阅读说明：本技术 一种高性能泡沫混凝土用添加剂的制备方法 (Preparation method of additive for high-performance foam concrete ) 是由 沈丽萍 于 2021-01-12 设计创作，主要内容包括：本发明属于混凝土添加剂技术领域,具体涉及一种高性能泡沫混凝土用添加剂的制备方法。本发明以混合渣作为基础原料,通过利用盐酸对基础原料进行溶解,将其中的金属物质进行析出,随后通过利用辅助添加剂将其中金属进行絮凝结合,再与混合颗粒、钛酸四丁酯等原料进行混合,通过挤压,煅烧,可以有效形成多孔颗粒,并且将其中的金属元素负载其表面,同时形成的钛元素负载在其表面,最后与复合料、聚(N-异丙基丙烯酰胺)进行混合,通过复合料的作用,可以很好的实现对于颗粒的包裹。(The invention belongs to the technical field of concrete additives, and particularly relates to a preparation method of an additive for high-performance foam concrete. According to the invention, the mixed slag is used as a basic raw material, the basic raw material is dissolved by hydrochloric acid, metal substances in the basic raw material are separated out, then the metal in the basic raw material is subjected to flocculation bonding by an auxiliary additive, and then the basic raw material is mixed with raw materials such as mixed particles and tetrabutyl titanate, so that porous particles can be effectively formed by extrusion and calcination, the metal element in the porous particles is loaded on the surface of the porous particles, the formed titanium element is loaded on the surface of the porous particles, and finally the porous particles are mixed with a composite material and poly (N-isopropylacrylamide), and the particles can be well wrapped under the action of the composite material.)

1. The preparation method of the additive for the high-performance foam concrete is characterized by comprising the following steps of:

(1) mixing the mixed slag and hydrochloric acid according to the mass ratio of 1: 5-7, stirring, filtering, collecting filtrate, uniformly mixing the filtrate and auxiliary additives according to the mass ratio of 15: 2-4, standing, concentrating, spray-drying, and collecting dried substances;

(2) taking 100-120 parts by weight of mixed particles, 30-40 parts by weight of tetrabutyl titanate, 10-15 parts by weight of dry matter, 8-10 parts by weight of auxiliary agent, 5-10 parts by weight of polystyrene foam, 4-8 parts by weight of fiber and 2-15 parts by weight of polyvinyl alcohol, firstly putting the mixed particles, tetrabutyl titanate, dry matter and fiber into a ball mill for ball milling, and collecting ball milled matter;

(3) uniformly mixing the ball-milled material, polystyrene foam, an auxiliary agent and polyvinyl alcohol, putting the mixture into a mould, extruding, drying, heating, preserving heat, demoulding, crushing, sieving, and collecting sieved particles;

(4) uniformly mixing the sieved particles, the composite material and water according to the mass ratio of 10: 2-4: 15, adding poly (N-isopropylacrylamide) accounting for 10-15% of the mass of the sieved particles, stirring, and freeze-drying to obtain the additive for the high-performance foam concrete.

2. The preparation method of the additive for high-performance foam concrete according to claim 1, wherein the mixed slag in the step (1) is obtained by mixing and crushing blast furnace slag and coal gangue according to a mass ratio of 4: 7.

3. The method for preparing the additive for high performance foam concrete according to claim 1, wherein the auxiliary additive in the step (1) is any one of polyethyleneimine and polyacrylamide.

4. The preparation method of the additive for high-performance foam concrete according to claim 1, wherein the fiber in the step (2) is formed by mixing straw fiber and sodium bicarbonate according to a mass ratio of 10: 1.

5. The preparation method of the additive for high-performance foam concrete according to claim 1, wherein the auxiliary agent is formed by mixing blast furnace slag and red mud according to a mass ratio of 5: 4.

6. The preparation method of the additive for high-performance foam concrete according to claim 1, wherein the composite material in the step (4) is prepared by mixing chromium acetate and aluminum citrate according to the mass ratio of 1: 2.

Technical Field

The invention belongs to the technical field of concrete additives, and particularly relates to a preparation method of an additive for high-performance foam concrete.

Background

The foam concrete has wide application prospect as an inorganic building heat-insulating material with light weight, good heat insulation and fire resistance. The foam concrete is formed by introducing gas into cement slurry in a chemical or physical mode and reasonably curing and forming the gas-containing concrete with a large number of air hole structures. A large number of holes are formed in the foam concrete, and air which is not circulated in the holes can cut off heat exchange, so that the heat conductivity coefficient of the foam concrete is lower than that of common concrete.

At present, cement is the most main cementing material of foam concrete, and a plurality of researchers research and introduce different admixtures to improve the performance of the foam concrete. The novel foam concrete with lower heat conductivity coefficient and higher compressive strength is prepared by blending the sulphoaluminate cement with a certain proportion of fly ash and silica fume. The influence of different fly ash on the compressive strength and the pore structure of the foam concrete at present shows that the fly ash influences the compressive strength of the foam concrete mainly by improving the pore structure of the foam concrete. The single-doped fly ash, mineral powder and the compound doping thereof have influence on the properties of the foam concrete, such as compressive strength, heat conductivity coefficient, water absorption rate and the like. And the change rule of the performance of the foam concrete along with the water-cement ratio, the dry density, the fiber length and the fiber type shows that compared with the plain foam concrete, the peak strain corresponding to the peak stress of the fiber reinforced foam concrete is reduced, and the elastic modulus and the residual stress are greatly increased. In addition, the pore structure of foam concrete is becoming a research focus. The pore structure of the foam concrete is tested by using a mercury pressure method, a computed tomography imaging technology and a vacuum water saturation absorption method, and the result shows that the average pore diameter and the pore shape factor of the foam concrete are improved along with the reduction of the density. The influence of the water-gel ratio on the average pore diameter, porosity and compressive strength of the foam concrete shows that the porosity of the foam concrete is reduced along with the increase of the water-gel ratio, and the average pore diameter is increased. However, the existing foam concrete has poor foaming effect, which causes the performance of the foam concrete to be reduced.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: aiming at the problem of performance reduction of foam concrete caused by poor foaming effect of the foam concrete, the preparation method of the additive for the high-performance foam concrete is provided.

In order to solve the technical problems, the invention adopts the following technical scheme:

a preparation method of an additive for high-performance foam concrete comprises the following steps:

(1) mixing the mixed slag and hydrochloric acid according to the mass ratio of 1: 5-7, stirring, filtering, collecting filtrate, uniformly mixing the filtrate and auxiliary additives according to the mass ratio of 15: 2-4, standing, concentrating, spray-drying, and collecting dried substances;

(2) taking 100-120 parts by weight of mixed particles, 30-40 parts by weight of tetrabutyl titanate, 10-15 parts by weight of dry matter, 8-10 parts by weight of auxiliary agent, 5-10 parts by weight of polystyrene foam, 4-8 parts by weight of fiber and 2-15 parts by weight of polyvinyl alcohol, firstly putting the mixed particles, tetrabutyl titanate, dry matter and fiber into a ball mill for ball milling, and collecting ball milled matter;

(3) uniformly mixing the ball-milled material, polystyrene foam, an auxiliary agent and polyvinyl alcohol, putting the mixture into a mould, extruding, drying, heating, preserving heat, demoulding, crushing, sieving, and collecting sieved particles;

(4) uniformly mixing the sieved particles, the composite material and water according to the mass ratio of 10: 2-4: 15, adding poly (N-isopropylacrylamide) accounting for 10-15% of the mass of the sieved particles, stirring, and freeze-drying to obtain the additive for the high-performance foam concrete.

The mixed slag in the step (1) is obtained by mixing and crushing blast furnace slag and coal gangue according to the mass ratio of 4: 7.

The auxiliary additive in the step (1) is any one of polyethyleneimine and polyacrylamide.

The fiber in the step (2) is formed by mixing straw fiber and sodium bicarbonate according to the mass ratio of 10: 1.

The auxiliary agent is formed by mixing blast furnace slag and red mud according to a mass ratio of 5: 4.

The composite material in the step (4) is prepared by mixing chromium acetate and aluminum citrate according to the mass ratio of 1: 2.

Compared with other methods, the method has the beneficial technical effects that:

(1) according to the invention, the mixed slag is used as a basic raw material, the basic raw material is dissolved by hydrochloric acid, metal substances in the basic raw material are separated out, then the metal in the basic raw material is subjected to flocculation bonding by an auxiliary additive, and then the basic raw material is mixed with raw materials such as mixed particles and tetrabutyl titanate, so that porous particles can be effectively formed by extrusion and calcination, the metal elements in the porous particles are loaded on the surface of the porous particles, the formed titanium elements are loaded on the surface of the porous particles, and finally the porous particles are mixed with a composite material and poly (N-isopropylacrylamide), and the particles can be well wrapped under the action of the composite material;

(2) when the additive is used, the combination strength between the additive and raw materials such as concrete is increased through the action of the composite material and gel, the embedding strength between the raw materials is increased through an internal porous structure, and the mechanical property of the foam concrete is improved.

Detailed Description

The mixed slag is obtained by mixing and crushing blast furnace slag and coal gangue according to the mass ratio of 4: 7.

The auxiliary additive is any one of polyethyleneimine and polyacrylamide.

The fiber is formed by mixing straw fiber and sodium bicarbonate according to the mass ratio of 10: 1.

The auxiliary agent is formed by mixing blast furnace slag and red mud according to the mass ratio of 5: 4.

The composite material is prepared by mixing chromium acetate and aluminum citrate according to the mass ratio of 1: 2.

A preparation method of an additive for high-performance foam concrete comprises the following steps:

(1) mixing the mixed slag and 1.0mol/L hydrochloric acid according to a mass ratio of 1: 5-7, stirring for 1h, filtering, collecting filtrate, uniformly mixing the filtrate and auxiliary additives according to a mass ratio of 15: 2-4, standing for 2h, concentrating to 70% of the original volume, spray-drying, and collecting dried substances;

(2) taking 100-120 parts of mixed particles, 30-40 parts of tetrabutyl titanate, 10-15 parts of dry matter, 8-10 parts of auxiliary agent, 5-10 parts of polystyrene foam, 4-8 parts of fiber and 2-15 parts of polyvinyl alcohol according to parts by weight, firstly putting the mixed particles, tetrabutyl titanate, dry matter and fiber into a ball mill, carrying out ball milling for 40min at a speed of 800r/min, and collecting ball-milled matter;

(3) uniformly mixing the ball-milled material, polystyrene foam, an auxiliary agent and polyvinyl alcohol, putting the mixture into a mold, extruding under 5MPa, drying, heating to 800-900 ℃, preserving heat for 1-3 hours, demolding, crushing, sieving with a 500-mesh sieve, and collecting sieved particles;

(4) uniformly mixing the sieved particles, the composite material and water according to the mass ratio of 10: 2-4: 15, adding poly (N-isopropylacrylamide) accounting for 10-15% of the mass of the sieved particles, stirring, and freeze-drying to obtain the additive for the high-performance foam concrete.

Example 1

The mixed slag is obtained by mixing and crushing blast furnace slag and coal gangue according to the mass ratio of 4: 7.

The auxiliary additive is any one of polyethyleneimine and polyacrylamide.

The fiber is formed by mixing straw fiber and sodium bicarbonate according to the mass ratio of 10: 1.

The auxiliary agent is formed by mixing blast furnace slag and red mud according to the mass ratio of 5: 4.

The composite material is prepared by mixing chromium acetate and aluminum citrate according to the mass ratio of 1: 2.

A preparation method of an additive for high-performance foam concrete comprises the following steps:

(1) mixing the mixed slag and 1.0mol/L hydrochloric acid according to the mass ratio of 1:7, stirring for 1h, filtering, collecting filtrate, uniformly mixing the filtrate and auxiliary additives according to the mass ratio of 15:4, standing for 2h, concentrating to 70% of the original volume, spray-drying, and collecting dried substances;

(2) taking 120 parts of mixed particles, 40 parts of tetrabutyl titanate, 15 parts of dry matter, 10 parts of auxiliary agent, 10 parts of polystyrene foam, 8 parts of fiber and 15 parts of polyvinyl alcohol according to parts by weight, firstly putting the mixed particles, tetrabutyl titanate, dry matter and fiber into a ball mill, carrying out ball milling for 40min at the speed of 800r/min, and collecting the ball milled matter;

(3) uniformly mixing the ball-milled material, polystyrene foam, an auxiliary agent and polyvinyl alcohol, putting the mixture into a mould, extruding under 5MPa, drying, heating to 900 ℃, preserving heat for 3 hours, demoulding, crushing, sieving with a 500-mesh sieve, and collecting sieved particles;

(4) uniformly mixing the screened particles, the composite material and water according to the mass ratio of 10:4:15, adding poly (N-isopropylacrylamide) accounting for 15% of the mass of the screened particles, stirring, and freeze-drying to obtain the additive for the high-performance foam concrete.

Example 2

The mixed slag is obtained by mixing and crushing blast furnace slag and coal gangue according to the mass ratio of 4: 7.

The auxiliary additive is any one of polyethyleneimine and polyacrylamide.

The fiber is formed by mixing straw fiber and sodium bicarbonate according to the mass ratio of 10: 1.

The auxiliary agent is formed by mixing blast furnace slag and red mud according to the mass ratio of 5: 4.

The composite material is prepared by mixing chromium acetate and aluminum citrate according to the mass ratio of 1: 2.

A preparation method of an additive for high-performance foam concrete comprises the following steps:

(1) mixing the mixed slag and 1.0mol/L hydrochloric acid according to the mass ratio of 1:6, stirring for 1h, filtering, collecting filtrate, uniformly mixing the filtrate and auxiliary additives according to the mass ratio of 15:3, standing for 2h, concentrating to 70% of the original volume, spray-drying, and collecting dried substances;

(2) taking 115 parts of mixed particles, 35 parts of tetrabutyl titanate, 13 parts of a dry matter, 9 parts of an auxiliary agent, 8 parts of polystyrene foam, 6 parts of fiber and 10 parts of polyvinyl alcohol according to parts by weight, firstly putting the mixed particles, tetrabutyl titanate, the dry matter and the fiber into a ball mill, carrying out ball milling for 40min at the speed of 800r/min, and collecting the ball milled matter;

(3) uniformly mixing the ball-milled material, polystyrene foam, an auxiliary agent and polyvinyl alcohol, putting the mixture into a mould, extruding under 5MPa, drying, heating to 850 ℃, preserving heat for 3 hours, demoulding, crushing, sieving with a 500-mesh sieve, and collecting sieved particles;

(4) uniformly mixing the screened particles, the composite material and water according to the mass ratio of 10:3:15, adding poly (N-isopropylacrylamide) accounting for 13% of the mass of the screened particles, stirring, and freeze-drying to obtain the additive for the high-performance foam concrete.

Example 3

The mixed slag is obtained by mixing and crushing blast furnace slag and coal gangue according to the mass ratio of 4: 7.

The auxiliary additive is any one of polyethyleneimine and polyacrylamide.

The fiber is formed by mixing straw fiber and sodium bicarbonate according to the mass ratio of 10: 1.

The auxiliary agent is formed by mixing blast furnace slag and red mud according to the mass ratio of 5: 4.

The composite material is prepared by mixing chromium acetate and aluminum citrate according to the mass ratio of 1: 2.

A preparation method of an additive for high-performance foam concrete comprises the following steps:

(1) mixing the mixed slag and 1.0mol/L hydrochloric acid according to the mass ratio of 1:5, stirring for 1h, filtering, collecting filtrate, uniformly mixing the filtrate and auxiliary additives according to the mass ratio of 15:2, standing for 2h, concentrating to 70% of the original volume, spray-drying, and collecting dried substances;

(2) taking 100 parts of mixed particles, 30 parts of tetrabutyl titanate, 10 parts of dry matter, 8 parts of auxiliary agent, 5 parts of polystyrene foam, 4 parts of fiber and 2 parts of polyvinyl alcohol according to parts by weight, firstly putting the mixed particles, tetrabutyl titanate, dry matter and fiber into a ball mill, carrying out ball milling for 40min at the speed of 800r/min, and collecting the ball milled matter;

(3) uniformly mixing the ball-milled material, polystyrene foam, an auxiliary agent and polyvinyl alcohol, putting the mixture into a mould, extruding at 5MPa, drying, heating to 800 ℃, preserving heat for 1h, demoulding, crushing, sieving with a 500-mesh sieve, and collecting sieved particles;

(4) uniformly mixing the screened particles, the composite material and water according to the mass ratio of 10:2:15, adding poly (N-isopropylacrylamide) accounting for 10% of the mass of the screened particles, stirring, and freeze-drying to obtain the additive for the high-performance foam concrete.

Comparative example 1

The fiber is formed by mixing straw fiber and sodium bicarbonate according to the mass ratio of 10: 1.

The auxiliary agent is formed by mixing blast furnace slag and red mud according to the mass ratio of 5: 4.

The composite material is prepared by mixing chromium acetate and aluminum citrate according to the mass ratio of 1: 2.

A preparation method of an additive for high-performance foam concrete comprises the following steps:

(1) taking 30 parts of tetrabutyl titanate, 10 parts of dry matter, 8 parts of auxiliary agent, 5 parts of polystyrene foam, 4 parts of fiber and 2 parts of polyvinyl alcohol according to parts by weight, firstly putting tetrabutyl titanate, dry matter and fiber into a ball mill, carrying out ball milling for 40min at the speed of 800r/min, and collecting ball-milled matter;

(2) uniformly mixing the ball-milled material, polystyrene foam, an auxiliary agent and polyvinyl alcohol, putting the mixture into a mould, extruding at 5MPa, drying, heating to 800 ℃, preserving heat for 1h, demoulding, crushing, sieving with a 500-mesh sieve, and collecting sieved particles;

(3) uniformly mixing the screened particles, the composite material and water according to the mass ratio of 10:2:15, adding poly (N-isopropylacrylamide) accounting for 10% of the mass of the screened particles, stirring, and freeze-drying to obtain the additive for the high-performance foam concrete.

Comparative example 2

The mixed slag is obtained by mixing and crushing blast furnace slag and coal gangue according to the mass ratio of 4: 7.

The auxiliary additive is any one of polyethyleneimine and polyacrylamide.

The fiber is formed by mixing straw fiber and sodium bicarbonate according to the mass ratio of 10: 1.

The auxiliary agent is formed by mixing blast furnace slag and red mud according to the mass ratio of 5: 4.

The composite material is prepared by mixing chromium acetate and aluminum citrate according to the mass ratio of 1: 2.

A preparation method of an additive for high-performance foam concrete comprises the following steps:

(1) mixing the mixed slag and 1.0mol/L hydrochloric acid according to the mass ratio of 1:5, stirring for 1h, filtering, collecting filtrate, uniformly mixing the filtrate and auxiliary additives according to the mass ratio of 15:2, standing for 2h, concentrating to 70% of the original volume, spray-drying, and collecting dried substances;

(2) taking 100 parts of mixed particles, 30 parts of tetrabutyl titanate, 10 parts of dry matter, 8 parts of auxiliary agent, 5 parts of polystyrene foam, 4 parts of fiber and 2 parts of polyvinyl alcohol according to parts by weight, firstly putting the mixed particles, tetrabutyl titanate, dry matter and fiber into a ball mill, carrying out ball milling for 40min at the speed of 800r/min, and collecting the ball milled matter;

(3) uniformly mixing the ball-milled material, polystyrene foam, an auxiliary agent and polyvinyl alcohol, putting the mixture into a mould, extruding at 5MPa, drying, heating to 800 ℃, preserving heat for 1h, demoulding, crushing, sieving with a 500-mesh sieve, collecting sieved particles, and obtaining the additive for the high-performance foam concrete.

The additives for high-performance foam concrete in the examples and the comparative examples are added according to the mass of 3% of the added concrete, and the raw materials (water, cement, animal protein foaming agent, silica fume and fly ash) are mixed and foamed to prepare the foam concrete, and the following tests are carried out:

the compressive strength of the foam concrete test piece is tested according to JC/T2357-2016 & lt & ltfoam concrete product performance test method & gt & lt & gt.

According to JC/T2357-2016, a CD-DR3030 thermal conductivity tester produced by Shenyang Banaba electromechanical Co., Ltd is adopted to test the thermal conductivity of the foam concrete test piece.

The test results are as follows:

in conclusion, the additive for high-performance foam concrete prepared by the invention has better effect.