CN104072073A - Anti-erosion MEC maritime work cement-base composite material and preparation method thereof - Google Patents

Abstract

The invention relates to an anti-erosion MEC marine cement-based composite material and a manufacturing method, which is composed of 65%-75% of A component and 25%-35% of B component, and Portland cement clinker in A component The weight ratio of industrial waste slag to gypsum is 50-70 to 20-45 to 4-10, and the weight ratio of slag to slag to stone powder in component B is 93-96 to 1-3 to 2-4 to 0.5- 1. The preparation is that the two components A and B are finely ground respectively into powders with specific surface areas of 350-450m ² /kg and 420-480m ² /kg, and then mixed. Some of its raw materials use waste resources. The materials are easy to obtain and low in price, which is also conducive to environmental protection. It contains specific inorganic gelling materials. Through micronization technology and composite technology, the "potential activity" in the gelling material is stimulated, overcoming the high The shortcoming of low early strength of the mixed amount cement retains the advantages of high strength and good corrosion resistance in the later stage, and realizes reasonable particle gradation. The method is simple, easy to control, and the product quality is good.

Description

Corrosion-resistant MEC marine cement-based composite material and manufacturing method

technical field

The invention belongs to the technical field of special cement production, and in particular relates to an anti-corrosion MEC marine cement-based composite material and a manufacturing method.

Background technique

my country has a long coastline and vast saline-alkali land. Under the trend of human buildings expanding to the sea, the importance of concrete erosion research is particularly prominent. Major water transport projects such as the Donghai Bridge, Yangshan Deep-water Port and Hangzhou Bay Bridge are all facing erosion in seawater.

In marine engineering, chloride salt corrosion is the main cause of concrete damage in the world today. In our country, it has been found that the concrete beams and slabs of many seaports and wharves have been used for less than 10 years, and the reinforced concrete tendons are generally cracked and peeled off, and the steel bars are seriously corroded. Many overpass bridges in Beijing and Tianjin have also increasingly revealed serious problems of corrosion and damage to steel bars due to the spraying of ice salt in winter.

Contents of the invention

The purpose of the present invention is to provide an anti-corrosion MEC marine cement-based composite material with high post-strength, good corrosion resistance and easy-to-obtain materials.

Another object of the present invention is to provide a method for manufacturing an anti-erosion MEC marine cement-based composite material with simple method and easy control.

The technical solution for realizing the object of the present invention is: the anti-corrosion MEC marine cement-based composite material is composed of A component composed of Portland cement clinker, industrial waste residue and gypsum, and B component composed of active micropowder and reinforcing agent, In terms of weight percentage, component A is 65%-75% of the total weight, and component B is 25%-35% of the total weight. In component A, Portland cement clinker is 50% to industrial waste slag to gypsum. -70 to 20-45 to 4-10, the active micropowder in component B includes slag, slag and stone powder, and the weight parts of slag to slag to stone powder to reinforcing agent are 93-96 to 1-3 to 2-4 to 0.5 -1;

The anti-corrosion MEC marine cement-based composite material A component in the above can be 72%, and the B component can be 28%, wherein in the A component, Portland cement clinker is 60 parts by weight, and industrial waste residue is 35 parts , 5 parts of gypsum. In component B, 95 parts by weight of slag, 2 parts of slag, 2.2 parts of stone powder, and 0.8 parts of reinforcing agent;

The specific surface area of the anti-erosion MEC marine cement-based composite material mentioned above can be 350~450m ² /kg, and the specific surface area of B component can be 420~480m ² /kg;

Component B of the above-mentioned corrosion-resistant MEC marine cement-based composite material may contain the following substances: SiO _{2 ,} Al ₂ O ₃ , Fe ₂ O ₃ , CaO, MgO, and TiO ₂ .

The manufacturing method of the above-mentioned anti-corrosion MEC marine cement-based composite material is as follows: first, Portland cement clinker, industrial waste residue, and gypsum are jointly ground into a fine powder with a specific surface area of 350-450m ² /kg to form A component, Grind the active micropowder and reinforcing agent into a fine powder with a specific surface area of 420~480m ² /kg and mix to form component B, then take the formulated amount of component A and component B and fully mix to obtain the finished product;

In the above-mentioned manufacturing method of the anti-erosion MEC marine cement-based composite material, the mixing time of components A and B is controlled within 10 min to 60 min.

The corrosion-resistant MEC marine cement-based composite material of the present invention is composed of Portland cement clinker, industrial waste residue, gypsum, active micropowder and reinforcing agent in an appropriate proportion, and some raw materials use waste resources, and the materials are easy to obtain And the low price is also conducive to environmental protection. It contains specific inorganic cementitious materials. Through micronization technology and composite technology, the "potential activity" in the cementitious material is stimulated, and the shortcoming of low early strength of high-volume cement is overcome. It has the advantages of high strength and good corrosion resistance in the later stage, which can greatly improve the durability of concrete structures and prolong the service life of the project. In the preparation method, component A is pre-ground to a certain specific surface area, and then mixed with active micropowder B component ground by high-fine grinding equipment, which can achieve reasonable particle gradation. The method is simple and easy to control. Easy and good quality product. the

Detailed ways

The present invention will be further described below by the following examples, which will help to understand the present invention, but do not limit the content of the present invention.

Embodiment one

An anti-corrosion MEC marine cement-based composite material of the present invention has a specific proportion of 72% of component A and 28% of component B, wherein in component A, 60 parts by weight of Portland cement clinker, industrial waste residue 35 parts, 5 parts of gypsum. In component B, 95 parts by weight of slag, 2 parts of slag, 2.2 parts of stone powder, and 0.8 parts of reinforcing agent.

specific operation

First take the ingredients of the formula: Portland cement clinker 60Kg, industrial waste slag 35 Kg, gypsum 5 Kg and grind together until the specific surface area is 350~400m ² /kg as component A for use, then take slag 95 Kg, slag 2 Kg , 2.2Kg of stone powder, and 0.8Kg of reinforcing agent are ground into a fine powder with a specific surface area of 420~480m ² /kg and mixed to form B component, and then 72Kg of A component and 28 Kg of B component are fully mixed for 30 minutes.

Embodiment two

An anti-erosion MEC marine cement-based composite material of the present invention has a specific proportion of 65% of component A and 35% of component B, wherein in component A, Portland cement clinker is 70 parts by weight, industrial waste residue 20 parts, 10 parts of gypsum. In component B, by weight, 96 parts of slag, 1.5 parts of furnace slag, 2 parts of stone powder, and 0.5 part of reinforcing agent.

specific operation

First take the ingredients of the formula: Portland cement clinker 70Kg, industrial waste slag 20Kg, gypsum 10Kg and grind together until the specific surface area is 350~400m ² /kg as component A for use, then take slag 96 Kg, furnace slag 1.5 Kg, 2Kg of stone powder and 0.5Kg of reinforcing agent are ground into a fine powder with a specific surface area of 420~480m ² /kg and mixed to form B component, then 65Kg of A component and 35 Kg of B component are fully mixed for 60 minutes.

Embodiment three

An anti-erosion MEC marine cement-based composite material of the present invention has a specific proportion of 75% of component A and 25% of component B, wherein in component A, 50 parts by weight of Portland cement clinker, industrial waste residue 45 parts, 5 parts of gypsum. In component B, by weight, 93 parts of slag, 3 parts of slag, 3 parts of stone powder, and 1 part of reinforcing agent.

specific operation

First take the ingredients of the formula: Portland cement clinker 50Kg, industrial waste slag 45 Kg, gypsum 5 Kg and grind together until the specific surface area is 350~400m ² /kg as component A for use, then take 93 Kg of slag and 3 Kg of slag , 3Kg of stone powder, 1Kg of reinforcing agent, ground into a fine powder with a specific surface area of 420~480m ² /kg and mixed to form B component, then take 75Kg of A component and 25 Kg of B component and mix thoroughly for 10 minutes.

Embodiment four

An anti-erosion MEC marine cement-based composite material of the present invention has a specific proportion of 70% of component A and 30% of component B, wherein in component A, Portland cement clinker is 66 parts by weight, industrial waste residue 30 parts, 4 parts of gypsum. In component B, 94 parts by weight of slag, 1 part of slag, 4 parts of stone powder, and 1 part of reinforcing agent.

specific operation

First take the ingredients of the formula: Portland cement clinker 66Kg, industrial waste slag 30 Kg, gypsum 4 Kg and grind together until the specific surface area is 350~400m ² /kg as component A for use, then take 94 Kg of slag and 1 Kg of slag , 4Kg of stone powder, and 1Kg of reinforcing agent are ground into a fine powder with a specific surface area of 420~480m ² /kg and mixed to form B component, then 70Kg of A component and 30 Kg of B component are fully mixed for 20 minutes.

Test example:

Get the finished product sample test of above-mentioned embodiment 1, the result shows that anti-corrosion MEC marine cement-based composite material of the present invention is tested according to GB175 " general cement ", and the compressive strength of 3 days and 28 days is respectively 22～28MPa and 45.8～50.3 MPa, the impermeability is tested according to (GBJ82) "Test Method for Long-term Performance and Durability of Ordinary Concrete", and the impermeability grade reaches P12 or above; the coefficient of sulfate erosion resistance is tested according to GB/T 749 "Test Method for Sulfate Erosion Resistance of Cement". The corrosion coefficient is greater than 1.05; the resistance to chloride ion penetration is tested in accordance with ASTM1202 "Electric Indication Test Method for Concrete Resistance to Chloride Ion Permeation", and the soaking age of the specimen is less than 1000 coulombs for 56 days. The analysis and test components contain: SiO ₂ : 30~40%, Al ₂ O ₃ : 15~20%, Fe ₂ O ₃ : 3~8%, CaO: 38~42%, MgO: 1~5%, TiO ₂ : 0.3~0.7%.

The anti-corrosion MEC marine cement-based composite material of the present invention can be widely used in harbor projects and underground concrete structure projects, etc., greatly improving the durability of concrete structures and prolonging the service life of projects, and is a cementitious material for preparing high-performance concrete. It has the following characteristics:

1. High early strength The three-day strength of the anti-erosion MEC marine cement-based composite material can reach more than 55% of the 28-day strength, with three grades of 32.5, 42.5, and 52.5. Compared with Portland cement and ordinary Portland cement, it has higher early strength;

2. Good anti-corrosion performance The anti-corrosion MEC marine cement-based composite material has a sea erosion resistance coefficient K≥0.90. Has a strong ability to resist S0 ₄ , Mg, CI corrosion;

3. Good durability. Anti-corrosion MEC marine cement-based composite concrete cube is better than ordinary cement in compression, axial compression, splitting compression, steel corrosion resistance, freeze-drying shrinkage resistance, etc., and can be used with C30, C40 Concrete, C50, C60 pumpable, high-strength, corrosion-resistant concrete can be prepared with admixtures;

4. Good impermeability The anti-corrosion MEC marine cement-based composite material has micro-expansion characteristics, and a certain self-stress is generated inside the concrete, which enhances the compactness of the concrete, thereby improving the impermeability and crack resistance of the concrete. Using MEC marine cement to cast concrete with different strengths, the impermeability grade can reach P8-P12, which is obviously better than ordinary cement concrete;

5. Low heat of hydration The heat of hydration is one-third lower than that of ordinary cement, which is suitable for large-volume port concrete projects and dam projects.

6. Low-alkali and anti-corrosion MEC marine cement-based composite materials can make K ²⁺ and Na ²⁺ replace part of Ca ²⁺ during the hydration process and consolidate them into the CSH gel to reduce the alkali content and effectively prevent the alkali of concrete Orthopedic reaction. The alkali equivalent of R ₂ O+0.658K ₂ O in cement does not exceed 0.60%.

Claims (6)

1. An anti-erosion MEC marine cement-based composite material is characterized in that: it is composed of the A component composed of Portland cement clinker and industrial waste residue and gypsum, and the B component composed of active micropowder and reinforcing agent, In terms of weight percentage, component A is 65%-75% of the total weight, and component B is 25%-35% of the total weight. In component A, Portland cement clinker is 50% to industrial waste slag to gypsum. -70 to 20-45 to 4-10, the active micropowder in component B includes slag, slag and stone powder, and the weight parts of slag to slag to stone powder to reinforcing agent are 93-96 to 1-3 to 2-4 to 0.5 -1. 2. anti-corrosion MEC marine cement-based composite material according to claim 1, is characterized in that: A component is 72%, and B component is 28%, wherein Portland cement is in parts by weight in A component 60 parts of clinker, 35 parts of industrial waste residue, 5 parts of gypsum, 95 parts by weight of slag, 2 parts of furnace slag, 2.2 parts of stone powder and 0.8 part of reinforcing agent in component B. 3. The anti-erosion MEC marine cement-based composite material according to claim 1 or 2, characterized in that: the specific surface area of component A is 350-450m ² /kg, and the specific surface area of component B is 420-480m ² /kg. 4. The anti-corrosion MEC marine cement-based composite material according to claim 3, characterized in that component B contains the following substances: SiO _{2 ,} Al ₂ O ₃ , Fe ₂ O ₃ , CaO, MgO, TiO ₂ . 5. The manufacturing method of anti-corrosion MEC marine cement-based composite material as claimed in claim 4, characterized in that: Portland cement clinker, industrial waste slag, and gypsum are firstly ground together so that the specific surface area is 350 ~ 450m ² /kg fine powder to form A component, grind the active micropowder and reinforcing agent into a fine powder with a specific surface area of 420~480m ² /kg and mix to form B component, then take the formula amount of A and B components and mix thoroughly That is the finished product. 6. The manufacturing method of the anti-erosion MEC marine cement-based composite material according to claim 5, characterized in that: the mixing time of the components A and B is controlled within 10 min to 60 min.