CN111533481A - Novel concrete water reducing agent and preparation method thereof - Google Patents
Novel concrete water reducing agent and preparation method thereof Download PDFInfo
- Publication number
- CN111533481A CN111533481A CN202010373133.9A CN202010373133A CN111533481A CN 111533481 A CN111533481 A CN 111533481A CN 202010373133 A CN202010373133 A CN 202010373133A CN 111533481 A CN111533481 A CN 111533481A
- Authority
- CN
- China
- Prior art keywords
- parts
- mixture
- agent
- stirring
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- 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
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of concrete water reducing agent preparation, and discloses a novel concrete water reducing agent which comprises the following components in parts by weight: 5-20 parts of modified activated clay, 0.1-0.5 part of defoaming agent, 10-15 parts of antifreeze agent, 5-15 parts of sodium bisulfite, 0.2-2 parts of potassium salt, 8-20 parts of isopropanol, 6-20 parts of air entraining agent and 5-15 parts of water. The antifreeze agent is added into the raw materials, so that the freezing point of water in the concrete can be obviously reduced, no precipitate exists, the pore structure of the concrete is effectively improved, the structural strength of the concrete is improved, the air entraining agent is added, the average pore diameter of air bubbles introduced by the air entraining agent is smaller, the stability of the air bubbles is high, the durability of the concrete can be greatly enhanced, and the collapse degree loss of the concrete is reduced.
Description
Technical Field
The invention relates to the technical field of concrete water reducing agent preparation, in particular to a novel concrete water reducing agent and a preparation method thereof.
Background
The water reducing agent is a concrete admixture capable of reducing the mixing water consumption under the condition of maintaining the slump constant of concrete, most of the water reducing agent belongs to anionic surfactants, and comprises lignosulfonate, naphthalene sulfonate formaldehyde polymer and the like, and after the water reducing agent is added into a concrete mixture, the water reducing agent has a dispersing effect on cement particles, so that the workability of the concrete mixture can be improved, the unit water consumption is reduced, and the fluidity of the concrete mixture is improved; or the unit cement consumption is reduced, and the cement is saved.
However, the concrete water reducing agent prepared by the existing method is difficult to reduce the freezing point of water in the concrete, the pore structure of the concrete cannot be effectively improved, and meanwhile, the existing concrete water reducing agent is difficult to enhance the durability of the concrete, so that the collapse degree loss of the concrete is easily increased. Therefore, the person skilled in the art provides a novel concrete water reducing agent and a preparation method thereof, so as to solve the problems in the background art.
Disclosure of Invention
The invention aims to provide a novel concrete water reducing agent and a preparation method thereof, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a novel concrete water reducing agent comprises the following components in parts by weight: 5-20 parts of modified activated clay, 0.1-0.5 part of defoaming agent, 10-15 parts of antifreeze agent, 5-15 parts of sodium bisulfite, 0.2-2 parts of potassium salt, 8-20 parts of isopropanol, 6-20 parts of air entraining agent and 5-15 parts of water.
As a still further scheme of the invention: the potassium salt is one or a mixture of any two of potassium hydroxide, potassium sulfate, potassium carbonate, potassium cyanide and potassium permanganate.
As a still further scheme of the invention: the preparation method of the modified activated clay comprises the following steps:
A. mixing activated clay and ethanol according to the weight part ratio of 1.1.5, adding ammonium chloride, stirring and reacting at 40-70 ℃ for 5 hours, and removing ethanol by rotary evaporation to obtain an intermediate product;
B. and D, soaking the intermediate product prepared in the step A in a glycyrrhizic acid aqueous solution with the mass fraction of 10-20% at the temperature of 50-60 ℃ for 8 hours, taking out the intermediate product, and drying the intermediate product in a vacuum drying oven at the temperature of 100-120 ℃ for 16 hours to obtain the modified activated clay.
As a still further scheme of the invention: the preparation method of the antifreeze agent comprises the following steps:
a: firstly, taking 15 parts of sodium sulfate, 20 parts of ammonium chloride, 10 parts of barium sulfate, 0.7 part of regulator, 80 parts of water, 10 parts of glucose laurate and 7 parts of sodium lauroyl sarcosinate according to parts by weight for later use, completely pouring the water into a 500ml transparent container, heating to 90 ℃, adding the glucose laurate and the sodium lauroyl sarcosinate, and stirring for 5min to obtain a mixture 1;
b: and (b) when the mixture 1 obtained in the step (a) is cooled to the room temperature of 60 ℃, sequentially adding sodium sulfate, ammonium chloride and barium sulfate, stirring to obtain a mixture 2, standing for 10min, heating to 80 ℃, adding a regulator to regulate the pH value to 11-12 to obtain the antifreeze.
As a still further scheme of the invention: the preparation method of the air entraining agent comprises the following steps: firstly, taking 30 parts of epoxy resin, 15 parts of sodium carbonate, 20 parts of calcium carbonate, 5 parts of dilute sulfuric acid and 40 parts of water according to parts by weight, uniformly stirring the sodium carbonate and the calcium carbonate in a transparent container, then adding water, heating to 60 ℃, finally adding the epoxy resin, continuously stirring for 30min, finally adding the dilute sulfuric acid, and adjusting the pH value to about 9-11 to obtain a finished product.
As a still further scheme of the invention: a preparation method of a novel concrete water reducing agent comprises the following steps:
the method comprises the following steps: weighing various raw materials according to parts by weight for later use, mixing water, potassium salt and sodium bisulfite, pouring isopropanol, heating to 60 ℃, and ensuring continuous stirring in the heating process to obtain a mixture Y;
step two: slowly adding a defoaming agent into the mixture Y in the step one, then adding an antifreeze agent, stirring at a low speed, stirring for 30min, and standing for 1h to obtain a mixture Z;
step three: and slowly dripping the air entraining agent into the mixture Z, heating the mixture Z to 75 ℃, and mixing the mixture at the stirring speed of 80rpm to obtain the finished water reducing agent.
Compared with the prior art, the invention has the beneficial effects that: the antifreeze agent is added into the raw materials, so that the freezing point of water in the concrete can be obviously reduced, no precipitate exists, the pore structure of the concrete is effectively improved, the structural strength of the concrete is improved, the air entraining agent is added, the average pore diameter of air bubbles introduced by the air entraining agent is smaller, the stability of the air bubbles is high, the durability of the concrete can be greatly enhanced, and the collapse degree loss of the concrete is reduced.
Detailed Description
In embodiment 1 of the invention, a novel concrete water reducing agent comprises the following components in parts by weight: 10 parts of modified activated clay, 0.2 part of defoaming agent, 12 parts of antifreeze agent, 8 parts of sodium bisulfite, 0.8 part of potassium salt, 13 parts of isopropanol, 10 parts of air entraining agent and 8 parts of water.
Preferably: the potassium salt is one or a mixture of any two of potassium hydroxide, potassium sulfate, potassium carbonate, potassium cyanide and potassium permanganate.
Preferably: the preparation method of the modified activated clay comprises the following steps:
A. mixing activated clay and ethanol according to the weight part ratio of 1.1.5, adding ammonium chloride, stirring and reacting at 40-70 ℃ for 5 hours, and removing ethanol by rotary evaporation to obtain an intermediate product;
B. and D, soaking the intermediate product prepared in the step A in a glycyrrhizic acid aqueous solution with the mass fraction of 10-20% at the temperature of 50-60 ℃ for 8 hours, taking out the intermediate product, and drying the intermediate product in a vacuum drying oven at the temperature of 100-120 ℃ for 16 hours to obtain the modified activated clay.
Preferably: the preparation method of the antifreeze agent comprises the following steps:
a: firstly, taking 15 parts of sodium sulfate, 20 parts of ammonium chloride, 10 parts of barium sulfate, 0.7 part of regulator, 80 parts of water, 10 parts of glucose laurate and 7 parts of sodium lauroyl sarcosinate according to parts by weight for later use, completely pouring the water into a 500ml transparent container, heating to 90 ℃, adding the glucose laurate and the sodium lauroyl sarcosinate, and stirring for 5min to obtain a mixture 1;
b: and (b) when the mixture 1 obtained in the step (a) is cooled to the room temperature of 60 ℃, sequentially adding sodium sulfate, ammonium chloride and barium sulfate, stirring to obtain a mixture 2, standing for 10min, heating to 80 ℃, adding a regulator to regulate the pH value to 11-12 to obtain the antifreeze.
Preferably: the preparation method of the air entraining agent comprises the following steps: firstly, taking 30 parts of epoxy resin, 15 parts of sodium carbonate, 20 parts of calcium carbonate, 5 parts of dilute sulfuric acid and 40 parts of water according to parts by weight, uniformly stirring the sodium carbonate and the calcium carbonate in a transparent container, then adding water, heating to 60 ℃, finally adding the epoxy resin, continuously stirring for 30min, finally adding the dilute sulfuric acid, and adjusting the pH value to about 9-11 to obtain a finished product.
A preparation method of a novel concrete water reducing agent comprises the following steps:
the method comprises the following steps: weighing various raw materials according to parts by weight for later use, mixing water, potassium salt and sodium bisulfite, pouring isopropanol, heating to 60 ℃, and ensuring continuous stirring in the heating process to obtain a mixture Y;
step two: slowly adding a defoaming agent into the mixture Y in the step one, then adding an antifreeze agent, stirring at a low speed, stirring for 30min, and standing for 1h to obtain a mixture Z;
step three: and slowly dripping the air entraining agent into the mixture Z, heating the mixture Z to 75 ℃, and mixing the mixture at the stirring speed of 80rpm to obtain the finished water reducing agent.
In embodiment 2 of the invention, the novel concrete water reducing agent comprises the following components in parts by weight: 15 parts of modified activated clay, 0.4 part of defoaming agent, 14 parts of antifreeze agent, 13 parts of sodium bisulfite, 1.5 parts of potassium salt, 18 parts of isopropanol, 15 parts of air entraining agent and 13 parts of water.
Preferably: the potassium salt is one or a mixture of any two of potassium hydroxide, potassium sulfate, potassium carbonate, potassium cyanide and potassium permanganate.
Preferably: the preparation method of the modified activated clay comprises the following steps:
A. mixing activated clay and ethanol according to the weight part ratio of 1.1.5, adding ammonium chloride, stirring and reacting at 40-70 ℃ for 5 hours, and removing ethanol by rotary evaporation to obtain an intermediate product;
B. and D, soaking the intermediate product prepared in the step A in a glycyrrhizic acid aqueous solution with the mass fraction of 10-20% at the temperature of 50-60 ℃ for 8 hours, taking out the intermediate product, and drying the intermediate product in a vacuum drying oven at the temperature of 100-120 ℃ for 16 hours to obtain the modified activated clay.
Preferably: the preparation method of the antifreeze agent comprises the following steps:
a: firstly, taking 15 parts of sodium sulfate, 20 parts of ammonium chloride, 10 parts of barium sulfate, 0.7 part of regulator, 80 parts of water, 10 parts of glucose laurate and 7 parts of sodium lauroyl sarcosinate according to parts by weight for later use, completely pouring the water into a 500ml transparent container, heating to 90 ℃, adding the glucose laurate and the sodium lauroyl sarcosinate, and stirring for 5min to obtain a mixture 1;
b: and (b) when the mixture 1 obtained in the step (a) is cooled to the room temperature of 60 ℃, sequentially adding sodium sulfate, ammonium chloride and barium sulfate, stirring to obtain a mixture 2, standing for 10min, heating to 80 ℃, adding a regulator to regulate the pH value to 11-12 to obtain the antifreeze.
Preferably: the preparation method of the air entraining agent comprises the following steps: firstly, taking 30 parts of epoxy resin, 15 parts of sodium carbonate, 20 parts of calcium carbonate, 5 parts of dilute sulfuric acid and 40 parts of water according to parts by weight, uniformly stirring the sodium carbonate and the calcium carbonate in a transparent container, then adding water, heating to 60 ℃, finally adding the epoxy resin, continuously stirring for 30min, finally adding the dilute sulfuric acid, and adjusting the pH value to about 9-11 to obtain a finished product.
A preparation method of a novel concrete water reducing agent comprises the following steps:
the method comprises the following steps: weighing various raw materials according to parts by weight for later use, mixing water, potassium salt and sodium bisulfite, pouring isopropanol, heating to 60 ℃, and ensuring continuous stirring in the heating process to obtain a mixture Y;
step two: slowly adding a defoaming agent into the mixture Y in the step one, then adding an antifreeze agent, stirring at a low speed, stirring for 30min, and standing for 1h to obtain a mixture Z;
step three: and slowly dripping the air entraining agent into the mixture Z, heating the mixture Z to 75 ℃, and mixing the mixture at the stirring speed of 80rpm to obtain the finished water reducing agent.
In order to verify that the performance of the concrete water reducing agent prepared in the application document is superior to that of the conventional concrete water reducing agent on the market, the concrete water reducing agent prepared in the application document is compared with the conventional concrete water reducing agent on the market, and the comparison result is shown in the following table:
| common water reducing agent | Example 1 | Example 2 | ||
| Compressive strength/MPa | 10d | 41.2 | 42.3 | 43.6 |
| Degree of durability | 33.1 | 34.8 | 35.3 | |
| Collapse time/s | 3.8 | 3.5 | 3.4 | |
| Content of air/%) | 2.6 | 1.4 | 1.7 |
From the above table, it can be seen that: the concrete water reducing agent is added with the antifreeze and the air entraining agent, the compressive strength of the concrete water reducing agent can reach 42.3MPa and 43.6MPa in 10 days, the concrete water reducing agent is superior to a common water reducing agent, the gas content is 1.4 percent and 1.7 percent, the gas content is also superior to 2.6 percent of the common water reducing agent, and the collapse time is 3.5s and 3.4s in the same time, which shows that the water reducing agent prepared by the invention has stronger collapse protection performance and excellent compressive strength.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (6)
1. The novel concrete water reducing agent is characterized by comprising the following components in parts by weight: 5-20 parts of modified activated clay, 0.1-0.5 part of defoaming agent, 10-15 parts of antifreeze agent, 5-15 parts of sodium bisulfite, 0.2-2 parts of potassium salt, 8-20 parts of isopropanol, 6-20 parts of air entraining agent and 5-15 parts of water.
2. The novel concrete water reducer according to claim 1, wherein the potassium salt is one or a mixture of any two of potassium hydroxide, potassium sulfate, potassium carbonate, potassium cyanide and potassium permanganate.
3. The novel concrete water reducing agent according to claim 1, characterized in that the preparation method of the modified activated clay comprises the following steps:
A. mixing activated clay and ethanol according to the weight part ratio of 1.1.5, adding ammonium chloride, stirring and reacting at 40-70 ℃ for 5 hours, and removing ethanol by rotary evaporation to obtain an intermediate product;
B. and D, soaking the intermediate product prepared in the step A in a glycyrrhizic acid aqueous solution with the mass fraction of 10-20% at the temperature of 50-60 ℃ for 8 hours, taking out the intermediate product, and drying the intermediate product in a vacuum drying oven at the temperature of 100-120 ℃ for 16 hours to obtain the modified activated clay.
4. The novel concrete water reducing agent of claim 1, characterized in that the antifreeze agent is prepared by the following steps:
a: firstly, taking 15 parts of sodium sulfate, 20 parts of ammonium chloride, 10 parts of barium sulfate, 0.7 part of regulator, 80 parts of water, 10 parts of glucose laurate and 7 parts of sodium lauroyl sarcosinate according to parts by weight for later use, completely pouring the water into a 500ml transparent container, heating to 90 ℃, adding the glucose laurate and the sodium lauroyl sarcosinate, and stirring for 5min to obtain a mixture 1;
b: and (b) when the mixture 1 obtained in the step (a) is cooled to the room temperature of 60 ℃, sequentially adding sodium sulfate, ammonium chloride and barium sulfate, stirring to obtain a mixture 2, standing for 10min, heating to 80 ℃, adding a regulator to regulate the pH value to 11-12 to obtain the antifreeze.
5. The novel concrete water reducer according to claim 1, characterized in that the air entraining agent is prepared by the following method: firstly, taking 30 parts of epoxy resin, 15 parts of sodium carbonate, 20 parts of calcium carbonate, 5 parts of dilute sulfuric acid and 40 parts of water according to parts by weight, uniformly stirring the sodium carbonate and the calcium carbonate in a transparent container, then adding water, heating to 60 ℃, finally adding the epoxy resin, continuously stirring for 30min, finally adding the dilute sulfuric acid, and adjusting the pH value to about 9-11 to obtain a finished product.
6. The preparation method of the novel concrete water reducer according to any one of claims 1 to 5, characterized by comprising the following steps:
the method comprises the following steps: weighing various raw materials according to parts by weight for later use, mixing water, potassium salt and sodium bisulfite, pouring isopropanol, heating to 60 ℃, and ensuring continuous stirring in the heating process to obtain a mixture Y;
step two: slowly adding a defoaming agent into the mixture Y in the step one, then adding an antifreeze agent, stirring at a low speed, stirring for 30min, and standing for 1h to obtain a mixture Z;
step three: and slowly dripping the air entraining agent into the mixture Z, heating the mixture Z to 75 ℃, and mixing the mixture at the stirring speed of 80rpm to obtain the finished water reducing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010373133.9A CN111533481A (en) | 2020-05-06 | 2020-05-06 | Novel concrete water reducing agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010373133.9A CN111533481A (en) | 2020-05-06 | 2020-05-06 | Novel concrete water reducing agent and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111533481A true CN111533481A (en) | 2020-08-14 |
Family
ID=71971651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010373133.9A Pending CN111533481A (en) | 2020-05-06 | 2020-05-06 | Novel concrete water reducing agent and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111533481A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114031327A (en) * | 2021-12-10 | 2022-02-11 | 武安市浩泽环保科技有限公司 | High-activity stone powder-based concrete additive |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101497507A (en) * | 2009-03-20 | 2009-08-05 | 武汉市联合石油化工有限责任公司 | High-early strength antifreezing polycarboxylate high performance water reducing agent and preparation |
| CN106396458A (en) * | 2016-09-28 | 2017-02-15 | 四会市恒星智能科技有限公司 | Highly efficient composite concrete anti-freezing agent and preparation method thereof |
| CN109279804A (en) * | 2018-09-18 | 2019-01-29 | 魏菊宁 | A kind of environment-friendly concrete water-reducing agent and preparation method thereof |
-
2020
- 2020-05-06 CN CN202010373133.9A patent/CN111533481A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101497507A (en) * | 2009-03-20 | 2009-08-05 | 武汉市联合石油化工有限责任公司 | High-early strength antifreezing polycarboxylate high performance water reducing agent and preparation |
| CN106396458A (en) * | 2016-09-28 | 2017-02-15 | 四会市恒星智能科技有限公司 | Highly efficient composite concrete anti-freezing agent and preparation method thereof |
| CN109279804A (en) * | 2018-09-18 | 2019-01-29 | 魏菊宁 | A kind of environment-friendly concrete water-reducing agent and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 张巨松: "《混凝土原材料》", 31 January 2019, 哈尔滨工业大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114031327A (en) * | 2021-12-10 | 2022-02-11 | 武安市浩泽环保科技有限公司 | High-activity stone powder-based concrete additive |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108911567B (en) | Special additive for high-strength concrete and preparation method thereof | |
| CN103451026A (en) | Modified glutaraldehyde tanning agent and preparation method and applications thereof | |
| CN108046651B (en) | Concrete super retarder | |
| CN106477943B (en) | A kind of composite cement admixture | |
| CN103601881A (en) | Functional polyether and method for preparing water reducer by using same | |
| CN111533481A (en) | Novel concrete water reducing agent and preparation method thereof | |
| CN107601945B (en) | Preparation method of carboxyl-containing modified chitin bio-based retarding superplasticizer | |
| CN110698612A (en) | Viscosity-reducing polycarboxylate-type water reducer mother liquor, water reducer and preparation method | |
| CN108101406B (en) | Super early strength concrete early strength agent and preparation method thereof | |
| CN111943603B (en) | Low-shrinkage high-strength concrete and preparation method thereof | |
| CN108191288B (en) | High slump loss resistant type polycarboxylic acid high-performance water reducing agent and preparation method thereof | |
| CN109721271B (en) | Polycarboxylate water reducing agent composition for self-compacting high-workability concrete | |
| CN108046637B (en) | Early strength water reducing agent and preparation method thereof | |
| CN111320415A (en) | Environment-friendly composite antifreezing pumping aid and preparation method thereof | |
| CN104530325B (en) | A kind of preparation method of high-performance polycarboxylic acids water reducing agent | |
| CN102745936A (en) | Oxidized lignosulfonate-aliphatic copolymer efficient water reducer and preparation method thereof | |
| CN108975758A (en) | Foam concrete special additive | |
| CN108298862B (en) | Preparation method of mortar thickening agent | |
| CN109020290B (en) | Modified water reducing agent and preparation method thereof | |
| CN106746885A (en) | A kind of cement water reducing agent and preparation method thereof | |
| CN110922777B (en) | Light composite partition board and processing technology thereof | |
| CN113278215A (en) | Polyethylene foam material and preparation method thereof | |
| CN113773450A (en) | Low-temperature low-sensitivity strong-adsorption type polycarboxylate superplasticizer and preparation method thereof | |
| CN111763029A (en) | Foaming agent capable of reducing water absorption of foam mixed light soil | |
| CN111548048A (en) | Shrinkage-reducing concrete high-efficiency water reducing agent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200814 |