CN114775285A - PVA fiber dispersion treatment method for preparing ECC concrete - Google Patents

Abstract

The invention belongs to the technical field of PVA fiber dispersion treatment, and provides a PVA fiber dispersion treatment method for preparing ECC concrete, which mainly comprises the following steps: s10, spraying and cleaning a PVA fiber material to be processed; s20, drying the cleaned PVA fiber material; s30, sequentially infiltrating and padding the PVA fiber material; s40, drying the PVA fiber material subjected to surface treatment; s50, arranging a fiber screen and a first fan, and enabling the PVA fiber material subjected to post-drying operation to move towards the fiber screen under the action of the first fan and be separated and discharged from the mesh part of the fiber screen; s60, collecting; and temporarily storing and collecting the dispersed PVA fibers. The invention can effectively overcome the problems of large discreteness and easy cluster stirring of PVA fiber in the traditional technology, and ensure the dispersion quality of the PVA fiber in the process of putting.

Description

A kind of PVA fiber dispersion treatment method for preparing ECC concrete

technical field

The invention belongs to the technical field of PVA fiber dispersion treatment, in particular to a PVA fiber dispersion treatment method for preparing ECC concrete.

Background technique

High ductility cementitious composites (Engineered Cementitious Composites, ECC) is a special high-performance fiber-reinforced cementitious material, it is designed based on micromechanics and fracture mechanics theory, by adjusting the fiber, matrix and fiber-matrix interface properties and other means. control its mechanical properties. The material is formed by adding a certain volume of polyvinyl alcohol (PVA) short fibers on a matrix composed of water, Portland cement, quartz sand, fly ash and high-performance water reducing agent, and is compatible with ordinary concrete, Compared with fiber reinforced concrete (including steel fiber reinforced concrete, plant fiber reinforced concrete and carbon fiber reinforced concrete) and high performance concrete, its toughness, durability and fatigue resistance have been greatly improved and improved. Among them, the degree of uniform dispersion of PVA fibers is one of the key factors affecting its performance.

In the existing ECC concrete preparation process, the phenomenon of poor dispersion quality of PVA fibers is prone to occur.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a PVA fiber dispersion treatment method for preparing ECC concrete, to effectively overcome the situation that the PVA fibers in the traditional technology have large discreteness and are easy to agglomerate when throwing in, and ensure that PVA The dispersion quality of the fibers at the time of delivery.

The technical scheme adopted by the present invention to solve its technical problems is:

A PVA fiber dispersion treatment method for preparing ECC concrete, comprising the following steps:

S10. Cleaning; spray cleaning the PVA fiber material to be processed, the PVA fiber material in the spray cleaning process needs to be completely soaked by a cleaning solution, wherein the cleaning solution includes a surfactant and a NaOH mixed solution, and the cleaning solution The temperature of the liquid is not lower than 60 ℃;

S20. pre-drying; drying the cleaned PVA fiber material, wherein, before drying, the heat source output is turned off, the PVA fiber material is stirred at one level, and then the heat source output is turned on and the PVA fiber is The material is agitated in two stages, and the drying temperature of the heat source is not lower than 80°C;

S30. Surface treatment; infiltrating and padding treatment are performed on the PVA fiber material in sequence. During the infiltration treatment, the PVA fiber material is sprayed and soaked with a treatment liquid, and the treatment liquid includes a first treatment agent liquid and a second treatment liquid. Treatment agent liquid, wherein the first treatment agent liquid includes polyacrylate and polyurethane aqueous emulsion, and the second treatment agent liquid includes silicone emulsion; PVA fiber material for printing and rolling;

S40. Post-drying; drying the surface-treated PVA fiber material, wherein the PVA fiber material is placed flat, and the drying temperature of the heat source is not lower than 80° C.;

S50. Dispersion treatment; set a fiber screen and a first fan, and make the PVA fiber material after the post-drying operation move to the fiber screen under the action of the first fan, and automatically The meshes of the fiber screen are separated and penetrated, wherein the meshes on the fiber screen are set according to dispersion requirements;

S60. Collection; temporarily store and collect the dispersed PVA fibers.

Further, in step S10, a cleaning device is provided, and the cleaning device is provided with a first conveyor belt for conveying the PVA fiber material and several first nozzles for spraying the cleaning liquid;

A number of the first nozzles are arranged above the first conveyor belt and arranged along the conveying direction of the first conveyor belt, and the water temperature of the cleaning liquid sprayed from the first nozzles is controlled at 80 -100°C.

Further, a cycle processing step is formed between step S20 and step S10, wherein, one continuous cleaning, primary stirring and secondary stirring are used as a single cycle processing step cycle, and the need to be selected according to the condition of the PVA fiber material is selected. The cycle number of the cycle processing step cycle.

Further, in step S20, a front drying device is provided, and several stirring wheels and several first heat lamps are arranged in the front drying device;

The axes of a plurality of stirring wheels are arranged horizontally, and a plurality of the first heat lamps are arranged above the stirring wheels along the conveying direction of the PVA fiber material.

Further, the drying temperature of the first heat energy lamp is controlled between 100-120° C., and the single drying time is controlled between 5-10 minutes.

Further, in step S30, a cyclic processing flow is formed between the soaking treatment and the padding treatment, wherein one continuous soaking treatment and padding treatment are performed as a single circulation treatment flow cycle, and the selection is made according to the condition of the PVA fiber material. The number of cycles of the cycle processing flow cycle that needs to be performed.

Further, in step S30, a surface treatment device is provided, and an infiltration working area and a padding working area are sequentially arranged in the surface treatment device along the conveying direction of the PVA fiber material;

A plurality of second nozzles for spraying treatment liquid are arranged in the soaking working area, and the roller group is arranged in the padding working area.

Further, in step S40, a post-drying device is provided, and the post-drying device is provided with a second conveyor belt for conveying the PVA fiber material and several second heat lamps;

A plurality of the second heat lamps are arranged above the second conveyor belt and arranged along the conveying direction of the second conveyor belt.

Further, in step S50, a dispersion processing device is provided, the dispersion processing device includes a first worktable, and along the conveying direction of the PVA fiber material, the material input end of the first worktable is provided with the first worktable. a fan, the fiber screen is arranged at the material output end of the first workbench;

Several guide stirring wheels are arranged on both sides of the end face of the first workbench.

Further, in step S60, a throwing device is provided, and the throwing device includes a second workbench and a second fan, and along the conveying direction of the PVA fiber material, the second fan is arranged on the side of the second workbench. material input;

Two sides of the material output end of the second workbench are provided with inclined guide plates, and a throw-in port is formed between the two inclined guide plates.

Compared with the prior art, the beneficial effects of the present invention include:

This solution is simple to operate, can strictly control the surface treatment quality of PVA fibers during the preparation of ECC concrete, solves the problem of unstable quality of PVA fibers, and enables better bonding performance between PVA fibers and concrete in subsequent use.

At the same time, this solution can be applied to the automatic dispersion and delivery of PVA fibers in the preparation of ECC concrete, which saves time and effort. Compared with traditional technologies such as manual dispersion, it can effectively improve the dispersion efficiency and dispersion quality, and improve the performance of PVA fibers in the delivery process. uniformity, reduce or even avoid the occurrence of agglomeration.

Description of drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention, which are of great significance to the art For those of ordinary skill, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a system schematic diagram of the distributed processing method of the present invention.

FIG. 2 is a schematic structural diagram of the cleaning device of the present invention.

FIG. 3 is a schematic structural diagram of the first drying device of the present invention.

FIG. 4 is a schematic structural diagram of the surface treatment device of the present invention.

FIG. 5 is a schematic structural diagram of the second drying device of the present invention.

FIG. 6 is a schematic structural diagram of the dispersing device of the present invention.

FIG. 7 is a schematic structural diagram of the delivery device of the present invention.

in:

1-PVA fiber material;

2-cleaning device, 21-first conveyor belt, 22-first nozzle;

3-front drying device, 31-stirring wheel, 32-first heat lamp;

4-surface treatment device, 41-second nozzle, 42-roller group;

5-post drying device, 51-second conveyor belt, 52-second heat lamp;

6-dispersion treatment device, 61-first workbench, 62-first fan, 63-fiber screen, 64-guide stirring wheel;

7- throwing device, 71- second workbench, 72- second fan, 73- inclined guide plate, 74- throwing port;

8- Concrete mixing equipment.

Detailed ways

In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features of the embodiments may be combined with each other unless there is conflict. In the following description, many specific details are set forth in order to facilitate a full understanding of the present invention, and the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

Example 1

As shown in Figures 1-7, the present embodiment provides a PVA fiber dispersion treatment method for preparing ECC concrete, which mainly includes the following steps:

S10. Cleaning. The PVA fiber material 1 to be processed is cleaned, so as to clean the textile oil, dust and other impurities adhering to the fiber surface of the PVA fiber material 1 during the production process. As a preferred way, in this scheme, the PVA fiber material 1 is cleaned by spray cleaning, and the spray method can effectively facilitate the falling off of dust and impurities; at the same time, in the spray cleaning process, the PVA fiber material 1 It needs to be completely wetted by the cleaning liquid so as to facilitate sufficient reaction between the cleaning liquid and the PVA fiber material 1 .

Wherein, the cleaning solution includes a mixed solution of surfactant and NaOH; here, the surfactant can be aliphatic alcohol polyoxyethylene ether. The temperature of the cleaning solution should not be lower than 60°C. As an application example, the temperature of the cleaning solution in this solution is controlled between 80°C and 100°C to effectively remove the surface of the PVA fiber material 1. Textile oil stains and some impurities.

Further, in this embodiment, a cleaning device 2 is provided for performing the cleaning processing operation in step S10. The cleaning device 2 is provided with a first conveyor belt 21 and a number of first nozzles 22. After the PVA fiber material 1 enters the cleaning device 2, it will fall on the surface of the first conveyor belt 21 and follow the steps of the cleaning device 2. With the operation of the first conveyor belt 21, it is transported to the next processing station or process; a plurality of the first spray heads 22 are used for synchronously and uniformly spraying the cleaning liquid. A plurality of the first spray heads 22 are arranged above the first conveyor belt 21 and arranged along the conveying direction of the first conveyor belt 21 to ensure spray quality.

S20. Dry before. The first drying treatment is performed on the cleaned PVA fiber material 1; wherein, the output of the heat source is turned off before drying, and the PVA fiber material 1 is stirred for the first time, so that the cleaning solution and the PVA fiber are mixed with each other. The material 1 can be mixed more thoroughly; when the mixing is uniform, the cleaning liquid is discharged. Then, the output of the heat source is turned on and the secondary stirring of the PVA fiber material 1 is performed, so that the PVA fiber material 1 can be heated and dried evenly.

Further, in this embodiment, a pre-drying device 3 for performing the first drying process in step S20 is provided. The front drying device 3 is provided with a number of stirring wheels 31 and a number of first heat lamps 32; as a preferred solution, in this embodiment, the axes of the several stirring wheels 31 are arranged horizontally, so that During the stirring process, the PVA fiber material 1 has a movement process from a low place to a high place, and then from a high place to a low place, so that the PVA fiber material 1 and the cleaning solution can be moved. The mixing and stirring effect is better; moreover, in this stirring form, when in the drying process, the PVA fiber material 1 can also be attached to the wheel surface of the stirring wheel 31 more and more evenly, so that it can be Increase the drying area, the drying effect is better. A plurality of the first heat lamps 32 are uniformly arranged above the stirring wheel 31 along the conveying direction of the PVA fiber material 1 .

Wherein, the drying temperature of the heat source should not be lower than 80°C; as an application example, in this embodiment, the drying temperature of the first heat lamp 32 is controlled between 100-120°C, and the single The second drying time is controlled between 5-10 minutes. In addition, as one of the preferred application examples, in this embodiment, a cyclic processing step is formed between step S20 and step S10, and here one continuous cleaning, primary stirring and secondary stirring are performed as a single cyclic processing step Cycle, the user can select the number of cycles of the cycle processing step cycle to be performed according to the current condition of the PVA fiber material 1 to ensure that the surface of the PVA fiber material 1 is clean.

S30. Surface treatment. The PVA fiber material 1 after the first drying treatment is subjected to infiltration and padding treatment in sequence; wherein, in the infiltration treatment, the PVA fiber material 1 is sprayed and soaked with a treatment liquid, so that the PVA The fiber material 1 is immersed in the treatment liquid, and the fiber surface thereof is sufficiently adhered to the treatment liquid. In this solution, the treatment liquid includes a first treatment agent liquid and a second treatment agent liquid, wherein the first treatment agent liquid includes polyacrylate and polyurethane aqueous emulsion to enhance the mechanical properties of the PVA fiber material; The second treatment agent liquid includes an organosilicon emulsion, which can improve the bonding performance between the fiber surface and the concrete. In the padding process, the PVA fiber material 1 after the soaking treatment is subjected to printing and rolling through a number of roller groups 42, so as to press the treatment liquid on the surface of the fiber by a certain printing and rolling pressure, so as to ensure that all The surface quality of the PVA fiber material 1.

Further, in this embodiment, a surface treatment device 4 for performing the surface treatment operation in step S30 is provided. In the surface treatment device 4, along the conveying direction of the PVA fiber material 1, a soaking working area and a padding working area are sequentially arranged; The roll group 42 is arranged in the padding working area.

As a preferred application example, in step S30, a cyclic processing flow is formed between the soaking treatment and the padding treatment, wherein, in order to perform one continuous soaking treatment and padding treatment as a single cycle processing flow cycle, the user can The current condition of the PVA fiber material 1 is used to select the number of cycles of the cycle treatment process cycle to be performed.

S40. Post drying. The surface-treated PVA fiber material 1 is subjected to a second drying treatment, wherein the PVA fiber material 1 is laid flat, and the drying temperature of the heat source is controlled at not lower than 80°C.

Further, in this embodiment, a post-drying device 5 for performing the second drying process in step S40 is provided. The post-drying device 5 is provided with a second conveyor belt 51 and several second heat lamps 52 for conveying the PVA fiber material 1 , and the PVA fiber material 1 is laid on the second conveyor belt 51 . , and can be conveyed to the next station or process along with the operation of the second conveyor belt 51; a number of the second heat lamps 52 are arranged above the second conveyor belt 51, and along the first The conveying directions of the second conveyor belts 51 are uniformly arranged, so that the PVA fiber material 1 laid on the second conveyor belt 51 can be uniformly heated. As an application example given therein, when performing the second drying treatment, the drying temperature should be controlled at about 100-120° C., and the drying time should be set between 5-10 minutes each time.

S50. Dispersed processing. The PVA fiber material 1 after completing the second drying treatment is subjected to a dispersion treatment. For this, a fiber screen 63 and a first fan 62 are set in this scheme, and the PVA fiber after the post-drying operation is made. The material 1 will move to the fiber screen 63 under the action of the first fan 62, and will be separated and penetrated from the mesh of the fiber screen 63 to complete the dispersion operation; wherein, the fiber The meshes on the screen 63 are set according to the dispersion requirements.

Further, in this embodiment, a distributed processing device 6 for performing distributed processing in step S50 is provided. The dispersion treatment device 6 includes a first worktable 61, and along the conveying direction of the PVA fiber material 1, the first fan 62 is provided at the material input end of the first worktable 61, A material output end of a workbench 61 is provided with the fiber screen 63; by controlling the wind speed and wind pressure of the first fan 62, the PVA fibers passing through the fiber screen 63 per unit time can be controlled. The amount of material 1 is simple and convenient to operate.

As a preferred solution, in this embodiment, a number of guide stirring wheels 64 are also provided on both sides of the end face of the first worktable 61. The provided guide stirring wheels 64 can effectively ensure that all the The PVA fiber material 1 on the first workbench 61 can be concentrated in the middle of the first workbench 61, so as to be better placed in the wind action range of the first fan 62, so that the PVA can be easily Dispersing operation of fibrous material 1.

S60. Collection. Temporarily store and collect the dispersed PVA fiber material 1, so as to facilitate subsequent mixing with concrete.

Further, in this embodiment, a drop-in device 7 for collecting and re-dropping in step S60 is provided. The feeding device 7 includes a second workbench 71 and a second fan 72, and along the conveying direction of the PVA fiber material 1, the second fan 72 is disposed at the material input end of the second workbench 71; On both sides of the material output end of the second workbench 71 , inclined guide plates 73 are provided, and the flared ends formed between the inclined guide plates 73 on both sides are disposed toward the second fan 72 . , the narrow end formed between the inclined guide plates 73 on both sides is used as the injection port 74 . In practical applications, a concrete mixing device 8 is usually installed below the injection port 74. With the mixing of the concrete, the dispersed PVA fiber material 1 is gradually mixed into the concrete, so that the PVA fiber material 1 can be mixed in the concrete. Even distribution in concrete.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Therefore, any modification, Equivalent changes and modifications still fall within the scope of the technical solutions of the present invention.

Claims (10)

1. a PVA fiber dispersion treatment method for preparing ECC concrete, is characterized in that, comprises the steps: S10. Cleaning; spray cleaning the PVA fiber material to be processed, the PVA fiber material in the spray cleaning process needs to be completely soaked by a cleaning solution, wherein the cleaning solution includes a surfactant and a NaOH mixed solution, and the cleaning solution The temperature of the liquid is not lower than 60 ℃; S20. pre-drying; drying the cleaned PVA fiber material, wherein, before drying, the heat source output is turned off, the PVA fiber material is stirred at one level, and then the heat source output is turned on and the PVA fiber is The material is agitated in two stages, and the drying temperature of the heat source is not lower than 80°C; S30. Surface treatment; infiltrating and padding treatment are performed on the PVA fiber material in sequence. During the infiltration treatment, the PVA fiber material is sprayed and soaked with a treatment liquid, and the treatment liquid includes a first treatment agent liquid and a second treatment liquid. Treatment agent liquid, wherein the first treatment agent liquid includes polyacrylate and polyurethane aqueous emulsion, and the second treatment agent liquid includes silicone emulsion; PVA fiber material for printing and rolling; S40. Post-drying; drying the surface-treated PVA fiber material, wherein the PVA fiber material is placed flat, and the drying temperature of the heat source is not lower than 80° C.; S50. Dispersion treatment; set a fiber screen and a first fan, and make the PVA fiber material after the post-drying operation move to the fiber screen under the action of the first fan, and automatically The meshes of the fiber screen are separated and penetrated, wherein the meshes on the fiber screen are set according to dispersion requirements; S60. Collection; temporarily store and collect the dispersed PVA fibers. 2. A kind of PVA fiber dispersion treatment method for preparing ECC concrete according to claim 1 is characterized in that, in step S10, a cleaning device is provided, and a first cleaning device for conveying the PVA fiber material is provided in the cleaning device. a conveyor belt and a plurality of first spray heads for spraying the cleaning liquid; A number of the first nozzles are arranged above the first conveyor belt and arranged along the conveying direction of the first conveyor belt, and the water temperature of the cleaning liquid sprayed from the first nozzles is controlled at 80 -100°C. 3. a kind of PVA fiber dispersion treatment method for preparing ECC concrete according to claim 1 and 2, is characterized in that, between step S20 and step S10, forms a cycle treatment step, wherein, in order to carry out a continuous cleaning, a The first-stage stirring and the second-stage stirring are regarded as a single cycle of processing steps, and the number of cycles of the cycle of processing steps to be performed is selected according to the condition of the PVA fiber material. 4. a kind of PVA fiber dispersion treatment method for preparing ECC concrete according to claim 3, is characterized in that, in step S20, be provided with front drying device, in described front drying device, be provided with some stirring wheels and some first a heat lamp; The axes of a plurality of stirring wheels are arranged horizontally, and a plurality of the first heat lamps are arranged above the stirring wheels along the conveying direction of the PVA fiber material. 5. The PVA fiber dispersion treatment method for preparing ECC concrete according to claim 4, wherein the drying temperature of the first heat lamp is controlled between 100-120°C, and the single drying time is controlled Between 5-10 minutes. 6. A kind of PVA fiber dispersion treatment method for preparing ECC concrete according to any one of claims 1, 4, 5, is characterized in that, in step S30, between soaking treatment and padding treatment, a circulation treatment process is formed, Wherein, taking one continuous soaking treatment and padding treatment as a single cycle treatment process cycle, the number of cycles of the cycle treatment process cycle to be performed is selected according to the condition of the PVA fiber material. 7. A kind of PVA fiber dispersion treatment method for preparing ECC concrete according to claim 6 is characterized in that, in step S30, a surface treatment device is provided, and in the surface treatment device, along the conveying direction of the PVA fiber material Second, there are infiltration work area and padding work area; A plurality of second nozzles for spraying treatment liquid are arranged in the soaking working area, and the roller group is arranged in the padding working area. 8. a kind of PVA fiber dispersion treatment method for preparing ECC concrete according to claim 1 or 7, is characterized in that, in step S40, be provided with post-drying device, in described post-drying device, be provided with for described PVA a second conveyor belt for fibrous material transport and a number of second heat lamps; A plurality of the second heat lamps are arranged above the second conveyor belt and arranged along the conveying direction of the second conveyor belt. 9 . The method for dispersing PVA fibers for preparing ECC concrete according to claim 8 , wherein in step S50 , a dispersing treatment device is provided, and the dispersing treatment device comprises a first workbench, and along the PVA The conveying direction of the fiber material, the first fan is provided at the material input end of the first workbench, and the fiber screen is provided at the material output end of the first workbench; Several guide stirring wheels are arranged on both sides of the end face of the first workbench. 10. The method for dispersing PVA fibers for preparing ECC concrete according to claim 1 or 9, characterized in that, in step S60, a throwing device is provided, and the throwing device comprises a second workbench and a second fan, and along the conveying direction of the PVA fiber material, the second fan is arranged at the material input end of the second workbench; Two sides of the material output end of the second workbench are provided with inclined guide plates, and a throw-in port is formed between the two inclined guide plates.

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