CN111116087A - Concrete waste treatment process - Google Patents
Concrete waste treatment process Download PDFInfo
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- CN111116087A CN111116087A CN201911399341.XA CN201911399341A CN111116087A CN 111116087 A CN111116087 A CN 111116087A CN 201911399341 A CN201911399341 A CN 201911399341A CN 111116087 A CN111116087 A CN 111116087A
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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
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a concrete waste treatment process, which comprises the following steps: adding a waste treatment agent into the waste concrete, stirring until the waste treatment agent is granulated, discharging to obtain waste concrete aggregate, and storing for later use; the residual waste treating agent is packaged in different weights according to different adding amounts. According to the concrete waste treatment process, the waste treatment agent is used, so that the concrete waste is solved at one time, the waste concrete aggregate is formed, and the waste concrete aggregate can be recycled for preparing concrete, so that the waste treatment process has the advantages of no sewage discharge, energy saving and environmental protection. This application remains waste material treating agent through the solidification that absorbs water, makes cement mortar rapid dehydration solidification in the short time, loses the mobility, and the parcel adheres in the stone surface, forms but recycle's remains waste material concrete aggregate.
Description
Technical Field
The invention relates to a waste treatment process, in particular to a waste treatment process for fresh concrete.
Background
The concrete residual waste refers to concrete which cannot be discharged after the concrete mixer truck discharges the concrete or waste concrete which is transported to a construction site but loses workability and cannot be subjected to pumping construction; in a concrete mixing plant, the waste concrete is usually treated by washing and separating sand and stones for recycling, and the cement, fly ash, mineral powder and other gelled materials are treated together with wastewater, so that resources are wasted and the environment is polluted.
Disclosure of Invention
Based on the above, the invention aims to overcome the defects of the prior art and provide a treatment process of the waste material of fresh concrete; the treatment process produces concrete waste aggregate, replaces a part of coarse aggregate to prepare concrete, solves the problem of concrete waste at one time, does not discharge sewage and solid construction waste, and is economical and environment-friendly.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a concrete waste treatment process comprises the following steps: adding a waste treatment agent into the waste concrete, stirring until the waste treatment agent is granulated, and discharging to obtain concrete waste aggregate for later use; the residual waste treating agent is packaged in different weights according to different adding amounts; the waste treatment agent comprises the following components in parts by weight: 20-100 parts of high water absorption high polymer and 5-50 parts of crystal nucleus type cement hydration accelerator; the molecular weight of the high-water-absorption high polymer is 10-5000 ten thousand.
The waste material treating agent is added into waste material concrete, in the waste material mixture, a water-absorbing high polymer material has a large amount of negative charges, generates electrostatic attraction with cement with positive charges and particles of cement hydration products to form a physically cross-linked net structure, and in addition, the molecular chains of polymers are mutually wound, so that the net structure has the strong function of combining and solidifying water when contacting with water, so that the concrete is dehydrated and solidified in a very short time and is wrapped on the surface of a stone to form a dry granular material. The nano calcium silicate hydrate or nano calcium aluminosilicate hydrate is used as a crystal seed to form a crystal nucleus, and the growth of enantiomer crystals with the same crystal form or three-dimensional configuration is accelerated or promoted, so that the cement hydration is accelerated, a large amount of free water is consumed, the cement paste solidification is promoted, the early strength of the concrete is improved, and the concrete early strength agent is a special and effective concrete early strength agent. The treatment process is an effective treatment method with low cost and high effect, solves the problems of concrete waste at one time, does not discharge waste water and solid construction waste, saves resources, protects the environment and has great economic and social significance.
Preferably, the concrete waste treatment agent comprises the following components in parts by weight: 30-95 parts of high water absorption high polymer and 5-40 parts of crystal nucleus type cement hydration accelerator.
More preferably, the concrete waste treatment agent comprises the following components in parts by weight: 50-95 parts of high water absorption high polymer and 10-30 parts of crystal nucleus type cement hydration accelerator.
The residual waste treating agent has the main functions of water absorption and solidification, so that cement mortar is rapidly dehydrated and solidified in a short time, loses fluidity, forms particles, wraps and adheres to the surface of stone, and forms recyclable concrete aggregate; specifically, the effects of the components are as follows:
high water absorption high molecular polymer: (1) water absorption: after the water-soluble polymer is put into the waste concrete, a large amount of water is absorbed to swell and dissolve; (2) electric double layer and hydrogen bonding: the water-soluble polymer is hydrolyzed into charged colloid, and forms a micelle with a double-layer structure with surrounding ions, and simultaneously forms hydrogen bonds with water molecules, so that a large amount of free water is consumed; (3) adsorption and bridging effects: the linear structure macromolecule has chemical groups which can act with some parts of the surface of the colloidal particle, when the macromolecule is contacted with the colloidal particle, the groups can generate special chemical reaction with the surface of the colloidal particle to be adsorbed mutually, while the rest of the macromolecule extends into the aqueous solution to be adsorbed with another colloidal particle with a vacancy on the surface, and the polymer plays a role of bridging connection.
Crystal nucleus type cement hydration accelerator: as a seed crystal, the cement hydration is obviously promoted, and the early strength of the concrete is improved.
Preferably, the concrete waste treatment agent is in a solid powder form.
Preferably, the water-absorbing high polymer is at least one of sodium polyacrylate, polyacrylamide, polymethacrylamide, polyacrylamide copolymer and derivatives thereof, and polyvinylpyrrolidone.
Preferably, the crystal nucleus type cement hydration accelerator is nano calcium silicate hydrate or nano calcium aluminosilicate hydrate. Has the functions of obviously promoting cement hydration and improving the early strength of concrete.
Preferably, the waste treatment agent is packaged in different qualities by a water-soluble packaging material; when the water-soluble waste concrete treating agent is used, the whole bag of the treating agent is added into the waste concrete, and the water-soluble packaging bag is dissolved in the concrete.
The waste treatment agent can be packaged in small bags with different masses, and the packaging bags are made of water-soluble materials; when in use, the waste concrete is put into the waste concrete together with the waste treatment agent, and is dissolved in the concrete through water dissolution in the stirring process; or packaging with big common packaging bag.
Preferably, the dosage of the waste treatment agent is 0.01-2.5% of the total mass of the concrete waste.
The mixing amount of the waste treatment agent is different along with the state, the application, the grade and the like of waste concrete, for example, the concrete waste with short machine-out time or high water-cement ratio has large water content and high consumption of the treatment agent for forming granular aggregate, the concrete waste with long machine-out time or low water-cement ratio or high-grade concrete waste has low water content and low consumption of the treatment agent for forming granular aggregate, but the mixing ratio of the concrete waste treated by the treatment agent and the concrete is irrelevant.
Preferably, the concrete waste is one or more of (1) to (9):
(1) residual concrete which cannot be discharged after the concrete mixer truck discharges the materials;
(2) the waste concrete which is transported to a construction site but loses workability and cannot be constructed by pumping;
(3) transporting the concrete to a construction site, and finding that the concrete needs to be returned to a manufacturer when a wrong material is delivered or a wrong material is required by a customer;
(4) waste concrete produced by concrete manufacturers in laboratory tests;
(5) a concrete manufacturer samples and detects the waste concrete of the concrete quality;
(6) material leakage during production of concrete manufacturers;
(7) the waste concrete produced by concrete-related engineering testing centers and research institutes for testing and research purposes;
(8) concrete waste materials generated in a production plant for producing tubular piles, pipe pieces and prefabricated concrete products;
(9) other concrete and cement admixtures containing recycled aggregate.
Thirdly, the invention also provides a preparation method of concrete, which is characterized in that the waste concrete aggregate prepared by the concrete waste treatment process is used as a coarse aggregate to replace natural stones, and the coarse aggregate is recycled to prepare the concrete; the substitution rate of the coarse aggregate for substituting natural stones is 0-50%.
In tests, the concrete waste aggregate produced by the process disclosed by the application is lower than (including) 50% in the amount of replacing the coarse aggregate, the mixing water dosage and the admixture dosage are not influenced, the concrete workability and the durability are not influenced, and when the stone substitution rate exceeds 50%, the concrete fluidity is reduced, and the mixing water dosage is increased. The aggregate produced by the process contains water-soluble high molecular polymer, has no influence on hydration of cement water and crystal growth, is beneficial to improving the toughness of concrete, does not increase the using amount of mixing water and the mixing amount of an additive, and has no adverse influence on the workability of fresh concrete and the strength and durability of hardened concrete.
Compared with the prior art, the invention has the beneficial effects that:
this application remains waste treating agent through the solidification of absorbing water, makes the mortar lose water rapidly in the short time and solidifies, loses the mobility, forms the graininess, and the parcel adheres to the stone surface, forms but recycle's concrete remains waste aggregate.
The concrete waste treatment process disclosed by the invention can be used for solving the problem of concrete waste at one time, has no sewage discharge, saves the cost, and is energy-saving and environment-friendly; the aggregate produced by the process contains water-soluble high molecular polymer, has no influence on hydration of cement water and crystal growth, and is beneficial to improving the toughness of concrete; the granular material produced by the process can be recycled as aggregate to replace part of natural stones, so that the cost is saved and remarkable economic benefit is generated.
Drawings
FIG. 1 is a state view of concrete used as concrete waste according to the present invention;
FIG. 2 is a diagram showing the state of the discharge of the concrete aggregate prepared from the concrete waste according to the present invention;
FIG. 3 is a diagram showing a dry state of the concrete aggregate prepared from the concrete waste according to the present invention.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to the accompanying drawings and specific embodiments. In the examples, the preparation method of nano calcium silicate hydrate or nano calcium aluminosilicate hydrate can be specifically referred to patent CN 103449460A. In addition, the molecular weights referred to in the present application are number average molecular weights, and the present application is set as examples 1 to 5, and the concrete mixing ratio and slump used as concrete waste in examples 1 to 5 are shown in table 1.
TABLE 1 preparation and Properties of concrete waste aggregates in examples 1 to 5 (material amount unit: kg)
Example 1
In an embodiment of the concrete waste treatment process of the present invention, the concrete waste treatment process of the embodiment includes: adding the waste treatment agent packaged by the water-soluble packaging material into the concrete waste, then stirring the mixture until the mixture is granular, and discharging the mixture to obtain concrete material; the using amount of the waste treatment agent is 0.40 percent of the total mass of the concrete waste;
the concrete waste treating agent is solid powder and comprises the following components in parts by weight: 100 parts of high water absorption high polymer and 5 parts of crystal nucleus type cement hydration accelerator; the water-absorbing high polymer is polyacrylamide, the molecular weight of the high water-absorbing high polymer is 120 ten thousand, and the crystal nucleus type cement hydration accelerator is nano calcium silicate hydrate.
The waste treating agent can be packaged in small bags with different masses, and the packaging bags are made of water-soluble materials; when in use, the waste concrete is put into the waste concrete together with the waste treatment agent and dissolved in water during stirring; or packaging with big common packaging bag.
The concrete waste was the concrete prepared in the first set of mix proportions in table 1 and used as waste.
Example 2
In an embodiment of the concrete waste treatment process of the present invention, the concrete waste treatment process of the embodiment includes: adding the waste treatment agent packaged by the water-soluble packaging material into the concrete waste, then stirring the mixture until the mixture is granular, pouring out and unloading the mixture to obtain a concrete material; the using amount of the waste treating agent is 0.55 percent of the total mass of the concrete waste;
the concrete waste treating agent is solid powder and comprises the following components in parts by weight: 95 parts of high water absorption high polymer and 10 parts of crystal nucleus type cement hydration accelerator; the water-absorbing high polymer is a mixture of polyacrylamide and sodium polyacrylate, and the mixing weight ratio is (80: 20); the molecular weight of the high water absorption high molecular polymer is 10 ten thousand, and the crystal nucleus type cement hydration accelerator is nano hydrated calcium aluminosilicate.
The waste treating agent can be packaged in small bags with different masses, and the packaging bags are made of water-soluble materials; when in use, the waste concrete is put into the waste concrete together with the waste treatment agent and dissolved in water during stirring; or packaging with big common packaging bag.
The concrete waste is the concrete prepared according to the second group of mixing proportion in the table 1 and is used as the waste.
Example 3
In an embodiment of the concrete waste treatment process of the present invention, the concrete waste treatment process of this embodiment includes: adding the waste treatment agent packaged by the water-soluble packaging material into the concrete waste, then stirring the mixture until the mixture is granular, pouring out and unloading the mixture to obtain a concrete material; the using amount of the waste treatment agent is 0.15 percent of the total mass of the concrete waste;
the concrete waste treating agent is powdery and comprises the following components in parts by weight: 90 parts of high water absorption high polymer and 20 parts of crystal nucleus type cement hydration accelerator; the water-absorbing high polymer is polymethacrylamide; the molecular weight of the high-water-absorption high polymer is 75 ten thousand, and the crystal nucleus type cement hydration accelerator is nano calcium silicate hydrate.
The waste treating agent can be packaged in small bags with different masses, and the packaging bags are made of water-soluble materials; when in use, the waste concrete is put into the waste concrete together with the waste treatment agent and dissolved in water during stirring; or packaging with big common packaging bag.
The concrete waste is the concrete prepared according to the third group of mixing proportion in the table 1 and is used as the waste.
Example 4
In one embodiment of the concrete waste treatment process of the present invention, the concrete waste treatment process comprises: adding the residual waste treatment agent packaged by a water-soluble packaging material into the concrete residual waste, then stirring the mixture until the mixture is granular, pouring out the mixture and discharging the mixture to obtain a concrete material; the dosage of the waste treatment agent is 0.06 percent of the total mass of the concrete waste;
the concrete waste treating agent is powdery and comprises the following components in parts by weight: 50 parts of high water absorption high polymer and 30 parts of crystal nucleus type cement hydration accelerator; the water-absorbing high polymer is a mixture of polyvinylpyrrolidone, sodium polyacrylate and polyacrylamide, and the weight ratio of the polyvinylpyrrolidone to the sodium polyacrylate to the polyacrylamide is 20:20: 60; the molecular weight of the high water absorption high molecular polymer is 25 ten thousand, and the crystal nucleus type cement hydration accelerator is nano hydrated calcium aluminosilicate.
The waste treating agent can be packaged in small bags with different masses, and the packaging bags are made of water-soluble materials; when in use, the waste concrete is put into the waste concrete together with the waste treatment agent and dissolved in water during stirring; or packaging with big common packaging bag.
The concrete waste is the concrete prepared by the fourth group of mixing proportion in the table 1 and is used as the waste.
Example 5
In one embodiment of the concrete waste treatment process of the present invention, the concrete waste treatment process comprises: adding the residual waste treatment agent packaged by a water-soluble packaging material into the concrete residual waste, then stirring the mixture until the mixture is granular, pouring out the mixture and discharging the mixture to obtain a concrete material; the using amount of the waste treatment agent is 2.5 percent of the total mass of the concrete waste;
the concrete waste treating agent is powdery and comprises the following components in parts by weight: 20 parts of high water absorption high polymer and 50 parts of crystal nucleus type cement hydration accelerator; the water-absorbing high polymer is polyvinylpyrrolidone; the molecular weight of the high water absorption high molecular polymer is 15 ten thousand, and the crystal nucleus type cement hydration accelerator is nano hydrated calcium aluminosilicate.
The waste treating agent can be packaged in small bags with different masses, and the packaging bags are made of water-soluble materials; when in use, the waste concrete is put into the waste concrete together with the waste treatment agent and dissolved in water during stirring; or packaging with big common packaging bag.
The concrete waste is concrete prepared according to the fifth mixing proportion in the table 1 and is used as waste.
The waste concrete aggregate prepared by the concrete waste treatment process in the embodiment 1-5 is used as a coarse aggregate to replace natural stones, and is recycled to prepare concrete; the substitution rate of the coarse aggregate for substituting the natural stones is 50 percent; in addition, a comparative example was set, wherein the concrete of the comparative example only contained natural stones and no waste concrete aggregate, the concrete formulation is shown in table 2, and the concrete properties are shown in table 3:
TABLE 2 concrete mix proportion (material dosage unit: kg)
TABLE 3 concrete Properties
As can be seen from Table 3, compared with the comparative example, the use of the granular material produced by the process of the present invention as a coarse aggregate instead of 50% of natural stone for the preparation of concrete did not increase the amount of mixing water and the amount of admixture, and had no adverse effect on the workability of fresh concrete and the strength of hardened concrete.
In order to study the influence of the waste treatment agents with different formulas on the process treatment, the application sets experiment groups 1-10, the mixing ratio of the processes in the experiment groups 1-10 and the concrete used as the concrete waste is the same as that in the example 1 in the table 1, except that the contents of the super-absorbent high polymer and the crystal nucleus type cement hydration accelerator in the treatment agents are different, and the concrete contents are shown in the table 4:
TABLE 4
As can be seen from Table 4, when the content of the super absorbent polymer is controlled to be constant, the water absorption and solidification effects of the treating agent are better when the content of the crystal nucleus type cement hydration accelerator is 10-30 parts; when the content of the crystal nucleus type cement hydration accelerator is controlled to be constant, and when the content of the high water absorption high polymer is 50-95 parts, the water absorption curing effect of the treating agent is better; therefore, the concrete waste treatment agent of the present application preferably comprises 50 to 95 parts of a high water-absorbing polymer and 10 to 30 parts of a nuclear cement hydration accelerator.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The concrete waste treatment process is characterized by comprising the following steps: adding a waste treatment agent into the waste concrete, stirring until the waste treatment agent is granulated, discharging to obtain waste concrete aggregate, and storing for later use; the residual waste treating agent is packaged in different weights according to different adding amounts;
the waste treatment agent comprises the following components in parts by weight: 20-100 parts of high water absorption high polymer and 5-50 parts of crystal nucleus type cement hydration accelerator; the molecular weight of the high-water-absorption high polymer is 10-5000 ten thousand.
2. The concrete waste treatment process according to claim 1, comprising the following components in parts by weight: 30-95 parts of high water absorption high polymer and 5-40 parts of crystal nucleus type cement hydration accelerator.
3. The concrete waste treatment process according to claim 2, comprising the following components in parts by weight: 50-90 parts of high water absorption high polymer and 10-30 parts of crystal nucleus type cement hydration accelerator.
4. The concrete waste treatment process of claim 1, wherein the concrete waste treatment agent is in the form of a solid powder.
5. The process for treating the concrete wastes according to claim 1, wherein the water-absorbing high-molecular polymer is at least one of sodium polyacrylate, polyacrylamide, polymethacrylamide, polyacrylamide copolymer and its derivatives, and polyvinylpyrrolidone.
6. The concrete waste treatment process according to claim 1, wherein the nucleation type cement hydration accelerator is nano calcium silicate hydrate or nano calcium aluminosilicate hydrate.
7. The concrete waste treatment process of claim 1, wherein the waste treatment agent is packaged in different qualities by a water soluble packaging material; when the water-soluble waste concrete treating agent is used, the whole bag of the treating agent is added into the waste concrete, and the water-soluble packaging bag is dissolved in the concrete.
8. The concrete waste treatment process according to claim 1, wherein the amount of the waste treatment agent is 0.01 to 2.5% of the total mass of the concrete waste.
9. The concrete waste treatment process according to claim 1, wherein the concrete waste is one or more of (1) to (9):
(1) residual concrete which cannot be discharged after the concrete mixer truck discharges the materials;
(2) the waste concrete which is transported to a construction site but loses workability and cannot be constructed by pumping;
(3) transporting the concrete to a construction site, and finding that the concrete needs to be returned to a manufacturer when a wrong material is delivered or a wrong material is required by a customer;
(4) waste concrete produced by concrete manufacturers in laboratory tests;
(5) a concrete manufacturer samples and detects the waste concrete of the concrete quality;
(6) material leakage during production of concrete manufacturers;
(7) the waste concrete produced by concrete-related engineering testing centers and research institutes for testing and research purposes;
(8) concrete waste materials generated in a production plant for producing tubular piles, pipe pieces and prefabricated concrete products;
(9) other concrete and cement admixtures containing recycled aggregate.
10. The preparation method of the concrete is characterized in that the waste concrete aggregate prepared by the concrete waste treatment process of any one of claims 1 to 9 is used as a coarse aggregate to replace natural stones and is recycled to prepare the concrete; the substitution rate of the coarse aggregate for substituting natural stones is 0-50%.
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| CN201911399341.XA CN111116087A (en) | 2019-12-30 | 2019-12-30 | Concrete waste treatment process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115893895A (en) * | 2023-01-09 | 2023-04-04 | 石家庄市长安育才建材有限公司 | Coagulation accelerating early strength agent, preparation method thereof and concrete composition |
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| CN101607812A (en) * | 2009-07-16 | 2009-12-23 | 王军 | A kind of compound curing agent of high cement slurry |
| JP2014505006A (en) * | 2010-12-21 | 2014-02-27 | マペイ ソシエタ ペル アチオニ | Method for producing aggregate from cement composition |
| CN109534763A (en) * | 2017-09-22 | 2019-03-29 | 高康占 | A kind of dry particle and its application |
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2019
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| CN1043487A (en) * | 1988-12-19 | 1990-07-04 | 钱根成 | The concrete making method of slag structure material |
| CN101607812A (en) * | 2009-07-16 | 2009-12-23 | 王军 | A kind of compound curing agent of high cement slurry |
| JP2014505006A (en) * | 2010-12-21 | 2014-02-27 | マペイ ソシエタ ペル アチオニ | Method for producing aggregate from cement composition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115893895A (en) * | 2023-01-09 | 2023-04-04 | 石家庄市长安育才建材有限公司 | Coagulation accelerating early strength agent, preparation method thereof and concrete composition |
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Application publication date: 20200508 |