Efficient concrete water reducing agent

Abstract

The invention provides a high-efficiency concrete water reducing agent. The high-efficiency concrete water reducing agent is prepared from the following components: a sulfonic modified polycarboxylic acid water reducing agent, graphene oxide, modified nano silicon dioxide and rare earth oxide. Preferably, the content of each component is as follows in parts by mass: 32-56 parts of the sulfonic modified polycarboxylic acid water reducer, 8-16 parts of the graphene oxide, 2-7 parts of the nano silicon dioxide and 3-5 parts of the rare earth oxide. According to the efficient concrete water reducing agent provided by the invention, a graphene oxide / nano silicon dioxide composite material is prepared from graphene oxide and nano silicon dioxide, and then the graphene oxide / nano silicon dioxide composite material is mixed with a sulfonic modified polycarboxylic acid water reducing agent and a rare earth oxide, ground and stirred to prepare a finished product. The obtained finished product is used for concrete, and the concrete is good in workability, high in water-reducing rate, high in strength and good in bleeding performance.

Description

Technical Field

[0001] The present invention relates to the technical field of water reducing agents, and particularly to a high-efficiency concrete water reducing agent. Background Art

[0002] A water reducing agent is a concrete admixture that can reduce the mixing water consumption under the condition of maintaining the slump of concrete unchanged. Most of them belong to anionic surfactants, such as lignosulfonates, naphthalene sulfonate formaldehyde polymers, etc. After being added to the concrete mixture, they have a dispersing effect on cement particles, can improve its workability, reduce the unit water consumption, and improve the fluidity of the concrete mixture; or reduce the unit cement consumption and save cement.

[0003] With the development of society, the comprehensive requirements for high-performance concrete are getting higher and higher, and thus the performance requirements for concrete water reducing agents are also getting higher and higher. Existing various concrete water reducing agents have problems such as large slump loss, easy stickiness of concrete, large bleeding rate, and low efficiency to varying degrees. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-efficiency concrete water reducing agent to solve the problems in the prior art that various concrete water reducing agents have problems such as large slump loss, easy stickiness of concrete, large bleeding rate, and low efficiency to varying degrees.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A high-efficiency concrete water reducing agent, comprising the following components:

[0006] Sulfonic acid group modified polycarboxylate water reducing agent, graphene oxide, modified nano-silica, rare earth oxide.

[0007] Preferably, by mass fraction, the contents of each component are as follows:

[0008] 32-56 parts of sulfonic acid group modified polycarboxylate water reducing agent, 8-16 parts of graphene oxide, 2-7 parts of nano-silica, 3-5 parts of rare earth oxide.

[0009] Preferably, the molar ratio of sulfonic acid group to polycarboxylic acid in the sulfonic acid group modified polycarboxylate water reducing agent is 0.3-0.5.

[0010] Preferably, the modified nano-silica is prepared by reacting octadecanol with nano-silica under certain temperature and pressure.

[0011] Preferably, the rare earth oxide is one of La2O3, CeO2 or ZrO2.

[0012] Preferably, the preparation method of the high-efficiency concrete water reducing agent is as follows:

[0013] S1, prepare graphene oxide:

[0014] Graphite oxide was prepared by the Hummers method and then graphene oxide was obtained by ultrasonic dispersion.

[0015] S2. Preparation of modified nano-silica:

[0016] Octadecanol and nano-silica were mixed, sodium dodecylbenzenesulfonate was added, and the temperature was raised to 85 °C to prepare modified nano-silica.

[0017] S3. Graphene oxide and modified nano-silica were mixed to prepare a graphene oxide / nano-silica composite material:

[0018] Graphene oxide was ultrasonically dispersed in water for 10 - 30 min, then modified nano-silica was added and ultrasonically dispersed for another 3 - 5 h, and then left standing, filtered, and dried to obtain the graphene oxide / nano-silica composite material.

[0019] S4. Preparation of the finished water reducer:

[0020] The sulfonic acid group-modified polycarboxylate water reducer, the graphene oxide / nano-silica composite material, and rare earth oxides were mixed and ground and stirred to obtain the finished water reducer.

[0021] The present invention has at least the following beneficial effects:

[0022] A high-efficiency concrete water reducer provided by the present invention first prepares a graphene oxide / nano-silica composite material through graphene oxide and nano-silica, and then the graphene oxide / nano-silica composite material is mixed with the sulfonic acid group-modified polycarboxylate water reducer and rare earth oxides, and ground and stirred to obtain the finished product. When the obtained finished product is used in concrete, the workability of the concrete is good, the water reduction rate is high, the strength is high, and the bleeding performance is good. Detailed implementation manners

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Example 1

[0025] A high-efficiency concrete water reducer, in terms of mass parts, the components and contents are as follows:

[0026] 32 parts of sulfonic acid group-modified polycarboxylate water reducer, 8 parts of graphene oxide, 2 parts of nano-silica, and 3 parts of rare earth oxides.

[0027] Among them, the molar ratio of sulfonic acid group to polycarboxylic acid in the sulfonic acid group modified polycarboxylate superplasticizer is 0.3.

[0028] Among them, the rare earth oxide is La2O3.

[0029] Example 2

[0030] A high-efficiency concrete superplasticizer, in parts by mass, the components and their contents are as follows:

[0031] 40 parts of sulfonic acid group modified polycarboxylate superplasticizer, 10 parts of graphene oxide, 5 parts of nano-silica, and 4 parts of rare earth oxide.

[0032] Among them, the molar ratio of sulfonic acid group to polycarboxylic acid in the sulfonic acid group modified polycarboxylate superplasticizer is 0.4.

[0033] Among them, the rare earth oxide is CeO2.

[0034] Example 3

[0035] A high-efficiency concrete superplasticizer, in parts by mass, the components and their contents are as follows:

[0036] 56 parts of sulfonic acid group modified polycarboxylate superplasticizer, 16 parts of graphene oxide, 7 parts of nano-silica, and 5 parts of rare earth oxide.

[0037] Among them, the molar ratio of sulfonic acid group to polycarboxylic acid in the sulfonic acid group modified polycarboxylate superplasticizer is 0.5.

[0038] Among them, the rare earth oxide is ZrO2.

[0039] For the high-efficiency concrete superplasticizer provided in the above Examples 1-3, the preparation method is as follows:

[0040] S1. Prepare graphene oxide:

[0041] Prepare graphite oxide by the Hummers method, then add the graphite oxide into water, ultrasonically disperse for 30 min, and centrifuge to obtain graphene oxide;

[0042] S2. Prepare modified nano-silica:

[0043] Mix octadecanol and nano-silica, add sodium dodecylbenzenesulfonate, heat up to 85 °C, and react for 90 min to prepare modified nano-silica;

[0044] S3. Mix graphene oxide and modified nano-silica to prepare a graphene oxide / nano-silica composite material:

[0045] Ultrasonically disperse graphene oxide in water for 10 - 30 min, then add modified nano-silica and continue to ultrasonically disperse for 3 - 5 h, let it stand, filter by suction, and dry to obtain the graphene oxide / nano-silica composite material;

[0046] S4. Prepare the finished water reducing agent:

[0047] Mix the sulfonic acid group modified polycarboxylate water reducing agent, the graphene oxide / nano-silica composite material and rare earth oxide, grind and stir to obtain the finished water reducing agent.

[0048] Carry out relevant performance tests on the products prepared in the above Examples 1 - 3, and the results are as follows in the table:

[0049]

[0050] In summary, an efficient concrete water reducing agent provided by the present invention, when the obtained product is used in concrete, the workability of the concrete is good, the water reducing rate is high, the strength is high, and the bleeding performance is good.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

[0052] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency concrete water reducing agent, characterized in that: Includes the following ingredients: Sulfonic acid modified polycarboxylic acid water reducer, graphene oxide, modified nano-silica, rare earth oxides.

2. A high-efficiency concrete water reducing agent according to claim 1, characterized in that: The content of each component in parts by mass is as follows: 32-56 parts of sulfonic acid modified polycarboxylic acid water reducer, 8-16 parts of graphene oxide, 2-7 parts of nano silicon dioxide, and 3-5 parts of rare earth oxide.

3. A high-efficiency concrete water reducing agent according to claim 1, characterized in that: The molar ratio of sulfonic acid group to polycarboxylic acid in the sulfonic acid group-modified polycarboxylic acid water-reducing agent is 0.3 to 0.

5.

4. A high-efficiency concrete water reducing agent according to claim 1, characterized in that: The modified nano silicon dioxide is prepared by reacting octadecyl alcohol with nano silicon dioxide under a certain temperature and pressure.

5. A high-efficiency concrete water reducing agent according to claim 1, characterized in that: The rare earth oxide is one of La2O3, CeO2 or ZrO2.

6. A high-efficiency concrete water reducing agent according to claim 1, characterized in that: The preparation method of the high-efficiency concrete water reducing agent is as follows: S1, preparation of graphene oxide: Graphite oxide was prepared by Hummers method, and then graphene oxide was prepared by ultrasonic dispersion. S2, preparation of modified nano-silica: Mix octadecyl alcohol and nano-silica, add sodium dodecylbenzene sulfonate, and heat to 85°C to prepare modified nano-silica; S3, mixing graphene oxide and modified nano-silicon dioxide to prepare a graphene oxide / nano-silicon dioxide composite material: The graphene oxide is ultrasonically dispersed in water for 10 to 30 minutes, and then modified nano-silicon dioxide is added and ultrasonically dispersed for 3 to 5 hours, and the mixture is allowed to stand, filtered, and dried to obtain a graphene oxide / nano-silicon dioxide composite material. S4, preparing the finished water reducing agent: The sulfonic acid group-modified polycarboxylic acid water reducer, the graphene oxide / nano-silicon dioxide composite material and the rare earth oxide are mixed, ground and stirred to obtain a finished water reducer product.

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