CN115677285A - Foam concrete material and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of building materials, and provides a foam concrete material and a preparation method thereof. The foam concrete material comprises: the additive comprises an active agent, an exciting agent and a calcium ion supplement, and the addition amount of the additive is 1-1.5% of the cement amount. The invention does not need to add fly ash, activates the activity of the coal slag by adding the additive, leads the coal slag to generate hydration reaction, achieves the aim of reducing the cement dosage when the strength reaches the standard, reduces the cement dosage, lowers the total cost and saves resources.

Description

Foam concrete material and preparation method thereof

Technical Field

The invention relates to the technical field of building materials, in particular to a foam concrete material and a preparation method thereof.

Background

The foam concrete is a light concrete material containing a large number of closed air holes, which is formed by fully foaming a foaming agent in a mechanical mode through a foaming system of a foaming machine, then mixing and stirring raw materials such as cement, water and the like, uniformly dispersing foams generated by the foaming agent in cement paste for casting and molding, solidifying and reinforcing air bubbles through the gelling action of the cement and then curing. In the prior art, fly ash is one of components of foam concrete, but the granularity of the fly ash is below 200 meshes, so that the flowability of mortar aggregates in the concrete is reduced, the mixing effect among bubbles is weakened, and the compactness of the mortar aggregates is reduced.

In the existing building design, a large number of autoclaved aerated concrete blocks are used as materials of partition walls, and because the autoclaved aerated concrete blocks are influenced by factors such as low yield, high energy consumption, slow construction, more subsequent processes and the like, construction units seek a substitute with similar performance, while the foam concrete wall has the advantages of light weight, fast construction, good integrity, no plastering and the like, and is a good substitute. Therefore, in order to solve the above problems, it is urgently needed to develop a foam concrete material for a partition wall, which does not contain fly ash, has a reduced cement amount and has a satisfactory strength.

Disclosure of Invention

The invention provides a foam concrete material, which has the following specific implementation modes:

the foam concrete material is characterized by comprising cement, coal cinder and an additive, wherein the additive comprises an active agent, an exciting agent and a calcium ion supplement, and the addition amount of the additive is 1-1.5% of the cement dosage.

Further, the coating comprises the following components in parts by weight: 39-43 parts of foaming agent, 260-285 parts of water, 350-380 parts of cement and 800-900 parts of coal cinder.

Further, every 1m ³ The foam concrete material contains 350-380kg of cement.

Further, the active agent is at least one of sodium naphthalene sulfonate, melamine sulfonated resin and lignin calcium sulfonate.

Further, the active agents are sodium naphthalene sulfonate, melamine sulfonated resin and calcium lignosulfonate.

Further, the activator is at least one of sodium silicate and potassium hydroxide.

Further, the excitant is sodium silicate and potassium hydroxide.

Further, the calcium ion supplement is calcium formate.

Further, the coating comprises the following components in parts by weight: 360 parts of cement, 870 parts of coal cinder, 0.69 part of sodium naphthalene sulfonate, 0.32 part of melamine sulfonated resin, 0.21 part of lignin calcium sulfonate, 1.25 parts of sodium silicate, 0.13 part of potassium hydroxide and 1 part of calcium formate.

In addition, the invention also provides a preparation method of the foam concrete material, which comprises the following steps:

(1) Stirring cement, coal cinder and an additive according to a ratio;

(2) Adding water with the total water consumption of 2/3 into the stirred cement, coal slag and additive;

(3) Adding the rest water after stirring, and stirring again to obtain a mixture;

(4) Adding a foaming agent into a foaming machine to generate foam;

(5) And (4) stirring and mixing the mixture obtained in the step (3) and the foam obtained in the step (4).

Due to the adoption of the technical scheme, the invention has the beneficial technical effects that:

1. the invention does not need to add fly ash, reduces the cement consumption, reduces the total cost and saves resources;

2. under the coordination of the additive, a plurality of active substances and coal cinder participate in hydration reaction, so that the strength of concrete is improved;

3. the invention has simple ingredients and convenient preparation.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A foam concrete material comprises cement, coal cinder and an additive, wherein the additive comprises an active agent, an exciting agent and a calcium ion supplement, and the addition amount of the additive is 1-1.5% of the dosage of the cement. The invention does not need to add fly ash, activates the activity of the coal slag by adding the additive, leads the coal slag to generate hydration reaction, achieves the aim of reducing the cement dosage while reaching the standard of strength, reduces the total cost and saves resources. The dosage of the additive is reasonably controlled to be 1-1.5% of the dosage of the cement, and experiments show that when the dosage of the additive is less than 1% of the dosage of the cement or more than 1.5% of the dosage of the cement, the mechanical property of the foam concrete material is obviously reduced.

In addition, the additive comprises an active agent, an exciting agent and a calcium ion supplement, wherein the active agent is at least one of sodium naphthalene sulfonate, melamine sulfonated resin and calcium lignosulfonate. The activator is at least one of sodium silicate and potassium hydroxide. The calcium ion supplement is calcium formate. The activator can activate the self-activity of the coal cinder, wherein the sodium naphthalene sulfonate also has the effect of improving the workability. Preferably, the three components of sodium naphthalenesulfonate, melamine sulfonated resin and lignin calcium sulfonate are compounded into a composite activator, so that the activity of the coal cinder is further activated, and the workability of the concrete material is improved. The sodium silicate and the potassium hydroxide can excite the coal cinder to generate hydration reaction, and the calcium ion replenisher supplements calcium ions to accelerate the hydration reaction. Further preferably, when the sodium naphthalenesulfonate: melamine sulfonated resin: calcium lignosulfonate: sodium silicate: potassium hydroxide: the calcium formate is 55:25:17:100:10: the effect is optimal at 80 ℃, and at the moment, the admixture can increase the hydration efficiency, improve the workability of concrete, enable the foam concrete structure to be more compact and improve the strength and durability of the concrete.

Example 1

(1) Stirring 360 parts of cement, 870 parts of coal cinder and 3.6 parts of additives (namely 0.69 part of sodium naphthalene sulfonate, 0.32 part of melamine sulfonated resin, 0.21 part of wood element calcium sulfonate, 1.25 parts of sodium silicate, 0.13 part of potassium hydroxide and 1 part of calcium formate) according to a ratio to form a mixture A;

(2) Adding 180 parts of water to the mixture A formed in the step (1);

(3) After stirring, adding 90 parts of water again, and stirring again to obtain a mixture B;

(4) Adding 40 parts of foaming agent into a foaming machine to generate foam;

(5) And (4) stirring and mixing the mixture B obtained in the step (3) and the foam obtained in the step (4).

Example 2

(1) 380 parts of cement, 900 parts of coal cinder and 5.7 parts of additive (namely 1.09 parts of sodium naphthalene sulfonate, 0.49 parts of melamine sulfonated resin, 0.34 parts of wood element calcium sulfonate, 1.99 parts of sodium silicate, 0.2 parts of potassium hydroxide and 1.59 parts of calcium formate) are stirred according to the proportion to form a mixture A;

(2) Adding 190 parts of water to the mixture A formed in the step (1);

(3) After stirring, adding 95 parts of water again, and stirring again to obtain a mixture B;

(4) Adding 43 parts of foaming agent into a foaming machine to generate foam;

(5) And (4) stirring and mixing the mixture B obtained in the step (3) and the foam obtained in the step (4).

Example 3

(1) 350 parts of cement, 800 parts of coal cinder and 4.2 parts of additive (namely 1.8 parts of sodium naphthalene sulfonate, 0.8 part of melamine sulfonated resin, 0.4 part of potassium hydroxide and 1.2 parts of calcium formate) are stirred according to the proportion to form a mixture A;

(2) Adding 170 parts of water to the mixture A formed in the step (1);

(3) After stirring, adding 90 parts of water again, and stirring again to obtain a mixture B;

(4) Adding 40 parts of foaming agent into a foaming machine to generate foam;

(5) And (4) stirring and mixing the mixture B obtained in the step (3) and the foam obtained in the step (4).

Comparative example 1

(1) Stirring 360 parts of cement, 800 parts of coal cinder, 220 parts of fly ash and 3.5 parts of polycarboxylic acid water reducing agent according to a ratio to form a mixture A;

(2) Adding 180 parts of water to the mixture A formed in the step (1);

(3) After stirring, adding 90 parts of water again, and stirring again to obtain a mixture B;

(4) Adding 40 parts of foaming agent into a foaming machine to generate foam;

(5) And (4) stirring and mixing the mixture B obtained in the step (3) and the foam obtained in the step (4).

Comparative example 2

(1) Stirring 320 parts of cement, 770 parts of coal cinder and 3.2 parts of additive (namely 0.62 part of sodium naphthalene sulfonate, 0.28 part of melamine sulfonated resin, 0.19 part of wood element calcium sulfonate, 1.11 parts of sodium silicate, 0.11 part of potassium hydroxide and 0.89 part of calcium formate) according to a ratio to form a mixture A;

(2) Adding 192 parts of water to the mixture A formed in the step (1);

(3) After stirring, adding 96 parts of water again, and stirring again to obtain a mixture B;

(4) Adding 40 parts of foaming agent into a foaming machine to generate foam;

(5) And (4) stirring and mixing the mixture B obtained in the step (3) and the foam obtained in the step (4).

The foamed concrete materials obtained in examples 1 to 3 and comparative examples 1 to 2 were subjected to a compressive strength test, respectively.

TABLE 1 compression Strength test results of the foamed concrete materials obtained in examples 1 to 3 and comparative examples 1 to 2

The test results show that the compressive strength of the foamed concrete materials of comparative examples 1-2 is obviously lower than that of the foamed concrete material of the invention, and the compressive strength of example 1 is higher than that of comparative example 1 although the cement amount is the same and the fly ash is added in the comparative examples 1 and 1, i.e. the cement required by example 1 is lower than that of comparative example 1 when the same compressive strength is achieved, and the fly ash is not required to be added in example 1. In addition, as shown in comparative example 2, when the cement dosage and the coal cinder dosage are not within the protection range of the application, the compressive strength is obviously reduced, so that the application does not need to add fly ash, and the activity of the coal cinder is activated by adding the additive, so that the coal cinder is subjected to hydration reaction, and the purpose of reducing the cement dosage while reaching the strength standard is achieved.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. The foam concrete material is characterized by comprising cement, coal cinder and an additive, wherein the additive comprises an active agent, an exciting agent and a calcium ion supplement, and the addition amount of the additive is 1-1.5% of the dosage of the cement.

2. The foamed concrete material according to claim 1, comprising, in parts by weight: 39-43 parts of foaming agent, 260-285 parts of water, 350-380 parts of cement and 800-900 parts of coal cinder.

3. The foamed concrete material according to claim 1 wherein each 1m of the foamed concrete material is ³ The foam concrete material contains 350-380kg of cement.

4. The foamed concrete material according to claim 1 wherein the active agent is at least one of sodium naphthalene sulfonate, melamine sulfonated resin, and calcium lignosulfonate.

5. The foamed concrete material according to claim 4 wherein the active agents are sodium naphthalene sulfonate, melamine sulfonated resin and calcium lignosulfonate.

6. The foamed concrete material according to claim 1, wherein the activator is at least one of sodium silicate and potassium hydroxide.

7. The foamed concrete material according to claim 6, wherein the activator is sodium silicate and potassium hydroxide.

8. The foamed concrete material according to claim 1, wherein the calcium ion supplement is calcium formate.

9. The foamed concrete material according to claim 1, comprising, in parts by weight: 360 parts of cement, 870 parts of coal cinder, 0.69 part of sodium naphthalene sulfonate, 0.32 part of melamine sulfonated resin, 0.21 part of wood element calcium sulfonate, 1.25 parts of sodium silicate, 0.13 part of potassium hydroxide and 1 part of calcium formate.

10. A method of producing a foamed concrete material according to any one of claims 1 to 9, characterized by the steps of:

(1) Stirring cement, coal cinder and additive according to a ratio;

(2) Adding water with the total water consumption of 2/3 into the stirred cement, coal slag and additive;

(3) Adding the rest water after stirring, and stirring again to obtain a mixture;

(4) Adding a foaming agent into a foaming machine to generate foam;

(5) And (4) stirring and mixing the mixture obtained in the step (3) and the foam obtained in the step (4).