CN116177976A - Calcination-free desulfurization gypsum dry-mixed mortar and preparation method thereof - Google Patents

Abstract

The invention discloses calcination-free desulfurized gypsum dry-mixed mortar which is prepared from the following raw materials in parts by weight at normal temperature: 10-13 parts of calcination-free desulfurized gypsum; 7-17 parts of concrete cementing material; 40-75 parts of concrete coarse aggregate; 2-6 parts of an exciting agent; 0.5-1 part of modifier; 0.07-0.1 part of water-retaining agent; 0.1-1 part of hydrophobizing agent; 0.3-0.5 part of anticracking agent; 20-26 parts of fine aggregate; 3-5 parts of solid phase binder; 10-15 parts of expanded perlite, adopting calcination-free desulfurized gypsum and concrete cementing material as main materials, adding solid phase binder high polymer to improve the performance of the final product, enhancing the effects of heat preservation, heat insulation, aging resistance and high and low temperature resistance of mortar, ensuring the quality of the product, being suitable for wide popularization, adopting the mixture of polyvinyl alcohol, copper sulfate powder, powder asphalt and naphthalene water reducer as modifier, the polyvinyl alcohol has the functions of regulating coagulation and preserving water, the powder asphalt can improve the water resistance of the material, the naphthalene water reducer can reduce the water consumption, and the compression resistance and the breaking strength are improved.

Description

Calcination-free desulfurization gypsum dry-mixed mortar and preparation method thereof

technical field

The invention relates to the field of dry-mixed mortar, in particular to a non-calcined desulfurized gypsum dry-mixed mortar and a preparation method thereof.

Background technique

Wall (inner wall, outer wall) plastering dry-mixed mortar is an important part of construction engineering.

In the prior art, dry-mixed mortar for wall plastering is mainly prepared by the following methods: first, direct use of natural hemihydrate gypsum for production; It is formulated with additives such as coagulation and water retention and aggregates such as quartz sand. On the one hand, as a natural resource, natural hemihydrate gypsum has less and less storage capacity; on the other hand, using industrial desulfurization by-product dihydrate desulfurization gypsum to be calcined into hemihydrate gypsum will cause environmental pollution, and there are huge supporting facilities , Insufficient investment and so on. The production cost of wall plastering dry-mixed mortar also remains high because of the above-mentioned reasons.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a non-calcined desulfurized gypsum dry-mixed mortar and its preparation method. The environmentally friendly preparation method of a dry-mixed mortar provided by the present invention uses calcined-free desulfurized gypsum and concrete cementitious materials as the main material, and adding solid phase binder high polymer improves the performance of the final product, enhances the effect of heat preservation, heat insulation, anti-aging, high and low temperature resistance of the mortar, ensures product quality, is suitable for wide promotion, and uses polyvinyl alcohol , copper sulfate powder, powdered asphalt, and a mixture of naphthalene-based water reducers are used as modifiers. Polyvinyl alcohol has the functions of adjusting coagulation and water retention. Powdered asphalt can improve the waterproof performance of materials. Naphthalene-based water reducers can reduce water consumption and improve Compressive and flexural strength.

In order to solve the above-mentioned technical problems, the present invention provides the following technical proposal: a dry-mixed mortar of non-calcined desulfurized gypsum, prepared from the following raw materials at room temperature by weight ratio, including: 10-13 parts of non-calcined desulfurized gypsum; 7-17 parts of material; 40-75 parts of concrete coarse aggregate; 2-6 parts of activator; 0.5-1 part of modifier; 0.07-0.1 part of water-retaining agent; 20-26 parts of fine aggregate; 3-5 parts of solid phase binder; 10-15 parts of expanded perlite.

As a preferred technical solution of the present invention, the water-retaining agent is selected from methyl cellulose, hydroxypropyl methyl cellulose, cyanoethyl cellulose, benzyl cyanoethyl cellulose, carboxymethyl hydroxyethyl One or more of cellulose, phenyl cellulose or modified starch.

As a preferred technical solution of the present invention, the concrete cementitious material is an inorganic cementitious material, including one of cement and fly ash.

As a preferred technical solution of the present invention, the activator is prepared by weight ratio at normal temperature from the following reagents: calcium oxide powder 80%, sodium sulfate powder 20%, and the modifying agent is prepared from the following reagents at normal temperature It is formulated according to the weight ratio: 30% of water reducer, 50% of powdered asphalt, 16% of polyvinyl alcohol, and 4% of copper sulfate powder.

As a preferred technical solution of the present invention, the content of calcium sulfate dihydrate in the calcined-free desulfurization gypsum is not less than 90%.

As a preferred technical solution of the present invention, the water-retaining agent is selected from one or more of methyl cellulose and cyanoethyl cellulose; the anti-crack agent is selected from steel fibers, asbestos fibers, glass fibers, and PP fibers. one or several.

A method for preparing non-calcined desulfurized gypsum dry-mixed mortar, comprising the following steps:

S1. Raw materials are weighed, and the concrete coarse aggregate, fine aggregate, calcined-free desulfurization gypsum, concrete cementitious material, modifier, water-retaining agent, hydrophobic agent, anti-cracking agent and solid phase binder are quantified according to the component ratio Weigh for spare;

S2: Raw material processing, wash the concrete coarse aggregate, fine aggregate, and non-calcined desulfurization gypsum in S1, and dry them for standby;

S3: crushing, put the dried concrete coarse aggregate, fine aggregate, and non-calcined desulfurization gypsum in S2 into the crusher for crushing, control the crushing particle size at 10mm-20mm, and use it after crushing

S4: Main material grinding, pour the broken raw materials in S3 into the grinder for grinding, control the particle size at 3mm-5mm, the speed of the grinding disc is 60-130 rpm, and sieve out 3mm- 5mm raw material, obtain grinding raw material for subsequent use;

S5: Grinding of auxiliary materials, put the expanded perlite in S1 into a ball mill for grinding, control the size of the ground particles to 0.5mm-1mm, control the speed of the ball mill at 25-30 rpm, and use the obtained aggregate for later use ;

S6: Pulverize, pour the exciter, modifier, water retaining agent, hydrophobic agent, and anti-cracking agent in S1 into a pulverizer for pulverization, and set aside;

S7: One-time mixing, pour the raw materials obtained in S4 into the mixer, then pour the concrete cementitious material and solid-phase binder into the mixer and mix, control the mixing time at 10-20min, and the mixer speed at 120-200 rpm, Obtain raw materials for use;

S8, secondary mixing, pour the mixed raw materials obtained in S7 into the high-speed mixer, then pour the raw materials in S5, the high polymer in S1 and the admixture in S6 into the high-speed mixer, stir and mix, and control The rotation speed of the mixer is 300-500 rpm, and the mixing time is 10-20 minutes to obtain dry-mixed mortar.

Compared with prior art, the beneficial effect that the present invention can reach is:

1. The invention provides an environmentally friendly preparation method for dry-mixed mortar, which uses calcined-free desulfurized gypsum and concrete cementitious materials as main ingredients, and adds solid-phase binder high polymer to improve the performance of the final product and enhance the mortar’s durability. The effects of heat preservation, heat insulation, anti-aging, and high and low temperature resistance ensure product quality and are suitable for widespread promotion.

2. The present invention uses a mixture of polyvinyl alcohol, copper sulfate powder, powder pitch, and naphthalene-based water reducer as a modifier. Water agent can reduce water consumption and improve compressive and flexural strength.

Description of drawings

Fig. 1 is a structural block diagram of the preparation method of the present invention.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the examples in the implementation manners, other examples obtained by those skilled in the art without making creative efforts all belong to the protection scope of the present invention. The experimental methods in the following examples, unless otherwise specified, are conventional methods, and the materials, reagents, etc. used in the following examples, unless otherwise specified, can be obtained from commercial sources.

Embodiment one:

As shown in Figure 1, the present invention provides a non-calcined desulfurized gypsum dry-mixed mortar, which is prepared by weight ratio from the following raw materials at room temperature, including: 10-13 parts of non-calcined desulfurized gypsum; 7-17 parts of concrete cementitious materials 40-75 parts of concrete coarse aggregate; 2-6 parts of activator; 0.5-1 part of modifier; 0.07-0.1 part of water-retaining agent; 0.1-1 part of hydrophobic agent; 20-26 parts of material; 3-5 parts of solid phase binder; 10-15 parts of expanded perlite.

In other embodiments, the water retaining agent is selected from methylcellulose, hydroxypropylmethylcellulose, cyanoethylcellulose, benzylcyanoethylcellulose, carboxymethylhydroxyethylcellulose and phenylcellulose Or one or more of modified starches.

In other embodiments, the concrete cementitious material is an inorganic cementitious material, including one of cement and fly ash.

In other embodiments, the activator is prepared by weight ratio at normal temperature from the following reagents: 80% calcium oxide powder, 20% sodium sulfate powder, and the modifier is prepared by weight ratio from the following reagents at normal temperature: 30% water reducing agent, 50% powdered asphalt, 16% polyvinyl alcohol, 4% copper sulfate powder.

In other embodiments, the content of calcium sulfate dihydrate in the calcined-free desulfurization gypsum is not less than 90%.

In other embodiments, the water-retaining agent is selected from one or more of methyl cellulose and cyanoethyl cellulose; the anti-crack agent is selected from one or more of steel fiber, asbestos fiber, glass fiber, and PP fiber. kind.

A method for preparing non-calcined desulfurized gypsum dry-mixed mortar, comprising the following steps:

S1. Raw materials are weighed, and the concrete coarse aggregate, fine aggregate, calcined-free desulfurization gypsum, concrete cementitious material, modifier, water-retaining agent, hydrophobic agent, anti-cracking agent and solid phase binder are quantified according to the component ratio Weigh for spare;

S2: Raw material processing, wash the concrete coarse aggregate, fine aggregate, and non-calcined desulfurization gypsum in S1, and dry them for standby;

S3: crushing, put the dried concrete coarse aggregate, fine aggregate, and non-calcined desulfurization gypsum in S2 into the crusher for crushing, control the crushing particle size at 10mm-20mm, and use it after crushing

S4: Main material grinding, pour the broken raw materials in S3 into the grinder for grinding, control the particle size at 3mm-5mm, the speed of the grinding disc is 60-130 rpm, and sieve out 3mm- 5mm raw material, obtain grinding raw material for subsequent use;

S5: Grinding of auxiliary materials, put the expanded perlite in S1 into a ball mill for grinding, control the size of the ground particles to 0.5mm-1mm, control the speed of the ball mill at 25-30 rpm, and use the obtained aggregate for later use ;

S6: Pulverize, pour the exciter, modifier, water retaining agent, hydrophobic agent, and anti-cracking agent in S1 into a pulverizer for pulverization, and set aside;

S7: One-time mixing, pour the raw materials obtained in S4 into the mixer, then pour the concrete cementitious material and solid-phase binder into the mixer and mix, control the mixing time at 10-20min, and the mixer speed at 120-200 rpm, Obtain raw materials for use;

S8, secondary mixing, pour the mixed raw materials obtained in S7 into the high-speed mixer, then pour the raw materials in S5, the high polymer in S1 and the admixture in S6 into the high-speed mixer, stir and mix, and control The rotation speed of the mixer is 300-500 rpm, and the mixing time is 10-20 minutes to obtain dry-mixed mortar.

Embodiment two:

This embodiment provides a non-calcining desulfurization gypsum dry-mix mortar, which is prepared by weight ratio from the following raw materials at room temperature, including: 10-13 parts of non-calcining desulfurization gypsum; 7-17 parts of concrete cementitious material; concrete coarse bone 40-75 parts of material; 2-6 parts of activator; 0.5-1 part of modifier; 0.1-1 part of hydrophobic agent; 0.3-0.5 part of anti-cracking agent; share.

In other embodiments, the concrete cementitious material is an inorganic cementitious material, including one of cement and fly ash.

In other embodiments, the activator is prepared by weight ratio at normal temperature from the following reagents: 80% calcium oxide powder, 20% sodium sulfate powder, and the modifier is prepared by weight ratio from the following reagents at normal temperature: 30% water reducing agent, 50% powdered asphalt, 16% polyvinyl alcohol, 4% copper sulfate powder.

In other embodiments, the content of calcium sulfate dihydrate in the calcined-free desulfurization gypsum is not less than 90%.

In other embodiments, the anti-cracking agent is selected from one or more of steel fibers, asbestos fibers, glass fibers, and PP fibers.

In this embodiment, there is also a method for preparing a calcined-free desulfurized gypsum dry-mixed mortar, which includes the following steps:

S1. Weighing raw materials, quantitatively weighing concrete coarse aggregate, fine aggregate, non-calcined desulfurization gypsum, concrete cementitious material, modifier, hydrophobic agent, and anti-cracking agent according to the component ratio;

S2: Raw material processing, wash the concrete coarse aggregate, fine aggregate, and non-calcined desulfurization gypsum in S1, and dry them for standby;

S3: crushing, put the dried concrete coarse aggregate, fine aggregate, and non-calcined desulfurization gypsum in S2 into the crusher for crushing, control the crushing particle size to 10mm-20mm, and set aside after the crushing is completed;

S4: Main material grinding, pour the broken raw materials in S3 into the grinder for grinding, control the particle size at 3mm-5mm, the speed of the grinding disc is 60-130 rpm, and sieve out 3mm- 5mm raw material, obtain grinding raw material for subsequent use;

S5: Grinding of auxiliary materials, put the expanded perlite in S1 into a ball mill for grinding, control the size of the ground particles to 0.5mm-1mm, control the speed of the ball mill at 25-30 rpm, and use the obtained aggregate for later use ;

S6: Pulverize, pour the activator, modifier, hydrophobic agent, and anti-cracking agent in S1 into a pulverizer for pulverization, and set aside;

S7: One-time mixing, pour the raw materials obtained in S4 into the mixer, and then pour the concrete cementitious material into the mixer for mixing, control the mixing time at 10-20min, and the mixer speed at 120-200 rpm, and obtain the raw materials for later use;

S8, secondary mixing, pour the mixed raw materials obtained in S7 into the high-speed mixer, then pour the raw materials in S5, the high polymer in S1 and the admixture in S6 into the high-speed mixer, stir and mix, and control The rotation speed of the mixer is 300-500 rpm, and the mixing time is 10-20 minutes to obtain dry-mixed mortar.

In this example, compared with Example 1, this example does not add water retaining agent and solid-phase binder. In contrast to Example 1, after following the same steps, the water absorption performance of the mortar is poor, and the water retention The effect is not as good as that of the comparative example one.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and those described in the above-mentioned embodiments and description are only preferred examples of the present invention, and are not intended to limit the present invention, without departing from the spirit and scope of the present invention. Under the premise, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. A calcination-free desulfurized gypsum dry-mixed mortar is characterized in that: the material is prepared from the following raw materials in parts by weight at normal temperature: 10-13 parts of calcination-free desulfurized gypsum; 7-17 parts of concrete cementing material; 40-75 parts of concrete coarse aggregate; 2-6 parts of an exciting agent; 0.5-1 part of modifier; 0.07-0.1 part of water-retaining agent; 0.1-1 part of hydrophobizing agent; 0.3-0.5 part of anticracking agent; 20-26 parts of fine aggregate; 3-5 parts of solid phase binder; 10-15 parts of expanded perlite.

2. The calcination-free desulfurized gypsum dry-mixed mortar of claim 1, wherein: the water-retaining agent is one or more selected from methyl cellulose, hydroxypropyl methyl cellulose, cyanoethyl cellulose, benzyl cyanoethyl cellulose, carboxymethyl hydroxyethyl cellulose and phenyl cellulose or modified starch.

3. The calcination-free desulfurized gypsum dry-mixed mortar of claim 1, wherein: the concrete cementing material is an inorganic cementing material and comprises one of cement and fly ash.

4. The calcination-free desulfurized gypsum dry-mixed mortar of claim 1, wherein: the exciting agent is prepared from the following reagents in parts by weight at normal temperature: 80% of calcium oxide powder and 20% of sodium sulfate powder, and the modifier is prepared from the following reagents in parts by weight at normal temperature: 30% of water reducer, 50% of powder asphalt, 16% of polyvinyl alcohol and 4% of copper sulfate powder.

5. The calcination-free desulfurized gypsum dry-mixed mortar of claim 1, wherein: the content of calcium sulfate dihydrate in the calcination-free desulfurized gypsum is not less than 90%.

6. The calcination-free desulfurized gypsum dry-mixed mortar of claim 1, wherein: the water-retaining agent is one or more of methyl cellulose and cyanoethyl cellulose; the anticracking agent is one or several selected from steel fiber, asbestos fiber, glass fiber and PP fiber.

7. The method for preparing calcination-free desulfurized gypsum dry-mixed mortar according to claims 1-6, which is characterized by comprising the following steps: the method comprises the following steps:

s1, weighing raw materials, namely weighing concrete coarse aggregate, fine aggregate, calcination-free desulfurized gypsum, concrete cementing material, modifier, water-retaining agent, water repellent, anticracking agent and solid phase binder according to the component ratio in a quantitative manner for standby;

s2: raw material treatment, namely washing the concrete coarse aggregate, the concrete fine aggregate and the calcination-free desulfurized gypsum in the step S1 with water, and drying for later use;

s3: crushing, namely putting the dried concrete coarse aggregate, fine aggregate and calcination-free desulfurized gypsum in the step S2 into a crusher for crushing treatment, controlling the crushing granularity to be 10-20 mm, and standing by after the crushing is finished

S4: grinding the main material, namely pouring the crushed raw materials in the step S3 into a grinder for grinding, controlling the particle size to be 3-5 mm, and the rotating speed of a grinding disc to be 60-130 r/min, and screening out the raw materials of 3-5 mm under a vibration screen to obtain grinding raw materials for later use;

s5: grinding auxiliary materials, namely respectively putting the expanded perlite in the step S1 into a ball mill for grinding treatment, controlling the size of the ground particles to be 0.5mm-1mm, controlling the rotating speed of the ball mill to be 25-30 r/min, and reserving the obtained aggregate;

s6: crushing, namely pouring the exciting agent, the modifier, the water retention agent, the water repellent and the cracking resistance agent in the S1 into a crusher for crushing treatment for later use;

s7: mixing once, pouring the raw materials obtained in the step S4 into a mixer, pouring the concrete cementing material and the solid-phase binder into the mixer for mixing, controlling the mixing time to be 10-20min, and controlling the rotating speed of the mixer to be 120-200 rpm to obtain raw materials for later use;

s8, secondary mixing, namely pouring the mixed raw material obtained in the step S7 into a high-speed mixer, pouring the raw material in the step S5, the high polymer in the step S1 and the additive in the step S6 into the high-speed mixer, stirring and mixing, controlling the rotating speed of the mixer to be 300-500 r/min, and stirring and mixing time to be 10-20min, thus obtaining the dry-mixed mortar.

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