Lightweight concrete drainage pipe

Abstract

The invention discloses a lightweight concrete drainage pipe, and belongs to the field of non-metallic material engineering. The concrete is composed of concrete and a fiber resin composite main body, the concrete is composed of the following components: Portland cement, modified volcanic ash powder, slag powder, silica fume, metakaolin, quartz sand, a water reducing agent, magnesium silicate, modified graphene, recycled aggregate and water, and the modified graphene is a concrete additive; and the fiber resin composite main body is covered with concrete. The technical effects of reducing the weight of the drainage pipe and improving the comprehensive performance of the material are achieved.

Description

Technical Field

[0001] The invention relates to the field of non-metallic material engineering, and in particular to a concrete drain pipe, especially a lightweight concrete drain pipe and a preparation method thereof. Background Art

[0002] Concrete is one of the most important civil engineering materials in contemporary times. It is an artificial stone made of cementitious materials, granular aggregates (also called aggregates), water, and admixtures and additives added when necessary, mixed in a certain proportion, and then uniformly stirred, compacted, and hardened. Concrete has the characteristics of abundant raw materials, low price, and simple production process, so its usage is increasing. At the same time, concrete also has the characteristics of high compressive strength, good durability, and a wide range of strength grades. These characteristics make it widely used. It is not only used in various civil engineering projects, but also in shipbuilding, machinery industry, marine development, geothermal engineering, etc. Concrete is also an important material.

[0003] The prior art (CN217634343U) discloses a reinforced concrete drain pipe including a drain pipe body and a connecting part, the connecting part is fixed to the bottom of the drain pipe body, the connecting part includes a connecting base, one end of the connecting base is provided with a connecting hanging plate, the other end of the connecting base is provided with a connecting rod, the outer end of the connecting rod is provided with a hook, the connecting rod and the connecting hanging plate are both slidably connected to the connecting base, the connecting hanging plate is provided with two connecting hanging holes, the connecting hanging plate is used to connect the hook, and two adjacent drain pipe bodies are detachably connected through the connecting base. After the two adjacent connecting bases are hung, it is convenient to align the drain pipe body, and it can play a good limiting role on the drain pipe body, making it difficult to roll and break, easy to operate, and can greatly improve the installation efficiency of the drain pipe.

[0004] However, in the process of implementing the technical solution in the prior art, the applicant discovered that the technical solution in the prior art had the following technical problems:

[0005] Modern concrete is made by mixing sand, gravel and cement with water and pouring the mixture into molds before it sets. Cement is made by roasting limestone (a rock composed of calcium carbonate) to remove carbon dioxide and leave behind calcium oxide. Cement is heated to 1400°C in a kiln to form "clinker". Concrete has high compressive strength.

[0006] However, existing technologies are relatively weak due to poor tensile and flexural strength. This means that concrete is prone to chipping and cracking, and this damage can easily expand and spread over time. Concrete can also scale / strip, buckle and spall. In addition, the manufacture of concrete is increasingly causing environmental problems. The chemical reaction that occurs during the formation of clinker - the conversion of limestone (or calcium carbonate, CaCo3) to calcium silicate (Ca2SiO4) - releases about 600 kg of carbon dioxide for every ton (1000 kg) of cement produced. In addition, reinforced concrete also has the problem of heavy weight, which increases transportation costs. It can be seen that concrete drain pipes generally have problems with poor tensile and flexural strength, which affect the overall material performance, as well as the problem of heavy weight. Summary of the invention

[0007] On the one hand, the technical problem to be solved by the present invention is to provide a lightweight concrete drain pipe, which solves the technical problems of heavy weight and insufficient comprehensive material performance of concrete drain pipes in the prior art, and at least achieves one of the technical effects of reducing weight and improving comprehensive material performance.

[0008] In order to solve the above technical problems, the technical solution of the present invention is:

[0009] A lightweight concrete drain pipe is composed of a concrete and fiber resin composite body, wherein the concrete comprises the following components:

[0010] Portland cement, modified volcanic rock ash powder, slag powder, silica fume, metakaolin, quartz sand, water reducing agent, magnesium silicate, modified graphene, recycled aggregate and water, wherein the modified graphene is a concrete additive; concrete covers the fiber resin composite body.

[0011] Preferably, the modified graphene includes one or more of LTDF graphene, graphene nanosheets, graphene nanoparticles, graphene oxide and reduced graphene oxide; and the material of the resin fiber composite body is glass fiber and basalt composite fiber.

[0012] More preferably, the modified graphene is LTDF graphene or graphene nanosheets, the fiber-resin composite body is in the shape of one or more of parallel fibers, mutually perpendicular fibers or interwoven fibers; and the resin-fiber composite body is made of thermosetting resin.

[0013] More preferably, the concrete comprises the following components in parts by weight:

[0014] 800-1200 parts of silicate cement, 20-40 parts of modified volcanic rock ash powder, 20-25 parts of slag powder, 80-100 parts of silica fume, 30-50 parts of metakaolin, 1800-2000 parts of quartz sand, 150-200 parts of water reducer, 2-4 parts of magnesium silicate, 1-3 parts of modified graphene, 100-200 parts of recycled aggregate and 300-350 parts of water.

[0015] Particularly preferably, the recycled aggregate is one or more of industrial waste or municipal solid waste.

[0016] Particularly preferably, the size of the modified graphene is greater than 30 um.

[0017] Particularly preferably, the size of the modified graphene is greater than 50 um.

[0018] Particularly preferably, the particle size of the recycled aggregate is 25-30 mm.

[0019] Another aspect of the present invention is to provide a method for preparing a lightweight concrete drain pipe, comprising the following steps:

[0020] (S1) Mixing raw materials: adding weighed silicate cement, modified volcanic rock ash powder, slag powder, silica fume, metakaolin, quartz sand, water reducing agent, magnesium silicate, recycled aggregate and water into a concrete mixer, and stirring for 40 to 60 seconds to obtain a preliminary mixture;

[0021] (S2) adding a water reducer: the weighed water is divided into two halves, the water reducer is added to one half of the water, and the water containing the water reducer is poured into the preliminary mixture of (S1) and stirred for 40 to 50 seconds to obtain an intermediate mixture;

[0022] (S3) adding the remaining half of the water to the mixture obtained in (S2) and stirring for 60-80 seconds, adding the modified graphene and stirring for another 60-70 seconds to obtain volcanic ash concrete;

[0023] (S4) Mold forming: concrete is poured into a resin fiber composite main body mold of a preset shape to form a drainage pipe.

[0024] One or more technical solutions provided by this application have at least the following technical effects or advantages:

[0025] The above technical solution adopts a series of technical means such as a drainage pipe composed of a concrete and fiber resin composite body combined with modified volcanic rock ash powder and modified graphene as raw materials. The fiber resin composite body provides structural support to replace the metal structural skeleton to increase elasticity and compressive strength, and reduce the amount of concrete used. In addition, volcanic ash contains a large amount of SiO2 and Al2O3, which reacts chemically with alkaline substances such as Ca(OH)2 in a humid environment to generate gelling substances such as hydrated silica gel, which strengthens the concrete and blocks the capillary structure in the concrete, thereby improving the corrosion resistance of the concrete. At the same time, the use of modified graphene further enhances the material properties of the drainage pipe material. The strength of graphene-enhanced concrete is 2.5 times that of standard concrete, and the water permeability is 4 times that of standard concrete. Less cement can be used to achieve the same strength. It effectively solves the technical problems of heavy weight and insufficient comprehensive material performance of concrete water pipes in the prior art, thereby achieving the technical effect of reducing the weight of the drainage pipe and improving the comprehensive material performance. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention are further described below. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] Concrete drainage pipes are common drainage pipes in road and bridge projects. However, concrete is heavy and has poor tensile and bending strength, resulting in high transportation costs and poor durability.

[0028] The technical solution of the implementation mode of the present application solves the problems of heavy weight and insufficient comprehensive material performance of concrete drain pipes in the prior art by providing a lightweight concrete drain pipe. The drain pipe composed of a concrete and fiber resin composite body is combined with modified volcanic rock ash powder and modified graphene as raw materials to achieve the beneficial effects of reducing the weight of the drain pipe and improving the comprehensive material performance.

[0029] The overall idea of ​​the implementation scheme of the present invention to solve the above technical problems is as follows:

[0030] A lightweight concrete drain pipe is composed of a concrete and fiber resin composite body, wherein the concrete comprises the following components:

[0031] Portland cement, modified volcanic rock ash powder, slag powder, silica fume, metakaolin, quartz sand, water reducing agent, magnesium silicate, modified graphene, recycled aggregate and water, wherein the modified graphene is a concrete additive; concrete covers the fiber resin composite body.

[0032] Specifically, a lightweight concrete drain pipe is composed of a concrete and fiber resin composite body, and the concrete includes the following components:

[0033] 800-1200 parts of silicate cement, 20-40 parts of modified volcanic rock ash powder, 20-25 parts of slag powder, 80-100 parts of silica fume, 30-50 parts of metakaolin, 1800-2000 parts of quartz sand, 150-20 parts of water reducer, 2-4 parts of magnesium silicate, 1-3 parts of modified graphene, 100-200 parts of recycled aggregate and 300-350 parts of water.

[0034] The fiber-resin composite body provides structural support to replace the metal structural skeleton to increase elasticity and compressive strength, and reduce the amount of concrete used. In addition, volcanic ash contains a large amount of SiO2 and Al2O3, which reacts chemically with alkaline substances such as Ca(OH)2 in a humid environment to produce gelling substances such as hydrated silica gel, which strengthens the concrete and blocks the capillary structure in the concrete, improving the corrosion resistance of the concrete. At the same time, the use of modified graphene further enhances the material properties of the drainage pipe material. The strength of graphene-enhanced concrete is 2.5 times that of standard concrete, and the water permeability is 4 times that of standard concrete. Less cement can be used to achieve the same strength.

[0035] In addition, by using recycled aggregates, solid waste can be recycled, which is in line with the concept of environmental protection.

[0036] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with specific implementation methods.

[0037] Example 1

[0038] A lightweight concrete drain pipe is composed of a concrete and fiber resin composite body, 800 parts of silicate cement, 20 parts of modified volcanic rock ash powder, 20 parts of slag powder, 80 parts of silica ash, 30 parts of metakaolin, 1800 parts of quartz sand, 150 parts of water reducer, 2 parts of magnesium silicate, 1 part of modified graphene, 100 parts of recycled aggregate and 300 parts of water.

[0039] Specifically, the modified graphene includes LTDF graphene, graphene nanosheets, graphene nanoparticles, graphene oxide and reduced graphene oxide.

[0040] More specifically, the resin-fiber composite body adopts a thermosetting resin.

[0041] In particular, the fiber-resin composite body is in the shape of 3D interwoven fibers.

[0042] Particularly specifically, the recycled aggregate is industrial waste.

[0043] The preparation method of the lightweight concrete drain pipe of this embodiment comprises the following steps:

[0044] (S1) Mixing raw materials: adding weighed silicate cement, modified volcanic rock ash powder, slag powder, silica fume, metakaolin, quartz sand, water reducing agent, magnesium silicate, recycled aggregate and water into a concrete mixer, and stirring for 40 to 60 seconds to obtain a preliminary mixture;

[0045] (S2) adding a water reducer: the weighed water is divided into two halves, the water reducer is added to one half of the water, and the water containing the water reducer is poured into the preliminary mixture of (S1) and stirred for 40 to 50 seconds to obtain an intermediate mixture;

[0046] (S3) adding the remaining half of the water to the mixture obtained in (S2) and stirring for 60-80 seconds, adding the modified graphene and stirring for another 60-70 seconds to obtain volcanic ash concrete;

[0047] (S4) Mold forming: concrete is poured into a resin fiber composite main body mold of a preset shape to form a drainage pipe.

[0048] Example 2

[0049] A lightweight concrete drain pipe is composed of a concrete and fiber resin composite body, 1000 parts of silicate cement, 30 parts of modified volcanic rock ash powder, 23 parts of slag powder, 90 parts of silica ash, 40 parts of metakaolin, 1900 parts of quartz sand, 180 parts of water reducer, 3 parts of magnesium silicate, 2 parts of modified graphene, 150 parts of recycled aggregate and 330 parts of water.

[0050] Specifically, the modified graphene is LTDF graphene, and the size of the modified graphene is greater than 30um.

[0051] More specifically, the resin-fiber composite body adopts a thermosetting resin.

[0052] In particular, the fiber resin composite body is in the shape of vertically interwoven fibers.

[0053] Particularly specifically, the recycled aggregate is industrial waste and municipal solid waste.

[0054] The preparation method of this embodiment is the same as that of embodiment 1.

[0055] Example 3

[0056] A lightweight concrete drain pipe is composed of a concrete and fiber resin composite body, 1200 parts of silicate cement, 40 parts of modified volcanic rock ash powder, 25 parts of slag powder, 100 parts of silica ash, 50 parts of metakaolin, 2000 parts of quartz sand, 200 parts of water reducer, 4 parts of magnesium silicate, 3 parts of modified graphene, 200 parts of recycled aggregate and 350 parts of water.

[0057] Specifically, the modified graphene is LTDF graphene, and the size of the modified graphene is greater than 50um.

[0058] More specifically, the resin-fiber composite body adopts a thermosetting resin.

[0059] In particular, the fiber resin composite body is in the shape of vertically interwoven fibers.

[0060] Particularly specifically, the recycled aggregate is municipal solid waste.

[0061] The preparation method of this embodiment is the same as that of embodiment 1.

[0062] Comparative Example 1

[0063] The modified graphene uses graphene nanosheets, and the rest follows the method of Example 2.

[0064] Comparative Example 2

[0065] The modified graphene uses graphene nanosheets, and the rest follows the method of Example 2.

[0066] Comparative Example 3

[0067] The modified graphene uses graphene nanosheets, and the rest follows the method of Example 2.

[0068] Comparative Example 4

[0069] The modified graphene is graphene oxide, and the rest is the same as in Example 2.

[0070] Comparative Example 5

[0071] The modified graphene is reduced graphene oxide, and the rest follows the method of Example 2.

[0072] The above volcanic ash is from the volcanic geology in Enping, Guangdong.

[0073] The compressive strength of graphene-enhanced concrete increased by 146%, the flexural strength increased by 79.5%, and the maximum displacement caused by compressive load was reduced by 78%. Nanographite flakes (GNPs) can increase the tensile strength and flexural strength of ultra-high performance concrete (UHPC) by 40-45% and 39-59%. Graphene-enhanced concrete can reduce the amount of concrete required by about 25-35%, which helps reduce carbon dioxide emissions. Combined with a fiber-resin composite body, it helps to further reduce the amount of concrete used.

[0074] LTDF graphene outperforms graphene nanosheets, graphene nanoparticles, graphene oxide, and reduced graphene oxide because the large flake size reduces the amount of graphene required and the risk of agglomeration while imparting excellent tensile and flexural strength. Avadain's LTDF graphene flakes are preferred, as they have a large surface area and are hydrophobic. Avadain's LTDF graphene flakes have a tensile strength of 1034213Mpa, which is 200 times stronger than steel. In addition, this material has a complete combination of graphene properties and a range of bends, and is more than a million times thinner than a piece of paper. A 1g sheet of Avadain's LTDF graphene flakes is enough to cover a football field.

[0075] Oyster shell powder is added to the LTDF graphene. Since the oyster shell powder is more solid when it gets wet, the comprehensive material performance of the drainage pipe can be further improved.

[0076] The embodiments of the present invention are described in detail above, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the protection scope of the present invention.

Claims

1. A lightweight concrete drain pipe, characterized in that: It is composed of a concrete and fiber resin composite body, wherein the concrete includes the following components: Portland cement, modified volcanic rock ash powder, slag powder, silica fume, metakaolin, quartz sand, water reducing agent, magnesium silicate, modified graphene, recycled aggregate and water, wherein the modified graphene is a concrete additive; concrete covers the fiber resin composite body.

2. The lightweight concrete drain pipe according to claim 1, characterized in that: The modified graphene includes one or more of LTDF graphene, graphene nanosheets, graphene nanoparticles, graphene oxide and reduced graphene oxide; the material of the resin fiber composite body is glass fiber and basalt composite fiber.

3. The lightweight concrete drain pipe according to claim 1, characterized in that: The modified graphene is LTDF graphene or graphene nanosheets, the fiber-resin composite body is in the shape of one or more of parallel fibers, mutually perpendicular fibers or interwoven fibers; and the resin-fiber composite body is made of thermosetting resin.

4. The lightweight concrete drain pipe according to claim 1, characterized in that: The concrete comprises the following components in parts by weight: 800-1200 parts of silicate cement, 20-40 parts of modified volcanic rock ash powder, 20-25 parts of slag powder, 80-100 parts of silica fume, 30-50 parts of metakaolin, 1800-2000 parts of quartz sand, 150-200 parts of water reducer, 2-4 parts of magnesium silicate, 1-3 parts of modified graphene, 100-200 parts of recycled aggregate and 300-350 parts of water.

5. The lightweight concrete drain pipe according to claim 1, characterized in that: The recycled aggregate is one or more of industrial waste or urban solid waste.

6. The lightweight concrete drain pipe according to claim 1, characterized in that: The size of the modified graphene is greater than 30um.

7. The lightweight concrete drain pipe according to claim 1, characterized in that: The size of the modified graphene is greater than 50um.

8. The lightweight concrete drain pipe according to claim 1, characterized in that: The particle size of the recycled aggregate is 25-30 mm.

9. A method for preparing a lightweight concrete drain pipe according to any one of claims 1 to 8, characterized in that: The following steps are involved: (S1) Mixing raw materials: adding weighed silicate cement, modified volcanic rock ash powder, slag powder, silica fume, metakaolin, quartz sand, water reducing agent, magnesium silicate, recycled aggregate and water into a concrete mixer, and stirring for 40 to 60 seconds to obtain a preliminary mixture; (S2) adding a water reducer: the weighed water is divided into two halves, the water reducer is added to one half of the water, and the water containing the water reducer is poured into the preliminary mixture of (S1) and stirred for 40 to 50 seconds to obtain an intermediate mixture; (S3) adding the remaining half of the water to the mixture obtained in (S2) and stirring for 60-80 seconds, adding the modified graphene and stirring for another 60-70 seconds to obtain volcanic ash concrete; (S4) Mold forming: concrete is poured into a resin fiber composite main body mold of a preset shape to form a drainage pipe.