CN108002740B - A plastic crack reduction material for cement-based materials - Google Patents
A plastic crack reduction material for cement-based materials Download PDFInfo
- Publication number
- 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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- Prior art keywords
- cement
- plastic
- polyether
- based material
- cracking
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- 239000000463 material Substances 0.000 title claims abstract description 63
- 239000004033 plastic Substances 0.000 title claims abstract description 46
- 229920003023 plastic Polymers 0.000 title claims abstract description 46
- 239000004568 cement Substances 0.000 title claims abstract description 36
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 25
- 229920000570 polyether Polymers 0.000 claims abstract description 25
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 229920000642 polymer Polymers 0.000 claims description 15
- 238000010521 absorption reaction Methods 0.000 claims description 13
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 12
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 3
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 3
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 3
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 3
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 22
- 239000004567 concrete Substances 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 11
- 238000002156 mixing Methods 0.000 abstract description 10
- 229920000247 superabsorbent polymer Polymers 0.000 abstract description 4
- 238000003756 stirring Methods 0.000 abstract description 3
- 239000004570 mortar (masonry) Substances 0.000 abstract description 2
- 239000011083 cement mortar Substances 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 239000004566 building material Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000003796 beauty Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- 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
本发明涉及一种水泥基材料的塑性减裂材料，属于材料科学与工程技术领域。由0～100％高吸水性聚合物、0～100％纤维素醚和0～100％聚醚组成。按上述质量百分比计量，置于混料容器搅匀，即得到本发明产品。使用时塑性减裂材料的掺量为水泥基材料中水泥质量的0.01～0.1％。塑性减裂材料掺入后，水泥基材料的塑性收缩开裂性能大幅度减小，采用砂浆平板法测试时，其塑性收缩开裂总权重值比不掺者可减少50％‑100％；水泥基材料的和易性、抗压强度、抗折强度等不受影响，甚至可以有所提高；水泥基材料的抗渗性、抗冻性等可得到一定程度的改善。使用了本发明的水泥基材料工程，如水泥混凝土路面、桥面、地坪、护坡、大坝、机场跑道等工程，其塑性收缩开裂程度减少。The invention relates to a plastic crack reduction material for cement-based materials, belonging to the technical field of material science and engineering. It is composed of 0-100% super absorbent polymer, 0-100% cellulose ether and 0-100% polyether. Measured according to the above-mentioned mass percentage, place in a mixing container and stir to obtain the product of the present invention. When used, the content of the plastic crack reduction material is 0.01-0.1% of the cement quality in the cement-based material. After the plastic crack reduction material is added, the plastic shrinkage cracking performance of the cement-based material is greatly reduced. When the mortar plate method is used to test, the total weight value of the plastic shrinkage cracking can be reduced by 50%-100% compared with the one without mixing; the cement-based material The workability, compressive strength and flexural strength are not affected, and can even be improved; the impermeability and frost resistance of cement-based materials can be improved to a certain extent. Using the cement-based material engineering of the present invention, such as cement concrete pavement, bridge deck, floor, slope protection, dam, airport runway, etc., the degree of plastic shrinkage and cracking 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711273697.XA CN108002740B (en) | 2017-12-06 | 2017-12-06 | A plastic crack reduction material for cement-based materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711273697.XA CN108002740B (en) | 2017-12-06 | 2017-12-06 | A plastic crack reduction material for cement-based materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108002740A CN108002740A (en) | 2018-05-08 |
| CN108002740B true CN108002740B (en) | 2021-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711273697.XA Expired - Fee Related CN108002740B (en) | 2017-12-06 | 2017-12-06 | A plastic crack reduction material for cement-based materials |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 not_active Expired - Fee Related
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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| Publication number | Publication date |
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| CN108002740A (en) | 2018-05-08 |
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