Preparation method of alkali aggregate inhibitor based on lithium slag and phosphorus slag multi-solid-waste materials, common concrete doped with alkali aggregate inhibitor and preparation method of common concrete

Abstract

The invention discloses a preparation method of an alkali aggregate inhibitor based on lithium slag and phosphorus slag multi-solid-waste materials, common concrete doped with the alkali aggregate inhibitor and a preparation method of the common concrete. The preparation method of the alkali aggregate inhibitor comprises the following steps: firstly weighing 25-50 parts of lithium slag powder, 30-40 parts of phosphorus slag powder, 15-25 parts of silicon powder, 5-10 parts of sodium sulfate and 0.05-0.2 part of triterpenoid saponin, mixing the pretreated lithium slag powder and phosphorus slag powder with the silicon powder, sodium sulfate and triterpenoid saponin, and uniformly stirring to obtain the alkali aggregate inhibitor based on the lithium slag and phosphorus slag multi-solid waste materials. The alkali aggregate inhibitor is prepared by taking the lithium slag powder, the phosphorus slag powder, the silicon powder, the sodium sulfate and the triterpenoid saponin as raw materials, and then 10-20wt% of cement is replaced by the alkali aggregate inhibitor in equal mass, so that not only can the generation of alkali aggregate be inhibited, but also the compressive strength, the impermeability, the freezing resistance and the like of the concrete can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of concrete, and in particular relates to a method for preparing an alkali-aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials, ordinary concrete added with the alkali-aggregate inhibitor and a preparation method thereof. Background Art

[0002] Currently, lithium salts and their complexes, which are the most effective alkali-aggregate inhibitors, are expensive, which hinders their large-scale application.

[0003] With the growth of lithium ore smelting scale, the output of lithium slag has increased year by year, and the necessity of its resource utilization has become increasingly prominent. Lithium slag is a by-product of lithium salt extraction. Every ton of lithium carbonate smelting produces about 30 tons of lithium slag. Therefore, the resource utilization of lithium slag not only helps to solve the problem of solid waste disposal but also reduces material costs. Lithium slag not only contains trace amounts of lithium elements, but also contains a large amount of SiO2 and Al2O3. The main components of phosphorus slag are SiO2 and CaO, both of which have high volcanic ash activity and can consume alkaline substances in the concrete system, causing secondary hydration reactions and generating stable hydration products. Developing alkali aggregate inhibitors based on multiple solid waste materials such as lithium slag and phosphorus slag and applying them to concrete can improve the durability and other properties of concrete.

[0004] The patent entitled "A method for treating lithium slag produced as a byproduct of lithium extraction from a salt lake, a concrete alkali-aggregate reaction inhibitor and its application" (patent number CN201410150737.1) provides a concrete alkali-aggregate inhibitor using lithium slag as raw material, which grinds the lithium slag produced as a byproduct of lithium extraction from a salt lake and sieves it, then washes, precipitates, filters, collects the solid and dries it. The obtained lithium slag can be used as an inhibitor for concrete alkali-aggregate reaction, which avoids the aggravation of concrete steel bar corrosion and concrete alkali-aggregate reaction by sodium chloride, and has the characteristics of low dosage and good inhibitory effect. The patent uses the prepared alkali-aggregate inhibitor to replace part of the cement in the preparation of concrete at a ratio of 30%, and the expansion rate of the concrete can reach a minimum of 0.081 after 21 days.

[0005] The patent entitled "Concrete Alkali Aggregate Reaction Inhibitor and Concrete Based on Industrial Solid Waste Materials" (Patent No. CN202110255011.4) provides an alkali aggregate reaction inhibitor, which includes the following raw materials in parts by weight: 20 to 60 parts by weight of phosphorus slag powder, 60 to 120 parts by weight of fly ash, 20 to 40 parts by weight of silica fume, 0.1 to 0.25 parts by weight of lithium carbonate, 0.1 to 0.3 parts by weight of barium nitrate, and 0.1 to 0.2 parts by weight of barium chloride. The inhibitor is applied to ordinary concrete, and the expansion rate can be as low as 0.009% after curing for 14 days.

[0006] In both of the above patents, lithium slag and / or phosphorus slag are used as partial components for preparing alkali aggregate inhibitors. After the prepared alkali aggregate inhibitors are applied to concrete, the expansion rate can meet the use requirements, but the effect of inhibiting alkali reaction still has room for improvement. Secondly, due to the porous structure, large specific surface area and large water demand of lithium slag powder, it is easy to cause the fluidity of concrete to decrease. When phosphorus slag powder is added to the cement system, the cement setting time becomes longer, which is easy to reduce the early strength of concrete. Therefore, it is very necessary to utilize the synergistic effect of the characteristics of lithium slag and phosphorus slag to develop an alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials that can inhibit the occurrence of alkali aggregate reaction and improve the compressive strength, impermeability and frost resistance of concrete. Summary of the invention

[0007] In order to give full play to the activity of lithium slag and phosphorus slag, the present invention proposes a preparation method of alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials, ordinary concrete added with alkali aggregate inhibitor and its preparation method. The waste slag is calcined at high temperature, rapidly cooled and then ground into powder, and compounded with other minerals, which can not only inhibit the occurrence of alkali aggregate reaction, but also improve the compressive strength, impermeability and frost resistance of concrete.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] Technical purpose 1: An alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials, comprising the following raw materials in parts by weight: 25-50 parts of lithium slag powder, 30-40 parts of phosphorus slag powder, 15-25 parts of silicon powder, 5-10 parts of sodium sulfate and 0.05-0.2 parts of triterpenoid saponin; the lithium slag powder needs to be pretreated by high-temperature calcination before use; the phosphorus slag powder needs to be pretreated by high-temperature calcination before use.

[0010] Furthermore, the high temperature calcination pretreatment method of the lithium slag powder is specifically as follows: calcining the lithium slag at 900°C, at which the ball forming rate is the highest, and then grinding it to a fineness of 800 μm. 2 / kg, and the balling rate is above 70%.

[0011] Furthermore, the high temperature calcination pretreatment method of the phosphorus slag powder is specifically as follows: the phosphorus slag, quartz sand and natural natron are uniformly mixed, calcined at high temperature to a molten state, and then rapidly cooled and ground to a fineness of 400 μm. 2 / kg.

[0012] Furthermore, the mass ratio of the phosphorus slag powder, quartz sand and natural natron is 20:1:0.5.

[0013] Technical purpose 2: A method for preparing an alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials, comprising the following steps: weighing the raw materials by mass, mixing the pretreated lithium slag powder and phosphorus slag powder with silicon powder, sodium sulfate and triterpenoid saponin, and stirring evenly.

[0014] Technical purpose three: An ordinary concrete with an alkali-aggregate inhibitor added, using the alkali-aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials to replace 10-20wt% of cement.

[0015] Furthermore, the ordinary concrete comprises the following raw materials in parts by weight: 14-16 parts of cement, 1-4 parts of alkali aggregate inhibitor, 30 parts of artificial sand, 45 parts of gravel and 7.5 parts of water.

[0016] Furthermore, the artificial sand has alkali activity, the alkali-active aggregate accounts for 3.2% of the mass percentage of the artificial sand, and the sand fineness modulus is 2.8.

[0017] Furthermore, the stones include stones with a particle size of 5-10 mm, stones with a particle size of 10-16 mm and stones with a mass ratio of 1:1:1.

[0018] Technical purpose 4: A method for preparing ordinary concrete with alkali-aggregate inhibitor, comprising the following steps: weighing raw materials by mass, mixing cement, alkali-aggregate inhibitor, artificial sand, gravel and water, and stirring to obtain ordinary concrete.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] The present invention calcines and grinds lithium slag and phosphorus slag at high temperature, and then compounds them with silicon powder, sodium sulfate and powdered triterpenoid saponin to form an alkali aggregate inhibitor, which replaces 10-20wt% of cement with equal mass, consumes alkali in the system through secondary reaction with cement, and thus plays a role in inhibiting alkali aggregate reaction. The ground lithium slag powder has a vitreous structure, and the fluidity of concrete is increased through the vitreous effect. The ground phosphorus slag powder and silicon powder can make the concrete system more compact and improve the impermeability of concrete. Sodium sulfate promotes the early strength hydration of cement and reduces the early strength loss caused by the addition of phosphorus slag. The powdered triterpenoid saponin introduces tiny bubbles, increases the fluidity of concrete, and the pores generated after the concrete hardens can provide a migratable buffer space for the expansive alkali silica gel formed by the alkali-silica reaction between the active aggregate and the slurry interface, thereby reducing the expansion rate; the introduction of tiny bubbles can also improve the frost resistance of concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 This is a SEM image of the ground lithium slag powder in the present invention;

[0023] Figure 2 This is a SEM image of the ground phosphorus slag powder in the present invention. DETAILED DESCRIPTION

[0024] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0025] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0026] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0027] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

[0028] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0029] An alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials comprises the following raw materials in parts by weight: 25-50 parts of lithium slag powder, 30-40 parts of phosphorus slag powder, 15-25 parts of silicon powder, 5-10 parts of sodium sulfate and 0.05-0.2 parts of triterpenoid saponin.

[0030] In the following embodiments of the present invention, the lithium slag powder needs to be pre-treated before use, specifically: the lithium slag is calcined at 900°C, and then ground into 800m 2 / kg fineness, the surface of the ball is smooth when observed under a scanning electron microscope, and the ball formation rate is above 70% (see Figure 1 ).

[0031] In the following embodiments of the present invention, the phosphorus slag powder needs to be pretreated before use, specifically: phosphorus slag, quartz sand (40-70 mesh) and natural natron are uniformly mixed in a mass ratio of 20:1:0.5, calcined at high temperature to a molten state (in the embodiments of the present invention, it is sufficient to control the calcination temperature until the material becomes a molten state, and experimental verification generally requires a temperature of 1350°C or above), quenched with water, rapidly cooled, and then ground into 400m using an ultrafine grinder. 2 / kg fineness, under the scanning electron microscope, the particle size is uneven, the particle surface is smooth, and the shape is a polyhedron with clear edges and corners (see Figure 2 ).

[0032] The preparation method of the alkali aggregate inhibitor based on lithium slag and phosphorus slag multi-solid waste materials comprises the following steps: weighing raw materials by mass, mixing pretreated lithium slag powder and phosphorus slag powder with silicon powder, sodium sulfate and triterpenoid saponin, and stirring evenly.

[0033] The invention discloses a common concrete with alkali aggregate inhibitor, which mainly replaces 10-20wt% of cement by using the alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials.

[0034] In some preferred embodiments of the present invention, the ordinary concrete includes the following raw materials in parts by weight: 14-16 parts of cement, 1-4 parts of alkali aggregate inhibitor, 30 parts of artificial sand, 15 parts of 5-10mm gravel (including 5mm and 10mm), 15 parts of 10-16mm gravel (including 16mm, excluding 10mm), 15 parts of 16-20mm gravel (including 20mm, excluding 16mm) and 7.5 parts of water.

[0035] In some preferred embodiments of the present invention, the artificial sand has alkali activity, the alkali-active aggregate accounts for 3.2% of the mass percentage of the artificial sand, and the sand fineness modulus is 2.8.

[0036] The method for preparing common concrete with alkali-aggregate inhibitor comprises the following steps: weighing raw materials according to mass, mixing cement, alkali-aggregate inhibitor, artificial sand, gravel and water, and stirring to obtain common concrete.

[0037] The "parts" described in the present invention, unless otherwise specified, refer to parts by mass.

[0038] The raw materials used in the present invention are all purchased from the market.

[0039] The technical solution of the present invention is further illustrated by the following embodiments.

[0040] Example 1

[0041] An alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials comprises the following raw materials in parts by weight: 25 parts of lithium slag powder, 40 parts of phosphorus slag powder, 25 parts of silicon powder, 10 parts of sodium sulfate and 0.05 parts of triterpenoid saponin.

[0042] The lithium slag was calcined at 900°C and then ground into 800m 2 / kg fineness, the surface of the ball is smooth under the scanning electron microscope, and the ball formation rate is above 70%; phosphorus slag, quartz sand (40-70 mesh) and natural natron are mixed evenly in a mass ratio of 20:1:0.5, calcined at 1350℃ to a molten state; after rapid cooling, it is ground into 400m using an ultrafine grinder. 2 / kg fineness.

[0043] Preparation of alkali aggregate inhibitor based on lithium slag and phosphorus slag solid waste materials: weigh the raw materials according to the above mass, mix the lithium slag powder and phosphorus slag powder with silicon powder, sodium sulfate and triterpenoid saponin, and stir well.

[0044] Application Example 1

[0045] A common concrete with an alkali-aggregate inhibitor added (the alkali-aggregate inhibitor replaces 10wt% of cement by mass), comprising the following raw materials in parts by mass: 15.75 parts of silicate 42.5 cement, 1.75 parts of the alkali-aggregate inhibitor prepared in Example 1, 30 parts of artificial sand, 15 parts of 5-10mm gravel, 15 parts of 10-16mm gravel, 15 parts of 16-20mm gravel and 7.5 parts of water.

[0046] Preparation of ordinary concrete with alkali-aggregate inhibitor:

[0047] Raw materials are weighed by mass, and silicate 42.5 cement, alkali aggregate inhibitor, artificial sand, gravel and water are mixed and stirred in a compulsory mixer for 2 minutes to obtain ordinary concrete.

[0048] Example 2

[0049] An alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials comprises the following raw materials in parts by weight: 50 parts of lithium slag powder, 30 parts of phosphorus slag powder, 15 parts of silicon powder, 5 parts of sodium sulfate and 0.15 parts of triterpenoid saponin.

[0050] The lithium slag was calcined at 900°C and then ground into 800m 2 / kg fineness, the surface of the ball is smooth under the scanning electron microscope, and the ball formation rate is above 70%; phosphorus slag, quartz sand (40-70 mesh) and natural natron are mixed evenly in a mass ratio of 20:1:0.5, calcined at 1350℃ to a molten state; after rapid cooling, it is ground into 400m using an ultrafine grinder. 2 / kg fineness.

[0051] Preparation of alkali aggregate inhibitor based on lithium slag and phosphorus slag solid waste materials: weigh the raw materials according to the above mass, mix the lithium slag powder and phosphorus slag powder with silicon powder, sodium sulfate and triterpenoid saponin, and stir well.

[0052] Application Example 2

[0053] A common concrete with an alkali-aggregate inhibitor added (the alkali-aggregate inhibitor replaces 14.9wt% of cement by weight), comprising the following raw materials in parts by weight: 14.9 parts of silicate 42.5 cement, 2.6 parts of the alkali-aggregate inhibitor prepared in Example 2, 30 parts of artificial sand, 15 parts of 5-10mm gravel, 15 parts of 10-16mm gravel, 15 parts of 16-20mm gravel and 7.5 parts of water.

[0054] Preparation of ordinary concrete with alkali-aggregate inhibitor:

[0055] Raw materials are weighed by mass, and silicate 42.5 cement, alkali aggregate inhibitor, artificial sand, gravel and water are mixed and stirred in a compulsory mixer for 2 minutes to obtain ordinary concrete.

[0056] Example 3

[0057] An alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials comprises the following raw materials in parts by weight: 40 parts of lithium slag powder, 35 parts of phosphorus slag powder, 17 parts of silicon powder, 8 parts of sodium sulfate and 0.2 parts of triterpenoid saponin.

[0058] The lithium slag was calcined at 900°C and then ground into 800m 2 / kg fineness, the surface of the ball is smooth under the scanning electron microscope, and the ball formation rate is above 70%; phosphorus slag, quartz sand (40-70 mesh) and natural natron are mixed evenly in a mass ratio of 20:1:0.5, calcined at 1350℃ to a molten state; after rapid cooling, it is ground into 400m using an ultrafine grinder. 2 / kg fineness.

[0059] Preparation of alkali aggregate inhibitor based on lithium slag and phosphorus slag solid waste materials: weigh the raw materials according to the above mass, mix the lithium slag powder and phosphorus slag powder with silicon powder, sodium sulfate and triterpenoid saponin, and stir well.

[0060] Application Example 3

[0061] A common concrete with an alkali-aggregate inhibitor added (the alkali-aggregate inhibitor replaces 20wt% of cement by weight), comprising the following raw materials in parts by weight: 14 parts of silicate 42.5 cement, 3.5 parts of the alkali-aggregate inhibitor prepared in Example 3, 30 parts of artificial sand, 15 parts of 5-10mm gravel, 15 parts of 10-16mm gravel, 15 parts of 16-20mm gravel and 7.5 parts of water.

[0062] Preparation of ordinary concrete with alkali-aggregate inhibitor:

[0063] Raw materials are weighed by mass, and silicate 42.5 cement, alkali aggregate inhibitor, artificial sand, gravel and water are mixed and stirred in a compulsory mixer for 2 minutes to obtain ordinary concrete.

[0064] Comparative application example 1

[0065] The same as Application Example 3, except that no alkali aggregate inhibitor is added, that is, the ordinary concrete includes the following raw materials in parts by weight: 17.5 parts of silicate 42.5 cement, 30 parts of artificial sand, 15 parts of 5-10 mm gravel, 15 parts of 10-16 mm gravel, 15 parts of 16-20 mm gravel and 7.5 parts of water.

[0066] The preparation method is the same as that of Application Example 3.

[0067] The concrete prepared in Application Examples 1-3 and Comparative Application Example 1 was subjected to performance tests (test standard: GB / T50082 "Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete"), and the results are shown in Table 1.

[0068] Table 1 Performance test results of different concretes in Application Examples 1-3 and Comparative Application Example 1

[0069]

[0070] Through comparative analysis of the application examples and the application examples, and through comparison of the expansion rates, it was found that after adding the alkali-aggregate inhibitor, the alkali-aggregate reaction was significantly inhibited, and the 28d concrete strength was significantly higher than that of the comparative application examples. After 28d, the anti-freeze and anti-permeability tests were carried out, and the anti-freeze and anti-permeability grades of the application examples were greatly improved.

[0071] Application Example 4

[0072] Same as Application Example 3, except that the alkali aggregate inhibitor prepared in Example 3 replaces 15wt% of cement by weight. That is, the ordinary concrete with alkali aggregate inhibitor added includes the following raw materials by weight: 14.9 parts of silicate 42.5 cement, 2.6 parts of alkali aggregate inhibitor prepared in Example 3, 30 parts of artificial sand, 15 parts of 5-10mm stone, 15 parts of 10-16mm stone, 15 parts of 16-20mm stone and 7.5 parts of water.

[0073] Application Example 5

[0074] Same as Application Example 3, except that the alkali aggregate inhibitor prepared in Example 3 replaces 10wt% of cement by weight. That is, the ordinary concrete with alkali aggregate inhibitor added includes the following raw materials by weight: 15.75 parts of silicate 42.5 cement, 1.75 parts of alkali aggregate inhibitor prepared in Example 3, 30 parts of artificial sand, 15 parts of 5-10mm stone, 15 parts of 10-16mm stone, 15 parts of 16-20mm stone and 7.5 parts of water.

[0075] Comparative Example 1

[0076] The same as Example 3, except that the alkali aggregate inhibitor comprises the following raw materials in parts by weight: 15 parts of lithium slag powder, 65 parts of phosphorus slag powder, 10 parts of silicon powder, 10 parts of sodium sulfate and 0.4 parts of triterpenoid saponin.

[0077] Comparative Application Example 2

[0078] The same as Application Example 3, except that the alkali-aggregate inhibitor prepared in Example 3 in Application Example 3 is replaced by the alkali-aggregate inhibitor prepared in Comparative Example 1 of equal mass.

[0079] Comparative Example 2

[0080] Same as Example 3, except that the mass fraction of triterpenoid saponin is replaced by sodium dodecyl sulfate (which can introduce air bubbles).

[0081] Comparative Application Example 3

[0082] The same as Application Example 3, except that the alkali-aggregate inhibitor prepared in Example 3 in Application Example 3 is replaced by the alkali-aggregate inhibitor prepared in Comparative Example 2 of the same mass.

[0083] Comparative Example 3

[0084] The same as Example 3, except that the phosphorus slag and lithium slag are not pre-treated by high-temperature calcination.

[0085] Comparative Application Example 4

[0086] The same as Application Example 3, except that the alkali-aggregate inhibitor prepared in Example 3 in Application Example 3 is replaced by the alkali-aggregate inhibitor prepared in Comparative Example 3 of the same mass.

[0087] Comparative Example 4

[0088] The same as Example 3, except that the addition of triterpenoid saponin and sodium sulfate is omitted.

[0089] Comparative Application Example 5

[0090] The same as Application Example 3, except that the alkali-aggregate inhibitor prepared in Example 3 in Application Example 3 is replaced by the alkali-aggregate inhibitor prepared in Comparative Example 4 of the same mass.

[0091] The concrete prepared in Comparative Application Examples 2-5 and Application Examples 4-5 was subjected to performance tests, and the results are shown in Table 2.

[0092] Table 2 Comparison of performance test results of different concretes in Application Examples 2-5 and 4-5

[0093]

[0094] As can be seen from Table 2, the phosphorus slag and phosphorus slag in the alkali aggregate inhibitor used in Comparative Application Example 4 were not subjected to high-temperature calcination treatment, but were used directly. The expansion rate of the prepared concrete specimens reached 0.038% in the 52nd week, which is close to the standard critical value, and its effect of inhibiting alkali reaction is inferior to that of Application Examples 1 to 5. In addition, the 28-day compressive strength, frost resistance grade and impermeability grade are generally lower than those of the application examples.

[0095] Comparative Example 5 uses an alkali-aggregate inhibitor in which the addition of triterpenoid saponin and sodium sulfate is omitted. The prepared concrete specimens not only have a much higher expansion rate than Application Examples 1-5, but also their 28-day compressive strength, frost resistance grade and impermeability grade are generally inferior to those of the application examples.

[0096] Compared with Application Example 3, the dosage of lithium slag powder and silicon powder in Application Example 2 is reduced, and the dosage of phosphorus slag powder, sodium sulfate and triterpenoid saponin is increased. Although the expansion rate of the prepared concrete is lower than that in Application Example 3, the 28-day compressive strength, frost resistance grade and impermeability grade are not as good as those in Application Example 3.

[0097] Compared with Application Example 4, the triterpenoid saponin in the inhibitor was replaced with sodium dodecyl sulfate. Although the expansion rate of the prepared concrete was lower than that of Application Example 3, the 28-day compressive strength, frost resistance grade and impermeability grade were significantly lower than those of Application Example 3.

[0098] In summary, the alkali-aggregate inhibitor provided by the present invention can synergistically improve the expansion rate, impermeability, frost resistance and compressive strength of concrete.

[0099] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials, characterized in that: The invention comprises the following raw materials in parts by weight: 25-50 parts of lithium slag powder, 30-40 parts of phosphorus slag powder, 15-25 parts of silicon powder, 5-10 parts of sodium sulfate and 0.05-0.2 parts of triterpenoid saponin; the lithium slag powder needs to be pre-treated by high-temperature calcination before use; and the phosphorus slag powder needs to be pre-treated by high-temperature calcination before use.

2. The alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials according to claim 1, characterized in that: The high temperature calcination pretreatment method of the lithium slag powder is specifically as follows: calcining the lithium slag at 900°C and then grinding it to a fineness of 800 μm. 2 / kg, and the balling rate is above 70%.

3. The alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials according to claim 1, characterized in that: The high temperature calcination pretreatment method of the phosphorus slag powder is specifically as follows: the phosphorus slag, quartz sand and natural natron are uniformly mixed, calcined at high temperature to a molten state, and then rapidly cooled and ground to a fineness of 400 μm. 2 / kg.

4. The alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials according to claim 3, characterized in that: The mass ratio of the phosphorus slag powder, quartz sand and natural natron is 20:1:0.

5.

5. A method for preparing an alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials as claimed in any one of claims 1 to 4, characterized in that: The method comprises the following steps: weighing raw materials according to mass, mixing pretreated lithium slag powder and phosphorus slag powder with silicon powder, sodium sulfate and triterpenoid saponin, and stirring evenly.

6. A common concrete with alkali-aggregate inhibitor, characterized in that: The alkali aggregate inhibitor based on lithium slag, phosphorus slag and other solid waste materials as claimed in any one of claims 1 to 4 is used to replace 10-20wt% of cement.

7. The ordinary concrete added with alkali-aggregate inhibitor according to claim 6, characterized in that: The ordinary concrete comprises the following raw materials in parts by weight: 14-16 parts of cement, 1-4 parts of alkali aggregate inhibitor, 30 parts of artificial sand, 45 parts of gravel and 7.5 parts of water.

8. The ordinary concrete added with alkali-aggregate inhibitor according to claim 7, characterized in that: The artificial sand has alkali activity, the alkali activity aggregate accounts for 3.2% of the mass percentage of the artificial sand, and the fineness modulus is 2.

8.

9. The ordinary concrete added with alkali-aggregate inhibitor according to claim 7, characterized in that: The stones include stones with particle sizes of 5-10 mm, 10-16 mm and 16-20 mm, and the mass ratio of the three is 1:1:

1.

10. A method for preparing ordinary concrete added with an alkali-aggregate inhibitor as claimed in any one of claims 6 to 9, characterized in that: The method comprises the following steps: weighing raw materials according to mass, mixing cement, alkali aggregate inhibitor, artificial sand, gravel and water, and stirring to obtain ordinary concrete.

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