Production process for producing pervious concrete by using conventional stirrer

Abstract

The invention discloses a production process for producing pervious concrete by using a conventional stirrer, which sequentially comprises the following steps: weighing various raw materials of the pervious concrete in parts by mass, putting the raw materials into the conventional stirrer, and stirring until coarse aggregate in the raw materials wraps slurry; the opening degree of an outlet of the conventional stirrer is controlled to be smaller than 1 / 2, and the stirred pervious concrete is slowly released from the conventional stirrer and put into an open type loading tool. Pervious concrete can be produced on the premise that a conventional stirring machine is not subjected to equipment transformation, the production efficiency is improved, the equipment occupation condition is reduced, rapid conversion between two production tasks of pervious concrete and common concrete can be achieved, the production rhythm is accelerated, the production range of the conventional stirring machine is expanded, and the production cost is reduced. And the cost generated by dismounting and mounting the discharging hopper of the conventional stirrer is reduced, and good economic benefits are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete production, and in particular to a production process for producing permeable concrete by using a conventional mixer. Background Art

[0002] In recent years, with increasing attention paid to sponge city construction, permeable concrete pavement can replenish groundwater, alleviate urban waterlogging, absorb sound and reduce noise, improve urban thermal environment, and has good environmental and social benefits. It is an important material for advocating energy-saving, environmentally friendly and green buildings.

[0003] Although there are mixers specifically used for producing permeable concrete in the prior art, such as a concrete mixer for permeable concrete construction disclosed in Chinese patent CN114888964B, and there are also devices for improving mixer feeding, such as a mixer permeable concrete feeding auxiliary device disclosed in Chinese patent CN 208263181U. If the device disclosed in the above patent is used, the production cost of permeable concrete will be greatly increased. Usually, a mixer for producing conventional concrete is used to produce permeable concrete. The mixer for producing conventional concrete is provided with a conical feeding hopper at the bottom to load the mixed concrete into the mixer truck. The feeding hopper requires the concrete to have a certain slump, otherwise it will be blocked. Pervious concrete is a type of concrete with no slump. When producing pervious concrete in a conventional mixer, the lower hopper must be removed first, and then the earth-moving truck is poured under the mixer. The pervious concrete directly enters the bucket of the earth-moving truck through the outlet of the mixer for loading. This method is suitable for large-scale centralized production of pervious concrete. However, pervious concrete is currently used on a small scale and scattered, with the production volume of only a few dozen cubic meters each time. Therefore, this method has the problems of occupying equipment, being unable to quickly convert between the two production tasks of pervious concrete and ordinary concrete, and having low production efficiency. At the same time, there are safety hazards in the process of removing and installing the lower hopper. Summary of the invention

[0004] In view of the defects existing in the prior art, the present application provides a production process for producing permeable concrete using a conventional mixer to solve the problems raised by the above background technology.

[0005] In order to achieve the purpose of the above invention, the technical solution provided by the present invention is as follows:

[0006] A production process for producing permeable concrete using a conventional mixer comprises the following steps:

[0007] S1. Weigh various raw materials of permeable concrete by mass, put the raw materials into a conventional mixer and stir until the coarse aggregates in the raw materials are all covered with slurry;

[0008] S2. Control the opening of the outlet of the conventional mixer to be less than 1 / 2, so that the mixed permeable concrete is slowly released from the conventional mixer and placed in an open loading tool.

[0009] In one embodiment, the step S1 specifically further comprises:

[0010] S101, add 1300-1700 parts of coarse aggregate and 50-70 parts of water into a conventional mixer by mass, and pre-mix for 1-2 minutes in the conventional mixer;

[0011] S102. Add 360-400 parts of cement, 50-70 parts of water and 6-8 parts of admixture into a conventional mixer by mass, and stir with the conventional mixer until the surface of the coarse aggregate is glossy.

[0012] In one embodiment, the coarse aggregate is natural crushed stone with a diameter of 5-16 mm, the cement is P.O42.5 cement, and the admixture is a latex-type admixture.

[0013] In one embodiment, the latex admixture is a milky white liquid admixture with a density of 1.030-1.050 kg / m3 and a pH of 8-10.

[0014] In one embodiment, the opening degree of the conventional mixer outlet in S2 is 1 / 3.

[0015] In one embodiment, the open loading tool in S2 includes a bucket truck and an earth-moving vehicle, and placing the permeable concrete into the open loading tool specifically includes first placing the permeable concrete into the bucket of the bucket truck, and then transferring the permeable concrete to the bucket of the earth-moving vehicle by the bucket truck.

[0016] In one embodiment, the method further includes S3: when producing 3-5 cubic meters of permeable concrete, closing the outlet of the conventional mixer, flushing the lower hopper of the conventional mixer, and after completing the flushing of the lower hopper, restoring the opening of the outlet of the conventional mixer to continue releasing permeable concrete from the conventional mixer.

[0017] Compared with the prior art, this application has at least the following beneficial effects:

[0018] The permeable concrete production process that can be produced by a conventional mixer in the present invention can produce permeable concrete without modifying the conventional mixer, thereby improving production efficiency, reducing equipment occupancy, and realizing rapid conversion between the two production tasks of permeable concrete and ordinary concrete. The permeable concrete and ordinary concrete can be produced at the same time, thereby accelerating the production rhythm and expanding the production range of conventional mixers.

[0019] The permeable concrete production process of the present invention can avoid the process of dismantling and installing the lower hopper, thereby avoiding the potential safety hazards in the process, while reducing the cost of dismantling and installing the lower hopper, and has good economic benefits;

[0020] The latex admixture used in the present application is a milky white liquid admixture, which can significantly improve the bonding strength between coarse aggregates of permeable concrete, and can improve the permeability effect of permeable concrete while ensuring its strength. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by specific embodiments. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0022] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0023] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms and should not be understood as indicating or implying relative importance. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0024] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0025] In order to better understand the technical solution of the present invention, the present invention is described in detail below.

[0026] The present invention provides a production process for producing permeable concrete using a conventional mixer, comprising the following steps:

[0027] S1. Weigh various raw materials of permeable concrete by mass, put the raw materials into a conventional mixer and stir until the coarse aggregates in the raw materials are all covered with slurry;

[0028] S2. Control the opening of the outlet of the conventional mixer to be less than 1 / 2, so that the mixed permeable concrete is slowly released from the conventional mixer and placed in an open loading tool.

[0029] Wherein, step S1 specifically further comprises: S101, adding 1300-1700 parts of coarse aggregate and 50-70 parts of water into a conventional mixer by mass, and pre-mixing the mixture for 1-2 minutes in the conventional mixer;

[0030] S102. Add 360-400 parts of cement, 50-70 parts of water and 6-8 parts of admixture into a conventional mixer by mass, and stir with the conventional mixer until the surface of the coarse aggregate is glossy.

[0031] The coarse aggregate is natural crushed stone with a diameter of 5-16mm to improve the environmental protection of permeable concrete production. The cement is P.O42.5 cement and the admixture is latex admixture. The latex admixture is a milky white liquid admixture with a density of 1.030-1.050kg / m3 and a pH of 8-10 to improve the bonding strength between the coarse aggregates of the permeable concrete and improve its permeability effect while ensuring the strength of the permeable concrete.

[0032] In order to completely prevent the "bridging" phenomenon of permeable concrete with no slump at the outlet of the permeable mixer, which causes the permeable concrete to be blocked at the outlet of the machine, the opening of the conventional mixer outlet in S2 is 1 / 3 to maintain a low flow rate of the permeable concrete between the outlet and the lower hopper outlet, and to avoid the permeable concrete supporting each other during the flow to form an arch that prevents the permeable concrete from flowing.

[0033] The open loading tool in S2 includes a bucket truck and an earth-moving vehicle. Placing the permeable concrete into the open loading tool specifically includes first placing the permeable concrete into the bucket of the bucket truck, and then transferring the permeable concrete to the bucket of the earth-moving vehicle by the bucket truck.

[0034] The production process of producing permeable concrete using a conventional mixer also includes S3: when producing 3-5 cubic meters of permeable concrete, closing the outlet of the conventional mixer and flushing the lower hopper of the conventional mixer to prevent excessive permeable concrete from sticking to the hopper wall of the lower hopper, increasing the viscosity of the hopper wall of the lower hopper, and increasing the risk of clogging of the permeable concrete at the outlet of the lower hopper. After completing the flushing of the lower hopper, the opening of the conventional mixer outlet is restored to continue releasing permeable concrete from the conventional mixer.

[0035] In order to better understand the scheme of the present invention, the following group of embodiments and a group of comparative examples are provided for illustration:

[0036] Example:

[0037] S1. Weigh 1500 parts of coarse aggregate and 70 parts of water by mass and put them directly into a conventional mixer and pre-mix for 1 minute to fully wet the coarse aggregate;

[0038] S2. Weigh 400 parts of cement, 70 parts of water, and 8 parts of latex admixture by mass and put them into a mixer and stir until the gravel is almost completely covered with the slurry, and the final state is that the surface is glossy;

[0039] S3, slowly releasing the mixed permeable concrete from the mixer and putting it into the bucket of the loader, and then transferring it to the bucket of the dump truck by the loader;

[0040] S4. During the production process of permeable concrete, every time 4 cubic meters are produced, the wall of the mixer hopper should be flushed according to the actual situation and then the production of permeable concrete should continue until the production is completed.

[0041] Comparative Example:

[0042] S1. First, transform the mechanical equipment, dismantle the lower hopper of the mixer, and then use a forklift to move the dismantled lower hopper to an open space for temporary storage. The dump truck is poured under the mixer with the dismantled lower hopper to start the production of permeable concrete.

[0043] S2. Weigh 1500 parts of coarse aggregate and 70 parts of water by mass and put them directly into a mixer and pre-mix for 1 minute to fully wet the coarse aggregate;

[0044] S3. Weigh 400 parts of cement, 70 parts of water, and 8 parts of latex admixture by mass and put them into a mixer and stir until the gravel is almost completely covered with the slurry, and the final state is that the surface is glossy;

[0045] S4. After the production of permeable concrete is completed, the mixer hopper is returned to its original position, and then the production of ordinary concrete is carried out.

[0046] The examples and comparative examples were subjected to strength testing and production process comparison in accordance with GB / T 50081-2019 "Standard for Test Methods for Physical and Mechanical Properties of Concrete".

[0047] Group Compressive strength / MPa <![CDATA[Production time (calculated based on 10m 3 count)]]> Equipment transformation time Example 24.0 30min none Comparative Example 24.4 15min At least 4 hours

[0048] Through the performance test, it can be seen that the compressive strength of the embodiment and the comparative example is basically the same, because the front-end production process is basically the same, the only difference is the different charging method, which also leads to the same production of 10m 3In the case of permeable concrete, due to the steps of material transfer by forklift and cleaning of lower hopper, the embodiment takes twice as long as the comparative example. However, compared with the comparative example, the embodiment does not require equipment transformation time, which greatly reduces the cost of equipment transformation and the potential safety hazards during the transformation process. At the same time, the production tasks of permeable concrete and ordinary concrete can be freely switched, the production arrangement is more flexible, and there is no equipment occupancy, which is extremely beneficial for ordinary mixing stations.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A production process for producing permeable concrete using a conventional mixer, characterized in that: The following steps are involved: S1. Weigh various raw materials of permeable concrete by mass, put the raw materials into a conventional mixer and stir until the coarse aggregates in the raw materials are all covered with slurry; S2. Control the opening of the outlet of the conventional mixer to be less than 1 / 2, so that the mixed permeable concrete is slowly released from the conventional mixer and placed in an open loading tool.

2. The production process for producing permeable concrete using a conventional mixer according to claim 1, characterized in that: The step S1 specifically includes: S101, add 1300-1700 parts of coarse aggregate and 50-70 parts of water into a conventional mixer by mass, and pre-mix for 1-2 minutes in the conventional mixer; S102. Add 360-400 parts of cement, 50-70 parts of water and 6-8 parts of admixture into a conventional mixer by mass, and stir with the conventional mixer until the surface of the coarse aggregate is glossy.

3. The production process for producing permeable concrete using a conventional mixer according to claim 2, characterized in that: The coarse aggregate is natural crushed stone with a diameter of 5-16 mm, the cement is P.O42.5 cement, and the admixture is a latex-type admixture.

4. The production process for producing permeable concrete using a conventional mixer according to claim 3, characterized in that: Latex type admixture is a milky white liquid admixture with a density grade of 1.030-1.050 kg / m3 and a pH value of 8-10.

5. The production process for producing permeable concrete using a conventional mixer according to claim 1, characterized in that: The opening degree of the conventional mixer outlet in S2 is 1 / 3.

6. The production process for producing permeable concrete using a conventional mixer according to claim 1, characterized in that: The open loading tool in S2 includes a bucket truck and an earth-moving vehicle. Placing the permeable concrete into the open loading tool specifically includes firstly placing the permeable concrete into the bucket of the bucket truck, and then transferring the permeable concrete into the bucket of the earth-moving vehicle by the bucket truck.

7. The production process for producing permeable concrete using a conventional mixer according to claim 1, characterized in that: It also includes S3: when producing 3-5 cubic meters of permeable concrete, closing the outlet of the conventional mixer, flushing the lower hopper of the conventional mixer, and after completing the flushing of the lower hopper, restoring the opening of the outlet of the conventional mixer to continue releasing the permeable concrete from the conventional mixer.