CN117865631A - Self-leveling mortar of desulfurized gypsum fly ash - Google Patents
Self-leveling mortar of desulfurized gypsum fly ash Download PDFInfo
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 98
- 239000010440 gypsum Substances 0.000 title claims abstract description 98
- 239000010881 fly ash Substances 0.000 title claims abstract description 71
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 68
- 239000000463 material Substances 0.000 claims abstract description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000002156 mixing Methods 0.000 claims abstract description 34
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 239000000654 additive Substances 0.000 claims abstract description 21
- 230000000996 additive effect Effects 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims description 112
- 239000003638 chemical reducing agent Substances 0.000 claims description 26
- 239000004576 sand Substances 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 238000012669 compression test Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 238000001179 sorption measurement Methods 0.000 claims description 9
- 230000000740 bleeding effect Effects 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000009662 stress testing Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000003469 silicate cement Substances 0.000 claims description 4
- 239000000701 coagulant Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 claims description 2
- 238000007711 solidification Methods 0.000 abstract description 6
- 230000008023 solidification Effects 0.000 abstract description 6
- 239000004568 cement Substances 0.000 abstract description 5
- 239000004566 building material Substances 0.000 abstract description 4
- 239000002585 base Substances 0.000 description 10
- 239000000843 powder Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 229910052925 anhydrite Inorganic materials 0.000 description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910001570 bauxite Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000012615 aggregate Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses self-leveling mortar of desulfurized gypsum fly ash in the field of building materials, which is prepared by mixing and stirring cementing materials, fine aggregate, desulfurized gypsum, fly ash, additives and water, wherein the addition amount of the fine aggregate is 56-58% of the total mass of the cementing materials based on the total mass of the cementing materials, the addition amount of the desulfurized gypsum is 10-50% of the total mass of the cementing materials, the addition amount of the fly ash is 10-50% of the total mass of the cementing materials, the addition amount of the additives is 0.4-0.8% of the total mass of base materials, and the addition amount of the water is 34-36% of the total mass of the base materials. According to the scheme, cement is used as a main material, the desulfurized gypsum, the fly ash and the additive are added to prepare the desulfurized gypsum fly ash self-leveling mortar, and the adhesiveness and the viscosity of the self-leveling mortar are improved by designing the proportion of the desulfurized gypsum, the fly ash and the additive, so that the material is easier to use and construct, and the crack resistance and the moisture resistance of the self-leveling mortar after solidification are improved.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to self-leveling mortar of desulfurized gypsum fly ash.
Background
In the last 50 years, after the third industrial revolution, some new building materials have come out gradually and are widely used. In 1953, a wall and ground production supplier, german madex (Ardex), developed a self-leveling material, which is a new starting point for floor materials, and entered the self-leveling material market in China with the development of the construction industry in China.
The self-leveling mortar is prepared by mixing materials such as cementing materials, aggregates, mineral admixture, additives and the like. It has the advantages of excellent fluidity, stability, flatness, high efficiency, etc. The poured ground can be used for paving floor tiles and wood floors, and can be used for floors of apartments, shops, production workshops and the like. In addition, the method can be also used for the ground with high flatness in decoration engineering.
Gypsum self-leveling mortars commonly used in the market generally use the addition of anhydrite to improve the adhesion and tack of the mortar mixture, thereby making the material easier to use and construct. Although the anhydrite storage of China is high, the high-quality anhydrite which can be used for improving the mortar performance has small proportion, the utilization rate of the desulfurized gypsum generated by thermal power generation in China is gradually increased year by year, and the existing research shows that the hydration kinetics, the coagulation characteristics and the process of the desulfurized gypsum are the same as those of the natural gypsum, but the speed is high; the physical and chemical properties of the desulfurized gypsum are basically consistent with those of natural gypsum, and the dihydrate gypsum (CaSO 4 ·2H 2 The grade of O) can reach 90% -93%, the free water content is 10% -12%, the alkali content is low, the radioactivity is free, the harmful impurities are few, and the product can replace natural gypsum to be used as a raw material in building material industry.
The patent with publication number CN115028426A discloses a gypsum-based self-leveling mortar proportioning method, which comprises the following components in parts by weight: 50-200 parts of Portland cement, 200-350 parts of desulfurized gypsum powder, 30-100 parts of perlite, 50-100 parts of sand and 150-250 parts of bauxite powder.
The patent directly mixes the desulfurized gypsum powder into mortar, and the desulfurized gypsum powder and the bauxite powder can form a cementing system together with silicate cement so as to increase the adhesiveness and the viscosity of the mortar mixture, thereby enabling the material to be easier to use and construct. However, the dosage of the desulfurized gypsum in the prior art is often several times to more than ten times of the dosage of cement, and although the desulfurized gypsum is taken as a main material, the cost can be reduced, the curing time of mortar is slowed down, but the strength, the plasticity, the water resistance and other performances of the cured desulfurized gypsum are reduced, and the desulfurized gypsum fly ash is easy to erode in a humid environment, so that the self-leveling mortar is provided.
Disclosure of Invention
The invention aims to provide self-leveling mortar of desulfurized gypsum fly ash, which solves the problems that the strength, plasticity, waterproofness and other performances of the existing gypsum self-leveling mortar are reduced after solidification, and the existing gypsum self-leveling mortar is easy to erode in a humid environment.
In order to achieve the above object, the technical scheme of the present invention is as follows: the self-leveling mortar is prepared by mixing and stirring a cementing material, fine aggregate, desulfurized gypsum, fly ash, an additive and water, wherein the addition amount of the fine aggregate is 56-58% of the total mass of the cementing material, the addition amount of the desulfurized gypsum is 10-50% of the total mass of the cementing material, the addition amount of the fly ash is 10-50% of the total mass of the cementing material, the addition amount of the additive is 0.4-0.8% of the total mass of a base material, and the addition amount of the water is 34-36% of the total mass of the base material based on the total mass of the cementing material.
Further, the self-leveling mortar is prepared by mixing and stirring a cementing material, fine aggregate, desulfurized gypsum, fly ash, an additive and water, wherein the addition amount of the fine aggregate is 57% of the total mass of the cementing material, the addition amount of the desulfurized gypsum is 20% -30% of the total mass of the cementing material, the addition amount of the fly ash is 30% -40% of the total mass of the cementing material, the addition amount of the additive is 0.6% of the total mass of the base material, and the addition amount of the water is 35% of the total mass of the base material based on the total mass of the cementing material.
Further, the cementing material adopts P.O42.5 ordinary Portland cement, the fine aggregate adopts natural sand, the additive comprises a water reducing agent and a retarder, the water reducing agent adopts a polycarboxylic acid high-performance water reducing agent, the retarder adopts a gypsum retarder, and the mass part ratio of the water reducing agent to the retarder is 1:1.
Further, the preparation method of the self-leveling mortar of the desulfurized gypsum fly ash comprises the following steps:
s1, filtering natural sand through a 2.36mm sieve, washing with water, and drying in an oven for later use;
s2, respectively filtering the desulfurized gypsum and the fly ash through a 0.075mm sieve for standby;
s3, mixing the natural sand treated by the S1 and the S2, the desulfurized gypsum and the silicate cement according to a proportion, and adding the fly ash to mix and stir uniformly to obtain a mixture;
s4, adding water into the mixture in proportion under the stirring speed of 80-100r/min, stirring and mixing, and sequentially adding the polycarboxylic acid high-performance water reducer and the gypsum coagulant under the stirring speed of 50-80r/min, stirring and mixing to obtain the self-leveling mortar of the desulfurized gypsum fly ash;
s5, pouring the self-leveling mortar of the desulfurized gypsum fly ash prepared in the S4 into the ground for self-leveling.
Further, the method for optimizing the proportion of the self-leveling mortar of the desulfurized gypsum fly ash comprises the following steps:
step one, determining components and proportions of a comparison sample to be optimized;
step two, preparing a comparison sample to be optimized according to different components and proportions, mixing and stirring, testing the fluidity and bleeding condition under a gypsum-based self-leveling tester, and recording the test results of the fluidity and bleeding condition;
step three, manufacturing test pieces according to different components and proportions, wherein 3 test pieces with the same components and proportions are arranged in each group, the 3 test pieces with the same components and proportions comprise a first cuboid test piece, a second cuboid test piece and a cube test piece, the test pieces are dried at room temperature for 24 hours and then demolded, and then the test pieces are transferred into a constant temperature and humidity curing box for curing, wherein the first cuboid test piece in each group is cured for 7 days, the second cuboid test piece is cured for 14 days, and the cube test piece is taken out for drying at room temperature for 2 days after being cured for 12 days;
step four, taking out the first cuboid test piece after curing for 7 days in a constant temperature and humidity curing box, placing the first cuboid test piece in a full-braking fracture-resistant compression-resistant constant stress testing machine for fracture-resistant compression test, and recording the fracture-resistant compression test result of the first cuboid test piece;
step five, taking out the second cuboid test piece after curing in a constant temperature and humidity curing box for 14 days, placing the second cuboid test piece in a full-braking fracture-resistant compression-resistant constant stress testing machine for fracture-resistant compression test, and recording the fracture-resistant compression test result of the second cuboid test piece;
step six, curing the cube test pieces in a constant temperature and humidity curing box for 12 days, airing the cube test pieces at room temperature for 2 days, drying the cube test pieces in an oven, recording the initial weight of the cube test pieces, placing the cube test pieces in a curing barrel for water absorption, adsorption coefficient and softening coefficient tests, and respectively recording the tested weight of the cube test pieces to obtain test results of the water absorption, adsorption coefficient and softening coefficient of each group of cube test pieces;
and step seven, comparing the test results of the step two and the step four to the step six, and obtaining the optimal components and the proportion of the self-leveling mortar of the desulfurized gypsum fly ash according to the test results.
In the third step, the room temperature condition is 20+/-5 ℃, the maintenance condition of the constant temperature and humidity maintenance box is 20+/-2 ℃, and the relative humidity is 88% -92%.
Further, when the first cuboid test piece and the second cuboid test piece are subjected to the bending and compression test in the fourth step, the bending and compression rate is 1.2KN/s, and the compression rate is 50N/s.
And in the step six, the temperature of the square test piece is 70+/-5 ℃ when the square test piece is dried.
After the scheme is adopted, the following beneficial effects are realized:
according to the scheme, cement is used as a main material, the desulfurized gypsum, the fly ash and the admixture are added to prepare the desulfurized gypsum and fly ash self-leveling mortar, and the adhesiveness and the viscosity of the self-leveling mortar are improved by designing the proportion of the desulfurized gypsum, the fly ash and the admixture on the premise of ensuring the performances of strength, plasticity, waterproofness and the like after solidification, so that the self-leveling mortar is easier to use and construct, the cracking resistance and the moisture resistance of the self-leveling mortar after solidification are improved, the problems that the strength, the plasticity, the waterproofness and the like of the existing gypsum self-leveling mortar after solidification are reduced, and the like are easily corroded in a humid environment are solved, and the utilization rate of the desulfurized gypsum and the fly ash is also improved.
The preparation method provided by the scheme has the following advantages that the natural sand is dried: the water can reduce the strength and durability of the cured mortar, and the cement dosage is increased to ensure the strength and fluidity due to high humidity of the natural sand, so that the water content in the concrete is reduced by drying the natural sand, the cement dosage is reduced, and the mortar cured compactness, freezing resistance and permeation resistance are improved.
The natural sand is filtered by a 2.36mm sieve, and the desulfurized gypsum and the fly ash are filtered by a 0.075mm sieve, so that the prepared mortar has small particle size of the inclusion, can be more uniform when being expanded, has small porosity after solidification and high compactness, and can improve the seepage-proofing performance of the solidified mortar, thereby improving the durability.
According to the scheme, the optimal components and the proportion are obtained through the proportion optimization method, so that the performance of the cured mortar and the cost for preparing the mortar can be considered.
Drawings
FIG. 1 is a graph showing the adsorption coefficients of desulfurized gypsum, fly ash, water reducer and retarder at various levels in example 5 of the present invention.
FIG. 2 is a graph showing the water absorption under the conditions of the desulfurized gypsum, the fly ash, the water reducing agent and the retarder with different contents in example 5 of the present invention.
FIG. 3 is a graph showing softening coefficients of desulfurized gypsum, fly ash, water reducer and retarder at various levels in example 5 of the present invention.
Detailed Description
The following is a further detailed description of the embodiments:
example 1:
the self-leveling mortar is prepared by mixing and stirring a cementing material, fine aggregate, desulfurized gypsum, fly ash, an additive and water, wherein the addition amount of the fine aggregate is 56-58% of the total mass of the cementing material, the addition amount of the desulfurized gypsum is 10-50% of the total mass of the cementing material, the addition amount of the fly ash is 10-50% of the total mass of the cementing material, the addition amount of the additive is 0.4-0.8% of the total mass of a base material, and the addition amount of the water is 34-36% of the total mass of the base material based on the total mass of the cementing material.
Example 2:
the difference from the above embodiment is that the self-leveling mortar is prepared by mixing and stirring a cementing material, fine aggregate, desulfurized gypsum, fly ash, an additive and water, wherein the addition amount of the fine aggregate is 57% of the total mass of the cementing material based on the total mass of the cementing material, the addition amount of the desulfurized gypsum is 20% -30% of the total mass of the cementing material, the addition amount of the fly ash is 30% -40% of the total mass of the cementing material, the addition amount of the additive is 0.6% of the total mass of the base material, and the addition amount of the water is 35% of the total mass of the base material.
Example 3:
the difference from the above embodiment is that the cementing material adopts P.O42.5 ordinary Portland cement, the fine aggregate adopts natural sand, the additive comprises a water reducing agent and a retarder, the water reducing agent adopts a polycarboxylic acid high-performance water reducing agent, the retarder adopts a gypsum retarder, and the mass ratio of the water reducing agent to the retarder is 1:1.
Example 4:
the method for preparing the self-leveling mortar by using the desulfurized gypsum fly ash is different from the embodiment, and comprises the following steps:
s1, filtering natural sand through a 2.36mm sieve, washing with water, and drying in an oven for later use;
s2, respectively filtering the desulfurized gypsum and the fly ash through a 0.075mm sieve for standby;
s3, mixing the natural sand treated by the S1 and the S2, the desulfurized gypsum and the silicate cement according to a proportion, and adding the fly ash to mix and stir uniformly to obtain a mixture;
s4, adding water into the mixture in proportion under the stirring speed of 80-100r/min, stirring and mixing, and sequentially adding the polycarboxylic acid high-performance water reducer and the gypsum coagulant under the stirring speed of 50-80r/min, stirring and mixing to obtain the self-leveling mortar of the desulfurized gypsum fly ash;
s5, pouring the self-leveling mortar of the desulfurized gypsum fly ash prepared in the S4 into the ground for self-leveling.
Example 5:
the method for optimizing the proportion of the self-leveling mortar of the desulfurized gypsum fly ash is different from the embodiment, and comprises the following steps:
determining components and proportions of a contrast sample to be optimized, wherein the components of the contrast sample to be optimized are set as follows:
a first set of optimized samples: taking the mixing amount of the desulfurized gypsum as a variable, each group comprises five test pieces, which are marked as D-1, D-2, D-3, D-4 and D-5, and the mixing amount of the desulfurized gypsum is respectively 10%, 20%, 30%, 40% and 50%, as shown in the table 1-1:
TABLE 1-1 study with desulfurized gypsum as a variable
Second set of optimized samples: with the fly ash content as a variable, each group included five test pieces, designated as D-6, D-7, D-8, D-9 and D-10, with the contents of 10%, 20%, 30%, 40% and 50%, respectively, as shown in tables 1-2:
table 1-2 study with fly ash as variable
Third group of optimized samples: with the amount of water reducer as a variable, each group included five test pieces, designated as D-11, D-12, D-13, D-14 and D-15, with amounts of 0.1%, 0.2%, 0.3%, 0.4% and 0.5%, respectively, as shown in tables 1-3:
tables 1 to 3 study with Water reducing agent as variable
Fourth set of optimized samples: with the fly ash content as a variable, each group included five test pieces, designated as D-16, D-17, D-18, D-19 and D-20, with the contents of 0.1%, 0.2%, 0.3%, 0.4% and 0.5%, respectively, as shown in tables 1 to 4:
tables 1 to 4 study with retarder as variable
Step two, respectively preparing comparative samples to be optimized by adopting the preparation method provided in the embodiment 4 according to different components and proportions, mixing and stirring, testing the fluidity and bleeding conditions under a gypsum-based self-leveling tester, recording test results of the fluidity and bleeding conditions, and displaying the mortar expansion degree, bleeding conditions and the flowing conditions in the states of different contents of desulfurized gypsum, fly ash, water reducing agent and retarder in tables 2-1-2-4:
TABLE 2-1 mortar Performance Table with different desulfurized gypsum contents
TABLE 2-2 mortar Performance Table at different fly ash contents
Tables 2-3 mortar Performance Table at different Water reducing agent contents
Tables 2-4 mortar Performance Table at different retarder contents
According to the data in tables 2-1 to 2-4, the mixing amount of the desulfurized gypsum is 20% -30%, the mixing amount of the fly ash is 30% -40%, the mixing amount of the water reducing agent is 0.3%, and when the mixing amount of the retarder is 0.3, the self-leveling mortar has good expansibility, fluidity, less bleeding condition and good working performance.
Step three, manufacturing test pieces according to different components and proportions, wherein 3 test pieces with the same components and proportions are arranged in each group, the 3 test pieces with the same components and proportions comprise a first cuboid test piece, a second cuboid test piece and a cube test piece, the sizes of the first cuboid test piece and the second cuboid test piece are 160mm multiplied by 40mm, the size of the cube test piece is 70.7mm multiplied by 70.7mm, the test pieces are dried at the room temperature of 20+/-5 ℃ for 24 hours, then demoulding, and then transferring the test pieces into a constant temperature and humidity curing box for curing, wherein the curing condition of the constant temperature and humidity curing box is 20+/-2 ℃, the relative humidity is 90%, the first cuboid test piece in each group is cured for 7 days, the second cuboid test piece is cured for 14 days, and the cube test piece is taken out for drying at the room temperature for 2 days after being cured for 12 days;
step four, taking out the first cuboid test piece after curing for 7 days in a constant temperature and humidity curing box, placing the first cuboid test piece in a full-braking fracture-resistant compression-resistant constant stress testing machine for fracture-resistant compression test, wherein the fracture-resistant rate is 1.2KN/s, the compression-resistant rate is 50N/s, and recording the fracture-resistant compression-resistant test result of the first cuboid test piece;
step five, taking out the second cuboid test piece after curing in a constant temperature and humidity curing box for 14 days, placing the second cuboid test piece in a full-braking fracture-resistant compression-resistant constant stress testing machine for fracture-resistant compression test, wherein the fracture-resistant rate is 1.2KN/s, the compression-resistant rate is 50N/s, and recording the fracture-resistant compression-resistant test result of the second cuboid test piece;
the test results of the test pieces obtained in the fourth step and the fifth step are shown in tables 3-1 to 3-4:
table 3-1 comparison table of average flexural compressive strength of 7d and 14d at different desulfurized gypsum contents
Table 3-2 comparison table of average flexural compressive strength of 7d and 14d at different fly ash contents
Table 3-3 comparison table of average flexural compressive strengths of 7d and 14d at different water reducing agent contents
Tables 3-4 average flexural compressive strength comparison Table at 7d and 14d for different retarder contents
As can be seen from tables 3-1 to 3-4, the self-leveling mortar has better strength when the mixing amount of the desulfurized gypsum is 20% -30%, the mixing amount of the fly ash is 30% -40%, the mixing amount of the water reducer is 0.3%, and the mixing amount of the retarder is 0.3.
Step six, curing the cube test pieces in a constant temperature and humidity curing box for 12 days, airing the cube test pieces at room temperature of 20+/-5 ℃ for 2 days, then putting the cube test pieces in an oven for drying, wherein the drying temperature is 70+/-5 ℃, recording the initial weight of the cube test pieces, placing the cube test pieces in a curing barrel for water absorption, adsorption coefficient and softening coefficient tests, and respectively recording the tested weight of the cube test pieces to obtain test results of the water absorption, adsorption coefficient and softening coefficient of each group of cube test pieces, wherein the test results are shown in fig. 1-3:
according to the test results of the water absorption, the adsorption coefficient and the softening coefficient of the figures 1-3, the mixing amount of the desulfurized gypsum is 20-30%, the mixing amount of the fly ash is 30-40%, the mixing amount of the water reducer is 0.3%, and when the mixing amount of the retarder is 0.3, the adsorption coefficient of mortar increases faster, the water absorption is lower, the inside of the material is more compact, and the softening coefficient is slower.
And step seven, comparing the test results of the step two and the step four to the step six, and obtaining the optimal components and the proportion of the self-leveling mortar of the desulfurized gypsum fly ash according to the test results.
In summary, according to the comparison of the test results, the optimal components and the proportions of the self-leveling mortar of the desulfurized gypsum fly ash are as follows: based on the total mass of the cementing material, the addition amount of the fine aggregate is 57% of the total mass of the cementing material, the addition amount of the desulfurized gypsum is 20% -30% of the total mass of the cementing material, the addition amount of the fly ash is 30% -40% of the total mass of the cementing material, the addition amount of the additive is 0.6% of the total mass of the base material, and the addition amount of the water is 35% of the total mass of the base material.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The foregoing is merely an embodiment of the present invention, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application day or before the priority date of the present invention, and can know all the prior art in the field, and have the capability of applying the conventional experimental means before the date, so that a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (8)
1. The self-leveling mortar for the desulfurized gypsum fly ash is characterized in that: the self-leveling mortar is prepared by mixing and stirring a cementing material, fine aggregate, desulfurized gypsum, fly ash, an additive and water, wherein the addition amount of the fine aggregate is 56-58% of the total mass of the cementing material, the addition amount of the desulfurized gypsum is 10-50% of the total mass of the cementing material, the addition amount of the fly ash is 10-50% of the total mass of the cementing material, the addition amount of the additive is 0.4-0.8% of the total mass of the base material, and the addition amount of the water is 34-36% of the total mass of the base material based on the total mass of the cementing material.
2. The desulfurized gypsum fly ash self-leveling mortar of claim 1, wherein: the self-leveling mortar is prepared by mixing and stirring a cementing material, fine aggregate, desulfurized gypsum, fly ash, an additive and water, wherein the addition amount of the fine aggregate is 57% of the total mass of the cementing material, the addition amount of the desulfurized gypsum is 20% -30% of the total mass of the cementing material, the addition amount of the fly ash is 30% -40% of the total mass of the cementing material, the addition amount of the additive is 0.6% of the total mass of the base material, and the addition amount of the water is 35% of the total mass of the base material based on the total mass of the cementing material.
3. The desulfurized gypsum fly ash self-leveling mortar of claim 1, wherein: the cementing material adopts P.O42.5 ordinary Portland cement, the fine aggregate adopts natural sand, the additive comprises a water reducing agent and a retarder, the water reducing agent adopts a polycarboxylic acid high-performance water reducing agent, the retarder adopts a gypsum retarder, and the mass part ratio of the water reducing agent to the retarder is 1:1.
4. The desulfurized gypsum fly ash self-leveling mortar of claim 1, wherein: the preparation method of the self-leveling mortar of the desulfurized gypsum fly ash comprises the following steps:
s1, filtering natural sand through a 2.36mm sieve, washing with water, and drying in an oven for later use;
s2, respectively filtering the desulfurized gypsum and the fly ash through a 0.075mm sieve for standby;
s3, mixing the natural sand treated by the S1 and the S2, the desulfurized gypsum and the silicate cement according to a proportion, and adding the fly ash to mix and stir uniformly to obtain a mixture;
s4, adding water into the mixture in proportion under the stirring speed of 80-100r/min, stirring and mixing, and sequentially adding the polycarboxylic acid high-performance water reducer and the gypsum coagulant under the stirring speed of 50-80r/min, stirring and mixing to obtain the self-leveling mortar of the desulfurized gypsum fly ash;
s5, pouring the self-leveling mortar of the desulfurized gypsum fly ash prepared in the S4 into the ground for self-leveling.
5. The desulfurized gypsum fly ash self-leveling mortar of claim 1, wherein: the proportioning optimization method of the self-leveling mortar of the desulfurized gypsum fly ash comprises the following steps:
step one, determining components and proportions of a comparison sample to be optimized;
step two, preparing a comparison sample to be optimized according to different components and proportions, mixing and stirring, testing the fluidity and bleeding condition under a gypsum-based self-leveling tester, and recording the test results of the fluidity and bleeding condition;
step three, manufacturing test pieces according to different components and proportions, wherein 3 test pieces with the same components and proportions are arranged in each group, the 3 test pieces with the same components and proportions comprise a first cuboid test piece, a second cuboid test piece and a cube test piece, the test pieces are dried at room temperature for 24 hours and then demolded, and then the test pieces are transferred into a constant temperature and humidity curing box for curing, wherein the first cuboid test piece in each group is cured for 7 days, the second cuboid test piece is cured for 14 days, and the cube test piece is taken out for drying at room temperature for 2 days after being cured for 12 days;
step four, taking out the first cuboid test piece after curing for 7 days in a constant temperature and humidity curing box, placing the first cuboid test piece in a full-braking fracture-resistant compression-resistant constant stress testing machine for fracture-resistant compression test, and recording the fracture-resistant compression test result of the first cuboid test piece;
step five, taking out the second cuboid test piece after curing in a constant temperature and humidity curing box for 14 days, placing the second cuboid test piece in a full-braking fracture-resistant compression-resistant constant stress testing machine for fracture-resistant compression test, and recording the fracture-resistant compression test result of the second cuboid test piece;
step six, curing the cube test pieces in a constant temperature and humidity curing box for 12 days, airing the cube test pieces at room temperature for 2 days, drying the cube test pieces in an oven, recording the initial weight of the cube test pieces, placing the cube test pieces in a curing barrel for water absorption, adsorption coefficient and softening coefficient tests, and respectively recording the tested weight of the cube test pieces to obtain test results of the water absorption, adsorption coefficient and softening coefficient of each group of cube test pieces;
and step seven, comparing the test results of the step two and the step four to the step six, and obtaining the optimal components and the proportion of the self-leveling mortar of the desulfurized gypsum fly ash according to the test results.
6. The desulfurized gypsum fly ash self-leveling mortar of claim 5, wherein: in the third step, the room temperature condition is 20+/-5 ℃, the maintenance condition of the constant temperature and humidity maintenance box is 20+/-2 ℃, and the relative humidity is 88% -92%.
7. The desulfurized gypsum fly ash self-leveling mortar of claim 5, wherein: and in the fourth step, when the first cuboid test piece and the second cuboid test piece are subjected to the fracture-resistant compression test, the fracture-resistant rate is 1.2KN/s, and the compression-resistant rate is 50N/s.
8. The desulfurized gypsum fly ash self-leveling mortar of claim 5, wherein: and in the step six, the temperature of the square test piece is 70+/-5 ℃ when the square test piece is dried.
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