CN110655343A

CN110655343A - Modified concrete

Info

Publication number: CN110655343A
Application number: CN201810685539.3A
Authority: CN
Inventors: 徐小四
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-06-28
Filing date: 2018-06-28
Publication date: 2020-01-07

Abstract

The invention relates to the field of building materials, and discloses a preparation method of modified concrete, which comprises the following steps of (1) preparing a concrete modifier, namely weighing calcium powder, calcium lignosulfonate powder, silicon dioxide powder, dispersible latex powder and coal ash powder according to a ratio, uniformly mixing the weighed components to form the concrete modifier, (2) preparing the concrete, namely weighing silicate cement, sand, broken stone, water and the concrete modifier according to the ratio, adding the weighed concrete modifier into 1/2 ~ 2/3 water weighed to be stirred for 5 ~ 6 seconds to form a mixed solution, then adding the weighed cement, the sand and the mixed solution into a concrete stirrer to be stirred for 15 seconds at a stirring speed of 30 ~ 35 revolutions per minute, finally adding the weighed broken stone and the rest water to be stirred for 20 seconds at a stirring speed of 30 ~ 35 revolutions per minute to form a concrete mixture.

Description

Modified concrete

Technical Field

The invention relates to the field of building materials, in particular to a preparation method of modified concrete.

Background

Concrete, referred to as "concrete" for short: refers to the general name of engineering composite materials formed by cementing aggregate into a whole by cementing materials. The term concrete generally refers to cement as the cementing material and sand and stone as the aggregate; the cement concrete, also called common concrete, is obtained by mixing with water (which may contain additives and admixture) according to a certain proportion and stirring, and is widely applied to civil engineering, for example, the high-toughness anti-cracking cement concrete and the preparation method thereof are described in CN 201611140991.9.

In cold areas and salinization areas in the north, because of severe environment, the frost damage of concrete buildings can generate cracks and peeling off, and the erosion of salinization is also serious, thereby causing the leakage, the cracks and the like of concrete engineering, and reducing the durability and the safety of the concrete engineering. However, the strength grade of common concrete is low, and the frost resistance and the erosion resistance are poor, so that the concrete with strong frost resistance and erosion resistance is urgently needed.

Disclosure of Invention

The invention mainly solves the technical problem of providing the preparation method of the modified concrete, which is simple and can effectively improve the performance of the concrete, so that the concrete has strong binding capacity and good freezing and erosion resistance.

The technical scheme of the invention is as follows:

a preparation method of modified concrete specifically comprises the following steps:

(1) preparing a concrete modifier: weighing the following components in proportion: calcium powder, calcium lignosulfonate powder, silicon dioxide powder, dispersible latex powder and coal ash powder; uniformly mixing the weighed components to form a concrete modifier;

(2) the concrete is prepared by weighing the following components according to the mixture ratio, namely portland cement, sand, gravel, water and a concrete modifier, adding the weighed concrete modifier into weighed 1/2 ~ 2/3 water, stirring for 5 ~ 6 seconds to form a mixed solution, then adding the weighed cement, the sand and the mixed solution into a concrete stirrer, stirring for 15 seconds at the stirring speed of 30 ~ 35 revolutions per minute, finally adding the weighed gravel and the rest water, and stirring for 20 seconds at the stirring speed of 30 ~ 35 revolutions per minute to form a concrete mixture.

Further, the modified concrete comprises the following components in parts by weight:

80-100 parts of cement;

50-60 parts of water;

150 ~ 250 parts of sand;

5 ~ 8 parts of a concrete modifier;

the concrete modifier comprises the following components in parts by weight:

calcium powder 5 ~ 15 parts

1 ~ 5 parts of calcium lignosulfonate powder;

4 ~ 8 parts of silicon dioxide powder;

2 ~ 6 parts of dispersible latex powder;

20 ~ 40 parts of coal ash powder

5 ~ 15 parts of dipropylene glycol methyl ether;

4 ~ 8 parts of polyethylene wax emulsion;

tributoxyethyl phosphate 1 ~ 5 parts.

Further, the concrete modifier comprises the following components in parts by weight:

8 parts of calcium powder;

3 parts of calcium lignosulphonate powder;

5 parts of silicon dioxide powder;

4 parts of dispersible latex powder;

25 portions of coal ash powder

5 ~ 15 parts of dipropylene glycol methyl ether;

4 ~ 8 parts of polyethylene wax emulsion;

tributoxyethyl phosphate 1 ~ 5 parts.

Furthermore, the film forming temperature of the dispersible latex powder is more than or equal to 0 ℃.

Further, the silicon dioxide powder is nano silicon dioxide powder.

Further, the cement is low alkali portland cement.

The invention has the beneficial effects that: the preparation method of the modified concrete is simple, can effectively improve the performance of the concrete, has strong concrete binding capacity and good freezing and erosion resistance, and can be widely used in northern cold areas and salinization areas.

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.

Example 1

Preparing a concrete modifier: weighing the following components in parts by weight: 8 parts of calcium powder; 3 parts of calcium lignosulfonate powder; 5 parts of silicon dioxide powder; 4 parts of dispersible latex powder; coal ash powder; 25 parts of dipropylene glycol methyl ether and 5 parts of dipropylene glycol methyl ether; 8 parts of polyethylene wax emulsion; 1 part of tributoxyethyl phosphate. And uniformly mixing the weighed components to form a concrete modifier sample I.

Preparing concrete: weighing the following components in parts by weight: 100 parts of Portland cement, 80 parts of sand, 150 parts of broken stone, 50 parts of water and 5 parts of concrete modifier sample. Adding the weighed concrete modifier sample I into weighed 1/2 water, stirring for 5 seconds to form a mixed solution, then adding the weighed portland cement, sand and the mixed solution into a concrete stirrer together, and stirring for 15 seconds at the stirring speed of 30 revolutions per minute; and finally, adding the weighed broken stones and the rest water, and stirring for 20 seconds at the stirring speed of 30 revolutions per minute to form a concrete mixture.

Pouring a test piece: and (3) casting and molding a first test piece by using the concrete mixture.

Example 2

Preparing a concrete modifier: weighing the following components in parts by weight: 10 parts of calcium powder; 2 parts of calcium lignosulfonate powder; 6 parts of silicon dioxide powder; 5 parts of dispersible latex powder; coal ash powder; 35 parts of dipropylene glycol methyl ether and 15 parts of dipropylene glycol methyl ether; 6 parts of polyethylene wax emulsion; and 5 parts of tributoxyethyl phosphate. And uniformly mixing the weighed components to form a concrete modifier sample II.

Preparing concrete: weighing the following components in parts by weight: 100 parts of low-alkali portland cement, 100 parts of sand, 180 parts of broken stone, 60 parts of water and 6 parts of concrete modifier sample II. Adding the weighed concrete modifier sample I into weighed 2/3 water, stirring for 5 seconds to form a mixed solution, then adding the weighed portland cement, sand and the mixed solution into a concrete stirrer together, and stirring for 15 seconds at the stirring speed of 35 revolutions per minute; and finally, adding the weighed broken stones and the rest water, and stirring for 20 seconds at the stirring speed of 35 revolutions per minute to form a concrete mixture.

Pouring a test piece: and (5) casting and molding a second test piece by using the concrete mixture.

And (3) performing freeze-thaw tests and sulfate corrosion tests on the test piece I and the test piece II, wherein the freezing resistance and the corrosion resistance are improved by 3 ~ 5 times.

While the invention has been described in conjunction with the specific embodiments set forth above, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the spirit and scope of the appended claims.

Claims

1. The preparation method of the modified concrete is characterized by comprising the following steps:

(1) preparing a concrete modifier: weighing the following components in proportion: calcium powder, calcium lignosulfonate powder, silicon dioxide powder, dispersible latex powder, coal ash powder, dipropylene glycol methyl ether, polyethylene wax emulsion and tributoxyethyl phosphate; uniformly mixing the weighed components to form a concrete modifier;

2. The method for preparing the modified concrete according to claim 1, wherein the modified concrete comprises the following components in parts by weight:

80-100 parts of cement;

50-60 parts of water;

150 ~ 250 parts of sand;

5 ~ 8 parts of a concrete modifier;

the concrete modifier comprises the following components in parts by weight:

calcium powder 5 ~ 15 parts

1 ~ 5 parts of calcium lignosulfonate powder;

4 ~ 8 parts of silicon dioxide powder;

2 ~ 6 parts of dispersible latex powder;

20 ~ 40 parts of coal ash powder;

5 ~ 15 parts of dipropylene glycol methyl ether;

4 ~ 8 parts of polyethylene wax emulsion;

tributoxyethyl phosphate 1 ~ 5 parts.

3. The preparation method of the modified concrete according to claim 2, wherein the concrete modifier comprises the following components in parts by weight:

8 parts of calcium powder;

3 parts of calcium lignosulphonate powder;

5 parts of silicon dioxide powder;

4 parts of dispersible latex powder;

25 parts of coal ash powder;

5 ~ 15 parts of dipropylene glycol methyl ether;

4 ~ 8 parts of polyethylene wax emulsion;

tributoxyethyl phosphate 1 ~ 5 parts.

4. The method for preparing modified concrete according to claim 1, wherein the film forming temperature of the dispersible latex powder is greater than or equal to 0 ℃.

5. The method for preparing modified concrete according to claim 1, wherein the silica powder is nano silica powder.

6. The method of claim 1, wherein the cement is a low alkali portland cement.