mud is 50～150%, and the water content of gyttja is 150～1500%.
7. soft soil foundation according to claim 1 is handled and is applicable to existing preparation of construction with solidifying agent, and fixed construction is stirred at the scene of can adopting on the spot, can be used for Deep Mixing Piles Construction, can be used for packed construction, can be used for the strange land fill construction; Stir process piling prepressing consolidation effect is better on the spot to the soft soil foundation of high-moisture, high organic content.Construction equipment can adopt vertical and horizontal alr mode.Vertical alr mode divides single shaft and multiaxis whipping device, based on the solidifying agent slurry feed.Horizontal alr mode mainly is the twin screw whipping device, based on powdery solidifying agent feed.
8. soft soil foundation according to claim 7 is handled form of construction work, and the weak soil that solidifying agent of the present invention can be used to build place, road embankment, roadbed, subbase is fixed.
9. soft soil foundation according to claim 7 is handled form of construction work, solidifying agent of the present invention can be used for weak soil curing such as lake, river and the seashore dredging mud that desilting produced, and the strange land landfill is used.
10. soft soil foundation according to claim 7 is handled form of construction work, and the weak soil such as bottom mud that solidifying agent of the present invention can be used for river, lake, canal, reservoir water body are fixed, and are anti-pollution with purifying water body.
11. soft soil foundation according to claim 7 is handled form of construction work, solidifying agent of the present invention can be used for weak native fixed pack, is used to build highway, the railway bed of soft clay ground, fill cofferdam, the reinforcing of speedily carrying out rescue work.
12. soft soil foundation according to claim 7 is handled form of construction work, the procedure of solidifying agent of the present invention as the mud vacuum preloading can be used.For making scope of operation work on the board-plugging device as early as possible, adopt the mud on 0.4～1 meter on solidifying agent of the present invention and top layer to stir fixed, formed surperficial hard formation in 2～7 days, replace traditional geotextile, chaste tree basketry, bamboo basketry, plastic grill and sand bedding course, be more convenient for adopting drain board directly to be connected with water shoot, accelerate speed of application, reduce construction cost.
13. soft soil foundation according to claim 7 is handled form of construction work, solidifying agent of the present invention can be used for composite foundation and handle construction.In handling, with the deep-mixed pile use that combines with the plate body stabilizing layer than deep layer (generally greater than 5 meters) soft soil foundation.
14. soft soil foundation according to claim 7 is handled form of construction work, solidifying agent of the present invention can be used for impervious wall construction.In the soft soil foundation construction, for preventing seawater or underground water to handling the erosion of groundwork, the mixing pile of solid matter commonly used constitutes the antiseepage partition wall, to avoid soft soil foundation to collapse and slippage.Adopt the cement earth pile cost higher, make stake with the stirring of this solidifying agent and can reduce material cost greatly.
15. soft soil foundation according to claim 7 is handled form of construction work, solidifying agent of the present invention can be used for cofferdam construction.The cofferdam that solidified earth mixing pile grid is constituted, because bearing capacity is higher, folded bag becomes the weir to reduce weight; Owing to gather materials on the spot, become the weir to save strange land material roping than mountain building stones preloading.
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| CN200810166426A CN101684038A (en) | 2008-09-28 | 2008-09-28 | Curing agent and construction method of weak soil |
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| CN200810166426A CN101684038A (en) | 2008-09-28 | 2008-09-28 | Curing agent and construction method of weak soil |
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Application publication date: 20100331 |