Method for quantifying the competition of water-reducing agents for adsorption by regenerated fines and cement

Abstract

The application discloses a method for quantifying the competitive adsorption of recycled micro-powder and cement on water-reducing agent, comprising: obtaining the phase composition of recycled micro-powder and the mass fraction of each phase composition; determining the adsorption behavior of water-reducing agent in pure cement, single-component paste of pure phase composition and double-component paste of coexisting cement and pure phase composition; constructing a double-component paste water-reducing agent total adsorption amount calculation model containing adsorption weight; establishing a competitive adsorption coefficient calculation model of each phase composition; establishing a recycled micro-powder competitive adsorption coefficient calculation model; and outputting the competitive adsorption coefficient as a quantitative parameter for representing the competitive adsorption strength of water-reducing agent in a recycled micro-powder-cement system. The application can effectively calculate the competitive adsorption strength of water-reducing agent under different mineral compositions and recycled micro-powder contents, the competitive adsorption coefficient has high repeatability, provides a reliable quantitative basis for accurately regulating the water-reducing agent content in cement-based materials containing recycled micro-powder, and helps the high-value utilization of building solid waste resources and the development of low-carbon cement-based materials.

Description

Technical Field

[0001] This invention relates to the field of competitive adsorption technology of water-reducing agents by quantitatively recycled micro powder and cement, and particularly to a method for competitive adsorption of water-reducing agents by quantitatively recycled micro powder and cement. Background Technology

[0002] Recycled micro powder is a byproduct with a particle size of less than 75μm produced during the preparation of recycled coarse and fine aggregates from waste concrete. It is mainly composed of limestone, quartz, hardened cement paste, etc. It is characterized by large output, wide sources, and large fluctuations in phase composition, and is widely used in the preparation of cement-based materials such as recycled concrete or recycled mortar.

[0003] However, the incorporation of recycled micro-powder leads to decreased fluidity and increased loss of flowability in fresh cement paste. Furthermore, due to the varying mineral composition of recycled micro-powder, there is no consistent conclusion regarding its impact on the performance of fresh cement paste. This is mainly because the adsorption capacity, adsorption rate, and mechanism of action of different phase components in recycled micro-powder for water-reducing agents differ significantly. Therefore, there is a clear competitive adsorption effect between recycled micro-powder and cement for water-reducing agents, resulting in uneven distribution of the water-reducing agent on the surfaces of both recycled micro-powder and cement particles, further exacerbating the complexity of the rheological behavior of the recycled micro-powder-cement paste.

[0004] Currently, there is no method to quantify the competitive adsorption of water-reducing agents. Traditional adsorption capacity testing methods (such as total organic carbon method and ultraviolet spectrophotometry) can only obtain the total adsorption of the entire system and it is difficult to distinguish the adsorption contribution ratio of each solid component. Although molecular dynamics simulation can reveal the microscopic adsorption mechanism, the computational cost is high and it is difficult to directly correlate with the macroscopic rheological properties. Slurry rheological testing can reflect the final macroscopic workability, but it is difficult to decouple the key intermediate process of competitive adsorption.

[0005] Therefore, existing studies usually ignore the competitive adsorption behavior of water-reducing agent molecules between different solid phases in the recycled micro powder-cement composite system. They assume that the total adsorption amount of water-reducing agent in the recycled micro powder-cement system can be estimated by simply linearly weighting the mass fractions of recycled micro powder and cement. However, this will make the relationship between the rheological properties of the recycled micro powder-cement paste and the amount of recycled micro powder unreliable.

[0006] Therefore, in order to solve the problems existing in the prior art, a method for quantifying the competitive adsorption of water-reducing agents by recycled micro powder and cement is provided. This method is used to accurately characterize the strength of the competitive adsorption effect of water-reducing agents in the recycled micro powder-cement system and its influence on rheological properties. This is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the present invention provides a method for quantifying the competitive adsorption of water-reducing agents by recycled micro powder and cement.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A method for quantifying the competitive adsorption of water-reducing agents by recycled micropowder and cement includes the following steps: (1) Obtaining the phase composition of the regenerated micro powder and each phase component mass parts f i ; (2) Under consistent test conditions, pure cement and pure components with different water-reducing agent dosages were prepared respectively. Single-component slurries and slurries with different water-reducing agent dosages and components Cement admixture and components Coexisting two-component slurry; (3) The water-reducing agent equilibrium adsorption test was performed on the single-component slurry and the two-component slurry to obtain cement and components. Water-reducing agent saturated adsorption capacity , Adsorption equilibrium constant k and total adsorption amount of water-reducing agent in two-component slurry ; (4) Establish the following including adsorption weights Calculation model for total adsorption capacity of two-component slurry: ; in, Components Or cement, for The relative adsorption weight of the water-reducing agent In a two-component slurry Phase mass fraction and water-reducing agent dosage C and The functional relationship that is satisfied; (5) Establish components competitive adsorption coefficient Computational model: ; in, To the regenerated micro powder phase composition The competitive adsorption coefficient, which is defined as the component in a binary slurry... The normalized adsorption weight relative to cement, Regenerated micro powder phase components The adsorption weight of water-reducing agents The adsorption weight of cement for water-reducing agents, Components quality score and water-reducing agent dosage C and The functional relationship that is satisfied; (6) Calculate the competitive adsorption coefficient of the regenerated micro powder by establishing the following model or a weighted model that is physically equivalent to it. : ; Among them, f i The components of each phase Mass fraction of the recycled micro powder It is a component The competitive adsorption coefficient; (7) Output As a quantitative parameter characterizing the competitive adsorption intensity and non-uniform distribution of water-reducing agents in the recycled micro-powder-cement system.

[0009] Preferably, in step (1), the phase components of the regenerated micro powder Including but not limited to limestone component LSP, quartz component QZP, and hardened cement paste component HPP.

[0010] Preferably, in step (2), the water-reducing agent dosage ranges from 0% to 100% of the saturated dosage.

[0011] Preferably, in step (3), the equilibrium adsorption test of the water-reducing agent is performed using the TOC method, and the cement and components... Water-reducing agent saturated adsorption capacity and The following Langmuir monolayer adsorption model was fitted: ; in, This refers to the amount of water-reducing agent adsorbed on solid particles. This represents the concentration of the water-reducing agent in the pore solution under adsorption equilibrium conditions. denoted as saturated adsorption capacity of the water-reducing agent on solid particles, and K as the adsorption equilibrium constant.

[0012] Preferably, in step (4), The specific model is as follows: ; in, It represents any phase in LSP, QZP, HPP, or cement. yes Phase mass fraction, yes The relative saturated adsorption capacity of the water-reducing agent yes The adsorption equilibrium constant of the phase, where C is the water-reducing agent dosage. The heterogeneity factor is calculated based on the Sips model fitting. Is the mass fraction of phase j and The absolute value of the quadratic coefficient in a quadratic equation that satisfies the given conditions.

[0013] Preferably, in step (5), The specific model is as follows: ; ; ; in, It is the mass fraction of the limestone component. It is the mass fraction of the quartz component. C is the mass fraction of the hardened cement paste components, and C is the dosage of water-reducing agent.

[0014] Preferably, in step (6), the specific calculation model for the competitive adsorption coefficient of the regenerated micropowder is as follows: ; in, It is the mass fraction of limestone components in the recycled micro powder. It is the mass fraction of quartz component in the regenerated micro powder. It is the mass fraction of the hardened cement paste component in the recycled powder, and The rest are trace impurities, which can be ignored.

[0015] Preferably, the limestone component in the recycled micro powder is derived from the coarse aggregate phase of the parent concrete; the quartz component is derived from the fine aggregate phase of the parent concrete; and the hardened cement paste component is derived from the hardened cement paste phase of the parent concrete.

[0016] Preferably, the Phase mass fraction The value range is (0,1); the component quality score The value range is (0%, 100%); the water-reducing agent dosage C ranges from (0, +∞).

[0017] The present invention achieves the following technical effects compared to the prior art: 1) This invention obtains results through a standardized testing-calculation process. The study quantitatively characterized the non-uniform distribution characteristics of water-reducing agents in a multi-component cementitious system (cement-recycled micro powder composite system), revealed the differences in the adsorption capacity of recycled micro powder mineral components (hardened cement paste, quartz, limestone, etc.) for water-reducing agent molecules, and achieved accurate evaluation of the effective concentration of water-reducing agents. 2) The competitive adsorption coefficient of the water-reducing agent obtained by this invention It can be directly used as the core input to establish an adaptive control model for water-reducing agent dosage and a performance control system for recycled micro powder-cement composite paste, effectively improving the proportion of recycled micro powder in high-performance cement-based materials and the efficiency of resource utilization. 3) Competitive adsorption coefficient The influence of the fluctuation of recycled micro powder mineral composition on the distribution of water-reducing agent is transformed into a visible parameter, reducing the reliance on empirical judgment and realizing real-time optimization of admixture dosage based on batch of recycled micro powder, thereby improving the stability and controllability of slurry fluidity and construction performance. 4) The test-calculation method proposed in this invention has a high degree of standardization and good repeatability. It can be directly applied to the existing cement-based material production and quality testing system, which significantly reduces the technical threshold and test cost of recycled micro powder application and promotes the large-scale and high-value utilization of recycled micro powder in green and low-carbon concrete. Attached Figure Description

[0018] Figure 1 This is an overall flowchart of the method for competitive adsorption of water-reducing agents by quantitatively recycled micro powder and cement as described in this invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention discloses a method for quantifying the competitive adsorption of water-reducing agents by recycled micropowder and cement, comprising the following steps: (1) Obtaining the phase composition of the regenerated micro powder and each phase component mass parts f i ; (2) Under consistent test conditions, pure cement and pure components with different water-reducing agent dosages were prepared respectively. Single-component slurries and slurries with different water-reducing agent dosages and components Cement admixture and components Coexisting two-component slurry; (3) The water-reducing agent equilibrium adsorption test was performed on the single-component slurry and the two-component slurry to obtain cement and components. Water-reducing agent saturated adsorption capacity , Adsorption equilibrium constant k and total adsorption amount of water-reducing agent in two-component slurry ; (4) Establish the following including adsorption weights Calculation model for total adsorption capacity of two-component slurry: ; in, Components Or cement, for The relative adsorption weight of the water-reducing agent In a two-component slurry Phase mass fraction and water-reducing agent dosage C and The functional relationship that is satisfied; (5) Establish components competitive adsorption coefficient Computational model: ; in, Regenerated micro powder phase components The competitive adsorption coefficient, which is defined as the component in a binary slurry... The normalized adsorption weight relative to cement, Regenerated micro powder phase components The adsorption weight of water-reducing agents The adsorption weight of cement for water-reducing agents, Components quality score and water-reducing agent dosage C and The functional relationship that is satisfied; (6) Calculate the competitive adsorption coefficient of the regenerated micro powder by establishing the following model or a weighted model that is physically equivalent to it. : ; Among them, f i The components of each phase Mass fraction of the recycled micro powder It is a component The competitive adsorption coefficient; (7) Output As a quantitative parameter characterizing the competitive adsorption intensity and non-uniform distribution of water-reducing agents in the recycled micro-powder-cement system.

[0021] In step (1), the phase components of the regenerated micro powder Including but not limited to limestone component LSP, quartz component QZP, and hardened cement paste component HPP.

[0022] In step (2), the dosage of water-reducing agent is 0 to 100% of the saturated dosage.

[0023] In step (3), the equilibrium adsorption test of the water-reducing agent was conducted using the TOC method, and the cement and components... Water-reducing agent saturated adsorption capacity and The following Langmuir monolayer adsorption model was fitted: ; in, This refers to the amount of water-reducing agent adsorbed on solid particles. This represents the concentration of the water-reducing agent in the pore solution under adsorption equilibrium conditions. denoted as saturated adsorption capacity of the water-reducing agent on solid particles, and K as the adsorption equilibrium constant.

[0024] In step (4), The specific model is as follows: ; in, It represents any phase in LSP, QZP, HPP, or cement. yes Phase mass fraction, yes The relative saturated adsorption capacity of the water-reducing agent yes The adsorption equilibrium constant of the phase, where C is the water-reducing agent dosage. The heterogeneity factor is calculated based on the Sips model fitting. Is the mass fraction of phase j and The absolute value of the quadratic coefficient in a quadratic equation that satisfies the given conditions.

[0025] In step (5), The specific model is as follows: ; ; ; in, It is the mass fraction of the limestone component. It is the mass fraction of the quartz component. C is the mass fraction of the hardened cement paste components, and C is the dosage of water-reducing agent.

[0026] In step (6), the specific calculation model for the competitive adsorption coefficient of the regenerated micropowder is as follows: ; in, It is the mass fraction of limestone components in the recycled micro powder. It is the mass fraction of quartz component in the regenerated micro powder. It is the mass fraction of the hardened cement paste component in the recycled powder, and The rest are trace impurities, which can be ignored.

[0027] The limestone component in the recycled micro powder originates from the coarse aggregate phase of the parent concrete; the quartz component originates from the fine aggregate phase of the parent concrete; and the hardened cement paste component originates from the hardened cement paste phase of the parent concrete.

[0028] Phase mass fraction The value range is (0,1); the component quality score The value range is (0%, 100%); the water-reducing agent dosage C ranges from (0, +∞).

[0029] 1. The calculation process is as follows: (1) Obtaining the phase composition of regenerated micro powder (RCP) and each phase component mass parts f i ; The phase composition of RCP1 is shown in Table 1. Table 1: Phase Composition of RCP1

[0030] The phase composition of RCP2 is shown in Table 2. Table 2: Phase Composition of RCP2

[0031] The phase composition of RCP3 is shown in Table 3. Table 3: Phase Composition of RCP3

[0032] (2) Prepared separately under consistent test conditions: Pure cement and pure components with different water-reducing agent dosages A single-component slurry; Among them, pure cement paste and pure components The slurry composition is shown in Table 4; Table 4: Pure cement paste and pure components Mix proportions of slurry

[0033] Different water-reducing agent dosages and components Cement admixture and components Coexisting two-component slurry; Among them, pure components The formulation of the cement paste is shown in Table 5. Table 5: Doping Components The mix proportion of cement paste

[0034] (3) The water-reducing agent equilibrium adsorption test was carried out on the single-component slurry and the two-component slurry to obtain cement and components. Water-reducing agent saturated adsorption capacity , The equilibrium adsorption constant K and the total adsorption amount of water-reducing agent in the two-component slurry ; Among them, cement, components The saturated adsorption capacity and adsorption equilibrium constant are shown in Table 6. Table 6: Cement and Components saturated adsorption capacity and adsorption equilibrium constant

[0035] The total adsorption amount of water-reducing agent in the two-component slurry is shown in Table 7. Table 7: Total Adsorption Capacity of Water-Reducing Agent in Two-Component Slurries

[0036] (4) Based on single components Dosage and water-reducing agent dosage The influence of pure components In slurries containing polycarbonate (PC) or PVC, the water-reducing agent is uniformly adsorbed due to the uniform surface energy of the particles. However, in two-component slurries, the difference in particle surface energy leads to competitive adsorption: high-energy surfaces preferentially adsorb the water-reducing agent, resulting in an adsorption amount higher than the theoretical value of water-reducing agent adsorption in single-component slurries; while low-energy surfaces show reduced adsorption.

[0037] Therefore, the total adsorption capacity of the composite slurry cannot be simply calculated by weighted summation of the adsorption capacity of the water-reducing agent in the pure component slurry. Competitive adsorption must be considered, and an adsorption weighting factor must be introduced. To correct the calculation, the following model is established for calculation. :

[0038] in, yes Phase mass fraction, yes Phase adsorption weighting factor yes K i yes The adsorption equilibrium constant of the phase, where C is the water-reducing agent dosage. The heterogeneity factor is calculated based on the Sips model fitting. yes Phase mass fraction and The absolute value of the quadratic coefficient in a quadratic equation that satisfies the given conditions.

[0039] (5) For the quantification of water-reducing agent in pure components The competitive adsorption between PC and PC is defined by the competitive adsorption coefficient. ,

[0040] in, It is a component The mass fraction of C is the water-reducing agent dosage.

[0041] (6) Since RCP is mainly composed of three components: LSP, QZP, and HPP, the competitive adsorption coefficient of the actual RCP can be calculated by summing the competitive adsorption coefficients of each component: Among them, f i Components The mass fraction in actual RCP, and (The rest are trace impurities and can be ignored).

[0042] 2. Several typical recycled powder-cement cementitious systems Example 1

[0043] A recycled micro-powder-cement binder system, the composition of which is shown in Table 8 below: Table 8: Composition of a Regenerated Micropowder-Cement Slurry

[0044] The quantification of the competitive adsorption of water-reducing agent in this system is carried out according to the above calculation process. Finally, the competitive adsorption coefficient of regenerated micro powder in this system is calculated by the formula in step (6). .

[0045] Example 2: A recycled micro-powder-cement binder system, the composition of which is shown in Table 9 below: Table 9: Composition of a Regenerated Micropowder-Cement Slurry

[0046] The quantification of the competitive adsorption of water-reducing agent in this system is carried out according to the above calculation process. Finally, the competitive adsorption coefficient of regenerated micro powder in this system is calculated by the formula in step (6). .

[0047] Example 3: A recycled micro-powder-cement binder system, the composition of which is shown in Table 10 below: Table 10: Composition of a Regenerated Micropowder-Cement Slurry

[0048] The quantification of the competitive adsorption of water-reducing agent in this system is carried out according to the above calculation process. Finally, the competitive adsorption coefficient of regenerated micro powder in this system is calculated by the formula in step (6). .

[0049] Example 4: A recycled micro-powder-cement binder system, the composition of which is shown in Table 11 below: Table 11: Composition of a Regenerated Micropowder-Cement Slurry

[0050] The quantification of the competitive adsorption of water-reducing agent in this system is carried out according to the above calculation process. Finally, the competitive adsorption coefficient of regenerated micro powder in this system is calculated by the formula in step (6). .

[0051] Example 5: A recycled micro-powder-cement binder system, the composition of which is shown in Table 12 below: Table 12: Composition of a Regenerated Micropowder-Cement Slurry

[0052] The quantification of the competitive adsorption of water-reducing agent in this system is carried out according to the above calculation process. Finally, the competitive adsorption coefficient of regenerated micro powder in this system is calculated by the formula in step (6). .

[0053] Example 6: A recycled micro-powder-cement binder system, the composition of which is shown in Table 13 below: Table 13: Composition of a Regenerated Micropowder-Cement Slurry

[0054] The quantification of the competitive adsorption of water-reducing agent in this system is carried out according to the above calculation process. Finally, the competitive adsorption coefficient of regenerated micro powder in this system is calculated by the formula in step (6). .

[0055] Example 7: A recycled micro-powder-cement binder system, the composition of which is shown in Table 14 below: Table 14: Composition of a Regenerated Micropowder-Cement Slurry

[0056] The quantification of the competitive adsorption of water-reducing agent in this system is carried out according to the above calculation process. Finally, the competitive adsorption coefficient of regenerated micro powder in this system is calculated by the formula in step (6). .

[0057] 3. Competitive adsorption coefficient of water-reducing agent: The competitive adsorption coefficients of the water-reducing agents in the systems of Examples 1-7 were calculated, and the results are shown in Table 15 below: Table 15: Competitive Adsorption Coefficients of Water-Reducing Agents in Examples 1-7

[0058] Note: (1) When the RCP dosage is low, as the proportion of HPP component in RCP increases, The adsorption coefficient of RCP increases significantly, and this increasing trend is even more pronounced with high water-reducing agent dosages. Although the LSP and QZP components have stronger competitive adsorption capabilities, their mass fraction in RCP is low, meaning they can only adsorb a small amount of water-reducing agent, while the porous HPP component can adsorb more. Therefore, under low RCP dosage and high water-reducing agent dosage, the competitive adsorption coefficient of RCP is mainly determined by its HPP component.

[0059] (2) When the RCP content is high, the LSP component plays a dominant role in the competitive adsorption coefficient of RCP. This is because, with the increase of the LSP component in RCP and the RCP content in cement paste, the LSP component provides more strong affinity sites for complexation with the water-reducing agent. In addition, with the increase of RCP content, the contribution of the water-reducing agent content to the competitive adsorption coefficient of RCP gradually decreases, while the composition of the recycled micronized mineral powder becomes the main influencing factor.

[0060] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for quantifying the competitive adsorption of water-reducing agents by recycled micro-powder and cement, characterized in that, Includes the following steps: (1) Obtaining the phase composition of the regenerated micro powder and each phase component mass parts f i ; (2) Under consistent test conditions, pure cement and pure components with different water-reducing agent dosages were prepared respectively. Single-component slurries and slurries with different water-reducing agent dosages and components Two-component paste containing both cement and other components; (3) The water-reducing agent equilibrium adsorption test was performed on the single-component slurry and the two-component slurry to obtain cement and components. Water-reducing agent saturated adsorption capacity Adsorption equilibrium constant k and total adsorption amount of water-reducing agent in two-component slurry ; (4) Establish the following including adsorption weights Calculation model for total adsorption capacity of two-component slurry: ； in, Components Or cement, Let j be the adsorption weight of the water-reducing agent. The mass fraction of phase j in a two-component slurry and water-reducing agent dosage C and The functional relationship that is satisfied; (5) Establish components competitive adsorption coefficient Computational model: ； in, Regenerated micro powder phase components The competitive adsorption coefficient, which is defined as the component in a binary slurry... The normalized adsorption weight relative to cement, Regenerated micro powder phase components The adsorption weight of water-reducing agents The adsorption weight of cement for water-reducing agents, Components quality score and water-reducing agent dosage C and The functional relationship that is satisfied; (6) Calculate the competitive adsorption coefficient of the regenerated micro powder by establishing the following model or a weighted model that is physically equivalent to it. : ； Among them, f i The components of each phase Mass fraction of the recycled micro powder It is a component The competitive adsorption coefficient; (7) Output As a quantitative parameter characterizing the competitive adsorption intensity and non-uniform distribution of water-reducing agents in the recycled micro-powder-cement system.

2. The method for competitive adsorption of water-reducing agents by recycled micro-powder and cement according to claim 1, characterized in that, In step (1), the phase components of the regenerated micro powder Including but not limited to limestone component LSP, quartz component QZP, and hardened cement paste component HPP.

3. The method for competitive adsorption of water-reducing agents by recycled micro-powder and cement according to claim 1, characterized in that, In step (2), the dosage of water-reducing agent ranges from 0% to 100% of the saturated dosage.

4. The method for competitive adsorption of water-reducing agents by recycled micro-powder and cement according to claim 1, characterized in that, In step (3), the equilibrium adsorption test of the water-reducing agent is carried out using the TOC method, and the cement and components... Water-reducing agent saturated adsorption capacity and The following Langmuir monolayer adsorption model was fitted: ； in, This refers to the amount of water-reducing agent adsorbed on solid particles. Let be the concentration of the water-reducing agent in the porous solution under adsorption equilibrium conditions, and be the saturated adsorption amount of the water-reducing agent on the solid particles. is the adsorption equilibrium constant.

5. The method for competitive adsorption of water-reducing agents by recycled micro-powder and cement according to claim 1, characterized in that, In step (4), The specific model is as follows: ； in, It represents any phase in LSP, QZP, HPP, or cement. yes Phase mass fraction, yes The relative saturated adsorption capacity of the water-reducing agent yes The adsorption equilibrium constant of the phase, where C is the water-reducing agent dosage. The heterogeneity factor is calculated based on the Sips model fitting. Is the mass fraction of phase j and The absolute value of the quadratic coefficient in a quadratic equation that satisfies the given conditions.

6. The method for competitive adsorption of water-reducing agents by recycled micro-powder and cement according to claim 1, characterized in that, In step (5), The specific model is as follows: ； ； ； in, It is the mass fraction of the limestone component. It is the mass fraction of the quartz component. C is the mass fraction of the hardened cement paste components, and C is the dosage of water-reducing agent.

7. The method for competitive adsorption of water-reducing agents by recycled micro-powder and cement according to claim 1, characterized in that, In step (6), the specific calculation model for the competitive adsorption coefficient of the regenerated micro powder is as follows: ； in, It is the mass fraction of limestone components in the recycled micro powder. It is the mass fraction of quartz component in the regenerated micro powder. It is the mass fraction of the hardened cement paste component in the recycled powder, and The rest are trace impurities, which can be ignored.

8. The method for competitive adsorption of water-reducing agents by recycled micro-powder and cement according to claim 2, characterized in that, The limestone component in the recycled micro powder originates from the coarse aggregate phase of the parent concrete; the quartz component originates from the fine aggregate phase of the parent concrete; and the hardened cement paste component originates from the hardened cement paste phase of the parent concrete.

9. A method for competitive adsorption of water-reducing agents by recycled micro-powder and cement according to any one of claims 1 to 7, characterized in that, The Phase mass fraction The value range is (0,1); the component quality score The value range is (0%, 100%); the water-reducing agent dosage C ranges from (0, +∞).

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