CN115650693B - Magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand and preparation method thereof - Google Patents
Magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand and preparation method thereof Download PDFInfo
- Publication number
- CN115650693B CN115650693B CN202210129667.6A CN202210129667A CN115650693B CN 115650693 B CN115650693 B CN 115650693B CN 202210129667 A CN202210129667 A CN 202210129667A CN 115650693 B CN115650693 B CN 115650693B
- Authority
- CN
- China
- Prior art keywords
- machine
- phosphate
- made sand
- component
- magnesium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Abstract
The invention discloses magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand and a preparation method thereof, wherein the magnesium phosphate repair mortar comprises the following components in parts by weight: 20-30 parts of ammonium dihydrogen phosphate, 40-65 parts of magnesium oxide, 40-90 parts of machine-made sand, 20-30 parts of admixture, 2-10% of retarder component, 0.2-0.3% of defoaming component A, 1-1.5% of defoaming component B and 12-18% of cementing material. According to the invention, by adding the composite defoaming component and compounding the organic defoaming component and the inorganic mineral material, an obvious defoaming effect is achieved, the mechanical property and the durability of the magnesium phosphate mortar prepared from the machine-made sand can be effectively reduced, and the technical problem that the magnesium phosphate mortar prepared from the monoammonium phosphate and the machine-made sand expands is successfully solved.
Description
Technical Field
The invention relates to magnesium phosphate repair mortar and a preparation method thereof, in particular to magnesium phosphate repair mortar based on monoammonium phosphate and limestone machine-made sand and a preparation method thereof, and belongs to the technical field of building materials.
Background
The magnesium phosphate repair mortar is a mixture which is prepared from magnesium oxide, phosphate, retarding component, mineral admixture, additive component, fine aggregate and other modified or filled components according to a proper proportion, is uniformly mixed with water according to a certain proportion when in use, is used for quickly repairing buildings and structures, has the characteristics of high setting speed, high early strength and small shrinkage, and can form stronger binding force with silicate cement-based materials. The magnesium phosphate repair mortar is particularly suitable for emergency repair of projects such as roads, bridges, municipal works and the like due to the excellent performance.
At present, phosphate components in magnesium phosphate mortar mainly comprise potassium dihydrogen phosphate and ammonium dihydrogen phosphate, and the performance of the potassium dihydrogen phosphate is relatively stable, but the cost is far higher than that of the ammonium dihydrogen phosphate, so that the magnesium phosphate mortar prepared from the potassium dihydrogen phosphate has higher price and is limited in application. Although the cost of the monoammonium phosphate is lower, the requirement on the fine aggregate is higher due to the chemical property of the monoammonium phosphate, at present, quartz sand is mainly used for preparing the magnesium phosphate mortar, and compared with common machine-made sand, the quartz sand resources are more scarce, and the cost is higher. The common limestone machine-made sand is used as the fine aggregate, so that the preparation cost of the magnesium phosphate mortar can be obviously reduced, and meanwhile, the wide application of the common machine-made sand is beneficial to promoting the building material utilization of construction wastes, and the method has good economic and social benefits. However, the existing problem is that if the magnesium phosphate mortar is prepared by using monoammonium phosphate and machine-made sand, a large amount of gas is generated due to the chemical reaction between stone powder and monoammonium phosphate in the common machine-made sand, so that the mortar mixture has serious foaming and expansion phenomena, and the mortar mixture cannot be used normally.
Therefore, an effective technical method is needed to be developed to solve the problem of foaming expansion caused by machine-made sand powder and realize the effective utilization of the machine-made sand in the preparation of the magnesium phosphate rapid repair mortar.
Disclosure of Invention
Aiming at the defects and shortcomings existing in the background technology, the invention improves and innovates the defects, and aims to provide the method which can solve the foaming expansion problem caused by machine-made sand stone powder, realize the effective utilization of machine-made sand in the preparation of magnesium phosphate quick repair mortar, solve the technical problems that the expansion occurs and the strength is reduced when the magnesium phosphate mortar is prepared by using monoammonium phosphate and machine-made sand, realize the preparation of the magnesium phosphate mortar by using common stone powder-containing machine-made sand to replace quartz sand, reduce the cost, ensure the performance, and facilitate the local material taking, thereby being convenient for the popularization and the application of the magnesium phosphate mortar in the engineering repair field.
The invention also aims to prepare the magnesium phosphate repair mortar by adopting the ammonium dihydrogen phosphate and the machine-made sand with lower cost, thereby reducing the material cost of the magnesium phosphate mortar. If limestone machine-made sand is directly used to prepare magnesium ammonium phosphate mortar, the machine-made sand contains a large amount of stone powder (CaCO is the main component) 3 ) Can react with ammonium dihydrogen phosphate to generate carbon dioxide gas, resulting in severe foaming phenomenon and volume expansion, and further resulting in significant reduction of strength of the magnesium phosphate mortar. In order to reasonably and effectively utilize limestone machine-made sand to prepare economic and high-performance magnesium phosphate mortar, the invention adds the composite defoaming component, and simultaneously combines the organic defoaming component and the inorganic mineral material to achieve obvious defoaming effect, thereby effectively reducing expansion, improving the mechanical property and durability of the magnesium phosphate mortar prepared by machine-made sand, and successfully solving the technical problem of expansion of the magnesium phosphate mortar prepared by using monoammonium phosphate and machine-made sand.
In order to solve the problems and achieve the aim of the invention, the magnesium phosphate repair mortar based on monoammonium phosphate and limestone machine-made sand and the preparation method thereof are realized by adopting the following design structure and the following technical scheme:
the magnesium phosphate repair mortar based on the monoammonium phosphate and limestone machine-made sand comprises the following components in parts by weight: 20-30 parts of ammonium dihydrogen phosphate, 40-65 parts of magnesium oxide, 40-90 parts of machine-made sand, 20-30 parts of admixture, 2-10% of retarder component, 0.2-0.3% of defoaming component A, 1-1.5% of defoaming component B and 12-18% of cementing material.
Preferably, the cementing material refers to the mass sum of ammonium dihydrogen phosphate, magnesium oxide and admixture.
Preferably, the monoammonium phosphate has a particle size of 0.2 to 25 μm.
Preferably, the magnesia is calcined magnesia which is prepared by calcining magnesite at a high temperature exceeding 1700 ℃ and grinding, and the grain size is 0.2-80 mu m.
Preferably, the stone powder content in the machine-made sand is 0-20% of the mass of the machine-made sand, the stone powder is a component with the grain diameter of less than 0.075 mu m in the machine-made sand, and the main chemical component is CaCO3.
Preferably, the admixture is one or a mixture of more of fly ash, silica fume, slag powder and steel slag powder.
Preferably, the retarding component is one or a mixture of a plurality of borax, sucrose, citric acid, lactic acid, sodium tripolyphosphate, disodium hydrogen phosphate, sodium sulfate decahydrate and anhydrous sodium acetate.
Preferably, the defoaming component A is polyether modified organic silicon.
Preferably, the defoaming component B is a silicate product, and the main components are tricalcium aluminate, tricalcium silicate and dicalcium silicate.
More preferably, the method for preparing magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand comprises the following steps:
(1) Weighing ammonium dihydrogen phosphate, magnesium oxide, machine-made sand, admixture, retarding component, defoaming component A, defoaming component B and water according to the mass parts;
(2) Mixing all solid components of the weighed monoammonium phosphate, magnesium oxide, machine-made sand, admixture, retarding component and defoaming component B, and stirring for 1-2 min by adopting a stirrer or a manual stirring mode to uniformly mix;
(3) Mixing the weighed liquid components such as water, the defoaming component A and the like in advance, pouring the mixture into the uniformly mixed solid components, and continuously adopting a mortar stirrer or a manual mode to stir for 2-3 min until the mixture is uniformly stirred, thus obtaining the magnesium phosphate repair mortar;
(4) Pouring or plastering the mixed magnesium phosphate repair mortar according to the requirement.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the research on the influence rule of different stone powder contents (0-20%) in common machine-made sand on the performance of the prepared magnesium phosphate mortar, including the volume expansion rate, the compressive strength and the durability, is realized, the organic and inorganic defoaming components are mixed in a compound manner, the proportioning and the consumption of the defoaming components are optimized, the defoaming technical scheme for effectively reducing the expansion and improving the strength and the durability of the magnesium phosphate mortar prepared by using the machine-made sand with the stone powder content of 0-20% is provided, the technical problems that the expansion and the strength reduction are brought about when the magnesium phosphate mortar is prepared by using the monoammonium phosphate and the machine-made sand are solved, the performance is ensured when the common stone powder-containing machine-made sand is used for replacing quartz sand, the cost is reduced, the local material is also facilitated, and the popularization and the application of the magnesium phosphate mortar in the engineering repair field are facilitated;
2. the invention adopts ammonium dihydrogen phosphate and machine-made sand with lower cost to prepare the magnesium phosphate repair mortar, thereby reducing the material cost of the magnesium phosphate mortar. If limestone machine-made sand is directly used to prepare magnesium ammonium phosphate mortar, the machine-made sand contains a large amount of stone powder (CaCO is the main component) 3 ) Can react with ammonium dihydrogen phosphate to generate carbon dioxide gas, resulting in severe foaming phenomenon and volume expansion, and further resulting in significant reduction of strength of the magnesium phosphate mortar. In order to reasonably and effectively utilize limestone machine-made sand to prepare economic and high-performance magnesium phosphate mortar, the invention adds the composite defoaming component, and simultaneously combines the organic defoaming component and the inorganic mineral material to achieve obvious defoaming effect, so that the expansion can be effectively reduced, the mechanical property and durability of the magnesium phosphate mortar prepared by the machine-made sand can be improved, and the technical problem that the magnesium phosphate mortar prepared by using monoammonium phosphate and the machine-made sand expands can be successfully solved;
3. the limestone machine-made sand magnesium phosphate mortar prepared by the method can reach compressive strength of more than 35MPa for 1h at normal temperature of 20 ℃, the 28d interface bonding strength can reach more than 4MPa, and the limestone machine-made sand magnesium phosphate mortar has good volume stability (the volume expansion rate before setting and hardening is less than 1%, the volume shrinkage rate after setting and hardening is less than 0.01%), the impermeability pressure is more than 0.7MPa, and the electric flux is less than 1000 ℃.
Detailed Description
In order to make the technical means, the inventive features, the achieved objects and the effects of the present invention easy to understand, the technical solution of the present invention will be described in further detail below with reference to the specific embodiments, and it should be noted that the embodiments and the features in the embodiments in the present application may be combined without conflict. The present invention will be described in detail with reference to examples.
Comparative example 1
The magnesium phosphate mortar in the comparative example 1 was weighed according to the weight fractions of the components in the following table 1, and the machine-made sand powder content in the comparative example 1 was 10% without adding a defoaming component. The test was performed according to the performance test method, the expansion rate test results are shown in Table 10, the compressive strength test results are shown in Table 11, the interfacial adhesion performance test results are shown in Table 12, the electric flux test results are shown in Table 13, and the permeation resistance test results are shown in Table 14.
TABLE 1
The preparation method of the magnesium phosphate repair mortar specifically comprises the following steps:
1. mixing all solid components such as ammonium dihydrogen phosphate, magnesium oxide, machine-made sand, admixture (fly ash), retarding component and the like which are weighed in table 1, pouring into a rubber sand stirrer, stirring slowly for 1min, and uniformly mixing;
2. adding the weighed water into the uniformly mixed solid components, and slowly mixing for 30s by using a rubber sand mixer, and then rapidly mixing for 1min until uniformly mixing;
3. and pouring and molding the magnesite phosphate mortar mixture, and performing a related performance detection test.
Comparative example 2
The magnesium phosphate mortar in this comparative example was weighed according to the weight fractions of the components in table 2, and the machine-made sand-stone powder content in comparative example 2 was 20% without adding an antifoaming component. The test was performed according to the performance test method, the expansion rate test results are shown in Table 10, the compressive strength test results are shown in Table 11, the interfacial adhesion performance test results are shown in Table 12, the electric flux test results are shown in Table 13, and the permeation resistance test results are shown in Table 14.
TABLE 2
The preparation method of the magnesium phosphate repair mortar specifically comprises the following steps:
1. mixing all solid components of ammonium dihydrogen phosphate, magnesium oxide, machine-made sand, admixture (fly ash), retarding component and the like which are weighed in table 2, pouring into a rubber sand stirrer, stirring slowly for 1min, and uniformly mixing;
2. adding the weighed water into the uniformly mixed solid components, and slowly mixing for 30s by using a rubber sand mixer, and then rapidly mixing for 1min until uniformly mixing;
3. and pouring and molding the magnesite phosphate mortar mixture, and performing a related performance detection test.
Comparative example 3
The magnesium phosphate mortar in this comparative example was weighed according to the weight fractions of the components in Table 3, and only a single defoaming component A was blended in comparative example 3. The test was performed according to the performance test method, the expansion rate test results are shown in Table 10, the compressive strength test results are shown in Table 11, the interfacial adhesion performance test results are shown in Table 12, the electric flux test results are shown in Table 13, and the permeation resistance test results are shown in Table 14.
TABLE 3 Table 3
The preparation method of the magnesium phosphate repair mortar specifically comprises the following steps:
1. mixing all solid components such as weighed monoammonium phosphate, magnesium oxide, machine-made sand, admixture, retarding component and the like, pouring into a rubber sand mixer, slowly stirring for 1min, and uniformly mixing;
2. mixing the weighed liquid components such as water, the defoaming component A and the like in advance, adding the mixture into the uniformly mixed solid components, and mixing the mixture for 30 seconds at a slow speed by a rubber sand mixer, and then mixing the mixture for 1min at a fast speed until the mixture is uniformly mixed;
3. and pouring and molding the magnesite phosphate mortar mixture, and performing a related performance detection test.
Comparative example 4
The magnesium phosphate mortar in this comparative example was weighed according to the weight fractions of the components in table 4, and silica fume (active SiO 2) was used as defoaming component C in comparative example 4 in combination with defoaming component a. The test was performed according to the performance test method, the expansion rate test results are shown in Table 10, the compressive strength test results are shown in Table 11, the interfacial adhesion performance test results are shown in Table 12, the electric flux test results are shown in Table 13, and the permeation resistance test results are shown in Table 14.
TABLE 4 Table 4
The preparation method of the magnesium phosphate repair mortar specifically comprises the following steps:
1. mixing all solid components such as ammonium dihydrogen phosphate, magnesium oxide, machine-made sand, admixture, retarding component, defoaming component C and the like, pouring into a rubber sand mixer, slowly stirring for 1min, and uniformly mixing.
2. Mixing the weighed liquid components such as water, the defoaming component A and the like in advance, pouring the mixture into the uniformly mixed solid components, and mixing the mixture for 30 seconds by a rubber sand mixer at a low speed and then mixing the mixture for 1min quickly until the mixture is uniformly mixed.
3. And pouring and molding the magnesium phosphate mortar mixture, and performing related performance tests.
Comparative example 5
The magnesium phosphate mortar in comparative example 5 was weighed according to the weight fractions of the components in the following Table 5, and the machine-made sand powder content in comparative example 5 was 0%, without adding an antifoaming component. The test was performed according to the performance test method, the expansion rate test results are shown in Table 10, the compressive strength test results are shown in Table 11, the interfacial adhesion performance test results are shown in Table 12, the electric flux test results are shown in Table 13, and the permeation resistance test results are shown in Table 14.
TABLE 5
The preparation method of the magnesium phosphate repair mortar specifically comprises the following steps:
1. mixing all solid components of ammonium dihydrogen phosphate, magnesium oxide, machine-made sand, admixture (fly ash), retarding component and the like which are weighed in table 5, pouring into a rubber sand stirrer, stirring slowly for 1min, and uniformly mixing;
2. adding the weighed water into the uniformly mixed solid components, and slowly mixing for 30s by using a rubber sand mixer, and then rapidly mixing for 1min until uniformly mixing;
3. and pouring and molding the magnesite phosphate mortar mixture, and performing a related performance detection test.
Example 1
For the magnesium phosphate repair mortar based on monoammonium phosphate and limestone machine-made sand and the preparation method thereof, the two groups of magnesium phosphate mortar in the embodiment 1 are weighed according to the parts by weight in the table 6, and the machine-made sand and stone powder content in the embodiment is 0%. In this example, the defoaming component A, B was compounded, and the test was conducted according to the performance test method, the expansion ratio test results are shown in Table 10, the compressive strength test results are shown in Table 11, the interfacial adhesion test results are shown in Table 12, the electric flux test results are shown in Table 13, and the permeation resistance test results are shown in Table 14.
Example 2
The two groups of magnesium phosphate mortars in the embodiment 2 are weighed according to the parts by weight in the table 7, and the content of the machine-made sand stone powder in the embodiment is 10%. In this example, the defoaming component A, B was compounded, and the test was conducted according to the performance test method, the expansion ratio test results are shown in Table 10, the compressive strength test results are shown in Table 11, the interfacial adhesion test results are shown in Table 12, the electric flux test results are shown in Table 13, and the permeation resistance test results are shown in Table 14.
Table 7 the preparation method of the magnesium phosphate repair mortar in this example is the same as that of example 1, and will not be repeated here.
Example 3
The two groups of magnesium phosphate mortar in the embodiment 3 are weighed according to the weight parts of table 8 for the magnesium phosphate repair mortar based on monoammonium phosphate and limestone machine-made sand and the preparation method thereof. The stone dust content of the machine-made sand in this example was 15%. In this example, the defoaming component A, B was compounded, and the test was conducted according to the performance test method, the expansion ratio test results are shown in Table 10, the compressive strength test results are shown in Table 11, the interfacial adhesion strength test results are shown in Table 12, the electric flux test results are shown in Table 13, and the permeation resistance test results are shown in Table 14.
TABLE 8
The preparation method of the magnesium phosphate repair mortar in this embodiment is the same as that of embodiment 1, and will not be described here again.
Example 4
The two groups of magnesium phosphate mortars in the embodiment 4 are weighed according to the weight parts of table 9 for the magnesium phosphate repair mortar based on the monoammonium phosphate and the limestone machine-made sand and the preparation method thereof. Unlike example 1, the stone dust content of the machine-made sand in this example was 20%. In this example, the defoaming component A, B was compounded, and the test was conducted according to the performance test method, the expansion ratio test results are shown in Table 10, the compressive strength test results are shown in Table 11, the interfacial adhesion test results are shown in Table 12, the electric flux test results are shown in Table 13, and the permeation resistance test results are shown in Table 14.
TABLE 9
The preparation method of the magnesium phosphate repair mortar in this embodiment is the same as that of embodiment 1, and will not be described here again.
Test examples for Performance detection
The stirred mortar mixture is tested for final expansion rate of magnesium phosphate mortar according to the test method of free bleeding rate and free expansion rate of T0518-2020 cement paste in JTG 3420-2020 of highway engineering cement and cement concrete test procedure, the mortar strength test is carried out according to the molding of GB/T17671-1999 of cement mortar strength test method (ISO method), the interface bonding strength test is carried out according to the molding of JC/T2537-2019 of magnesium phosphate repair mortar and curing to 3d and 28d as required, the impermeability test is carried out according to the molding of JGJ/T70-2009 of basic performance test method standard of building mortar and curing to 28d as required, and the electric flux test is carried out according to the molding of GB/T50082-2009 of ordinary concrete long-term performance and durability test method standard as required.
Performance test results
TABLE 10 final expansion ratio
Table 11 compressive strength
/>
Table 12 interfacial bond strength
TABLE 13 electric flux
TABLE 14 permeation resistance pressure
The results of the performance test of comparative examples 1, 2 and 5 show that the stone powder in the machine-made sand can cause the magnesite phosphate mortar to obviously expand, and simultaneously cause other properties including compressive strength, interfacial bonding strength and permeation resistance (including chloride ion permeation resistance and water permeation resistance) to be obviously reduced, wherein: the compressive strength is reduced by more than 28.4%, the interfacial bonding strength is reduced by 56.9%, the electric flux is increased (the chlorine ion permeation resistance is reduced) by more than 55%, and the impermeability pressure is reduced by more than 30%. In order to solve the problems of expansion and corresponding performance reduction caused by stone powder, the invention provides a method for preparing magnesium phosphate machine-made sand mortar by using a compound defoaming component.
The comparison of the performance detection test results of examples 2, 3 and 4 with comparative examples 1 and 2 shows that the magnesium phosphate repair mortar is successfully prepared based on monoammonium phosphate and machine-made sand, and the expansion rate of the mortar is reduced from more than 7% to within 1% by using the compounded defoaming component (A+B), so that the compounded defoaming component has remarkable inhibition effect on the expansion of the machine-made sand with the stone powder content ranging from 0% to 20%. The test results also show that the compound defoaming component obviously inhibits the expansion of mortar, has obvious improvement effect on the strength and durability of repair mortar, can improve the compressive strength of 1h and 28d by more than 30%, improve the bonding strength of 3d and 28d interfaces by more than 60%, reduce the electric flux by more than 70%, improve the impervious pressure by more than 75%, and can meet the requirements of most repair projects. In addition, the comparison of the performance detection test results of the comparative example 5 and the example 1 shows that the compound defoaming component provided by the invention also has a further performance improvement effect on the magnesium phosphate mortar prepared by using the machine-made sand with the stone powder content of 0%. Since even in the case of using machine-made sand with 0% stone powder, since the raw materials of monoammonium phosphate and magnesium oxide are accompanied by a small amount of ammonia gas (NH 3) during the reaction, slight expansion is caused, thereby causing a somewhat adverse effect on the properties. The compound defoaming component provided by the invention can also effectively eliminate the expansion generated by the reaction, further reduce the expansion rate from 1.2% to 0.4%, and further improve the strength and the durability, and is specifically expressed as follows: the compressive strength of 1h and 28d is respectively improved by 26.8 percent and 16.8 percent, the interfacial bonding strength of 3d and 28d is respectively improved by 57.1 percent and 41.2 percent, the electric flux is reduced by 46.4 percent, and the impervious pressure is improved by 50 percent. As a result of comparison between the performance test results of example 1 and comparative example 3-1, it was revealed that the effect of suppressing the expansion ratio by the single blending of the antifoaming component A was inferior to that by the combination of the antifoaming component (A+B), and the expansion ratio was reduced from only 7% or more to 4 to 5%. In addition, the single defoaming component A improves the compressive strength and durability of the magnesium phosphate mortar prepared from the machine-made sand, which is not better than that of the composite defoaming component (A+B). The liquid defoaming component A mainly plays a role in physical defoaming, adopts polyether modified organic silicon defoamer, and performs a defoaming function after bubbles are generated. However, since the generation of bubbles is caused by the continuous reaction between the stone powder and ammonium dihydrogen phosphate, the elimination of the generated bubbles by the liquid defoaming component a alone does not achieve the optimum defoaming effect, and it is also necessary to suppress the generation of bubbles starting from the reaction causing the generation of bubbles. The solid defoaming component B is calcium silicate (main components of tricalcium aluminate, tricalcium silicate and dicalcium silicate), which is strong alkaline in aqueous solution, the pH value can reach 12-13, the calcium carbonate (stone powder main component) is weak alkaline in aqueous solution, the pH value is about 9-9.5, the solid defoaming component B with stronger alkalinity can preferentially react with acidic substance monoammonium phosphate, and the reaction does not generate a large amount of foaming, thereby playing a role in effectively inhibiting foaming. Therefore, the remarkable effect of eliminating bubbles and reducing expansion is achieved by combining the defoaming effect of the defoaming component A and the foam inhibition effect of the defoaming component B. The comparison results of comparative examples 3-1, 3-2, 3-3 and 3-4 also show that increasing the amount of the antifoaming component A in the case of single blending does not further improve the effect of suppressing expansion and improving strength and durability, and that the optimum blending amount (0.3 parts by weight) of the antifoaming component A is also determined.
As shown by comparison of the performance test results of comparative examples 1 and 4, the use of single silica fume (active SiO 2) as the solid defoaming component C is compounded with the liquid defoaming component A, the effect of inhibiting expansion is inferior to that of the solid defoaming component B of calcium silicate compounded with the liquid defoaming component A, the expansion rate is reduced from more than 7% to 4.28%, and the expansion inhibiting effect of the compound silica fume on the defoaming component A is not further promoted. As a solid defoaming component, the silica fume defoaming component C is nearly neutral in aqueous solution compared with the calcium silicate defoaming component B, has pH of 7-8, has alkalinity far lower than that of the defoaming component B which is in strong alkalinity, and even lower than that of calcium carbonate (stone powder main component), and cannot react with monoammonium phosphate quickly, so that the defoaming effect is not as good as that of the defoaming component B. In addition, silica fume has extremely fine particle size and high specific surface area, and its incorporation significantly reduces fluidity of the mixture, and is also disadvantageous in eliminating bubbles.
In summary, the present invention has the following advantages in the specific embodiments: the invention adopts ammonium dihydrogen phosphate and machine-made sand with lower cost to prepare the magnesium phosphate repair mortar, thereby reducing the material cost of the magnesium phosphate mortar. If limestone machine-made sand is directly used to prepare magnesium ammonium phosphate mortar, the machine-made sand contains a large amount of stone powder (CaCO is the main component) 3 ) Can react with ammonium dihydrogen phosphate to generate carbon dioxide gas, resulting in severe foaming phenomenon and volume expansion, and further resulting in significant reduction of strength of the magnesium phosphate mortar. In order to reasonably and effectively utilize limestone machine-made sand to prepare economic and high-performance magnesium phosphate mortar, the invention adds the composite defoaming component, and simultaneously combines the organic defoaming component and the inorganic mineral material to achieve obvious defoaming effect, thereby effectively reducing expansion, improving the mechanical property and durability of the magnesium phosphate mortar prepared by machine-made sand, and successfully solving the technical problem of expansion of the magnesium phosphate mortar prepared by using monoammonium phosphate and machine-made sand.
Finally, it should be noted that the above-mentioned embodiments illustrate rather than limit the invention in any way, and that those skilled in the art will be able to utilize the above-mentioned embodiments and modifications of the invention as well as equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (6)
1. Magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand, characterized in that: comprises the following components in parts by weight: 20-30 parts of ammonium dihydrogen phosphate, 40-65 parts of magnesium oxide, 40-90 parts of machine-made sand, 20-30 parts of admixture, 2-10% of retarder component, 0.2-0.3% of defoaming component A, 1-1.5% of defoaming component B and 12-18% of cementing material; wherein, the liquid crystal display device comprises a liquid crystal display device,
the defoaming component B is a silicate product, and the main components of the defoaming component B are tricalcium aluminate, tricalcium silicate and dicalcium silicate;
the cementing material refers to the mass sum of ammonium dihydrogen phosphate, magnesium oxide and admixture;
the stone powder content in the machine-made sand is 10% -20% of the mass of the machine-made sand, the stone powder is a component with the grain size smaller than 0.075 mu m in the machine-made sand, and the main chemical component is CaCO3;
the defoaming component A is polyether modified organic silicon.
2. The magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand according to claim 1, characterized in that: the particle size of the ammonium dihydrogen phosphate is 0.2-25 mu m.
3. The magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand according to claim 1, characterized in that: the magnesia is a dead-burned magnesia, which is prepared by calcining magnesite at a high temperature exceeding 1700 ℃ and grinding, and the grain diameter is 0.2-80 mu m.
4. The magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand according to claim 1, characterized in that: the admixture is one or a mixture of more of fly ash, silica fume, slag powder and steel slag powder.
5. The magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand according to claim 1, characterized in that: the retarding component is one or a mixture of a plurality of borax, sucrose, citric acid, lactic acid, sodium tripolyphosphate, disodium hydrogen phosphate, sodium sulfate decahydrate and anhydrous sodium acetate.
6. The method for preparing magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
(1) Weighing ammonium dihydrogen phosphate, magnesium oxide, machine-made sand, admixture, retarding component, defoaming component A, defoaming component B and water according to the mass parts;
(2) Mixing all solid components of the weighed ammonium dihydrogen phosphate, magnesium oxide, machine-made sand, admixture, retarding component and defoaming component B, and stirring for 1-2 min by adopting a stirrer or a manual stirring mode to uniformly mix;
(3) Mixing the weighed water and the liquid component of the defoaming component A in advance, pouring the mixture into the uniformly mixed solid component, and continuously adopting a mortar stirrer or a manual mode to stir for 2-3 min until the mixture is uniformly stirred, thus obtaining the magnesium phosphate repair mortar;
(4) Pouring or plastering the mixed magnesium phosphate repair mortar according to the requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210129667.6A CN115650693B (en) | 2022-02-11 | 2022-02-11 | Magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210129667.6A CN115650693B (en) | 2022-02-11 | 2022-02-11 | Magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115650693A CN115650693A (en) | 2023-01-31 |
| CN115650693B true CN115650693B (en) | 2023-07-21 |
Family
ID=85024257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210129667.6A Active CN115650693B (en) | 2022-02-11 | 2022-02-11 | Magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115650693B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102283131B1 (en) * | 2020-12-09 | 2021-07-30 | 윤기현 | Eco-friendly mortar, and eco-friendly repair reinforcement construction method using the same |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2159096A5 (en) * | 1971-12-01 | 1973-06-15 | Republic Steel Corp | |
| CN101386518A (en) * | 2008-10-28 | 2009-03-18 | 汪宏涛 | High-early-strength magnesium phosphate concrete and preparation method thereof |
| CN103145396B (en) * | 2013-02-26 | 2015-04-01 | 上海建为建筑修缮工程有限公司 | Multifunctional quick repair material for cement concrete pavements and preparation method thereof |
| CN104844035B (en) * | 2015-04-01 | 2017-04-12 | 重庆大学 | Interface reinforcer preparation method and application of interface reinforcer |
| CN106966687B (en) * | 2017-04-07 | 2020-07-24 | 俞家欢 | Fluidity-free rapid-setting strong-binding-force phosphate cement repairing material and preparation method thereof |
| KR101997905B1 (en) * | 2018-06-04 | 2019-07-11 | 우백건설 주식회사 | Mortar containing fluorine resin composition and method for repairing and repairing surface of concrete structure using same |
| CN109776006A (en) * | 2019-03-15 | 2019-05-21 | 中电投工程研究检测评定中心有限公司 | A kind of magnesium phosphate cement and concrete |
| CN111943538B (en) * | 2020-07-25 | 2022-04-12 | 大同冀东水泥有限责任公司 | Method for preparing cement clinker by using high-magnesium high-soda limestone |
| CN112919872A (en) * | 2021-01-27 | 2021-06-08 | 重庆重交再生资源开发股份有限公司 | Exposed concrete repairing mortar and using method thereof |
-
2022
- 2022-02-11 CN CN202210129667.6A patent/CN115650693B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102283131B1 (en) * | 2020-12-09 | 2021-07-30 | 윤기현 | Eco-friendly mortar, and eco-friendly repair reinforcement construction method using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115650693A (en) | 2023-01-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3232777A (en) | Cementitious composition and method of preparation | |
| CN110746165A (en) | Ocean engineering repair mortar and preparation method thereof | |
| JPH06500525A (en) | Reinforced cement mixed with selected aggregates | |
| CN107651893B (en) | Radiation-proof decorative cement | |
| JP2019085304A (en) | Non-shrinkage grout composition, and non-shrinkage grout material | |
| JP2006131488A (en) | Acid resistant grout composition | |
| CN112028579A (en) | Ceramic polishing slag-based foam light soil and preparation method and application thereof | |
| JP2023543526A (en) | Ultra-low carbon clinker-free cement, its manufacturing method and use | |
| CN113213788A (en) | Composite cement with few silicate clinker components and preparation method thereof | |
| CN112537920B (en) | Nano reinforcing agent for sodium sulfate and sodium carbonate alkali-activated cementing material and preparation method and application thereof | |
| KR100971226B1 (en) | Cement mixture for chloride resistance in road pavement and repair | |
| CN111847921B (en) | Low clinker cement and preparation method and application thereof | |
| CN108439899B (en) | High-strength ultra-light cement-based composite material and preparation method thereof | |
| CN108083679B (en) | Concrete glue reducing agent and preparation method thereof | |
| KR101042817B1 (en) | Compound for concrete ionization & environmental-law carbon concrete composition containing the same | |
| JP7037879B2 (en) | Early-strength admixture for secondary products and early-strength concrete for secondary products | |
| CN107628790B (en) | Decorative cement | |
| CN113735481A (en) | Composite early strength mineral admixture and preparation method and application thereof | |
| CN112174569A (en) | Micron-sized mineral admixture for concrete | |
| CN104310812A (en) | Green ecological cement and production method thereof | |
| CN115650693B (en) | Magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand and preparation method thereof | |
| JP2003137618A (en) | Blast furnace slag fine powder containing inorganic admixture, blast furnace cement, and method of producing them | |
| CN109160762B (en) | Cement quick-hardening additive and application thereof | |
| KR20220136591A (en) | High-strength bonding materials and steam curing concrete structures equipped with them | |
| CN110615642A (en) | Concrete containing high-activity slag powder and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |