Self-repairing and rapid-repairing cement-based mortar and preparation method thereof

Abstract

The invention discloses self-repairing and rapid-repairing cement-based mortar and a preparation method thereof, and belongs to the technical field of building materials. The self-repairing and rapid-repairing cement-based mortar is prepared from the following raw materials: 5500-6500 parts of a composite cementing material; 200 to 650 parts of an inorganic permeable crystalline material; 1500 to 3500 parts of a filling material; 307 to 510 parts of a rapid hardening component; 2-5 parts of a moisturizing and thickening component; 150 to 250 parts of a toughening and softening component; and 6-10 parts of a water reducing agent. The preparation method of the self-repairing and rapid-repairing cement-based mortar comprises the following steps: preparing the raw materials according to the proportion, uniformly mixing, adding the mixing water, and uniformly mixing to obtain the self-repairing and rapid-repairing cement-based mortar. The self-repairing quick-repairing cement-based mortar is efficient in water resistance and leaking stoppage, quick in setting and hardening and high in hour strength and has the function of silt; and a good self-repairing capability is achieved for microcosmic cracks of 0.1 mm.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building materials, and particularly relates to a self-repairing rapid repair cement-based mortar and a preparation method thereof. BACKGROUND

[0002] In the field of municipal engineering, infrastructure such as roads, bridges and tunnels is subjected to traffic loads and environmental erosion (such as rain and temperature changes) for a long time, and is prone to surface damage and cracks. If not repaired in time, the disease will quickly spread, affecting the safety of the structure and the efficiency of traffic. In view of the public nature of municipal infrastructure, the repair work usually needs to follow the "golden 30 minutes" repair window principle: the repair material is required to initial set and form a certain bearing capacity in a short time to quickly restore traffic and reduce the risk of congestion and the cost of social travel. However, the current mainstream traditional repair material (such as conventional cement-based mortar) cannot meet this time efficiency requirement: its initial setting time is generally more than 30 minutes, and the final setting time is several hours, so the traffic needs to be closed for a long time after repair, which is easy to cause regional congestion; at the same time, the shrinkage rate of conventional mortar is as high as 0.1%~0.3%, and cracks are easily generated at the interface between the hardened mortar and the substrate due to shrinkage stress, resulting in secondary damage to the repaired part, which not only needs to be repeatedly constructed, but also significantly increases the long-term maintenance cost of municipal engineering. In the context of home building, wall and floor cracking, hollowing of ceramic tiles, and water seepage in kitchens and bathrooms are common problems. Such defects not only affect the indoor aesthetics, but also may cause wall moisture return and ceramic tile falling, which directly reduces the living experience. In the existing home repair scheme, traditional mortar is still a commonly used material, but this type of material has the defect of a too long curing period: it takes more than 24 hours to fully cure, and the construction area needs to be closed during the curing period, which prohibits personnel activities or use, seriously interfering with the normal life of residents. To meet the demand for rapid repair, conventional leak stoppers have appeared on the market, which can achieve leak stopping and initial curing in a short time, but the operation is complex and cannot respond to dynamic crack propagation, and there is a serious problem of late strength reduction. In addition, whether it is municipal engineering or home building, the repair object is mostly a cement-based structure, and the damage of such structure is essentially closely related to stress action. The existing repair material can only achieve passive filling and repair, and cannot provide secondary damage protection to the repaired cement-based structure: if the structure is subjected to stress action again after repair and microcracks are generated, the material cannot actively repair the microcracks, leading to continuous expansion of the microcracks and eventually causing secondary damage, which shortens the overall effective service life of the cement-based structure and cannot fundamentally solve the problem of the cycle of "repair-damage-repair" of the cement-based structure. Therefore, it has become a technical problem to be solved by those skilled in the art to provide a repair material with fast setting time, high short-term strength and self-repairing function. SUMMARY

[0003] The present application aims at providing a self-repairing quick repairing cement-based mortar to solve the problems of strength loss and waterproof function failure caused by cracking of cement concrete structure in municipal engineering and living environment, and the cement-based mortar has high waterproof and leak-stopping efficiency, rapid setting and hardening, high short-term strength and good self-repairing ability for micro cracks of <0.1 mm.

[0004] The second object of the present application is to provide a preparation method of the cement-based mortar.

[0005] The third object of the present application is to provide an application of the cement-based mortar.

[0006] To achieve the above objects, the technical scheme adopted by the present application is as follows: The present application discloses a self-repairing quick repairing cement-based mortar, which is made of the following raw materials by weight: composite cementitious material 5500-6500 parts; inorganic permeable crystalline material 200-650 parts; filling material 1500-3500 parts; quick-setting component 307-510 parts; moisture-retaining and thickening component 2-5 parts; toughening and softening component 150-250 parts; water reducing agent 6-10 parts.

[0007] All the raw materials of the present application are in powder form.

[0008] In some embodiments of the present application, the composite cementitious material is a mixture of 1100-1300 parts of PO42.5R ordinary portland cement and 4400-5200 parts of fast-hardening sulphoaluminate cement by weight.

[0009] The composite cement mixed by ordinary portland cement and fast-hardening sulphoaluminate cement in a suitable ratio has a faster setting time and a more compact cement stone structure than single pure cement. This enhancement effect is mainly due to the synergistic effect of the hydration process of the two kinds of cement. The Ca(OH)2 precipitated by the hydration of gypsum and tricalcium silicate in ordinary portland cement can accelerate the hydration of sulphoaluminate cement. In the presence of dihydrate gypsum (CaSO4 · 2H2O), the hydration product of sulphoaluminate cement Al 2 O 3 ·3H 2 ORapid reaction with Ca(OH)2, H2O to generate ettringite (AFt), which provides strength support for the early structure. At the same time, the consumption of Ca(OH)2 further promotes the continuous hydration of tricalcium silicate in ordinary Portland cement to generate C-S-H gel and CH phase precipitation.

[0010] The large amount of needle-like AFt structure generated during the hydration of single fast-hardening sulphoaluminate cement is loose and prone to cracks; in the composite system, the C-S-H gel and CH phase generated by tricalcium silicate and dicalcium silicate in ordinary Portland cement can fill the interstitial space of the AFt framework, improve the microstructure, and make the structure of the cement stone more dense, thereby improving its mechanical properties.

[0011] In some embodiments of the present application, the inorganic osmotic crystalline material is composed of the following components in the following proportions: 16-20wt% sodium carbonate, 37-41wt% sodium silicate, 16-20wt% sodium aluminate, 16-20wt% ethylenediaminetetraacetic acid tetrasodium, 8-10% glycine.

[0012] Preferably, the inorganic osmotic crystalline material is composed of the following components in the following proportions: 17.64wt% sodium carbonate, 38.24wt% sodium silicate, 17.65wt% sodium aluminate, 17.65wt% ethylenediaminetetraacetic acid tetrasodium, 8.82wt% glycine.

[0013] Cementitious Capillary Crystalline Waterproofing Materials (CCCW) is a new type of rigid waterproofing material. After contact with water, the active chemicals contained in CCCW will react with cement hydration products to generate water-insoluble crystals, which can fill the microcracks and capillary pores of concrete, especially for cracks with a width of less than 0.3mm. These crystalline substances can improve the strength and durability of concrete, thereby prolonging its service life. Studies have shown that although CCCW can slightly reduce the fluidity of mortar, it helps to improve the mechanical properties of the overall structure of the mortar, including compressive strength, flexural strength, elastic modulus, and the strength of the coating itself and its adhesion strength with cement-based materials. In addition, CCCW also has the advantages of green environmental protection, long-lasting waterproof effect, and convenient construction.

[0014] However, the reaction of CCCW needs to rely on sufficient Ca(OH)2to provide an alkaline environment. The conventional rapid-setting leak sealing agent often uses a composite system of high-aluminate cement and fast-hardening sulphoaluminate cement, which has insufficient alkali content and is difficult to support the reaction. If ordinary Portland cement is used and the formulation of the rapid-setting agent is optimized to avoid the significant prolongation of the setting time of the slurry, the Ca(OH)2produced by the hydration of the ordinary Portland cement can be used to continuously stimulate the activity of CCCW and promote the continuous generation of crystals in the micro-cracks. At the same time, the introduction of CCCW also helps to alleviate the common "realkalization" problem of ordinary Portland cement. The Ca(OH)2produced by the hydration of ordinary Portland cement will migrate to the surface with free water and react with CO2in the air to form CaCO3, which will deposit at the interface to form "realkalization", resulting in peeling of the finish, failure of the waterproof function, and thus increasing the decoration and maintenance cost. CCCW consumes Ca(OH)2during the reaction, thereby inhibiting this phenomenon from the root.

[0015] The low-alkalinity composite cement used in the conventional cement-based waterproof leak sealing material cannot provide sufficient chemical environment for CCCW, while in the ordinary Portland cement system, CCCW can effectively use the Ca(OH)2produced by the hydration of the ordinary Portland cement to achieve good synergy. Therefore, the use of ordinary Portland cement and CCCW together can not only fully exert the advantages of both but also effectively avoid the adverse effects of each, which has significant technical and economic value.

[0016] The inorganic permeable crystalline material of the present application is suitable for ordinary Portland cement, ordinary Portland cement and sulphoaluminate cement composite. When the cement stone structure is damaged to form micro-cracks, the unhydrated cement particles covered by ettringite layers and CSH gel (providing free calcium ions) in the cement stone can react with the self-repairing components released by the osmotic pressure under the action of water permeation to form calcium carbonate on both sides of the crack, and finally fill the crack.

[0017] In some embodiments of the present application, the filling material is a mixture of 1000-2000 parts by weight of heavy calcium powder and 500-1500 parts by weight of fine sand. The fine sand has a mesh size of 70-140. In the present application, the size of the heavy calcium powder and the fine sand is reasonably matched, which can well fill the voids between the slurry, form a tight packing, improve the comprehensive performance of the repair slurry, and reduce the cost.

[0018] In some embodiments of the present application, the rapid-setting component consists of 7-10 parts by weight of lithium carbonate and 300-500 parts by weight of fast-consumption lime. Preferably, the lithium carbonate is analytical pure lithium carbonate. In the slurry system of the present application, the hydration product and strength structure component is mainly AFt, and the rate-determining step of forming AFt is the conversion of four-coordinated Al 3+ to eight-coordinated Al 3+ The lithium carbonate increases the alkalinity of the system and provides Li +To promote the polymerization of octahedron; not only to provide the required Ca(OH)2 for the generation of AFt, further improve the alkaline environment, while its exothermic effect can significantly increase the reaction temperature, thereby effectively shorten the setting time of the paste.

[0019] In some embodiments of the present application, the moisture-retention thickening component is a cellulose ether. Preferably, the cellulose ether is a hydroxypropyl methyl cellulose ether with a viscosity of 200,000 cps. The cellulose ether has good moisture-retention thickening effect, improves the cohesion of the paste, avoids the phenomenon of water seepage and water-material separation, and can keep the surface of the paste moist without cracking during hydration.

[0020] In some embodiments of the present application, the toughening and softening component comprises 100-150 parts by weight of redispersible latex powder and 50-100 parts by weight of polypropylene (PP) fiber, preferably the length of the PP fiber is ≤3 mm. The redispersible latex powder can form a network polymer film inside the cement stone, enhancing the overall stability of the cement stone structure, while improving the viscosity of the paste and the bonding strength of the hardened paste; the PP fiber effectively connects the parts of the cement stone, significantly improving the flexural strength.

[0021] In some embodiments of the present application, the water-reducing agent comprises a high-performance polycarboxylic acid water-reducing agent.

[0022] The second aspect of the present application discloses a preparation method of the self-repairing rapid repair cement-based mortar, which comprises the following steps: preparing raw materials in proportion, mixing uniformly, adding mixing water and mixing uniformly, and obtaining the product.

[0023] Preferably, 3300-5000 parts of mixing water are added and mixed uniformly.

[0024] Compared with the prior art, the present application has the following beneficial effects: The self-repairing rapid repair cement-based mortar of the present application is designed scientifically and ingeniously, is efficient in waterproofing and leakage stopping, has rapid setting and hardening, high short-term strength, and good self-repairing ability for microcracks with a size of <0.1 mm.

[0025] The present application introduces inorganic permeable crystalline material into the cement-based mortar, and when the mortar is hardened, the permeable crystalline component is contained in the cement stone structure. When the same part suffers from secondary damage and produces microcracks, the permeable crystalline component in the cement stone reacts with the immersed water to generate water-insoluble crystalline substances, repairing the microcracks and avoiding rework caused by secondary damage, thereby prolonging the service life of the structure.

[0026] The cement-based mortar of the present application mainly comprises inorganic material, is non-toxic and harmless, is environmentally friendly, and has a long service life. By using ordinary portland cement to partially replace sulphoaluminate cement, the performance is ensured while the raw material cost is effectively reduced.

[0027] The cement-based mortar of the present application realizes rapid hardening within 5 minutes and has hourly strength by compounding ordinary Portland cement with sulphoaluminate cement and adding various admixtures and additives, thereby meeting the requirement of rapid repair. Subsequently, the ordinary Portland cement continuously hydrates, thereby ensuring stable growth of later strength and realizing the same service life as the base.

[0028] The cement-based mortar of the present application only needs to be mixed with water for construction when used, and the user can adjust the water consumption to control the setting time according to the actual needs, thereby adapting to various construction scenes. The cement-based mortar still maintains good rheological property and thixotropy under high water consumption conditions, thereby ensuring full adhesion to the complex base surface. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be described clearly and completely below in combination with specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0030] A self-repairing rapid repair cement-based mortar is made of the following raw materials by weight: Composite cementitious material 5500-6500 parts; Inorganic penetrating crystalline material 200-650 parts; Filling material 1500-3500 parts; Quick-setting component 307-510 parts; Moisturizing and thickening component 2-5 parts; Toughening and softening component 150-250 parts; Water reducing agent 6-10 parts.

[0031] All the above raw materials are in powder form.

[0032] The composite cementitious material is a mixture of 1100-1300 parts of PO42.5R ordinary Portland cement and 4400-5200 parts of fast-hardening sulphoaluminate cement by weight.

[0033] The self-repairing rapid repair cement-based mortar of the present application comprises 5500-6500 parts of composite cementitious material; for example, 5500, 5600, 5700, 5800, 5900, 6000, 6100, 6200, 6300, 6400, 6500 parts.

[0034] The inorganic osmosis crystallization material is composed of the following components in the following proportions: 16-20 wt% sodium carbonate, 37-41 wt% sodium silicate, 16-20 wt% sodium aluminate, 16-20 wt% tetrasodium ethylenediaminetetraacetate, and 8-10 wt% glycine.

[0035] Preferably, the inorganic osmosis crystallization material is composed of the following components in the following proportions: 17.64 wt% sodium carbonate, 38.24 wt% sodium silicate, 17.65 wt% sodium aluminate, 17.65 wt% tetrasodium ethylenediaminetetraacetate, and 8.82 wt% glycine.

[0036] The filling material is a mixture of 1000-2000 parts by weight of heavy calcium powder and 500-1500 parts by weight of fine sand. The fine sand used in the embodiments of the present application is 70-140 mesh.

[0037] The self-repairing rapid repair cement-based mortar of the present application comprises 1000-2000 parts of filling material, for example, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000 parts.

[0038] The quick-setting component is composed of 7-10 parts by weight of lithium carbonate and 300-500 parts by weight of quick-burning lime. The lithium carbonate used in the embodiments of the present application is analytical pure lithium carbonate.

[0039] The self-repairing rapid repair cement-based mortar of the present application comprises 307-510 parts of quick-setting component; for example, 307, 308, 309, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510 parts.

[0040] The moisture-retaining thickening component is a cellulose ether. The cellulose ether used in the embodiments of the present application is a hydroxypropyl methyl cellulose ether with a viscosity of 200,000 cps.

[0041] The self-repairing rapid repair cement-based mortar of the present application comprises 2-5 parts of moisture-retaining thickening component, for example, 2, 2.5, 3, 3.5, 4, 4.5, 5 parts.

[0042] The toughening and softening component comprises 100-150 parts by weight of redispersible latex powder and 50-100 parts by weight of polypropylene (PP) fiber. The length of the PP fiber used in the embodiments of the present application is ≤3 mm.

[0043] The self-repairing rapid repair cement-based mortar of the present application comprises 150-250 parts of toughening and softening component, for example, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250 parts.

[0044] The water reducing agent of the present application is a high-performance polycarboxylic acid water reducing agent, and the dosage is 6-10 parts. For example, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10 parts.

[0045] A preparation method of the self-repairing rapid repair cement-based mortar comprises the following steps: preparing raw materials in proportion, mixing uniformly, and then adding 3300-5000 parts of mixing water and mixing uniformly.

[0046] Unless otherwise specified, the parts mentioned in the examples of the present application all refer to weight parts.

[0047] Example 1

[0048] The present embodiment discloses the composition and preparation method of the self-repairing rapid repair cement-based mortar of the present application.

[0049] The raw materials of the self-repairing rapid repair cement-based mortar of the present embodiment are as follows: Composite cementitious material 5500 parts Inorganic permeable crystalline material 250 parts Filling material 3500 parts Quick-setting component 407 parts Moisture-retaining thickening component 4 parts Toughening and softening component 150 parts High-performance polycarboxylic acid water reducing agent 7 parts Mixing water 4000 parts.

[0050] The composite cementitious material in the present embodiment is a mixture of 4400 parts of fast-hardening sulphoaluminate cement and 1100 parts of PO52.5R ordinary Portland cement.

[0051] The inorganic permeable crystalline material in the present embodiment is composed of the following components in the following proportions: 17.64wt% sodium carbonate, 38.24wt% sodium silicate, 17.65wt% sodium aluminate, 17.65wt% ethylenediaminetetraacetic acid tetrasodium salt, and 8.82wt% glycine.

[0052] The filling material in the present embodiment is a mixture of 2000 parts of heavy calcium powder and 1500 parts of fine sand. The quick-setting component in the present embodiment is a mixture of 7 parts of lithium carbonate and 400 parts of quick-setting lime. The moisture-retaining thickening component in the present embodiment is hydroxypropyl methylcellulose ether, and the viscosity is 200,000 cps.

[0053] The toughening and softening component in the present embodiment is 100 parts of redispersible latex powder and 50 parts of pp fiber. The mixing water in the present embodiment is tap water.

[0054] The preparation method of the self-repairing rapid repair cement-based mortar of the embodiment is as follows: the raw materials are prepared in proportion, the powders are uniformly mixed first, then mixing water is added and stirred uniformly, and the self-repairing rapid repair cement-based mortar can be obtained.

[0055] Embodiment 2

[0056] The embodiment discloses the composition and the preparation method of the self-repairing rapid repair cement-based mortar of the application.

[0057] The raw materials of the self-repairing rapid repair cement-based mortar of the embodiment are as follows: Composite cementitious material 5500 parts Inorganic penetrating crystalline material 500 parts Filling material 3500 parts Quick-setting component 500 parts Moisture-retention thickening component 4 parts Toughening and softening component 150 parts High-performance polycarboxylate superplasticizer 7 parts Mixing water 4000 parts.

[0058] The composite cementitious material in the embodiment is a mixture of 4400 parts of fast-hardening sulphoaluminate cement and 1100 parts of PO52.5R ordinary Portland cement.

[0059] The inorganic penetrating crystalline material in the embodiment is composed of the following components in the following proportions: 17.64wt% of sodium carbonate, 38.24wt% of sodium silicate, 17.65wt% of sodium aluminate, 17.65wt% of ethylenediaminetetraacetic acid tetrasodium salt and 8.82wt% of glycine.

[0060] The filling material in the embodiment is a mixture of 2000 parts of heavy calcium powder and 1500 parts of fine sand. The quick-setting component in the embodiment is a mixture of 10 parts of lithium carbonate and 490 parts of quick-burning lime. The moisture-retention thickening component in the embodiment is hydroxypropyl methyl cellulose ether with a viscosity of 200,000 cps.

[0061] The toughening and softening component in the embodiment is 10 parts of redispersible latex powder and 50 parts of pp fiber. The mixing water in the embodiment is tap water.

[0062] The preparation method of the self-repairing rapid repair cement-based mortar of the embodiment is as follows: the raw materials are prepared in proportion, the powders are uniformly mixed first, then mixing water is added and stirred uniformly, and the self-repairing rapid repair cement-based mortar can be obtained.

[0063] Embodiment 3

[0064] The embodiment discloses a composition and a preparation method of a self-repairing rapid repair cement-based mortar.

[0065] Raw materials of the self-repairing rapid repair cement-based mortar in the embodiment are as follows: Composite cementitious material 5500 parts Inorganic penetrating crystalline material 200 parts Filling material 2500 parts Quick-setting component 307 parts Moisture-retaining thickening component 2 parts Toughening and softening component 200 parts High-performance polycarboxylate superplasticizer 6 parts Mixing water 3300 parts.

[0066] The composite cementitious material in the embodiment is a mixture of 4400 parts of fast-hardening sulphoaluminate cement and 1100 parts of PO52.5R ordinary portland cement.

[0067] The inorganic penetrating crystalline material in the embodiment is composed of components with the following proportions: 16 wt% of sodium carbonate, 39 wt% of sodium silicate, 16 wt% of sodium aluminate, 20 wt% of tetrasodium ethylenediaminetetraacetate and 9 wt% of glycine.

[0068] The filling material in the embodiment is a mixture of 1500 parts of heavy calcium powder and 1000 parts of fine sand. The quick-setting component in the embodiment is a mixture of 7 parts of lithium carbonate and 300 parts of quick-burning lime. The moisture-retaining thickening component in the embodiment is hydroxypropyl methylcellulose ether with a viscosity of 200,000 cps.

[0069] The toughening and softening component in the embodiment is a mixture of 120 parts of redispersible latex powder and 80 parts of pp fiber. The mixing water in the embodiment is tap water.

[0070] The preparation method of the self-repairing rapid repair cement-based mortar in the embodiment is as follows: the raw materials are prepared according to the proportions, the powders are mixed uniformly, the mixing water is added and stirred uniformly, and then the self-repairing rapid repair cement-based mortar is obtained.

[0071] Embodiment 4

[0072] The embodiment discloses a composition and a preparation method of a self-repairing rapid repair cement-based mortar.

[0073] Raw materials of the self-repairing rapid repair cement-based mortar in the embodiment are as follows: Composite cementitious material 6500 parts Inorganic penetrating crystalline material 650 parts Filling material 3000 parts Quick-setting component 458 parts Moisture-retention and thickening component 5 parts Toughening and softening component 250 parts High-performance polycarboxylic water-reducing agent 10 parts Mixing water 3500 parts.

[0074] The composite cementitious material in the embodiment is a mixture of 5200 parts of quick-hardening sulphoaluminate cement and 1300 parts of PO52.5R ordinary portland cement.

[0075] The inorganic permeable crystalline material in the embodiment is composed of components in the following proportions: 20wt% sodium carbonate, 37wt% sodium silicate, 16wt% sodium aluminate, 16wt% tetrasodium ethylenediaminetetraacetate, and 11wt% glycine.

[0076] The filling material in the embodiment is a mixture of 1500 parts of heavy calcium powder and 1500 parts of fine sand. The quick-setting component in the embodiment is a mixture of 8 parts of lithium carbonate and 450 parts of quick-burning lime. The moisture-retention and thickening component in the embodiment is hydroxypropyl methylcellulose ether with a viscosity of 200,000 cps.

[0077] The toughening and softening component in the embodiment is 150 parts of redispersible latex powder and 100 parts of pp fiber. The mixing water in the embodiment is tap water.

[0078] The preparation method of the self-repairing rapid repair cement-based mortar in the embodiment is as follows: prepare the raw materials in proportion, mix the powders uniformly first, then add the mixing water and stir uniformly, and the self-repairing rapid repair cement-based mortar can be obtained.

[0079] Embodiment 5

[0080] The embodiment discloses the composition and preparation method of the self-repairing rapid repair cement-based mortar of the application.

[0081] The raw materials of the self-repairing rapid repair cement-based mortar in the embodiment are as follows: Composite cementitious material 5500 parts Inorganic permeable crystalline material 400 parts Filling material 1500 parts Quick-setting component 510 parts Moisture-retention and thickening component 5 parts Toughening and softening component 220 parts High-performance polycarboxylic water-reducing agent 8 parts Mixing water 5000 parts.

[0082] The composite cementitious material in the embodiment is a mixture of 4400 parts of fast-hardening sulphoaluminate cement and 1100 parts of PO52.5R ordinary portland cement.

[0083] The inorganic osmotic crystalline material in the embodiment is composed of components in the following proportions: 16wt% sodium carbonate, 41wt% sodium silicate, 20wt% sodium aluminate, 16wt% tetrasodium ethylenediaminetetraacetate, and 7wt% glycine.

[0084] The filler material in the embodiment is a mixture of 1000 parts of heavy calcium powder and 500 parts of fine sand. The quick-setting component in the embodiment is a mixture of 10 parts of lithium carbonate and 510 parts of fast-consumption quicklime. The moisture-retaining thickening component in the embodiment is hydroxypropyl methylcellulose ether with a viscosity of 200,000 cps.

[0085] The toughening and softening component in the embodiment is a mixture of 150 parts of redispersible latex powder and 70 parts of pp fiber. The mixing water in the embodiment is tap water.

[0086] The preparation method of the self-repairing rapid repair cement-based mortar in the embodiment is as follows: prepare the raw materials in proportion, mix the powders uniformly first, then add the mixing water and stir uniformly, and the self-repairing rapid repair cement-based mortar can be obtained.

[0087] Comparative Example 1 Comparative Example 1 does not contain inorganic osmotic crystalline material, uses fast-hardening sulphoaluminate cement to replace the rest of the composite cementitious material, and the other conditions are the same. That is, the raw material composition of the cement-based mortar in Comparative Example 1 is as follows: Fast-hardening sulphoaluminate cement 5500 parts Filler material 3500 parts Quick-setting component 407 parts Moisture-retaining thickening component 4 parts Toughening and softening component 150 parts High-performance polycarboxylic acid water reducer 7 parts Mixing water 4000 parts.

[0088] Test Example The performance of the cement-based mortar in Examples 1-5 and Comparative Example 1 was tested.

[0089] According to GB 23440-2009 "Inorganic Waterproof Plugging Material", the performance of the cement-based mortar in Examples 1-5 and Comparative Example 1 was tested, and the results are shown in Table 1.

[0090] Table 1 Performance test results of the cement-based mortar

[0091] The mortar compressive strength test was performed on the test block after 7d, and the load was added to 90% of the compressive strength as the limit load for extrusion to generate a test block with micro-cracks. The test block was re-placed in the standard curing box for continued curing for 28 days, and its performance was as shown in Table 2: Table 2

[0092] As shown in Table 1, using ordinary portland cement to replace part of the fast-hardening sulphoaluminate cement in proper proportion does not reduce the initial and final setting times of the paste, and does not significantly reduce the one-day strength of the test block; as shown in Table 2, the appropriate amount of penetration crystalline material does not reduce the compressive and flexural strengths of the test block at the same age, and after the load extrusion-re-curing process, the test block with the penetration crystalline material has a significantly improved impermeable pressure, reaching more than 1.0MPa, and has good sealing and waterproof performance, and as the amount of penetration crystalline material increases, the recovered impermeable pressure value is also higher, indicating that the penetration crystalline material can repair the micro-cracks caused by the applied load.

[0093] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification or equivalent change made according to the technical essence of the present application to the above embodiment falls within the protection scope of the present application.

Claims

1. A self-repairing rapid repair cement-based mortar, characterized in that, The raw materials include the following parts by weight: Composite cementitious material 5500~6500 parts; Inorganic osmotic crystalline material 200~650 parts; Filling material 1500~3500 parts; Quick-setting component 307~510 parts; Moisture-retaining and thickening component 2~5 parts; Toughening and softening component 150~250 parts; Water-reducing agent 6~10 parts; The composite cementitious material is a mixture of 1100~1300 parts by weight of P042.5R ordinary portland cement and 4400~5200 parts by weight of fast-hardening sulphoaluminate cement; The inorganic osmotic crystalline material is composed of the following components in the following proportions: 16~20wt% sodium carbonate, 37~41wt% sodium silicate, 16~20wt% sodium aluminate, 16~20wt% tetrasodium ethylenediaminetetraacetate, and 8~10wt% glycine.

2. A self-healing rapid repair cementitious based mortar according to claim 1, characterized in that, The inorganic osmotic crystalline material is composed of the following components in the following proportions: 17.65wt% sodium carbonate, 38.24wt% sodium silicate, 17.65wt% sodium aluminate, 17.65wt% tetrasodium ethylenediaminetetraacetate, and 8.82wt% glycine.

3. A self-healing rapid repair cementitious mortar according to claim 1 or 2, characterized in that, The filling material is a mixture of 1000~2000 parts by weight of heavy calcium powder and 500~1500 parts by weight of fine sand; preferably, the fine sand has a mesh size of 70~140.

4. A self-healing rapid repair cementitious based mortar according to claim 1 or 2, characterized in that, The quick-setting component is composed of 7-10 parts by weight of lithium carbonate and 300-500 parts by weight of quick-burning lime; preferably, the lithium carbonate is analytical pure lithium carbonate.

5. A self-healing rapid repair cementitious based mortar according to claim 1 or 2, characterized in that, The moisture-retaining and thickening component includes cellulose ether; preferably, the cellulose ether is hydroxypropyl methyl cellulose ether with a viscosity of 200,000 cps.

6. A self-healing rapid repair cementitious based mortar according to claim 1 or 2, characterized in that, The toughening and softening component includes 100~150 parts by weight of redispersible latex powder and 50~100 parts by weight of polypropylene (PP) fiber; preferably, the length of the PP fiber is ≤3mm.

7. A self-healing rapid repair cementitious based mortar according to claim 1 or 2, characterized in that, The water-reducing agent includes high-performance polycarboxylic acid water-reducing agent.

8. A method for preparing a self-healing, rapid-repairing cement-based mortar according to any one of claims 1-7, characterized in that, The method includes the following steps: preparing the raw materials in proportion, mixing uniformly, adding mixing water and mixing uniformly, and then obtaining the product.

9. A self-healing rapid repair cementitious based mortar according to claim 8, characterized in that, Adding 3300~5000 parts of mixing water and mixing uniformly.

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