CN103275730A - Barium-containing sulphoaluminate soft soil curing agent and preparation method thereof - Google Patents
Barium-containing sulphoaluminate soft soil curing agent and preparation method thereof Download PDFInfo
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- CN103275730A CN103275730A CN 201310233051 CN201310233051A CN103275730A CN 103275730 A CN103275730 A CN 103275730A CN 201310233051 CN201310233051 CN 201310233051 CN 201310233051 A CN201310233051 A CN 201310233051A CN 103275730 A CN103275730 A CN 103275730A
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- aluminate
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Abstract
The invention relates to the field of a soft soil curing agent, and particularly provides a barium-containing sulphoaluminate soft soil curing agent and a preparation method thereof. The sulphoaluminate soft soil curing agent comprises components in percentage by weight as follows: (1), 50%-80% of sulfoaluminateclinker containing barium; (2), 25%-40% of calcined gypsum; (3), 10%-12% of lime; (4), 0.5%-2% of a water-retaining agent; and (5), 0.5%-5% of a retarder. The preparation technique process comprises the steps of calcinating natural gypsum, preparing ingredients, mixing and grinding. The soft soil curing agent has the characteristics of quick condensation, high strength and no shrinkage of curing soil volume, total strength can be formed after the curing for 1-3 days, and the soft soil curing agent is particularly suitable for quick maintenance and reinforcement of road foundations; and besides, under the same additive amount, the unconfined compressive strength of compacted soil adopting the soft soil curing agent is apparently higher than that of compacted soil adopting P.C 32.5 ordinary Portland cement, and the reinforcement effect is remarkable.
Description
Technical field
The present invention relates to the soft soil curing agent field, be specifically related to a kind of titanate-containing sulpho-aluminate soft soil curing agent and preparation method thereof.
Background technology
Weak soil refers to the class soil that bearing capacity is low, void ratio is big, water content is high, draught is high.Soft clay ground is carried out consolidation process become one of hot subject of engineering construction and maintenance.The reinforcement of soft soil treatment process has multiple, and as ground compacting, thermal treatment reinforcing and chemical consolidation etc., wherein, the solidifying agent reinforcing soft soil is lower because of its cost, construction is simple relatively, has become the more reinforcement of soft soil of present application and has handled means.
Soft soil curing agent refers at normal temperatures can direct glued soil body particle, or can react with clay mineral, generates gum material, thereby improves the material of soil body physicals.Soft soil curing agent can be divided into calcium base solidifying agent (cement, lime, flyash, slag etc.) and non-calcium base solidifying agent (ionic solidifying agent, enzyme solidifying agent, polymer curing agents etc.) by its main component.The more soft soil curing agent of present domestic application mainly contains cement, lime, flyash etc.
Lime, two ashes (flyash and lime) solidifying agent cost are lower, are widely used in reinforcing swelling soil, but find to exist many shortcomings in application.For example solidification effect is slow, needs 7 to 28 days can form certain intensity after the general construction; Solidified earth intensity is uncontrollable; Water stability is poor, both lost strength after general limestone soil or two-ash soil are immersed in water.
Soil-cement gain in strength speed is fast, and cost is higher relatively, is widely used in various particle diameter weak soil solidification treatment, but when handling cohesive soil, easy and mixing with soil inequality can't obtain ideal effect.Cement slurry is strong basicity, and the pH value is unfavorable for environment protection generally greater than 12, and volumetric shrinkage after the ordinary Portland cement aquation, easily forms the crack in solidified earth.
The molecular formula of titanate-containing sulpho-aluminate mineral is (3-x) CaOxBaO3Al
2O
3CaSO
4, x=0.25 ~ 3 wherein, it is to be made under 1200 ~ 1300 ℃ of temperature by aluminum raw material (as bauxite), calcareous raw material (as Wingdale), gypsum, barite.Its hydration rate is very fast, has early strong, high-strength characteristics, can form whole intensity in general 3 days, and its 3 days intensity are equivalent to 28 days intensity with the label silicate cement.Can consume a large amount of free water during aquation, generate ettringite and aluminum hydroxide gel, water stability and the anti-freezing property of hydrate are better.Aquation slurry pH value is beneficial to the protection environment less than 12, and titanate-containing sulpho-aluminate mineral preparation temperature is lower 100 ~ 200 ℃ than ordinary Portland cement, also is conducive to cut down the consumption of energy.
The domestic exploitation is the quick hardening sulphoaluminate cement of main component, high-strength aluminosulfate cement, expansion aluminosulfate cement, self-stress aluminum sulfate cement, five kinds of low-alkalinity sulphoaluminate cement with the sulphoaluminate phase, technical maturity, only proportion of raw materials need be changed a little, just the titanate-containing sulpho-aluminate grog can be made.
At present, about titanate-containing sulpho-aluminate disclosed patent have: titanate-containing sulpho-aluminate cement (publication number: CN1035486A); A kind of cement based impervious blocking material (publication number: CN1526785A).By retrieval, find no patent application or the bibliographical information that titanate-containing sulpho-aluminate is made soft soil curing agent in the pass.
Summary of the invention
The present invention is directed to the deficiency of existing soft soil curing agent, a kind of prescription and preparation method of novel titanate-containing sulpho-aluminate soft soil curing agent is provided.
The invention provides a kind of soft soil curing agent, its component and each composition weight percentage composition are:
(1) the titanate-containing sulpho-aluminate grog 50 ~ 80%
(2) calcined gypsum 25 ~ 40%
(3) lime 10 ~ 12%
(4) water-holding agent 0.5 ~ 2%
(5) retardant 0.5 ~ 5%
The mineral composition weight percent of the titanate-containing sulpho-aluminate grog that this soft soil curing agent is used is:
(1) titanate-containing sulpho-aluminate [(3-x) CaOxBaO3Al
2O
3CaSO
4, x=0.25 ~ 3 wherein] and 55 ~ 75wt%
(2) Dicalcium Phosphate (Feed Grade) (2CaOSiO
2) 8 ~ 37%
(3) iron phase (2CaOFe
2O
3-6CaO2Al
2O
3Fe
2O
3) 3 ~ 10%
The calcined gypsum that this soft soil curing agent adopts was made at 300 ℃ of temperature lower calcinations by the plaster of paris in 30 minutes.
The water-holding agent that this soft soil curing agent adopts is any in polyacrylamide, sodium polyacrylate, polyacrylic acid potassium, ammonium polyacrylate or the starch grafted acrylate; Retardant is any in starch, sucrose, glucose, toramil B, Xylo-Mucine, carboxyethyl cellulose, Sodium hexametaphosphate 99 or the Trisodium Citrate.
Soft soil curing agent of the present invention is to be main raw material with the titanate-containing sulpho-aluminate grog, adds calcined gypsum, lime, water-holding agent, the common grinding of retardant and makes, and control solidifying agent powder specific grain surface is long-pending to be 300 ~ 400m
2/ kg.
Titanate-containing sulpho-aluminate is by aluminum raw material (as bauxite), calcareous raw material (as Wingdale), gypsum, barite raw material, after suitably cooperating, and the gelling material of making at 1200 ~ 1300 ℃ of temperature lower calcinations.In being full of the liquid phase of gypsum, hydration reaction can take place in titanate-containing sulpho-aluminate, generates ettringite and aluminum hydroxide gel, and reactional equation is as follows:
(3-x) CaOxBaO3Al
2O
3CaSO
4+ 2CaSO
4+ 38H
2The CaOxBaOAl of O → (3-x)
2O
33CaSO
432H
2O+2 (Al
2O
33H
2O) (gel), x=0.25 ~ 3 wherein
Under alkaline condition, aluminum hydroxide gel can with gypsum and calcium hydroxide reaction, further generate ettringite, reactional equation is as follows:
Al
2O
3·3H
2O+3CaSO
4+3Ca(OH)
2+26H
2O→3CaO·Al
2O
3·3CaSO
4·32H
2O
Soft soil curing agent of the present invention, utilized the hydration reaction of titanate-containing sulpho-aluminate mineral, its curing mechanism is as follows: soft soil curing agent is joined in the full water weak soil, titanate-containing sulpho-aluminate immediately with soil in free water reaction, in the liquid phase that is full of gypsum and calcium hydroxide, generate a large amount of ettringite, net reaction is as follows:
(3-x) CaOxBaO3Al
2O
3CaSO
4+ 8CaSO
4+ 6Ca (OH)
2+ 90H
2The CaOyBaOAl of O → 3[(3-y)
2O
33CaSO
432H
2O], x=0.25 ~ 3 wherein, y=0.08 ~ 1
By above-mentioned hydration reaction, the liquid free water in the weak soil is converted into solid state crystallization water, the free water and the part that reduce in the weak soil are weak in conjunction with water-content, and the acicular calcium aluminite mineral of generation energy binder soil soil particle forms new skeleton structure and supports the whole soil body.As calculated, the curable about 3.0 kg water of per 1 kg titanate-containing sulpho-aluminate mineral generate about 6.4 kg ettringite simultaneously.Generate calcium hydroxide behind the lime hydration in the solidifying agent simultaneously, make weak soil be alkalescence, can impel activated silica, aluminium component in the weak soil that the hard reaction of coagulating takes place, directly generate moisture Calucium Silicate powder or calcium aluminate mineral, further cement particle.Ca
2+Can also with Na in the soil
+, K
+Ion generation ion-exchange reduces native micelle absorption positively charged ion amount, and then the attenuate thickness of diffusion layer, impels grogs to gather mutually, forms big mass of soil.
Soft soil curing agent curing speed of the present invention is fast, solidified earth intensity height, can form whole intensity in general 1 ~ 3 day, is particularly suitable for maintenance and reinforcement road basis fast.The solidifying agent hydrated product is mainly ettringite, and volume slightly expands after the aquation, can avoid volumetric shrinkage after the ordinary Portland cement aquation and produce the shortcoming in crack in solidified earth.
Four, embodiment
Specifically describe below by the present invention of embodiment, and be the characteristic of comparative illustration soft soil curing agent of the present invention with cement.Be necessary to be pointed out that at this present embodiment only is used for the present invention is further specified that can not be interpreted as limiting the scope of the invention, the person skilled in the art of this area can make some nonessential improvement and adjustment according to the content of foregoing invention.
1 embodiment 1 ~ 3 and Comparative Examples 1
54.6wt% titanate-containing sulpho-aluminate grog and 34.4wt% calcined gypsum, 10% lime, 0.5wt% polyacrylamide water-holding agent, the common grinding of 0.5wt% Trisodium Citrate retardant are made solidifying agent.Weak soil to be reinforced is taken from the yellow particulate heavy clay in Chengdu, and soil is in advance through 110 ℃ of dryings 24 hours, and is crushed to all by the 3mm round hole sieve with rubber mallet.In dried soil, add 18.18wt%, 22.22wt%, 28.57wt% solidifying agent and 28.57wt%P.C32.5 ordinary Portland cement respectively, stir the back by water ratio 60% adding distilled water, stir and pour slurry into 40 * 40 * 160mm cement mortar tryout and vibratory compaction after 2 minutes.Solidified earth seals with mould, and 20 ℃ of following maintenances 1 day and 3 days, records unconfined compression strength of solidified soil after the demoulding.Material and the intensity of present embodiment and Comparative Examples see Table 1.
The unconfined compression strength of the yellow clay of table 1 solidifying agent and cement stabilization
| Sequence number | Solidifying agent (cement) volume | 1 day unconfined compression strength/KPa | 3 days unconfined compression strength/KPa |
| Embodiment 1 | 18.18wt% | 446.83 | 458.46 |
| Embodiment 2 | 22.22wt% | 1170.64 | 1124.65 |
| Embodiment 3 | 28.57wt% | 2263.77 | 2278.59 |
| Comparative Examples 1 | 28.57wt% | 716.91 | 1697.42 |
2 embodiment 4 ~ 6 and Comparative Examples 2
54.6wt% titanate-containing sulpho-aluminate grog and 34.4wt% calcined gypsum, 10% lime, 0.5wt% polyacrylamide water-holding agent, the common grinding of 0.5wt% Trisodium Citrate retardant are made solidifying agent.Weak soil to be reinforced is taken from the red silty clay of reticulate pattern in Chengdu, and soil is in advance through 110 ℃ of dryings 24 hours, and is crushed to all by the 3mm round hole sieve with rubber mallet.In dried soil, add 18.18wt%, 22.22wt%, 28.57wt% solidifying agent and 28.57wt%P.C32.5 ordinary Portland cement respectively, stir the back by water ratio 60% adding distilled water, stir and pour slurry into 40 * 40 * 160mm cement mortar tryout and vibratory compaction after 2 minutes.Solidified earth seals with mould, and 20 ℃ of following maintenances 1 day and 3 days, records unconfined compression strength of solidified soil after the demoulding.Material and the intensity of present embodiment and Comparative Examples see Table 2.
The unconfined compression strength of the red silty clay of table 2 solidifying agent and cement stabilization
| Sequence number | Solidifying agent (cement) volume | 1 day unconfined compression strength/KPa | 3 days unconfined compression strength/KPa |
| Embodiment 4 | 18.18wt% | 241.41 | 233.93 |
| Embodiment 5 | 22.22wt% | 586.13 | 665.42 |
| Embodiment 6 | 28.57wt% | 1933.36 | 2034.76 |
| Comparative Examples 2 | 28.57wt% | 382.43 | 791.91 |
3 embodiment 7 ~ 9 and Comparative Examples 3
54.6wt% titanate-containing sulpho-aluminate grog and 34.4wt% calcined gypsum, 10% lime, 0.5wt% polyacrylamide water-holding agent, the common grinding of 0.5wt% Trisodium Citrate retardant are made solidifying agent.Weak soil to be reinforced is taken from the full water organophilic clay of particulate in Chengdu, and soil is in advance through 110 ℃ of dryings 24 hours, and is crushed to all by the 3mm round hole sieve with rubber mallet.In dried soil, add 18.18wt%, 22.22wt%, 28.57wt% solidifying agent and 28.57wt%P.C32.5 ordinary Portland cement respectively, stir the back by water ratio 60% adding distilled water, stir and pour slurry into 40 * 40 * 160mm cement mortar tryout and vibratory compaction after 2 minutes.Solidified earth seals with mould, and 20 ℃ of following maintenances 1 day and 3 days, records unconfined compression strength of solidified soil after the demoulding.Material and the intensity of present embodiment and Comparative Examples see Table 3.
The unconfined compression strength of table 3 solidifying agent and cement stabilization particulate organophilic clay
| Sequence number | Solidifying agent (cement) volume | 1 day unconfined compression strength/KPa | 3 days unconfined compression strength/KPa |
| Embodiment 7 | 18.18wt% | 666.43 | 647.09 |
| Embodiment 8 | 22.22wt% | 1122.79 | 1073.58 |
| Embodiment 9 | 28.57wt% | 2574.21 | 2715.09 |
| Comparative Examples 3 | 28.57wt% | 519.84 | 858.90 |
Claims (8)
1. titanate-containing sulpho-aluminate soft soil curing agent, its component comprises titanate-containing sulpho-aluminate grog, calcined gypsum, lime, water-holding agent and retardant, the weight percentage of each component is:
(1) the titanate-containing sulpho-aluminate grog 50 ~ 80%;
(2) calcined gypsum 25 ~ 40%;
(3) lime 10 ~ 12%;
(4) water-holding agent 0.5 ~ 2%;
(5) retardant 0.5 ~ 5%.
2. a kind of titanate-containing sulpho-aluminate soft soil curing agent according to claim 1 is characterized in that it is 300 ~ 400 m that described titanate-containing sulpho-aluminate solidifying agent specific grain surface amasss
2/ kg.
3. a kind of titanate-containing sulpho-aluminate soft soil curing agent according to claim 1 is characterized in that the predominant quantity per-cent of used titanate-containing sulpho-aluminate grog is:
(1) titanate-containing sulpho-aluminate [(3-x) CaOxBaO3Al
2O
3CaSO
4, x=0.25 ~ 3 wherein] and 55 ~ 75%;
(2) Dicalcium Phosphate (Feed Grade) (2CaOSiO
2) 8 ~ 37%;
(3) iron phase (2CaOFe
2O
3-6CaO2Al
2O
3Fe
2O
3) 3 ~ 10%.
4. a kind of titanate-containing sulpho-aluminate soft soil curing agent according to claim 1 is characterized in that water-holding agent is any in polyacrylamide, sodium polyacrylate, polyacrylic acid potassium, ammonium polyacrylate or the starch grafted acrylate.
5. a kind of titanate-containing sulpho-aluminate soft soil curing agent according to claim 1 is characterized in that retardant is any in starch, sucrose, glucose, toramil B, Xylo-Mucine, carboxyethyl cellulose, Sodium hexametaphosphate 99 or the Trisodium Citrate.
6. according to the preparation method of the described a kind of titanate-containing sulpho-aluminate soft soil curing agent of claim 1, it is characterized in that technical process may further comprise the steps:
(1) preparation of calcined gypsum: the plaster of paris ground with shredder make diameter 75 ~ 96 μ m particles, make diameter 2 ~ 20mm spherolite at nodulizer after adding water, 250 ~ 350 ℃ of calcinings of temperature 30 minutes;
(2) the titanate-containing sulpho-aluminate grog of being made by the ordinary method calcining adds calcined gypsum, lime, water-holding agent and retardant, is ground to compound particles specific surface area 300 ~ 400 m with shredder at normal temperatures
2/ kg namely makes the titanate-containing sulpho-aluminate soft soil curing agent.
7. a kind of titanate-containing sulpho-aluminate soft soil curing agent according to claim 1 is characterized in that solidifying that solidified earth forms whole intensity in the back 1 ~ 3 day.
8. a kind of titanate-containing sulpho-aluminate soft soil curing agent according to claim 1 is characterized in that solidifying that the after fixing soil body is long-pending does not shrink, and does not have shrinkage crack in the soil body.
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| CN103664891A (en) * | 2013-12-24 | 2014-03-26 | 辽宁工程技术大学 | Soft soil foundation curing agent |
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| CN110128081B (en) * | 2019-06-15 | 2021-06-15 | 广东腾基建设有限公司 | Concrete and preparation method thereof |
| CN112430464A (en) * | 2020-11-05 | 2021-03-02 | 山东省交通科学研究院 | Wide-temperature-range soil composite curing agent and soil curing method |
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