Self-leveling rapid repair mortar based on steel slag solid waste cementing material and preparation method thereof

Abstract

The invention provides a self-leveling rapid repair mortar based on a steel slag solid waste cementing material and a preparation method thereof, the self-leveling rapid repair mortar comprises the following components in parts by mass: 100 parts of a self-leveling rapid repair mortar cementing material: 20-32 parts of steel slag powder, 20-30 parts of slag powder, 10-23 parts of raw ash, 10-15 parts of desulfurized gypsum, 5-8 parts of silica fume, and 8-25 parts of rapid hardening sulphoaluminate cement; the fine aggregate comprises 50 parts of quartz sand and 50 parts of steel slag aggregate; 0.3 to 0.7 part of a polyether defoaming agent, 0.05 to 0.25 part of lithium carbonate and 6 to 12 parts of a polycarboxylic acid water reducing agent; and 25-28 parts of water. According to the self-leveling rapid repair mortar based on the steel slag solid waste cementing material, on the basis of an alkali excitation synergistic sulfate excitation mechanism, the solid waste materials such as the steel slag powder, the slag powder, the raw ash and the desulfurized gypsum are utilized, and through proportioning optimization, the self-leveling rapid repair mortar which can open traffic within 2 hours and has the compressive strength gt within 28 days is prepared; the bonding strength is gt; the self-leveling mortar for rapidly repairing the cement concrete pavement has the advantages of self-leveling, no shrinkage of later strength and excellent durability.

Description

Technical Field

[0001] The invention relates to the technical field of rapid repair mortars, and in particular to a method for preparing a self-leveling rapid repair mortar based on steel slag solid waste cementitious material. Background Art

[0002] Steel slag is an industrial waste produced in the steel smelting process. Its current utilization rate is not high, and it is mainly used for cement-based materials and auxiliary cementitious materials in the field of building materials. If industrial solid waste such as steel slag cannot be effectively utilized, it will not only occupy a large amount of land resources, but may also cause permanent pollution and ecological damage to the surrounding environment.

[0003] Rapid repair materials are widely used in various repair projects due to their rapid solidification and high early strength. At present, pavement rapid repair materials are mainly divided into three categories: organic materials, inorganic materials and composite materials. Organic rapid repair materials are mainly composed of polymers and aggregates, and do not contain cement and water, but they are expensive and lack durability, and it is difficult to ensure the stability of the repair effect; inorganic rapid repair materials mainly include ordinary Portland cement and special cement. Although the cost is low, there are problems of later strength decline and too fast solidification time, which makes it difficult to widely promote in the engineering field; composite rapid repair materials combine the advantages of organic and inorganic rapid repair materials, and the cost is lower than that of organic materials, but its preparation process is more complicated, the manufacturing cost is higher, and the compatibility between materials is strict.

[0004] Patent application publication CN102424563A discloses a desulfurized gypsum-based antistatic self-leveling mortar and its preparation method. Although the patent application publication adopts steel slag, the technical solution disclosed in the patent is used for self-leveling mortar, and the various indicators of the obtained self-leveling mortar do not meet the requirements of leveling repair mortar at all.

[0005] Patent application publication CN117682833A discloses a steel slag blended solid waste-based sulphoaluminate cement-based antistatic self-leveling material. The various indicators of the self-leveling mortar obtained in the publication do not meet the requirements of the leveling repair mortar.

[0006] Patent application publication CN 105777042A discloses an anti-disturbance repair mortar and a method of using the same. Although steel slag material is used, due to differences in the configuration of the components of the repair mortar, the resulting repair mortar has a long setting time and poor material mechanical properties. Summary of the invention

[0007] The purpose of the present invention is to provide a self-leveling quick-repair mortar prepared based on steel slag solid waste cementitious material and a preparation method thereof, so as to achieve low-cost preparation of quick-repair mortar, high-value utilization of industrial solid waste, and solve the problem of strength shrinkage of quick-repair mortar in the later stage.

[0008] In order to achieve the above object, the present invention provides a self-leveling rapid repair mortar based on steel slag solid waste cementitious material, and the self-leveling rapid repair mortar comprises, by mass:

[0009] 100 parts of self-leveling rapid repair mortar cementitious materials, including: 20-32 parts of steel slag powder, 20-30 parts of slag powder, 10-23 parts of raw ash, 10-15 parts of desulfurized gypsum, 5-8 parts of silica fume, 8-25 parts of rapid hardening sulphoaluminate cement;

[0010] 100 parts of fine aggregate, including: 45-55 parts of quartz sand, 45-55 parts of steel slag aggregate; the fine aggregate can be adaptively configured according to actual conditions.

[0011] 0.3-0.7 parts of polyether defoamer, 0.05-0.25 parts of lithium carbonate, 6-12 parts of polycarboxylic acid water reducer;

[0012] 25-28 parts water.

[0013] The self-leveling rapid repair mortar based on steel slag solid waste cementitious material provided in the present application is based on the alkali-activated synergistic sulfate-activated mechanism, and utilizes solid waste materials such as steel slag powder, slag powder, raw ash, desulfurized gypsum, etc., and optimizes the proportions to prepare a self-leveling mortar for rapid repair of cement concrete pavement that can be open to traffic for 2 hours, has a compressive strength of >65MPa at 28 days, and a bonding strength of >2.5MPa. It has the characteristics of self-leveling, no shrinkage in strength in the later stage, and excellent durability.

[0014] In the above scheme, adding an appropriate amount of lithium carbonate can significantly shorten the hydration induction period of sulphoaluminate cement, improve the early strength of mortar and shorten the setting time; the addition of polyether defoamer can eliminate harmful large bubbles generated by mortar, reduce the internal porosity of mortar, and improve the density and stability of mortar. Polycarboxylate water reducer can effectively improve the fluidity of mortar and improve the construction performance of repair mortar.

[0015] In the present application, preferably, the particle size of the steel slag aggregate is 0.15mm-0.6mm, and the steel slag is steel slag that has been aged for more than half a year, and the free calcium oxide content is not more than 3%. As an industrial waste residue in the steel smelting process, steel slag can enhance the strength of mortar and improve structural stability; its wear resistance and chemical stability help mortar resist long-term wear and chemical erosion; in addition, steel slag helps control shrinkage, reduce cracks, and improve repair effects; the combination of steel slag and quartz sand can promote the sustainable utilization of resources and has significant economic and environmental benefits.

[0016] In the present application, preferably, the particle size of the quartz sand is 0.15 mm to 0.6 mm. Quartz sand mainly plays the role of aggregate support in mortar. Its high hardness and wear resistance can improve the strength and wear resistance of mortar and prevent mortar cracking; good grading can improve the fluidity of mortar and enhance the overall density of mortar.

[0017] In the present application, preferably, the chemical composition of the steel slag powder is as follows by mass fraction: SiO2: 12% to 19%, CaO: 33% to 37%, Fe2O3: 20% to 33%, MgO: 5% to 7%, and the rest are impurities.

[0018] Steel slag powder contains a small amount of C3S and C2S, and has certain gelling properties. It can react with sulphoaluminate cement to form hydrated ettringite (AFt) and hydrated calcium silicate (CSH) gel, which can ensure that the later strength of the mortar does not shrink.

[0019] In the present application, preferably, the chemical composition of the slag is as follows by mass fraction: Al2O3: 12% to 15%, SiO2: 25% to 30%, CaO: 42% to 45%, MgO: 6% to 8%, and the rest is impurities. Slag powder has potential activity, and its activity can be improved by grinding. It can generate hydrated calcium sulfoaluminate in mortar, accelerate cement hydration reaction, and improve the early strength of mortar; in addition, finer slag powder can fill the pores of mortar and improve its density.

[0020] In the present application, preferably, the chemical composition of the raw ash is as follows by mass fraction: Al2O3: 30% to 35%, SiO2: 40% to 48%, CaO: 4% to 13%, Fe2O3: 6% to 7%, and the rest is impurities. The raw ash has a certain "ball effect", which can enhance the fluidity of the mortar, inhibit the bleeding of the mortar, and ensure the later strength of the mortar.

[0021] In the present application, preferably, the chemical composition of the desulfurized gypsum is as follows: SO3: 40% to 47%, CaO: 40% to 45%, and the rest is impurities. Desulfurized gypsum provides sulfur and calcium sources for the hydration of the cementitious material, promotes early hydration, and makes the repair mortar have early strength and fast hardening characteristics.

[0022] In the present application, preferably, the chemical composition of the silica fume is as follows: SiO2: 80% to 90% by mass, and the rest is ash. Silica fume particles can provide "nucleation effect" for hydration products, accelerate early hydration of cement, shorten setting time, and enhance early strength of mortar.

[0023] In the present application, preferably, the specific surface area of ​​the steel slag powder is 600-650m 2 / kg, the specific surface area of ​​slag powder is 580~620m 2 / kg, the specific surface area of ​​desulfurized gypsum is 360~450m 2 / kg, the specific surface area of ​​silica fume is 350~450m 2 / kg, the specific surface area of ​​raw ash is 470~540m 2 / kg.

[0024] Based on the same inventive concept of the self-leveling quick-repair mortar described above, the present invention also provides a method for preparing a self-leveling quick-repair mortar based on steel slag solid waste cementitious material, comprising the following steps:

[0025] Fully mix 20 to 32 parts of steel slag powder, 20 to 30 parts of slag powder, 10 to 23 parts of raw ash, 10 to 15 parts of desulfurized gypsum, and 5 to 8 parts of silica fume according to parts by mass to obtain a steel slag-based all-solid waste gel material; fully mix 8 to 25 parts of fast-hardening sulphoaluminate cement with the steel slag-based all-solid waste gel material to obtain 100 parts of self-leveling rapid repair mortar cementitious material;

[0026] 100 parts of fine aggregate are obtained by fully mixing 50 parts of steel slag aggregate and 50 parts of quartz sand according to weight parts;

[0027] 0.05-0.25 parts of lithium carbonate, 0.3-0.7 parts of polyether defoamer, 6-12 parts of polycarboxylic acid water reducer, 100 parts of the self-leveling rapid repair mortar cementitious material and 100 parts of the fine aggregate are fully mixed to obtain a self-leveling rapid repair mortar powder;

[0028] After fully mixing 100 parts of the self-leveling rapid repair mortar cementitious material and 100 parts of the fine aggregate to obtain a self-leveling rapid repair mortar powder, 25 to 28 parts of water are added to the powder and the mixture is fully mixed to obtain a self-leveling rapid repair mortar based on steel slag solid waste cementitious material.

[0029] The beneficial effects of this application are:

[0030] 1. Environmentally friendly and low cost: The quick repair mortar prepared by the present invention contains industrial solid wastes such as steel slag powder, slag, desulfurized gypsum, fly ash, etc., which can reduce the cost of quick repair mortar, reduce carbon emissions, and achieve high added value utilization of industrial solid waste. This method can not only achieve low-cost preparation of quick repair mortar and high-value utilization of industrial solid waste, but also solve the problem of strength shrinkage of quick repair mortar in the later stage.

[0031] 2. High mechanical strength: The quick repair mortar prepared by the present invention has high mechanical strength, with a 2h compressive strength of not less than 25MPa and a flexural strength of not less than 4MPa; the 28d compressive strength can reach about 70MPa, the flexural strength is above 15MPa, and the bonding strength is greater than 2.5MPa.

[0032] 3. Good construction performance: The self-leveling rapid repair mortar prepared by the present invention has a fluidity of more than 300mm, and the surface after repair is flat and smooth, without defects such as cracks and pitting. The initial setting time is about 30 minutes, the setting speed is fast, the early strength is high, and the traffic can be opened in 2 hours, and the traffic closure time is short. It has high market value and great market potential, and can realize the high-value utilization of solid waste such as steel slag.

[0033] 4. The material of the present application effectively solves the problems of late strength shrinkage and poor durability of rapid repair mortar prepared mainly with rapid hardening sulfate cement. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0035] Figure 1 It is a construction process flow chart of the present invention. DETAILED DESCRIPTION

[0036] The specific implementation methods of the present application are described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] At present, the rapid repair mortars on the market are faced with problems such as high price, later strength reduction, and poor compatibility between materials, which limit their application scope; secondly, industrial solid wastes such as steel slag are not currently efficiently utilized, which makes them occupy land resources and damage the ecological environment;

[0038] In order to alleviate the occurrence of the above-mentioned problems, the inventors of the present application have studied the synergistic effect of solid wastes such as steel slag and sulphoaluminate cement to prepare a quick repair mortar with good fluidity, high later strength and excellent durability. This mortar can not only reduce costs, ensure later strength and improve durability, but also turn industrial solid wastes such as steel slag into treasure and improve their high-value utilization rate.

[0039] In the following examples, the specific surface area of ​​the ground steel slag powder is 600-650 m 2 / kg, the specific surface area of ​​slag powder is 580~620m 2 / kg, the specific surface area of ​​desulfurized gypsum is 360~450m 2 / kg, the specific surface area of ​​silica fume is 350~450m 2 / kg, the specific surface area of ​​raw ash is 470~540m 2 / kg.

[0040] In the following embodiments, the chemical composition of steel slag powder is as follows by mass fraction: SiO2: 12% to 19%, CaO: 33% to 37%, Fe2O3: 20% to 33%, MgO: 5% to 7%, and the rest are impurities. The chemical composition of slag is as follows by mass fraction: Al2O3: 12% to 15%, SiO2: 25% to 30%, CaO: 42% to 45%, MgO: 6% to 8%, and the rest are impurities. The chemical composition of desulfurized gypsum is as follows by mass fraction: SO3: 40% to 47%, CaO: 40% to 45%, and the rest are impurities. The chemical composition of raw ash is as follows by mass fraction: Al2O3: 30% to 35%, SiO2: 40% to 48%, CaO: 4% to 13%, Fe2O3: 6% to 7%, and the rest are impurities. The chemical composition of silica ash is as follows by mass fraction: SiO2: 80% to 90%, and the rest are ash. Since the composition of each particle of solid waste is not uniform, and the above-mentioned component value range is already a smaller range, the solid waste components used are all within a smaller range of reasonable fluctuation values, which does not affect the product performance obtained by technical personnel in this field when implementing the embodiments of the present application.

[0041] Below, the present invention is described by specific examples and comparative examples, which are as follows:

[0042] Example 1

[0043] Pretreatment: Grind the steel slag aggregate and slag produced by the No. 1 Steel Plant that have been aged for more than half a year to obtain steel slag powder and slag powder. Dry the desulfurized gypsum and raw ash and grind them to obtain dry desulfurized gypsum and raw ash;

[0044] Preparation method of self-leveling rapid repair mortar based on steel slag solid waste cementitious material:

[0045] S1. In a mixer, 350 g of steel slag powder, 336 g of slag powder, 140 g of raw ash, 210 g of desulfurized gypsum, and 84 g of silica fume are fully mixed to obtain a steel slag-based all-solid waste gel material; 280 g of fast-hardening sulphoaluminate cement is fully mixed with the steel slag-based all-solid waste gel material to obtain 1400 g of a self-leveling rapid repair mortar cementitious material;

[0046] S2. In a mixer, 700 g of slag aggregate and 700 g of quartz sand are fully mixed to obtain 1400 g of fine aggregate;

[0047] S3, in a mixer, 0.98g of lithium carbonate, 5.6g of polyether defoamer, 112g of polycarboxylic acid water reducer, 1400g of self-leveling rapid repair mortar cementitious material and 1400g of fine aggregate were mixed at a low speed for 60s to obtain a self-leveling rapid repair mortar powder;

[0048] S4. In a mixer, add 364 g of water to the self-leveling quick-repair mortar powder and stir at high speed for 120 seconds to fully mix to obtain a self-leveling quick-repair mortar based on steel slag solid waste cementitious material.

[0049] The mortar was poured into a fluidity test mold, a 40mm×40mm×160mm mortar test mold, a setting time test mold and a Ray's clamp test mold for molding, and the test data in Table 2 were obtained;

[0050] Embodiment 2 to Embodiment 4

[0051] The difference between Examples 2 to 4 and Example 1 is that different amounts of various material components are used in the preparation of the self-leveling rapid repair mortar, and the rest are the same as Example 1. The specific control parameters of each step are detailed in Table 1.

[0052] Embodiment 5-embodiment 6

[0053] The difference between Examples 5 and 6 and Example 1 is that in the preparation of self-leveling quick repair mortar, steel slag aggregate and slag produced by No. 2 Steel Plant are ground to obtain steel slag powder and slag powder, and the rest is the same as Example 1. The specific control parameters of each step are detailed in Table 1.

[0054] The mortar prepared in Examples 2 to 6 was poured into a fluidity test mold, a 40 mm × 40 mm × 160 mm mortar test mold, a setting time test mold and a Levitra clamp test mold for molding, and the test data in Table 2 were obtained;

[0055] Comparative Example 1

[0056] The difference between Comparative Example 1 and Example 1 is that the cement used in Comparative Example 1 is P.O42.5 silicate cement, and the rest is the same as Example 1. The control parameters of each step of Comparative Example 1 are detailed in Table 1.

[0057] The difference between Comparative Example 2 and Example 1 is that the steel slag aggregate in Comparative Example 2 is not aged, and the rest is the same as Example 1. The control parameters of each step of Comparative Example 2 are detailed in Table 1.

[0058] The difference between Comparative Example 3 and Example 1 is that the content of steel slag powder in Comparative Example 3 is relatively small, which is 200g. The rest is the same as Example 1. The control parameters of each step of Comparative Example 3 are detailed in Table 1.

[0059] The difference between Comparative Example 4 and Example 1 is that the specific surface area of ​​the slag powder in Comparative Example 4 is 500-560m 2 / kg, and the rest are the same as in Example 1. The control parameters of each step of Comparative Example 4 are detailed in Table 1.

[0060] The difference between Comparative Example 5 and Example 1 is that the silica fume content in Comparative Example 5 is relatively small, which is 14 g. The rest is the same as Example 1. The control parameters of each step of Comparative Example 5 are detailed in Table 1.

[0061] The difference between Comparative Example 6 and Example 1 is that the gypsum in Comparative Example 5 is phosphogypsum, and the rest is the same as Example 1. The control parameters of each step of Comparative Example 6 are detailed in Table 1.

[0062] The difference between Comparative Example 7 and Example 1 is that lithium carbonate is not added in Comparative Example 7, and the other steps are the same as Example 1. The control parameters of each step of Comparative Example 7 are shown in Table 1.

[0063] The difference between Comparative Example 8 and Example 1 is that no polyether defoaming agent is added in Comparative Example 8, and the other steps are the same as those in Example 1. The control parameters of each step of Comparative Example 8 are detailed in Table 1.

[0064] The difference between Comparative Example 9 and Example 1 is that no polycarboxylate water-reducing agent is added in Comparative Example 9, and the other steps are the same as those in Example 1. The control parameters of each step of Comparative Example 9 are detailed in Table 1.

[0065] The mortars prepared in Comparative Examples 1 to 9 were poured into a fluidity test mold, a 40 mm×40 mm×160 mm mortar test mold, a setting time test mold, and a Leclerc clamp test mold for molding, and the test data in Table 2 were obtained:

[0066] Table 1 Control of dosage of each component in each embodiment and comparative example

[0067]

[0068]

[0069] Table 2 Test index data of repair mortar obtained from comparative examples of various embodiments

[0070]

[0071] It can be seen from Example 1 and Example 2 that by changing the mass fraction of each component within the allowable range, the obtained self-leveling quick repair mortar still maintains good performance. It can be seen from Example 5 and Example 6 Example 2 that by changing the sources of raw materials such as steel slag and slag, while keeping other factors unchanged, the performance of the obtained self-leveling quick repair mortar fluctuates within a certain range.

[0072] By comparing Comparative Example 1 with Example 1, it can be seen that the overall performance of the repair mortar obtained in Comparative Example 1 is significantly reduced. This is because the cement used in Comparative Example 1 is silicate cement, which cannot have a good synergistic effect with solid wastes such as steel slag, while Example 1 utilizes the synergistic effect of solid wastes such as steel slag and sulphoaluminate cement. The steel slag powder contains a small amount of C3S and C2S, has a certain gelling property, and can react with sulphoaluminate cement to form hydrated calcium aluminate (AFt) and hydrated calcium silicate (CSH) gel, which can ensure that the later strength of the mortar does not shrink, and prepare a fast repair mortar with good fluidity, high later strength and excellent durability, which can not only reduce costs, ensure later strength, and improve durability, but also turn industrial solid wastes such as steel slag into treasures and improve their high-value utilization rate.

[0073] By comparing Comparative Example 2 with Example 1, it can be seen that the performance of the repair mortar obtained in Comparative Example 2 is inferior to that in Example 1. This is because the steel slag aggregate in Comparative Example 2 was not aged, and the calcium content in the steel slag aggregate that was not aged seriously exceeded the standard. The free calcium oxide content of the steel slag aggregate in Comparative Example 2 was as high as 15%, resulting in cracks in the repair mortar. The steel slag aggregate in Example 1 was aged for more than half a year, and aging the steel slag aggregate can reduce its free calcium oxide content. The free calcium oxide content of the steel slag aggregate in Example 1 is less than 3%.

[0074] By comparing Comparative Example 3 with Example 1, it can be seen that the performance of the repair mortar obtained in Comparative Example 3 is inferior to that in Example 1. This is because the proportion of steel slag powder in Comparative Example 3 is relatively small, while in Example 1, the amount of steel slag powder added is 350g. Slag powder has potential activity and can generate hydrated calcium sulfoaluminate in the mortar, accelerate the cement hydration reaction, and improve the early strength of the mortar.

[0075] By comparing Comparative Example 4 and Example 1, it can be seen that the performance of the repair mortar obtained in Comparative Example 4 is inferior to that in Example 1. This is because the particle size of the slag powder in Comparative Example 4 is relatively large and the specific surface area is relatively small; while in Example 1, the slag powder particles are relatively small and the specific surface area is relatively large. The finer slag powder can fill the pores of the mortar, improve its density, and also increase its activity, thereby improving the performance of the repair mortar.

[0076] By comparing Comparative Example 5 with Example 1, it can be seen that the performance of the repair mortar obtained in Comparative Example 5 is inferior to that in Example 1, because the silica fume content in Comparative Example 5 is relatively low. In Example 1, the silica fume particles can provide "nucleation effect" for the hydration product, accelerate the early hydration of cement, shorten the setting time, and enhance the early strength of the mortar.

[0077] By comparing Comparative Example 6 with Example 1, it can be seen that the performance of the repair mortar obtained in Comparative Example 6 is inferior to that in Example 1. This is because the gypsum used in Comparative Example 6 is phosphogypsum, while in Example 1, desulfurized gypsum is used. The desulfurized gypsum provides a sulfur source and a calcium source for the hydration of the cementitious material, promotes early hydration, and makes the repair mortar have the characteristics of early strength and rapid hardening.

[0078] By comparing Comparative Example 7 and Example 1, it can be seen that the performance of the repair mortar obtained in Comparative Example 7 is inferior to that in Example 1. This is because Comparative Example 7 does not add lithium carbonate, while in Example 1, the addition of an appropriate amount of lithium carbonate can significantly shorten the hydration induction period of sulfoaluminate cement, improve the early strength of the mortar and shorten the setting time.

[0079] By comparing Comparative Example 8 and Example 1, it can be seen that the performance of the repair mortar obtained in Comparative Example 8 is inferior to that in Example 1. This is because Comparative Example 8 does not add a polyether defoamer, while in Example 1, a small amount of polyether defoamer is added. The addition of the polyether defoamer can eliminate harmful large bubbles generated by the mortar and reduce the internal porosity of the mortar, thereby improving the density and stability of the sand mortar.

[0080] By comparing Comparative Example 9 with Example 1, it can be seen that Comparative Example 9 does not add a water reducer, resulting in failure to obtain a repair mortar. However, Example 1 adds a polycarboxylate water reducer, which can effectively increase the fluidity of the mortar and improve the construction performance of the repair mortar.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-leveling quick-repair mortar based on steel slag solid waste cementitious material, characterized in that: The self-leveling quick repair mortar comprises, by mass: 100 parts of self-leveling rapid repair mortar cementitious materials, including: 20-32 parts of steel slag powder, 20-30 parts of slag powder, 10-23 parts of raw ash, 10-15 parts of desulfurized gypsum, 5-8 parts of silica fume, 8-25 parts of rapid hardening sulphoaluminate cement; 100 parts of fine aggregate, including: 45-55 parts of quartz sand, 45-55 parts of steel slag aggregate; 0.3-0.7 parts of polyether defoamer, 0.05-0.25 parts of lithium carbonate, 6-12 parts of polycarboxylic acid water reducer; 25-28 parts of water.

2. The self-leveling quick repair mortar according to claim 1, characterized in that: The particle size of the steel slag aggregate is 0.15 mm to 0.6 mm, and the steel slag is steel slag that has been aged for more than half a year, and the free calcium oxide content is not more than 3%.

3. The self-leveling quick repair mortar according to claim 1, characterized in that: The particle size of the quartz sand is 0.15 mm to 0.6 mm.

4. The self-leveling quick repair mortar according to claim 1, characterized in that: The chemical composition of the steel slag powder is as follows by mass fraction: SiO2: 12% to 19%, CaO: 33% to 37%, Fe2O3: 20% to 33%, MgO: 5% to 7%, and the rest are impurities.

5. The self-leveling quick repair mortar according to claim 1, characterized in that: The chemical composition of the slag is as follows by mass fraction: Al2O3: 12% to 15%, SiO2: 25% to 30%, CaO: 42% to 45%, MgO: 6% to 8%, and the rest are impurities.

6. The self-leveling quick repair mortar according to claim 1, characterized in that: The chemical composition of the raw ash is as follows by mass fraction: Al2O3: 30% to 35%, SiO2: 40% to 48%, CaO: 4% to 13%, Fe2O3: 6% to 7%, and the rest are impurities.

7. The self-leveling quick repair mortar according to claim 1, characterized in that: The chemical composition of the desulfurized gypsum is as follows by mass fraction: SO3: 40% to 47%, CaO: 40% to 45%, and the rest are impurities.

8. The self-leveling quick repair mortar according to claim 1, characterized in that: The chemical composition of the silica fume is as follows by mass fraction: SiO2: 80% to 90%, and the rest is ash.

9. The self-leveling quick repair mortar according to claim 1, characterized in that: The specific surface area of ​​the steel slag powder is 600-650m 2 / kg, the specific surface area of ​​slag powder is 580~620m 2 / kg, the specific surface area of ​​desulfurized gypsum is 360~450m 2 / kg, the specific surface area of ​​silica fume is 350~450m 2 / kg, the specific surface area of ​​raw ash is 470~540m 2 / kg.

10. A method for preparing self-leveling rapid repair mortar based on steel slag solid waste cementitious material, characterized in that: The following steps are involved: Fully mix 20 to 32 parts of steel slag powder, 20 to 30 parts of slag powder, 10 to 23 parts of raw ash, 10 to 15 parts of desulfurized gypsum, and 5 to 8 parts of silica fume according to parts by mass to obtain a steel slag-based all-solid waste gel material; fully mix 8 to 25 parts of fast-hardening sulphoaluminate cement with the steel slag-based all-solid waste gel material to obtain 100 parts of self-leveling rapid repair mortar cementitious material; 100 parts of fine aggregate are obtained by fully mixing 50 parts of steel slag aggregate and 50 parts of quartz sand according to weight parts; 0.05-0.25 parts of lithium carbonate, 0.3-0.7 parts of polyether defoamer, 6-12 parts of polycarboxylic acid water reducer, 100 parts of the self-leveling rapid repair mortar cementitious material and 100 parts of the fine aggregate are fully mixed to obtain a self-leveling rapid repair mortar powder; After fully mixing 100 parts of the self-leveling rapid repair mortar cementitious material and 100 parts of the fine aggregate to obtain a self-leveling rapid repair mortar powder, 25 to 28 parts of water are added to the powder and the mixture is fully mixed to obtain a self-leveling rapid repair mortar based on steel slag solid waste cementitious material.

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