CN102031119A - Soil curing agent directly processing soil into surface layer of road - Google Patents
Soil curing agent directly processing soil into surface layer of road Download PDFInfo
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- CN102031119A CN102031119A CN2010105576353A CN201010557635A CN102031119A CN 102031119 A CN102031119 A CN 102031119A CN 2010105576353 A CN2010105576353 A CN 2010105576353A CN 201010557635 A CN201010557635 A CN 201010557635A CN 102031119 A CN102031119 A CN 102031119A
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Abstract
The invention discloses a soil curing agent directly processing soil into the surface layer of a road and provides an environment-friendly soil curing agent, which has very obvious soil curing performance and wide practicability and is simple in construction. Particularly, when field soil is directly processed into the surface layer of a road by the soil curing agent and the composite cured soil directly substitutes a cement surface layer and an asphalt surface layer, only a small amount of curing agent and 2 to 5 percent of cement are mixed and then the mixture is used for stabilizing the surface layer, wherein the compression strength in 7 days can be up to 5 to 10MPa. The soil curing agent meets the requirement of directly substituting for a base layer, a water stability layer and the surface layer; the construction cost is saved by 30 to 50 percent; the soil curing agent has a low price and high fireproof performance, shock resistance and durability, is simple in construction, overcomes the performance defects of the traditional soil curing agent; and serving as the surface layer, the soil curing agent better accords with the social requirements of environment friendliness, ecology and energy conservation.
Description
Technical field
The present invention is the part of highway, civic building engineering, belongs to the fine chemical technology field.
Background technology
The existing abroad nearly use history more than 30 years of soil curing agent technology is widely used in engineering projects such as national motorway, airport, sea wall, harbour, harbour, water conservancy antiseepage.This technology mainly is to adopt the next strong roadbed of soil on the spot, make and form more firm, stable, a persistent integral slab block structure, problems such as ubiquitous damaged or destroyed by flood in the old technology road, differential settlement, reflective crack are solved, thereby improved the carrying capacity of roadbed greatly, made road deck attenuate and crushed rock base course cancel.Thereby the direct investment on road basis is reduced, reduced the roadupkeep cost.
The soil-solidified-agent utilisation technology is approved gradually to the reinforcement of environmental protection, the ecological awareness along with the Chinese government and the common people in recent years and is promoted that this has benefited from gathering materials on the spot, reduce exploitation, conserve water and soil, save the good characteristics of construction cost, begun to be applied to highway subgrade, during seepage control project etc. are handled.Now have the product of nearly ten soil-solidified-agents to use abroad in China, but since its to the requirement of soil property and the costliness of price, practical application is few.The domestic product that nearly ten soil-solidified-agents are also arranged, owing to be subjected to factor affecting such as geographical environment weather, these all are confined to the subbase of the low highway of rank and the processing of basic unit, the present invention can replace steady layer of water and surface layer directly to use, water resistance behind the solution soil curing, core bottleneck problems such as solar heat protection anti-freezing property, its sexual valence advantage will attract huge market resource, and promptly soil-solidified-agent will have more wide application prospect.
Summary of the invention
Technical problem solved by the invention is to provide a kind of soil directly is treated as the soil-solidified-agent of road deck, to solve the shortcoming in the above-mentioned background technology.
Technical problem solved by the invention realizes by the following technical solutions:
A kind of soil-solidified-agent that soil directly is treated as road deck, the per-cent of raw material and quality thereof is: water glass 50-60%, dehydrated alcohol 2-5%, polyacrylamide 5-10%, Walocel MT 20.000PV 5-10%, sodium hydroxide 8-15%, potassium hydroxide 8-15%, magnesium hydroxide 2-5%, Sodium Silicofluoride 2-5%, alum 2-5%, water reducer 2-5% etc., above-mentioned raw materials percentage ratio sum is 100%.
In the reactor that heating unit, reflux exchanger, whipping appts are housed with water glass (water glass), anhydrous diethyl ether, alum [KAl (SO
4)
212H
2O], Walocel MT 20.000PV (HPMC), polyacrylamide (PAM), Sodium Silicofluoride (Na
2SiF
6) wait and be heated to 80-100 ° of down reaction, the composite copolymerization liquid cooling to 15-20 °, is added 99% liquid hydrogen sodium oxide (NaOH), magnesium hydroxide [Mg (OH)
2], potassium hydroxide raw material stirring such as (KOH) is even, reacts 1-2 hour, adds practical high speed compound machines such as water reducer uniform mixing at room temperature again, promptly draws this soil solidification agent solution.
The present invention needs with reference to national standard i.e. " curing sub-surface and subbase technical regulation CJJ/T80-98 " and " highway pavement subgrade Design standard JTGD302004 " in use.
The present invention in use, with this solidifying agent according to 2/10000ths ratio and water dilution, evenly be sprayed in the soil of the scope of operation, mix again with the cement mix of 2-4% even, use 18 tons street roller compacting after, by the even spreading of stone flour of the every square of 2kg in surface, with the street roller hydrostatic profile, curing agent solution with the dilution of remainder is sprayed on the surface at last, through the series of physical chemical reaction process, stablizes persistent effect and reach soil solidification.
Outward appearance of the present invention is colourless, can select coloured interpolation staining agent to use as auxiliary material, and optional coloured interpolation staining agent has grey, red-purple, black, orange-yellow, blue look, brown etc.
In the present invention, after soil-solidified-agent and soil particle and small amount of cement uniform mixing, be rich in the acicular xln of mass crystallization and intert rapidly between the particle hole and to form the intensity skeleton.Form wadding fibrous colloid between Vltra tears (HPMC) and the grogs in composition part, help forming fast soil body mechanical structure; Main characteristic flocculence, water-retentivity, the emulsifying property binding property of the polyacrylamide (PAM) in forming under the effect of molecule part are brought into play, make that adsorptive power strengthens greatly between soil particle, and the free ability on monomer surface reduces; Sodium ion, silicon ion generation permutoid reaction in the calcium salt in the solidifying agent, magnesium salts, sylvite dissolving back and soil have further increased the agglomeration of soil particle.Can make the soil compaction effect stronger under the real state of defeating outside, compactness is bigger, and superpower bearing capacity and high water repellency are arranged afterwards.
React when composition part and the silicon oxide in the soil body, the aluminum oxide generation a series of " branch depolymerizes " of solidifying agent, form a large amount of hydrated calcium silicate gels, aquation sulphur, calcium aluminate etc.Form part also simultaneously with the cement that mixes in Calucium Silicate powder, tricalcium silicate, tricalcium aluminate, the reaction of compositions such as tetracalcium aluminoferrite is same to be formed.Hydrated calcium silicate gel is formed various calcium, silicon, iron, the aluminium isoreactivity composition of all right rapid extraction participation of the composition reaction in dividing.Not only strengthen cohesive force between the soil particle by this physical-chemical reaction, and the water glass of itself and the hydrated calcium silicate isogel of generation, can play the intergranular slit of filling soil to the full extent.
These several reaction process are not isolated, mutually intert but connect each other, by physical mechanics reaction, physical-chemical reaction, make soil body engineering property, barrier performance, weather resistance, solar heat protection freezing tolerance obtain huge improvement.
Beneficial effect: the present invention and traditional technology relatively have following advantage and practical significance:
1. scientific formulation is reasonable, and the starting material wide material sources are made simply, with low cost, stable and reliable for performance, and the intensity height, repellency is strong, the solar heat protection anti-freezing property is good;
2. many field multiple uses not only can be used as the processing of the steady layer of base water of motorway, Class I highway, and maximum advantage is to be directly used in the surface layer of sub-district road, country road, parkway, municipal administration, sightseeing sidewalk;
3. gather materials on the spot, need not to transport on-the-spot soil, no longer need a large amount of sandstone material, do not re-use cement, pitch as surface layer, saved laid down cost greatly, reduced atmospheric pollution, reduced and cut into a mountain for quarrying, having kept soil erosion, reduced environmental and ecological road original appearance, is to meet building a New Socialist Countryside, advocate demand that low-carbon economy builds a harmonious society.
In sum, the present invention has broken through the freeze proof core technology of waterproof, solved other at present on the market all soil-solidified-agents can only be applicable to road subbase course and basic unit, and can not be directly as the Application Areas of surface layer, market outlook are very wide, and it is widely used in also will produce huge social effect and economic benefit.
Embodiment
For technique means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
In embodiment one, under laboratory conditions:
According to " earthwork test rule ", get sieve back＜5mm soil sample 10kg, by the cement of mixing 4% 325 labels outward, press 1.2/10000ths of compound weight, mix suitable quantity of water and dilute and mix and stir, make the module of 50mm * 50mm.5 groups totally 50, detect according to " highway stabilized with inorganic binder testing of materials rules " operation and test, getting 3 for every group carries out, 7 days no lateral confinement intensity, on average reach more than the 3.51Mpa, the motorway design requirements, every grade get 3 at 28 days no lateral confinement intensity on average reaches 8.97Mpa, remaining 4 every group are carried out freezing and thawing test, do not have considerable change through the unconfined compression strength that 50 ℃ to-18 ℃ 18 times circulations are tested after soaked repeatedly, can find out that by following table this soil-solidified-agent resistance to compression index, water resistance and heat expansion-proof and cold shrinkage all are fabulous.
One group of intensity detection testing data
Case study on implementation 2, select 1200 squares on certain at village level road surface, southwest, engineering time is in June, 2010, this area's soil is weak swelling soil, change fill out and intractability very big, mix material proportioning is: soil-solidified-agent: cement: soil=0.013%: 5%: 95%, wherein, cement is No. 325 Portland cements, and plain soil is local hillside on-site soil.The pitch front cover is not adopted on the top layer; but it is anti-skidding to adopt little Guamishi to do the top layer; the ultimate compression strength that is detected by Chengdu highway authority measuring station is 3.8Mpa; flexure is 38, and this contrast uses traditional coagulating cement earth process only will save 180 tons in sandstone material, saves about 6 tons of cement consumptions; saved the consumption of partly transporting fuel oil; reduced emission of carbon-dioxide more than 6 tons, protected atmospheric environment, environment protection significance is not very not significantly.
Case study on implementation 3 is selected about 2000 squares altogether on the at village level road surface of ALFISOL IN CENTRAL, selects hot weather construction.Use this kind soil-solidified-agent to be total to 100kg by 1.2/10000ths, carry out compacting behind 4% the cement uniform mixing, every square of 2kg stone flour is spread on the surface, directly as surface layer, be completed in August, 2008, gets core ultimate compression strength in October, 2010 and be 8.5Mpa to the maximum, use surperficial so far intact no any crackle, vehicle pass-through is normal, and it is non-slip to rain, day fine ash that do not rise.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (3)
1. soil-solidified-agent that soil directly is treated as road deck, it is characterized in that, the per-cent of raw material and quality thereof is: water glass 50-60%, dehydrated alcohol 2-5%, polyacrylamide 5-10%, Walocel MT 20.000PV 5-10%, sodium hydroxide 8-15%, potassium hydroxide 8-15%, magnesium hydroxide 2-5%, Sodium Silicofluoride 2-5%, alum 2-5%, water reducer 2-5% etc., above-mentioned raw materials percentage ratio sum is 100%, its concrete procedure of processing is: heating unit is being housed, reflux exchanger, in the reactor of whipping appts with water glass, anhydrous diethyl ether, alum, Walocel MT 20.000PV, polyacrylamide, Sodium Silicofluorides etc. are heated to 80-100 ° of reaction down, with the composite copolymerization liquid cooling to 15-20 °, the liquid hydrogen sodium oxide of adding 99%, magnesium hydroxide, raw material stirring such as potassium hydroxide are even, reacted 1-2 hour, add practical high speed compound machines such as water reducer uniform mixing at room temperature again, promptly draw this soil solidification agent solution.
2. a kind of soil-solidified-agent that soil directly is treated as road deck according to claim 1, it is characterized in that, in use, the present invention according to 2/10000ths ratio and water dilution, evenly is sprayed in the soil of the scope of operation, mixes with the cement mix of 2-4% even again, after using 18 tons street roller compacting, by the even spreading of stone flour of the every square of 2kg in surface, with the street roller hydrostatic profile, the curing agent solution with the dilution of remainder is sprayed on the surface at last.
3. according to claim 1ly a kind of soil directly is treated as the soil-solidified-agent of road deck, it is characterized in that outward appearance of the present invention is colourless, can select coloured interpolation staining agent to use as auxiliary material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010557635.3A CN102031119B (en) | 2010-11-25 | 2010-11-25 | Soil curing agent directly processing soil into surface layer of road |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010557635.3A CN102031119B (en) | 2010-11-25 | 2010-11-25 | Soil curing agent directly processing soil into surface layer of road |
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| CN102031119A true CN102031119A (en) | 2011-04-27 |
| CN102031119B CN102031119B (en) | 2014-06-04 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643652A (en) * | 2012-04-17 | 2012-08-22 | 重庆融极环保工程有限公司 | High osmosis type soil hardener and application method thereof |
| CN102690099A (en) * | 2012-06-15 | 2012-09-26 | 新疆惠森生物技术有限公司 | Application of soil hardener in wall body building of greenhouse |
| CN106190159A (en) * | 2016-07-28 | 2016-12-07 | 甘肃鑫业环保科技有限公司 | A kind of soil additive that clay solidifying is become Ecological Road and preparation technology thereof |
| CN106244164A (en) * | 2016-08-11 | 2016-12-21 | 洛阳名力科技开发有限公司 | A kind of liquid soil-solidified-agent |
| CN107151957A (en) * | 2017-03-24 | 2017-09-12 | 广东省建筑科学研究院集团股份有限公司 | A kind of Tourism Ecological road of utilization soil body solidification, rural road pavement structure |
| CN107502369A (en) * | 2017-09-20 | 2017-12-22 | 任运（北京）科技有限公司 | Soil-solidified-agent that reclamation and treatment of soft foundation use and preparation method thereof |
| CN108165273A (en) * | 2017-12-26 | 2018-06-15 | 洛阳神佳窑业有限公司 | A kind of liquid soil-solidified-agent |
| CN108178551A (en) * | 2018-01-03 | 2018-06-19 | 东莞市粤惠建筑工程技术咨询有限公司 | A kind of special ground curing agent of civil engineering and preparation method thereof |
| CN109053096A (en) * | 2018-10-26 | 2018-12-21 | 长春工程学院 | A kind of Soda saline and alkaline soils are freeze proof to split type curing agent |
| CN112876190A (en) * | 2021-02-03 | 2021-06-01 | 中科聚垚环保新材料科技有限公司 | Novel fiber-cured road surface layer mixture and preparation method thereof |
| CN115109597A (en) * | 2022-07-21 | 2022-09-27 | 西安墙体材料研究设计院有限公司 | Soil curing agent and preparation and use methods thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004043275A (en) * | 2002-05-14 | 2004-02-12 | Mitsubishi Shoji Construction Materials Corp | Curing retarder, curing retardation method of hydraulic solidifying material and curing retardation method of improved soil |
| CN1884182A (en) * | 2006-07-07 | 2006-12-27 | 邓桂云 | Civil engineering materials curing agent and preparation method thereof |
| CN101481238A (en) * | 2009-02-18 | 2009-07-15 | 西北农林科技大学 | Green soil curing agent |
-
2010
- 2010-11-25 CN CN201010557635.3A patent/CN102031119B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004043275A (en) * | 2002-05-14 | 2004-02-12 | Mitsubishi Shoji Construction Materials Corp | Curing retarder, curing retardation method of hydraulic solidifying material and curing retardation method of improved soil |
| CN1884182A (en) * | 2006-07-07 | 2006-12-27 | 邓桂云 | Civil engineering materials curing agent and preparation method thereof |
| CN101481238A (en) * | 2009-02-18 | 2009-07-15 | 西北农林科技大学 | Green soil curing agent |
Non-Patent Citations (1)
| Title |
|---|
| 陈胜等: "高性能土壤固化剂的制备与性能", 《硅酸盐通报》 * |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643652A (en) * | 2012-04-17 | 2012-08-22 | 重庆融极环保工程有限公司 | High osmosis type soil hardener and application method thereof |
| CN102643652B (en) * | 2012-04-17 | 2014-05-07 | 重庆融极环保工程有限公司 | High osmosis type soil hardener and application method thereof |
| CN102690099A (en) * | 2012-06-15 | 2012-09-26 | 新疆惠森生物技术有限公司 | Application of soil hardener in wall body building of greenhouse |
| CN102690099B (en) * | 2012-06-15 | 2013-08-07 | 新疆惠森生物技术有限公司 | Application of soil hardener in wall body building of greenhouse |
| CN106190159A (en) * | 2016-07-28 | 2016-12-07 | 甘肃鑫业环保科技有限公司 | A kind of soil additive that clay solidifying is become Ecological Road and preparation technology thereof |
| CN106244164A (en) * | 2016-08-11 | 2016-12-21 | 洛阳名力科技开发有限公司 | A kind of liquid soil-solidified-agent |
| CN107151957A (en) * | 2017-03-24 | 2017-09-12 | 广东省建筑科学研究院集团股份有限公司 | A kind of Tourism Ecological road of utilization soil body solidification, rural road pavement structure |
| CN107502369A (en) * | 2017-09-20 | 2017-12-22 | 任运（北京）科技有限公司 | Soil-solidified-agent that reclamation and treatment of soft foundation use and preparation method thereof |
| CN108165273A (en) * | 2017-12-26 | 2018-06-15 | 洛阳神佳窑业有限公司 | A kind of liquid soil-solidified-agent |
| CN108178551A (en) * | 2018-01-03 | 2018-06-19 | 东莞市粤惠建筑工程技术咨询有限公司 | A kind of special ground curing agent of civil engineering and preparation method thereof |
| CN109053096A (en) * | 2018-10-26 | 2018-12-21 | 长春工程学院 | A kind of Soda saline and alkaline soils are freeze proof to split type curing agent |
| CN109053096B (en) * | 2018-10-26 | 2021-06-01 | 长春工程学院 | Anti-frost-cracking curing agent for soda saline-alkali soil |
| CN112876190A (en) * | 2021-02-03 | 2021-06-01 | 中科聚垚环保新材料科技有限公司 | Novel fiber-cured road surface layer mixture and preparation method thereof |
| CN115109597A (en) * | 2022-07-21 | 2022-09-27 | 西安墙体材料研究设计院有限公司 | Soil curing agent and preparation and use methods thereof |
| CN115109597B (en) * | 2022-07-21 | 2024-03-22 | 西安墙体材料研究设计院有限公司 | Soil curing agent and preparation and use methods thereof |
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| CN102031119B (en) | 2014-06-04 |
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