Coal-based solid waste-based cementitious material mix proportion design method and system

Abstract

The present application relates to a kind of coal-based solid waste-based cementitious material mix design method and system, belong to building material technical field.The present application method includes: (1) establishing coal-based solid waste-based cementitious material test database;(2) according to target working performance, match test database to obtain several test mix proportions;(3) according to vitreous body content and the difference of each raw material activity index jointly correct the amount of corresponding raw material in each test mix proportion, obtain corresponding modified mix proportion;(4) according to modified mix proportion and curing condition, sample preparation and curing are carried out, obtain test coal-based solid waste-based cementitious material and carry out working performance test;(5) screen out the modified mix proportion corresponding to the target working performance, then obtain the most suitable modified mix proportion by raw material configuration and economic analysis.The present application can design mix proportion according to the change of raw material and demand performance in actual engineering, ensure that the working performance of material meets the engineering demand and economic requirement.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of concrete building materials, and particularly relates to a coal-based solid waste-based cementitious material mix proportion design method and system. BACKGROUND

[0002] The information disclosed in this Background section is for the purpose of generally presenting the context of the application. The information disclosed in this Background section is not to be taken as an admission that it is prior art presented by nature of anticipation of the present application and is distinct from the general knowledge of those working in the field.

[0003] Coal occupies a dominant position in energy production and consumption in China. A large amount of coal-based solid waste, including coal gangue, coal slime, tailings, fly ash, slag, gasification ash, and desulfurization gypsum, is generated during coal mining and consumption. According to statistics, the annual discharge of coal-based solid waste exceeds 1.5 billion tons. The large amount of coal-based solid waste generated and accumulated seriously hinders the ecological environment protection and deep development of China. Large-scale and high-value utilization of coal-based solid waste is the most effective way to alleviate the above problems, and the preparation of coal-based solid waste-based cementitious materials has broad demand and application prospects.

[0004] The base material of the coal-based solid waste-based cementitious material includes one or more of coal gangue, coal slime, tailings, fly ash, slag, gasification ash, and desulfurization gypsum, and in addition, includes alkali activators, water, and additives. The types and mix proportions of the above raw materials significantly affect the workability and engineering performance of the coal-based solid waste-based cementitious material. Therefore, in actual engineering, the material mix proportion needs to be adjusted in a timely manner according to the changes in raw materials, so that the performance of the coal-based solid waste-based cementitious material meets the engineering demand and economic requirement. However, there is currently no mix proportion design method for coal-based solid waste-based cementitious materials, which has become a bottleneck problem restricting the engineering application and large-scale promotion of coal-based solid waste-based cementitious materials. SUMMARY

[0005] Based on the above technical background, the present application aims to provide a design method and system suitable for the mix proportion of coal-based solid waste-based cementitious materials.

[0006] The coal-based solid waste cementitious material referred to in the present invention comprises raw materials including a matrix material, an activator, water and an admixture, wherein the matrix material is coal-based solid waste, such as fly ash, coal gangue and slag. Taking into account the diversity of coal-based solid waste types and combining the current research status at home and abroad, the Ca / Si and Si / Al of the coal-based solid waste system are used to characterize the potential hydration activity of the matrix material. In the following description of the design method, the commonly used activator - sodium silicate solution is used as an example. If there are other feasible activators, the design method provided by the present invention is also applicable. By changing the ratio of each raw material in the cementitious material, the water-solid ratio - curing temperature - curing age and testing its working performance, a corresponding trial mix database is obtained, and the working performance indicators are fluidity and compressive strength.

[0007] Furthermore, the present invention calculates the total content of glass in the coal-based solid waste system, combines the glass content with the activity index difference of each raw material to correct the mix ratio screened out from the trial mix database, and ultimately achieves the performance required by the project while taking into account economic benefits.

[0008] The coal-based solid waste-based cementitious material mix ratio design method provided by the present invention can achieve working performance optimization, raw material change correction, construction demand adjustment and economic optimization, predict the mix ratio that meets specific compressive strength and fluidity, and make targeted adjustments to the mix ratio according to different construction requirements and raw material characteristics, and finally achieve "selecting the best from the best" through economic analysis.

[0009] The method for designing the mix ratio of the coal-based solid waste cementitious material comprises the following steps:

[0010] (1) Changing the raw material ratio, water-solid ratio, curing age, and activator content in the coal-based solid waste-based cementitious materials to obtain corresponding coal-based solid waste-based cementitious materials and testing their working performance, wherein the working performance includes fluidity and compressive strength, and obtaining a trial database corresponding to coal-based solid waste Ca / Si-Si / Al-activator content-water-solid ratio-curing temperature-curing age-working performance;

[0011] (2) According to the target working performance, the trial mix database is matched to obtain several trial mix proportions corresponding to Ca / Si-Si / Al-activator content-water-solid ratio-curing temperature-curing age;

[0012] (3) Calculate the total content of glass in the coal-based solid waste system, and correct the amount of corresponding raw materials in each trial mix ratio based on the difference in glass content and the activity index of each raw material to obtain the corresponding corrected mix ratio;

[0013] (4) Prepare and cure samples according to the modified mix ratio that meets the requirements and its corresponding curing conditions to obtain a trial-mixed coal-based solid waste-based cementitious material and perform working performance tests, including fluidity and compressive strength;

[0014] (5)Screening out the modified mix proportion corresponding to the target working performance, and then obtaining the most suitable modified mix proportion as the final mix proportion through raw material configuration and economic analysis.

[0015] In the step (1), there are the following preferred technical solutions:

[0016] The curing temperature includes 20℃ and 40℃, and the curing days include 3d and 28d;

[0017] At 20℃, the relationship between the compressive strength of the curing time of 3d and the compressive strength of the curing time of 28d is:

[0018] f 28 =Af3+B

[0019] At 40℃, the relationship between the compressive strength of the curing time of 3d and the compressive strength of the curing time of 28d is:

[0020] f 28 =Cf3+D

[0021] Wherein, A, B, C, D are the corresponding regression coefficients.

[0022] The matrix material is coal gangue, fly ash and slag; wherein, the content of coal gangue in the matrix material is 20%, 40%, 60%, 80% and 100%, and the mixing amount ratio of fly ash and slag is 1:1.

[0023] The excitation agent is sodium silicate solution, accounting for 8%-12% of the matrix material (mass ratio).

[0024] The water-solid ratio is 0.5 to 0.8.

[0025] The 28d compressive strength of the coal-based solid waste-based cementitious material is 3-10Mpa, or the fluidity is 160-280mm.

[0026] In the step (2), the screening method of the mix proportion is as follows: within 10% range of the target working performance, the corresponding mix proportion is screened based on the trial mix database determined in the step (1).

[0027] In the step (3), according to the activity index of the cementitious material, the corresponding change coefficient is calculated:

[0028] The difference coefficient of coal gangue is: A C The activity index of the new coal gangue, A C0 The activity index of the coal gangue in the trial mix database;

[0029] The difference coefficient of fly ash is: AF A is the activity index of the new fly ash F0 A is the activity index of the fly ash in the trial mix database;

[0030] The coefficient of variation of the slag is: A S A is the activity index of the new slag S0 A is the activity index of the slag in the trial mix database;

[0031] The coefficient of variation of the vitreous content is: C V C is the total vitreous content of the new matrix material V0 C is the total vitreous content of the matrix material in the trial mix database;

[0032] The corrected compressive strength of the cementitious material is: R f = f l, where f is the compressive strength of the cementitious material in the trial mix database, and l is the variation coefficient of the raw materials considering the vitreous content and the difference in activity index of each raw material.

[0033] The relationship between the water-solid ratio and the compressive strength of the cementitious material is established:

[0034]

[0035] The relationship between the water-solid ratio and the fluidity of the cementitious material is established:

[0036] F = a(W / S) + b

[0037] Where a, b, c, and d are the corresponding regression coefficients.

[0038] The water-solid ratio of the cementitious material is calculated according to the above equation:

[0039] Where,

[0040] The changed water-solid ratio of the cementitious material is:

[0041] f' is the 28d compressive strength of the new cementitious material, and F' is the fluidity of the new cementitious material;

[0042] The corrected water requirement W' of the cementitious material is obtained.

[0043] The trial mix proportion is adjusted according to the corrected compressive strength and the corrected water requirement of the cementitious material, and the corrected mix proportion is obtained.

[0044] In the above step (5), if all the trial coal-based solid waste-based cementitious materials after correction do not meet the target working performance, return to step (3) to fine-tune the corrected mix proportion until the trial coal-based solid waste-based cementitious material meets the target working performance.

[0045] The beneficial effects that can be achieved by the above design method are as follows:

[0046] Working performance is preferably adjusted: the water-solid ratio, curing age, activator content, and raw material ratio are adjusted to obtain the required compressive strength and fluidity ratio. If the compressive strength meets the requirements but the fluidity does not meet the requirements, the fluidity of the material is changed by adjusting the amount of additive, and the compressive strength is kept stable by fine-tuning the raw material ratio, and finally the ratio that meets both performance requirements is obtained; if the fluidity meets the requirements but the compressive strength does not meet the requirements, the compressive strength of the material is changed by adjusting the raw material ratio and the activator content, and the fluidity is kept stable by fine-tuning the amount of additive, and finally the ratio that meets both performance requirements is obtained.

[0047] Raw material change correction: the influence of material change on the compressive strength and fluidity of coal-based solid waste-based cementitious material is predicted through mix proportion test. The two important indicators for measuring the potential hydration activity of solid waste are used to correct the raw material change, including the glass content and the raw material activity index. The raw material ratio is adjusted by the above two indicators to meet the requirements of the original mix proportion test, and the change of working performance caused by the change of raw materials is minimized.

[0048] Construction demand adjustment: the coal-based solid waste-based cementitious material is adjusted for construction demand from the following two aspects.(1) For the coal-based solid waste raw materials easily available near the construction site, analyze their physical and chemical properties and potential hydration activity, and adjust the test mix ratio; (2) According to the performance required by the project, the mix ratio of the coal-based solid waste-based cementitious material is selected.

[0049] Economic optimization: on the basis that the coal-based solid waste-based cementitious material meets the required compressive strength and fluidity of the project, the optimal mix ratio is selected by comparing different cementitious material combinations through economic analysis, and the economic benefits are considered on the premise that the material working performance meets the engineering demand.

[0050] The present application also provides a coal-based solid waste-based cementitious material mix ratio design system, which applies the above design method to realize the selection of the mix ratio, and the system comprises:

[0051] A database module for storing a test mix database of coal-based solid waste-based cementitious material;

[0052] An input module for inputting the target compressive strength and fluidity required after the matrix material change, and the compressive strength and fluidity of the test coal-based solid waste-based cementitious material;

[0053] A screening module comprising a matching function, a correction function and a screening function;

[0054] The matching function is used to match the test database according to the target working performance required after the change of the cementitious material, so as to obtain the test matching ratio corresponding to the Ca / Si-Si / Al-stimulant content-water solid ratio-curing temperature-curing age-working performance and curing condition;

[0055] The correction module corrects the amount of the corresponding raw material in the test matching ratio according to the vitreous content and the difference between the activity indexes of the raw materials, so as to obtain the corresponding corrected matching ratio;

[0056] The screening module screens out the corrected matching ratio of the test coal-based solid waste-based cementitious material whose working performance meets the target working performance, and then obtains the most suitable corrected matching ratio as the final matching ratio through raw material configuration and economic analysis.

[0057] The output module is used to output the matching ratio of the coal-based solid waste-based cementitious material after the change of the target compressive strength and fluidity of the base material. BRIEF DESCRIPTION OF DRAWINGS

[0058] The drawings constituting a part of the specification of the present application are used to provide a further understanding of the present application, and the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application.

[0059] Figure 1 is a flow chart of the coal-based solid waste-based cementitious material matching ratio design method of the embodiment;

[0060] Figure 2 is a framework diagram of the coal-based solid waste-based cementitious material matching ratio design system of the embodiment;

[0061] Figure 3 is a micro-electron microscope scanning diagram of the coal-based solid waste-based cementitious material of the embodiment;

[0062] Figure 4 is a micro-electron microscope scanning diagram of the coal-based solid waste-based cementitious material of the embodiment from another perspective. DETAILED DESCRIPTION

[0063] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0064] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0065] In order to enable a person skilled in the art to more clearly understand the technical solutions of the present application, the technical solutions of the present application will be described in detail below in combination with specific examples.

[0066] As shown in Figure 1 The present application provides a coal-based solid waste-based cementitious material mixing ratio design method, which comprises the following steps:

[0067] The raw materials of the coal-based solid waste-based cementitious material include a base material, an activator, water and an additive; the base material includes coal-based solid waste fly ash, coal gangue and slag; the activator is a sodium silicate solution;

[0068] (1) Establish a coal-based solid waste-based cementitious material trial mixing database

[0069] The Ca / Si and Si / Al of the coal-based solid waste system are used to characterize the potential hydration activity of the base material, the raw material mixing ratio, the water-solid ratio, the curing age, and the activator content of the coal-based solid waste-based cementitious material are changed, the corresponding coal-based solid waste-based cementitious material is obtained, and its working performance, including the fluidity and the compressive strength, is tested, to obtain a trial mixing database corresponding to the coal-based solid waste Ca / Si-Si / Al-activator content-water-solid ratio-curing temperature-curing age-working performance;

[0070] Specifically, the coal gangue content in the coal-based solid waste-based cementitious material in the trial mixing database includes 20%, 40%, 60%, 80% and 100%;

[0071] The mixing amount ratio of fly ash and slag in the coal-based solid waste-based cementitious material in the trial mixing database is 1:1;

[0072] The sodium silicate solution in the coal-based solid waste-based cementitious material in the trial mixing database accounts for 8%-12% of the mass ratio of the base material;

[0073] The water-solid ratio of the coal-based solid waste-based cementitious material in the trial mixing database is between 0.5 and 0.8;

[0074] The 28d compressive strength of the coal-based solid waste-based cementitious material in the trial mixing database ranges from 3 to 10 MPa;

[0075] The fluidity of the coal-based solid waste-based cementitious material in the trial mixing database ranges from 160 to 280 mm.

[0076] Table 1 Coal-based solid waste-based cementitious material trial mix proportion

[0077]

[0078]

[0079]

[0080]

[0081]

[0082] In addition, for the curing conditions of the above-mentioned mix proportions: the curing temperature includes 20℃ and 40℃, and the curing days include 3d and 28d;

[0083] At 20℃, the relationship between the compressive strength of the curing time of 3d and the compressive strength of the curing time of 28d is:

[0084] f 28 = Af3+ B

[0085] At 40℃, the relationship between the compressive strength of the curing time of 3d and the compressive strength of the curing time of 28d is:

[0086] f 28 = Cf3+ D

[0087] Wherein, A, B, C, D are the corresponding regression coefficients.

[0088] (2) According to the target working performance, match the trial mix database to obtain several trial mix proportions corresponding to Ca / Si-Si / Al-stimulant content-water solid ratio-curing temperature-curing age;

[0089] Specifically, the target working performance is the design performance to be achieved after the matrix material changes, and the matching trial mix database is determined within 10% range above and below the target working performance. For example, if the mix proportion with compressive strength of 5MPa and fluidity of 220mm is needed, several mix proportions with strength of 4.5-5.5MPa and fluidity of 198mm-242mm are selected in the database for subsequent screening work.

[0090] (3) Calculate the total content of coal-based solid waste system glass body, and correct the amount of corresponding raw materials in each trial mix proportion according to the difference between the glass body content and the activity index of each raw material, to obtain the corresponding corrected mix proportion;

[0091] Specifically, according to the activity index of each raw material and the total glass body content, the corresponding difference coefficient is calculated:

[0092] The coefficient of variation of coal gangue: A C A is the activity index of the new coal gangue, C0 A is the activity index of the coal gangue in the trial mix database;

[0093] The coefficient of variation of fly ash: A F A is the activity index of the new fly ash, F0 A is the activity index of the fly ash in the trial mix database;

[0094] The coefficient of variation of slag: A S A is the activity index of the new slag, S0 A is the activity index of the slag in the trial mix database;

[0095] The coefficient of variation of vitreous content: C V C is the total vitreous content of the new matrix material, V0 C is the total vitreous content of the matrix material in the trial mix database;

[0096] The corrected compressive strength of the cementitious material is: f R = fλ, f is the compressive strength of the cementitious material in the trial mix database, and λ is the variation coefficient considering the vitreous content of the raw materials and the difference in activity index of each raw material.

[0097] Establish the relationship between the water-solid ratio and the compressive strength of the cementitious material:

[0098]

[0099] Establish the relationship between the water-solid ratio and the fluidity of the cementitious material:

[0100] F = c(W / S) + d

[0101] Wherein, a, b, c, d are the corresponding regression coefficients.

[0102] Calculate the water-solid ratio of the cementitious material according to the above equation:

[0103] Wherein,

[0104] The changed water-solid ratio of the cementitious material is:

[0105] f' is the 28d compressive strength of the new cementitious material, and F' is the fluidity of the new cementitious material;

[0106] Get the changed corrected water requirement W' of the cementitious material;

[0107] According to the modified compressive strength and the modified water requirement adjustment of the cementitious material, the modified mixture ratio is obtained.

[0108] (4) According to the modified mixture ratio meeting the conditions and the corresponding curing conditions, sample preparation and curing are carried out to obtain the trial coal-based solid waste-based cementitious material and perform working performance test, including fluidity and compressive strength;

[0109] Specifically, the curing conditions corresponding to the modified mixture ratio reflect the curing conditions of the trial mixture ratio before modification; it is required to find the fitting relationship of curing temperature-curing age-compressive strength in the database, and the corresponding curing temperature and curing age are compared, and the sample preparation and curing of the modified multiple mixture ratios are carried out to obtain the trial coal-based solid waste-based cementitious material and perform working performance test.

[0110] (5) The modified mixture ratio corresponding to the working performance of the trial coal-based solid waste-based cementitious material meeting the target working performance is selected, and the most suitable modified mixture ratio is obtained as the final mixture ratio through raw material configuration and economic analysis.

[0111] Specifically, if the working performance of the multiple trial coal-based solid waste-based cementitious materials meets the engineering requirements, that is, the mechanical properties and fluidity are within the target range, the most economical one of the multiple modified mixture ratios is selected for actual engineering, and if the working performance of the trial coal-based solid waste-based cementitious material does not meet the engineering requirements, the modified mixture ratio is adjusted, and steps (4) and (5) are repeated until the required working performance value is obtained.

[0112] The application also provides a coal-based solid waste-based cementitious material mixture ratio design system, which applies the coal-based solid waste-based cementitious material mixture ratio design method according to any one of the above solutions. Figure 2 As shown in the figure, the mixture ratio design system comprises:

[0113] A database module is used to store the trial database of the coal-based solid waste-based cementitious material.

[0114] Specifically, the raw materials of the coal-based solid waste-based cementitious material include matrix material, activator, water and additive, and commonly used coal-based solid waste fly ash, coal gangue and slag are used as the matrix material, the activator is sodium silicate solution, the raw material ratio, water-solid ratio, curing age, activator content in the coal-based solid waste-based cementitious material are changed, the corresponding coal-based solid waste-based cementitious material is obtained and its working performance is tested, the working performance includes fluidity and compressive strength, and the trial database corresponding to the coal-based solid waste Ca / Si-Si / Al-activator content-water-solid ratio-curing temperature-curing age-working performance is obtained.

[0115] Specifically, the content of coal gangue in the coal-based solid waste-based cementitious material in the trial database includes 20%, 40%, 60%, 80%, and 100%;

[0116] The mixing amount ratio of fly ash and slag in the coal-based solid waste-based cementitious material in the trial database is 1:1;

[0117] The content of sodium silicate solution in the coal-based solid waste-based cementitious material in the trial database accounts for 8%-12% of the mass of the base material;

[0118] The water-solid ratio of the coal-based solid waste-based cementitious material in the trial database is between 0.5 and 0.8;

[0119] The 28d compressive strength of the coal-based solid waste-based cementitious material in the trial database ranges from 3 to 10 MPa;

[0120] The fluidity of the coal-based solid waste-based cementitious material in the trial database ranges from 160 to 280 mm;

[0121] In addition, for the curing conditions of the above mixing ratio: the curing temperature includes 20℃ and 40℃, and the curing days include 3d and 28d;

[0122] At 20℃, the relationship between the compressive strength of the curing time of 3d and the compressive strength of the curing time of 28d is:

[0123] f 28 =Af3+B

[0124] At 40℃, the relationship between the compressive strength of the curing time of 3d and the compressive strength of the curing time of 28d is:

[0125] f 28 =Cf3+D

[0126] Wherein, A, B, C, D are the corresponding regression coefficients.

[0127] The input module is used to input the target compressive strength, fluidity and compressive strength and fluidity of the trial coal-based solid waste-based cementitious material required after the change of the base material;

[0128] The screening module includes a matching function, a correction function and a screening function;

[0129] The matching module is used to match the trial database according to the target compressive strength required after the change of the cementitious material to obtain the trial mixing ratio and curing condition corresponding to Ca / Si-Si / Al-stimulant content-water-solid ratio-curing temperature-curing age-working performance;

[0130] The correction module corrects the amount of each raw material in each trial mixing ratio according to the glass content and the difference in activity index of each raw material to obtain the corresponding corrected mixing ratio.

[0131] Specifically, the difference coefficient corresponding to each raw material is calculated according to the activity index and the total glass content of the raw material:

[0132] Difference coefficient of coal gangue: A C is the activity index of the new coal gangue, A C0 is the activity index of the coal gangue in the trial database;

[0133] Difference coefficient of fly ash: A F is the activity index of the new fly ash, A F0 is the activity index of the fly ash in the trial database;

[0134] Difference coefficient of slag: A S is the activity index of the new slag, A S0 is the activity index of the slag in the trial database;

[0135] Difference coefficient of glass content: C V is the total glass content of the new matrix material, C V0 is the total glass content of the matrix material in the trial database;

[0136] The corrected compressive strength of the cementitious material is: f R = fλ, f is the compressive strength of the cementitious material in the trial database, and λ is the variation coefficient of the raw material considering the difference between the glass content and the activity index of each raw material.

[0137] The relationship between the water-solid ratio and the compressive strength of the cementitious material is established:

[0138]

[0139] The relationship between the water-solid ratio and the fluidity of the cementitious material is established:

[0140] F = c(W / S) + d

[0141] Wherein, a, b, c, d are the corresponding regression coefficients.

[0142] The water-solid ratio of the cementitious material is calculated according to the above equation:

[0143] Wherein,

[0144] The changed water-solid ratio of the cementitious material is:

[0145] f’ is the 28d compressive strength of the new cementitious material, and F’ is the fluidity of the new cementitious material.

[0146] Obtain the corrected water requirement W' of the cementitious material after the change;

[0147] Adjust the trial mix proportion according to the corrected compressive strength and the corrected water requirement of the cementitious material, and obtain the corrected mix proportion.

[0148] The screening module screens the corresponding corrected mix proportion according to the set working performance, and then obtains the most suitable corrected mix proportion as the final mix proportion through raw material configuration and economic analysis;

[0149] Specifically, if the working performance of the obtained multiple trial coal-based solid waste-based cementitious materials meets the engineering requirements, that is, the mechanical properties and the fluidity are both within the target range, the most economical one of the multiple corrected mix proportions is selected for actual engineering; if the working performance of the trial coal-based solid waste-based cementitious materials does not meet the engineering requirements, the corrected mix proportion is adjusted, and steps (4) and (5) are repeated until the required working performance value is obtained.

[0150] The output module is configured to output the mix proportion of the coal-based solid waste-based cementitious material required to reach the target compressive strength and fluidity after the change of the matrix material.

[0151] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for designing a mix ratio of coal-based solid waste cementitious materials, characterized in that: The raw materials of the coal-based solid waste gelling material include a base material, an activator, water and an admixture, wherein the base material is fly ash, coal gangue and slag, and the activator is a sodium silicate solution; The method for designing the mix ratio of the coal-based solid waste cementitious material comprises the following steps: (1) Changing the raw material ratio, water-solid ratio, curing age, and activator content in the coal-based solid waste-based cementitious materials to obtain corresponding coal-based solid waste-based cementitious materials and testing their working performance, wherein the working performance includes fluidity and compressive strength, and obtaining a trial database corresponding to coal-based solid waste Ca / Si-Si / Al-activator content-water-solid ratio-curing temperature-curing age-working performance; (2) According to the target working performance, the trial mix database is matched to obtain several trial mix proportions corresponding to Ca / Si-Si / Al-activator content-water-solid ratio-curing temperature-curing age; (3) Calculate the total content of glass in the coal-based solid waste system, and correct the amount of corresponding raw materials in each trial mix ratio based on the difference in glass content and the activity index of each raw material to obtain the corresponding corrected mix ratio; In step (3), the corresponding coefficient of variation is calculated based on the activity index of the gelling material: Coefficient of variation of coal gangue: A C is the activity index of new coal gangue, A C0 is the activity index of the coal gangue in the trial database; Coefficient of variation of fly ash: A F is the activity index of new fly ash, A F0 is the activity index of fly ash in the trial database; Slag variation coefficient: A S is the activity index of the new slag, A S0 is the activity index of the slag in the trial database; Coefficient of variation of vitreous content: C V is the total glass content of the new matrix material, C V0 is the total glass content of the matrix material in the trial preparation database; The modified compressive strength of cementitious materials is: f R =fλ, where f is the compressive strength of the cementitious materials in the trial database, and λ is the coefficient of variation of the raw materials considering the difference in vitreous content and the activity index of each raw material; Establish the relationship between the water-to-solid ratio and compressive strength of cementitious materials: Establish the relationship between the water-solid ratio and fluidity of cementitious materials: F=c(W / S)+d Among them, a, b, c, and d are the corresponding regression coefficients; The water-solid ratio of the cementitious material is calculated according to the above equation: in, The water-solid ratio of the cementitious material after the change is: f' 28 is the 28d compressive strength of the new cementitious material, and F' is the fluidity of the new cementitious material; Obtain the corrected water demand W' after the change of cementitious materials; Adjust the trial mix ratio according to the modified compressive strength and modified water requirement of the cementitious material to obtain the modified mix ratio; (4) Prepare and cure samples according to the modified mix ratio that meets the requirements and its corresponding curing conditions to obtain a trial-mixed coal-based solid waste-based cementitious material and perform working performance tests, including fluidity and compressive strength; (5) Screen out the modified mix ratio that meets the target working performance, and then obtain the most appropriate modified mix ratio as the final mix ratio through raw material configuration and economic analysis.

2. The method for designing a mix ratio of coal-based solid waste cementitious materials according to claim 1, wherein: In step (1), the curing temperature includes 20°C and 40°C, and the curing days include 3d and 28d; At 20°C, the relationship between the compressive strength after a curing time of 3 days and the compressive strength after a curing time of 28 days is: f 28 =Af3+B At 40°C, the relationship between the compressive strength after a curing time of 3 days and the compressive strength after a curing time of 28 days is: f 28 =Cf3+D Among them, A, B, C, and D are the corresponding regression coefficients.

3. The method for designing a mix ratio of coal-based solid waste cementitious materials according to claim 1, wherein: In step (1), the content of coal gangue in the matrix material is 20%, 40%, 60%, 80% and 100%, and the mixing ratio of fly ash and slag is 1:

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4. The method for designing a mix ratio of coal-based solid waste cementitious materials according to claim 1, wherein: In step (1), the sodium silicate solution accounts for 8%-12% of the mass of the matrix material.

5. The method for designing a mix ratio of coal-based solid waste cementitious materials according to claim 1, wherein: The water-to-solid ratio is 0.5 to 0.

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6. The method for designing a mix ratio of coal-based solid waste cementitious materials according to claim 1, wherein: In step (1), the 28d compressive strength of the coal-based solid waste-based cementitious material is 3-10 MPa, or the fluidity is 160-280 mm.

7. The method for designing a mix ratio of coal-based solid waste cementitious materials according to claim 1, wherein: In step (2), the method for screening the mix ratio is as follows: within a range of 10% above and below the target working performance, the corresponding mix ratio is screened based on the trial mix database determined in step (1).

8. The method for designing a mix ratio of coal-based solid waste cementitious materials according to claim 1, wherein: In step (5), if all trial-mixed coal-based solid waste-based cementitious materials fail to achieve the target working performance after correction, return to step (3) to fine-tune the corrected mix ratio until the trial-mixed coal-based solid waste-based cementitious materials achieve the target working performance.

9. A coal-based solid waste-based cementitious material mix ratio design system, characterized in that: The system applies the design method according to any one of claims 1 to 8 to implement the screening of the mix ratio, and the system comprises: Database module, used to store the trial mix database of coal-based solid waste-based cementitious materials; An input module is used to input the target compressive strength and fluidity to be achieved after the base material is changed, and the compressive strength and fluidity of the trial-mixed coal-based solid waste-based cementitious material; Screening module, including matching function, correction function and screening function; The matching function is used to match the trial mix database according to the target compressive strength and fluidity to obtain the trial mix ratio and curing conditions corresponding to Ca / Si-Si / Al-activator content-water-solid ratio-curing temperature-curing age-workability; The correction module jointly corrects the amount of corresponding raw materials in each trial mix ratio according to the difference in vitreous content and the activity index of each raw material to obtain the corresponding corrected mix ratio; The screening module selects the modified mix ratio of the trial-mixed coal-based solid waste-based cementitious materials whose working performance meets the target working performance, and then obtains the most appropriate modified mix ratio as the final mix ratio through raw material configuration and economic analysis; The output module is used to output the mix ratio of coal-based solid waste-based cementitious materials that need to achieve the target compressive strength and fluidity after the base material is changed.

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