CN116177976A - Calcination-free desulfurized 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 desulfurized gypsum dry-mixed mortar and preparation method thereof

Technical Field

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

Background

The plastering dry-mixed mortar for the wall bodies (inner wall and outer wall) is an important component in the construction engineering.

In the prior art, the wall plastering dry-mixed mortar is mainly prepared by the following method: firstly, directly producing by using natural semi-hydrated gypsum; and calcining the desulfurization product dihydrate gypsum into semi-hydrated gypsum, grinding, and then adding retarder, water retention additives and aggregates such as quartz sand. On the one hand, natural semi-hydrated gypsum is used as a natural resource, and the storage amount of the natural semi-hydrated gypsum is smaller and smaller; on the other hand, the industrial desulfurization byproduct dihydrate desulfurized gypsum is utilized to calcine into semi-hydrated gypsum, which causes environmental pollution, and has the defects of huge supporting facilities, large investment and the like. The production cost of the wall plastering dry-mixed mortar is high for the reasons.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the calcination-free desulfurized gypsum dry-mixed mortar and the preparation method thereof.

In order to solve the technical problems, the invention provides the following technical scheme: the calcination-free desulfurized gypsum dry-mixed mortar 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.

As a preferable technical scheme of the invention, the water-retaining agent is selected from one or more of methyl cellulose, hydroxypropyl methyl cellulose, cyanoethyl cellulose, benzyl cyanoethyl cellulose, carboxymethyl hydroxyethyl cellulose and phenyl cellulose or modified starch.

As a preferable technical scheme of the invention, the concrete cementing material is an inorganic cementing material and comprises one of cement and fly ash.

As a preferable technical scheme of the invention, 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.

As a preferable technical scheme of the invention, the content of calcium sulfate dihydrate in the calcination-free desulfurized gypsum is not less than 90%.

As a preferable technical scheme of the invention, the water-retaining agent is selected from 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.

A preparation method of calcination-free desulfurized gypsum dry-mixed mortar 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.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the environment-friendly preparation method of the dry-mixed mortar, provided by the invention, the calcination-free desulfurized gypsum and the concrete cementing material are adopted as main materials, and the solid-phase binder high polymer is added, so that the performance of a final product is improved, the effects of heat preservation, heat insulation, ageing resistance and high and low temperature resistance of the mortar are enhanced, the quality of the product is ensured, and the dry-mixed mortar is suitable for wide popularization.

2. The invention adopts the mixture of polyvinyl alcohol, copper sulfate powder, powder asphalt and naphthalene water reducer as the modifier, the polyvinyl alcohol has the functions of regulating coagulation and retaining water, the powder asphalt can improve the waterproof performance of the material, the naphthalene water reducer can reduce the water consumption, and the compression resistance and the breaking strength are improved.

Drawings

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

Detailed Description

In order that the manner in which the above recited features, objects and advantages of the present invention are obtained will become readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Based on the examples in the embodiments, those skilled in the art can obtain other examples without making any inventive effort, which fall within the scope of the invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents, etc. used in the following examples are commercially available unless otherwise specified.

Embodiment one:

as shown in FIG. 1, the invention provides 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.

In other embodiments, the water retaining agent is selected from one or more of methylcellulose, hydroxypropyl methylcellulose, cyanoethylcellulose, benzyl cyanoethylcellulose, carboxymethyl hydroxyethyl cellulose, and phenylcellulose or modified starch.

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

In other embodiments, the activator is prepared from the following reagents in weight ratio 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.

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

In other embodiments, the water-retaining agent is selected from one or more of methylcellulose and cyanoethylcellulose; the anticracking agent is one or several selected from steel fiber, asbestos fiber, glass fiber and PP fiber.

A preparation method of calcination-free desulfurized gypsum dry-mixed mortar 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.

Embodiment two:

the embodiment provides 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; 0.1-1 part of hydrophobizing agent; 0.3-0.5 part of anticracking agent; 20-26 parts of fine aggregate; 10-15 parts of expanded perlite.

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

In other embodiments, the activator is prepared from the following reagents in weight ratio 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.

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

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

The embodiment also provides a preparation method of calcination-free desulfurized gypsum dry-mixed mortar, which comprises the following steps:

s1, weighing raw materials, namely weighing concrete coarse aggregate, fine aggregate, calcination-free desulfurized gypsum, concrete cementing material, modifier, hydrophobing agent and anticracking agent quantitatively according to the component ratio for later use;

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 reserving 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 hydrophobing agent and the anticracking agent in the step 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 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 r/min 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.

In this example, compared with the first example, the water-retaining agent and the solid-phase binder were not added, and in contrast to the first example, the mortar had poorer water absorption performance and poorer water storage effect after the same procedure as the first example.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

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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