CN112209649A

CN112209649A - Composite double-fiber anti-cracking anti-seepage agent

Info

Publication number: CN112209649A
Application number: CN201910622201.8A
Authority: CN
Inventors: 陈金权
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2021-01-12

Abstract

The invention discloses a composite double-fiber anti-cracking anti-seepage agent, and belongs to the field of building materials. The composite double-fiber anti-cracking and anti-seepage agent comprises the following components in parts by weight: 25-35 parts of polypropylene fiber, 2-3 parts of cellulose polymer, 500 parts of anhydrite, 50-150 parts of high-alumina cement clinker, 25-75 parts of quick lime and 385 parts of carrier 350-sand; the anhydrite, the high-alumina cement clinker, the quicklime and the carrier jointly form the expanding agent. The anti-cracking effect can be improved, and the concrete is ensured to have higher anti-seepage property.

Description

Composite double-fiber anti-cracking anti-seepage agent

Technical Field

The invention relates to a composite double-fiber anti-cracking anti-seepage agent, belonging to the field of building materials. The double fibers are polypropylene fibers and cellulose polymers respectively. The product is prepared by compounding the double fibers and the expanding agent together to form the double-fiber anti-cracking and anti-seepage agent.

Background

Concrete is a general term for engineering composite materials formed by cementing aggregates into a whole by gel materials, is generally prepared by mixing cement serving as a gel material, sand and stone serving as aggregates with water according to a certain proportion and stirring, and is one of the most important civil engineering materials in the present generation. Because the concrete, especially the mass concrete and the high-strength concrete, generally has the shrinkage phenomenon, the concrete is easy to crack, and the performance of the concrete such as strength, seepage resistance, corrosion resistance and the like is reduced.

In order to prevent the concrete from cracking due to shrinkage, an expanding agent is usually added into the concrete, the expanding agent is mixed into the cement to form shrinkage-compensating concrete, the expansion rate generated under the limited condition is 0.02-0.04%, and under the constraint of reinforcing steel bars and the like, a pre-compressive stress of 0.2-0.7MPa can be generated in the concrete, and the pre-compressive stress can approximately offset the shrinkage tensile stress generated in the concrete hardening process, so that the cracks are eliminated or reduced, and the strength of the concrete can be improved.

The existing concrete needs to realize the functions of cracking resistance and seepage prevention, and fibers or an expanding agent or an anti-seepage agent is usually added in the concrete stirring overshoot. If only the expanding agent is added, the purposes of changing the stress state and reducing the generation of shrinkage cracks in the concrete are achieved, but meanwhile, the concrete seepage prevention still does not achieve the best effect. However, if only the fibers are added, the fibers are not dispersed during the stirring process in the concrete stirring station, and even the fibers are agglomerated in the concrete, which is more likely to crack the concrete.

The friendship effect of the invention is: the double anti-cracking function of the polypropylene fiber and the expanding agent on the concrete is adopted, so that the anti-cracking effect of the concrete is better, and meanwhile, the anti-seepage function is higher; in the production process of the product, the polypropylene monofilament fiber, the cellulose polymer and the expanding agent are uniformly mixed and compounded together according to the proportion, and the polypropylene monofilament fiber is completely and uniformly dispersed in the double-fiber anti-cracking and anti-seepage agent product by using professional production equipment, so that the defects that the polypropylene fiber is difficult to be fully mixed when being added independently in a concrete mixing plant, and the fibers are agglomerated in concrete, so that the concrete is cracked more seriously are overcome; the problem that the seepage-proofing effect is not ideal when the expanding agent is added independently is solved; the addition of the cellulose polymer can make the concrete more compact, block capillary water seepage channels in the concrete and greatly improve the impermeability of the concrete.

Disclosure of Invention

In order to solve the problem that concrete is easy to crack or the anti-seepage effect is improved in the prior art, the invention provides a composite double-fiber anti-cracking anti-seepage agent, and the specific scheme is as follows:

the composite double-fiber anti-cracking and anti-seepage agent comprises the following components in parts by weight: 25-35 parts of polypropylene fiber, 2-3 parts of cellulose polymer, 500 parts of anhydrite, 50-150 parts of high-alumina cement clinker, 25-75 parts of quick lime and 385 parts of carrier 350-sand; the anhydrite, the high-alumina cement clinker, the quicklime and the carrier jointly form the expanding agent.

Preferably, the anti-seepage agent comprises the following components in parts by weight: 30 parts of polypropylene fiber, 2.5 parts of fiber polymer, 450 parts of anhydrite, 100 parts of high-alumina cement clinker, 50 parts of quicklime and 367.5 parts of carrier; the anhydrite, the high-alumina cement clinker, the quicklime and the carrier jointly form the expanding agent.

Preferably, the polypropylene fibers are in particular monofilament polypropylene fibers of 6 to 18 mm.

Preferably, the fibre polymer is in particular a cellulose ether and an air entraining component.

Preferably, the carrier is specifically fly ash and plays a role of bearing in the anti-seepage agent.

The invention has the beneficial effects that: the polypropylene fiber is used, so that the (tensile, compressive and bending) strength, toughness, ductility, impact fatigue resistance and deformation modulus of the concrete can be obviously improved, and the polypropylene fiber plays a role in crack resistance and toughening of the concrete; the expanding agent which is formed by the anhydrite, the high-alumina cement clinker, the quicklime and the carrier is selected to react with the cement to generate a large amount of mineral phases, so that the concrete is expanded, and the shrinkage and cracking of the concrete are effectively prevented; the cellulose in the cellulose polymer enables the concrete to be more compact, and the air-entraining components can generate fine bubbles in the concrete, so that the frost resistance of the concrete is greatly improved; the physical crack resistance of the polypropylene monofilament fiber and the chemical crack resistance of the expanding agent act together, so that the crack resistance of the concrete is greatly improved; when a special equipment product is used for production, the polypropylene monofilament fiber is uniformly dispersed in the double-fiber anti-cracking and anti-seepage agent product, so that the problem that the added fiber is not uniformly dispersed and agglomerated in a concrete mixing plant, but the concrete is more easily cracked is solved, and the concrete has better anti-seepage effect while the anti-cracking performance is improved.

Detailed Description

The materials, methods and apparatus used in the following examples, which are not specifically illustrated, are conventional in the art and are commercially available to those of ordinary skill in the art.

In the following description of the present invention, "plurality", and "plural" mean two or more unless otherwise specified.

The present invention is described in further detail below, but the following detailed description is not to be construed as limiting the invention.

Example 1

The composite double-fiber anti-cracking and anti-seepage agent in the embodiment comprises the following components in parts by weight: 25 parts of polypropylene monofilament fiber, 2 parts of cellulose polymer, 400 parts of anhydrite, 50 parts of high-alumina cement clinker, 25 parts of quicklime and 350 parts of fly ash, wherein the anhydrite, the high-alumina cement clinker, the quicklime and the fly ash jointly form the expanding agent.

Example 2

The composite double-fiber anti-cracking and anti-seepage agent in the embodiment comprises the following components in parts by weight: 30 parts of polypropylene monofilament fiber, 2.5 parts of cellulose polymer, 450 parts of anhydrite, 100 parts of high-alumina cement clinker, 50 parts of quicklime and 367.5 parts of fly ash, wherein the anhydrite, the high-alumina cement clinker, the quicklime and the fly ash jointly form an expanding agent.

Example 3

The composite double-fiber anti-cracking and anti-seepage agent in the embodiment comprises the following components in parts by weight: 35 parts of polypropylene monofilament fiber, 3 parts of cellulose polymer, 500 parts of anhydrite, 150 parts of high-alumina cement clinker, 75 parts of quicklime and 385 parts of fly ash, wherein the anhydrite, the high-alumina cement clinker, the quicklime and the fly ash jointly form an expanding agent.

In order to test the performance of the composite bifibre anti-cracking and anti-seepage agent in the examples 1-3, the anti-seepage agent in each example is added with a finished product of anti-seepage agent according to 8% of the weight of concrete, and then a concrete sample is tested and compared with a blank concrete without the anti-seepage agent, and the performance test result is shown in table 1.

Table 1 examples 1-3 performance test data for composite bi-fiber crack-resistant and anti-seepage agent

And (4) conclusion: as can be seen from the above table, the composite bifibre anti-cracking and anti-seepage agent of the embodiments 1-3 has the advantages that the permeation height ratio is less than or equal to 40%, the compressive strength ratio is more than or equal to 100% at 28d, the limited expansion rate in water is more than or equal to 0.035% at 7d, the limited expansion rate in water is more than or equal to 0.015% at 14d, the limited expansion rate in air is more than or equal to-0.02% at 21d, the setting time is similar to that of common concrete, the bleeding property and the segregation resistance of the concrete can be obviously reduced, and the breaking strength can be improved by more than 200%, so that the composite bifibre anti-cracking and anti-seepage agent can; in addition, when examples 1 to 3 are compared with each other, it can be seen that each test performance of example 2 is superior to that of the other two examples, and thus example 2 is the most preferred example.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The composite double-fiber anti-cracking and anti-seepage agent is characterized in that: the anti-seepage agent comprises the following components in parts by weight: 25-35 parts of polypropylene fiber, 2-3 parts of cellulose polymer, 500 parts of anhydrite, 50-150 parts of high-alumina cement clinker, 25-75 parts of quick lime and 385 parts of carrier 350-sand; the anhydrite, the high-alumina cement clinker, the quicklime and the carrier jointly form the expanding agent.

2. The composite bifibre crack-resistant and seepage-resistant agent as claimed in claim 1, wherein: the anti-seepage agent comprises the following components in parts by weight: 30 parts of polypropylene fiber, 2.5 parts of fiber polymer, 450 parts of anhydrite, 100 parts of high-alumina cement clinker, 50 parts of quicklime and 367.5 parts of carrier; the anhydrite, the high-alumina cement clinker, the quicklime and the carrier jointly form the expanding agent.

3. The composite bifibre crack-resistant and seepage-resistant agent as claimed in claim 2, wherein: the polypropylene fiber is a monofilament polypropylene fiber with the thickness of 6-18 mm.

4. The composite bifibre crack-resistant and seepage-resistant agent as claimed in claim 2, wherein: the fiber polymer is specifically a cellulose ether and triterpenoid saponin air entraining component.

5. The composite bifibre crack-resistant and seepage-resistant agent as claimed in claim 2, wherein: during the production of the anti-seepage agent, the polypropylene fiber is uniformly dispersed in the product through professional special equipment, so that the defect that the fiber cannot be dispersed in the stirring process when the fiber is added in a stirring station is overcome.