CN110698147A - Cement-based repairing material suitable for saline soil environment and preparation method thereof - Google Patents
Cement-based repairing material suitable for saline soil environment and preparation method thereof Download PDFInfo
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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
- C04B28/02—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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
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Abstract
The invention provides a cement-based repairing material suitable for a saline soil environment, which is prepared from the following raw materials in parts by mass: 500-680 parts of sulphoaluminate cement, 200-350 parts of ordinary portland cement, 4.5-10 parts of nano silicon dioxide, 0.25-0.51 part of dispersing agent, 1.15-1.75 parts of water reducing agent, 0.015-0.018 part of air entraining agent, 0.40-1.25 parts of retarder, 1.9-2.5 parts of defoaming agent, 800-900 parts of quartz sand and 315-360 g of water. The invention also provides a preparation method of the cement-based patching material suitable for the saline soil environment. The invention is easy to prepare, convenient to construct, good in stability at natural temperature and good in salt-resistant soil corrosion resistance; the early strength and the later strength of the repaired cement base are ensured, and the resistance of the mortar to chloride and sulfate in the saline soil environment is improved.
Description
Technical Field
The invention belongs to the technical field of cement-based material application, relates to a cement-based repairing material suitable for a saline soil environment, and further relates to a preparation method of the cement-based repairing material.
Background
In recent years, the construction of highways and airports radiates to the northwest in a large area. The northwest area is a main concentrated distribution area of the salinized soil in China, and the salinized soil contains high-concentration corrosive salts, particularly easily soluble sulfate and chloride, so that the phenomena of cracking and corrosion stripping of a cement-based protective layer caused by concrete structures such as highway tunnels, airports and the like in the northwest area are avoided, the use safety and durability of the concrete structures are seriously influenced, and if the concrete structures are not treated in time, diseases can be rapidly amplified, so that the method has great significance for repairing the concrete structures corroded by the salinized soil.
In addition, the current practical engineering lacks the research on repairing cement-based materials seriously corroded in saline soil environment and the composite system cement-based repairing materials in various corrosive ion environments.
The Chinese invention patent application CN106608721A discloses an anticorrosive mortar for a power transmission line tower foundation. Although the anti-corrosion mortar has good anti-sulfate and anti-chloride corrosion effects, the anti-corrosion mortar is coated on the surface of a cement-based pole tower foundation, and can prolong the service life of a transmission line pole tower foundation in a saline land area. But the early strength is slowly increased, the porosity is larger, and the bonding property is poorer.
The Chinese patent application CN106810161A provides a sulfate erosion resistant graphene concrete composite material and a preparation method thereof. The graphene/concrete composite material with high strength, high toughness and good sulfate erosion resistance is obtained by utilizing the ultrahigh strength and flexibility and the ultra-large specific surface area of graphene and by opening and roughening the glass fiber clusters and then grafting the graphene network. But the cost is higher, the preparation process is more complicated, and the mixed fibers are not easy to be uniformly stirred, so that the overall compactness of the test piece is influenced.
The invention discloses a mortar with good corrosion resistance prepared by Chinese patent application CN108751916A, and relates to the technical field of concrete. Through the synergistic effect of the components, the hydration heat is effectively reduced, the concrete is prevented from generating temperature cracks, and the stability of the system is improved; by adding the 8-hydroxyquinoline sulfate modified fly ash and the modified waste rubber powder in a fixed ratio, the compactness is improved, and a passage for sulfate to enter the concrete is reduced, so that the sulfate corrosion resistance of the mortar is improved. But lack experimental studies on the aggressiveness of complex ions.
The Chinese patent application CN107857543A provides a preparation method of environment-friendly mortar for preventing chlorine salt corrosion. The mortar reduces the environmental pollution of solid wastes, improves the resistance to chloride salt corrosion, and is suitable for being applied to areas with higher chloride salt content. But is difficult to be applied to the environment of the combined action erosion of a plurality of compound salts of the saline soil.
The Chinese patent application CN102765915A discloses an anti-seepage, anti-crack and anti-sulfate corrosion resin emulsion mortar. The mortar can resist various corrosion, and is mainly characterized by high bonding strength, high seepage resistance, large ultimate tensile value, high crack resistance, high durability and good corrosion resistance. However, polymer modification can prolong the setting time of the mortar and reduce the development of early strength of the mortar. On the other hand, the polymer has larger elastic modulus and thermal expansion coefficient, can age along with the passage of time, and is difficult to be applied to the rapid repair engineering after the saline soil is corroded.
A large number of existing concrete structures are eroded by saline soil environments, and the number of bases of cement needing to be repaired is far larger than the number of constructed bases. In the prior art, a concrete product repairing material which can be used in a saline soil environment does not exist, and the saline soil is repaired by common mortar after being corroded, so that the saline soil is usually stripped soon after being repaired, the problems of reinforcing steel bar corrosion, aggravation and the like are solved, and a large amount of manpower and material resources are lost.
Disclosure of Invention
The invention aims to provide a cement-based repairing material which has good salt-resistant soil corrosion resistance and is suitable for the saline soil environment for the repairing engineering in the saline soil environment in the northwest of China; the invention also provides a preparation method of the cement-based patching material suitable for the saline soil environment. The cement-based repairing material provided by the invention has certain early strength, does not have the phenomenon of reverse shrinkage in later strength, is easy to prepare, is convenient to construct and has better stability at natural temperature.
The technical scheme adopted by the invention is as follows: a cement-based repairing material suitable for a saline soil environment is prepared from the following raw materials in parts by mass: 500-680 parts of sulphoaluminate cement, 200-350 parts of ordinary portland cement, 4.5-9.0 parts of nano silicon dioxide, 0.25-0.51 part of dispersing agent, 1.15-1.75 parts of water reducing agent, 0.015-0.018 part of air entraining agent, 0.40-1.25 parts of retarder, 1.9-2.5 parts of defoaming agent, 800-900 parts of quartz sand and 315-360 parts of water.
In order to improve the workability, mechanical strength and durability of the cement-based material, the raw materials of the cement-based repairing material suitable for the saline soil environment also comprise 90-180 parts of mineral powder and 4.5-9.0 parts of nano calcium carbonate.
Further, the nano-silica has a specific surface area (BET) of 300m2A/g hydrophilic fumed nano-silica.
Further, the nano calcium carbonate has a specific surface area (BET) of>80m2Powder nano calcium carbonate per gram.
Further, the water reducing agent is a polycarboxylic acid water reducing agent.
Further, the air entraining agent is a rosin air entraining agent.
Further, the retarder is sodium gluconate or borax (Na)2B4O7·10H2O）。
Further, the dispersing agent is sodium tripolyphosphate.
Further, the defoaming agent is butyl triphosphate.
Furthermore, the sulphoaluminate cement is rapid hardening sulphoaluminate cement with the strength grade of 42.5, the Portland cement is P.O 42.5 cement, and the mineral powder is S95 grade granulated blast furnace slag powder.
Furthermore, the quartz sand is high-purity quartz sand with the grain size of 20-40 meshes.
A preparation method of a cement-based patching material suitable for a saline soil environment comprises the following steps:
firstly, dispersing the nano material according to the proportion, firstly dissolving a dispersing agent in 65wt% of water, adding the nano material and uniformly stirring, then stirring for 30min by using a high-speed shearing machine, and then ultrasonically dispersing the stirred nano material solution in an ultrasonic disperser for 45min to finally obtain uniformly dispersed nano material dispersion liquid.
Step two, uniformly stirring sulphoaluminate cement, ordinary portland cement, quartz sand and mineral powder at 300-600 rpm according to the proportion to obtain a main material mixture;
step three, adding the uniformly dispersed nano material dispersion liquid, the residual water, the water reducing agent, the air entraining agent, the retarder and the defoaming agent in the step one into the main material mixture in the step two, and stirring at 300-600 rpm for 1 minute until the mixture is uniform;
and step four, increasing the rotating speed to 1000-1500 rpm, and stirring for 2 minutes to obtain the cement-based repairing material.
And finally, pouring the cement-based repairing material to a cement-based position needing repairing for maintenance.
According to the invention, the Portland cement and the sulphoaluminate cement are compounded, and the mineral powder and the nano material are doped, so that the early strength and the later strength of the repaired cement base are ensured, and the resistance of the mortar to chloride and sulfate in a saline soil environment is improved. The method is used for cement-based repair engineering after saline soil erosion, and has the advantages of large market space and strong practicability. The invention is easy to prepare, convenient to construct, good in stability at natural temperature and good in salt-resistant soil corrosion resistance. Compared with the prior art, the invention has the following beneficial effects:
the cement-based patching material disclosed by the invention is composed of silicate cement and sulfate cement as matrixes, a large amount of ettringite can be generated in the early stage of system hydration, and the alkalinity of the system is proper, so that the ettringite can stably exist. Therefore, the binary system has the advantages of lower porosity, rapid setting and hardening, shrinkage compensation, and excellent performance of stable increase of later strength.
The fine-ground blast furnace ore powder is used as an auxiliary cementing material, and the volcanic ash effect and the physical effect of fine-ground blast furnace ore powder particles can improve the workability, the mechanical strength and the durability of the cement-based material.
On one hand, the nano-silica and the nano-calcium carbonate are used as fillers to reduce the total porosity of the cement-based material and obviously improve the microstructure of the cement-based material, so that the mechanical property of the cement-based material is obviously improved; in addition, the nano silicon dioxide is an activating agent for promoting the volcanic ash effect and is used as a C-S-H nucleation site to promote the further hydration of the cement-based material.
The addition of the dispersing agent can enable the nano-materials to be uniformly dispersed in water without coagulation and agglomeration.
By adding the air entraining agent, the cement-based repair material can generate gaps inside when in use, and the generated fine gap structure can block the communicating holes in the hardened slurry, so that the anti-permeability performance of the system is improved.
The coagulation time is properly delayed by compounding the water reducing agent and the retarder, the fluidity of the slurry is improved, and the site construction is easy.
Detailed Description
The present invention is further described in detail with reference to the following examples, which are all experimental examples and provide real performance test data.
Example 1; preparing the following components: 623.7g of sulphoaluminate cement, 267.3g of ordinary portland cement, 315g of water, 4.5g of nano silicon dioxide, 4.5g of nano calcium carbonate, 0.27g of sodium tripolyphosphate, 1.74g of polycarboxylic acid water reducing agent, 1.23g of borax, 0.018g of triterpenoid saponin air entraining agent, 2.25g of butyl triphosphate and 900g of quartz sand.
The raw materials are prepared into the cement-based repairing material suitable for the saline soil environment according to the following steps:
firstly, dissolving sodium tripolyphosphate in 65wt% of water, adding the nano material, uniformly stirring, stirring for 30min by using a high-speed shearing machine, and then ultrasonically dispersing the stirred nano material solution in an ultrasonic disperser for 45min to finally obtain uniformly dispersed nano material dispersion liquid.
Step two, uniformly stirring sulphoaluminate cement, ordinary portland cement, quartz sand and mineral powder at 300-600 rpm according to the proportion to obtain a main material mixture;
step three, adding the uniformly dispersed nano material dispersion liquid in the step one, the residual water, the polycarboxylic acid water reducing agent, the triterpenoid saponin air entraining agent, the borax and the butyl triphosphate into the main material mixture in the step two, and stirring at 500rpm for 1 minute until the mixture is uniform;
and step four, increasing the rotating speed to 1200rpm, and stirring for 2 minutes to obtain the cement-based repairing material.
The performance measurement conclusion of this example is: the compressive strength of the cement-based patching material soaked in tap water for 1d, 7d and 28d is 34MPa, 55MPa and 74MPa respectively. After 28 days, the compressive strength of the brine in the saline soil is 80MPa, 91MPa and 83MPa after 30 times, 60 times and 90 times of dry-wet circulation, and the expansion rate is 0.017%, 0.022% and 0.031%. After 90 times of dry-wet circulation in brine, the mass is increased by 1.41 percent compared with that before erosion. The free chloride ion content in the saline soil brine is respectively 0.07%, 0.15% and 0.19% after 30 times, 60 times and 90 times of dry-wet circulation. The total chloride ion content was 0.12%, 0.19% and 0.23%, respectively.
Example 2; preparing the following components: 560.7g of sulphoaluminate cement, 240.3g of ordinary portland cement, 90g of mineral powder, 315g of water, 4.5g of nano-silica, 4.5g of nano-calcium carbonate, 0.27g of sodium tripolyphosphate, 1.68g of a polycarboxylic acid water reducing agent, 1.17g of borax, 0.016g of a triterpenoid saponin air entraining agent, 2.25g of butyl triphosphate and 900g of quartz sand.
In this embodiment, the raw materials are prepared into the cement-based repair material suitable for the saline soil environment, and the raw materials stirred in the second step further include mineral powder; the rest is the same as in example 1.
The performance measurement conclusion of this example is: the compressive strengths of the cement-based patching material soaked in tap water for 1d, 7d and 28d are 32MPa, 41MPa and 60MPa respectively. After 28 days, the compressive strength of the brine in dry and wet cycles (one day cycle) of 30 times, 60 times and 90 times is 68MPa, 85MPa and 70MPa respectively, and the expansion rate is 0.008%, 0.010% and 0.013% respectively. After 90 times of dry-wet circulation in brine, the mass is increased by 1.52 percent compared with that before erosion. The free chloride ion content in the saline soil brine is respectively 0.03%, 0.12% and 0.14% after 30 times, 60 times and 90 times of dry-wet circulation. The total chloride ion content was 0.09%, 0.14% and 0.17%, respectively.
Example 3; preparing the following components: 497.7g of sulphoaluminate cement, 213.3g of ordinary portland cement, 180g of mineral powder, 315g of water, 6.5g of nano-silica, 4.5g of nano-calcium carbonate, 0.33g of sodium tripolyphosphate, 1.68g of polycarboxylic acid water reducing agent, 1.17g of borax, 0.015g of triterpenoid saponin air entraining agent, 2.25g of butyl triphosphate and 900g of quartz sand.
In this example, the method for preparing the raw materials into the cement-based patching material suitable for the saline soil environment is the same as that of example 2.
The performance measurement conclusion of this example is: the compressive strength of the cement-based patching material after being soaked in tap water for 1d, 7d and 28d is 27MPa, 36MPa and 63MPa respectively. After 28 days, the compressive strength of the brine in dry-wet circulation for 30 times, 60 times and 90 times is 73MPa, 95MPa and 75MPa respectively, and the expansion rate is 0.014%, 0.019% and 0.025% respectively. After 90 times of dry-wet circulation in brine, the mass is increased by 0.89% compared with that before erosion. The free chloride ion content in the saline soil brine is respectively 0.08%, 0.15% and 0.17% after 30 times, 60 times and 90 times of dry-wet circulation. The total chloride ion content was 0.10%, 0.17% and 0.20%, respectively.
Example 4; preparing the following components: 668.25g of sulphoaluminate cement, 222.75g of ordinary portland cement, 90g of mineral powder, 315g of water, 9g of nano silicon dioxide, 0.27g of sodium tripolyphosphate, 1.68g of polycarboxylic acid water reducing agent, 1.17g of borax, 0.018g of triterpenoid saponin air entraining agent, 2.25g of butyl triphosphate and 850g of quartz sand.
In this example, the method for preparing the cement-based patching material suitable for the saline soil environment from the raw materials is the same as that of example 1 except that in the step one, the dispersed nano material is nano silicon dioxide.
The performance measurement conclusion of this example is: the compressive strength of the cement-based patching material after being soaked in tap water for 1d, 7d and 28d is 40MPa, 55MPa and 80MPa respectively. After 28 days, the compressive strength of the brine after 30 times, 60 times and 90 times of dry-wet circulation is 83MPa, 101MPa and 85MPa respectively, and the expansion rate is 0.008%, 0.012% and 0.013% respectively. After 90 times of dry-wet circulation in brine, the mass is increased by 0.91 percent compared with that before erosion. The free chloride ion content in the saline soil brine is respectively 0.04%, 0.11% and 0.14% after 30 times, 60 times and 90 times of dry-wet circulation. The total chloride ion content was 0.11%, 0.13% and 0.15%, respectively.
Example 5; preparing the following components: 579.15g of sulphoaluminate cement, 311.9g of ordinary portland cement, 315g g g of water, 8g of nano silicon dioxide, 0.25g of sodium tripolyphosphate, 1.53g of polycarboxylic acid water reducing agent, 0.45g of sodium gluconate, 0.018g of triterpenoid saponin air entraining agent, 2.25g of butyl triphosphate and 900g of quartz sand.
In this embodiment, in the first step, the dispersed nano material is nano silicon dioxide; in the third step, the retarder is added to be sodium gluconate; the rest is the same as in example 1.
The performance measurement conclusion of this example is: the compressive strengths of the cement-based patching material soaked in tap water for 1d, 7d and 28d are 48MPa, 53MPa and 75MPa respectively. After 28 days, the compressive strength of the brine in dry-wet circulation for 30 times, 60 times and 90 times is 82MPa, 102MPa and 79MPa respectively, and the expansion rate is 0.011%, 0.015% and 0.018% respectively. After 90 times of dry-wet circulation in brine, the mass is increased by 1.32 percent compared with that before erosion. The free chloride ion content in the saline soil brine is respectively 0.05 percent, 0.12 percent and 0.16 percent after 30 times, 60 times and 90 times of dry-wet circulation. The total chloride ion content was 0.11%, 0.15% and 0.21%, respectively.
Example 6; preparing the following components: 520.7g of sulphoaluminate cement, 280.4g of ordinary portland cement, 90g of mineral powder, 320g of water, 4.5g of nano-silica, 7.0g of nano-calcium carbonate, 0.35g of sodium tripolyphosphate, 1.35g of polycarboxylic acid water reducing agent, 1.15g of borax, 0.016g of triterpenoid saponin air entraining agent, 2.25g of butyl triphosphate and 800g of quartz sand.
In this example, the method for preparing the raw materials into the cement-based patching material suitable for the saline soil environment is the same as that of example 2.
The performance measurement conclusion of this example is: the compressive strength of the cement-based patching material soaked in tap water for 1d, 7d and 28d is 27MPa, 37MPa and 63MPa respectively. After 28 days, the compressive strength of the brine is 68MPa, 83MPa and 64MPa after 30 times, 60 times and 90 times of dry-wet circulation, and the expansion rates are 0.019%, 0.025% and 0.032%. After 90 times of dry-wet circulation in brine, the mass is increased by 1.63 percent compared with that before erosion. The free chloride ion content in the saline soil brine is respectively 0.08%, 0.17% and 0.20% after 30 times, 60 times and 90 times of dry-wet circulation. The total chloride ion content was 0.12%, 0.19% and 0.25%, respectively.
Example 7; preparing the following components: 462.2g of sulphoaluminate cement, 248.9g of ordinary portland cement, 180g of mineral powder, 330g of water, 4.5g of nano silicon dioxide, 4.5g of nano calcium carbonate, 0.27g of sodium tripolyphosphate, 1.35g of polycarboxylic acid water reducing agent, 1.15g of borax, 0.015g of triterpenoid saponin air entraining agent, 2.25g of butyl triphosphate and 800g of quartz sand.
In this example, the method for preparing the raw materials into the cement-based patching material suitable for the saline soil environment is the same as that of example 2.
The performance measurement conclusion of this example is: the compressive strength of the cement-based patching material soaked in tap water for 1d, 7d and 28d is 23MPa, 34MPa and 59MPa respectively. After 28 days, the compressive strength of the brine is 66MPa, 85MPa and 60MPa after 30 times, 60 times and 90 times of dry-wet circulation, and the expansion rate is 0.015%, 0.019% and 0.025%. After 90 times of dry-wet circulation in brine, the mass is increased by 1.51 percent compared with that before erosion. The free chloride ion content in the saline soil brine is respectively 0.09%, 0.18% and 0.19% after 30 times, 60 times and 90 times of dry-wet circulation. The total chloride ion content was 0.14%, 0.22% and 0.26%, respectively.
Example 8; preparing the following components: 514.8g of sulphoaluminate cement, 277.2g of ordinary portland cement, 90g of mineral powder, 360g of water, 9g of nano silicon dioxide, 8g of nano calcium carbonate, 0.51g of sodium tripolyphosphate, 1.15g of polycarboxylic acid water reducing agent, 0.95g of borax, 0.018g of triterpenoid saponin air entraining agent, 1.95g of butyl triphosphate and 900g of quartz sand.
In this example, the method for preparing the raw materials into the cement-based patching material suitable for the saline soil environment is the same as that of example 2.
The performance measurement conclusion of this example is: the compressive strength of the cement-based patching material soaked in tap water for 1d, 7d and 28d is 43MPa, 65MPa and 70MPa respectively. After 28 days, the compressive strength of the brine after 30 times, 60 times and 90 times of dry-wet circulation in the brine is 75MPa, 86MPa and 77MPa respectively, and the expansion rates are 0.013%, 0.017% and 0.021% respectively. After 90 times of dry-wet circulation in brine, the mass is increased by 1.23 percent compared with that before erosion. The free chloride ion content in the saline soil brine is respectively 0.06%, 0.14% and 0.17% after 30 times, 60 times and 90 times of dry-wet circulation. The total chloride ion content was 0.10%, 0.15% and 0.18%, respectively.
Example 9; preparing the following components: 579.2g of sulphoaluminate cement, 311.9g of ordinary portland cement, 315g of water, 9g of nano-silicon dioxide, 0.27g of sodium tripolyphosphate, 1.35g of polycarboxylic acid water reducing agent, 1.15g of borax, 0.018g of triterpenoid saponin air entraining agent, 1.95g of butyl triphosphate and 800g of quartz sand.
In this example, the method for preparing the raw materials into the cement-based patching material suitable for the saline soil environment is the same as that of example 5.
The performance measurement conclusion of this example is: the compressive strength of the cement-based patching material soaked in tap water for 1d, 7d and 28d is 38MPa, 56MPa and 68MPa respectively. After 28 days, the compressive strength of the brine in dry and wet circulation for 30 times, 60 times and 90 times is 76MPa, 85MPa and 73MPa respectively, and the expansion rate is 0.012%, 0.018% and 0.025% respectively. After 90 times of dry-wet circulation in brine, the mass is increased by 1.23 percent compared with that before erosion. The free chloride ion content in the saline soil brine is respectively 0.07%, 0.15% and 0.17% after 30 times, 60 times and 90 times of dry-wet circulation. The total chloride ion content was 0.11%, 0.18% and 0.20%, respectively.
Claims (10)
1. The cement-based repairing material suitable for the saline soil environment is characterized by being prepared from the following raw materials in parts by mass: 500-680 parts of sulphoaluminate cement, 200-350 parts of ordinary portland cement, 4.5-9.0 parts of nano silicon dioxide, 0.25-0.51 part of dispersing agent, 1.15-1.75 parts of water reducing agent, 0.015-0.018 part of air entraining agent, 0.40-1.25 parts of retarder, 1.9-2.5 parts of defoaming agent, 800-900 parts of quartz sand and 315-360 parts of water.
2. The cement-based patching material adapted for use in a saline soil environment of claim 1, wherein: the raw materials also comprise 90-180 parts of mineral powder and 4.5-9.0 parts of nano calcium carbonate.
3. The cement-based patching material adapted for use in a saline soil environment of claim 2, wherein: the mineral powder is S95-grade granulated blast furnace slag powder; the nano calcium carbonate has a specific surface area of>80m2Powder nano calcium carbonate per gram.
4. A soil suitable for salinization as defined in claim 1, 2 or 3An environmental cement-based repair material characterized by: the nano silicon dioxide has a specific surface area of 300m2A/g hydrophilic fumed nano-silica.
5. The cement-based patching material adapted for use in a saline soil environment of claim 4, wherein: the water reducing agent is a polycarboxylic acid water reducing agent.
6. The cement-based patching material adapted for use in a saline soil environment of claim 5, wherein: the air entraining agent is a triterpenoid saponin air entraining agent; the retarder is sodium gluconate or borax (Na)2B4O7·10H2O）。
7. The cement-based patching material adapted for use in a saline soil environment of claim 6, wherein: the dispersant is sodium tripolyphosphate; the defoaming agent is butyl triphosphate.
8. The cement-based patching material adapted for use in a saline soil environment of claim 7, wherein: the sulphoaluminate cement is rapid hardening sulphoaluminate cement with the strength grade of 42.5, and the Portland cement is P.O 42.5 cement.
9. The cement-based patching material adapted for use in a saline soil environment of claim 8, wherein: the quartz sand is high-purity quartz sand with the grain size of 20-40 meshes.
10. A preparation method of a cement-based patching material suitable for a saline soil environment is characterized by comprising the following steps:
firstly, dispersing the nano material according to the proportion, firstly dissolving a dispersing agent in 65wt% of water, adding the nano material and uniformly stirring, then stirring for 30min by using a high-speed shearing machine, and then ultrasonically dispersing the stirred nano material solution in an ultrasonic disperser for 45min to finally obtain uniformly dispersed nano material dispersion liquid;
step two, uniformly stirring sulphoaluminate cement, ordinary portland cement, quartz sand and mineral powder at 300-600 rpm according to the proportion to obtain a main material mixture;
step three, adding the uniformly dispersed nano material dispersion liquid, the residual water, the water reducing agent, the air entraining agent, the retarder and the defoaming agent in the step one into the main material mixture in the step two, and stirring at 300-600 rpm for 1 minute until the mixture is uniform;
step four, increasing the rotating speed to 1000-1500 rpm, and stirring for 2 minutes to obtain the cement-based repairing material;
and finally, pouring the cement-based repairing material to a cement-based position needing repairing for maintenance.
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Cited By (2)
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