CN112608115A

CN112608115A - Self-leveling mortar and preparation process thereof

Info

Publication number: CN112608115A
Application number: CN202011493576.8A
Authority: CN
Inventors: 吴红英; 朱攀峰; 姚欢荣; 赵金标; 卢信敏; 徐璐; 胡爱爱
Original assignee: Hangzhou Kangxun Construction Co ltd
Current assignee: Hangzhou Kangxun Construction Co ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-04-06

Abstract

The application relates to the field of mortar, and particularly discloses self-leveling mortar and a preparation process thereof, wherein the self-leveling mortar is mainly prepared from the following raw materials in parts by mass: 90-100 parts of aluminate cement; 5-6 parts of a water reducing agent; 4-5 parts of a leveling agent; 2-2.5 parts of a defoaming agent; 70-75 parts of modified quartz sand; 20-25 parts of emulsion additive; 20-25 parts of water; the modified quartz sand is ethylenediamine modified quartz sand; the emulsion additive is a mixed emulsion of acrylate emulsion and epoxy resin emulsion, and the dosage ratio of the acrylate emulsion to the epoxy resin emulsion is 3 (1-2). The self-leveling mortar prepared by the application has stronger wear resistance, and the surface is smoother and is directly used as the surface layer of the floor.

Description

Self-leveling mortar and preparation process thereof

Technical Field

The application relates to the technical field of mortar, in particular to self-leveling mortar and a preparation process thereof.

Background

The self-leveling mortar is one of functional building mortar, has high fluidity, can be automatically leveled to form a flat plane, reduces the construction difficulty, and saves a large amount of manpower and material resources. The cement-based self-leveling material has the characteristics of high strength, good fluidity, good water resistance and the like, and is widely applied to grain depots, granaries, dams, underground inspection, water conservancy and hydropower ground finishing and the like.

For example, the self-leveling mortar disclosed in chinese patent application with application number CN201811324513.2 comprises the following raw materials: 18-23 parts of Portland cement, 7.5-12.5 parts of light-burned magnesium oxide, 35-44 parts of heavy calcium carbonate, 15-25 parts of calcium hexametaphosphate, 5-10 parts of superfine mineral powder, 0.2-0.4 part of coal gangue, 0.6-0.8 part of titanium dioxide, 0.2-0.3 part of coupling agent, 0.5-1 part of surfactant and 1-7 parts of water reducing agent. The components are uniformly mixed and then can be used for leveling and finishing the ground.

The existing self-leveling mortar has the problem of insufficient wear resistance, so the existing self-leveling mortar cannot be directly used as a surface layer of a floor.

Disclosure of Invention

In order to improve the wear resistance of self-leveling, the application provides self-leveling mortar and a preparation process thereof.

In a first aspect, the present application provides a self-leveling mortar, which adopts the following technical scheme:

the self-leveling mortar is mainly prepared from the following raw materials in parts by mass:

90-100 parts of aluminate cement;

5-6 parts of a water reducing agent;

4-5 parts of a leveling agent;

2-2.5 parts of a defoaming agent;

70-75 parts of modified quartz sand;

20-25 parts of emulsion additive;

20-25 parts of water;

the modified quartz sand is ethylenediamine modified quartz sand; the emulsion additive is a mixed emulsion of acrylate emulsion and epoxy resin emulsion, and the dosage ratio of the acrylate emulsion to the epoxy resin emulsion is 3 (1-2).

By adopting the technical scheme, the emulsion additive formed by mixing the acrylate emulsion and the epoxy resin emulsion is added into the mortar, and both the acrylate emulsion and the epoxy resin emulsion have the advantages of good wear resistance and smooth surface after being cured because the acrylate emulsion and the epoxy resin emulsion are high-molecular polymers, and the wear resistance and the smoothness of the cured surface can be improved by curing the acrylate emulsion and the epoxy resin emulsion together with the mortar as raw materials. And because the ethylenediamine can be subjected to ring-opening crosslinking with the epoxy group of the epoxy resin to be cured into a polymer with higher molecular weight, the quartz sand modified by the ethylenediamine is used as a filler, so that the quartz sand and the cement can be more firmly combined, and the wear resistance of the surface of the mortar is further improved.

The heat is released in the cement curing process, so that the crosslinking of the epoxy resin is facilitated, the acrylate emulsion can reach the glass transition temperature more easily, the curing of the acrylate emulsion is facilitated, the time required by mortar curing is reduced, and the early strength of the mortar is improved to a certain extent. And two kinds of emulsions are used simultaneously, so that the mortar has better and more comprehensive performance, higher wear resistance, better weather resistance, water resistance and toughness.

And the early strength of the mortar can be improved by adopting the aluminate cement, and the problem of early strength reduction caused by adding the emulsion can be effectively solved. The water reducing agent and the flatting agent in the raw materials can adjust the fluidity of the mortar, so that the mortar is easier to level, and the defoaming agent is used for reducing bubbles generated in the mixing process of the mortar and improving the surface smoothness of the solidified mortar.

Preferably, the raw material also comprises 0.8-1 part by mass of methyl cellulose.

By adopting the technical scheme, because the epoxy resin and the ethylenediamine generate certain heat in the reaction crosslinking process, and the methylcellulose has unique thermal gel property and can form a gel state after being heated, the early strength of the mortar can be effectively improved in the mortar curing and heat releasing process, the released heat can be absorbed to a certain extent, the explosive aggregation caused by the large heat release amount of the epoxy resin can be prevented, and the wear resistance of the mortar can be improved.

Preferably, the raw material also comprises 12-15 parts of fly ash by mass.

By adopting the technical scheme, the coal ash can improve the workability between the emulsion additive and the quartz sand, so that the emulsion additive is more uniformly dispersed in the system. The fly ash can absorb heat released in the curing process of cement and epoxy resin, so that the explosive aggregation caused by overhigh temperature in the curing process is further reduced, the mortar is more uniform after being cured, and the wear resistance is improved.

Preferably, the particle size of the modified quartz sand is 100-140 meshes.

By adopting the technical scheme, the quartz sand with the particle size can ensure the fluidity and the strength of the self-leveling mortar, improve the binding capacity between the emulsion additive and the quartz sand as much as possible and ensure that the surface of the solidified mortar has higher wear resistance.

Preferably, the epoxy value of the epoxy resin used in the emulsion additive is 0.4 to 0.45.

By adopting the technical scheme, the epoxy resin with the epoxy value is used, so that the mortar has higher strength after being cured and better wear resistance.

Preferably, the emulsion additive has a solids content of 45 to 50%.

By adopting the technical scheme, the emulsion additive with the solid content ensures the wear resistance of the surface of the solidified mortar, and simultaneously, the mortar can have more proper fluidity and viscosity, thereby being beneficial to construction and further improving the smoothness of the surface of the solidified mortar.

In a second aspect, the application provides a preparation process of self-leveling mortar, which adopts the following technical scheme:

the method comprises the following process steps:

s1: modification of quartz sand: soaking quartz sand in ethylenediamine, stirring at 70-75 deg.C and 80-100r/min for 40-50min, and filtering to obtain modified quartz sand;

s2: mixing the acrylic ester emulsion and the epoxy resin emulsion in proportion to obtain an emulsion additive;

s3: preparing mortar: mixing cement, a water reducing agent, a leveling agent, a defoaming agent, modified quartz sand, methyl cellulose and fly ash, adding part of water into the mixture for mixing to make the mixture viscous, adding an emulsion additive and the rest water, mixing for 50-60s at the rotating speed of 500r/min, reducing the stirring speed to 100-150r/min, and continuing stirring for 50-60s to obtain the leveling mortar.

By adopting the technical scheme, the quartz sand is heated in the modification process of the quartz sand in the step S1, so that the ethylenediamine is more fully and firmly attached to the surface of the quartz sand; in the preparation process of the S3 mortar, the dry powder components are mixed, part of water is added to be in a sticky state, and then the emulsion additive is added, so that the dry powder components can be mixed more uniformly in the adding mode, and the condition of uneven mixing caused by the increase of viscosity after the emulsion additive is added is avoided; the emulsion additive is added, firstly, the high-speed stirring and mixing are carried out, so that the emulsion additive can be more effectively dispersed, and then, the low-speed stirring is carried out, so that air bubbles generated in the high-speed stirring process can be removed, the mortar is more uniform, and the surface after solidification is smoother.

Preferably, in step S1, the quartz sand is soaked in ethylenediamine and is subjected to ultrasonic treatment while being stirred, wherein the frequency of the ultrasonic wave is 15-20kHz, and the power is 180-200W.

By adopting the technical scheme, fine micropores can be generated on the surface of the quartz sand through ultrasonic treatment in the modification process, so that the ethylenediamine is more fully and firmly combined with the quartz sand, and the binding capacity between the cured epoxy resin and the quartz sand can be improved.

In summary, the present application includes at least one of the following beneficial technical effects:

1. according to the method, an emulsion additive formed by mixing an acrylate emulsion and an epoxy resin emulsion is added into the self-leveling mortar, and the ethylene diamine is used for modifying the quartz sand, so that the surface wear resistance of the self-leveling mortar after curing is improved by utilizing the characteristics of a high polymer; and the early strength of the mortar is improved by using the aluminate cement, and the problem of insufficient early strength caused by adding the emulsion is solved.

2. The application also uses the methyl cellulose, so that the early strength of the mortar can be further improved, the discharged heat can be absorbed to a certain degree, the explosive aggregation condition of epoxy resin caused by large heat release amount is prevented, and the surface of the solidified mortar is smoother and smoother.

3. The application also uses fly ash to improve the workability between the emulsion additive and the quartz sand and further prevent excessive heat release during the curing process.

4. The application also provides the particle size of the quartz sand and the preferable ranges of the epoxy value and the solid content of the emulsion, so that the mortar has better performance.

5. The application also provides a preparation process of the self-leveling mortar, and the self-leveling mortar with better properties can be prepared by using the process.

6. In the self-leveling mortar preparation process, ultrasonic treatment is adopted during modification of quartz sand, so that the performance of the modified quartz sand is improved.

Detailed Description

Examples

Example 1: a self-leveling mortar, which is prepared from a mortar,

the compound is prepared from the following raw materials: 90kg of aluminate cement (CA-50), 5kg of water reducing agent (HSB aliphatic high-efficiency water reducing agent), 4kg of flatting agent (powdered sulfonated melamine), 2kg of defoaming agent (AT-720B polyether defoaming agent), 70kg of modified quartz sand, 20kg of emulsion additive and 20kg of water.

The modified quartz sand is ethylenediamine modified quartz sand, and the particle size of the quartz sand is 90 meshes; the emulsion additive is a mixed emulsion of 15kg of acrylate emulsion and 5kg of epoxy resin emulsion, the epoxy value of the used epoxy resin is 0.51, and the solid content of the mixed emulsion additive is 40%.

The preparation process comprises the following steps:

s1: modification of quartz sand: soaking quartz sand in ethylenediamine, stirring at 70 deg.C at 80r/min for 50min, and filtering to obtain modified quartz sand;

s2: stirring the acrylate emulsion and the epoxy resin emulsion at the rotating speed of 200r/min for 10min to obtain an emulsion additive;

s3: preparing mortar: mixing cement, a water reducing agent, a flatting agent, a defoaming agent and modified quartz sand, and adding water with half of the total water consumption into the mixture for mixing to make the mixture sticky. Then adding the emulsion additive and the rest water, mixing for 60s at the rotating speed of 400r/min, reducing the stirring speed to 100r/min, and continuing stirring for 60s to obtain the leveling mortar.

Example 2: the self-leveling mortar is different from the self-leveling mortar in example 1 in the use amount of each component, the performance parameters of the components and the preparation process parameters, and the specific use amount and the performance parameters of each component are shown in table 1.

The preparation process comprises the following steps:

s1: modification of quartz sand: soaking quartz sand in ethylenediamine, stirring at 75 deg.C at 100r/min for 40min, and filtering to obtain modified quartz sand;

s2: stirring the acrylic ester emulsion and the epoxy resin emulsion for 8min at the rotating speed of 250r/min to obtain an emulsion additive;

s3: preparing mortar: mixing cement, a water reducing agent, a flatting agent, a defoaming agent and modified quartz sand, and adding water with half of the total water consumption into the mixture for mixing to make the mixture sticky. Then adding the emulsion additive and the rest water, mixing for 50s at the rotating speed of 500r/min, reducing the stirring speed to 150r/min, and continuing stirring for 50s to obtain the leveling mortar.

Examples 3 to 4: a self-leveling mortar, which is prepared from a mortar,

the difference from example 1 is that methyl cellulose is also added in the raw material, and the specific dosage and performance parameters of each component are shown in table 1.

Step S3 changes to: preparing mortar: mixing cement, a water reducing agent, a flatting agent, a defoaming agent, modified quartz sand and methyl cellulose, and adding water with half of the total water consumption into the mixture for mixing to make the mixture viscous. Then adding the emulsion additive and the rest water, mixing for 50s at the rotating speed of 500r/min, reducing the stirring speed to 150r/min, and continuing stirring for 50s to obtain the leveling mortar.

The steps of the rest process steps are the same.

Examples 5 to 6: a self-leveling mortar, which is prepared from a mortar,

the difference from the example 1 is that fly ash is also added into the raw materials, and the specific dosage and performance parameters of each component are shown in the table 1.

Step S3 changes to: preparing mortar: mixing cement, a water reducing agent, a flatting agent, a defoaming agent, modified quartz sand and fly ash, and adding water with half of the total water consumption into the mixture for mixing to make the mixture sticky. Then adding the emulsion additive and the rest water, mixing for 50s at the rotating speed of 500r/min, reducing the stirring speed to 150r/min, and continuing stirring for 50s to obtain the leveling mortar.

The steps of the rest process steps are the same.

Examples 7 to 8: a self-leveling mortar, which is prepared from a mortar,

the difference from example 1 is that the specific amounts of the components and the performance parameters are shown in Table 1, which are different in the particle size of the quartz sand used.

The process steps are the same as in example 1.

Examples 9 to 10: a self-leveling mortar, which is prepared from a mortar,

the difference from example 1 is that the epoxy value of the epoxy resin used is different, and the specific amounts of the components and the performance parameters are shown in Table 1.

The process steps are the same as in example 1.

Examples 11 to 12: a self-leveling mortar, which is prepared from a mortar,

the difference from example 1 is that the emulsion additive has a different solid content after mixing, and the specific amounts of the components and performance parameters are shown in table 1.

The process steps are the same as in example 1.

Example 13: a self-leveling mortar, which is prepared from a mortar,

the difference from the example 1 is that the raw materials are added with methyl cellulose and fly ash at the same time, the particle size of the used quartz sand, the epoxy value of the epoxy resin and the solid content of the emulsion additive are all different, and the specific dosage and performance parameters of each component are shown in table 1.

Step S3 changes to: preparing mortar: mixing cement, a water reducing agent, a flatting agent, a defoaming agent, modified quartz sand, methyl cellulose and fly ash, and adding water with half of the total water consumption into the mixture for mixing to make the mixture sticky. Then adding the emulsion additive and the rest water, mixing for 50s at the rotating speed of 500r/min, reducing the stirring speed to 150r/min, and continuing stirring for 50s to obtain the leveling mortar.

The steps of the rest process steps are the same.

Example 14: a self-leveling mortar, which is prepared from a mortar,

the difference from example 1 is that ultrasonic treatment is used in process step S1. The specific amounts of the components and performance parameters are shown in table 1.

Step S1 changes to: soaking quartz sand in ethylenediamine, stirring at 70 deg.C and 80r/min for 50min, performing ultrasonic treatment simultaneously with ultrasonic frequency of 18kHz and power of 200W, and filtering to obtain modified quartz sand.

The steps of the rest process steps are the same.

Table 1: EXAMPLES 1-14 amounts of the respective Components and Property parameters

Comparative example

Comparative example 1: a self-leveling mortar, which is prepared from a mortar,

the compound is prepared from the following raw materials: 18kg of Portland cement, 7.5kg of light-burned magnesium oxide, 35kg of heavy calcium carbonate, 15kg of calcium hexametaphosphate, 5kg of superfine mineral powder, 0.2kg of coal gangue, 0.6kg of titanium dioxide, 0.5kg of silane coupling agent KH-5700.2 kg of sodium octadecyl benzene sulfonate and 1kg of sulfonic acid water reducing agent.

The preparation method comprises the following steps: mixing the above materials.

Comparative example 2: a self-leveling mortar is different from the mortar in example 1 in that the emulsion additive is an epoxy resin emulsion, and the specific dosage and performance parameters of the other components are shown in Table 2.

The process steps are changed into:

s2: preparing mortar: mixing cement, a water reducing agent, a flatting agent, a defoaming agent and modified quartz sand, and adding water with half of the total water consumption into the mixture for mixing to make the mixture sticky. Then adding the emulsion additive and the rest water, mixing for 60s at the rotating speed of 400r/min, reducing the stirring speed to 100r/min, and continuing stirring for 60s to obtain the leveling mortar.

Comparative example 3: the self-leveling mortar is different from the self-leveling mortar in example 1 in that unmodified common quartz sand is used as a raw material, and the specific dosage and performance parameters of the other components are shown in table 2.

The process steps are changed into:

s1: stirring the acrylate emulsion and the epoxy resin emulsion at the rotating speed of 200r/min for 10min to obtain an emulsion additive;

s2: preparing mortar: mixing cement, a water reducing agent, a flatting agent, a defoaming agent and quartz sand, and adding water with half of the total water consumption into the mixture for mixing to make the mixture sticky. Then adding the emulsion additive and the rest water, mixing for 60s at the rotating speed of 400r/min, reducing the stirring speed to 100r/min, and continuing stirring for 60s to obtain the leveling mortar.

Comparative example 4: the self-leveling mortar is different from the self-leveling mortar in example 1 in that unmodified common quartz sand is used as a raw material, an emulsion additive is an acrylate emulsion, and the specific using amounts and performance parameters of the other components are shown in table 2.

The process steps are changed into:

preparing mortar: mixing cement, a water reducing agent, a flatting agent, a defoaming agent and quartz sand, and adding water with half of the total water consumption into the mixture for mixing to make the mixture sticky. Then adding the emulsion additive and the rest water, mixing for 60s at the rotating speed of 400r/min, reducing the stirring speed to 100r/min, and continuing stirring for 60s to obtain the leveling mortar.

Table 2: comparative examples 2 to 3 amounts of the respective Components and Property parameters

Performance test

Test one: abrasion resistance test

The test principle is as follows: and (3) carrying out a wear resistance test on the self-leveling surface by using a wear resistance instrument, and comparing the wear resistance by measuring the mass difference before and after wear.

Test equipment: DR-902 abrasion resistance tester, electronic balance (precision 0.01 g).

Test subjects: examples 1-14, comparative examples 1-4.

Sample preparation:

1. c-50 common cement mortar is poured into a disc-shaped mould with the diameter of 10cm, the thickness of the mortar is 0.5cm, and the sample substrate is obtained after curing for 28 days.

2. And (3) continuously pouring the self-leveling mortar prepared in each example and each comparative example into the mould of each substrate, wherein the thickness of the self-leveling mortar is 2mm, so as to obtain test samples, and preparing 3 test samples in each example and each comparative example.

Test procedure: the test samples of each example and comparative example were air-dried for 8 days, and then released from the mold, and the mass M of each test sample was weighed using an electronic balance₁Then, a wear resistance test is carried out on the test samples by using a wear resistance tester, the load used for the test is 1kg, the rotating speed is 65r/min, the number of rotating turns is 3000r, dust on the surface of each test sample is removed after the test is finished, and the mass M of each test sample is measured by using an electronic balance₂The mass difference between the front and rear of each test sample was calculated, and the average M of the mass differences between each group of examples and comparative examples was calculated_X(g)，M_X＝(M₁-M₂) The results of the tests are shown in Table 3 below.

Table 3: m of examples 1 to 14 and comparative examples 1 to 4_XValue (g)

By comparing the data of examples 1-2 with comparative example 1 in Table 3, M of examples 1-2 can be found_XThe values are much smaller than in comparative example 1, which shows that the self-leveling mortars obtained in examples 1-2 have better wear resistance. This is because the emulsion additive prepared by mixing the acrylic ester emulsion and the epoxy resin emulsion is used in the example 1-2, and the ethylenediamine modified quartz sand is used, because the acrylic ester emulsion and the epoxy resin emulsion are both high molecular polymers, and the cured products have the advantages of good wear resistance and smooth surface, the wear resistance and the smoothness of the cured surface can be improved by using the acrylic ester emulsion and the epoxy resin emulsion as raw materials and curing the raw materials together with mortar. And because the ethylenediamine can be subjected to ring-opening crosslinking with the epoxy group of the epoxy resin to be cured into a polymer with higher molecular weight, the quartz sand modified by the ethylenediamine is used as a filler, so that the quartz sand and the cement can be more firmly combined, and the wear resistance of the surface of the mortar is further improved.

Comparing the data in Table 3 for examples 1-2 with comparative example 2, M for examples 1-2 can be found_XThe values are much smaller than in comparative example 2, which shows that the self-leveling mortars obtained in examples 1-2 have better wear resistance. This indicates that the use of a single epoxy resin emulsion as an emulsion additive provides far less abrasion resistance than the use of a single epoxy resin emulsion as an emulsion additiveA composite emulsion of acrylate and epoxy resin is used. The reason is that the epoxy resin and the ethylenediamine can emit heat in the reaction crosslinking process, so that the acrylate emulsion can reach the glass transition temperature more easily, the curing of the acrylate emulsion is facilitated, and the wear resistance of the mortar is improved.

Comparing the data in Table 3 for examples 1-2 with comparative examples 3-4, M for examples 1-2 can be found_XValues are much smaller than comparative examples 3-4, and M of comparative example 4_XThe value is highest. This shows that the self-leveling mortars prepared in examples 1-2 have better wear resistance and that comparative example 4 has the worst wear resistance. Therefore, the single epoxy resin emulsion is difficult to achieve a good effect, and the wear resistance of the mortar can be effectively improved only by matching with the modified quartz sand modified by the ethylenediamine.

By comparing the data in Table 3 for examples 1-2 with examples 3-4, M for examples 3-4 can be found_XThe values are smaller than in examples 1-2, which shows that the self-leveling mortars obtained in examples 3-4 have better wear resistance. This is because, in examples 3 to 4, methylcellulose was used, and the methylcellulose gelled by the curing heat of the mortar and the crosslinking heat release of the epoxy resin, thereby improving the abrasion resistance of the mortar.

Comparing the data in Table 3 for examples 1-2 and examples 5-6, M for examples 5-6 can be found_XThe values are smaller than in examples 1-2, which shows that the self-leveling mortars obtained in examples 5-6 have better wear resistance. The reason is that the fly ash is added in the examples 5-6, and the fly ash can also absorb the heat release in the curing process of the cement and the epoxy resin, so that the implosion caused by overhigh temperature in the curing process is further reduced, the mortar is more uniform after being cured, and the wear resistance is improved.

By comparing the data in Table 3 for examples 1-2 with examples 7-8, M for examples 7-8 can be found_XThe values are smaller than in examples 1-2, which shows that the self-leveling mortars obtained in examples 7-8 have better wear resistance. Thus, it can be seen that the silica sand used in examples 7 to 8 had a particle size in a more preferable range, and that the resulting mortar had a higher wear resistance in this particle size range.

Comparison of examples 1-2 with example 9-10 data, M of examples 9-10 can be found_XThe values are less than in examples 1-2, which indicates that the self-leveling mortars prepared in examples 9-10 have better wear resistance. Thus, it is possible to explain the technical solutions in which the epoxy value of the epoxy resins selected in examples 9 to 10 is more excellent. This is probably because the epoxy resin with the epoxy value is selected to better match with the modified quartz sand, so as to achieve better crosslinking effect.

Comparing the data in Table 3 for examples 1-2 and examples 11-12, M for examples 11-12 can be found_XThe values are smaller than in examples 1-2, which shows that the self-leveling mortars obtained in examples 11-12 have better wear resistance. Thus, the preferred embodiments of examples 11-12 are illustrated for the emulsion additive solids content. This is probably because, with the mixed emulsion of solid content, colloidal particles in the emulsion can be more sufficiently and effectively dispersed in the mortar, achieving better crosslinking and improving uniformity.

Comparing the data in Table 3 for examples 1-12 with example 13, M for example 13 can be seen_XThe values are less than examples 1-12, which indicates that the self-leveling mortar produced in example 13 has the best wear resistance. The analysis before the addition of the methyl cellulose and the fly ash can show that the better wear resistance can be achieved by simultaneously using the more preferable particle size of the quartz sand, the epoxy value of the epoxy resin and the solid content of the emulsion additive.

Comparing the data in Table 3 for examples 1-2 with example 14, M for example 14 can be found_XThe values are less than in examples 1-2, which demonstrates the better wear resistance of the self-leveling mortars prepared in example 14. Therefore, the ultrasonic treatment is adopted in the process of preparing the modified quartz sand, and the wear resistance of the mortar can be improved. This is because the ultrasonic treatment can generate fine micropores on the surface of the silica sand, so that the ethylenediamine can be more sufficiently and firmly bonded to the silica sand, and the bonding ability between the epoxy resin and the silica sand after curing can be improved.

And (2) test II: early strength test principle: the pressure tester is used for carrying out pressure test on the test samples at the early stage of consolidation, and the early strength of each test sample can be judged according to the magnitude of the compressive strength.

Test equipment: PS-9305S pressure tester.

Test subjects: examples 1-4, comparative examples 1-4.

Sample preparation: the same procedure was used for test one.

The test steps are as follows: the test samples of each example and comparative example were air-dried for 10 hours and then demolded, and the compressive strength of each test sample was measured using a pressure tester and the average value fcu (mpa) was calculated, and the test results are shown in table 4 below.

Table 4: examples 1 to 4 and comparative examples 1 to 4 early compressive Strength Fcu (MPa)

Comparing the data of examples 1-2 and comparative examples 1-4 in Table 4, it can be seen that the Fcu values for examples 1-2 are much greater than for comparative examples 1-4. Continuing to compare the data in Table 4 for examples 1-2 and examples 3-4, it can be seen that example 3-1 has a greater value of Fcu than example 1-2. It can be shown that the early strength of examples 1-2 is stronger than that of comparative examples 1-4, while the early strength of examples 3-4 is stronger than that of examples 1-2. This is because the curing heat of cement contributes to the crosslinking of the epoxy resin, the vitrification of the acrylate emulsion, and the curing of the methyl cellulose, and because the time required for the resin-based substance to cure is much shorter than the time required for the cement to cure, the epoxy resin, the acrylate, and the methyl cellulose after being preferentially cured contribute to the improvement of the early strength of the mortar.

Further, by combining the strength requirement of the resin cement composite mortar self-leveling system of ≧ 25MPa in Table 5.1.3 of technical Standard for self-leveling ground engineering JGJ/T175-2018, examples 1-2 and 3-4 can achieve higher strength at an early stage and approach the compressive strength specified by the technical Standard. This facilitates subsequent construction and prevents local implosion of the resin due to too slow hardening rate, thereby providing the mortar with better uniformity and wear resistance.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. A self-leveling mortar is characterized in that: the material is mainly prepared from the following raw materials in parts by mass:

90-100 parts of aluminate cement;

5-6 parts of a water reducing agent;

4-5 parts of a leveling agent;

2-2.5 parts of a defoaming agent;

70-75 parts of modified quartz sand;

20-25 parts of emulsion additive;

20-25 parts of water;

2. The self-leveling mortar of claim 1, wherein: the raw material also comprises 0.8-1 part of methyl cellulose by mass.

3. The self-leveling mortar of claim 1, wherein: the raw material also comprises 12-15 parts of fly ash by mass.

4. The self-leveling mortar of claim 1, wherein: the particle size of the modified quartz sand is 100-140 meshes.

5. The self-leveling mortar of claim 1, wherein: the epoxy value of the epoxy resin used in the emulsion additive is 0.4-0.45.

6. The self-leveling mortar of claim 1, wherein: the solid content of the emulsion additive is 45-50%.

7. A self-leveling mortar preparation process is characterized by comprising the following steps: the method comprises the following process steps:

8. The self-leveling mortar preparation process according to claim 7, characterized in that: in step S1, the quartz sand is soaked in ethylenediamine and is subjected to ultrasonic treatment while being stirred, wherein the frequency of the ultrasonic wave is 15-20kHz, and the power is 180-200W.