CN113321439A - Application method of retarder in cement - Google Patents
Application method of retarder in cement Download PDFInfo
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- CN113321439A CN113321439A CN202110727657.8A CN202110727657A CN113321439A CN 113321439 A CN113321439 A CN 113321439A CN 202110727657 A CN202110727657 A CN 202110727657A CN 113321439 A CN113321439 A CN 113321439A
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- Prior art keywords
- retarder
- cement
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- biosurfactant
- application method
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an application method of a retarder in cement, wherein the retarder comprises the following raw materials: 15-30% of sodium lignosulfonate, 3-15% of biosurfactant, 15-40% of inorganic phosphate, 7-20% of organic phosphonate, 3-10% of tartaric acid and 15-25% of deionized water, wherein in the preparation process of the retarder, adding a certain amount of sodium lignin sulfonate and polyoxyethylene type nonionic surfactant into the raw materials, wherein the sodium lignosulfonate can be compounded with inorganic phosphate and organic phosphonic acid for use, the application range of the cement retarder in different temperature environments is enlarged, meanwhile, the fluidity and plasticity of the cement can be greatly improved, the production of harmful pores is greatly reduced, and by utilizing the calcium soap dispersion characteristic of the biosurfactant, the biosurfactant can effectively disperse coagulates generated in the cement retarding process into a plurality of small particles so as to prevent the coagulates from agglomerating to cause the premature hardening of the cement.
Description
Technical Field
The invention relates to the technical field of retarded cement, in particular to an application method of a retarder in cement.
Background
The cement is a powdery hydraulic inorganic cementing material which can be made into a slurry after being stirred by adding water, can be hardened in the air or better in water, can firmly bond sand, stone and other materials together, is similar to the modern lime-pozzolan cement in early stage, and can resist the corrosion of fresh water or salt-containing water after being hardened.
The cement retarder is an additive which can delay cement hydration reaction, thereby prolonging the setting time of concrete, keeping the plasticity of fresh concrete for a long time, facilitating the pouring, improving the construction efficiency and simultaneously not causing adverse effect on various performances of the later stage of the concrete.
The existing common cement retarder is mostly a product prepared by modifying a tannin derivative and a lignite preparation, is sensitive to temperature change, has great limitation when in use, is not long enough for the initial setting time of cement, and further can not be flat on the ground in large area, the cement which is just laid is quickly set and hardened, and the quality of the laid road is seriously influenced.
Disclosure of Invention
The invention aims to provide an application method of a retarder in cement, which solves the problems that the conventional cement retarder has great limitation in use, the initial setting time of the cement is not long enough, and further, when the retarder is operated on a large area of ground, the cement which is just laid is quickly set and hardened when the ground is not leveled, so that the quality of the laid road is seriously influenced.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
the invention provides an application method of a retarder in cement, wherein the retarder comprises the following raw materials: 15-30% of sodium lignosulfonate, 3-15% of a biosurfactant, 15-40% of an inorganic phosphate, 7-20% of an organic phosphonate, 3-10% of tartaric acid and 15-25% of deionized water.
As a preferable scheme of the application method of the retarder in cement, the retarder comprises the following components in percentage by weight: 20% sodium lignosulfonate, 10% biosurfactant, 20% inorganic phosphate, 20% organic phosphonate, 8% tartaric acid and 22% deionized water.
As a preferable scheme of the application method of the retarder in cement, the retarder comprises the following components in percentage by weight: 20% sodium lignosulfonate, 10% biosurfactant, 25% inorganic phosphate, 15% organic phosphonate, 8% tartaric acid and 15% deionized water.
As a preferable scheme of the application method of the retarder in cement, the retarder comprises the following components in percentage by weight: 20% sodium lignosulfonate, 10% biosurfactant, 30% inorganic phosphate, 10% organic phosphonate, 8% tartaric acid and 15% deionized water.
In a preferred embodiment of the present invention, the organic phosphonate is methyl phosphate, and the inorganic phosphate is sodium hexametaphosphate.
As a preferable scheme of the invention, the preparation of the retarder comprises the following steps:
the method comprises the following steps: putting sodium lignosulfonate, inorganic phosphate, organic phosphonate and tartaric acid in corresponding percentage into deionized water in corresponding percentage to obtain primary retarder mixed liquor;
step two: stirring the primary mixed solution at the temperature of 30-35 ℃ for 30-50 min to obtain a homogenized retarder mixed solution;
step three: adding a corresponding percentage of biosurfactant into the homogenized retarder mixed solution, and stirring for 30min in a constant temperature environment to obtain a forming retarder solution;
step four: atomizing the forming retarder solution into the dried matter, wherein the spraying amount is 15-35 cm3/mL, extruding for 1-2 times by using an extruder, drying for 2-3 days, and finally drying at the temperature of 95-120 ℃ to obtain forming retarder powder.
In a preferred embodiment of the present invention, the biosurfactant is a polyoxyethylene type nonionic surfactant.
As a preferable scheme of the invention, the preparation of the cement comprises the following raw materials in percentage by mass: 65-80 parts of cement clinker, 5-20 parts of fluorgypsum, 3-10 parts of modified phosphogypsum, 10-20 parts of fly ash and 4-6 parts of retarder.
As a preferable scheme of the invention, the cement clinker comprises the following components in percentage by mass: 80 parts of silicate cement clinker, 35 parts of carbonaceous shale, 6 parts of iron raw materials and 5 parts of desulfurized gypsum, wherein the iron raw materials are iron ore and iron tailings, and the mass ratio of the iron raw materials to the iron tailings is 1: 3.
As a preferable scheme of the invention, the preparation of the cement comprises the following steps;
the method comprises the following steps: crushing cement clinker by using a roller crusher, selecting a screen with the aperture of 200 mu m to screen out impurities with the diameter of more than 200 mu m, crushing fluorgypsum and modified phosphogypsum by using a jaw crusher, selecting a screen with the aperture of 250 mu m to screen out impurities with the diameter of more than 250 mu m, and selecting a screen with the aperture of 225 mu m to screen out fly ash and a retarder to screen out impurities with the diameter of more than 225 mu m in the fly ash and the retarder;
step two: stirring and mixing cement clinker, fluorgypsum, modified phosphogypsum and fly ash in corresponding mass percentage, wherein the stirring speed is 600-1150 rpm, and the stirring time is 30min, so as to obtain a primary mixed material;
step three: adding the retarder with the corresponding weight part into the preliminary mixed material, mixing and stirring at the stirring speed of 300-850 rpm for 30min to obtain a combined mixed material;
step four: and crushing the combined mixed materials, and pre-homogenizing to obtain the refined cement mixture.
And fifthly, putting the refined cement mixture into a grinding machine with steel balls for grinding, wherein the rotating speed is 13-22 rpm, and the grinding time is 50-80 min.
Compared with the prior art, the invention has the following beneficial effects:
in the process of preparing the retarder, a certain amount of sodium lignosulfonate and polyoxyethylene type nonionic surfactant are added into raw materials, wherein the sodium lignosulfonate can be compounded with inorganic phosphate and organic phosphonic acid for use, the adaptation range of the cement retarder under different temperature environments is enlarged, meanwhile, the fluidity and plasticity of cement can be greatly improved, the production of harmful pores is greatly reduced, the compressive strength of the cement after shaping is enhanced, and the biological surfactant can effectively disperse coagulates generated in the cement retarding process into a plurality of small particles by utilizing the calcium soap dispersion characteristic of the biological surfactant, so that the coagulates are prevented from being agglomerated and causing early hardening of the cement.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the preparation method of the cement comprises the following raw materials in percentage by mass: 80 parts of cement clinker, 5 parts of fluorgypsum, 5 parts of modified phosphogypsum and 10 parts of fly ash, wherein the cement clinker comprises the following components in parts by mass: 80 parts of Portland cement clinker, 35 parts of carbonaceous shale, 6 parts of iron raw material and 5 parts of desulfurized gypsum. The iron raw materials are iron ore and iron tailings, and the mass ratio of the iron raw materials to the iron tailings is 1: 3.
The preparation of the cement comprises the following steps;
the method comprises the following steps: crushing cement clinker by using a roller crusher, selecting a screen with the aperture of 200 mu m to screen out impurities with the diameter of more than 200 mu m, crushing fluorgypsum and modified phosphogypsum by using a jaw crusher, selecting a screen with the aperture of 250 mu m to screen out impurities with the diameter of more than 250 mu m, and selecting a screen with the aperture of 225 mu m to screen out fly ash and a retarder to screen out impurities with the diameter of more than 225 mu m in the fly ash and the retarder;
step two: stirring and mixing cement clinker, fluorgypsum, modified phosphogypsum and fly ash in corresponding mass percentage, wherein the stirring speed is 600-1150 rpm, and the stirring time is 30min, so as to obtain a primary mixed material;
step three: and crushing the combined mixed material, and pre-homogenizing to obtain a formed cement mixture.
And step four, putting the refined cement mixture into a grinding machine with steel balls for grinding, wherein the rotating speed is 13-22 rpm, and the grinding time is 50-80 min.
The second embodiment is as follows:
the preparation method of the cement comprises the following raw materials in percentage by mass: 75 parts of cement clinker, 10 parts of fluorgypsum, 5 parts of modified phosphogypsum and 10 parts of fly ash, wherein the cement clinker comprises the following components in parts by mass: 80 parts of Portland cement clinker, 35 parts of carbonaceous shale, 6 parts of iron raw material and 5 parts of desulfurized gypsum. The iron raw materials are iron ore and iron tailings, and the mass ratio of the iron raw materials to the iron tailings is 1: 3.
In the second embodiment, the cement is prepared by the same method as that in the first embodiment.
The third concrete embodiment:
the preparation method of the cement comprises the following raw materials in percentage by mass: 70 parts of cement clinker, 15 parts of fluorgypsum, 10 parts of modified phosphogypsum and 5 parts of fly ash, wherein the cement clinker comprises the following components in parts by mass: 80 parts of Portland cement clinker, 35 parts of carbonaceous shale, 6 parts of iron raw material and 5 parts of desulfurized gypsum. The iron raw materials are iron ore and iron tailings, and the mass ratio of the iron raw materials to the iron tailings is 1: 3.
In the third example, the cement was prepared in the same manner as in the first example.
The fourth concrete embodiment:
the third embodiment is different from the first embodiment in that after a preliminary admixture is prepared in the preparation process of cement, a retarder in a corresponding weight part is added into the preliminary admixture to be mixed and stirred, the stirring speed is 300-850 rpm, and the stirring time is 30min, so that a combined admixture is obtained, wherein the retarder is 4 parts.
The preparation of the retarder comprises the following raw materials: 20% of sodium lignosulfonate, 10% of a biosurfactant, 20% of inorganic phosphate, 20% of organic phosphonate, 8% of tartaric acid and 22% of deionized water, wherein the organic phosphonate is methyl phosphate, the inorganic phosphate is sodium hexametaphosphate, and the biosurfactant is a polyoxyethylene type nonionic surfactant.
The preparation of the retarder comprises the following steps;
the method comprises the following steps: putting sodium lignosulfonate, inorganic phosphate, organic phosphonate and tartaric acid in corresponding percentage into deionized water in corresponding percentage to obtain primary retarder mixed liquor;
step two: stirring the primary mixed solution at the temperature of 30-35 ℃ for 30-50 min to obtain a homogenized retarder mixed solution;
step three: adding a corresponding percentage of biosurfactant into the homogenized retarder mixed solution, and stirring for 30min in a constant temperature environment to obtain a forming retarder solution;
step four: atomizing the forming retarder solution into the dried matter, wherein the spraying amount is 15-35 cm3/mL, extruding for 1-2 times by using an extruder, drying for 24-36 h, and finally drying at the temperature of 95-120 ℃ to obtain forming retarder powder.
The fifth concrete embodiment:
the third embodiment is different from the fourth embodiment in that the retarder is prepared from the following raw materials: 20% of sodium lignosulfonate, 10% of a biosurfactant, 25% of inorganic phosphate, 15% of organic phosphonate, 8% of tartaric acid and 15% of deionized water, wherein the organic phosphonate is methyl phosphate, the inorganic phosphate is sodium hexametaphosphate, and the biosurfactant is a polyoxyethylene type nonionic surfactant.
The retarder in example five was prepared as in example four.
The sixth specific embodiment:
the sixth embodiment is different from the fourth embodiment in that the retarder comprises the following components in percentage by weight: 20% of sodium lignosulfonate, 10% of a biosurfactant, 30% of inorganic phosphate, 10% of organic phosphonate, 8% of tartaric acid and 15% of deionized water, wherein the organic phosphonate is methyl phosphate, the inorganic phosphate is sodium hexametaphosphate, and the biosurfactant is a polyoxyethylene type nonionic surfactant.
The retarder in example five was prepared as in example four.
The seventh specific embodiment:
the seventh embodiment is different from the fourth embodiment in that the mass component of the retarder is 5 parts.
The retarder in example five was prepared as in example four.
The eighth embodiment:
the eighth embodiment is different from the fourth embodiment in that the mass component of the retarder is 6 parts.
The retarder in example five was prepared as in example four.
The specific embodiment is nine:
the ninth embodiment is different from the fifth embodiment in that the mass component of the retarder is 5 parts.
The retarder in example five was prepared as in example four.
The specific embodiment ten:
the tenth embodiment is different from the fifth embodiment in that the mass component of the retarder is 6 parts.
The retarder in example five was prepared as in example four.
The first specific embodiment:
the eleventh embodiment is different from the sixth embodiment in that the mass component of the retarder is 5 parts.
The retarder in example five was prepared as in example four.
The specific example twelve:
the twelfth example is different from the sixth example in that the mass component added with the retarder is 6 parts.
The retarder in example five was prepared as in example four.
The test method comprises the following steps: the cement samples in the first to twelfth middle-sized examples are prepared into standard samples according to GB/T1346-2011 'test method for water consumption, setting time and stability of standard consistency of cement', and the physical properties of initial setting time, final setting time, viscosity, compression resistance and bending resistance of the samples are measured, and the test results are shown in Table 1.
Table 1 performance parameters for cement samples in examples one-twelfth, the following:
experiments show that: as can be seen from Table 1, the cement samples in the first to twelfth examples obtained by the preparation method of the invention, wherein the fourth to twelfth examples added with the retarder are compared with the first to third examples without the retarder, the initial setting time and the final setting time of the fourth to twelfth cements in the examples are respectively more than 250min and 370 to 390min, the cement samples have the characteristic of better retardation performance, and meanwhile, the cement samples have excellent performances such as standard consistency, 15-day compression resistance, 15-day fracture resistance, 30-day compression resistance and 30-day fracture resistance, and meet the regulations of related rails.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.
Claims (10)
1. The application method of the retarder in cement is characterized in that the retarder comprises the following raw materials: 15-30% of sodium lignosulfonate, 3-15% of a biosurfactant, 15-40% of an inorganic phosphate, 7-20% of an organic phosphonate, 3-10% of tartaric acid and 15-25% of deionized water.
2. The application method of the retarder in cement as claimed in claim 1, wherein the retarder comprises the following components in percentage by weight: 20% sodium lignosulfonate, 10% biosurfactant, 20% inorganic phosphate, 20% organic phosphonate, 8% tartaric acid and 22% deionized water.
3. The application method of the retarder in cement as claimed in claim 1, wherein the retarder comprises the following components in percentage by weight: 20% sodium lignosulfonate, 10% biosurfactant, 25% inorganic phosphate, 15% organic phosphonate, 8% tartaric acid and 15% deionized water.
4. The application method of the retarder in cement as claimed in claim 1, wherein the retarder comprises the following components in percentage by weight: 20% sodium lignosulfonate, 10% biosurfactant, 30% inorganic phosphate, 10% organic phosphonate, 8% tartaric acid and 15% deionized water.
5. The application method of the retarder in cement as claimed in claim 1, wherein the organic phosphonate is methyl phosphate, and the inorganic phosphate is sodium hexametaphosphate.
6. The method for applying the retarder to cement as claimed in claim 1, wherein the retarder is prepared by the following steps:
the method comprises the following steps: putting sodium lignosulfonate, inorganic phosphate, organic phosphonate and tartaric acid in corresponding percentage into deionized water in corresponding percentage to obtain primary retarder mixed liquor;
step two: stirring the primary mixed solution at the temperature of 30-35 ℃ for 30-50 min to obtain a homogenized retarder mixed solution;
step three: adding a corresponding percentage of biosurfactant into the homogenized retarder mixed solution, and stirring for 30min in a constant temperature environment to obtain a forming retarder solution;
step four: atomizing the forming retarder solution into the dried matter, wherein the spraying amount is 15-35 cm3/mL, extruding for 1-2 times by using an extruder, drying for 24-36 h, and finally drying at the temperature of 95-120 ℃ to obtain forming retarder powder.
7. The application method of the retarder in cement as claimed in claim 6, wherein the biosurfactant is polyoxyethylene type nonionic surfactant.
8. The application method of the retarder in cement as claimed in claim 1, wherein the preparation of cement comprises the following raw materials by mass: 65-80 parts of cement clinker, 5-20 parts of fluorgypsum, 3-10 parts of modified phosphogypsum, 10-20 parts of fly ash and 4-6 parts of retarder.
9. The application method of the retarder in cement as claimed in claim 8, wherein the cement clinker comprises the following components by mass: 80 parts of silicate cement clinker, 35 parts of carbonaceous shale, 6 parts of iron raw materials and 5 parts of desulfurized gypsum, wherein the iron raw materials are iron ore and iron tailings, and the mass ratio of the iron raw materials to the iron tailings is 1: 3.
10. The method for applying the retarder to cement as claimed in claim 8, wherein the preparation of the cement comprises the following steps;
the method comprises the following steps: crushing cement clinker by using a roller crusher, selecting a screen with the aperture of 200 mu m to screen out impurities with the diameter of more than 200 mu m, crushing fluorgypsum and modified phosphogypsum by using a jaw crusher, selecting a screen with the aperture of 250 mu m to screen out impurities with the diameter of more than 250 mu m, and selecting a screen with the aperture of 225 mu m to screen out fly ash and retarder to screen out impurities with the diameter of more than 225 mu m in the fly ash and the retarder.
Step two: stirring and mixing cement clinker, fluorgypsum, modified phosphogypsum and fly ash in corresponding mass percentage, wherein the stirring speed is 600-1150 rpm, and the stirring time is 30min, so as to obtain a primary mixed material;
step three: adding the retarder with the corresponding weight part into the preliminary mixed material, mixing and stirring at the stirring speed of 300-850 rpm for 30min to obtain a combined mixed material;
step four: and crushing the combined mixed materials, and pre-homogenizing to obtain the refined cement mixture.
And fifthly, putting the refined cement mixture into a grinding machine with a steel ball for grinding at the rotating speed of 13-22 rpm for 50-80 min.
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| CN202110727657.8A CN113321439A (en) | 2021-06-29 | 2021-06-29 | Application method of retarder in cement |
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| CN202110727657.8A CN113321439A (en) | 2021-06-29 | 2021-06-29 | Application method of retarder in cement |
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Citations (6)
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|---|---|---|---|---|
| CN102584083A (en) * | 2012-02-13 | 2012-07-18 | 刘立文 | Method for preparing high belite cement retarder |
| CN108726904A (en) * | 2018-06-11 | 2018-11-02 | 中国葛洲坝集团水泥有限公司 | A kind of road slow setting cement and preparation method thereof |
| CN109095854A (en) * | 2018-08-31 | 2018-12-28 | 桐乡市羔羊水泥有限公司 | A kind of slow setting cement mixture and its preparation process |
| EP3461800A1 (en) * | 2017-09-28 | 2019-04-03 | HeidelbergCement AG | Retarder for calcium sulfoaluminate belite cement |
| CN110818376A (en) * | 2019-12-13 | 2020-02-21 | 江苏海鼎能源科技发展有限公司 | Novel road retarding cement and preparation method thereof |
| CN111320410A (en) * | 2020-03-23 | 2020-06-23 | 山东莒县江山科技有限公司 | Enhanced cement retarder and preparation method thereof |
-
2021
- 2021-06-29 CN CN202110727657.8A patent/CN113321439A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102584083A (en) * | 2012-02-13 | 2012-07-18 | 刘立文 | Method for preparing high belite cement retarder |
| EP3461800A1 (en) * | 2017-09-28 | 2019-04-03 | HeidelbergCement AG | Retarder for calcium sulfoaluminate belite cement |
| CN108726904A (en) * | 2018-06-11 | 2018-11-02 | 中国葛洲坝集团水泥有限公司 | A kind of road slow setting cement and preparation method thereof |
| CN109095854A (en) * | 2018-08-31 | 2018-12-28 | 桐乡市羔羊水泥有限公司 | A kind of slow setting cement mixture and its preparation process |
| CN110818376A (en) * | 2019-12-13 | 2020-02-21 | 江苏海鼎能源科技发展有限公司 | Novel road retarding cement and preparation method thereof |
| CN111320410A (en) * | 2020-03-23 | 2020-06-23 | 山东莒县江山科技有限公司 | Enhanced cement retarder and preparation method thereof |
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