阅读说明：本技术 一种高延展性高强度混凝土的制备方法 (Preparation method of high-ductility and high-strength concrete ) 是由 吴�荣 周锋 邱继承 郑斌 于 2021-06-23 设计创作，主要内容包括：本发明公开了一种高延展性高强度混凝土的制备方法,属于混凝土加工技术领域,包括以下步骤：S1、预制原材料的搅拌；S2、混凝土初始料的制备；S3、静置；S4、絮凝；S5、装模,其中,通过本发明的一种高延展性高强度混凝土的制备方法制备得到的高延展性高强度的混凝土具有重量轻、强度高、耐候性好的特点,能够满足建筑业对混凝土性能指标要求,具有较好的应用前景,同时,本发明采用水泥、细砂和硅藻土复合作为骨料,提高混凝土的内部孔隙率,显著降低混凝土的弹性,同时降低混凝土的堆积密度和质量密度,具有轻质化的特点,通过加入增强纤维和氧化石墨烯,能够显著提高混凝土的抗裂性能和强度,聚合氯化铝能够提高混凝土的强度。(The invention discloses a preparation method of high-ductility and high-strength concrete, belonging to the technical field of concrete processing and comprising the following steps: s1, stirring the prefabricated raw materials; s2, preparing a concrete initial material; s3, standing; s4, flocculation; s5, filling the concrete into a mold, wherein the high-ductility and high-strength concrete prepared by the preparation method of the high-ductility and high-strength concrete has the characteristics of light weight, high strength and good weather resistance, can meet the requirements of the construction industry on the performance indexes of the concrete, and has a good application prospect.)

1. A preparation method of high-ductility and high-strength concrete is characterized by comprising the following steps: the method comprises the following steps:

s1, stirring prefabricated raw materials, namely stirring 20-40 parts by weight of cement, 20-35 parts by weight of fine sand, 3-13 parts by weight of diatomite, 1-12 parts by weight of light calcium carbonate, 5-9 parts by weight of polyaluminium chloride, 15-28 parts by weight of lightweight aggregate, 1-3 parts by weight of reinforcing fiber and 1-3 parts by weight of graphene oxide to obtain a mixture;

s2, preparing a concrete initial material, namely adding 1.5-3.5 parts by weight of a water reducing agent and 2-5 parts by weight of other auxiliary agents into the concrete initial material in the step S1, adding powder after the water reducing agent and the other auxiliary agents are uniformly dispersed in the water, continuously stirring for 50-120S to obtain mixed slurry, and finally adding 1-3 parts by weight of a foaming agent into the mixture to obtain the concrete initial material;

s3, standing, namely, placing the initial concrete material prepared in the step S2 in a container for standing for 10S-20S;

s4, flocculating, namely adding 3-7 parts by weight of flocculating agent into the concrete initial material after standing in the step S3 to flocculate the concrete initial material;

s5, filling a mold, namely putting the flocculated concrete initial material in the step S4 into the mold, then adding 1-5 parts by weight of foaming agent into the mold, sealing the mold, airing for 2-5 hours, and then removing the mold to obtain the concrete with high ductility and high strength.

2. The method for preparing high-ductility and high-strength concrete according to claim 1, wherein the method comprises the following steps: the light aggregate is any one of clay, ceramsite, pumice, polyethylene foam plastic and wood chips.

3. The method for preparing high-ductility and high-strength concrete according to claim 1, wherein the method comprises the following steps: the particle size of the lightweight aggregate is 2-8 mm.

4. The method for preparing high-ductility and high-strength concrete according to claim 1, wherein the method comprises the following steps: the reinforced fiber is any one of polypropylene fiber, polyhexamethylene adipamide fiber, glass fiber and plant fiber.

5. The method for preparing high-ductility and high-strength concrete according to claim 1, wherein the method comprises the following steps: the foaming agent is any one or more of aluminum powder, magnesium powder, zinc powder, hydrogen peroxide and rosin soap.

6. The method for preparing high-ductility and high-strength concrete according to claim 1, wherein the method comprises the following steps: the water reducing agent is any one of an FDN type water reducing agent, a UNF-2 type water reducing agent, an AF type water reducing agent, an S type water reducing agent and an MF type water reducing agent.

7. The method for preparing high-ductility and high-strength concrete according to claim 1, wherein the method comprises the following steps: the other auxiliary agents are any one or more of a self-stabilizing agent, a water-retaining agent, an early strength agent and a retarder.

8. The method for preparing high-ductility and high-strength concrete according to claim 7, wherein the method comprises the following steps: the foam stabilizer is any one of sodium dodecyl benzene sulfonate, polyacrylamide and sodium stearate.

9. The method for preparing high-ductility and high-strength concrete according to claim 7, wherein the method comprises the following steps: the water retaining agent is any one of hydroxypropyl methyl cellulose ether or hydroxyethyl methyl enhanced cellulose ether.

10. The method for preparing high-ductility and high-strength concrete according to claim 1, wherein the method comprises the following steps: in step S3, the container is made of any one of glass and stainless steel.

Technical Field

The invention relates to the technical field of concrete preparation, in particular to a preparation method of high-ductility and high-strength concrete.

Background

The concrete is a building material which is widely applied in modern times, and has the advantages of rich raw materials, low price, simple process, high strength, good durability and the like.

The regenerated concrete is prepared by crushing, cleaning and grading waste concrete blocks, mixing the crushed, cleaned and graded waste concrete blocks with a grading agent according to a certain proportion, partially or completely replacing natural aggregates such as sand stones and the like, and adding cement, water and the like.

However, in the process of crushing the waste concrete blocks, due to the action of mechanical external force, a large number of fine cracks are easy to appear in the concrete blocks, so that the porosity of the concrete blocks is increased, and the prepared recycled concrete has poor compactness and poor strength.

Therefore, a new method for preparing high-ductility and high-strength concrete is needed to solve the above technical problems.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide a preparation method of high-ductility and high-strength concrete, and in order to solve the technical problem, the basic concept of the technical scheme adopted by the invention is as follows: the preparation method of the high-ductility and high-strength concrete comprises the following steps: s1, stirring prefabricated raw materials, namely stirring 20-40 parts by weight of cement, 20-35 parts by weight of fine sand, 3-13 parts by weight of diatomite, 1-12 parts by weight of light calcium carbonate, 5-9 parts by weight of polyaluminium chloride, 15-28 parts by weight of lightweight aggregate, 1-3 parts by weight of reinforcing fiber and 1-3 parts by weight of graphene oxide to obtain a mixture; s2, preparing a concrete initial material, namely adding 1.5-3.5 parts by weight of a water reducing agent and 2-5 parts by weight of other auxiliary agents in the step S1, adding powder after the water reducing agent and the other auxiliary agents are uniformly dispersed in the water, continuously stirring for 50-120S to obtain mixed slurry, and finally adding 1-3 parts by weight of a foaming agent into the mixture to obtain the concrete initial material; s3, standing, namely, placing the initial concrete material prepared in the step S2 in a container for standing for 10S-20S; s4, flocculating, namely adding 3-7 parts by weight of flocculating agent into the concrete initial material after standing in the step S3 to flocculate the concrete initial material; s5, filling a mold, namely putting the flocculated concrete initial material in the step S4 into the mold, then adding 1-5 parts by weight of foaming agent into the mold, sealing the mold, airing for 2-5 hours, and then removing the mold to obtain the concrete with high ductility and high strength.

In order to greatly improve the adhesion performance of the lightweight aggregate, the lightweight aggregate is preferably any one of clay, ceramsite, pumice, polyethylene foam plastic and wood dust.

In order to greatly improve the mixing and connecting ability of the lightweight aggregate, it is preferable that the particle size of the lightweight aggregate is 2 to 8mm as a method for preparing the high-ductility, high-strength concrete of the present invention.

In order to greatly improve the impact resistance of the reinforcing fiber, the reinforcing fiber is preferably any one of polypropylene fiber, polyhexamethylene adipamide fiber, glass fiber and plant fiber.

In order to greatly improve the foaming performance of the foaming agent, the foaming agent is preferably any one or more of aluminum powder, magnesium powder, zinc powder, hydrogen peroxide and rosin soap.

In order to greatly improve the water-reducing agent adsorption performance on water, the water-reducing agent is preferably any one of an FDN type water-reducing agent, a UNF-2 type water-reducing agent, an AF type water-reducing agent, an S type water-reducing agent and an MF type water-reducing agent.

In order to greatly improve the stability of other additives, it is preferable as a method for preparing the high-ductility high-strength concrete of the present invention that the other additives are any one or more of a self-stabilizer, a water-retaining agent, an early strength agent and a retarder.

In order to greatly improve the liquid adhesion performance of the foam stabilizer, the foam stabilizer is preferably any one of sodium dodecyl benzene sulfonate, polyacrylamide and sodium stearate.

In order to greatly improve the hydrophobicity of the water retaining agent, the water retaining agent is preferably any one of hydroxypropyl methyl cellulose ether or hydroxyethyl methyl enhanced cellulose ether.

In order to greatly improve the capacity of the container for holding the initial concrete material, it is preferable that the container is made of any one of glass and stainless steel in step S3.

After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects.

The invention provides a preparation method of high-ductility and high-strength concrete, which comprises the following steps: s1, stirring the prefabricated raw materials; s2, preparing a concrete initial material; s3, standing; s4, flocculation; s5, filling the mould, wherein the high-ductility and high-strength concrete prepared by the preparation method of the high-ductility and high-strength concrete has the characteristics of light weight, high strength and good weather resistance, can meet the requirements of the building industry on the performance indexes of the concrete, has good application prospect, meanwhile, the invention adopts the compound action of cement, fine sand and diatomite as the aggregate, improves the internal porosity of the concrete, obviously reduces the elasticity of the concrete, meanwhile, the bulk density and the mass density of the concrete are reduced, the lightweight concrete has the characteristic of light weight, the anti-cracking performance and the strength of the concrete can be obviously improved by adding the reinforced fiber and the graphene oxide, the strength of the concrete can be improved by the polyaluminium chloride, the invention can be widely applied to building maintenance structures and horizontal weighing structures, and the raw material components of the invention are mostly industrial waste materials, thus reducing the pollution of industrial waste to the environment.

Drawings

FIG. 1 is a schematic flow chart of a method for preparing high-ductility and high-strength concrete according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1, the present invention provides a technical solution: a preparation method of high-ductility and high-strength concrete comprises the following steps: s1, stirring prefabricated raw materials, namely stirring 20-40 parts by weight of cement, 20-35 parts by weight of fine sand, 3-13 parts by weight of diatomite, 1-12 parts by weight of light calcium carbonate, 5-9 parts by weight of polyaluminium chloride, 15-28 parts by weight of lightweight aggregate, 1-3 parts by weight of reinforcing fiber and 1-3 parts by weight of graphene oxide to obtain a mixture; s2, preparing a concrete initial material, namely adding 1.5-3.5 parts by weight of a water reducing agent and 2-5 parts by weight of other auxiliary agents in the step S1, uniformly dispersing in water, adding powder, continuously stirring for 50-120S to obtain mixed slurry, and finally adding 1-3 parts by weight of a foaming agent into the mixture to obtain the concrete initial material; s3, standing, namely, placing the initial concrete material prepared in the step S2 in a container for standing for 10S-20S; s4, flocculating, namely adding 3-7 parts by weight of flocculating agent into the concrete initial material after standing in the step S3 to flocculate the concrete initial material; s5, filling a mold, namely putting the flocculated concrete initial material in the step S4 into the mold, then adding 1-5 parts by weight of foaming agent into the mold, sealing the mold, airing for 2-5 hours, and then removing the mold to obtain the concrete with high ductility and high strength.

Example 1 of step S1: 20 parts by weight of cement, 20 parts by weight of fine sand, 3 parts by weight of diatomite, 1 part by weight of light calcium carbonate, 5 parts by weight of polyaluminium chloride, 15 parts by weight of lightweight aggregate, 1 part by weight of reinforcing fiber and 1 part by weight of graphene oxide are stirred to obtain a mixture.

Example 2 of step S1: 40 parts by weight of cement, 35 parts by weight of fine sand, 13 parts by weight of diatomite, 12 parts by weight of light calcium carbonate, 9 parts by weight of polyaluminum chloride, 28 parts by weight of lightweight aggregate, 3 parts by weight of reinforcing fiber and 3 parts by weight of graphene oxide are stirred to obtain a mixture.

Example 3 of step S1: 30 parts by weight of cement, 29 parts by weight of fine sand, 10 parts by weight of diatomite, 11 parts by weight of light calcium carbonate, 7 parts by weight of polyaluminum chloride, 11 parts by weight of lightweight aggregate, 2 parts by weight of reinforcing fiber and 2 parts by weight of graphene oxide are stirred to obtain a mixture.

Example 1 of step S2: and (3) adding 1.5 parts by weight of water reducing agent and 2 parts by weight of other auxiliary agents in the step S1, uniformly dispersing in water, adding the powder, continuously stirring for 50S to obtain mixed slurry, and finally adding 1 part by weight of foaming agent into the mixture to obtain the initial concrete material.

Example 2 of step S2: and (3) adding 3.5 parts by weight of water reducing agent and 5 parts by weight of other auxiliary agents in the step S1, adding the powder after the water reducing agent and the other auxiliary agents are uniformly dispersed in the water, continuously stirring for 120S to obtain mixed slurry, and finally adding 3 parts by weight of foaming agent into the mixture to obtain the initial concrete material.

Example 3 of step S2: and (3) adding 2 parts by weight of water reducing agent and 3 parts by weight of other auxiliary agent in the step S1, uniformly dispersing in water, adding the powder, continuously stirring for 60S to obtain mixed slurry, and finally adding 1-3 parts by weight of foaming agent into the mixture to obtain the initial concrete material.

As a technical optimization scheme of the invention, the lightweight aggregate is any one of clay, ceramsite, pumice, polyethylene foam plastic and wood chips.

In this embodiment: the embodiment can improve the adhesion performance of the lightweight aggregate.

As a technical optimization scheme of the invention, the particle size of the lightweight aggregate is 2-8 mm.

In this embodiment: this embodiment can improve the mixing connection ability of the lightweight aggregate.

As a technical optimization scheme of the invention, the reinforced fiber is any one of polypropylene fiber, polyhexamethylene adipamide fiber, glass fiber and plant fiber.

In this embodiment: this embodiment can improve the impact resistance of the reinforcing fiber.

As a technical optimization scheme of the invention, the foaming agent is any one or more of aluminum powder, magnesium powder, zinc powder, hydrogen peroxide and rosin soap.

In this embodiment: this example can improve the foaming properties of the blowing agent.

As a technical optimization scheme of the invention, the water reducing agent is any one of an FDN type water reducing agent, a UNF-2 type water reducing agent, an AF type water reducing agent, an S type water reducing agent and an MF type water reducing agent.

In this embodiment: this embodiment can improve the adsorption performance of water-reducing agent to water.

As a technical optimization scheme of the invention, other auxiliary agents are any one or more of a self-stabilizing agent, a water-retaining agent, an early strength agent and a retarder.

In this embodiment: this embodiment can improve the stability of other adjuvants.

As a technical optimization scheme of the invention, the foam stabilizer is any one of sodium dodecyl benzene sulfonate, polyacrylamide and sodium stearate.

In this embodiment: this embodiment can improve the adhesion performance of foam stabilizer to liquid.

As a technical optimization scheme of the invention, the water-retaining agent is any one of hydroxypropyl methyl cellulose ether or hydroxyethyl methyl enhanced cellulose ether.

In this embodiment: this embodiment can increase the hydrophobicity of the water-retaining agent.

In a preferred embodiment of the present invention, the container is made of glass or stainless steel in step S3.

In this embodiment: the embodiment can improve the capacity of the container for accommodating the initial concrete material.

The working principle is as follows:

the invention provides a preparation method of high-ductility and high-strength concrete, which comprises the following steps: s1, stirring the prefabricated raw materials; s2, preparing a concrete initial material; s3, standing; s4, flocculation; s5, filling a mold;

in step S1, the concrete embodiment is that cement 20-40 parts by weight, fine sand 20-35 parts by weight, diatomite 3-13 parts by weight, light calcium carbonate 1-12 parts by weight, polyaluminium chloride 5-9 parts by weight, lightweight aggregate 15-28 parts by weight, reinforcing fiber 1-3 parts by weight and graphene oxide 1-3 parts by weight are stirred to obtain a mixture.

In step S2, the concrete implementation mode is that 1.5-3.5 parts by weight of water reducing agent and 2-5 parts by weight of other auxiliary agents are added in step S1, the mixture is added after being uniformly dispersed in water, the powder is continuously stirred for 50-120S to obtain mixed slurry, and finally 1-3 parts by weight of foaming agent is added into the mixture, so that the initial concrete material is prepared.

In step S3, the concrete starting material prepared in step S2 is placed in a container and left to stand for 10S to 20S.

In step S4, a specific embodiment is to add 3 to 7 parts by weight of a flocculating agent to the concrete starting material left standing in step S3 to flocculate the concrete starting material.

In step S5, the concrete is prepared by placing the flocculated concrete starting material obtained in step S4 into a mold, adding 1-5 parts by weight of a foaming agent into the mold, sealing the mold, air-drying for 2-5 hours, and then removing the mold to obtain the concrete with high ductility and high strength.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.