CN112661464A - Liquid crystal polyarylester fiber reinforced concrete and preparation method thereof - Google Patents
Liquid crystal polyarylester fiber reinforced concrete and preparation method thereof Download PDFInfo
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- CN112661464A CN112661464A CN202110088354.6A CN202110088354A CN112661464A CN 112661464 A CN112661464 A CN 112661464A CN 202110088354 A CN202110088354 A CN 202110088354A CN 112661464 A CN112661464 A CN 112661464A
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Abstract
The invention discloses liquid crystal polyarylester fiber reinforced concrete and a preparation method thereof, wherein the liquid crystal polyarylester fiber reinforced concrete comprises the following raw materials in parts by weight: 200-300 parts of cement, 185-215 parts of water, 700-800 parts of sand, 1000-1150 parts of aggregate, 1-3 parts of water reducing agent, 100-150 parts of fly ash and 0.5-5 parts of liquid crystal polyarylester fiber. The liquid crystal polyarylate fiber is used as a reinforcing material to be compounded with concrete, and has excellent promoting effects on crack resistance, low temperature resistance, weather resistance and toughening of the concrete.
Description
Technical Field
The invention relates to the technical field of composite building materials, in particular to liquid crystal polyarylester fiber reinforced concrete and a preparation method thereof.
Background
Ordinary concrete can satisfy the building requirement of general field, but in some fields, adopt ordinary concrete often can appear the fracture of different degree, and the factor of safety of engineering not only can be reduced in the appearance of these fractures, can reduce the benefit of engineering in addition to different degrees, reduces the durability of concrete to influence the life of engineering.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the technical defects of the background technology and provides liquid crystal polyarylester fiber reinforced concrete and a preparation method thereof. The liquid crystal polyarylate fiber is used as a reinforcing material to be compounded with concrete, and has excellent promoting effects on crack resistance, low temperature resistance, weather resistance and toughening of the concrete.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a liquid crystal polyarylate fiber reinforced concrete comprises the following raw materials in parts by weight: 200-300 parts of cement, 185-215 parts of water, 700-800 parts of sand, 1000-1150 parts of aggregate, 1-3 parts of water reducing agent, 100-150 parts of fly ash and 0.5-5 parts of liquid crystal polyarylester fiber.
Preferably, the cement is P.O42.5 ordinary portland cement meeting the regulations of GB 175-2007.
Preferably, the sand meets GB/T14684-2011 requirements.
Preferably, the aggregate meets GB/T14685-2011 requirements.
Preferably, the water reducing agent meets the requirements of GB 8076-.
Preferably, the fly ash meets the GB/T1596-2017 requirements.
Preferably, the length of the liquid crystal polyarylate fiber is 3 mm-60 mm, the diameter is 15-26 μm, the tensile strength is 2-4 GPa, the elastic modulus is 60-120 GPa, the ultimate elongation is 1% -4%, and the length-diameter ratio is more than 200.
More preferably, the length of the liquid crystalline polyarylate fiber is 12mm to 36 mm.
More preferably, the liquid crystalline polyarylate fibers have an aspect ratio of greater than 500.
The preparation method of the liquid crystal polyarylate fiber reinforced concrete comprises the following steps:
(1) preparing raw materials according to a formula;
(2) according to the formula, firstly, sequentially adding cement, fly ash, sand, aggregate and liquid crystal polyarylate fiber into a stirring device for pre-stirring, and then adding a mixture of water and a water reducing agent in the formula amount for uniformly stirring;
(3) and after stirring, subpackaging the mixture into a mold, oscillating the mixture on an oscillating table for 2-3 min, curing, and demolding to finally obtain the liquid crystal polyarylester fiber reinforced concrete.
Preferably, the step (2) is divided into a dry mixing process and a wet stirring process; firstly, sequentially adding and mixing cement, fly ash, sand, aggregate and liquid crystal polyarylate fiber, and carrying out dry stirring for 2-5 min until the mixture is uniformly mixed; and then adding a mixture of water and a water reducing agent according to the formula ratio for wet stirring, wherein the stirring speed is 15-60 r/min, and the stirring time is 3-12 min until the mixture is uniformly stirred.
The basic principle of the invention is as follows:
the liquid crystal polyarylate fiber is prepared by acetylating aromatic hydroxy acid monomers, performing ester exchange polycondensation reaction between the monomers to obtain thermotropic liquid crystal polyarylate, performing melt spinning and heat treatment to obtain the liquid crystal polyarylate fiber with high strength and modulus, excellent high temperature resistance, low temperature resistance, chemical corrosion resistance, weather resistance and dimensional stability, and can be applied to the fields with high requirements on mechanical properties, such as stab-resistant clothes, bullet-proof clothes, cutting-resistant gloves, ropes/cables, sports apparatuses and the like. The high temperature resistance, the low temperature resistance, the high strength, the high modulus and the high dimensional stability are important in the application field of the liquid crystal polyarylate fiber, the tensile strength of the fiber is 2-4 GPa, the elastic modulus of the fiber is 60-120 GPa, and the purpose of reinforcing concrete can be well achieved.
The liquid crystal polyarylate fiber reinforced concrete composite material is a composite material formed by taking concrete as a matrix and taking discontinuous liquid crystal polyarylate fibers which are randomly distributed as a reinforcing material. From the point of view of micro-mechanics principle, the material improves the interaction of the fiber, the matrix and the interface of the fiber and the matrix in the concrete-based material. The mechanism is as follows: the concrete has certain defects originally, and in order to improve the strength of the concrete, the degree of the internal defects must be reduced as much as possible, the toughness of the concrete is improved, and the stress concentration coefficient of the tip of the internal crack is reduced; when the crack extends to the transition area between the fiber and the base material, the bonding stress concentration coefficient caused by the tensile stress of the fiber is opposite to the stress concentration coefficient of the tip part of the crack, so the total stress concentration coefficient is equal to the difference value of the two, and the initial crack strength of the concrete is improved; but does not change the chemical properties of each component in the material, so that the durability of the material is not damaged; due to the incorporation of the liquid crystal polyarylate fibers, cracks generated by shrinkage of the concrete-based material in an early age period are obviously reduced, the impermeability and the durability of the concrete-based material are also obviously improved, the deformability of the concrete is improved to a certain extent, and the toughness, the impact resistance, the fatigue resistance and other properties of the concrete are enhanced.
Compared with the prior art, the invention has the beneficial effects that:
the common concrete has the problems of poor freezing resistance, crack resistance, toughness, impact resistance and the like, and has the phenomenon of low engineering safety coefficient to a certain extent, so that the overall durability and the service life of the common concrete are influenced; the liquid crystalline polyarylate fiber has excellent weather resistance, high temperature resistance and low temperature resistance, and has an enhanced effect under low temperature conditions; the liquid crystal polyarylate fiber is compounded with concrete as a reinforcing material, so that the frost resistance, crack resistance, toughness and impact resistance of the concrete are improved, the safety coefficient, durability and service life of the concrete are improved, and the liquid crystal polyarylate fiber has excellent promoting effects on crack resistance, low temperature resistance, weather resistance and toughening of the concrete.
Detailed Description
For a better understanding of the present invention, reference is made to the following examples. It is to be understood that these examples are for further illustration of the invention and are not intended to limit the scope of the invention. In addition, it should be understood that the invention is not limited to the above-described embodiments, but is capable of various modifications and changes within the scope of the invention.
Example 1-6A preparation method of liquid crystal polyarylate fiber reinforced concrete includes the following steps:
(1) preparing raw materials according to the formulations in table 1 and table 2;
(2) according to the formula, firstly, sequentially adding cement, fly ash, sand, aggregate and liquid crystal polyarylate fiber into a stirring device for pre-stirring, and then adding a mixture of water and a water reducing agent in the formula amount for uniformly stirring;
(3) and after stirring, subpackaging the mixture into a mold, oscillating the mixture on an oscillating table for 2-3 min, curing, and demolding to finally obtain the liquid crystal polyarylester fiber reinforced concrete.
The step (2) is divided into a dry mixing process and a wet stirring process; firstly, sequentially adding and mixing cement, fly ash, sand, aggregate and liquid crystal polyarylate fiber, and carrying out dry stirring for 2-5 min until the mixture is uniformly mixed; and then adding a mixture of water and a water reducing agent according to the formula ratio for wet stirring, wherein the stirring speed is 15-60 r/min, and the stirring time is 3-12 min until the mixture is uniformly stirred.
The preparation method of the plain concrete comprises the following steps:
(1) preparing raw materials according to the formulations in table 1 and table 2;
(2) according to the formula, firstly, sequentially adding cement, fly ash, sand and aggregate into a stirring device for pre-stirring, and then adding a mixture of water and a water reducing agent in the formula amount for uniformly stirring;
(3) and after stirring, subpackaging the mixture into a mold, oscillating the mixture on an oscillating table for 2-3 min, curing, and demolding to finally obtain the liquid crystal polyarylester fiber reinforced concrete.
The step (2) is divided into a dry mixing process and a wet stirring process; firstly, sequentially adding and mixing cement, fly ash, sand and aggregate, and performing dry stirring for 2-5 min until the mixture is uniformly mixed; and then adding a mixture of water and a water reducing agent according to the formula ratio for wet stirring, wherein the stirring speed is 15-60 r/min, and the stirring time is 3-12 min until the mixture is uniformly stirred.
TABLE 1 raw material formulation for liquid crystalline polyarylate fiber reinforced concrete and plain concrete prepared in examples 1 to 6
TABLE 2 Specifications of respective raw materials in liquid-crystalline polyarylate fiber-reinforced concrete and plain concrete prepared in examples 1 to 6
Effects of the embodiment
The crack resistance test data of the liquid crystal polyarylate fiber reinforced concrete and the plain concrete prepared in examples 1 to 6 are shown in table 3.
TABLE 3 anti-cracking test data table for liquid crystal polyarylate fiber reinforced concrete and plain concrete prepared in examples 1 to 6
Table 3 liquid crystalline polyarylate fiber crack resistance test data were measured on 500mm x 25mm concrete test pieces. As can be seen from Table 3, the crack resistance of the concrete doped with the liquid crystalline polyarylate fiber is significantly better than that of plain concrete. The total area of the cracks is far smaller than that of the cracks of the plain concrete, and the total area of the cracks in the test can be reduced by 97.08% at most.
The above description is not intended to limit the present invention, and the present invention is not limited to the above examples. Those skilled in the art should also realize that changes, modifications, additions and substitutions can be made without departing from the true spirit and scope of the invention.
Claims (10)
1. The liquid crystal polyarylate fiber reinforced concrete is characterized by comprising the following raw materials in parts by weight: 200-300 parts of cement, 185-215 parts of water, 700-800 parts of sand, 1000-1150 parts of aggregate, 1-3 parts of water reducing agent, 100-150 parts of fly ash and 0.5-5 parts of liquid crystal polyarylester fiber.
2. The liquid crystalline polyarylate fiber reinforced concrete of claim 1, wherein said cement is p.o42.5 ordinary portland cement meeting the regulations of GB 175-2007.
3. The liquid crystalline polyarylate fiber reinforced concrete of claim 1, wherein said sand meets GB/T14684-2011 requirements.
4. The liquid crystalline polyarylate fiber reinforced concrete of claim 1, wherein said aggregate meets GB/T14685-2011 requirements.
5. The liquid crystal polyarylate fiber reinforced concrete of claim 1, wherein said water reducing agent meets the requirements of GB 8076-2008.
6. The liquid crystalline polyarylate fiber reinforced concrete of claim 1, wherein said fly ash meets the requirements of GB/T1596-2017.
7. The liquid crystal polyarylate fiber reinforced concrete of claim 1, wherein the liquid crystal polyarylate fiber has a length of 3mm to 60mm, a diameter of 15 to 26 μm, a tensile strength of 2 to 4GPa, an elastic modulus of 60 to 120GPa, an ultimate elongation of 1 to 4%, and an aspect ratio of more than 200.
8. The liquid crystalline polyarylate fiber reinforced concrete of claim 7, wherein said liquid crystalline polyarylate fibers have a length of 12mm to 36mm and an aspect ratio of more than 500.
9. The method for preparing liquid crystal polyarylate fiber reinforced concrete according to any one of claims 1 to 8, comprising the steps of:
(1) preparing raw materials according to a formula;
(2) according to the formula, firstly, sequentially adding cement, fly ash, sand, aggregate and liquid crystal polyarylate fiber into a stirring device for pre-stirring, and then adding a mixture of water and a water reducing agent in the formula amount for uniformly stirring;
(3) and after stirring, subpackaging the mixture into a mold, oscillating the mixture on an oscillating table for 2-3 min, curing, and demolding to finally obtain the liquid crystal polyarylester fiber reinforced concrete.
10. The method for preparing liquid crystal polyarylate fiber reinforced concrete according to claim 9, wherein the step (2) is divided into dry mixing and wet stirring; firstly, sequentially adding and mixing cement, fly ash, sand, aggregate and liquid crystal polyarylate fiber, and carrying out dry stirring for 2-5 min until the mixture is uniformly mixed; and then adding a mixture of water and a water reducing agent according to the formula ratio for wet stirring, wherein the stirring speed is 15-60 r/min, and the stirring time is 3-12 min until the mixture is uniformly stirred.
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Citations (4)
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| JP2004315251A (en) * | 2003-04-11 | 2004-11-11 | Sumitomo Osaka Cement Co Ltd | High strength/high toughness cement compound material and method of manufacturing the same |
| CN108164216A (en) * | 2017-12-29 | 2018-06-15 | 上海建工集团股份有限公司 | A kind of answering for more than strength grade C100 mixes fiber concrete |
| CN108558296A (en) * | 2018-05-02 | 2018-09-21 | 芜湖恒固混凝土材料有限公司 | A kind of fiber reinforcement thermal insulation concrete wall |
| CN111003959A (en) * | 2019-10-25 | 2020-04-14 | 青岛理工大学 | Anti-knock and anti-impact multi-stage heterogeneous fiber prefabricated body composite concrete and preparation method thereof |
-
2021
- 2021-01-22 CN CN202110088354.6A patent/CN112661464A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004315251A (en) * | 2003-04-11 | 2004-11-11 | Sumitomo Osaka Cement Co Ltd | High strength/high toughness cement compound material and method of manufacturing the same |
| CN108164216A (en) * | 2017-12-29 | 2018-06-15 | 上海建工集团股份有限公司 | A kind of answering for more than strength grade C100 mixes fiber concrete |
| CN108558296A (en) * | 2018-05-02 | 2018-09-21 | 芜湖恒固混凝土材料有限公司 | A kind of fiber reinforcement thermal insulation concrete wall |
| CN111003959A (en) * | 2019-10-25 | 2020-04-14 | 青岛理工大学 | Anti-knock and anti-impact multi-stage heterogeneous fiber prefabricated body composite concrete and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| ICHINO H: ""Use of a polyarylate-glass fiber tompo-site textile to reduce localized blast damage in concrete plates"", 《SCIENCE AND TECHNOLOGY OF ENERGETIC MATERIALS》 * |
| 肖长发: "《纤维复合材料》", 31 August 1995, 中国石化出版社 * |
| 高科技纤维总览: ""高科技纤维总览"", 《高科技纤维与应用》 * |
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Inventor after: Luo Peidong Inventor after: Chen Yingrui Inventor after: Song Dan Inventor after: Luo Ting Inventor after: Xia Yumin Inventor after: Shi Binbin Inventor before: Luo Peidong Inventor before: Shi Binbin Inventor before: Song Dan Inventor before: Luo Ting Inventor before: Xia Yumin |
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Application publication date: 20210416 |