CN116161941A - Self-repairing cement-based composite material and preparation method thereof - Google Patents
Self-repairing cement-based composite material and preparation method thereof Download PDFInfo
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- CN116161941A CN116161941A CN202310065422.6A CN202310065422A CN116161941A CN 116161941 A CN116161941 A CN 116161941A CN 202310065422 A CN202310065422 A CN 202310065422A CN 116161941 A CN116161941 A CN 116161941A
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- 239000004568 cement Substances 0.000 title claims abstract description 46
- 239000002131 composite material Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 91
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 52
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 52
- 239000011707 mineral Substances 0.000 claims abstract description 52
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 40
- 239000011347 resin Substances 0.000 claims abstract description 28
- 229920005989 resin Polymers 0.000 claims abstract description 28
- 239000011449 brick Substances 0.000 claims abstract description 27
- 239000002250 absorbent Substances 0.000 claims abstract description 26
- 230000002745 absorbent Effects 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000004927 clay Substances 0.000 claims abstract description 8
- 239000002699 waste material Substances 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 15
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 13
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 13
- 239000004743 Polypropylene Substances 0.000 claims description 12
- 239000000654 additive Substances 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 12
- -1 polypropylene Polymers 0.000 claims description 12
- 229920001155 polypropylene Polymers 0.000 claims description 12
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 12
- 230000000996 additive effect Effects 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 11
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 239000004570 mortar (masonry) Substances 0.000 claims description 8
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 7
- 239000011734 sodium Substances 0.000 claims description 7
- 229910052708 sodium Inorganic materials 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000000969 carrier Substances 0.000 claims description 5
- 239000003469 silicate cement Substances 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 7
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 description 10
- 208000010392 Bone Fractures Diseases 0.000 description 7
- 206010017076 Fracture Diseases 0.000 description 7
- 230000036571 hydration Effects 0.000 description 7
- 238000006703 hydration reaction Methods 0.000 description 7
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- 239000000047 product Substances 0.000 description 6
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
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- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
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- 238000006731 degradation reaction Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- 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 self-repairing cement-based composite material and a preparation method thereof, and relates to the field of cement concrete materials, wherein the material comprises sodium silicate, super absorbent resin and self-repairing mineral particles, and the mass ratio of the sodium silicate, the super absorbent resin and the self-repairing mineral particles is 1:6:50; the process comprises self-making an integral composite material and preparing self-repairing mineral particles required in the composite material; the self-repairing cement-based composite material is prepared by adopting anhydrous silicate, super absorbent resin and self-repairing mineral particles as main raw materials, and the self-repairing mineral particles adopted at the same time are prepared by processing waste clay bricks, so that the advantages of wide cost source and low price are ensured, and meanwhile, the self-repairing performance of the composite cement-based material can be effectively improved by professional comparison.
Description
Technical Field
The invention relates to a self-repairing cement-based composite material and a preparation method thereof, belonging to the field of cement concrete materials.
Background
The concrete is used as the most widely used building material in the world, and has a series of advantages of high compressive strength, low price, strong plasticity and the like. However, due to the complex concrete composition materials and low tensile strength, cracks with different shapes and different sizes are easily generated due to factors such as external load and the like along with the change of environmental temperature and humidity in the construction and service processes. If the repairing measures are not timely taken, harmful substances from the external environment can easily permeate into the concrete through the microcracks, corrode the internal reinforcing steel bars, accelerate the degradation of the structure, reduce the bearing capacity of the structure and shorten the service life.
In recent years, the self-repairing cement-based composite material has the advantage of timely repairing and no dependence on external operation and the like compared with the conventional repairing method due to the characteristic of being capable of automatically repairing cracks of a concrete structure. The invention application with publication number of CN113024146B discloses a preparation method of a self-repairing cement-based composite material, which comprises the following raw materials in percentage by mass: siO (SiO) 2 0 to 10 weight percent of GO (graphene oxide) composite material, 20 to 50 weight percent of repair material, 5 to 15 weight percent of expanding agent, 20 to 35 weight percent of active mineral micro powder, 1 to 3 weight percent of exciting agent and 10 to 20 weight percent of deionized water; the self-repairing material is prepared from raw materials by a mixing and granulating process; the invention prepares the nano SiO by a sol-gel method 2 Particles, using nano SiO 2 As a carrier material of GO, the purpose of uniformly dispersing GO in the preparation of self-repairing materials is achieved. The self-repairing of microscopic cracks of the cement-based material is promoted by utilizing the induction effect of GO on crystallization and nucleation of hydration products of the cement-based material; in the place where the cement-based material generates microcracks, the GO can promote hydration of the self-repairing material in the cement-based material, and self-repairing products are formed at the microcracks to continuously fill the microcracks so as to achieve the purpose of repairing the microcracks.
The literature research shows that the existing cement-based material crack self-healing technology mainly comprises mineral self-healing, adhesive self-healing, shape memory alloy self-healing, microorganism self-healing and the like. The mineral self-repairing mainly comprises the steps of mixing certain mineral materials into concrete in advance, and when water permeates into the cement-based material through cracks, the mineral materials can react with hydration products chemically to generate calcium silicate gel, ettringite and other crystal precipitates of calcium carbonate to heal the cracks. Mineral self-healing mainly includes: self-healing based on mineral admixtures, self-healing based on expanding agents, self-healing based on chemical crystallization precipitation additives, and the like. The mineral material and the repair product have better compatibility with the cement matrix, and have low cost and simple and convenient operation, thus having good application prospect. However, the existing mineral self-repairing has the problems of low repairing efficiency, complex formula and high cost, so that the development of the self-repairing cement-based composite material with high repairing efficiency, simple mixing ratio and low cost has important significance.
Disclosure of Invention
In order to solve the problems existing in the prior art, the invention provides a self-repairing cement-based composite material and a preparation method thereof.
The technical scheme of the invention is as follows:
the invention provides a self-repairing cement-based composite material which comprises sodium silicate, super absorbent resin and self-repairing mineral particles, wherein the mass ratio of the sodium silicate to the super absorbent resin to the self-repairing mineral particles is 1:6:50.
Preferably, the self-repairing mineral particles take brick particles as carriers, sodium silicate as repairing materials and polyvinylpyrrolidone as a protective film.
Preferably, the self-healing mineral particles are prepared by the steps of:
firstly, grinding the waste clay bricks to particles with the particle size of 0.075-4.75 mm;
then, adding the ground particles into a sodium silicate solution with the mass concentration of 10%, dispersing by using ultrasonic waves, and then preserving for 24 hours to obtain the sodium silicate-adsorbed brick particles;
finally, immersing the brick particles adsorbed with sodium silicate in a polyvinylpyrrolidone solution with the mass concentration of 15-30%, and placing the brick particles in an incubator at 80 ℃ for 12 hours to obtain the self-repairing mineral particles.
Preferably, the sodium silicate is anhydrous sodium silicate, the molecular weight of which is 122.6, the modulus of which is 1.39, and the purity of which is >99.9%.
Preferably, the super absorbent resin has a particle size of 160-250 μm, a water absorption capacity of 450g/g and a density of 0.7g/mL.
Preferably, the self-repairing cement-based composite material further comprises a base material and an additive, wherein the base material comprises silicate cement, sand, polypropylene fiber and a water reducing agent; the additive comprises Fe 2 O 3 And MgO.
The invention also provides a preparation method of the self-repairing cement-based composite material, which comprises the following specific steps of stirring, pouring, demolding and curing:
s1, selecting silicate cement, sand, anhydrous sodium silicate, super absorbent resin, self-repairing mineral particles, polypropylene fibers and a water reducer as basic materials, weighing and preparing the raw materials, and adding the self-repairing agent, the cement and the sand into a mortar stirrer together for dry stirring for 60S;
s2, adding water, slowly adding the dispersed polypropylene fibers into a pot in the stirring process, and uniformly stirring; each group of stirring time is not less than 240s, and the workability of the mortar is adjusted by doping a water reducing agent;
s3, molding the test piece by using a mold, curing for 24 hours with the mold, and demolding;
s4, placing the test piece after demolding in a standard curing room for curing, wherein the temperature of the curing room is controlled to be 20+/-2 ℃, and RH is more than or equal to 95%.
Preferably, the method comprises the steps of, the forming die in the step 3 adopts the die with the size of 40 multiplied by 40mm 3 Or 40X 160mm 3 。
The invention has the following beneficial effects: according to the invention, anhydrous silicate, super absorbent resin and self-repairing mineral particles are used as main raw materials to prepare the self-repairing cement-based composite material, and the anhydrous silicate can react with calcium hydroxide generated by hydration in mortar to generate C-S-H gel, so that the strength recovery capability of a matrix is improved; the super absorbent resin has stronger water absorption capacity, and with the increase of curing age, ca in the test piece 2+ Slowly consume and expand highlyCa in the solution inside the water absorbent resin particles 2+ Diffusion into the fracture allows for further formation of hydration products within the fracture; the self-repairing mineral particles have the characteristics of strong water absorption capacity, porous structure and the like, the self-dissolving time of the surface protection film is controlled by the thickness of the PVP protection film, the self-repairing needs of cracks can be met, the self-repairing mineral particles adopted at the same time are prepared by processing waste clay bricks, the price is lower, and meanwhile, the self-repairing performance of the composite cement-based material can be effectively improved by professional comparison.
Drawings
FIG. 1 is a graph of surface crack healing rate versus histogram for the present invention;
FIG. 2 is a graph of compressive strength recovery versus bar graph for the present invention;
FIG. 3 is a graph of flexural strength recovery versus bar chart for the present invention;
fig. 4 is a conceptual diagram of the self-healing mineral particle reaction of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment provides a self-repairing cement-based composite material, which comprises sodium silicate, super-absorbent resin and self-repairing mineral particles, wherein the self-repairing mineral particles take brick particles as carriers, sodium silicate is a repairing material, polyvinylpyrrolidone is a protective film, the mass ratio of the sodium silicate to the super-absorbent resin to the self-repairing mineral particles is 1:6:50, and the self-repairing cement-based composite material further comprises a base material and an additive, wherein the base material comprises Portland cement, sand, polypropylene fiber and a water reducer; the additive comprises Fe 2 O 3 And MgO; the sodium silicate adopted in the invention is anhydrous sodium silicate, and the molecular weight of the sodium silicate is 122.6, modulus of 1.39, purity>99.9%; the Gao Xishui resin has the particle size of 160 mu m, the water absorption rate of 450g/g and the density of 0.7g/mL; the self-repairing mineral particles adopted are also prepared by the following steps: firstly, grinding the waste clay bricks to particles with the particle size of 0.075 mm; then, adding the ground particles into a sodium silicate solution with the mass concentration of 10%, dispersing by using ultrasonic waves, and then preserving for 24 hours to obtain the sodium silicate-adsorbed brick particles; finally, the tile particles adsorbed with sodium silicate were immersed in a polyvinylpyrrolidone solution having a mass concentration of 15%, and then placed in an incubator at 80 ℃ for 12 hours, thereby obtaining self-repairing mineral particles (as shown in fig. 4).
Example 2
The embodiment provides a self-repairing cement-based composite material, which comprises sodium silicate, super-absorbent resin and self-repairing mineral particles, wherein the self-repairing mineral particles take brick particles as carriers, sodium silicate is a repairing material, polyvinylpyrrolidone is a protective film, the mass ratio of the sodium silicate to the super-absorbent resin to the self-repairing mineral particles is 1:6:50, and the self-repairing cement-based composite material further comprises a base material and an additive, wherein the base material comprises Portland cement, sand, polypropylene fiber and a water reducer; the additive comprises Fe 2 O 3 And MgO; the sodium silicate adopted in the invention is anhydrous sodium silicate, the molecular weight of the sodium silicate is 122.6, the modulus is 1.39, and the purity is high>99.9%; the particle size of the super absorbent resin is 200 mu m, the water absorption rate is 450g/g, and the density is 0.7g/mL; the self-repairing mineral particles adopted are also prepared by the following steps: firstly, grinding waste clay bricks to particles with the particle size of 2.25 mm; then, adding the ground particles into a sodium silicate solution with the mass concentration of 10%, dispersing by using ultrasonic waves, and then preserving for 24 hours to obtain the sodium silicate-adsorbed brick particles; finally, the brick particles adsorbed with sodium silicate are immersed in a polyvinylpyrrolidone solution with the mass concentration of 20%, and then are placed in an incubator at 80 ℃ for 12 hours, so as to prepare the self-repairing mineral particles.
Example 3
The embodiment provides a self-repairing cement-based composite material, which comprises sodium silicate, super-absorbent resin and self-repairing mineral particles, wherein the self-repairing mineral particles take brick particles as carriers, the sodium silicate is a repairing material, and the polyvinylpyrrolidone is a protecting materialThe protective film comprises a base material and an additive, wherein the mass ratio of the base material to the additive is 1:6:50, and the base material comprises Portland cement, sand, polypropylene fiber and a water reducing agent; the additive comprises Fe 2 O 3 And MgO; the sodium silicate adopted in the invention is anhydrous sodium silicate, the molecular weight of the sodium silicate is 122.6, the modulus is 1.39, and the purity is high>99.9%; the particle size of the super absorbent resin is 250 mu m, the water absorption rate is 450g/g, and the density is 0.7g/mL; the self-repairing mineral particles adopted are also prepared by the following steps: firstly, grinding waste clay bricks to particles with the particle size of 4.75 mm; then, adding the ground particles into a sodium silicate solution with the mass concentration of 10%, dispersing by using ultrasonic waves, and then preserving for 24 hours to obtain the sodium silicate-adsorbed brick particles; finally, the brick particles adsorbed with sodium silicate are immersed in a polyvinylpyrrolidone solution with the mass concentration of 30%, and then are placed in an incubator at 80 ℃ for 12 hours, so as to prepare the self-repairing mineral particles.
Example 4
The embodiment provides a preparation method of a self-repairing cement-based composite material, which comprises the following steps:
stirring, pouring, demolding and curing, wherein the method comprises the following steps of:
s1, selecting silicate cement, sand, sodium silicate, super absorbent resin, self-repairing mineral particles, polypropylene fibers and a water reducer as raw materials, weighing the raw materials for preparation, and adding the self-repairing agent, the cement and the sand into a mortar stirrer together for dry stirring for 60S; the sodium silicate can react with calcium hydroxide generated by hydration in the mortar to generate C-S-H gel, so that the strength recovery capability of the matrix is improved; the super absorbent resin has stronger water absorption capacity, and with the increase of curing age, ca in the test piece 2+ Slowly consumed, expanding Ca in the solution inside the super absorbent resin particles 2+ Diffusion into the fracture allows for further formation of hydration products within the fracture; and anhydrous sodium silicate is adopted, the purity is more than 99.9%, and the water absorption rate of the used super absorbent resin is 450g/g; therefore, the composite raw material adopts anhydrous sodium silicate, self-repairing mineral particles and super absorbent resin as main materials, and comprises the following components in percentage by mass: anhydrous sodium silicate more than 0 and less than or equal to 10 percent and less than or equal to 5 percentThe mass ratio of the anhydrous sodium silicate, the super absorbent resin and the self-repairing mineral particles is 1:6:50.
Meanwhile, in order to reduce the cost, the self-repairing mineral particles are prepared by adopting a self-preparation process, and the steps are as follows: firstly grinding waste clay bricks to particles with the particle size of 0.075-4.75 mm, then adding the particles into a sodium silicate solution with the mass concentration of 10%, dispersing the particles by ultrasonic waves, and then preserving the dispersed particles for 24 hours to obtain sodium silicate-adsorbed brick particles, finally immersing the sodium silicate-adsorbed brick particles in polyvinylpyrrolidone (solution, placing the solution in an incubator at 80 ℃ for 12 hours, thereby obtaining self-repairing mineral particles with the brick particles as a carrier, the sodium silicate as a repairing material and the polyvinylpyrrolidone as a protective film;
s2, adding water into the mixed material, slowly adding the dispersed polypropylene fibers into a pot in the stirring process, and uniformly stirring; each group of stirring time is not less than 240s, and the workability of the mortar is adjusted by doping a water reducing agent;
s3, molding the test piece by using a mold, curing the test piece for 24 hours with the mold, and demolding, wherein the used mold is 40 multiplied by 40mm in size 3 Or 40X 160mm 3 Is a kind of device for the treatment of a cancer;
s4, placing the test piece after demolding in a standard curing room for curing, wherein the temperature of the curing room is controlled to be 20+/-2 ℃, and RH is more than or equal to 95%.
Example 5
The self-repairing cement-based composite material prepared in the above example 4 is compared with a cement-based composite material prepared without adding SAP, self-repairing mineral particles and sodium silicate by performance test, and specific components and contents are shown in Table 1:
TABLE 1
Firstly, taking the self-repairing cement-based composite material prepared by the step of the example 4 as an implementation group, taking the cement-based composite material prepared by adding no SAP, self-repairing mineral particles and sodium silicate as a control group, and prefabricating cracks on the surfaces of the implementation group and the control group for self-repairing evaluation;
prefabricating cracks; will be of size 40X 40mm 3 The test piece is placed on a cement mortar compression-resistant and fracture-resistant integrated machine, the test piece is applied with compression load at the speed of 2.4kN/s, and the test piece is automatically unloaded after being compressed to the limit load. The surface of the glass has dispersed cracks with different lengths, and the width is 0.1 mm-0.25 mm.
The size is 40×40×160mm 3 The test piece is arranged on a cement mortar compression-resistant and fracture-resistant integrated machine, three-point bending load is applied to the test piece at the speed of 50N/s, and the test piece is automatically unloaded after being pressed to a limit load. Because polypropylene fibers are doped, the toughness of the test piece is improved, the test piece is not broken, but a single concentrated crack appears in the middle part of the test piece, and the width of the test piece is 0.1-0.25 mm;
(1) Testing and characterization of surface fracture healing Rate
After the test piece is prefabricated into cracks, three parallel lines intersecting with one surface crack are drawn on the surface of the test piece after each prefabricated crack by using a marker. Observing and measuring the crack width at the intersection of the parallel lines and the crack by using a high definition electron digital microscope to obtain an initial crack width A 0 . After measurement, placing the test piece in a standard curing room, taking out the test piece and testing the crack width A of the marked part when the self-repairing curing age is 28d i . The surface crack healing rate of the test piece after the self-repairing maintenance for 28d is as follows:
γ＝(A 0 -A 28 )/A 0 ×100％；
as shown in FIG. 1, the comparison shows that the surface crack healing rate of the implementation group can reach 100%, while the surface crack healing rate of the control group is only 20%, and the crack healing effect of the implementation group is better.
(2) Testing and characterization of intensity recovery
The test pieces (with prefabricated cracks) reaching the repair and maintenance age were subjected to compressive and flexural strength tests.
Placing the test piece on a three-point bending test machine, pressing to a limit load, and obtaining the repairing bending strength f after the press machine is automatically unloaded healed . At the same timeThe strength test is carried out on the test piece without the prefabricated crack, the test piece is pressed to the limit load, and after the press machine is automatically unloaded, the initial strength f of the test piece without the prefabricated crack is obtained ref Immediately after that, the test piece is subjected to a three-point flexural strength test again to obtain the residual strength f of the test piece without the prefabricated crack unhealed . The intensity recovery rate is shown in the following formula:
η f ＝(f heald -f unheald )/(f ref -f unheald )×100％
when the strength of the test piece of the prefabricated crack is fully recovered, i.e. f healed And f ref And the strength recovery rate is 100% after being completely equal.
As shown in fig. 2 and 3, the compressive strength recovery rate of the implementation group can reach 86%, while the control group can only reach 50%; and the recovery rate of the flexural strength of the implementation group can reach 81%, and the recovery rate of the control group can only reach 42%.
In conclusion, the comparison test proves that the self-repairing cement-based composite material has a good repairing effect.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (8)
1. A self-healing cement-based composite, characterized by: the self-repairing mineral particle comprises sodium silicate, a super absorbent resin and self-repairing mineral particles, wherein the mass ratio of the sodium silicate to the super absorbent resin to the self-repairing mineral particles is 1:6:50.
2. A self-healing cement-based composite according to claim 1, wherein: the self-repairing mineral particles take brick particles as carriers, sodium silicate as repairing materials and polyvinylpyrrolidone as a protective film.
3. A self-healing cement-based composite according to claim 2, wherein: the self-repairing mineral particles are prepared by the following steps:
firstly, grinding the waste clay bricks to particles with the particle size of 0.075-4.75 mm;
then, adding the ground particles into a sodium silicate solution with the mass concentration of 10%, dispersing by using ultrasonic waves, and then preserving for 24 hours to obtain the sodium silicate-adsorbed brick particles;
finally, immersing the brick particles adsorbed with sodium silicate in a polyvinylpyrrolidone solution with the mass concentration of 15-30%, and placing the brick particles in an incubator at 80 ℃ for 12 hours to obtain the self-repairing mineral particles.
4. A self-healing cement-based composite according to claim 1, wherein: the sodium silicate adopts anhydrous sodium silicate, the molecular weight of the sodium silicate is 122.6, the modulus is 1.39, and the purity is more than 99.9%.
5. A self-healing cement-based composite according to claim 1, wherein: the Gao Xishui resin has a particle size of 160-250 μm, a water absorption rate of 450g/g and a density of 0.7g/mL.
6. A self-healing cement-based composite according to claim 1, wherein: the self-repairing cement-based composite material also comprises a base material and an additive, wherein the base material comprises silicate cement, sand, polypropylene fiber and a water reducing agent; the additive comprises Fe 2 O 3 And MgO.
7. A method of making a self-healing cementitious composite as set forth in claim 6, wherein: the preparation method comprises the following specific steps of stirring, pouring, demolding and curing:
s1, selecting silicate cement, sand, anhydrous sodium silicate, super absorbent resin, self-repairing mineral particles, polypropylene fibers and a water reducer as basic materials, weighing and preparing the raw materials, and adding the self-repairing agent, the cement and the sand into a mortar stirrer together for dry stirring for 60S;
s2, adding water into the mixed material, slowly adding the dispersed polypropylene fibers into a pot in the stirring process, and uniformly stirring; each group of stirring time is not less than 240s, and the workability of the mortar is adjusted by doping a water reducing agent;
s3, molding the test piece by using a mold, curing for 24 hours with the mold, and demolding;
s4, placing the test piece after demolding in a standard curing room for curing, wherein the temperature of the curing room is controlled to be 20+/-2 ℃, and RH is more than or equal to 95%.
8. The method for preparing a self-repairing cement-based composite material according to claim 7, wherein: the forming die in the step 3 adopts the dimension of 40 multiplied by 40mm 3 Or 40X 160mm 3 。
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