CN117510163B - Preparation method of quick-hardening magnesium slag-based repair mortar - Google Patents
Preparation method of quick-hardening magnesium slag-based repair mortar Download PDFInfo
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- CN117510163B CN117510163B CN202311477464.7A CN202311477464A CN117510163B CN 117510163 B CN117510163 B CN 117510163B CN 202311477464 A CN202311477464 A CN 202311477464A CN 117510163 B CN117510163 B CN 117510163B
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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 182
- 239000011777 magnesium Substances 0.000 title claims abstract description 182
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 182
- 239000002893 slag Substances 0.000 title claims abstract description 182
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 164
- 230000008439 repair process Effects 0.000 title claims abstract description 164
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims abstract description 102
- 239000004568 cement Substances 0.000 claims abstract description 47
- 238000006703 hydration reaction Methods 0.000 claims abstract description 46
- 239000000843 powder Substances 0.000 claims abstract description 37
- 239000004576 sand Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000000227 grinding Methods 0.000 claims abstract description 11
- 239000002609 medium Substances 0.000 claims abstract description 11
- 238000007873 sieving Methods 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims description 33
- 239000010440 gypsum Substances 0.000 claims description 27
- 229910052602 gypsum Inorganic materials 0.000 claims description 27
- 229920002472 Starch Polymers 0.000 claims description 25
- 239000008107 starch Substances 0.000 claims description 25
- 235000019698 starch Nutrition 0.000 claims description 25
- 229910021538 borax Inorganic materials 0.000 claims description 24
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 24
- 239000004328 sodium tetraborate Substances 0.000 claims description 24
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 230000036571 hydration Effects 0.000 abstract description 33
- 239000000463 material Substances 0.000 abstract description 9
- 239000012190 activator Substances 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000002440 industrial waste Substances 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 33
- 239000000047 product Substances 0.000 description 17
- 229910001653 ettringite Inorganic materials 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 8
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 8
- 239000000920 calcium hydroxide Substances 0.000 description 8
- 238000011056 performance test Methods 0.000 description 7
- 238000010998 test method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- 235000012241 calcium silicate Nutrition 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- -1 borax Chemical compound 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000007431 microscopic evaluation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- VLCLHFYFMCKBRP-UHFFFAOYSA-N tricalcium;diborate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]B([O-])[O-].[O-]B([O-])[O-] VLCLHFYFMCKBRP-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation method of quick-hardening magnesium slag-based repair mortar, which comprises the following steps: 1. grinding magnesium slag, sieving, and taking the undersize to obtain magnesium slag powder; 2. mixing the magnesium slag powder with sulphoaluminate cement, lithium hydroxide and medium sand, adding water, stirring, and carrying out hydration reaction to obtain the rapid hardening type magnesium slag-based repair mortar. According to the invention, magnesium slag is used as a cementing material, the hydraulic property of the magnesium slag is utilized to rapidly hydrate, the later strength of the repair mortar is improved, lithium hydroxide is used as a magnesium slag activator to accelerate the hydration of the magnesium slag, a system frame is built in combination with the hydration of sulphoaluminate cement to promote the strength development of the repair mortar, the rapid hardening type magnesium slag-based repair mortar with short setting time and high strength is prepared, meanwhile, the utilization of industrial waste magnesium slag is realized, the cost of raw materials is reduced, and the tensile bonding strength and the shrinkage rate of the repair mortar are adjusted by adjusting the content of each component in the repair mortar, so that the requirements of different repair objects are met, and the rapid hardening type magnesium slag-based repair mortar is flexible, convenient and easy to realize.
Description
Technical Field
The invention belongs to the technical field of mortar materials, and particularly relates to a preparation method of quick-hardening magnesium slag-based repair mortar.
Background
According to the definition of JC/T2381-2016 repair mortar, the repair mortar is cement mortar which is prepared from cement, mineral admixture, fine aggregate, additive and the like according to a proper proportion, and is added with water according to a certain proportion and uniformly stirred when in use, and is used for repairing structures and buildings. The common repair mortar in the current practical engineering is silicate cement-based repair mortar, polymer repair mortar and the like, wherein the silicate cement repair mortar has low cost but slow setting rate and poor bonding property, is not beneficial to urgent repair with a relatively tight construction period, and has the shrinkage cracking problem after hardening; the polymer repair mortar has the advantages of good tensile bonding performance, good durability and the like, but is high in price and limited in practical application.
The invention patent with publication number CN116444237A discloses a polymer sulfoaluminate cement repair mortar, a preparation method and application thereof, wherein mineral powder, calcium sulfosilicate and La 2O3 components are added into sulfoaluminate cement, sand, polymer rubber powder and auxiliary agent to make up the shrinkage of the polymer sulfoaluminate cement repair mortar in the later stage of hydration, prevent cracking, and the 14d tensile bonding strength is 1 MPa-2 MPa. However, the repairing mortar adopts various materials such as calcium silicate, defoamer, rubber powder and the like, has excessive components, is easily influenced by the quality of raw materials and has high manufacturing cost.
Therefore, a need exists for a rapid hardening, economical repair mortar.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of quick-hardening magnesium slag-based repair mortar aiming at the defects of the prior art. According to the method, magnesium slag is used as a cementing material, the hydraulic property of the magnesium slag is utilized to rapidly hydrate, the later strength of the repair mortar is improved, lithium hydroxide is used as a magnesium slag activator to accelerate the hydration of the magnesium slag, a system frame is built in combination with the hydration of sulphoaluminate cement to promote the strength development of the repair mortar, the rapid hardening type magnesium slag-based repair mortar with short setting time and high strength is prepared, meanwhile, the utilization of industrial waste magnesium slag is realized, and the problems of poor performance and high cost of the existing modified mortar are solved.
In order to solve the technical problems, the invention adopts the following technical scheme: the preparation method of the rapid hardening magnesium slag-based repair mortar is characterized by comprising the following steps of:
firstly, grinding magnesium slag in a mill, then sieving the ground magnesium slag with a square hole sieve with the diameter of 0.9mm, and taking undersize to obtain magnesium slag powder;
Mixing the magnesium slag powder obtained in the first step with sulphoaluminate cement, lithium hydroxide and middle sand in an environment of 5-30 ℃, adding water, and pouring the mixture into a stirrer for stirring for hydration reaction to obtain quick-hardening magnesium slag-based repair mortar; the water-cement ratio of the rapid hardening magnesium slag-based repair mortar is 0.4:1, and the glue-sand ratio is 1:2.
The water-cement ratio of the rapid hardening magnesium slag-based repair mortar refers to the ratio of the mass of water to the total mass of the dry cementing material, and the cement-sand ratio refers to the ratio of the total mass of the dry cementing material to the mass of medium sand.
The quick-hardening magnesium slag-based repair mortar adopts magnesium slag as a basic cementing material, the magnesium slag has hydraulic property and contains rich dicalcium silicate (C 2 S), hydrated calcium silicate (C-S-H) and calcium hydroxide are generated after hydration under the condition of adding water, and the later strength of the repair mortar is greatly improved; meanwhile, lithium hydroxide is used as a magnesium slag excitant, and after the lithium hydroxide with strong alkalinity is dissolved in water under the condition of adding water, OH - is ionized to enable the system to be alkaline, so that the dissolution of magnesium slag is accelerated, the hydration of the magnesium slag is promoted, and the strength of the repair mortar is assisted to be improved; the adopted sulphoaluminate cement (SAC) is rapidly hydrated to generate ettringite under the condition of adding water, and the ettringite is orderly arranged and built into a system frame, so that the strength development of the rapid hardening magnesium slag-based repair mortar is facilitated.
Meanwhile, the water-cement ratio of the quick-hardening magnesium slag-based repair mortar is controlled to be 0.4:1, so that the flow property and the mechanical property of the repair mortar are considered, and the problems that the repair mortar has high free water and high fluidity but poor mechanical property and cannot play a good repair role due to the fact that the water-cement ratio is too large and the repair mortar has low fluidity are avoided; according to the invention, the cement-sand ratio of the quick-hardening magnesium slag-based repair mortar is controlled to be 1:2, the mechanical property and the cost of the repair mortar are considered, and the problems that the cement-sand ratio is too low, the quantity of cementing materials is small, the quantity of sand is large, the gelation property of the repair mortar is strong, the manufacturing cost is high, and the mechanical property of the repair mortar is reduced when the self cement-sand ratio is too high are avoided.
The preparation method of the rapid hardening magnesium slag-based repair mortar is characterized in that the magnesium slag powder in the second step is 10-80 parts by weight, the sulphoaluminate cement is 10-50 parts by weight, and the lithium hydroxide is 2-4 parts by weight.
The preparation method of the rapid hardening magnesium slag-based repair mortar is characterized in that no more than 4 parts of sodium tetraborate, no more than 10 parts of gypsum, no more than 10 parts of starch and no more than 4 parts of fiber are added in the mixing process according to parts by weight.
According to the rapid hardening magnesium slag-based repair mortar, the sodium tetraborate, namely borax, is added, calcium borate is generated on the surface of the SAC, and is wrapped around SAC particles to form a protective film, so that the hydration process of the SAC is hindered, the coagulation time of the repair mortar is prolonged, a retarding effect is achieved, the volume expansion caused by rapid hydration reaction is reduced, the volume shrinkage of the repair mortar in the later stage is reduced, and the shrinkage rate of the repair mortar is reduced; the gypsum is added to supplement sulfate ions for SAC, so that the generation amount of the SAC hydration product, namely the ettringite, is increased, the length and the diameter of the needle-shaped ettringite are increased, the hydration product is better promoted to form an integral structure, and the strength of the repair mortar is improved; the starch is added to play a thickening effect in the repair mortar system, so that the viscosity of the repair mortar is increased, the repair mortar is better combined with the part to be repaired into a whole, and the repair effect is improved; by adding the fiber, the fiber with the same stress direction can provide strength when the repair mortar test piece is subjected to tensile force, so that the tensile strength is improved, and after the repair mortar test piece is broken, the longitudinal fiber is not pulled out of the test block or is not broken, so that the test piece is kept in a connected state, and the toughness of the repair mortar is improved, therefore, the fiber can obviously improve the tensile strength and toughness of the mortar in the repair mortar.
The preparation method of the rapid hardening magnesium slag-based repair mortar is characterized in that in the second step, 70 parts of magnesium slag powder, 15 parts of sulphoaluminate cement, 2.5 parts of lithium hydroxide, 2.5 parts of sodium tetraborate, 5.5 parts of gypsum and 4.5 parts of starch are calculated according to parts by weight.
The preparation method of the rapid hardening magnesium slag-based repair mortar is characterized in that the fiber is polyvinyl alcohol fiber, and the length is 6mm. The polyvinyl alcohol fiber has higher strength and elastic modulus, and contributes to improving the tensile strength and toughness of the repair mortar.
Compared with the prior art, the invention has the following advantages:
1. According to the repair mortar, the magnesium slag is used as a cementing material, the hydraulic property of the magnesium slag is utilized to rapidly hydrate, the later strength of the repair mortar is improved, lithium hydroxide is used as a magnesium slag activator to accelerate the hydration of the magnesium slag, and a system frame is built by combining with the hydration of sulphoaluminate cement to promote the strength development of the repair mortar, so that the rapid hardening type magnesium slag-based repair mortar with short setting time and high strength is prepared, meanwhile, the utilization of industrial waste magnesium slag is realized, the raw material cost is reduced, the resource waste is reduced, and the environment is protected.
2. The invention adopts components with few types, such as magnesium slag, sulphoaluminate cement, lithium hydroxide and the like and low price to prepare the rapid hardening and rapid hardening magnesium slag-based repair mortar with high strength, and the tensile bonding strength equivalent to the existing level is maintained on the premise of saving the cost, so that the raw material cost is further reduced.
3. The starch is added into the quick-hardening magnesium slag-based repair mortar to regulate and control the viscosity of the repair mortar, so that the integrity of the repair mortar and a to-be-repaired reconstruct building or structure is enhanced, and the repair effect is improved.
4. The fiber is added into the rapid hardening magnesium slag-based repair mortar, so that the bonding performance and toughness of the repair mortar test block are effectively improved.
5. The invention adjusts the tensile bonding strength and the shrinkage rate of the repair mortar by adjusting the content of each component in the quick-hardening magnesium slag-based repair mortar, thereby meeting the requirements of different repair objects, being flexible and convenient and being easy to realize.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is an XRD pattern of hydration product of the rapid hardening magnesium slag-based repair mortar prepared in example 1 of the present invention.
FIG. 2a is a C-S-H microscopic morphology graph of the rapid hardening magnesium slag-based repair mortar prepared in example 1 of the present invention.
FIG. 2b is a high-power microscopic morphology chart of the hydration product of the quick hardening magnesium slag-based repair mortar prepared in example 1 of the present invention.
FIG. 2c is a chart showing the microscopic morphology of the hydration product of the rapid hardening magnesium slag-based repair mortar prepared in example 1 of the present invention.
FIG. 2d is a pore structure diagram of a hydration product of the quick hardening magnesium slag-based repair mortar prepared in example 1 of the present invention.
Detailed Description
The fibers used in examples 2 to 20 of the present invention were polyvinyl alcohol fibers having a length of 6mm.
Example 1
The embodiment comprises the following steps:
firstly, grinding magnesium slag in a mill, then sieving the ground magnesium slag with a square hole sieve with the diameter of 0.9mm, and taking undersize to obtain magnesium slag powder;
Mixing the magnesium slag powder obtained in the first step with sulphoaluminate cement, lithium hydroxide, sodium tetraborate, gypsum, starch, fibers and medium sand in an environment of 5-30 ℃, adding water, and pouring the mixture into a stirrer for stirring for hydration reaction to obtain quick hardening magnesium slag-based repair mortar; the quick hardening type magnesium slag-based repair mortar comprises, by mass, 70 parts of magnesium slag powder, 15 parts of sulphoaluminate cement, 2.5 parts of lithium hydroxide, 2.5 parts of sodium tetraborate, 5.5 parts of gypsum and 4.5 parts of starch, wherein the water-cement ratio of the quick hardening type magnesium slag-based repair mortar is 0.4:1, and the glue-sand ratio is 1:2.
XRD detection and SEM microscopic analysis are carried out on the rapid hardening magnesium slag-based repair mortar prepared in the embodiment, XRD equipment is Japanese society TTRIII, the scanning voltage of the instrument is 40kV, and the glancing angle theta of X-rays is 5-90 degrees.
FIG. 1 is an XRD pattern of hydration product of the quick hardening magnesium slag-based repair mortar prepared in this example, and as can be seen from FIG. 1, the hydration product of the quick hardening magnesium slag-based repair mortar is mainly composed of C-S-H, calcium hydroxide and ettringite, and as only 15% SAC is added in the proportion, the content of ettringite in the hydration product is lower, and the content of C-S-H in the hydration product of magnesium slag is highest.
Fig. 2a is a C-S-H micro-morphology diagram of the rapid hardening magnesium slag-based repair mortar prepared in this example, and as can be seen from fig. 2a, the product C-S-H after hydration of the magnesium slag is irregularly cubic, and the C-S-H are connected to form a body, so as to provide strength for the repair mortar, and the diameter and length of the ettringite are increased under the action of gypsum.
Fig. 2b is a high-power microscopic morphology diagram of a hydration product of the quick-hardening magnesium slag-based repair mortar prepared in the embodiment, and as can be seen from fig. 2b, the ettringite generated by SAC hydration, the C-S-H and the calcium hydroxide are interwoven with each other to form a compact integral structure under the combined action of the hydration product, so that the repair mortar has higher strength, the magnesium slag generates more flaky calcium hydroxide crystals under the combined action of the lithium hydroxide and the starch, and the calcium hydroxide can be converted into the C-S-H along with the prolongation of the hydration time, so that the content of the calcium hydroxide is reduced along with the increase of the hydration age, the content of the C-S-H is increased, and the mechanical property of the mortar is increased.
Fig. 2C is a microscopic morphology diagram of the hydration product of the rapid hardening magnesium slag-based repair mortar prepared in this example, and fig. 2d is a pore structure diagram of the hydration product of the rapid hardening magnesium slag-based repair mortar prepared in this example, and as can be seen from fig. 2C and 2d, the hydration products C-S-H, calcium hydroxide and ettringite in the repair mortar are randomly arranged and are cross-lapped and connected with each other, and due to the short hydration time, pores and a large amount of calcium hydroxide exist in the overall structure, which will be improved with the prolongation of the hydration time.
Example 2
The embodiment comprises the following steps:
firstly, grinding magnesium slag in a mill, then sieving the ground magnesium slag with a square hole sieve with the diameter of 0.9mm, and taking undersize to obtain magnesium slag powder;
Mixing the magnesium slag powder obtained in the first step with sulphoaluminate cement, lithium hydroxide, sodium tetraborate, gypsum, starch, fibers and medium sand in an environment of 5-30 ℃, adding water, and pouring the mixture into a stirrer for stirring for hydration reaction to obtain quick hardening magnesium slag-based repair mortar; the quick-hardening magnesium slag-based repair mortar comprises, by mass, 52 parts of magnesium slag powder, 30 parts of sulphoaluminate cement, 1.5 parts of lithium hydroxide, 2.5 parts of sodium tetraborate, 10 parts of gypsum and 4 parts of starch, wherein the water-cement ratio of the quick-hardening magnesium slag-based repair mortar is 0.4:1, and the cement-sand ratio is 1:2.
Example 3
This embodiment differs from embodiment 2 in that: the fiber content was 2 parts.
Example 4
This embodiment differs from embodiment 2 in that: the fiber was 4 parts.
The rapid hardening magnesium slag-based repair mortar prepared in examples 2 to 4 was injected into a mold to prepare a test piece, the length of the test piece after demolding (denoted as a) was measured, then the length of the test piece at 28d (denoted as B) was measured, and shrinkage (%) = (a-B)/a×100% was calculated; meanwhile, tensile bond strength performance test was performed on the test piece according to the test method required by JC/T2381-2016 repair mortar, and the results are shown in Table 1 below.
TABLE 1
As can be seen from Table 1, the incorporation of the fibers in the rapid hardening magnesium slag-based repair mortar can reduce the volume shrinkage of the mortar 28d, better ensure the volume stability of the rapid hardening magnesium slag-based repair mortar after use and improve the repair effect; meanwhile, the fiber is doped to enhance the tensile bonding strength of the rapid hardening type magnesium slag-based repair mortar, so that the use effect of the rapid hardening type magnesium slag-based repair mortar is better ensured. Therefore, after the fiber is doped into the rapid hardening magnesium slag-based repair mortar, the shrinkage rate of the mortar 28d is reduced, the 14d tensile bonding strength of the rapid hardening magnesium slag-based repair mortar is improved, and the rapid hardening magnesium slag-based repair mortar has a forward effect, so that the tensile bonding performance and the shrinkage rate of the rapid hardening magnesium slag-based repair mortar meet the requirements of JC/T2381-2016 repair mortar.
Example 5
The embodiment comprises the following steps:
firstly, grinding magnesium slag in a mill, then sieving the ground magnesium slag with a square hole sieve with the diameter of 0.9mm, and taking undersize to obtain magnesium slag powder;
mixing the magnesium slag powder obtained in the first step with sulphoaluminate cement, lithium hydroxide, sodium tetraborate, gypsum, starch, fibers and medium sand in an environment of 5-30 ℃, adding water, and pouring the mixture into a stirrer for stirring for hydration reaction to obtain quick hardening magnesium slag-based repair mortar; the quick hardening type magnesium slag-based repair mortar comprises, by mass, 80 parts of magnesium slag powder, 10 parts of sulphoaluminate cement, 1.5 parts of lithium hydroxide, 2.5 parts of sodium tetraborate, 10 parts of gypsum, 6 parts of starch and 1.6 parts of fibers, wherein the water-cement ratio of the quick hardening type magnesium slag-based repair mortar is 0.4:1, and the cement-sand ratio is 1:2.
Example 6
This embodiment differs from embodiment 5 in that: the sulphoaluminate cement is 30 parts.
Example 7
This embodiment differs from embodiment 5 in that: 50 parts of sulphoaluminate cement.
The quick-hardening magnesium slag-based repair mortar prepared in examples 5 to 7 was injected into a mold to prepare a test piece, the length of the test piece after demolding (denoted as a) was measured, then the length of the test piece at 28d (denoted as B) was measured, and shrinkage (%) = (a-B)/a×100% was calculated; meanwhile, tensile bond strength performance test was performed on the test piece according to the test method required by JC/T2381-2016 repair mortar, and the results are shown in Table 2 below.
TABLE 2
As can be seen from Table 2, according to the rapid hardening magnesium slag-based repair mortar provided by the invention, as the SAC content is gradually increased, under the influence of gypsum, the ettringite is increased and the crystal volume is increased, so that the 28d shrinkage rate of the rapid hardening magnesium slag-based repair mortar is gradually reduced, the 14d tensile bonding strength is obviously increased, and the tensile bonding performance and the shrinkage rate both meet the JC/T2381-2016 repair mortar requirements.
Example 8
The embodiment comprises the following steps:
firstly, grinding magnesium slag in a mill, then sieving the ground magnesium slag with a square hole sieve with the diameter of 0.9mm, and taking undersize to obtain magnesium slag powder;
Mixing the magnesium slag powder obtained in the first step with sulphoaluminate cement, lithium hydroxide, sodium tetraborate, gypsum, starch, fibers and medium sand in an environment of 5-30 ℃, adding water, and pouring the mixture into a stirrer for stirring for hydration reaction to obtain quick hardening magnesium slag-based repair mortar; according to the mass portion, 45 portions of magnesium slag powder, 45 portions of sulphoaluminate cement, 1.5 portions of lithium hydroxide, 2.5 portions of sodium tetraborate, 6 portions of starch and 1.6 portions of fiber, wherein the water-cement ratio of the rapid hardening magnesium slag-based repair mortar is 0.4:1, and the glue-sand ratio is 1:2.
Example 9
This embodiment differs from embodiment 8 in that: the gypsum was 5 parts.
Example 10
This embodiment differs from embodiment 8 in that: the gypsum was 10 parts.
The quick-hardening magnesium slag-based repair mortar prepared in examples 8 to 10 was injected into a mold to prepare a test piece, the length of the test piece after demolding (denoted as a) was measured, then the length of the test piece at 28d (denoted as B) was measured, and shrinkage (%) = (a-B)/a×100% was calculated; meanwhile, tensile bond strength performance test was performed on the test piece according to the test method required by JC/T2381-2016 repair mortar, and the results are shown in Table 3 below.
TABLE 3 Table 3
As shown in Table 3, the 28d shrinkage rate of the quick-hardening magnesium slag-based repair mortar of the invention is reduced with the increase of the gypsum content, but the effect is not obvious, and the 14d tensile bonding strength of the quick-hardening magnesium slag-based repair mortar added with 10 parts of gypsum in example 10 is increased by 0.3MPa compared with that of the quick-hardening magnesium slag-based repair mortar not added with gypsum in example 10, so that the tensile bonding performance is slightly improved, and the tensile bonding performance and the shrinkage rate meet the JC/T2381-2016 repair mortar requirement.
Example 11
The embodiment comprises the following steps:
firstly, grinding magnesium slag in a mill, then sieving the ground magnesium slag with a square hole sieve with the diameter of 0.9mm, and taking undersize to obtain magnesium slag powder;
Mixing the magnesium slag powder obtained in the first step with sulphoaluminate cement, lithium hydroxide, sodium tetraborate, gypsum, starch, fibers and medium sand in an environment of 5-30 ℃, adding water, and pouring the mixture into a stirrer for stirring for hydration reaction to obtain quick hardening magnesium slag-based repair mortar; the quick hardening type magnesium slag-based repair mortar comprises, by mass, 10 parts of magnesium slag powder, 70 parts of sulphoaluminate cement, 1.5 parts of lithium hydroxide, 2.5 parts of sodium tetraborate, 12 parts of gypsum, 4 parts of starch and 1.6 parts of fibers, wherein the water-cement ratio of the quick hardening type magnesium slag-based repair mortar is 0.4:1, and the glue-sand ratio is 1:2.
Example 12
This embodiment differs from embodiment 11 in that: 40 parts of magnesium slag.
Example 13
This embodiment differs from embodiment 11 in that: 80 parts of magnesium slag.
The rapid hardening magnesium slag-based repair mortar prepared in examples 11 to 13 was injected into a mold to prepare a test piece, the length of the test piece after demolding (denoted as a) was measured, then the length of the test piece at 28d (denoted as B) was measured, and shrinkage (%) = (a-B)/a×100% was calculated; meanwhile, tensile bond strength performance test was performed on the test piece according to the test method required by JC/T2381-2016 repair mortar, and the results are shown in Table 4 below.
TABLE 4 Table 4
As can be seen from Table 4, the 28d shrinkage rate of the rapid hardening magnesium slag-based repair mortar of the invention shows a trend of reduction along with the increase of the magnesium slag content, which shows that the magnesium slag has micro-expansibility, when the magnesium slag content is more, the volume expansion counteracts the volume shrinkage caused by the dry shrinkage, meanwhile, the tensile bonding performance of the rapid hardening magnesium slag-based repair mortar is improved along with the increase of the magnesium slag content, and the tensile bonding performance and the shrinkage rate both meet the JC/T2381-2016 repair mortar requirement.
Example 14
The embodiment comprises the following steps:
firstly, grinding magnesium slag in a mill, then sieving the ground magnesium slag with a square hole sieve with the diameter of 0.9mm, and taking undersize to obtain magnesium slag powder;
Mixing the magnesium slag powder obtained in the first step with sulphoaluminate cement, lithium hydroxide, sodium tetraborate, gypsum, starch, fibers and medium sand in an environment of 5-30 ℃, adding water, and pouring the mixture into a stirrer for stirring for hydration reaction to obtain quick hardening magnesium slag-based repair mortar; according to the mass portion, the magnesium slag powder is 45 portions, the sulphoaluminate cement is 40 portions, the lithium hydroxide is 1 portion, the sodium tetraborate is 3 portions, the gypsum is 8 portions, the starch is 4 portions, the fiber is 1.6 portions, the water-cement ratio of the quick hardening magnesium slag-based repair mortar is 0.4:1, and the glue-sand ratio is 1:2.
Example 15
This embodiment differs from embodiment 14 in that: the lithium hydroxide was 2 parts.
Example 16
This embodiment differs from embodiment 14 in that: the lithium hydroxide was 4 parts.
The rapid hardening magnesium slag-based repair mortars prepared in examples 14 to 16 were injected into a mold to prepare test pieces, the length of the test pieces after demolding (denoted as a) was measured, then the length of the test pieces at 28d (denoted as B) was measured, and shrinkage (%) = (a-B)/a×100% was calculated; meanwhile, tensile bond strength performance test was performed on the test piece according to the test method required by JC/T2381-2016 repair mortar, and the results are shown in Table 5 below.
TABLE 5
As can be seen from Table 5, the 28d shrinkage rate of the rapid hardening magnesium slag-based repair mortar is reduced along with the increase of the lithium hydroxide content of the magnesium slag activator, the hydration of the magnesium slag is rapid under the action of lithium hydroxide, the volume expansion of the hydration product is reduced, the shrinkage is reduced, the forward effect on the tensile bonding strength is achieved, but the effect is not obvious, and meanwhile, the tensile bonding performance and the shrinkage rate of the rapid hardening magnesium slag-based repair mortar meet the JC/T2381-2016 repair mortar requirement.
Example 17
The embodiment comprises the following steps:
firstly, grinding magnesium slag in a mill, then sieving the ground magnesium slag with a square hole sieve with the diameter of 0.9mm, and taking undersize to obtain magnesium slag powder;
Mixing the magnesium slag powder obtained in the first step with sulphoaluminate cement, lithium hydroxide, sodium tetraborate, gypsum, starch, fibers and medium sand in an environment of 5-30 ℃, adding water, and pouring the mixture into a stirrer for stirring for hydration reaction to obtain quick hardening magnesium slag-based repair mortar; the quick-hardening magnesium slag-based repair mortar comprises, by mass, 40 parts of magnesium slag powder, 45 parts of sulphoaluminate cement, 1 part of lithium hydroxide, 10 parts of gypsum, 4 parts of starch and 1.6 parts of fibers, wherein the water-cement ratio of the quick-hardening magnesium slag-based repair mortar is 0.4:1, and the glue-sand ratio is 1:2.
Example 18
This embodiment differs from embodiment 17 in that: sodium tetraborate 2 parts.
Example 19
This embodiment differs from embodiment 17 in that: the sodium tetraborate was 4 parts.
The rapid hardening magnesium slag-based repair mortar prepared in examples 17 to 19 was injected into a mold to prepare a test piece, the length of the test piece after demolding (denoted as a) was measured, then the length of the test piece at 28d (denoted as B) was measured, and shrinkage (%) = (a-B)/a×100% was calculated; meanwhile, tensile bond strength performance test was performed on the test piece according to the test method required by JC/T2381-2016 repair mortar, and the results are shown in Table 6 below.
TABLE 6
As can be seen from Table 6, the rapid hardening magnesium slag-based repair mortar of the invention has a slow setting speed along with the increase of the sodium tetraborate content, and can reduce the volume expansion caused by rapid hydration reaction, thereby reducing the later volume shrinkage, having a reducing effect on the shrinkage rate, having no obvious influence on the tensile bonding performance, and simultaneously, the tensile bonding performance and the shrinkage rate of the rapid hardening magnesium slag-based repair mortar meet the JC/T2381-2016 repair mortar requirement.
Example 20
The embodiment comprises the following steps:
firstly, grinding magnesium slag in a mill, then sieving the ground magnesium slag with a square hole sieve with the diameter of 0.9mm, and taking undersize to obtain magnesium slag powder;
Mixing the magnesium slag powder obtained in the first step with sulphoaluminate cement, lithium hydroxide, sodium tetraborate, gypsum, starch, fibers and medium sand in an environment of 5-30 ℃, adding water, and pouring the mixture into a stirrer for stirring for hydration reaction to obtain quick hardening magnesium slag-based repair mortar; according to the mass portion, 45 portions of magnesium slag powder, 45 portions of sulphoaluminate cement, 1 portion of lithium hydroxide, 1 portion of sodium tetraborate, 8 portions of gypsum and 1.6 portions of fiber, wherein the water-cement ratio of the rapid hardening magnesium slag-based repair mortar is 0.4:1, and the glue-sand ratio is 1:2.
Example 21
This embodiment differs from embodiment 20 in that: the starch was 5 parts.
Example 22
This embodiment differs from embodiment 20 in that: 10 parts of starch.
The rapid hardening magnesium slag-based repair mortar prepared in examples 20 to 22 was injected into a mold to prepare a test piece, the length of the test piece after demolding (denoted as a) was measured, then the length of the test piece at 28d (denoted as B) was measured, and shrinkage (%) = (a-B)/a×100% was calculated; meanwhile, tensile bond strength performance test was performed on the test piece according to the test method required by JC/T2381-2016 repair mortar, and the results are shown in Table 7 below.
TABLE 7
As can be seen from Table 7, the viscosity of the repair mortar slurry is increased along with the increase of the starch content in the quick-hardening magnesium slag-based repair mortar, the overall bonding performance of the repair mortar is improved, the tensile bonding strength is improved, no obvious influence is caused on the shrinkage rate, and meanwhile, the tensile bonding performance and the shrinkage rate of the quick-hardening magnesium slag-based repair mortar meet the JC/T2381-2016 repair mortar requirement.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any simple modification, variation and equivalent variation of the above embodiments according to the technical substance of the invention still fall within the scope of the technical solution of the invention.
Claims (4)
1. The preparation method of the rapid hardening magnesium slag-based repair mortar is characterized by comprising the following steps of:
firstly, grinding magnesium slag in a mill, then sieving the ground magnesium slag with a square hole sieve with the diameter of 0.9mm, and taking undersize to obtain magnesium slag powder;
Mixing the magnesium slag powder obtained in the first step with sulphoaluminate cement, lithium hydroxide and medium sand in an environment of 5-30 ℃, adding water, and pouring the mixture into a stirrer for stirring for hydration reaction to obtain quick-hardening magnesium slag-based repair mortar; the quick-hardening magnesium slag-based repair mortar comprises, by mass, 10-80 parts of magnesium slag powder, 10-50 parts of sulphoaluminate cement and 2-4 parts of lithium hydroxide, wherein the water-cement ratio of the quick-hardening magnesium slag-based repair mortar is 0.4:1, and the glue-sand ratio is 1:2.
2. The method for preparing the quick-hardening magnesium slag-based repair mortar according to claim 1, wherein no more than 4 parts of sodium tetraborate, no more than 10 parts of gypsum, no more than 10 parts of starch and no more than 4 parts of fiber are added in the mixing process according to parts by weight.
3. The preparation method of the quick-hardening magnesium slag-based repair mortar according to claim 2, wherein in the second step, 70 parts of magnesium slag powder, 15 parts of sulphoaluminate cement, 2.5 parts of lithium hydroxide, 2.5 parts of sodium tetraborate, 5.5 parts of gypsum and 4.5 parts of starch are calculated according to parts by weight.
4. The method for preparing the rapid hardening magnesium slag based repair mortar according to claim 2, wherein the fiber is a polyvinyl alcohol fiber with a length of 6mm.
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