CN108002740B - Plasticity crack-reducing material of cement-based material - Google Patents
Plasticity crack-reducing material of cement-based material Download PDFInfo
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- CN108002740B CN108002740B CN201711273697.XA CN201711273697A CN108002740B CN 108002740 B CN108002740 B CN 108002740B CN 201711273697 A CN201711273697 A CN 201711273697A CN 108002740 B CN108002740 B CN 108002740B
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
- C04B24/383—Cellulose or derivatives thereof
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a plastic crack-reducing material of a cement-based material, belonging to the technical field of material science and engineering. The water-absorbing resin composition is composed of 0-100% of super absorbent polymer, 0-100% of cellulose ether and 0-100% of polyether. The components are measured according to the mass percentage and are put into a mixing container to be stirred evenly, and the product of the invention is obtained. When in use, the mixing amount of the plastic crack reducing material is 0.01-0.1% of the mass of cement in the cement-based material. After the plastic crack reducing material is doped, the plastic shrinkage cracking performance of the cement-based material is greatly reduced, and when the mortar flat plate method is adopted for testing, the total weight value of the plastic shrinkage cracking can be reduced by 50-100% compared with that of the cement-based material without the plastic shrinkage cracking material; the workability, compressive strength, flexural strength and the like of the cement-based material are not affected and can even be improved; the impermeability, frost resistance and the like of the cement-based material can be improved to a certain degree. The plastic shrinkage cracking degree of the cement-based material engineering, such as cement concrete pavement, bridge deck, terrace, slope protection, dam, airport runway and other engineering, using the cement-based material engineering is reduced.
Description
Technical Field
The invention relates to a plastic crack-reducing material of a cement-based material. The plastic cracking-reducing material can be used for reducing the plastic shrinkage cracking degree of cement-based materials. Belongs to the technical field of material science and engineering.
Technical Field
Among a plurality of building materials, the cement-based material is the most widely applied one of civil engineering materials, has the widest application range and the largest dosage, and because the cement-based material has the advantages of low price, better durability, easy casting molding and unsubstitutability in civil engineering, the concrete still can be the main building material which can not be replaced by modern engineering construction in China in the twenty-first century. However, many buildings already put into use are cracked, so that various quality and safety problems begin to occur when the service life of the buildings in design is not reached, some highway bridges need to be repaired after being put into use for three or five years, and some highway bridges can only be repaired while being built even if not built, which is a huge loss for the economy of the country.
The factors influencing the cracking of concrete are many, the shrinkage of the concrete is one of the most common factors causing the cracking, the concrete shrinks to form the cracking, the shrinkage mainly comprises several main shrinkages such as plastic shrinkage, carbonization shrinkage, temperature shrinkage, drying shrinkage and self-shrinkage, the concrete shrinkage can cause tensile stress, the tensile capability of the concrete is not strong, and therefore the cracking is easily generated in the process, and the durability of the concrete is influenced. The shrinkage of cement concrete before setting is a plastic shrinkage. Generally, plastic shrinkage occurs within the first several hours after the formation of fresh concrete, and when moisture evaporates more rapidly at an early stage, the plastic shrinkage becomes more remarkable, and plastic shrinkage cracking is more likely to occur.
The plastic shrinkage cracks not only affect the beauty of products, but also reduce the strength of structural concrete, affect the service performance and the service life of the structure and bring inconvenience to the life and the production of people, so that the research on the plastic crack reducing material of the cement-based material is very necessary. At present, the measures for reducing the plastic shrinkage cracking mainly comprise the changes of raw materials and the mixture ratio, the addition of fiber materials, the addition of expanding agents, the enhancement of wet curing and the like.
Disclosure of Invention
The invention aims to disclose a material for reducing the plastic shrinkage cracking degree of a cement-based material. Compared with the existing doped fiber material, the doped expanding agent and the like, the material is more economical, effective, more convenient and more applicable.
In order to achieve the aim, the plastic crack-reducing material comprises a high-water-absorptivity polymer, cellulose ether and polyether, and comprises the following components in percentage by mass:
0 to 100% of a super absorbent polymer
0 to 100 percent of cellulose ether
0 to 100 percent of polyether
The total amount of the components is 100 percent.
The preferable mass percentages of the components are as follows:
1 to 70 percent of high water absorption polymer
1-60% of cellulose ether
1 to 50 percent of polyether
The total amount of the components is 100 percent.
In the present invention, the super absorbent polymer includes polyacrylamide and sodium polyacrylate; the cellulose ether comprises hydroxyethyl methyl cellulose and hydroxypropyl methyl cellulose; the polyether includes propylene glycol polyether and glycerol polyether.
The preparation method of the invention comprises the following steps: weighing the super absorbent polymer, the cellulose ether and the polyether according to the mass percentage, placing the mixture in a mixing container, and uniformly stirring to obtain the product of the invention.
The plastic crack-reducing material is a solid powder material or a liquid material, and the product is packaged into a bag or a barrel after being metered, and the moisture and fire prevention are required during storage.
The use method of the plastic crack-reducing material comprises the following steps: the plastic crack reducing material is prepared by weighing 0.01-0.1% of the cement in the cement-based material, adding the plastic crack reducing material after the cement-based material is stirred, continuously stirring and uniformly mixing. Or the plastic crack reducing material of the invention and other cement-based materials are added and stirred together and mixed evenly. And finally, performing the working procedures of pouring, vibrating, plastering, maintaining and the like according to the conventional regulations.
The invention can be widely used in cement-based material engineering, such as cement concrete pavement, bridge deck, terrace, slope protection, dam, airport runway and other engineering, to improve the resistance of cement-based material to plastic shrinkage cracking and other performances.
The invention has the following advantages:
1, after the plastic shrinkage cracking reducing material is added, the plastic shrinkage cracking performance of the cement-based material can be greatly reduced, and the total weight value of the plastic shrinkage cracking of the cement-based material can be reduced by 50-100 percent compared with that of a cement-based material without the plastic shrinkage cracking material when the mortar flat plate method is adopted for testing.
2, after the plastic crack-reducing material is added, the workability, compressive strength, flexural strength and the like of the cement-based material are not affected and can even be improved.
3, after the plastic crack-reducing material is added, the impermeability, frost resistance and the like of the cement-based material can be improved to a certain degree.
Detailed Description
The invention is further described below by way of examples.
Example 1
The plastic crack reducing material comprises the following components in percentage by mass: 50% of high water absorption polymer, 30% of cellulose ether and 20% of polyether. The high water absorption polymer is selected from polyacrylamide; the cellulose ether is hydroxyethyl methyl cellulose, and the polyether is propylene glycol polyether. The materials are weighed according to the proportion and are placed in a mixing container to be uniformly stirred, and the product of the invention is obtained.
After the product is mixed into cement mortar (42.5 ordinary cement: medium sand: water 1: 0.5) by 0.01 percent of mass percent, the reduction rate of plastic shrinkage cracking is about 50 percent by adopting a flat plate method.
Example 2
The plastic crack-reducing material comprises the following components in percentage by mass: 40% of high water absorption polymer, 40% of cellulose ether and 20% of polyether. The high water absorption polymer is sodium polyacrylate; the cellulose ether is hydroxypropyl methylcellulose, and the polyether is glycerol polyether. The materials are weighed according to the proportion and are placed in a mixing container to be uniformly stirred, and the product of the invention is obtained.
After the product of the invention is mixed into cement mortar (42.5 ordinary cement: medium sand: water is 1: 0.5) by mass fraction of 0.1%, the reduction rate of plastic shrinkage cracking is about 100% by adopting a flat plate method.
Example 3
The plastic crack-reducing material comprises the following components in percentage by mass: 50% of high water absorption polymer, 50% of cellulose ether and 0% of polyether. The high water absorption polymer is selected from polyacrylamide; the cellulose ether is hydroxyethyl methyl cellulose. The materials are weighed according to the proportion and are placed in a mixing container to be uniformly stirred, and the product of the invention is obtained. The product is mixed with cement mortar (42.5 ordinary cement: medium sand: water is 1: 0.5) by the mass fraction of 0.05 percent, and the reduction rate of plastic shrinkage cracking is about 80 percent by adopting a flat plate method.
Example 4
The plastic crack-reducing material comprises the following components in percentage by mass: 100% of high water absorption polymer, 0% of cellulose ether and 0% of polyether. The high water absorption polymer is selected from polyacrylamide. The materials are weighed according to the proportion and are placed in a mixing container to be uniformly stirred, and the product of the invention is obtained. The product is mixed into cement mortar (42.5 ordinary cement: medium sand: water is 1: 0.5) by mass fraction of 0.05%, and the reduction rate of plastic shrinkage cracking is about 60% by adopting a flat plate method.
Example 5
The plastic crack-reducing material comprises the following components in percentage by mass: 0% of high water absorption polymer, 100% of cellulose ether and 0% of polyether. The cellulose ether is hydroxyethyl methyl cellulose. The materials are weighed according to the proportion and are placed in a mixing container to be uniformly stirred, and the product of the invention is obtained. The product is mixed into cement mortar (42.5 ordinary cement: medium sand: water is 1: 0.5) by mass fraction of 0.03%, and the reduction rate of plastic shrinkage cracking is about 50% by adopting a flat plate method.
Example 6
The plastic crack-reducing material comprises the following components in percentage by mass: 0% of high water absorption polymer, 0% of cellulose ether and 100% of polyether. The polyether is propylene glycol polyether. The materials are weighed according to the proportion and are placed in a mixing container to be uniformly stirred, and the product of the invention is obtained. After the product is mixed into cement mortar (42.5 ordinary cement: medium sand: water is 1: 0.5) by the mass fraction of 0.02%, the reduction rate of plastic shrinkage cracking is about 50% by adopting a flat plate method.
Claims (1)
1. A plastic crack-reducing material of cement-based materials, characterized in that: the plastic crack-reducing material consists of a high water-absorbing polymer, cellulose ether and polyether, and comprises the following components in percentage by mass:
1 to 70 percent of high water absorption polymer
1-60% of cellulose ether
1 to 50 percent of polyether
The total amount meets 100 percent;
the high water absorption polymer comprises polyacrylamide and sodium polyacrylate; cellulose ethers include hydroxyethyl methylcellulose and hydroxypropyl methylcellulose; the polyether includes propylene glycol polyether and glycerol polyether.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711273697.XA CN108002740B (en) | 2017-12-06 | 2017-12-06 | Plasticity crack-reducing material of cement-based material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711273697.XA CN108002740B (en) | 2017-12-06 | 2017-12-06 | Plasticity crack-reducing material of cement-based material |
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| Publication Number | Publication Date |
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| CN108002740A CN108002740A (en) | 2018-05-08 |
| CN108002740B true CN108002740B (en) | 2021-02-26 |
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| CN115057654A (en) * | 2022-05-16 | 2022-09-16 | 中国路桥工程有限责任公司 | Concrete hydration temperature rise inhibition type mineral admixture and preparation and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101851078A (en) * | 2010-05-14 | 2010-10-06 | 惠州市红墙化学建材有限公司 | Curing agent in concrete and preparation method and use method thereof |
| CN104446174A (en) * | 2014-10-30 | 2015-03-25 | 中国铁道科学研究院铁道建筑研究所 | High-crack-resistant concrete suitable for severe environment and construction method thereof |
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2017
- 2017-12-06 CN CN201711273697.XA patent/CN108002740B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101851078A (en) * | 2010-05-14 | 2010-10-06 | 惠州市红墙化学建材有限公司 | Curing agent in concrete and preparation method and use method thereof |
| CN104446174A (en) * | 2014-10-30 | 2015-03-25 | 中国铁道科学研究院铁道建筑研究所 | High-crack-resistant concrete suitable for severe environment and construction method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 内养护对混凝土抗裂性及水化的影响;朱长华等;《建筑材料学报》;20130430;第225页"2.5 SAP内养护作用机理分析" * |
| 朱长华等.内养护对混凝土抗裂性及水化的影响.《建筑材料学报》.2013,第225页"2.5 SAP内养护作用机理分析". * |
| 桂苗苗等.聚合物对水泥砂浆塑性自由收缩量的影响.《万方数据知识服务平台》.2017,第112页"1 引言"，第113页"2.1 原材料"，第114页"3.1 纤维素醚对砂浆塑性自由收缩量的影响"，图2-3. * |
| 聚合物对水泥砂浆塑性自由收缩量的影响;桂苗苗等;《万方数据知识服务平台》;20170223;第112页"1 引言"，第113页"2.1 原材料"，第114页"3.1 纤维素醚对砂浆塑性自由收缩量的影响"，图2-3 * |
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