CN110698109A - Special high-workability bleeding-resistant additive for nanoscale concrete - Google Patents
Special high-workability bleeding-resistant additive for nanoscale concrete Download PDFInfo
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- CN110698109A CN110698109A CN201910903034.4A CN201910903034A CN110698109A CN 110698109 A CN110698109 A CN 110698109A CN 201910903034 A CN201910903034 A CN 201910903034A CN 110698109 A CN110698109 A CN 110698109A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a high-workability bleeding-resistant special additive for nanoscale concrete, which comprises the following components in percentage by weight: 5-10% of a polycarboxylic acid water reducing agent, 10-15% of a polycarboxylic acid slump retaining agent, 8-12% of nanocellulose, 1-3% of a bleeding regulator, 5-10% of lignin, 0.05-0.1% of an air entraining agent, 0.01-0.03% of a defoaming agent, 0.5-1% of a retarder and the balance of water, wherein the nanocellulose is water-based nanocellulose and is prepared by processing wood fibers, the fiber particle size range is 20-80nm, the nanocellulose is diluted to the solid content of 1-2% under the condition of high-speed stirring, the diluting method is that the nanocellulose is stirred in a stirrer with the rotating speed of more than 2000rpm for more than 20min to form a 3D net structure, the bleeding regulator is a cellulose ether bleeding inhibitor, and the lignin is sodium. The invention is suitable for the problem of bleeding of low-slump concrete, can solve the problem of easy segregation and bottom grabbing of high-grade self-compacting concrete, and can greatly improve the construction property and stability of the concrete.
Description
Technical Field
The invention belongs to the technical field of concrete admixtures, and particularly relates to a special high-workability bleeding-resistant nanoscale concrete admixture.
Background
With the rapid progress of the urbanization of the country in recent years, the amount of concrete used as the most commonly used building material is rapidly increased, but the problems therewith are gradually increased. The most prominent problem is the problem of performance fluctuation caused by the tension of resource type materials, such as cement, sand and stone. As two raw materials with the largest consumption of concrete, the performance fluctuation directly influences the mixture performance and later hardening performance of the concrete. As the national advocates the strategy of environmental protection and sustainable development vigorously in recent years, the original natural resources with higher quality are limited, and the cement production is a disposal point of industrial waste products and renewable resources, which causes the generation of abnormal performance of cement in concrete, more commonly the problems of cement loss and bleeding over time, especially the problem of delayed bleeding of concrete, the reason composition is more complex, the problem of raw materials exists, and the problem of concrete mixing ratio also exists.
At the present stage, the amount of sand used as fine aggregate is also increased, and natural river sand is used as a consumable natural resource. The annual exploitation quantity is increased year by year, but with the control of national policy on resources in recent years, the sandstone resource is gradually exhausted, the quality of natural river sand is also in a decline trend along with the shortage of resources, and the exploitation of natural sandstone is forbidden in some regions. Therefore, under the gradually expanding engineering construction requirements, machine-made sand and a plurality of sand resources with poor particle grading are used in engineering, and a plurality of concrete problems are brought along with the machine-made sand, and the outstanding reason is that the sand has no natural river sand structure, has poor particle type, more needle-shaped particles and uneven particle distribution, so that the sand has poor water retention capacity, large void ratio and poor workability of mixed concrete. The water retention is insufficient, and the concrete bleeding problem can be caused to a great extent.
Under the background that the resources of cement and sand and stone are extremely short, a special admixture capable of effectively improving the problems of concrete is urgently needed, bleeding of the concrete caused by the grading problem of cement and sand and stone particles can be solved to a certain extent, the high fluidity and the maintenance of the workability of the concrete are ensured, and the contradiction between the high workability and the segregation resistance of the concrete is effectively relieved.
Disclosure of Invention
The invention provides a nano-grade concrete high-workability bleeding-resistant special additive, which is used for solving the concrete workability problem caused by less cementing materials of low-grade concrete, comprises a series of bleeding caused by cement and sand material particle grading problems, is suitable for the concrete bleeding problem with low slump, can solve the problem of easy segregation and bottom grabbing of high-grade self-compacting concrete, and greatly improves the concrete construction performance and stability. In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a high-workability bleeding-resistant special additive for nano-scale concrete, which comprises the following components in percentage by weight: 5 to 10 percent of polycarboxylic acid water reducing agent, 10 to 15 percent of polycarboxylic acid slump retaining agent, 8 to 12 percent of nano-cellulose, 1 to 3 percent of water secretion regulator, 5 to 10 percent of lignin, 0.05 to 0.1 percent of air entraining agent, 0.01 to 0.03 percent of defoaming agent, 0.5 to 1 percent of retarder and the balance of water,
the nano-cellulose is water-based nano-cellulose and is processed by wood fibers, the particle size range of the fibers is 20-80nm, the fibers are diluted to have the solid content of 1-2% under the condition of high-speed stirring, the dilution method is that the fibers are stirred in a stirrer with the rotating speed of more than 2000rpm for more than 20min to form white nano-cellulose suspension, and the white nano-cellulose suspension has a 3D net structure and effectively inhibits the precipitation of free water. The bleeding regulator is a cellulose ether bleeding inhibitor, can increase the viscosity and stability of a system, and can solve the problem of high sensitivity of a polycarboxylate water reducer in concrete production. The lignin is sodium lignosulphonate, can be used for auxiliary retarding and air entraining, and has a positive effect on the workability of concrete.
In the nano-scale concrete high-workability bleeding-resistant special additive, the polycarboxylic acid water reducing agent is an ester polycarboxylic acid water reducing agent, the solid content of the polycarboxylic acid water reducing agent is 40-50%, the pH value of the polycarboxylic acid water reducing agent is 6-7, and the net slurry fluidity is more than 200mm under the specified mixing amount.
In the nano-scale concrete high-workability bleeding-resistant special additive, the polycarboxylic acid slump retaining agent is a polyether polycarboxylic acid slump retaining agent produced by six-carbon polyether, and the workability of concrete can be effectively improved.
In the high-workability bleeding-resistant special additive for the nano-scale concrete, the air-entraining agent is an ether air-entraining agent.
In the nano-scale concrete high-workability bleeding-resistant special additive, the defoaming agent is an organic silicon defoaming agent, an ether defoaming agent or an ester defoaming agent.
In the high workability bleeding-resistant special admixture for the nano-scale concrete, the retarder is sodium citrate.
The concrete prepared by the special additive can achieve the following technical indexes: the water reducing rate of the concrete is more than 14%, the mixed concrete has the concrete work retentivity and high fluidity, the 2h expansion loss is less than 20%, and the 2h lag bleeding filter is less than 1%.
The invention adopts an additive mode, is more economical and effective, adopts the unique carrier of the nano-cellulose, utilizes the huge specific surface area to increase the water locking capacity of the whole concrete system, fundamentally improves the bleeding problem of the concrete, effectively controls the separation of free water in the concrete system under the combined action of the nano-cellulose and a bleeding inhibitor and an air entraining agent in the system, has higher economic benefit and operability and has better practical advancement compared with the traditional method of increasing a cementing material through the concrete mixing ratio and increasing fine materials in the mixing ratio. The nano-cellulose can be used as a tensile material in a concrete system, is favorable for improving the tensile resistance of concrete and is favorable for controlling the initial cracks of the concrete.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention has the double functions of water reduction and slump loss prevention, has better concrete workability adjusting function on the basis, adopts ester and six-carbon polyether mother liquor, reduces the production sensitivity problem of the polycarboxylic acid system admixture, is beneficial to the control of the production process of concrete production enterprises, has good slump loss prevention function, and has the concrete workability loss less than 20 percent within 2 hours.
2. The invention has unique bleeding inhibition function, can effectively solve the problems of early and delayed bleeding of concrete caused by cement and aggregate, and has the bleeding rate controlled below 1 percent.
3. The invention can reduce the yield shear stress of the high-grade concrete, reduce the integral viscosity of the concrete and avoid the problem of bottom grabbing caused by the segregation of the high-grade concrete.
Detailed Description
The technical solutions in the embodiments of the present invention are 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 obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment provides a high-workability bleeding-resistant special additive for nanoscale concrete, which comprises the following components in percentage by weight: 5-10% of polycarboxylic acid water reducing agent, 10-15% of polycarboxylic acid slump retaining agent, 8-12% of nano-cellulose, 1-3% of water secretion regulator, 5-10% of lignin, 0.05-0.1% of air entraining agent, 0.01-0.03% of defoaming agent, 0.5-1% of retarder and the balance of water.
In the nano-scale concrete high-workability bleeding-resistant special additive, the polycarboxylic acid water reducing agent is an ester polycarboxylic acid water reducing agent, the solid content of the polycarboxylic acid water reducing agent is 40-50%, the pH value of the polycarboxylic acid water reducing agent is 6-7, and the net slurry fluidity is more than 200mm under the specified mixing amount. The VIVID-910 product produced by Sanrui chemical industry can be selected. In the nano-scale concrete high-workability bleeding-resistant special additive, the polycarboxylic acid slump retaining agent is a polyether polycarboxylic acid slump retaining agent produced by six-carbon polyether, and the workability of concrete can be effectively improved. The TJ388 type product produced by Taiwan chemical company can be selected. In the high-workability bleeding-resistant special additive for the nano-scale concrete, the nano-cellulose is water-based nano-cellulose and is processed by wood fibers, the particle size range of the fibers is 20-80nm, the nano-cellulose is diluted to the solid content of 1-2% under the condition of high-speed stirring, and the dilution method is that the nano-cellulose is stirred in a stirrer with the rotating speed of more than 2000rpm for more than 20min to form a 3D network structure, so that the precipitation of free water is effectively inhibited. Nanocellulose-based products from caldick may be used. In the nano-scale concrete high-workability bleeding-resistant special additive, the bleeding regulator is a cellulose ether bleeding inhibitor, can increase the viscosity and stability of a system, and can solve the problem of high sensitivity of a polycarboxylic acid water reducing agent in concrete production. LS800 product produced by Shanghai Yinosha building materials company can be selected. In the nano-scale concrete high-workability bleeding-resistant special additive, the lignin is sodium lignosulphonate, can be used for auxiliary retarding and air entraining, and has a positive effect on the workability of concrete. In the high-workability bleeding-resistant special additive for the nano-scale concrete, the air-entraining agent is an ether air-entraining agent. GYQ-IV type products produced by Jiangsu Bote New Material company can be selected. In the nano-scale concrete high-workability bleeding-resistant special additive, the defoaming agent is an organic silicon defoaming agent, an ether defoaming agent or an ester defoaming agent. SBT-PXP (III) defoamer products produced by Jiangsu Bote New Material company can be selected. In the high workability bleeding-resistant special admixture for the nano-scale concrete, the retarder is sodium citrate.
Example 1
Taking the corresponding raw materials introduced in the invention for compounding, adding the solid components in a liquid pre-dissolving mode, and carrying out the preparation method
The concrete composition proportion is as follows (the proportion is calculated by mass percent):
the admixture produced by adopting the formula is used for preparing C30 graded concrete, the bleeding condition of the conventional admixture adopted by the concrete exists, mainly caused by discontinuous grading of sand fine aggregate and severe bleeding of cement, and the cement adaptability and sand detection data are as follows:
when the cement (P ∙ O42.5) in the concrete is detected by adopting the pure slurry, the situation of bleeding after half an hour exists, and the bleeding amount is about 3 percent of the water consumption of the pure slurry. The concrete produced by adopting the cement has serious bleeding.
The neat paste data are as follows:
the cement has the problems of larger net grout compared with normal cement, and has certain bleeding, so that the concrete can be seriously lagged and bled in the concrete.
The aggregate particle grading of the sand stone material adopted by the concrete is poor, the single particle size is more, and the particle distribution data of the sand stone material is as follows:
the calculated result of the fineness modulus is 2.4 according to JGJ52-2006 Standard test method for quality of common concrete Sand and Stone, and the percentage of the points is mostly 0.63 and 0.315. The rest is less, and the sand particles are distributed more singly. Is discontinuous. The porosity of the sand is easily too large and not compact. The prepared concrete has poor workability and insufficient water retention property, and is easy to cause later bleeding of the concrete.
The concrete in the embodiment has the following mixing ratio:
| water (W) | Cement PO42.5 | Class II fly ash | S95 powdered ore | Sandstone material (fineness 2.4) | Crushed stone of 5-25mm | Additive agent |
| 170 | 210 | 70 | 80 | 846 | 1034 | 4.7 |
The data using the conventional admixture and the nano-modified admixture are compared as follows:
| serial number | Variety of additive | Slump mm/slump mm in the initial state | 0.5h slump mm/extension mm | Slump of 1h mm/slump of mm |
| 1 | Conventional polycarboxylic acid water reducing agent | 230/480 (No bleeding) | 235/440 (surface bleeding) | 180/360 (severe bleeding, severe concrete bottom grout run, poor workability) |
| 2 | Nano-scale special additive | 230/510 (No bleeding) | 225/480 (No bleeding) | 220/470 (No bleeding) |
Through the comparison of the two groups of data, the hysteresis bleeding of concrete is easily caused under the condition that cement and gravels have problems, which is mainly caused by the problems that the grains of the gravels are not well distributed, the water retention is poor, the grains of the cement are not well distributed, the cement mixture is not good, and the like. Generally, two ideas are mainly adopted for solving the problems. One is to start with the mix ratio, increase the amount of gelling and change the particle distribution of the sand, but this approach is limited by cost and material realities. And secondly, a thickening additive is added, so that the viscosity of the cement paste can be increased, the bleeding speed can be relieved to a certain extent, but the bleeding cannot be fundamentally solved, and the bleeding condition to a certain extent still occurs due to the problems of concrete vibration and the like in final construction.
By adopting the nano-scale special additive, the water retention capacity of the whole system is physically increased due to the introduction of the nano-scale cellulose fiber, and the dispersed 3D structure can seal rising pores of water in concrete to a certain extent, so that the generation of bleeding is fundamentally avoided, and the nano-scale special additive is a brand new concept. In the using process, the additive is added in the form of an additive, so that the production and the use of the ready-mixed concrete are more convenient, the required cost is lower, and the additive also has the advantages of the conventional means in the aspects of practical application and economy.
Although the present invention has been described in detail with respect to the above embodiments, it will be understood by those skilled in the art that modifications or improvements based on the disclosure of the present invention may be made without departing from the spirit and scope of the invention, and these modifications and improvements are within the spirit and scope of the invention.
Claims (6)
1. The high-workability bleeding-resistant special additive for the nano-scale concrete is characterized by comprising the following components in percentage by weight: 5 to 10 percent of polycarboxylic acid water reducing agent, 10 to 15 percent of polycarboxylic acid slump retaining agent, 8 to 12 percent of nano-cellulose, 1 to 3 percent of water secretion regulator, 5 to 10 percent of lignin, 0.05 to 0.1 percent of air entraining agent, 0.01 to 0.03 percent of defoaming agent, 0.5 to 1 percent of retarder and the balance of water,
the nano-cellulose is water-based nano-cellulose and is processed by wood fibers, the particle size range of the fibers is 20-80nm, the fibers are diluted to the solid content of 1-2% under the condition of high-speed stirring, the dilution method is that the fibers are stirred in a stirrer with the rotating speed of more than 2000rpm for more than 20min to form a 3D network structure, the water secretion regulator is a cellulose ether water secretion inhibitor, and the lignin is sodium lignosulfonate.
2. The admixture special for high workability and bleeding resistance of nanoscale concrete as claimed in claim 1, wherein said polycarboxylic acid water reducer is an ester polycarboxylic acid water reducer, the solid content of which is 40% -50%, the pH value is 6-7, and the net slurry fluidity is more than 200mm at a specified mixing amount.
3. The admixture special for high workability and bleeding resistance of nanoscale concrete as claimed in claim 1, wherein the polycarboxylic slump retaining agent is a polyether polycarboxylic slump retaining agent produced from six-carbon polyether.
4. The admixture special for high workability and bleeding water resistance of nano-scale concrete according to claim 1, wherein the air-entraining agent is an ether-type air-entraining agent.
5. The admixture special for high workability and bleeding water resistance of nano-scale concrete according to claim 1, wherein the defoaming agent is an organosilicon, ether or ester defoaming agent.
6. The high workability bleeding water resistant admixture for nano-scale concrete according to claim 1, wherein said retarder is sodium citrate.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111978005A (en) * | 2020-08-24 | 2020-11-24 | 陕西瑞星建材科技有限公司 | Composite water reducing agent and preparation method and application thereof |
| CN113480220A (en) * | 2021-08-11 | 2021-10-08 | 海南丰业实业有限公司 | Fabricated building material concrete composite additive and concrete thereof |
| CN114195451A (en) * | 2021-12-09 | 2022-03-18 | 北京科技大学 | Preparation method of nano-cellulose reinforced filling slurry |
| CN114230247A (en) * | 2021-12-21 | 2022-03-25 | 中建五局土木工程有限公司 | High-performance nanofiber machine-made sand concrete and preparation method thereof |
| CN114804709A (en) * | 2022-05-23 | 2022-07-29 | 广西科达建材化工有限公司 | Novel early strength agent of nano calcium silicate hydrate polycarboxylic acid and preparation method thereof |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4204877A (en) * | 1979-01-15 | 1980-05-27 | Westvaco Corporation | Cement grinding aid and set retarder |
| CN102491677A (en) * | 2011-11-22 | 2012-06-13 | 浙江五龙新材股份有限公司 | Nuclear power concrete additive and preparation method thereof |
| CN102548928A (en) * | 2009-10-02 | 2012-07-04 | 芬欧汇川集团 | Material to be used as a concrete additive |
| CN105601155A (en) * | 2015-12-29 | 2016-05-25 | 中建商品混凝土有限公司 | Additive special for limestone powder concrete |
| CN106045543A (en) * | 2016-08-01 | 2016-10-26 | 万燕杰 | High-strength and wear-resisting castable |
| CN106186795A (en) * | 2016-07-08 | 2016-12-07 | 江苏苏博特新材料股份有限公司 | A kind of pervious concrete special additive and application thereof |
| CN106587711A (en) * | 2016-12-16 | 2017-04-26 | 上海建工材料工程有限公司 | Special additive for self-compacting concretes for concrete pouring in closed space |
| CN106832154A (en) * | 2016-12-23 | 2017-06-13 | 中建商品混凝土有限公司 | A kind of thickening type function polycarboxylate water-reducer and preparation method thereof |
| CN107500678A (en) * | 2017-09-30 | 2017-12-22 | 广西路桥工程集团有限公司 | A kind of self-compacting concrete |
| CN107601977A (en) * | 2017-08-31 | 2018-01-19 | 武汉理工大学 | A kind of Cellulose nanocrystal enhancing cement paste material and preparation method thereof |
| CN108249847A (en) * | 2017-12-25 | 2018-07-06 | 芜湖林电子科技有限公司 | A kind of 3D printing mortar of high compressive strength |
| CN108911567A (en) * | 2018-07-24 | 2018-11-30 | 成都建工预筑科技有限公司 | High-strength concrete special additive and preparation method thereof |
| CN108911573A (en) * | 2018-07-24 | 2018-11-30 | 成都建工预筑科技有限公司 | Steel fiber reinforced concrete special additive |
-
2019
- 2019-09-24 CN CN201910903034.4A patent/CN110698109A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4204877A (en) * | 1979-01-15 | 1980-05-27 | Westvaco Corporation | Cement grinding aid and set retarder |
| CN102548928A (en) * | 2009-10-02 | 2012-07-04 | 芬欧汇川集团 | Material to be used as a concrete additive |
| CN102491677A (en) * | 2011-11-22 | 2012-06-13 | 浙江五龙新材股份有限公司 | Nuclear power concrete additive and preparation method thereof |
| CN105601155A (en) * | 2015-12-29 | 2016-05-25 | 中建商品混凝土有限公司 | Additive special for limestone powder concrete |
| CN106186795A (en) * | 2016-07-08 | 2016-12-07 | 江苏苏博特新材料股份有限公司 | A kind of pervious concrete special additive and application thereof |
| CN106045543A (en) * | 2016-08-01 | 2016-10-26 | 万燕杰 | High-strength and wear-resisting castable |
| CN106587711A (en) * | 2016-12-16 | 2017-04-26 | 上海建工材料工程有限公司 | Special additive for self-compacting concretes for concrete pouring in closed space |
| CN106832154A (en) * | 2016-12-23 | 2017-06-13 | 中建商品混凝土有限公司 | A kind of thickening type function polycarboxylate water-reducer and preparation method thereof |
| CN107601977A (en) * | 2017-08-31 | 2018-01-19 | 武汉理工大学 | A kind of Cellulose nanocrystal enhancing cement paste material and preparation method thereof |
| CN107500678A (en) * | 2017-09-30 | 2017-12-22 | 广西路桥工程集团有限公司 | A kind of self-compacting concrete |
| CN108249847A (en) * | 2017-12-25 | 2018-07-06 | 芜湖林电子科技有限公司 | A kind of 3D printing mortar of high compressive strength |
| CN108911567A (en) * | 2018-07-24 | 2018-11-30 | 成都建工预筑科技有限公司 | High-strength concrete special additive and preparation method thereof |
| CN108911573A (en) * | 2018-07-24 | 2018-11-30 | 成都建工预筑科技有限公司 | Steel fiber reinforced concrete special additive |
Non-Patent Citations (1)
| Title |
|---|
| 混凝土外加剂及其应用技术论坛: "《聚羧酸系高性能减水剂及其应用技术新进展》", 31 March 2019, 北京理工大学出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111978005A (en) * | 2020-08-24 | 2020-11-24 | 陕西瑞星建材科技有限公司 | Composite water reducing agent and preparation method and application thereof |
| CN113480220A (en) * | 2021-08-11 | 2021-10-08 | 海南丰业实业有限公司 | Fabricated building material concrete composite additive and concrete thereof |
| CN114195451A (en) * | 2021-12-09 | 2022-03-18 | 北京科技大学 | Preparation method of nano-cellulose reinforced filling slurry |
| CN114230247A (en) * | 2021-12-21 | 2022-03-25 | 中建五局土木工程有限公司 | High-performance nanofiber machine-made sand concrete and preparation method thereof |
| CN114804709A (en) * | 2022-05-23 | 2022-07-29 | 广西科达建材化工有限公司 | Novel early strength agent of nano calcium silicate hydrate polycarboxylic acid and preparation method thereof |
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Application publication date: 20200117 |