CN103979914A - Curing agent for reinforcing and treating soft soil foundation constructed at low temperature and preparation method thereof - Google Patents
Curing agent for reinforcing and treating soft soil foundation constructed at low temperature and preparation method thereof Download PDFInfo
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- CN103979914A CN103979914A CN201410218480.9A CN201410218480A CN103979914A CN 103979914 A CN103979914 A CN 103979914A CN 201410218480 A CN201410218480 A CN 201410218480A CN 103979914 A CN103979914 A CN 103979914A
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Abstract
The invention relates to a curing agent for reinforcing and treating a soft soil foundation constructed at a low temperature and a preparation method thereof. The curing agent comprises the following components: (1) aluminate cement or sulphate aluminum cement; (2) flue gas desulfurization gypsum; (3) silicate cement; (4) quick lime; (5) a thickening time control agent; and (6) a filling material. The filling material is coal ash, mineral slag or steel slag. The soft oil curing agent has the characteristics of short setting time, quick strength development and micro-expansion of solidified soil in volume in a low-temperature environment. After curing for 1 day, main strength is formed, so that the curing agent is particularly suitable for reinforcing and treating soft oil constructed in a low-temperature environment, and preferably, the use level of the soft soil curing agent is 10-15wt% of the reinforcing soil body. Compared with the prior art, severe burden to the environment and treatment expenses as solid wastes such as flue gas desulfurization gypsum, coal ash, mineral slag and the like are not utilized can be alleviated while the product performance is guaranteed.
Description
Technical field
The invention belongs to new material technology, environmental protection and energy saving technical field, relate to the utilizations of solid waste such as desulfurated plaster, flyash, slag and solidifying agent of a kind of low-temperature construction reinforced soft soil ground and processing and preparation method thereof.
Background technology
Reinforcement of soft soil method because the economic benefit that possesses skills is high, to environment have no adverse effects, the advantage such as easy construction, in China's soft clay area development rapidly, now be widely used in industry and gone along with sb. to guard him engineering with covil construction foundation stabilization, road foundation reinforcing, river dyke antiseepage, impervious reinforcing and deep pit digging, and developed to the aspect such as seabed weak soil and the reinforcing of dredging earth of port construction, offshore engineering.The reinforcement principle of conventional reinforcement of soft soil method (deep mixing method, high-pressure rotary spraying method and cement mix local method) is all that solidifying agent and weak soil are are fully mixed and stirred, utilize the series of physical, the chemical reaction that between solidifying agent and weak soil, occur, weak soil is hardened into have the solidified earth of globality, water stability and some strength.
Solidifying agent decapacitation makes weak soil have beyond some strength at varying environment temperature, also must be containing swelling property hydrated product, the volumetric expansion of this hydrate forming process can will be pushed, fill mass of soil intragranular pore, and solidified earth intensity is increased substantially, and avoids occurring shrinkage crack.The solidifying agent using mostly at present is silicate cement and lime-flyash (two-ash soil).But silicate cement is during as soft soil curing agent, can not effectively fill the hole in solidified earth, has limited the raising of solidified earth intensity; And solidification effect is subject to the restriction of soil class, to the high clay of plasticity index, to split soil, organophilic clay and saline soil solidification effect undesirable.In addition, cannot adjust because of the first final setting time of silicate cement, especially under low temperature environment, (for example, at-5 DEG C ~ 5 DEG C) are long its time of coagulation, limited engineering progress; Later stage dry shrinkage is larger, easy to crack.Two-ash soil epistasis morning is in actual use poor, and due to flyash self character, makes the water stability of two-ash soil poor.If a certain amount of swelling property component of admixture forms compound solidifying agent in silicate cement, thereby swelling property hydrate can effectively be filled solidified earth mesoporosity solidified earth intensity is significantly improved.But at present about the optimum proportion between each swelling property component, swelling property component, totally the optimum proportion in soft soil curing agent and definite method thereof it be unclear that.
Summary of the invention
The object of the invention is the defect in order to overcome above-mentioned prior art existence and solidifying agent of a kind of low-temperature construction reinforced soft soil ground and processing and preparation method thereof is provided, described solidifying agent is in ensureing product performance, can utilize the free water content in the material consumption soil that generates high crystal water, the gelling with high crystal water and the crystalline substance that generate, can stop up the various capillary channels in the soil body, avoid infiltrating moisture and again destroy the structure of solidified earth.The microcrystals containing in solidifying agent, be equipped with by lattice, can in soil particle space, generate acicular crystals, fill soil body gap, form skeleton structure (three-dimensional space net structure), improve mechanical strength and the performance index such as impervious of the soil body, even if also can fully ensure the properties of the soil body under low temperature environment.
A kind of low-temperature construction reinforced soft soil ground that the present invention proposes and the solidifying agent of processing, be made up of aluminate cement or aluminosulfate cement, desulfurated plaster, silicate cement, unslaked lime, adjustable solidification agent and packing material, and the weight percent of each component is:
Weight percentages
Aluminate cement or aluminosulfate cement 30%～40%;
Desulfurated plaster 20%～30%;
Silicate cement 10%～15%;
Unslaked lime 3%～5%;
Retardant 0.5%～2%;
All the other are packing material, and its gross weight meets 100%.
In the present invention, described aluminate cement is CA-50 or CA-70 level aluminate cement; Aluminosulfate cement is 72.5R level aluminosulfate cement; Silicate cement is P II 52.5R level silicate cement.
In the present invention, retardant is any in glucose, starch, Sodium hexametaphosphate 99, ligninsulfonate or Trisodium Citrate.
In the present invention, the consumption of described soft soil curing agent is 10%～15% of soil mass consolidation weight.
In the present invention, described soft soil curing agent condenses in 60 minutes at 5 DEG C, and 1 d can bring into play more than 50% mechanical strength, and the curing soil body later stage do not shrink, in the soil body, there is not shrinkage crack.
The preparation method of a kind of low-temperature construction reinforced soft soil ground that the present invention proposes and the solidifying agent of processing, concrete steps are: after weighing according to part by weight, first utilizing mixing rate is that the mixing machine of 50～150 r/min mixes aluminate cement or aluminosulfate cement, desulfurated plaster, silicate cement, unslaked lime, adjustable solidification agent, then in above-mentioned mixing machine, said mixture and packing material are mixed together evenly, obtain desired product.
After the solidifying agent the present invention relates to mixes with the soil body, on the one hand, in solidifying agent, desulfurated plaster reacts with the anhydrous calcium sulphoaluminate in calcium aluminate or aluminosulfate cement in aluminate cement, generate rapidly high in conjunction with water and there is swelling property hydrate ettringite, not only can fill mass of soil vinterparticle pore in solidified earth, can fill again mass of soil grain internal void, make up hydrated calcium silicate gel under low temperature environment and developed slow deficiency, make the soil body under low temperature environment also there is strength development faster; In addition, silicate cement also can progressively generate hydrated calcium silicate gel, calcium hydroxide and ettringite.Because generally also containing part aluminium matter component in the soil body, therefore the forming section of ettringite is the interaction due to calcium hydroxide and the soil body under vitriol effect again.This reaction makes hydroxide flake calcium be converted into the ettringite of needle bar shape on the one hand, is conducive to the raising of solidified earth intensity; Meanwhile, strengthen the connection between the soil body and cement skeleton, greatly increased water stability and the intensity of solidified earth.On the other hand, make later strength be able to sustainable development adding of flyash equal industrial residue.On the whole, this solidifying agent has effectively been brought into play the characteristic of silicate cement main hydration products hydrated calcium silicate gelling, combines again fast solidifying, the strong and microdilatancy effect early of the hydrated products such as ettringite.
Compared with prior art, the present invention effectively combines the performance advantage of silicate cement and aluminate cement (or aluminosulfate cement), fully ensure the time of coagulation of the soil body under low temperature environment, strength development and later stage micro-expansibility, there is stronger Modulatory character.In addition, fully utilize and utilized the solid waste such as desulfurated plaster, flyash, in ensureing product performance, can alleviate these solid waste owing to not being utilized serious burden and processing costs that environment is caused, there is good economic and social benefit.
This low-temperature construction soft soil curing agent performance requriements is as shown in table 1:
The performance requriements of table 1 low temperature (0 DEG C) construction soft soil curing agent
| Project | Performance |
| Presetting period, min | ≤60 |
| Final setting time, min | ≤120 |
| 1 d ultimate compression strength, MPa | ≥15.0 |
| 3 d ultimate compression strength, MPa | ≥25.0 |
| 28 d size changing rates, % | ≤0.03 |
In sum, this low temperature soft soil curing agent production process is simple, and each performance index are good, quality is easy to control, applied widely, is convenient under cold condition especially large-scale promotion application in winter.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1
The main raw material(s) of solidifying agent has aluminate cement 30%, desulfurated plaster 30%, silicate cement 15%, unslaked lime 5%, glucose 1%, flyash 19%.Clay (silt) to be reinforced at 105 DEG C dry 24 hours in advance, and be crushed to all by 3mm round hole sieve with rubber mallet.The consumption of solidifying agent is 10% of soil mass consolidation weight, and water-cement ratio is 0.5.Through being uniformly mixed the latter made test specimen of body, respectively 5 DEG C and 20 DEG C of maintenances, the performance of the reinforcing clay that during to the regulation length of time, test obtains is as shown in table 2.
The table 2 low-temperature construction soft soil curing agent gained of filling a prescription is reinforced the performance test results of clay
| Project | Test result |
| Presetting period (5 DEG C), min | 25 |
| Final setting time (5 DEG C), min | 45 |
| 1 d ultimate compression strength (5 DEG C), MPa | 0.8 |
| 3 d ultimate compression strength (5 DEG C), MPa | 1.5 |
| 28 d size rate of expansion (5 DEG C), % | 0.018 |
| Presetting period (20 DEG C), min | 18 |
| Final setting time (20 DEG C), min | 27 |
| 1 d ultimate compression strength (20 DEG C), MPa | 2.1 |
| 3 d ultimate compression strength (20 DEG C), MPa | 2.9 |
| 28 d size rate of expansion (20 DEG C), % | 0.010 |
Embodiment 2
Main raw material(s) has aluminosulfate cement 40%, desulfurated plaster 30%, silicate cement 10%, unslaked lime 3%, sucrose 2%, slag 19%.Clay (silt) to be reinforced at 105 DEG C dry 24 hours in advance, and be crushed to all by 3mm round hole sieve with rubber mallet.The consumption of solidifying agent is 15% of soil mass consolidation weight, and water-cement ratio is 0.5.Through being uniformly mixed the latter made test specimen of body, respectively 5 DEG C and 20 DEG C of maintenances, the performance of the reinforcing clay that during to the regulation length of time, test obtains is as shown in table 2.
Table 2 low-temperature construction soft soil curing agent two gained of filling a prescription are reinforced the performance test results of clays
| Project | Test result |
| Presetting period (5 DEG C), min | 23 |
| Final setting time (5 DEG C), min | 44 |
| 1 d ultimate compression strength (5 DEG C), MPa | 1.1 |
| 3 d ultimate compression strength (5 DEG C), MPa | 1. 9 |
| 28 d size rate of expansion (5 DEG C), % | 0.023 |
| Presetting period (20 DEG C), min | 18 |
| Final setting time (20 DEG C), min | 30 |
| 1 d ultimate compression strength (20 DEG C), MPa | 2.9 |
| 3 d ultimate compression strength (20 DEG C), MPa | 3.7 |
| 28 d size rate of expansion (20 DEG C), % | 0.013 |
Embodiment 3
Main raw material(s) has aluminosulfate cement 35%, desulfurated plaster 20%, silicate cement 10%, unslaked lime 3%, ligninsulfonate 1%, slag 20%.Clay (silt) to be reinforced at 105 DEG C dry 24 hours in advance, and be crushed to all by 3mm round hole sieve with rubber mallet.The consumption of solidifying agent is 13% of soil mass consolidation weight, and water-cement ratio is 0.5.Through being uniformly mixed the latter made test specimen of body, respectively 5 DEG C and 20 DEG C of maintenances, the performance of the reinforcing clay that during to the regulation length of time, test obtains is as shown in table 3.
Table 3 low-temperature construction soft soil curing agent three gained of filling a prescription are reinforced the performance test results of clays
| Project | Test result |
| Presetting period (5 DEG C), min | 28 |
| Final setting time (5 DEG C), min | 50 |
| 1 d ultimate compression strength (5 DEG C), MPa | 0.9 |
| 3 d ultimate compression strength (5 DEG C), MPa | 1. 6 |
| 28 d size rate of expansion (5 DEG C), % | 0.017 |
| Presetting period (20 DEG C), min | 20 |
| Final setting time (20 DEG C), min | 37 |
| 1 d ultimate compression strength (20 DEG C), MPa | 2.5 |
| 3 d ultimate compression strength (20 DEG C), MPa | 3.2 |
| 28 d size rate of expansion (20 DEG C), % | 0.009 |
From above embodiment, this soft soil curing agent can be prepared according to the temperature of practice of construction environment the solidifying agent of different intensity grades.Property indices all meets or exceedes relevant criterion and Practical Project requirement, and simplifies the production process of soft soil curing agent, can extensively promote the use of.
Claims (6)
1. a solidifying agent for low-temperature construction reinforced soft soil ground and processing, is characterized in that being made up of aluminate cement or aluminosulfate cement, desulfurated plaster, silicate cement, unslaked lime, adjustable solidification agent and packing material, and the weight percent of each component is:
Weight percentages
Aluminate cement or aluminosulfate cement 30%～40%;
Desulfurated plaster 20%～30%;
Silicate cement 10%～15%;
Unslaked lime 3%～5%;
Retardant 0.5%～2%;
All the other are packing material, and its gross weight meets 100%.
2. the solidifying agent of low-temperature construction reinforced soft soil ground according to claim 1 and processing, is characterized in that, described aluminate cement is CA-50 or CA-70 level aluminate cement; Aluminosulfate cement is 72.5R level aluminosulfate cement; Silicate cement is P II 52.5R level silicate cement.
3. the solidifying agent of low-temperature construction reinforced soft soil ground according to claim 1 and processing, is characterized in that, retardant is any in glucose, starch, Sodium hexametaphosphate 99, ligninsulfonate or Trisodium Citrate.
4. the solidifying agent of low-temperature construction reinforced soft soil ground according to claim 1 and processing, is characterized in that, the consumption of described soft soil curing agent is 10%～15% of soil mass consolidation weight.
5. the solidifying agent of low-temperature construction reinforced soft soil ground according to claim 1 and processing, it is characterized in that, described soft soil curing agent condenses in 60 minutes at 5 DEG C, and 1 d can bring into play more than 50% mechanical strength, and the curing soil body later stage does not shrink, in the soil body, there is not shrinkage crack.
6. the preparation method of the solidifying agent of a low-temperature construction reinforced soft soil ground as claimed in claim 1 and processing, it is characterized in that concrete steps are: after weighing according to part by weight, first utilizing mixing rate is that the mixing machine of 50～150 r/min mixes aluminate cement or aluminosulfate cement, desulfurated plaster, silicate cement, unslaked lime, adjustable solidification agent, then in above-mentioned mixing machine, said mixture and packing material are mixed together evenly, obtain desired product.
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105130290A (en) * | 2015-07-20 | 2015-12-09 | 上海宝田新型建材有限公司 | Preparation method of foundation reinforcement material |
| CN105152615A (en) * | 2015-08-20 | 2015-12-16 | 刘祥勇 | All solid waste based soft soil foundation consolidation and pressure-relief material as well as application method thereof |
| CN105924109A (en) * | 2016-04-21 | 2016-09-07 | 天津市三川恒泰科技有限公司 | Beach sludge composite curing agent as well as preparation method, use method and application thereof |
| CN108049271A (en) * | 2017-12-09 | 2018-05-18 | 温州振东园林工程有限公司 | A kind of construction of soft soil treatment technique |
| CN108358529A (en) * | 2018-05-04 | 2018-08-03 | 中铁二十三局集团第工程有限公司 | A kind of compound improvement roadbed material of low liquid limit silt and preparation method thereof |
| CN108467249A (en) * | 2018-03-02 | 2018-08-31 | 同济大学 | A kind of soil-solidified-agent and its application method using ardealite and Desulphurization preparation |
| CN108503318A (en) * | 2018-03-28 | 2018-09-07 | 河海大学 | A kind of morning strong agent and its application for dregs backfill |
| CN108558252A (en) * | 2017-12-27 | 2018-09-21 | 东南大学 | A kind of curing agent and its application for reinforcing high organic weak soil |
| CN109485368A (en) * | 2018-11-21 | 2019-03-19 | 中国矿业大学 | A kind of high-moisture percentage soft soil curing agent and its application |
| CN110240458A (en) * | 2019-07-04 | 2019-09-17 | 安徽固维特材料科技有限公司 | A kind of tailing solidifying agent for low temperature environment and preparation method thereof, application method |
| CN110386805A (en) * | 2019-08-22 | 2019-10-29 | 大连海事大学 | A kind of new sulfur aluminate-base mud/soft soil curing agent and its application method |
| CN110615654A (en) * | 2019-04-11 | 2019-12-27 | 苏州重于山新材料科技有限公司 | Curing material for reinforcing soft soil foundation in low-temperature construction and application method thereof |
| CN112341073A (en) * | 2020-11-12 | 2021-02-09 | 中冶成都勘察研究总院有限公司 | Cement slurry for weakening expansibility of expansive soil |
| CN112521113A (en) * | 2020-12-04 | 2021-03-19 | 交通运输部公路科学研究所 | Low-temperature hydration hardening gel material and preparation method and application thereof |
| CN112552010A (en) * | 2020-12-31 | 2021-03-26 | 上海三瑞高分子材料股份有限公司 | Curing material for foundation treatment |
| CN113135730A (en) * | 2021-05-17 | 2021-07-20 | 浙江久豪建筑勘测设计有限公司 | Curing agent and curing process applied to soft soil foundation |
| CN114276108A (en) * | 2021-12-28 | 2022-04-05 | 河北嘉固新材料科技有限公司 | Self-compacting, large-flow-state and ultra-early-strength solidified waste soil-stone slurry and preparation method thereof |
| CN114394812A (en) * | 2022-01-20 | 2022-04-26 | 浙江鼎晟新材料科技有限公司 | Inorganic composite curing agent for consolidating soil |
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| CN103275730A (en) * | 2013-06-13 | 2013-09-04 | 成都理工大学 | Barium-containing sulphoaluminate soft soil curing agent and preparation method thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103275730A (en) * | 2013-06-13 | 2013-09-04 | 成都理工大学 | Barium-containing sulphoaluminate soft soil curing agent and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105130290A (en) * | 2015-07-20 | 2015-12-09 | 上海宝田新型建材有限公司 | Preparation method of foundation reinforcement material |
| CN105152615A (en) * | 2015-08-20 | 2015-12-16 | 刘祥勇 | All solid waste based soft soil foundation consolidation and pressure-relief material as well as application method thereof |
| CN105924109A (en) * | 2016-04-21 | 2016-09-07 | 天津市三川恒泰科技有限公司 | Beach sludge composite curing agent as well as preparation method, use method and application thereof |
| CN108049271A (en) * | 2017-12-09 | 2018-05-18 | 温州振东园林工程有限公司 | A kind of construction of soft soil treatment technique |
| CN108558252A (en) * | 2017-12-27 | 2018-09-21 | 东南大学 | A kind of curing agent and its application for reinforcing high organic weak soil |
| CN108467249A (en) * | 2018-03-02 | 2018-08-31 | 同济大学 | A kind of soil-solidified-agent and its application method using ardealite and Desulphurization preparation |
| CN108503318A (en) * | 2018-03-28 | 2018-09-07 | 河海大学 | A kind of morning strong agent and its application for dregs backfill |
| CN108358529A (en) * | 2018-05-04 | 2018-08-03 | 中铁二十三局集团第工程有限公司 | A kind of compound improvement roadbed material of low liquid limit silt and preparation method thereof |
| CN109485368A (en) * | 2018-11-21 | 2019-03-19 | 中国矿业大学 | A kind of high-moisture percentage soft soil curing agent and its application |
| CN109485368B (en) * | 2018-11-21 | 2020-06-30 | 中国矿业大学 | Soft soil curing agent with high water content and application thereof |
| CN110615654A (en) * | 2019-04-11 | 2019-12-27 | 苏州重于山新材料科技有限公司 | Curing material for reinforcing soft soil foundation in low-temperature construction and application method thereof |
| CN110240458B (en) * | 2019-07-04 | 2021-07-16 | 安徽固维特材料科技有限公司 | Tailing curing agent for low-temperature environment and preparation method and use method thereof |
| CN110240458A (en) * | 2019-07-04 | 2019-09-17 | 安徽固维特材料科技有限公司 | A kind of tailing solidifying agent for low temperature environment and preparation method thereof, application method |
| CN110386805A (en) * | 2019-08-22 | 2019-10-29 | 大连海事大学 | A kind of new sulfur aluminate-base mud/soft soil curing agent and its application method |
| CN110386805B (en) * | 2019-08-22 | 2022-04-01 | 大连海事大学 | Novel sulphoaluminate-based sludge/soft soil curing agent and use method thereof |
| CN112341073A (en) * | 2020-11-12 | 2021-02-09 | 中冶成都勘察研究总院有限公司 | Cement slurry for weakening expansibility of expansive soil |
| CN112521113A (en) * | 2020-12-04 | 2021-03-19 | 交通运输部公路科学研究所 | Low-temperature hydration hardening gel material and preparation method and application thereof |
| CN112552010A (en) * | 2020-12-31 | 2021-03-26 | 上海三瑞高分子材料股份有限公司 | Curing material for foundation treatment |
| CN113135730A (en) * | 2021-05-17 | 2021-07-20 | 浙江久豪建筑勘测设计有限公司 | Curing agent and curing process applied to soft soil foundation |
| CN114276108A (en) * | 2021-12-28 | 2022-04-05 | 河北嘉固新材料科技有限公司 | Self-compacting, large-flow-state and ultra-early-strength solidified waste soil-stone slurry and preparation method thereof |
| CN114394812A (en) * | 2022-01-20 | 2022-04-26 | 浙江鼎晟新材料科技有限公司 | Inorganic composite curing agent for consolidating soil |
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Application publication date: 20140813 |