CN107651896B

CN107651896B - Chemical-erosion-resistant high-durability concrete and preparation method thereof

Info

Publication number: CN107651896B
Application number: CN201710954794.9A
Authority: CN
Inventors: 刘静; 平自要; 陈九安; 刘大路; 代步青; 李寅磊; 张勇; 王琪; 翟卫东
Original assignee: Quzhou Hushan Concrete Co ltd
Current assignee: QUZHOU HUSHAN CONCRETE Co.,Ltd.
Priority date: 2017-10-13
Filing date: 2017-10-13
Publication date: 2020-12-18
Anticipated expiration: 2037-10-13
Also published as: CN107651896A

Abstract

The invention provides a preparation method of chemical-erosion-resistant high-durability concrete, which comprises the following steps: 1) mixing absolute ethyl alcohol, glacial acetic acid and a silane coupling agent to prepare M1; 2) under the condition that the pH value is 5-8, adding nano calcium oxide, bentonite and wollastonite into M1 to obtain M2; 3) drying and grinding M2 to obtain M3; 4) the prepared M3, cement, aggregate, fly ash, alumina, rice hull ash and water are mixed to prepare the chemical-erosion-resistant high-durability concrete. The invention has the following beneficial effects: the invention mixes absolute ethyl alcohol, glacial acetic acid and silane coupling agent, then adds nano calcium oxide, bentonite and wollastonite under a certain condition, then dries and grinds the mixture, and further mixes the mixture with cement, aggregate, fly ash, alumina, rice hull ash and water, thereby improving the synergistic performance of the raw materials, effectively resisting chemical erosion and improving the durability of the raw materials.

Description

Chemical-erosion-resistant high-durability concrete and preparation method thereof

Technical Field

The invention relates to the field of concrete, in particular to chemical-erosion-resistant high-durability concrete and a preparation method thereof.

Background

With the continuous development of concrete technology, concrete has been used in more and more construction fields, such as bridge engineering, highway engineering, hydraulic engineering and other engineering fields. Moreover, it has been predicted that the service life of some existing concretes can last over 500 years. However, this prediction does not take into account the effect of human environment. With the continuous progress of science and technology, people also rely on mechanization more and more. Undeniably, the development of industrialization also brings great influence to the environment, and acid rain and haze do not appear around people all the time. The concrete is also easily affected by the environment, so that the durability of the concrete is poor, and particularly, the concrete in the environment such as seaside, Yangtze river, yellow river wetland and the like is easily corroded by substances such as acid, alkali and the like in the external environment, so that the durability of the concrete is affected.

Disclosure of Invention

The invention aims to provide chemical-erosion-resistant high-durability concrete and a preparation method thereof, so as to solve the problem of damage of chemical erosion to the concrete, improve the durability of the concrete and prolong the service life of the concrete.

In order to achieve the above object, the present invention provides a method for preparing a concrete with high durability against chemical attack, comprising the steps of:

1) mixing absolute ethyl alcohol, glacial acetic acid and a silane coupling agent to prepare M1;

2) under the condition that the pH value is 5-8, adding nano calcium oxide, bentonite and wollastonite into M1 to obtain M2;

3) drying and grinding M2 to obtain M3;

4) the prepared M3, cement, aggregate, fly ash, alumina, rice hull ash and water are mixed to prepare the chemical-erosion-resistant high-durability concrete.

The invention also provides the chemical-erosion-resistant high-durability concrete, wherein the chemical-erosion-resistant high-durability concrete is prepared according to the preparation method.

The invention has the following beneficial effects: the invention mixes absolute ethyl alcohol, glacial acetic acid and silane coupling agent, then adds nano calcium oxide, bentonite and wollastonite under a certain condition, then dries and grinds the mixture, and further mixes the mixture with cement, aggregate, fly ash, alumina, rice hull ash and water, thereby improving the synergistic performance of the raw materials, effectively resisting chemical erosion and improving the durability of the raw materials.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below.

Detailed Description

The following is a detailed description of embodiments of the invention, but the invention can be implemented in many different ways, as defined and covered by the claims.

The invention provides a preparation method of chemical-erosion-resistant high-durability concrete, which comprises the following steps:

3) drying and grinding M2 to obtain M3;

The type of silane coupling agent here can be selected within a wide range, for example, KH560, KH570, etc., but of course, in a preferred embodiment, the silane coupling agent in step 1) is selected to be KH550 silane coupling agent.

In a more preferred embodiment, step 2) further comprises roasting and ball milling the bentonite and wollastonite before adding the nano titanium dioxide, the bentonite and the wollastonite into the M1.

In a further preferred embodiment, the calcination temperature is 300-700 ℃ and the calcination time is 1-3 h.

In another preferred embodiment of the present invention, the ball milling time is 10 to 30 min. The ball milling operation may be performed in a manner understood by those skilled in the art.

The amount of the above-mentioned raw materials can be selected within a wide range, for example, in a preferred embodiment of the present invention, the amount of the glacial acetic acid is 0.5 to 2mL, the amount of the silane coupling agent is 0.1 to 1mL, the amount of the nano calcium oxide is 5 to 10g, the amount of the bentonite is 10 to 30g, and the amount of the wollastonite is 5 to 20g, relative to 100mL of anhydrous ethanol in step 1) and step 2).

In another preferred embodiment, in the step 4), relative to 100g of cement, the dosage of M3 is 5-30g, the dosage of aggregate is 150-300g, the dosage of fly ash is 10-30g, the dosage of alumina is 5-10g, the dosage of rice hull ash is 20-40g, and the dosage of water is 30-60 g.

In a preferred embodiment of the present invention, step 4) may further include adding a water reducing agent and/or an early strength agent.

In a preferred embodiment, the water reducing agent is selected from calcium lignosulphonate and/or melamine.

The following will explain with specific examples.

Example 1

1) Mixing 100mL of absolute ethyl alcohol, 0.5mL of glacial acetic acid and 0.1mL of LKH550 silane coupling agent to obtain M1;

2) placing bentonite and wollastonite in a condition of 300 ℃ for roasting for 1h, then carrying out ball milling for 10min, and then adding 5g of nano calcium oxide, 10g of bentonite and 5g of wollastonite into M1 under the condition of pH 5 to obtain M2;

3) drying and grinding M2 to obtain M3;

4) 5g of the prepared M3, 100g of cement, 150g of aggregate, 10g of fly ash, 5g of alumina, 20g of rice hull ash, 30g of water and 3g of calcium lignosulfonate were mixed to prepare a chemical-erosion-resistant and highly durable concrete A1.

Example 2

1) Mixing 100mL of absolute ethyl alcohol, 2mL of glacial acetic acid and 1mL of LKH550 silane coupling agent to prepare M1;

2) placing bentonite and wollastonite in a temperature condition of 700 ℃ for roasting for 3h, then carrying out ball milling for 30min, and then adding 10g of nano calcium oxide, 30g of bentonite and 20g of wollastonite in M1 under the condition of pH 8 to obtain M2;

3) drying and grinding M2 to obtain M3;

4) 30g of the prepared M3, 100g of cement, 300g of aggregate, 30g of fly ash, 10g of alumina, 40g of rice hull ash, 60g of water and 3g of calcium lignosulfonate are mixed to prepare the chemical-erosion-resistant high-durability concrete A2.

Example 3

1) Mixing 100mL of absolute ethyl alcohol, 1mL of glacial acetic acid and 0.5mL of LKH550 silane coupling agent to prepare M1;

2) placing bentonite and wollastonite in a condition of 500 ℃ for roasting for 2h, then carrying out ball milling for 20min, and then adding 8g of nano calcium oxide, 20g of bentonite and 10g of wollastonite in M1 under the condition of pH 6 to obtain M2;

3) drying and grinding M2 to obtain M3;

4) 20g of the prepared M3, 100g of cement, 220g of aggregate, 20g of fly ash, 8g of alumina, 30g of rice hull ash, 45g of water and 3g of calcium lignosulfonate were mixed to prepare a chemical-erosion-resistant and highly durable concrete A3.

Example 4

Prepared as in example 1 except that bentonite and wollastonite were not calcined and ball milled to produce a chemically resistant highly durable concrete a 4.

Example 5

Prepared as in example 2 except that M3 was used in an amount of 3g, alumina was used in an amount of 3g, and rice husk ash was used in an amount of 10g, to obtain a chemically resistant highly durable concrete A5.

Comparative example 1

Prepared as in example 1 except that cement, aggregate, fly ash, alumina, rice hull ash and water were directly mixed to produce concrete B1.

Comparative example 2

Prepared as in example 2 except that no silane coupling agent, nano calcium oxide, was added to produce concrete B2.

Comparative example 3

Prepared as in example 3, except that no bauxite and rice husk ash were added, to produce concrete B3.

Test data

One group is taken to detect the compressive strength of 7d and 28d according to GB/T50081, the other group is taken to be soaked in a sodium sulfate solution with the concentration of 5 percent, the compressive strength of 7d and 28d is detected at the same time, the other group is taken to be soaked in a sulfuric acid solution with the concentration of 5 percent, the compressive strength of 7d and 28d is detected at the same time, and the results are shown in the following table.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The preparation method of the chemical-erosion-resistant high-durability concrete is characterized by comprising the following steps of:

3) drying and grinding M2 to obtain M3;

4) mixing the prepared M3, cement, aggregate, fly ash, alumina, rice hull ash and water to prepare chemical-erosion-resistant high-durability concrete;

the silane coupling agent in the step 1) is KH550 silane coupling agent;

in the step 2), before adding the nano calcium oxide, the bentonite and the wollastonite into the M1, roasting and ball-milling the bentonite and the wollastonite; the roasting temperature is 300-700 ℃, and the roasting time is 1-3 h; the ball milling time is 10-30 min;

in the steps 1) and 2), relative to 100mL of absolute ethyl alcohol, the dosage of glacial acetic acid is 0.5-2mL, the dosage of silane coupling agent is 0.1-1mL, the dosage of nano calcium oxide is 5-10g, the dosage of bentonite is 10-30g, and the dosage of wollastonite is 5-20 g;

in the step 4), relative to 100g of cement, the dosage of M3 is 5-30g, the dosage of aggregate is 150-300g, the dosage of fly ash is 10-30g, the dosage of alumina is 5-10g, the dosage of rice hull ash is 20-40g, and the dosage of water is 30-60 g;

adding a water reducing agent in the step 4); the water reducing agent is selected from calcium lignosulfonate and/or melamine.

2. A chemical-resistant high-durability concrete produced by the production method according to claim 1.