CN111205058A - Self-leveling mortar and preparation method and application thereof - Google Patents
Self-leveling mortar and preparation method and application thereof Download PDFInfo
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- CN111205058A CN111205058A CN202010121105.8A CN202010121105A CN111205058A CN 111205058 A CN111205058 A CN 111205058A CN 202010121105 A CN202010121105 A CN 202010121105A CN 111205058 A CN111205058 A CN 111205058A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/60—Flooring materials
- C04B2111/62—Self-levelling compositions
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of building materials, in particular to self-leveling mortar and a preparation method and application thereof; the self-leveling mortar comprises the following raw materials: the self-leveling mortar comprises a cementing material, solid wastes and functional components, wherein the cementing material accounts for 20-40% of the self-leveling mortar; wherein the cementing material comprises sulphoaluminate cement, Portland cement and gypsum; the mass ratio of the sulphoaluminate cement to the Portland cement to the gypsum is 4-6: 2-4: 1 to 3. The self-leveling mortar has high stability; meanwhile, a large amount of solid waste is doped into the self-leveling mortar provided by the invention, so that the high stability of the self-leveling mortar is not influenced, the cost of the self-leveling mortar is greatly reduced, and the self-leveling mortar is environment-friendly.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to self-leveling mortar and a preparation method and application thereof.
Background
In recent years, cement-based self-leveling mortar has been commonly used for concrete floors of office buildings, apartments, shopping malls, schools, hospitals, factories, parking lots, ships and the like because of its advantages of high fluidity, self-leveling property, rapid construction, low labor intensity and the like. The cement-based self-leveling mortar is the third place to be arranged in the market application of the ten largest potential dry-mixed mortars and the admixtures thereof in the future. The performance of the cement-based self-leveling mortar should meet the requirements of high working performance, rapid drying, rapid hardening, shrinkage compensation, high flatness and the like, so that the self-leveling mortar becomes a product with high technical content and relatively complex technical links, and is called as the most complex product by engineering people. Generally, cement-based self-leveling mortars are based on a ternary composite system capable of forming ettringite because of the requirements of rapid hardening, high water binding capacity and low shrinkage, while ettringite formation has the properties of rapid formation speed, high water binding capacity and shrinkage compensation. However, the stability of the self-leveling mortar of the ternary composite system is difficult to control, and the problems of cracking, hollowing and the like are easy to occur in the practical application process.
The utilization of industrial solid wastes is mainly concentrated in the building material industry, and the annual consumption of a large amount of industrial solid wastes accounts for about 70 parts of the total utilization amount of the industrial solid wastes. Along with the development of infrastructure, natural resources such as river sand and the like are more and more in shortage, so that the price of the natural resources is higher and higher, and the utilization of industrial solid wastes in building materials has economic benefits and can generate larger environmental benefits and social benefits.
In the prior art, the performance (especially the stability) of the self-leveling mortar is difficult to reach the use standard; furthermore, the self-leveling mortar is prepared from natural high-quality materials, so that the cost is high. How to obtain the self-leveling mortar which has excellent performance (especially stability), lower cost and environmental protection is a difficult problem which needs to be solved urgently by the personnel in the field.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
In order to solve the technical problems, the invention provides self-leveling mortar (a ternary gelling system); the self-leveling mortar has high stability; meanwhile, a large amount of solid waste is doped into the self-leveling mortar provided by the invention, so that the high stability of the self-leveling mortar is not influenced, the cost of the self-leveling mortar is greatly reduced, and the self-leveling mortar is environment-friendly.
Specifically, the self-leveling mortar comprises the following raw materials: the self-leveling mortar comprises a cementing material, solid wastes and functional components, wherein the cementing material accounts for 20-40% of the self-leveling mortar;
wherein the cementing material comprises sulphoaluminate cement, Portland cement and gypsum; the mass ratio of the sulphoaluminate cement to the Portland cement to the gypsum is 4-6: 2-4: 1 to 3.
According to the invention, the self-leveling mortar with excellent stability is obtained by forming a ternary gelling system by sulphoaluminate cement, portland cement and gypsum. In addition, solid waste is used as a building material mainly according to the morphological effect, the micro-aggregate effect, the pozzolanic effect, and the chemical and mineral composition of industrial solid waste; the micro-aggregate effect and the volcanic ash effect have the most obvious effect, the micro-aggregate effect is used as an aggregate or a filler, the volcanic effect is used as an auxiliary cementing material, and the micro-aggregate effect and the volcanic ash effect are matched with each other to improve the durability of the building material.
Preferably, the self-leveling mortar comprises the following raw materials in parts by weight: 20-40 parts of a cementing material, 58-75 parts of solid waste and 1-5 parts of a functional component.
Preferably, the solid waste comprises aggregate and powder; the mass ratio of the aggregate to the powder is 4-6: 1-3;
preferably, the functional components comprise a water reducing agent, a retarder, a water-retaining agent, a tackifier and a defoaming agent; the mass ratio of the water reducing agent to the retarder, the water-retaining agent, the tackifier and the defoaming agent is 13-25: 4-8: 8-14: 80-150: 1 to 4.
Preferably, the 3d compressive strength of the sulphoaluminate cement is more than or equal to 42.5 MPa; preferably, the sulphoaluminate cement is fast hardening sulphoaluminate cement or sulphoaluminate cement clinker (especially ideal).
Preferably, the portland cement is type I portland cement or type II portland cement; preferably a type I portland cement.
Preferably, the gypsum is natural hemihydrate gypsum or desulfurized hemihydrate gypsum; preferably natural hemihydrate gypsum.
Preferably, the aggregate has a particle size of less than 0.5 mm; preferably, the aggregate is tailings sand and/or waste rock machine-made sand; as a better technical scheme, the grading of the aggregate is continuous grading or sectional grading (particularly ideal); as the best technical scheme, the aggregate is tailing sand with sectional grading.
Preferably, the powder is selected from one or more of fly ash, steel slag, limestone powder and granulated blast furnace slag; preferably fly ash and limestone powder; as a better technical scheme, the specific surface area of the powder is more than or equal to 400m2/kg。
Preferably, the water reducing agent is one or more selected from an ether polycarboxylic acid water reducing agent and an ester polycarboxylic acid water reducing agent.
Preferably, the retarder is one or more selected from tartaric acid, citric acid and sodium gluconate.
Preferably, the water-retaining agent is selected from one or more of methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl methyl cellulose.
Preferably, the reinforcing agent is selected from one or more of copolymer rubber powder of vinyl acetate and ethylene, ternary copolymer rubber powder of ethylene, vinyl chloride and vinyl laurate, and ternary copolymer rubber powder of vinyl acetate, ethylene and higher fatty acid vinyl ester.
Preferably, the defoaming agent is selected from one or more of polyether defoaming agent, higher alcohol fatty acid ester compound and polyether modified silicon.
Preferably, the water reducing agent, the retarder, the water-retaining agent, the tackifier and the defoaming agent are all powder
As a better technical scheme of the invention, the self-leveling mortar comprises the following raw materials in parts by weight:
25-40 parts of cementing material
58-74 parts of solid waste
1-2 parts of a functional component;
wherein the gel material comprises the following components in parts by weight:
12-20 parts of sulphoaluminate cement
7-12 parts of Portland cement
5-8 parts of natural semi-hydrated gypsum;
the solid waste comprises the following components in parts by weight:
40-52 parts of tailing sand
12-16 parts of fly ash
5-7 parts of limestone powder;
the functional components comprise the following components in parts by weight:
the invention also provides a preparation method of the self-leveling mortar, which comprises the steps of sequentially adding the solid waste, the cementing material and the functional component, and uniformly mixing.
The invention also provides application of the self-leveling mortar in building materials.
Preferably, when the self-leveling mortar is used, water is added into the self-leveling mortar and uniformly mixed; the water accounts for 15-25% of the total mass of the self-leveling mortar; further, the water accounts for 20-23% of the total mass of the self-leveling mortar.
The self-leveling mortar provided by the invention can utilize solid waste on the premise of high stability of a ternary gelling system, wherein the ternary gelling system is composed of sulphoaluminate cement, silicate cement and gypsum; the main reaction product of the sulphoaluminate cement, the silicate cement and the gypsum is ettringite which has the advantages of high forming speed, high water binding capacity and shrinkage compensation performance. However, different generation time of ettringite produces different effects on the material performance of the ternary gelling system, the ettringite formed in the plastic stage only has the filling and skeleton effects, the expansion and the compensation shrinkage can be formed only in the elastic-plastic stage, and the ettringite formed in the hardening stage, namely the delayed ettringite, can cause the cracking of the cement-based material; meanwhile, the ettringite of the ternary gelation system with different proportions has different generation quantity, crystallinity, size, micro morphology and the like, and the stability of the ettringite is influenced. According to the invention, the proportion of the sulphoaluminate cement, the Portland cement and the gypsum in the ternary gelling system is determined through a large number of experimental researches and tests, and a stable area is found out, so that the self-leveling mortar with high stability is obtained.
The self-leveling mortar comprises solid wastes (including aggregates and powder); the aggregate mainly plays a role in supporting the framework, and the reasonable grading combination can improve the workability, mechanical property and durability of the self-leveling mortar; the powder material mainly improves the working performance, the later strength and the durability of the self-leveling mortar. The self-leveling mortar also comprises functional components, and the overall performance of the self-leveling mortar is improved mainly by the superposition of functions such as water reduction, retarding, water retention, tackifying, defoaming and the like.
Therefore, the self-leveling mortar obtained by screening and combining has the advantages that the cost is further reduced on the basis of improving the stability through the synergistic interaction among the components, and the self-leveling mortar is green and environment-friendly; experiments prove that the self-leveling mortar provided by the invention has excellent performance, completely meets the performance requirements of JC/T985-containing 2017 cement-based self-leveling mortar for the ground, and is specifically shown in Table 1;
TABLE 1 self-leveling mortar Properties
The invention has the beneficial effects that:
(1) according to the invention, the ettringite with high crystallinity and large size can be generated through the use ratio of the sulphoaluminate cement, the silicate cement and the gypsum, so that the high stability of the ternary gelling system self-leveling mortar is ensured.
(2) Based on the high stability of the ternary gelling system self-leveling mortar, the mixing proportion of the solid waste can be improved, namely the comprehensive utilization rate of the solid waste is improved, and the cost of the self-leveling mortar is greatly reduced.
(3) The self-leveling mortar disclosed by the invention comprehensively utilizes solid wastes on one hand, and saves labor force, cost and excellent comfort on the other hand.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The quick-hardening sulphoaluminate cement involved in the embodiment is purchased from North polar bear of Tangshan Co., Ltd, and has the 3d compressive strength of 52.9MPa, the 3d flexural strength of 8.6MPa, the 28d compressive strength of 57.0MPa and the 28d flexural strength of 8.7 MPa.
The portland cement provided in the examples is provided by beijing corner water environmental protection technology ltd, and has a 3d compressive strength of 25.3MPa, a 3d flexural strength of 4.8MPa, a 28d compressive strength of 52.8MPa, and a 28d flexural strength of 8.6 MPa.
The natural hemihydrate gypsum referred to in the examples is provided by Beijing golden corner mortar GmbH, and has a 2h compressive strength of 20.8MPa and a flexural strength of 6.5 MPa.
The iron tailing sand related in the embodiment is provided by Chengdi of Beijing golden corner mortar Limited, and the radioactivity specific activities of natural radionuclides radium-226, thorium-232 and potassium-40 in the tailing fine sand meet the conditions that IRa is less than or equal to 1.0 and Ir is less than or equal to 1.0 at the same time; the tailing sand consists of two grades with the grain diameter not less than 0 and less than 0.25mm and not more than 0.25mm and less than 0.50mm, and the two grades are combined according to the ratio of 4: 6.
The fly ash involved in the examples is provided by Beijing Jinqi concrete Co.Ltd, and the fly ash is I-grade fly ash with the specific surface area of 450m2Per kg; limestone powder with specific surface area of 420m is provided by Jidong sandstone aggregate Co Ltd2/kg。
The water reducing agent related in the embodiment is purchased from chemical building materials ltd of Xingbang, Suzhou; the retarder is purchased from Guang fine chemical company of Beijing; the water-retaining agent is purchased from Shandong Suno chemical company, Ltd; tackifiers were purchased from wacker chemical (china) limited; defoamers were purchased from Xingbang chemical building materials, Inc., Suzhou.
The water reducing agent, the retarder, the water-retaining agent, the tackifier and the defoaming agent are all powder.
The performance detection methods of the following examples and comparative examples were performed according to the test method JC/T985-2017 Cement-based self-leveling mortar for the ground.
Examples 1 to 3
Examples 1 to 3 provide self-leveling mortars whose raw material compositions are shown in table 2;
table 2 raw material composition of self-leveling mortar of examples 1 to 3
The preparation method of the self-leveling mortar comprises the following steps: adding the solid waste, the cementing material and the functional components in sequence, mixing while adding, and finally fully and uniformly mixing.
The self-leveling mortar has the following performance tests: and (3) stirring the self-leveling mortar and water (based on the total mass of the self-leveling mortar) for 3-5 min, standing for 1min, and testing the performances of the self-leveling mortar, wherein the performances are shown in table 3.
TABLE 3 Properties of self-leveling mortars of examples 1 to 3
Comparative examples 1 to 3
Comparative examples 1 to 3 provide self-leveling mortar, which is different from examples 1 to 3 in that: the mass ratio of the quick hardening sulphoaluminate cement to the Portland cement to the natural semi-hydrated gypsum is different; the raw material composition is shown in table 4;
table 4 raw material composition of self-leveling mortar of comparative examples 1 to 3
The preparation method and the performance test method of the self-leveling mortar are the same as those of the embodiments 1-3; the properties are shown in Table 5;
TABLE 5 Properties of self-leveling mortars of comparative examples 1 to 3
Comparative example 4
This comparative example provides a self-leveling mortar, which differs from example 1 in that: replacing quick-hardening sulphoaluminate cement, portland cement and natural semi-hydrated gypsum with ordinary portland cement, and replacing tailing sand with natural sand; the raw material composition is shown in table 6;
table 6 raw material composition of self-leveling mortar of comparative example 4
The preparation method and the performance test method of the self-leveling mortar are the same as those of the embodiment 1; the properties are shown in Table 7;
table 7 properties of the self-leveling mortars of comparative example 4
Although the invention has been described in detail hereinabove by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that many modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The self-leveling mortar is characterized by comprising the following raw materials: the self-leveling mortar comprises a cementing material, solid wastes and functional components, wherein the cementing material accounts for 20-40% of the self-leveling mortar;
wherein the cementing material comprises sulphoaluminate cement, Portland cement and gypsum; the mass ratio of the sulphoaluminate cement to the Portland cement to the gypsum is 4-6: 2-4: 1 to 3.
2. The self-leveling mortar of claim 1, comprising the following raw materials in parts by weight: 20-40 parts of a cementing material, 58-75 parts of solid waste and 1-5 parts of a functional component.
3. Self-leveling mortar according to claim 1 or 2, wherein the solid waste comprises aggregates and fines; the mass ratio of the aggregate to the powder is 4-6: 1-3;
and/or the functional components comprise a water reducing agent, a retarder, a water-retaining agent, a tackifier and a defoaming agent; the mass ratio of the water reducing agent to the retarder, the water-retaining agent, the tackifier and the defoaming agent is 13-25: 4-8: 8-14: 80-150: 1 to 4.
4. The self-leveling mortar of claim 3, wherein the 3d compressive strength of the sulphoaluminate cement is not less than 42.5 MPa; preferably, the sulphoaluminate cement is quick-hardening sulphoaluminate cement or sulphoaluminate cement clinker;
and/or the portland cement is type I portland cement or type II portland cement; preferably type I portland cement;
and/or the gypsum is natural hemihydrate gypsum or desulfurized hemihydrate gypsum; preferably natural hemihydrate gypsum.
5. A self-levelling screed according to claim 3 in which the aggregate has a particle size of less than 0.5 mm; preferably, the aggregate is tailings sand and/or waste rock machine-made sand;
and/or the powder is selected from one or more of fly ash, steel slag, limestone powder and granulated blast furnace slag; fly ash and limestone powder are preferred.
6. The self-leveling mortar of claim 3, wherein the water reducer is selected from one or more of an ether polycarboxylic acid water reducer, an ester polycarboxylic acid water reducer;
and/or the retarder is selected from one or more of tartaric acid, citric acid and sodium gluconate;
and/or the water-retaining agent is selected from one or more of methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl methyl cellulose;
and/or the reinforcing agent is selected from one or more of copolymer rubber powder of vinyl acetate and ethylene, ternary copolymer rubber powder of ethylene, vinyl chloride and vinyl laurate, and ternary copolymer rubber powder of vinyl acetate, ethylene and higher fatty acid vinyl ester;
and/or the defoaming agent is selected from one or more of polyether defoaming agent, higher alcohol fatty acid ester compound and polyether modified silicon.
7. The self-leveling mortar of claim 1, comprising the following raw materials in parts by weight:
25-40 parts of cementing material
58-74 parts of solid waste
1-2 parts of a functional component;
wherein the gel material comprises the following components in parts by weight:
12-20 parts of sulphoaluminate cement
7-12 parts of Portland cement
5-8 parts of natural semi-hydrated gypsum;
the solid waste comprises the following components in parts by weight:
40-52 parts of tailing sand
12-16 parts of fly ash
5-7 parts of limestone powder;
the functional components comprise the following components in parts by weight:
8. the preparation method of the self-leveling mortar of any one of claims 1 to 7, characterized by sequentially adding the solid waste, the cementing material and the functional component and uniformly mixing.
9. Use of the self-leveling mortar of any one of claims 1 to 7 in a building material.
10. The use according to claim 9, wherein water is added to the self-leveling mortar and mixed homogeneously; the water accounts for 15-25% of the total mass of the self-leveling mortar; preferably, the water accounts for 20-23% of the total mass of the self-leveling mortar.
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| CN112408932A (en) * | 2020-11-12 | 2021-02-26 | 涉县清漳水泥制造有限公司 | Manufacturing method of solid waste base cementing material mortar and raw material quantitative screening device |
| CN112624719A (en) * | 2020-12-23 | 2021-04-09 | 宁波汉华建材科技有限公司 | Preparation method of functional self-leveling mortar with heat preservation performance |
| CN112851281A (en) * | 2021-01-27 | 2021-05-28 | 佛山优尼凯新材料有限公司 | Method for preparing polymer quick-drying early-strength anti-corrosion mortar |
| CN114195471A (en) * | 2021-12-13 | 2022-03-18 | 深圳市华威环保建材有限公司 | Regenerated self-leveling mortar and preparation method and application thereof |
| CN114436612A (en) * | 2022-01-26 | 2022-05-06 | 东方雨虹砂粉科技集团有限公司 | Gypsum-based self-leveling mortar composition |
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| CN114436612A (en) * | 2022-01-26 | 2022-05-06 | 东方雨虹砂粉科技集团有限公司 | Gypsum-based self-leveling mortar composition |
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Effective date of registration: 20220927 Address after: 100041 No. 69 Jinding North Road, Beijing, Shijingshan District Patentee after: BEIJING BUILDING MATERIALS ACADEMY OF SCIENCES RESEARCH Patentee after: TIANJIN JINYU BAOHUI MORTAR CO.,LTD. Address before: 100041 No. 69 Jinding North Road, Beijing, Shijingshan District Patentee before: BEIJING BUILDING MATERIALS ACADEMY OF SCIENCES RESEARCH |