CN112723835A - Cement modifier containing saline soil and preparation method thereof - Google Patents
Cement modifier containing saline soil and preparation method thereof Download PDFInfo
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- CN112723835A CN112723835A CN202110124027.1A CN202110124027A CN112723835A CN 112723835 A CN112723835 A CN 112723835A CN 202110124027 A CN202110124027 A CN 202110124027A CN 112723835 A CN112723835 A CN 112723835A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to the field of cement modification, and particularly discloses a cement modifier containing saline soil and a preparation method thereof. The cement modifier containing the saline soil comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: salinized soil: 25-65 parts; vinyl bis stearamide: 0-5 parts; portland cement: 25-65 parts; water reducing agent: 0-5 parts; 0-5 parts of an organic solvent; the component B comprises 5-8 parts of calcium monoaluminate; the preparation method comprises the following steps: dissolving vinyl bis stearamide; dispersing saline soil; curing the saline soil; finally, mixing; the cement modifier containing the saline soil has the advantages that the resistance of cement to expansion with heat and contraction with cold is enhanced by using the soluble salt in the saline soil; in addition, the preparation method has the advantage of preparing the cement with resistance to thermal expansion and cold contraction through simple and convenient steps.
Description
Technical Field
The invention relates to the field of cement modification, in particular to a cement modifier containing saline soil.
Background
The salinized soil is a general term of salinized soil, alkaline earth and various salinized and alkalized soils, is mainly distributed in northwest regions of China, inner Mongolia river sleeve regions and southeast coastal regions, but is mostly concentrated in inland basins in the northwest. In 1m of the surface layer, soil with the average content of the easily soluble salt being more than 0.3 percent is called saline soil; common lyotropic salts include chloride, sulfate, and carbonate salts, and the like;
the saline soil has the characteristics of high natural water content, large natural pore ratio, high compressibility, low shear strength, small consolidation coefficient, long consolidation time, high sensitivity, high disturbance, poor water permeability and the like, and diseases such as salt expansion, slurry turning, frost heaving, leaching, wet sinking and the like generated by a saline soil roadbed seriously affect the stability and durability of roads, so that the saline soil is very necessary to treat.
The improved saline soil is used as a raw material of building products, is a great direction for utilizing the saline soil, can solve the problem of lack of building material resources, and can realize resource utilization of the saline soil. However, the saline soil has the defects of low breaking and compression strength, poor water resistance, poor volume stability and the like, and the application of the saline soil in building materials is limited.
At present, Chinese patent with publication No. CN106477997B discloses a method for curing saline soil by using emulsified asphalt, which comprises a method and steps of preparing emulsified asphalt by dodecyl trimethyl ammonium bromide and then curing the saline soil by using the emulsified asphalt.
Although the method for solidifying the saline soil by adopting the emulsified asphalt applies the saline soil to the building materials, the saline soil is only simply mixed, any targeted treatment is not carried out on the soluble salt in the saline soil, and the specific resource utilization of the soluble salt is not utilized.
Disclosure of Invention
The invention aims to provide a cement modifier containing saline soil, which has the advantage of enhancing the resistance of cement to expansion caused by heat and contraction caused by cold by using easily soluble salt in the saline soil.
The technical purpose of the invention is realized by the following technical scheme:
a cement modifier containing saline soil,
the cement modifier containing the saline soil comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight:
salinized soil: 25-65 parts;
vinyl bis stearamide: 0-5 parts;
portland cement: 25-65 parts;
water reducing agent: 0-5 parts;
0-5 parts of an organic solvent;
the component B comprises 5-8 parts of calcium monoaluminate.
By adopting the technical scheme, the dispersing performance of the saline soil is enhanced by mixing the saline soil and the vinyl bis-stearamide, so that the soluble salt in the saline soil is uniformly dispersed in the solution, the characteristics of the saline soil can be kept in the subsequent curing treatment, and the resistance of cement to expansion with heat and contraction with cold is enhanced; in the curing process, the crosslinking property of the modified cement agent is enhanced through hexamethylcyclotrisiloxane, so that the toughness of the cement modifier is enhanced.
Further setting: the saline soil is loess-shaped sulfuric acid saline soil containing one or more of chloride, sulfate and carbonate inside.
Through adopting above-mentioned technical scheme, the loess form sulfate saline soil that inside contained multiple easy soluble salt has been selected for use to the saline soil for the abnormal expansion that easy soluble salt has promptly the characteristic of shrinkage expend with heat and contract with cold that the characteristic that the cold and expand with heat can offset with cement itself has, avoids cement because of the volume change that inflation or shrink arouse to the harm that oneself caused.
Further setting: the water reducing agent comprises hexamethylcyclotrisiloxane and vinyl crude rubber in a weight component ratio of 1: 1.
By adopting the technical scheme, the vinyl raw rubber and the hexamethylcyclotrisiloxane are mixed and can form the water reducing agent under the action of the vinyl bis stearamide, and the water reducing agent can enhance the crosslinking property and the toughness of the cement modifier, so that the performance of the cement modifier is enhanced.
Further setting: the silicate cement comprises tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite.
By adopting the technical scheme, the silicon-hydrochloric acid cement also contains silicate with abnormal expansion characteristic, and the performance of the saline soil can be enhanced.
Further setting: the organic solvent is one or a combination of more of dimethylbenzene, trichloroethylene and tetrachloroethylene.
By adopting the technical scheme, the vinyl bis stearamide can be dissolved in the heated organic solvent to enhance the dispersibility of the vinyl bis stearamide, so that the subsequent mixing and intermiscibility effect with the saline soil is enhanced.
It is another object of the present invention to provide a method for preparing a cement modifier containing saline soil, which has the advantage of obtaining cement resistant to thermal expansion and cold contraction through simple and convenient steps.
The technical purpose of the invention is realized by the following technical scheme:
a preparation method of a cement modifier containing saline soil comprises the following preparation steps:
s1: pre-treating saline soil: carrying out salt washing treatment on the saline soil at normal temperature, and uniformly crushing the saline soil after the saline soil is naturally dried to obtain saline soil powder;
s2: dissolution of vinyl bis stearamide: heating the temperature of the organic solvent, adding vinyl bis stearamide, and stirring until the mixture is uniformly dispersed to obtain a vinyl bis stearamide solution;
s3: dispersing saline soil: mixing the vinyl bis-stearamide solution with the saline soil, uniformly stirring, and cooling to normal temperature to obtain a saline soil dispersion solution;
s4: curing the saline soil: mixing hexamethylcyclotrisiloxane and vinyl raw rubber according to the weight part ratio of 1:1, uniformly stirring, mixing with the saline soil dispersion solution and Portland cement, heating and stirring to obtain cured saline soil;
s5: and (3) final mixing: and mixing the solidified saline soil with calcium monoaluminate to obtain the cement modifier containing the saline soil.
By adopting the technical scheme, the vinyl bis stearamide is dissolved in the organic solvent and then is firstly used as a dispersing agent in the dispersion liquid of the saline soil to enhance the dispersibility of the saline soil, and plays a dispersing role on hexamethylcyclotrisiloxane and vinyl crude rubber in the subsequent curing process to promote the performance of the shrinking agent, and then is mixed with the saline soil and Portland cement to complete the curing, so that the cement modifier containing the saline soil with better toughness and local thermal expansion and cold contraction effects is obtained, and the cement modifier is mixed with calcium monoaluminate while modifying the ordinary cement to further enhance the strength of the cement.
Further setting: the salt washing in the step S1 is to wash the saline soil with brine to remove the impurity particles attached to the surface of the saline soil.
By adopting the technical scheme, the salt washing can wash impurities in the salt while keeping the easily soluble salt in the salt.
Further setting: in step S2, the heating temperature for dissolving the vinyl bis-stearamide is 40-80 ℃.
By adopting the technical scheme, the vinyl bis stearamide is difficult to dissolve in common organic solvents, has good solubility in heated organic solvents, and is beneficial to the subsequent steps.
Further setting: in step S3, the heating temperature is less than 50 ℃.
Through adopting above-mentioned technical scheme, the heating can help the mixed effect of salinized soil dispersion, and can further promote the solubility of vinyl bis stearamide, avoids dissolving incompletely, but the performance of other components wherein can be influenced to the high temperature.
Further setting: in step S4, the calcium monoaluminate is calcined before being mixed with the solidified saline soil.
By adopting the technical scheme, the performance and the strength of the calcium monoaluminate can be enhanced by calcining the calcium monoaluminate, so that the toughness and the strength of the final modified cement are enhanced.
In conclusion, the invention has the following beneficial effects: the dispersing performance of the saline soil is enhanced by mixing the saline soil and the vinyl bis-stearamide, so that the soluble salt in the saline soil is uniformly dispersed in the solution, the characteristics of the saline soil can be kept in the subsequent curing treatment, and the resistance of cement to expansion with heat and contraction with cold is enhanced; in the curing process, the crosslinking property of the modified cement agent is enhanced through hexamethylcyclotrisiloxane, so that the toughness of the cement modifier is enhanced.
Meanwhile, the vinyl bis stearamide solution is used as a dispersing agent to enhance the dispersibility of the saline soil, and also plays a role in dispersing hexamethylcyclotrisiloxane and vinyl crude rubber to promote the performance of a shrinking agent in the subsequent curing process, so that the cement modifier containing the saline soil with better toughness and local thermal expansion and cold contraction effects is obtained, and the cement modifier is mixed with calcium monoaluminate while modifying ordinary cement to further enhance the strength of the cement.
Detailed Description
The present invention will be described in further detail below.
Examples 1-22, a cement modifier comprising saline soil, the components and their respective masses of which are shown in table 1, was prepared by the following steps:
s1: pre-treating saline soil: carrying out salt washing treatment on the saline soil at normal temperature, and uniformly crushing the saline soil after the saline soil is naturally dried to obtain saline soil powder;
s2: dissolution of vinyl bis stearamide: heating the temperature of the organic solvent, adding vinyl bis stearamide, and stirring until the mixture is uniformly dispersed to obtain a vinyl bis stearamide solution;
s3: dispersing saline soil: mixing the vinyl bis-stearamide solution with the saline soil, uniformly stirring, and cooling to normal temperature to obtain a saline soil dispersion solution;
s4: curing the saline soil: mixing hexamethylcyclotrisiloxane and vinyl crude rubber according to the weight part ratio of 1:1, adding a vinyl bis stearamide solution, uniformly stirring, mixing with the saline soil dispersion solution and Portland cement, heating and stirring to obtain cured saline soil;
s5: and (3) final mixing: and mixing the solidified saline soil with calcium monoaluminate to obtain the cement modifier containing the saline soil.
The salt washing in step S1 is to wash the saline soil with brine to remove the impurity particles attached to the surface of the saline soil.
In step S2, the heating temperature for dissolving the vinyl bis-stearamide is 40-80 ℃.
In step S3, the heating temperature is less than 50 ℃.
In step S4, the calcium monoaluminate is calcined before being mixed with the solidified saline soil.
TABLE 1 preparation example of cement modifier containing saline soil
In the table, the saline soil is loess-shaped sulfate saline soil containing one or more of chloride, sulfate and carbonate inside.
The silicate cement components comprise tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite performance test tests.
The organic solvent is one or a combination of more of dimethylbenzene, trichloroethylene and tetrachloroethylene.
The water reducing agent comprises hexamethylcyclotrisiloxane and vinyl crude rubber with the weight component of 1: 1.
Performance detection test:
1. coagulation time: the initial setting time is the time from the addition of water to the cement until the loss of plasticity begins. The setting time has a great influence on the construction method and the engineering progress, so the setting time needs to be measured to check whether the setting time meets the requirements of concrete construction. The final set time is the time required from when the cement mixes with water to when the cement paste loses plasticity completely and begins to develop strength.
2. Strength: the strength of cement is an important index for evaluating the quality of cement and is a basis for dividing the strength grade of the cement. The strength of cement is the ability of the cement mortar to withstand external force damage, expressed in MPa. According to the specification of national standard GB175-1999 Portland cement and ordinary Portland cement, the strength of the cement is measured, test pieces are manufactured according to the specification, the test pieces are maintained, and the flexural strength and the compressive strength at the specified age are measured to evaluate the strength grade of the cement. The compression strength and the breaking strength of the portland cement in a specified age are divided into six strength grades of 42.5R, 52.5R, 62.5R and 62.5R.
3. Volume stability: the volume stability of cement refers to the property of cement whether the volume change is uniform or not in the setting and hardening process. If the cement is hardened to generate uneven volume change, the volume is poor in stability, and the poor stability can cause expansion cracks to be generated on cement products or concrete members, so that the quality of buildings is reduced, and even serious accidents are caused; the national standard stipulates that the content of free magnesium oxide in portland cement cannot exceed 5.0%, and the content of sulfur trioxide in cement cannot exceed 3.5%, so as to control the volume stability of cement.
Specific test results are shown in Table 2
TABLE 2 method of modifying cement with cement modifier containing saline soil
According to the detection result, on one hand, the addition of the water reducing agent can improve the setting time of the portland cement, properly prolong the initial setting time and accelerate the final setting time, so that the basic performance of the cement is ensured and the setting of the cement is accelerated; on the other hand, the water reducing agent can also reduce the content of free magnesium oxide in the cement, so that the volume change of the cement is uniform in the setting and hardening process.
In the selection of the organic solvent, different optimal proportions of each solvent can be found, but the optimal effect is basically the same.
With respect to the strength grade, the vinyl bis-stearamide and the portland cement can greatly enhance the strength of the final cement, and the strengthening effects of the vinyl bis-stearamide and the portland cement can be added to form a better effect, and if the vinyl bis-stearamide and the portland cement are not added, the compressive property of the final finished cement is poor.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but only protected by the patent laws within the scope of the claims.
Claims (10)
1. A cement modifier containing saline soil is characterized in that:
the cement modifier containing the saline soil comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight:
salinized soil: 25-65 parts;
vinyl bis stearamide: 0-5 parts;
portland cement: 25-65 parts;
water reducing agent: 0-5 parts;
0-5 parts of an organic solvent;
the component B comprises 5-8 parts of calcium monoaluminate.
2. The cement modifier containing saline soil as set forth in claim 1, wherein: the saline soil is loess-shaped sulfuric acid saline soil containing one or more of chloride, sulfate and carbonate inside.
3. The cement modifier containing saline soil as set forth in claim 1, wherein: the water reducing agent comprises hexamethylcyclotrisiloxane and vinyl raw rubber in a weight ratio of 1: 1.
4. The cement modifier containing saline soil as set forth in claim 1, wherein: the silicate cement comprises tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite.
5. The cement modifier containing saline soil as set forth in claim 1, wherein: the organic solvent is one or a combination of more of dimethylbenzene, trichloroethylene and tetrachloroethylene.
6. A preparation method of a cement modifier containing saline soil is characterized by comprising the following steps: the preparation steps are as follows:
s1: pre-treating saline soil: carrying out salt washing treatment on the saline soil at normal temperature, and uniformly crushing the saline soil after the saline soil is naturally dried to obtain saline soil powder;
s2: dissolution of vinyl bis stearamide: heating an organic solvent, adding vinyl bis stearamide, and stirring until the mixture is uniformly dispersed to obtain a vinyl bis stearamide solution;
s3: dispersing saline soil: mixing the vinyl bis-stearamide solution with the saline soil, uniformly stirring, and cooling to normal temperature to obtain a saline soil dispersion solution;
s4: curing the saline soil: mixing hexamethylcyclotrisiloxane and vinyl raw rubber according to the weight part ratio of 1:1, uniformly stirring, mixing with the saline soil dispersion solution and Portland cement, heating and stirring to obtain cured saline soil;
s5: and (3) final mixing: and mixing the solidified saline soil with calcium monoaluminate to obtain the cement modifier containing the saline soil.
7. The method for preparing a cement modifier containing saline soil as set forth in claim 6, wherein: the salt washing in the step S1 is to wash the saline soil with brine to remove the impurity particles attached to the surface of the saline soil.
8. The method for preparing a cement modifier containing saline soil as set forth in claim 6, wherein: in step S2, the heating temperature for dissolving the vinyl bis-stearamide is 40-80 ℃.
9. The method for preparing a cement modifier containing saline soil as set forth in claim 6, wherein: in step S3, the heating temperature is less than 50 ℃.
10. The method for preparing a cement modifier containing saline soil as set forth in claim 6, wherein: in step S4, the calcium monoaluminate is calcined before being mixed with the solidified saline soil.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114751687A (en) * | 2022-05-31 | 2022-07-15 | 河海大学 | Fiber composite modified desert sand reinforced cement mortar and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8427457D0 (en) * | 1984-10-30 | 1984-12-05 | Coal Industry Patents Ltd | Calcium monoaluminate cement packing |
| CN105238410A (en) * | 2014-07-08 | 2016-01-13 | 上海卓地环保科技有限公司 | Soil composite repairing agent |
| CN106477997A (en) * | 2016-11-03 | 2017-03-08 | 天津城建大学 | A kind of method of employing emulsified asphalt stabilized saline soil |
| CN108002783A (en) * | 2017-12-19 | 2018-05-08 | 中山市雅乐思商住电器有限公司 | Novel material for reinforcing saline soil foundation |
| CN108751863A (en) * | 2018-07-17 | 2018-11-06 | 燕山大学 | A kind of cementitious material and preparation method thereof based on salinized soil |
| CN109467374A (en) * | 2018-12-28 | 2019-03-15 | 海南鑫申绿色建筑科技有限公司 | A kind of earthquake-resistant structure plate and preparation method thereof |
-
2021
- 2021-01-28 CN CN202110124027.1A patent/CN112723835B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8427457D0 (en) * | 1984-10-30 | 1984-12-05 | Coal Industry Patents Ltd | Calcium monoaluminate cement packing |
| CN105238410A (en) * | 2014-07-08 | 2016-01-13 | 上海卓地环保科技有限公司 | Soil composite repairing agent |
| CN106477997A (en) * | 2016-11-03 | 2017-03-08 | 天津城建大学 | A kind of method of employing emulsified asphalt stabilized saline soil |
| CN108002783A (en) * | 2017-12-19 | 2018-05-08 | 中山市雅乐思商住电器有限公司 | Novel material for reinforcing saline soil foundation |
| CN108751863A (en) * | 2018-07-17 | 2018-11-06 | 燕山大学 | A kind of cementitious material and preparation method thereof based on salinized soil |
| CN109467374A (en) * | 2018-12-28 | 2019-03-15 | 海南鑫申绿色建筑科技有限公司 | A kind of earthquake-resistant structure plate and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114751687A (en) * | 2022-05-31 | 2022-07-15 | 河海大学 | Fiber composite modified desert sand reinforced cement mortar and preparation method thereof |
| CN114751687B (en) * | 2022-05-31 | 2022-09-30 | 河海大学 | Fiber composite modified desert sand reinforced cement mortar and preparation method thereof |
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