CN111908824B - Composite concrete admixture and preparation method and application thereof - Google Patents
Composite concrete admixture and preparation method and application thereof Download PDFInfo
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- CN111908824B CN111908824B CN202010450920.9A CN202010450920A CN111908824B CN 111908824 B CN111908824 B CN 111908824B CN 202010450920 A CN202010450920 A CN 202010450920A CN 111908824 B CN111908824 B CN 111908824B
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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
- 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
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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
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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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
Abstract
The invention relates to a composite concrete admixture which comprises the following components in parts by weight: 5-8 parts of a polycarboxylic acid water reducing agent, 6-14 parts of a slow-release polycarboxylic acid water reducing agent, 3-4.5 parts of a saccharide retarder, 0-0.5 part of an organic acid retarder and 0.5-1 part of an inorganic acid retarder. The retarder comprises a saccharide retarder, an organic acid retarder and an inorganic acid retarder, and has the functions of inhibiting cement hydration in the early stage, slowing down the hydration speed of the cement, reducing the consumption speed of water in concrete, reducing the dosage of a slow-release water reducing agent and enabling the release speed of the slow-release water reducing agent to be matched with the hydration speed of the cement. The effect of each retarder is different, the setting time of concrete is not obviously delayed, and the hydration of cement can be inhibited in the early stage.
Description
Technical Field
The invention relates to the field of concrete and cement products, in particular to a composite concrete admixture, a preparation method and application thereof.
Background
Concrete is a main material of modern construction engineering, the volume of concrete poured in China reaches billions every year, and the large production capacity enables the concrete to be intensively mixed into a main production mode. The transportation and pouring process of the concrete after centralized mixing needs a period of time, which is usually more than 1 hour or even longer, and the maintenance of the workability of the concrete mixture during the period of time can bring serious influence on the efficacy and quality of concrete pouring. If the holding time is insufficient, the construction and pouring on site are difficult, construction interruption can be caused, the construction efficiency is seriously influenced, and the conditions of on-site water adding, construction cold joint, incompact and the like which deteriorate the quality of concrete can also be caused. Concrete workability retention time is a matter of great concern to technicians in this industry.
The loss of workability of concrete is caused by the loss of workability due to the loss of water by hydration of cement, the reduction of free water in concrete and the increase of the specific surface area of concrete mixtures, which reduces the fluidity and plasticity of concrete. Therefore, even if a common polycarboxylic acid water reducing agent is added when concrete is formulated, there is still a problem of loss of workability of concrete. Water reducer technology is often used by those skilled in the art to amplify the effect of water to maintain concrete fluidity for a certain period of time.
At present, a concrete water reducing agent mainly uses a polycarboxylic acid water reducing agent, and two methods are used for prolonging the workability time of concrete:
(1) then adding a certain amount of common polycarboxylic acid water reducing agent. The common polycarboxylic acid water reducing agent can play a role immediately after being mixed into concrete, so that the fluidity of the concrete is enlarged, but as the free water in the cement hydrated concrete is consumed and the specific surface area of a concrete mixture is increased, the amount of the water reducing agent is not enough to ensure that the concrete can achieve the fluidity for construction. Since the addition of an excessive amount of a polycarboxylic acid water-reducing agent in the preparation of concrete causes severe segregation bleeding, an excessive amount of a conventional polycarboxylic acid water-reducing agent cannot be added in the preparation. The common method during construction is that after the concrete is transported to the site, when the slump is obviously lost, a certain amount of water reducing agent is added to solve the problem that the workability of the concrete cannot meet the requirement. Depending on the transportation and casting time constraints, it is often necessary to add the water reducing agent twice or even three times. However, this method requires a skilled worker on site to have a lot of experience, and the excessive addition of the water reducing agent causes serious segregation, bleeding or floating of concrete, which causes serious quality defects in construction, or causes serious waste due to waste of concrete. Therefore, the method of adding the ordinary polycarboxylic acid water reducing agent later cannot solve the fundamental problem.
(2) Because the amount of the water reducing agent can not be determined by tests in advance after the site, the problem of insufficient working retention time of concrete can not be really solved, and the slow-release type polycarboxylate water reducing agent is invented. It is believed that this type of water reducer does not immediately serve to amplify water upon addition to concrete, and requires a chemical reaction process to slowly release the common polycarboxylate water reducer, just to replenish the common polycarboxylate water reducer at a critical time. The dosage of the slow-release type polycarboxylate superplasticizer which needs to be added when the concrete is prepared can be determined through experiments. This solves the problem of adding water reducing agent twice or three times. However, the release speed of the slow-release type polycarboxylate superplasticizer is greatly influenced by temperature, and the release speed is greatly different between high temperature and low temperature; in addition, the time for concrete to lose fluidity due to the hydration speed of cement is not only influenced by the temperature, but also influenced by various factors such as the variety of cement, the water-cement ratio, the variety and the mixing amount of mineral admixture such as fly ash and the like, the two speeds cannot be perfectly matched, great uncertainty is brought to the action of the slow-release polycarboxylic acid water reducer, and the aim of keeping the workability of the concrete is difficult to achieve. The expression is as follows: firstly, in a period of time with higher temperature in summer, the cement hydration speed is higher, the slow-release water reducing agent cannot be slowly and uniformly released but is released in advance, so that the concrete mixture can be isolated in a shorter time after the mixing is finished, and the workability of the concrete mixture cannot be kept for a long enough time due to the early release; secondly, under the condition of low temperature in winter, the cement hydration speed is low, the slow-release water reducing agent cannot play a role in the early stage, the slow-release water reducing agent can be released intensively in the later stage, and the concrete can also be isolated and secreted, and the condition is called as 'after-release' by technical personnel in concrete construction. To address this problem, the technicians in this industry have tried many methods to solve, the most important of which are: according to different seasons, the doping proportion of the slow-release water reducing agent is adjusted through experiments to relieve the influence of different seasons on the concrete quality, but the problem cannot be solved fundamentally, because in many places, particularly in northern areas, the temperature difference between day and night is large, the concrete with the same formula can be normally constructed in the day, segregation and bleeding are needed at night, and the concrete production is very difficult to control, so that great trouble is brought to technical personnel on a construction site. Therefore, to solve the problem of maintaining workability of concrete, the work cannot be done only by supplementing the amount of the polycarboxylic acid water reducing agent, and the limitation of the polycarboxylic acid water reducing agent cannot be perfectly solved.
Based on the analysis, the concrete performance loss is considered to be the root cause of the fluidity loss caused by cement hydration, and the retarding technology is utilized to properly reduce the initial hydration speed of the cement in the concrete so that the initial hydration speed can be more easily matched with the release speed of the slow-release polycarboxylic acid water reducing agent, and the concrete can be ensured to keep the performance unchanged within a certain time from the mixing of water. However, concrete retarders are various in types, some have long duration and some have short duration, some have obvious effects at high temperature, some have more prominent effects at low temperature, some have strong effects at early stage, and some have strong effects at late stage. How to reasonably use the retarders in a compounding way to form a new retarding technology and utilize the retarder to delay cement hydration and ensure that the hydration speed of the cement is matched with the release speed of the slow-release polycarboxylic acid water reducer, and the measures for solving the problems are insufficient.
Disclosure of Invention
Based on the above, the invention aims to provide a composite concrete admixture which has the advantages that the workability of concrete is kept for a time to meet construction requirements, the concrete is solidified in normal time, the workability is small in change amplitude in duration time and small in influence of temperature change, and the cost is lower compared with that of a conventional water reducing agent.
In order to achieve the purpose, the invention adopts the following technical scheme:
a composite concrete admixture comprises the following components in parts by weight: 5-8 parts of a polycarboxylic acid water reducing agent, 6-14 parts of a slow-release polycarboxylic acid water reducing agent, 3-4.5 parts of a saccharide retarder, 0-0.5 part of an organic acid retarder and 0.5-1 part of an inorganic acid retarder.
The retarder comprises a saccharide retarder, an organic acid retarder and an inorganic acid retarder, and has the functions of inhibiting cement hydration in the early stage, slowing down the hydration speed of cement, reducing the consumption speed of water in concrete, reducing the using amount of a slow-release water reducing agent and enabling the release speed of the slow-release water reducing agent to be matched with the hydration speed of the cement. They are also characterized by different effects of each retarder, such as long duration of retarding of the carbohydrate retarder, but slow rate of inhibiting concrete cement hydration, and short duration of organic and inorganic acid retarders. The aim of the composite use is to enable the retarder to inhibit the cement hydration to be uniform and continue, the water consumption speed of the cement is matched with the decomposition speed of the slow-release type polycarboxylate water reducing agent, and therefore the workability of the concrete can be uniformly and stably maintained.
Preferably, the saccharide retarder comprises the following components in parts by weight: 1-4 parts of sodium gluconate and 0.5-2 parts of cane sugar. The retarding time of the sodium gluconate is long, but the cement hydration inhibition speed is slow, and the sodium gluconate interacts with the polycarboxylate water reducer, so that the release speed of the slow-release water reducer is affected differently.
Preferably, the organic acid retarder is at least one of sodium citrate and tartaric acid.
Preferably, the inorganic acid retarder comprises the following components in parts by weight: 0.5-2 parts of sodium hexametaphosphate, 0-1 part of boric acid and 0-1.5 parts of sodium dihydrogen phosphate. Sodium hexametaphosphate can quickly inhibit cement hydration when contacting cement paste, but the duration is not long, boric acid is between the two, and the action effect of the organic acid and the boric acid is similar.
Preferably, the polycarboxylate water reducer is prepared by taking acrylic acid or methacrylic acid as a main chain and grafting polyether with different side chain lengths to synthesize polycarboxylic acid, and the polycarboxylic acid water reducer can be prepared by different manufacturers.
Preferably, the slow-release polycarboxylate water reducer is synthesized by taking methyl allyl polyoxyethylene ether (TPEG) and Acrylic Acid (AA) as main raw materials, can decompose a common polycarboxylate water reducer under an alkaline condition, and can be prepared by different manufacturers.
The invention also provides a preparation method of the composite concrete admixture, which comprises the following steps:
(1) mixing a polycarboxylate superplasticizer and a slow-release polycarboxylate superplasticizer according to a weight ratio, and uniformly stirring;
(2) adding water to dilute the mixed solution prepared in the step (1) according to the proportion of 1: 5-1: 8;
(3) accurately weighing the saccharide retarder, the organic acid retarder and the inorganic acid retarder according to a weight ratio, adding the weighed saccharide retarder, the organic acid retarder and the inorganic acid retarder into the solution prepared in the step (2), uniformly stirring, and standing to obtain the solid-free retarder without solid particle precipitation;
the solution temperature does not exceed 35 ℃ in the preparation process of the steps (1), (2) and (3).
The invention also provides the application of the composite concrete admixture, which is specifically applied to adding the composite concrete admixture into concrete according to the proportion of 0.9-1.1 percent of the composite concrete admixture in concrete cementing materials (such as cement, fly ash, slag powder and the like) to prepare the concrete.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the composite concrete admixture, the workability retention time of concrete can be maintained at 2-5 hours through different combinations, and the problem of construction difficulty caused by workability loss of concrete is solved.
2. The composite concrete admixture ensures that the workability of the concrete is kept for enough time, simultaneously ensures that the fluidity of the concrete is kept stable in the time, keeps the slump constant within the range allowed by construction, and does not have the conditions of segregation, bleeding and the like.
3. The composite concrete admixture disclosed by the invention can stably maintain the workability of concrete, has small influence on the setting time of the concrete, and cannot influence the demolding of the concrete due to too long setting time.
4. According to the composite concrete admixture, the solid content of the polycarboxylic acid water reducing agent in the material is reduced by 3-5%, so that the cost of each ton of the admixture is saved by 300-600 yuan, and the composite concrete admixture has good economic benefit.
Detailed Description
Example 1:
weighing 6 parts of polycarboxylic acid water reducing agent and 8 parts of slow-release polycarboxylic acid water reducing agent according to a ratio, mixing and stirring uniformly, adding water for diluting according to a ratio of 1:5, then mixing and stirring uniformly 3 parts of sodium gluconate, 0.5 part of cane sugar and 0.5 part of sodium hexametaphosphate, wherein the solution temperature does not exceed 35 ℃ in the preparation process, finally forming the composite concrete admixture, and mixing the concrete with the water-cement ratio of 0.43 according to the mixing amount of 0.95 percent of the total amount of the cementing material.
The concrete properties obtained by mixing the composite concrete admixture of example 1 are shown in Table 1:
TABLE 1 test results of concrete mixed with the composite admixture of example 1
The concrete of example 1 maintained slump within a range of 180mm to 210mm and spread within a range of 380mm to 500mm within 2.5 hours from the mixer, did not change the air content greatly, and maintained workability within a range of easy construction work. The solid content of the common water reducing agent is 6 percent, the solid content of the slow-release type polycarboxylate water reducing agent is 8 percent, the workability of the concrete needs to be maintained for 2.5 hours for the non-composite admixture, the solid content of the common water reducing agent is 5 percent, the solid content of the slow-release type polycarboxylate water reducing agent is 14 percent, and the composite admixture in the embodiment saves the using amount of the water reducing agent by 5 percent.
Example 2:
weighing 6.5 parts of polycarboxylic acid water reducing agent and 8 parts of slow-release polycarboxylic acid water reducing agent according to a proportion, uniformly mixing and stirring, adding water for dilution according to a ratio of 1:6, then uniformly mixing and stirring 2 parts of sodium gluconate, 1.5 parts of cane sugar, 0.5 part of sodium hexametaphosphate and 0.5 part of sodium citrate, wherein the solution temperature is not more than 35 ℃ in the preparation process, finally forming a composite concrete additive, and mixing the concrete additive by using a water-to-cement ratio of 0.43 according to the mixing amount of 0.9 percent of the total amount of the cementing material.
The concrete properties obtained by mixing the composite concrete admixture of example 2 are shown in Table 2:
TABLE 2 test results of concrete mixed with the composite admixture of example 2
The concrete in the embodiment 2 has the slump constant of 180-220 mm within 2.5 hours after the mixing machine, the expansion degree of 410-520 mm, the gas content of 3-4% and the workability of 2.5 hours without large fluctuation, and meets the requirements of normal construction operation and uniform and compact forming. The solid content of the common water reducing agent is 6.5 percent, the solid content of the slow-release type polycarboxylate water reducing agent is 8 percent, while the concrete workability of the common polycarboxylate water reducing agent is kept for 2.5 hours, the solid content of the common water reducing agent is 5 percent, the solid content of the slow-release type polycarboxylate water reducing agent is 14 percent, and the compound type admixture in the embodiment saves the water reducing agent consumption by 4.5 percent.
Example 3:
weighing 5.5 parts of polycarboxylic acid water reducing agent and 13.3 parts of slow-release polycarboxylic acid water reducing agent according to a ratio, uniformly mixing and stirring, diluting with water according to a ratio of 1:7, then uniformly mixing and stirring 2.5 parts of sodium gluconate, 1 part of cane sugar, 0.5 part of sodium dihydrogen phosphate and 0.5 part of tartaric acid, wherein the solution temperature is not more than 35 ℃ in the preparation process, finally forming a composite concrete additive, and mixing and stirring to prepare the concrete by using a water-cement ratio of 0.43 according to the mixing amount of 1.0 percent of the total amount of the cementing material.
The concrete properties obtained by mixing the composite concrete admixture of example 3 are shown in Table 3:
table 3 test results of concrete mixed with the composite admixture of example 3
The concrete in the embodiment 3 has the slump constant of 180-220 mm within 4.5 hours after the concrete is mixed with the machine, the expansion degree of 400-530 mm, the gas content of 3-4% and the workability of 4.5 hours without large fluctuation, and meets the requirements of normal construction operation and uniform and compact forming. The solid content of the common water reducing agent is 5.5%, the solid content of the slow-release type polycarboxylate water reducing agent is 13.3%, while for the common polycarboxylate water reducing agent, the concrete workability is kept for 4.5 hours, the solid content of the common water reducing agent is 4%, the solid content of the slow-release type polycarboxylate water reducing agent is 19%, and the compound type admixture in the embodiment saves the water reducing agent consumption by 4.2%.
Example 4:
weighing 6.5 parts of polycarboxylic acid water reducing agent and 7 parts of slow-release polycarboxylic acid water reducing agent according to a ratio, uniformly stirring after mixing, adding water for diluting according to a ratio of 1:8, then uniformly mixing and stirring 3 parts of sodium gluconate, 1 part of cane sugar, 0.5 part of sodium hexametaphosphate and 0.5 part of sodium citrate, wherein the solution temperature does not exceed 35 ℃ in the preparation process, finally forming a composite concrete additive, and mixing the concrete with the water-cement ratio of 0.43 according to the mixing amount of 1.1 percent of the total amount of the cementing material.
The concrete properties obtained by mixing the composite concrete admixture of example 4 are shown in Table 4:
table 4 test results of concrete mixed with the composite admixture of example 4
The concrete in the embodiment 4 has the slump constant of 160-210 mm within 2.5 hours after the concrete mixing machine, the expansion degree of 360-480 mm, the gas content of 3-4% and the workability of 2.5 hours without large fluctuation, and meets the requirements of normal construction operation and uniform and compact forming. For a common polycarboxylic acid water reducing agent, the concrete workability is kept for 2.5 hours, the solid content of the common water reducing agent is 5 percent, the solid content of the slow-release polycarboxylic acid water reducing agent is 14 percent, and the compound admixture in the embodiment saves the using amount of the water reducing agent by 5.5 percent.
Example 5:
weighing 6 parts of polycarboxylic acid water reducing agent and 8.5 parts of slow-release polycarboxylic acid water reducing agent according to a ratio, uniformly mixing and stirring, diluting with water according to a ratio of 1:8, then uniformly mixing and stirring 4 parts of sodium gluconate, 0.5 part of cane sugar, 0.8 part of boric acid and 0.5 part of sodium citrate, wherein the solution temperature is not more than 35 ℃ in the preparation process, finally forming a composite concrete additive, and mixing the concrete with the water-cement ratio of 0.43 according to the mixing amount of 1.0 percent of the total amount of the cementing material.
The concrete properties obtained by mixing the composite concrete admixture of example 5 are shown in Table 5:
TABLE 5 test results of concrete mixed with the composite admixture of example 5
In the concrete of example 5, the slump is maintained within the range of 180mm to 210mm within 2.5 hours after the concrete is mixed out of the machine, the expansion degree is maintained within the range of 440mm to 510mm, the gas content is 3% to 4%, the workability is maintained within 2.5 hours without large fluctuation, and the concrete meets the requirements of normal construction operation and uniform and compact forming. For a common polycarboxylic acid water reducing agent, the concrete workability is kept for 2.5 hours, the solid content of the common water reducing agent is 5 percent, the solid content of the slow-release polycarboxylic acid water reducing agent is 14 percent, and the compound admixture in the embodiment saves the using amount of the water reducing agent by 4.5 percent.
Example 6:
weighing 8 parts of a common polycarboxylic acid water reducing agent and 6 parts of a slow-release polycarboxylic acid water reducing agent according to a ratio, uniformly stirring after mixing, adding water for diluting according to a ratio of 1:8, then uniformly mixing and stirring 1 part of sodium gluconate, 2 parts of cane sugar, 1 part of sodium hexametaphosphate and 0.5 part of sodium citrate, wherein the solution temperature does not exceed 35 ℃ in the preparation process, finally forming a composite concrete additive, and mixing the concrete additive with the water-cement ratio of 0.43 according to the mixing amount of 1.0 percent of the total amount of the cementing material.
The concrete properties obtained by mixing the composite concrete admixture of example 6 are shown in Table 5:
TABLE 6 test results of concrete mixed with the composite admixture of example 6
The concrete in example 6 had slump constant within the range of 180mm to 220mm, expansion constant within the range of 420mm to 540mm, gas content within the range of 3% to 4% within 2.5 hours after the concrete mixing machine, and workability within 2.5 hours without large fluctuation, and met the requirements of normal construction operation and uniform and compact molding. For a common polycarboxylate superplasticizer, the workability of concrete needs to be maintained for 2.5 hours, the solid content of the common superplasticizer is 5%, the solid content of the slow-release polycarboxylate superplasticizer is 14%, and the compound admixture in the embodiment saves the dosage of the water reducer by 5%.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (7)
1. The composite concrete admixture is characterized by comprising the following components in parts by weight: 5-8 parts of a polycarboxylic acid water reducing agent, 6-14 parts of a slow-release polycarboxylic acid water reducing agent, 3-4.5 parts of a saccharide retarder, 0-0.5 part of an organic acid retarder and 0.5-1 part of an inorganic acid retarder; the saccharide retarder comprises the following components in parts by weight: 1-4 parts of sodium gluconate and 0.5-2 parts of cane sugar.
2. The compound concrete admixture according to claim 1, wherein the organic acid retarder is at least one of sodium citrate and tartaric acid.
3. The compound concrete admixture according to claim 1, wherein the inorganic acid type retarder comprises the following components in parts by weight: 0.5-2 parts of sodium hexametaphosphate, 0-1 part of boric acid and 0-1.5 parts of sodium dihydrogen phosphate.
4. The compound concrete admixture according to claim 1, wherein the polycarboxylic acid water reducing agent is synthesized by grafting polyethers with different side chain lengths with acrylic acid or methacrylic acid as a main chain.
5. The compound concrete admixture according to claim 1, wherein the slow-release type polycarboxylate superplasticizer is synthesized from methallyl polyoxyethylene ether and acrylic acid.
6. The preparation method of the compound concrete admixture according to any one of claims 1 to 5, characterized by comprising the following steps:
(1) mixing a polycarboxylate superplasticizer and a slow-release polycarboxylate superplasticizer according to a weight ratio, and uniformly stirring;
(2) adding water to dilute the mixed solution prepared in the step (1) according to the proportion of 1: 5-1: 8;
(3) accurately weighing the saccharide retarder, the organic acid retarder and the inorganic acid retarder according to a weight ratio, adding the weighed saccharide retarder, the organic acid retarder and the inorganic acid retarder into the solution prepared in the step (2), uniformly stirring, and standing to obtain the solid-free retarder without solid particle precipitation;
the solution temperature does not exceed 35 ℃ in the preparation process of the steps (1), (2) and (3).
7. The application of the composite concrete admixture according to any one of claims 1 to 5 in meeting concrete workability is characterized in that the composite admixture is added into concrete according to the mass ratio of 0.9-1.1% to prepare the concrete.
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| CN113636773A (en) * | 2021-06-01 | 2021-11-12 | 贵州石博士科技股份有限公司 | Composite concrete retarder and preparation method thereof |
| CN115093157A (en) * | 2022-06-10 | 2022-09-23 | 山东冠晔新材料科技有限公司 | Concrete retarder and preparation method thereof |
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| CN102731014A (en) * | 2012-06-29 | 2012-10-17 | 上海市建筑构件制品有限公司 | Polycarboxylic acid-lignin composite additive |
| CN103539382A (en) * | 2012-07-12 | 2014-01-29 | 宁波市中达利建材科技有限公司 | Polycarboxylate superplasticizer |
| CN107117854A (en) * | 2017-04-21 | 2017-09-01 | 戴琪 | A kind of preparation method of concrete pump-feed agent |
| CN108129110A (en) * | 2017-12-27 | 2018-06-08 | 中铁五局集团第四工程有限责任公司 | A kind of high-speed railway large cross-section tunnel prestressed cable anchorage paste materials |
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