CN103193456A - Phosphate curing agent for soft soil foundation and preparation method of phosphate curing agent - Google Patents
Phosphate curing agent for soft soil foundation and preparation method of phosphate curing agent Download PDFInfo
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- CN103193456A CN103193456A CN201310118252XA CN201310118252A CN103193456A CN 103193456 A CN103193456 A CN 103193456A CN 201310118252X A CN201310118252X A CN 201310118252XA CN 201310118252 A CN201310118252 A CN 201310118252A CN 103193456 A CN103193456 A CN 103193456A
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Abstract
The invention belongs to the field of civil engineering materials and building foundation treatment technologies, and particularly relates to a phosphate curing agent for a soft soil foundation and a preparation method of the phosphate curing agent. The curing agent mainly comprises the following four components by mass percent: 20 to 60% of gel component, 20 to 40% of sintered active magnesium oxide, 0.1 to 5% of retarder and 20 to 40% of expansion component. When in use, the curing agent and the soft soil are directly uniformly mixed by a deep mixing method, wherein 10 to 15% of curing agent is added; after such curing agent is added to the soft soil, the cured soil shows relatively high early strength; the curing agent is very applicable to the foundation treatment process with strict requirement on the construction period or the foundation treatment process meeting tight deadline; simultaneously, the final strength completely meets the demands of the foundation treatment processes such as the foundation of an express way.
Description
Technical field
The invention belongs to civil engineering material and building lot processing technology field, be specifically related to the novel phosphoric acid salt soft soil curing agent of a kind of reinforced soft soil ground and processing.
Background technology
Soft clay ground generally refers to the saturated cohesive soil that deposits in hydrostatic or slow-flowing stream environment, and often accompany peat, shell and biological remains, characteristics such as have that natural moisture content and void ratio are big, bad hydraulic permeability, compressibility height, slip resistance are low, shake-up property and creep properties are big.On the other hand, China has some civil engineering work projects to have to be based upon on the soft clay ground at present, therefore treatment of soft foundation is directly affected the quality of civil engineering work project.The normal a kind of method that adopts was solidification treatment during ground was handled, but the engineering pessimum of weak soil has increased the difficulty of soft clay ground solidification treatment.
At present, on the engineering usually with cement or lime etc. as groundwork firming agent for soft soil, adopt direct paddling process reinforcing soft soil foundation or similar ground.When adopting these solidifying agent to solidify weak soil, because the resultant that solidified earth produces can not satisfy the particular requirement of hydrate kind and quantity, causes cost higher, and water-fast poor with salt tolerance, curing age needed 14 days even the longer time, may cause nervous and work holdup phenomenon of duration; In addition, these solidifying agent can not satisfy the demand of the Harmony aspect of different hydrate formation speeds, and the intensity that causes solidifying weak soil can't guarantee that consolidation effect is undesirable, may not reach the requirement of construction quality.Therefore develop that solidification effect has early strengthening and high strengthening, the construction period is short, the simple soft soil curing agent of constructional method is significant.
Summary of the invention
The objective of the invention is from preparation raw material angle, provides a kind of novel phosphoric acid salt soft soil curing agent for solving the prior art deficiency.The main component of this groundwork firming agent for soft soil comprises phosphate component, sintering activity magnesium oxide, retardant, swelling property component.Wherein two kinds of component reaction of phosphate component and sintering activity magnesium oxide can generate the gelling hydrated product, can make it into as a whole with the weak soil granular cementation in the soft clay ground to together; Retardant plays the effect of reaction speed, so that construction; The swelling property component during aquation, can produce the hydrated product that solid volume expands in weak soil, be filled in the hole of weak soil, reduces the porosity of weak soil, increases degree of compactness, improves the intensity of solidifying weak soil.
A kind of phosphoric acid salt groundwork firming agent for soft soil is characterized in that: solidifying agent specifically comprises following four kinds of components:
1). phosphate component: adopt a kind of in following two kinds of materials: (1) disodium hydrogen phosphate; (2) ten phosphate dihydrate trisodiums; Consumption is to account for 20% ~ 60% of solidifying agent total mass;
2). sintering activity magnesium oxide: by magnesium hydroxide temperature lower calcination 1-3 hour at 950 ℃ ~ 1050 ℃, after normal temperature cooling, break process, levigately be not less than 300m to specific surface area
2/ kg, median size＜2 micron and make, consumption is to account for 20% ~ 40% of solidifying agent total mass;
3). retardant: adopt a kind of in following four kinds of materials: (1) tripoly phosphate sodium STPP, incorporation accounts for 0.1% ~ 0.3% of solidifying agent total mass; (2) borax, incorporation account for 1% ~ 5% of solidifying agent total mass; (3) citric acid, incorporation account for 0.05% ~ 0.2% of solidifying agent total mass; (4) polyvinyl alcohol, incorporation account for 0.05% ~ 0.3% of solidifying agent total mass;
4). swelling property component: adopt a kind of in following two kinds of materials: (1) aluminosulfate cement, incorporation accounts for 20% ~ 40% of solidifying agent total mass; (2) aluminate cement, incorporation account for 20% ~ 40% of solidifying agent total mass.
More specifically, wherein solidifying agent specifically comprises following four kinds of components:
1. phosphate component: adopt a kind of in following two kinds of materials: (1) disodium hydrogen phosphate; (2) ten phosphate dihydrate trisodiums.The specification of quality of these two kinds of materials should be distinguished the above standard of technical grade among conformance with standard HG/T2767-1996 and the HG/T2517-93, and consumption is to account for 20% ~ 60% of solidifying agent total mass.
2. sintering activity magnesium oxide: by magnesium hydroxide temperature lower calcination 1-3 hour at 950 ℃ ~ 1050 ℃, after normal temperature cooling, break process, levigately be not less than 300m to specific surface area
2/ kg, median size＜2 micron and make, consumption is to account for 20% ~ 40% of solidifying agent total mass.
3. retardant: adopt a kind of in following four kinds of materials: (1) commercially available industrial tripoly phosphate sodium STPP, the specification of quality of conformance with standard GB9983-2004, incorporation account for 0.1% ~ 0.3% of solidifying agent total mass; (2) technical grade borax meets the above specification of quality of acceptable end product among the industrial ten hydration disodium tetraborate standard GB-T537-1997, and incorporation accounts for 1% ~ 5% of solidifying agent total mass; (3) commercially available citric acid meets the specification of quality of citric acid standard GB/T 8269-2006, and incorporation accounts for 0.05% ~ 0.2% of solidifying agent total mass; (4) polyvinyl alcohol meets the above polyvinyl alcohol material product performance index requirement of salable product among plastic polyethylene alcohol material the 3rd part specification standards GB/T12010.3-2010, and incorporation accounts for 0.05% ~ 0.3% of solidifying agent total mass.
4. swelling property component: adopt a kind of in following two kinds of materials: (1) commercially available strength grade is the quick hardening sulphoaluminate cement of 42.5-72.5, meets the requirement among the aluminosulfate cement standard GB20472-2006, and incorporation accounts for 20% ~ 40% of solidifying agent total mass; (2) commercially available cement type is the aluminate cement of CA-50-CA-80, meets the requirement of aluminate cement standard GB201-2000, and incorporation accounts for 20% ~ 40% of solidifying agent total mass.
The preparation method of this solidifying agent is: 1) sintering activity magnesium oxide, two kinds of components of retardant are mixed, be called mixture A; 2) cementing properties component, two kinds of components of swelling property component are mixed, be called mixture B; 3) after being mixed, mixture A and B make solidifying agent.
Directly adopt deep mixing method and weak soil to mix when this solidifying agent uses, the incorporation of solidifying agent is the 10%-15% of Udoll quality.
Advantage of the present invention
Beneficial effect: by a large amount of experiments, compare with the prior art scheme, adopt the beneficial effect that this novel phosphoric acid salt soft soil curing agent solidifies weak soil to be:
1, early strength height.Found through experiments, adopt very fast that early strength that this solidifying agent solidifies weak soil promotes, the 3d of solidified earth does not have side line ultimate compression strength and all is equivalent to more than 80% of 28d intensity.And existing solidified earth treatment technology, solidified earth needs 14d even longer curing age just can reach the engineering strength requirement, and the engineering curing condition that has is very strict, take time and effort, therefore soft soil curing agent of the present invention is highly suitable for the duration is had in the foundation treatment engineering of being strict with or working to tight deadlines.
2, quality is good.It is better that this solidifying agent solidifies the weak soil effect, can reach the engine request that solidifies weak soil.In the technical program, it is 10% ~ 15% solidifying agent of the present invention by admixture massfraction in weak soil, the hydrated product that generates plays binder soil particle and skeleton function in solidified earth, make solidified earth form fine and close skeleton structure, and water stability is very good, and is more effective than existing solidified earth treatment technology.
Embodiment
Table 1 weak soil physical mechanical property index
(1) material
In the natural weak soil in certain Beijing and the experiment of strand, Tianjin blowing-filling sludge solidification treatment, utilize the soil sample of two kinds of different moisture contents of the soft dry ground preparation in Beijing, the physical mechanical property index of Beijing weak soil soil sample and Tianjin blowing-filling sludge soil sample is as shown in table 1.
It is as follows to prepare the used starting material of solidifying agent:
Reactive sintering MgO: company limited provides by the prosperous Yao magnesium in Yingkou industry, and calcining temperature is 950 ℃, and the MgO total content is greater than 90%, loss on ignition 4%, specific surface area 310m
2/ kg.
Sodium phosphate dibasic: provided by Qingzhou City Jin Hui chemical plant, packed, every bag of 50kg, effective content meet HG/T2767-1996 technical grade standard greater than 98%.
Tertiary sodium phosphate: company limited provides by Qingzhou City rising sun profit chemical industry, and is packed, every bag of 50kg, Na
3PO
412H
2O content is greater than 98%, and quality meets the technical grade standard-required of HG/T2517-93.
Tripoly phosphate sodium STPP: company limited provides by the prosperous victory chemical industry of Qingzhou City, packed (every bag of 50kg), Na
5P
3O
10Content is greater than 95%, and quality meets the requirement of GB9983-2004.
Aluminosulfate cement: the strength grade of being built Wen Tecai Science and Technology Ltd. and being provided by the Zhengzhou City is 42.5,52.5,62.5,72.5 quick hardening sulphoaluminate cement, and quality product meets GB20472-2006 cement national standard.
Aluminate cement: provided by Beijing Ao Ming Science and Technology Ltd., product type comprises CA-50, CA-60, CA-70, CA-80, meets the specification of quality of GB201-2000.
Borax: permanent Mei Ke commerce trading center far away provides by Beijing, meets GB-T537-1997 acceptable end product specification of quality.
Citric acid: company limited provides by the safe rich great chemical industry in Beijing, and is packed, and every bag of 25kg meets the specification of quality of GB/T 8269-2006.
Polyvinyl alcohol: containing safe material of construction company limited by the Hong Tong county provides, and white powder meets the performance requriements of salable product among the GB/T12010.3-2010.
(2) experimental procedure
1) according to experiment proportioning weighing soil sample and solidifying agent, pour in the agitator kettle, start stirrer, the stirrer model is the UJZ-15 type, and whipping process is controlled automatically by stirrer.
2) sample that stirs is divided 3 layers of 50 * 50 * 50mm that packs into
3In the die trial, vibrate 1min, moulding at ZT-1 * 1 type plain bumper.
3) specimen molding form removal after 1 day will have been taken off the test block of mould and sent into maintenance in the SYH-40Q type standard mortar maintaining box, and curing temperature is 20 ± 2 ℃, maintenance humidity 〉=95%, and maintenance is to the required length of time.
4) measure the correspondence unconfined compression strength in the length of time respectively.
(3) proportioning raw materials and solidified earth intensity
Solidifying agent proportioning and cure test result are shown in following table 2,3,4,5,6.Wherein in the table 2, the solidifying agent incorporation is 10%, and the weak soil that is cured is BT1; In the table 3, the solidifying agent incorporation is 10%, and the weak soil that is cured is BT1; In the table 4, the solidifying agent incorporation is 10%, and the weak soil that is cured is BT2; In the table 5, the solidifying agent incorporation is 15%, and the weak soil that is cured is TT; In the table 6, the solidifying agent incorporation is 15%, and the weak soil that is cured is BT1.The solidified earth experiment is all carried out according to highway earthwork test rule (JTG E40-2007) and highway engineering stabilized with inorganic binder testing of materials rules (JTG E51-2009).
Table 2 phosphate firming agent solidifies BT1 and cooperates experimental result when
Table 3 phosphate firming agent solidifies BT1 and cooperates experimental result when
Table 4 phosphate firming agent solidifies BT2 and cooperates experimental result when
Table 5 phosphate firming agent solidifies TT and cooperates experimental result when
Table 6 phosphate firming agent solidifies BT1 and cooperates experimental result when
From table 2,3,4,5 as can be seen, solidified earth has very high early strength, and the ultimate compression strength of 1d can reach more than 50% of 28d ultimate compression strength, and what have can reach 70%, such as the 9th group; The ultimate compression strength of 3d reaches more than 80% of 28d intensity.Sintering activity magnesium oxide not only can keep the required PH condition of aquation resultant of environment in the solidified earth as basic component, and can be used as the required reactant of resultant, puies forward the intensity of solidified earth.Under the situation of identical reactive sintering MgO volume, along with the also raising thereupon of increase solidified earth intensity of Sodium phosphate dibasic or tertiary sodium phosphate volume; The ratio of Sodium phosphate dibasic and active MgO increases on the whole, and the ultimate compression strength of solidified earth increases afterwards earlier and reduces.The NaMgPO47H that generates in the solidified earth
2O plays cementation, is in the same place with soil particle and active MgO granular cementation, forms fine and close skeleton structure.When phosphoric acid salt accounts for the ratio of reactive sintering MgO when excessive, because hydrated product does not need too much Mg
2+, this moment, magnesium oxide mainly played the effect that keeps reaction PH alkaline environment in the solidified earth, and intensity can not correspondingly be improved.In addition, the swelling property component as aluminosulfate cement or aluminate cement, not only can generate products such as causing AFt that solidified earth improves or AFm, and these products often have certain cementing properties and swelling property in the process that constantly generates, and make the solidified earth internal structure more fine and close.Simultaneously also as can be seen the minimum ultimate compression strength of 28d be 2.90MPa, high compressive strength is 3.65MPa, satisfies the needs of foundation treatment engineering such as motorway fully.
Claims (3)
1. phosphoric acid salt groundwork firming agent for soft soil, it is characterized in that: solidifying agent specifically comprises following four kinds of components:
1). phosphate component: adopt a kind of in following two kinds of materials: (1) disodium hydrogen phosphate; (2) ten phosphate dihydrate trisodiums; Consumption is to account for 20% ~ 60% of solidifying agent total mass;
2). sintering activity magnesium oxide: by magnesium hydroxide temperature lower calcination 1-3 hour at 950 ℃ ~ 1050 ℃, after normal temperature cooling, break process, levigately be not less than 300m to specific surface area
2/ kg, median size＜2 micron and make, consumption is to account for 20% ~ 40% of solidifying agent total mass;
3). retardant: adopt a kind of in following four kinds of materials: (1) tripoly phosphate sodium STPP, incorporation accounts for 0.1% ~ 0.3% of solidifying agent total mass; (2) borax, incorporation account for 1% ~ 5% of solidifying agent total mass; (3) citric acid, incorporation account for 0.05% ~ 0.2% of solidifying agent total mass; (4) polyvinyl alcohol, incorporation account for 0.05% ~ 0.3% of solidifying agent total mass;
4). swelling property component: adopt a kind of in following two kinds of materials: (1) aluminosulfate cement, incorporation accounts for 20% ~ 40% of solidifying agent total mass; (2) aluminate cement, incorporation account for 20% ~ 40% of solidifying agent total mass.
2. the preparation method of a kind of phosphoric acid salt groundwork firming agent for soft soil according to claim 1 is characterized in that step is as follows: 1) sintering activity magnesium oxide, two kinds of components of retardant are mixed, be called mixture A; 2) cementing properties component, two kinds of components of swelling property component are mixed, be called mixture B; 3) after being mixed, mixture A and B make solidifying agent.
3. the application of a kind of phosphoric acid salt groundwork firming agent for soft soil according to claim 1 is characterized in that: directly adopt deep mixing method and weak soil to mix when solidifying agent uses, the incorporation of solidifying agent is the 10%-15% of Udoll quality.
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| CN201310118252XA CN103193456A (en) | 2013-04-07 | 2013-04-07 | Phosphate curing agent for soft soil foundation and preparation method of phosphate curing agent |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103289703A (en) * | 2013-07-05 | 2013-09-11 | 浙江工业大学 | Early-strength soil solidifying agent and manufacturing method and application for same |
| CN105834206A (en) * | 2016-03-28 | 2016-08-10 | 北京中岩大地科技股份有限公司 | Treatment method of contaminated soil |
| CN115849773A (en) * | 2022-08-10 | 2023-03-28 | 河南土化石环保建材有限公司 | Soil curing agent and preparation method thereof |
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| CN101250041A (en) * | 2008-03-05 | 2008-08-27 | 杨毅男 | Environment-friendly type soil curing agent |
| CN101275394A (en) * | 2008-04-28 | 2008-10-01 | 北京航空航天大学 | Curing method for saline soil |
| CN102390943A (en) * | 2011-07-27 | 2012-03-28 | 中国科学院青海盐湖研究所 | Magnesium phosphate cement prepared by using magnesium oxide byproduct in process of extracting lithium carbonate from salt lake |
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2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250041A (en) * | 2008-03-05 | 2008-08-27 | 杨毅男 | Environment-friendly type soil curing agent |
| CN101275394A (en) * | 2008-04-28 | 2008-10-01 | 北京航空航天大学 | Curing method for saline soil |
| CN102390943A (en) * | 2011-07-27 | 2012-03-28 | 中国科学院青海盐湖研究所 | Magnesium phosphate cement prepared by using magnesium oxide byproduct in process of extracting lithium carbonate from salt lake |
Non-Patent Citations (1)
| Title |
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| 李悦 等: ""一种新型软土固化剂及其固化机理研究"", 《市政技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103289703A (en) * | 2013-07-05 | 2013-09-11 | 浙江工业大学 | Early-strength soil solidifying agent and manufacturing method and application for same |
| CN105834206A (en) * | 2016-03-28 | 2016-08-10 | 北京中岩大地科技股份有限公司 | Treatment method of contaminated soil |
| CN115849773A (en) * | 2022-08-10 | 2023-03-28 | 河南土化石环保建材有限公司 | Soil curing agent and preparation method thereof |
| CN115849773B (en) * | 2022-08-10 | 2024-02-13 | 河南土化石环保建材有限公司 | Soil curing agent and preparation method thereof |
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Application publication date: 20130710 |