CN102126849A - Dry mixed mortar - Google Patents

Abstract

The invention relates to a common dry-mixed mortar in the field of building material mortar. Ferroalloy slag artificial sand modified by alkaline modification liquid is used as raw material, and the weight ratio of each raw material is Portland cement: coarse sand: medium sand: fine sand: fly ash or tuff fine powder or a mixture of both: slag powder Or steel slag powder or a mixture of the two: cellulose ether=8～25:0～40:10～40:10～40:5～10:5～10:0.03. The above-mentioned powdery or granular materials are weighed according to a certain weight ratio, and after they are evenly mixed in the dry-mixed mortar production line, they can be made into dry-mixed masonry mortar, dry-mixed plastering mortar, and dry-mixed floor mortar of various labels. The invention can realize the comprehensive utilization of industrial waste residues, solve the problems of farmland occupation and environmental pollution, and achieve the national economic development goals of building resource-saving, environment-friendly and realizing sustainable development.

Description

a dry mix mortar

technical field

The invention relates to the technical field of building material mortar, in particular to a dry-mixed mortar prepared by using ferroalloy slag.

Background technique

The main raw materials for the production of dry-mixed mortar are: cement, lime, gypsum, fly ash, slag powder, sand, admixtures, etc. At present, the aggregates in dry-mixed mortar mainly use natural sand, which is a non-renewable local resource. With the increasing development of national infrastructure construction, natural sand resources have gradually decreased in many areas of our country, or even no natural sand resources. Therefore, artificial sand prepared from industrial waste residues instead of natural sand is an important way to produce dry-mixed mortar.

Ferroalloy slag is industrial waste slag produced during ferroalloy smelting. According to the different types of ferroalloy produced, ferroalloy slag can be divided into ferromanganese alloy slag, ferrosilicon alloy slag, ferrochromium alloy slag, stainless steel slag, etc. Ferroalloy slag is naturally cooled in the air or cooled by a small amount of water to form a stone material with large bulk density and blockiness, which is gray or gray black, similar to natural basaltic or granite lava, with a certain number of pores inside Different pores, high hardness and high strength. This large block of stoney waste slag is slowly cooled during discharge to form a relatively stable crystalline structure. Its main minerals are calcium aluminum feldspar, magnesian feldspar, anorthite, calcium sulfide, dicalcium silicate and a large amount of vitreous body. Except for dicalcium silicate and vitreous body which have slow hydraulic hardening and potential activity, other minerals have stable structure and poor hydraulic hardness at room temperature. The chemical composition of ferroalloy slag is mainly: SiO ₂ , Al ₂ O ₃ , CaO, MgO, Fe ₂ O ₃ , SiO ₂ , Al ₂ O ₃ , CaO and other components. Alkali is used to excite SiO ₂ , Al ₂ O ₃ and other components in the glass phase to break the Si-O and Al-O bonds and generate silicate and aluminate plasma, which is beneficial to the combination with the cementitious material, shortens the setting time, and improves Strength, so ferroalloy slag is an ideal aggregate for dry-mixed mortar.

The Chinese invention patent application number filed by the applicant in January 2011 is 201110009379.9, titled "A Preparation Method for Artificial Sand", which discloses an alkaline modification liquid modification method for ferroalloy slag artificial sand. Ferroalloy slag Sand grains with a particle size of 0.1~5mm are made, and the sand grains are modified by alkaline modification solution and dried to make artificial sand. The preferred concentration of the alkaline modification solution is 0.05~0.2wt%, the solute is Ca(OH) ₂ and NaOH, the weight ratio of the two is 5~15:2~5, and the solvent is water. Preferably, the alkaline modification solution also includes 0.02wt% sodium silicate. Preferably, the weight ratio of sand grains to alkaline modification solution is 1:1. Modification is carried out by spraying alkaline modification liquid on the sand particles. Spray the alkaline modifier several times on the sand particles. The prepared artificial sand is used after particle size classification. It solves the phenomenon of redness after ferroalloy slag artificial sand is made into mortar, and enhances the mechanical properties of mortar to a certain extent. However, the performance of ferroalloy slag artificial sand modified by alkaline modifying liquid still has a lot of room for excavation.

Contents of the invention

In order to further excavate the properties of ferroalloy slag artificial sand modified by alkaline modifying liquid, the ferroalloy slag artificial sand that has been treated by alkaline modifying liquid is used instead of natural sand as raw material to produce ordinary dry-mixed mortar. The main raw materials are: Ferroalloy slag artificial sand, cement, fly ash, slag micropowder, tuff micropowder, and steel slag micropowder have obtained mortar products with better performance.

The present invention is achieved through the following measures:

A dry mix mortar comprising the following components:

Portland cement, ferroalloy slag artificial sand, fly ash or tuff fine powder or a mixture of both, slag fine powder or steel slag fine powder or a mixture of both, cellulose ether;

The ferroalloy slag artificial sand is modified by alkaline modifying liquid, and can be divided into coarse sand, medium sand, fine sand, slag micropowder, tuff micropowder and The specific surface area of steel slag fine powder is 400~500 m ² /kg,

The parts by weight that each component occupies are:

8-25 parts of Portland cement, 0-40 parts of coarse sand, 10-40 parts of medium sand, 10-40 parts of fine sand,

5-10 parts of fly ash or tuff fine powder or the mixture of both, 5-10 parts of slag fine powder or steel slag fine powder or the mixture of both, 0.03 part of cellulose ether.

Described dry-mixed mortar, the parts by weight that each component occupies are as follows:

8-12 parts of Portland cement, 20-30 parts of coarse sand, 10-20 parts of medium sand, 25-35 parts of fine sand,

5-10 parts of fly ash or tuff fine powder or a mixture of the two,

5-10 parts of slag fine powder or steel slag fine powder or a mixture of both, 0.03 part of cellulose ether.

Described dry-mixed mortar, the parts by weight that each component occupies are as follows:

10-17 parts of Portland cement, 30-40 parts of medium sand, 35-40 parts of fine sand,

5-10 parts of fly ash or tuff fine powder or a mixture of the two,

5-10 parts of slag fine powder or steel slag fine powder or a mixture of both, 0.03 part of cellulose ether.

Described dry-mixed mortar, the parts by weight that each component occupies are as follows:

12-25 parts of Portland cement, 20-40 parts of coarse sand, 20-35 parts of medium sand, 20-30 parts of fine sand,

5-10 parts of fly ash or tuff fine powder or a mixture of the two,

5-10 parts of slag fine powder or steel slag fine powder or a mixture of both, 0.03 part of cellulose ether.

The 2% aqueous solution of cellulose ether has a viscosity of 100,000-150,000 centipoise at 20°C.

The dry-mixed mortar also includes 3 parts by weight of redispersible latex powder.

The concentration of the alkaline modification solution is 0.05-0.2 wt%, wherein the solute is Ca(OH) ₂ and NaOH, the weight ratio of the two is 5-15:2-5, and the solvent is water.

The dry-mixed mortar is characterized in that the alkaline modification liquid also includes 0.02wt% sodium silicate.

The dry-mixed mortar is characterized in that the weight ratio of the ferroalloy slag artificial sand to the alkaline modification liquid is 1:1.

Fly ash is the fine ash collected from the flue gas after coal combustion. Fly ash is the main solid waste discharged from coal-fired power plants. The main oxide composition of fly ash in thermal power plants in China is: SiO ₂ , Al ₂ O ₃ , FeO, Fe ₂ O ₃ , CaO, TiO ₂ and so on.

The ore residue after refining is called slag, which can be blended in cement and added to commercial concrete. The equivalent amount of slag micropowder can replace the amount of cement in concrete and cement products for various purposes, which can significantly improve the comprehensiveness of concrete and cement products. performance.

Tuff is a kind of pyroclastic rock, mainly composed of volcanic ash, loose and porous in appearance, rough, with bedding, and various colors, including black, purple, red, white, light green, etc., which can improve the mechanical strength.

Steel slag, a kind of industrial solid waste, slag discharged from steelmaking, can be divided into converter slag, open hearth furnace slag and electric furnace slag according to the furnace type. Steel slag is mainly composed of oxides of calcium, iron, silicon, magnesium and a small amount of aluminum, manganese, phosphorus, etc. The main mineral phases are solid solutions formed by tricalcium silicate, dicalcium silicate, calcium magnesium olivine, calcium magnesium rhodoxene, calcium aluminate ferrite, and oxides of silicon, magnesium, iron, manganese, and phosphorus. Contains a small amount of free calcium oxide, metallic iron, fluoroapatite, etc.

Redispersible latex powder products are water-soluble redispersible powders, which are ethylene/vinyl acetate copolymers, vinyl acetate/ethylene tertiary carbonic acid copolymers, acrylic acid copolymers, etc., with polyvinyl alcohol as a protective colloid. High bonding capacity and unique properties.

The tuff micropowder and steel slag micropowder raw materials can partially or completely replace fly ash and slag micropowder. Both have a specific surface area of 400-500 m ² /kg.

Beneficial effects of the present invention:

1. The artificial sand made of ferroalloy slag can not only replace natural bluestone sand and quartz sand, but also has the properties of small bulk density and increasing strength in the later stage; at the same time, the mortar is more suitable for high temperature and high pressure steam curing environment. Superior compression performance;

2. Ferroalloy slag-made artificial sand is added in an amount of 50-75% in ordinary dry-mixed mortar, completely replacing natural bluestone sand and quartz sand. Taking the annual output of 500,000 tons of ordinary dry-mixed mortar as an example, 250,000 to 350,000 tons of accumulated smelting waste can be consumed, reducing the consumption of natural resources;

3. Ferroalloy slag mechanism artificial sand is used to produce ordinary dry-mixed mortar. Due to its high content, the production cost of dry-mixed mortar is reduced by 10-20 yuan per ton, which improves economic benefits;

4. The specific surface area of the slag powder, tuff powder and steel slag powder used is strictly controlled, so that the filling enhancement effect can achieve a better effect;

5. Realize the comprehensive utilization of industrial waste residues, solve the problems of farmland occupation and environmental pollution, and achieve the national economic development goals of building a resource-saving, environment-friendly and sustainable development.

Detailed ways

In order to better understand the present invention, it will be further described below in conjunction with specific examples.

Example 1:

A dry-mixed masonry mortar, the weight ratio of the mortar is: cement: coarse sand: medium sand: fine sand: fly ash: steel slag powder: cellulose ether = 10:25:18:30:8:9:0.03 , The viscosity of a 2% aqueous solution of cellulose ether at 20°C is 100,000 centipoise. The cement is 32.5 ^# ordinary Portland cement produced by Shandong Shanshui Cement Group, and the fly ash is the secondary ash discharged from Jinan Huangtai Power Plant. The above-mentioned materials are mixed and stirred evenly on the dry-mixed mortar production line of Jinan Yongquan New Building Materials Co., Ltd. according to their weight ratios, and the dry-mixed masonry mortar labeled DMM15 is made.

The properties of the tested mortar are shown in Table 1.

Example 2:

A dry-mixed plastering mortar, the weight ratio of the mortar is: cement: medium sand: fine sand: tuff powder: slag powder: cellulose ether = 12: 35: 37: 8: 8: 0.03, cellulose ether 2% The aqueous solution has a viscosity of 150,000 centipoise at 20°C. The cement is 32.5 ^# ordinary Portland cement produced by Shandong Shanshui Cement Group, and the slag powder is produced by Jinan Yongquan New Building Materials Co., Ltd. The above-mentioned materials are mixed and stirred evenly on the dry-mixed mortar production line of Jinan Yongquan New Building Materials Co., Ltd. according to their weight ratios, and the dry-mixed plastering mortar labeled DPM15 is made.

The properties of the tested mortar are shown in Table 1.

Example 3:

A dry-mixed floor mortar, the weight ratio of the mortar is: cement: coarse sand: medium sand: fine sand: fly ash: slag powder: tuff fine powder: steel slag fine powder: cellulose ether=20:20:25:20 : 4: 3: 4: 4: 0.03, the viscosity of 2% aqueous solution of cellulose ether is 110000 centipoise at 20 ℃. The cement is 32.5 ^# ordinary Portland cement produced by Shandong Shanshui Cement Group, the fly ash is the secondary ash discharged from Jinan Huangtai Power Plant, and the slag powder is produced by Jinan Yongquan New Building Materials Co., Ltd. The above-mentioned materials are mixed and stirred evenly on the dry-mixed mortar production line of Jinan Yongquan New Building Materials Co., Ltd. according to their weight ratios, and the dry-mixed floor mortar labeled DSM20 is made.

The properties of the tested mortar are shown in Table 1.

Example 4:

A dry-mixed masonry mortar, the weight ratio of which is: cement: coarse sand: medium sand: fine sand: fly ash: slag powder: tuff fine powder: steel slag fine powder: cellulose ether=8:30:10:10 : 3: 7: 2: 8: 0.03, the viscosity of 2% aqueous solution of cellulose ether is 120000 centipoise at 20 ℃. The cement is 32.5 ^# ordinary Portland cement produced by Shandong Shanshui Cement Group, and the fly ash is the secondary ash discharged from Jinan Huangtai Power Plant. The above-mentioned materials are mixed and stirred evenly on the dry-mixed mortar production line of Jinan Yongquan New Building Materials Co., Ltd. according to their weight ratios, and the dry-mixed masonry mortar labeled DMM15 is made.

The properties of the tested mortar are shown in Table 1.

Example 5:

A dry-mixed floor mortar, the weight ratio of the mortar is: cement: coarse sand: medium sand: fine sand: slag powder: tuff powder: cellulose ether = 25: 40: 20: 20: 5: 5: 0.03, A 2% aqueous solution of cellulose ether has a viscosity of 130,000 centipoise at 20°C. The cement is 32.5 ^# ordinary Portland cement produced by Shandong Shanshui Cement Group, the fly ash is the secondary ash discharged from Jinan Huangtai Power Plant, and the slag powder is produced by Jinan Yongquan New Building Materials Co., Ltd. The above-mentioned materials are mixed and stirred evenly on the dry-mixed mortar production line of Jinan Yongquan New Building Materials Co., Ltd. according to their weight ratios, and the dry-mixed floor mortar labeled DSM20 is made.

The properties of the tested mortar are shown in Table 1.

Embodiment 6:

A dry-mixed floor mortar, the weight ratio of the mortar is: cement: coarse sand: medium sand: fine sand: fly ash: slag powder: tuff fine powder: steel slag fine powder: cellulose ether: redispersible latex powder = 20 : 20: 25: 20: 4: 3: 4: 4: 0.03: 3, the viscosity of 2% aqueous solution of cellulose ether is 110000 centipoise at 20 ℃. The cement is 32.5 ^# ordinary Portland cement produced by Shandong Shanshui Cement Group, the fly ash is the secondary ash discharged from Jinan Huangtai Power Plant, and the slag powder is produced by Jinan Yongquan New Building Materials Co., Ltd. The above materials are mixed and stirred evenly on the dry-mixed mortar production line of Jinan Yongquan New Building Materials Co., Ltd. according to their weight ratios to make dry-mixed floor mortar.

The properties of the tested mortar are shown in Table 1.

Table 1 Comparison table of mortar properties prepared in Examples 1-6

Autoclave conditions are: after reaching the corresponding age, use steam with a pressure of 2.0MPa, and measure its strength after autoclaving for 6 hours.

Analysis Examples 1 to 6 use ferroalloy slag artificial sand as raw material to prepare dry-mixed masonry mortar, dry-mixed plastering mortar and dry-mixed floor mortar with excellent performance, especially under the condition of high temperature and high pressure steam curing for 7 days, The 28-day compressive strength is superior. All the performance indexes of the ordinary dry-mixed mortar prepared by each implementation example exceed the requirements of the ordinary dry-mixed mortar industry standard. Compared with Example 3, Example 6 only added 3 more parts of redispersible rubber powder, but the setting time was shortened by 0.67 hours, the water retention rate increased by one percentage point, and the compressive strength and autoclaved strength were greatly improved. , indicating that the use of redispersible latex powder in this system can achieve better results.

The redispersible latex powder is dispersed and formed into a film as the second adhesive to play a reinforcing role. The protective colloid is absorbed by the mortar system and will not be destroyed by water after the film is formed. The polymer resin formed into the film is distributed as a reinforcing material in the entire mortar system. , thereby increasing the cohesion of the mortar, improving construction performance, improving flow performance, increasing thixotropy and sag resistance, improving cohesion; prolonging the opening time and enhancing water retention. The role of redispersible latex powder after the mortar is cured: increase the tensile strength, increase the bending strength, reduce the elastic modulus, improve the deformability, increase the material density, increase the wear resistance, increase the cohesive strength, reduce The depth of carbonization reduces the water absorption of the material.

Claims (9)

1. dry-mixed mortar is characterized in that comprising following component:

Silicate cement, ferro-alloy cinder artificial sand, flyash or tuff micro mist or both mixtures, slag micropowder or slag micro powder or both mixtures, ether of cellulose; Described ferro-alloy cinder artificial sand is through the modification of parlkaline modification liquid, is divided into coarse sand, medium sand, fine sand according to particle size range 5 ~ 2.5mm, 2.49 ~ 1mm, 0.99 ~ 0.1mm, and the specific surface area of slag micropowder, tuff micro mist and slag micro powder is 400 ~ 500 m ²/ kg,

The shared weight part of each component is:

8～25 parts of silicate cements, 0～40 part of coarse sand, 10～40 parts of medium sands, 10～40 parts of fine sands,

5～10 parts in flyash or tuff micro mist or both mixtures, 5～10 parts in slag micropowder or slag micro powder or both mixtures, 0.03 part of ether of cellulose.

2. dry-mixed mortar according to claim 2 is characterized in that the weight part of each component is as follows:

8～12 parts of silicate cements, 20～30 parts of coarse sands, 10～20 parts of medium sands, 25～35 parts of fine sands,

5～10 parts in flyash or tuff micro mist or both mixtures,

5～10 parts in slag micropowder or slag micro powder or both mixtures, 0.03 part of ether of cellulose.

3. dry-mixed mortar according to claim 2 is characterized in that the weight part of each component is as follows:

10～17 parts of silicate cements, 30～40 parts of medium sands, 35～40 parts of fine sands,

5～10 parts in flyash or tuff micro mist or both mixtures,

5～10 parts in slag micropowder or slag micro powder or both mixtures, 0.03 part of ether of cellulose.

4. dry-mixed mortar according to claim 2 is characterized in that the weight part of each component is as follows:

12～25 parts of silicate cements, 20～40 parts of coarse sands, 20～35 parts of medium sands, 20～30 parts of fine sands,

5～10 parts in flyash or tuff micro mist or both mixtures,

5～10 parts in slag micropowder or slag micro powder or both mixtures, 0.03 part of ether of cellulose.

5. dry-mixed mortar according to claim 1 is characterized in that the aqueous solution of ether of cellulose 2% is 100000 ~ 150000 centipoises 20 ℃ of viscosity.

6. according to claim 2 or 3 or 4 described dry-mixed mortars, it is characterized in that also comprising the redispersable latex powder of 3 weight parts.

7. dry-mixed mortar according to claim 1 is characterized in that described alkaline modification liquid concentration is 0.05 ~ 0.2wt%, and wherein solute is Ca (OH) ₂And NaOH, both weight ratios are 5 ~ 15:2 ~ 5, solvent is a water.

8. dry-mixed mortar according to claim 7 is characterized in that described alkaline modification liquid also comprises the water glass of 0.02wt%.

9. according to claim 1 or 7 described dry-mixed mortars, the weight ratio that it is characterized in that described ferro-alloy cinder artificial sand and alkaline modification liquid is 1:1.