CN117473785A - Mixing proportion design method of full solid waste regenerated fluid mixture - Google Patents
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- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 3
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention provides a mixing proportion design method of a full solid waste regenerated fluid mixture, and belongs to the technical field of fluid mixtures. The invention provides a mix proportion design method of a full solid waste regenerated fluid mixture, which adopts full solid waste cementing material and full solid waste base material as raw materials, thereby realizing the recycling of various solid wastes. In addition, the method for determining the composition range of the cementing material is simple, reasonable and universal, comprehensively reflects the performances of the cementing materials with different compositions according to a small amount of mixing proportion, and is suitable for any ternary cementing material system. The strength model fitting degree is good, the verification is reliable, and the popularization and application of the full solid waste regenerated fluid state mixture are facilitated.
Description
Technical Field
The invention relates to the technical field of fluid state mixtures, in particular to a mixing proportion design method of a full solid waste regenerated fluid state mixture.
Background
The subsidence disease of traditional backfill compaction not only seriously influences the outward appearance and the function of road surface, leads to the emergence of traffic accident, can also cause building and infrastructure's damage, increases engineering risk. In addition, the undercompacted backfill is unstable, and geological disasters such as landslide, collapse and ground subsidence are easy to occur. The fluid mixture is used as a controllable low-strength material (Controlled Low Strength Materials, CLSM for short) used in backfilling engineering, has high fluidity, can be filled by self without or with little vibration under the action of dead weight, forms a self-compaction structure, and has more attractive force and practicability compared with the traditional compaction backfilling. In recent years, many scholars at home and abroad research on fluid state mixtures, prepare cement-based fluid state mixtures by using machine-made sand and soil to replace concrete gravel fine aggregate, and prepare non-cement-based fluid state mixtures by using lime to excite slag powder, fly ash and the like.
Along with the rapid development of urban and construction activities, the quantity of construction wastes is continuously increased. To promote sustainable development and resource protection, many countries and regions have established relevant laws and policies that actively encourage the recycling of construction waste. The core of the recycling of the construction waste is to treat the brick and tile concrete into recycled aggregate to replace natural aggregate to prepare building materials, and the solid waste is fully utilized while the demand for the original natural material is reduced. Application research of a large amount of recycled aggregate in building materials is carried out at home and abroad, and the influence of the recycled aggregate on cement-based CLSM performance is carried out in the CLSM field. In the regeneration treatment process of the construction waste, redundant soil is taken as granules which are separated by a soil removing system and are smaller than the specified particle size, the granules account for 25% -40% of the total quantity of the construction waste, the components are complex, mortar and brick-concrete particles exist, a large number of clay particles exist, the granules cannot be used as aggregate, most of the granules are discharged for the second time, and the utilization rate of the actual resources of the construction waste is seriously influenced.
On the other hand, the production and use of cement place an increasingly heavy load on the resource environment, and reducing or even eliminating the reliance on cement has become a major direction of building material research. And the alkaline waste residues in the solid waste have irritation and corrosiveness, so that the open-air stacking and landfill have serious influence on the natural environment, and the safe utilization is needed. The Cl-in the alkaline waste residue can damage the passivation film layer on the surface of the steel bar, accelerates the corrosion of the steel bar, has the passivation removing effect, and cannot be applied to structural buildings. The backfill material is mainly used for backfilling the pavement base layer and the road, and the risk of steel bar corrosion does not exist.
By combining the above, if the alkaline waste residue, the slag powder and the fly ash can be used for replacing the traditional cement, redundant soil is largely utilized, and recycled aggregate is used for adjusting the gradation of the recycled aggregate to prepare the fluid mixture for backfilling, the method has positive significance for recycling the construction waste and promoting sustainable development. However, the alkaline waste residue components in different areas and different industries are very different, and the development of any one of the technologies is difficult to be applied to other technologies, so that a feasible mixing proportion design method is found to become a necessary condition for popularization and application of the full solid waste regenerated fluid mixture.
Disclosure of Invention
The invention aims to provide a mixing proportion design method of a full solid waste regenerated fluid mixture, which solves the problems that solid waste components in different areas and different industries are large in difference and cannot be suitable for the same mixing proportion.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a mixing proportion design method of a full solid waste regenerated fluid mixture, which comprises the following steps:
(1) The method comprises the steps of taking alkaline waste residue, slag powder and fly ash as cementing materials, adopting a triangle isenthalpic diagram method, respectively setting the alkaline waste residue, slag powder and fly ash as a lower bottom, a left waist and a right waist, respectively mixing the alkaline waste residue and the fly ash from 0 to 80% and the slag content from 100 to 20%, respectively drawing characteristic distribution of the cementing material strength and fluidity in the triangle isenthalpic diagram, and selecting a higher value region of the cementing material strength and fluidity in the triangle isenthalpic diagram to determine the mixing amount range of the alkaline waste residue, the slag powder and the fly ash, namely the composition range of the cementing material;
(2) In the mixing amount range determined in the step (1), 1-point cementing material composition is arbitrarily selected in a triangle-shaped isoenthalpy diagram, 10% mixing amount of the cementing material is fixed, redundant soil and brick-concrete fine aggregate are taken as base materials, the proportion of the redundant soil and the brick-concrete fine aggregate is changed, the water adding amount is controlled according to the flow expansion degree of 180-200 mm, and the cementing material, the redundant soil and the brick-concrete fine aggregate are mixed to obtain a mixture; measuring the compressive strength and the bleeding rate of the mixture, and selecting a brick-concrete fine aggregate/redundant soil with the bleeding rate not more than 8% and the highest compressive strength as a base material;
(3) Selecting at least 6 typical points in the triangle isenthalpic diagram within the doping amount range determined in the step (1), selecting 3 total cementing materials in 8% -20% according to the composition of the cementing materials of the typical points, adding base materials according to the proportion determined in the step (2), controlling the water adding amount according to the flow expansion degree of 180-200 mm, preparing regenerated fluid mixture with different mixing ratios, and determining the 28d compressive strength of the regenerated fluid mixture test pieces with different mixing ratios;
(4) Combining the mixing amount of each cementing material with the compressive strength of the regenerated fluid mixture test piece 28d to establish a ternary linear regression equation shown in the formula 1, wherein y=A 0 +A 1 x 1 +A 2 x 2 +A 3 x 3 Formula 1;
in formula 1: y is the compressive strength value of the regenerated fluid mixture test piece 28d, and the unit is MPa; x is x 1 The mass percent of the slag powder in the regenerated fluid mixture is percent; x is x 2 The mass percent of the fly ash in the regenerated fluid mixture is percent; x is x 3 The mass percent of the alkaline waste residue in the regenerated fluid mixture is shown in percent; a is that 0 For the intercept of the equation, A 1 、A 2 And A 3 Representing a linear regression coefficient value;
regression analysis is carried out on the ternary linear regression equation to determine A 1 、A 2 And A 3 And further determining the value of (1) to obtain x 1 、x 2 And x 3 Equation 1 as a variable; equation 1 correlation coefficient R 2 When the fitting degree is more than 0.8, the fitting degree is good; otherwise, adding a cementing material mixing amount point in the triangle isoenthalpy diagram, measuring the 28d compressive strength of the regenerated fluid mixture test pieces with different mixing ratios according to the step (3), and fitting again according to all 28d compressive strength test results until R is reached 2 Greater than 0.8;
randomly selecting 6 composition points in the doping amount range determined in the step (1), selecting 3 total cementing materials in the range of 8% -20%, substituting the total cementing materials into an equation of formula 1, and calculating an intensity predicted value; adding base materials according to a proportion, controlling the water adding amount by using the flow expansion degree of 180-200 mm, actually measuring the 28d compressive strength of the regenerated fluid mixture test piece, calculating the difference range of an actually measured value and a predicted value, and when the difference range of each regenerated fluid mixture test piece is not more than 10%, relatively accurate model, and can be used for predicting the strength of the regenerated fluid mixture; otherwise, continuing to increase the mixing amount point of the cementing material in the triangle isoenthalpy diagram, measuring the 28d compressive strength according to the step (3), and carrying out fitting and test verification again according to all the 28d compressive strength test results until the difference range between the measured value and the predicted value is not more than 10%;
(6) And (3) calculating the composition of the cementing material according to the equation determined in the step (4) and combining the base material composition determined in the step (2) to obtain the mixing ratio of the full solid waste regenerated fluid mixture.
Preferably, in the step (1), when the mixing amount range of the alkaline waste residue, the slag powder and the fly ash is determined by selecting a higher value region of the strength and the fluidity of the cementing material in the triangular isoenthalpy chart, the compressive strength of the cementing material is taken as a main reference, and the fluidity is taken as an auxiliary reference.
Preferably, in the step (1), the gel material strength includes 3d compressive strength, 7d compressive strength and 28d compressive strength.
Preferably, in the step (3), the total amount of 3 cementing materials selected from 8% -20% is: wherein the total amount of one cementing material is below 10%, the total amount of the other cementing material is 20%, and the total amount of the rest cementing materials is between 8 and 20%.
Preferably, in the step (5), when determining the mixing ratio of the all-solid-waste regenerated fluid mixture, the production quality level coefficient is 1.2, and the principles of low mixing amount of slag powder and high mixing amount of alkaline waste residue are adopted.
Preferably, the alkaline waste residue is waste residue generated after acetylene gas is obtained by hydrolyzing calcium carbide, and the screen residue of 0.075mm is not more than 30%.
Preferably, the brick-concrete fine aggregate is obtained by crushing and screening construction waste mainly comprising brick concrete; the grain size of the brick-concrete fine aggregate is smaller than 4.75mm.
Preferably, in the step (4), the regression analysis of the ternary linear regression equation uses origin software.
Preferably, the redundant soil is undersize after the soil removal process in the regeneration treatment of the construction waste; the particle size of the redundant soil is not more than 25mm.
The invention provides a mix proportion design method of a full solid waste regenerated fluid mixture, which adopts full solid waste cementing material and full solid waste base material as raw materials, thereby realizing the recycling of various solid wastes.
In addition, the method for determining the composition range of the cementing material is simple, reasonable and universal, comprehensively reflects the performances of the cementing materials with different compositions according to a small amount of mixing proportion, and is suitable for any ternary cementing material system.
The strength model fitting degree is good, the verification is reliable, and the popularization and application of the full solid waste regenerated fluid state mixture are facilitated.
Drawings
Fig. 1 is a triangular isoenthalpy diagram;
fig. 2 is a characteristic distribution diagram of cement strength and fluidity in a triangle isoenthalpy diagram.
Detailed Description
The invention provides a mixing proportion design method of a full solid waste regenerated fluid mixture, which comprises the following steps:
(1) The method comprises the steps of taking alkaline waste residue, slag powder and fly ash as cementing materials, adopting a triangle isenthalpic diagram method, respectively setting the alkaline waste residue, slag powder and fly ash as a lower bottom, a left waist and a right waist, respectively mixing the alkaline waste residue and the fly ash from 0 to 80% and the slag content from 100 to 20%, respectively drawing characteristic distribution of the cementing material strength and fluidity in the triangle isenthalpic diagram, and selecting a higher value region of the cementing material strength and fluidity in the triangle isenthalpic diagram to determine the mixing amount range of the alkaline waste residue, the slag powder and the fly ash, namely the composition range of the cementing material;
(2) In the mixing amount range determined in the step (1), 1-point cementing material composition is arbitrarily selected in a triangle-shaped isoenthalpy diagram, 10% mixing amount of the cementing material is fixed, redundant soil and brick-concrete fine aggregate are taken as base materials, the proportion of the redundant soil and the brick-concrete fine aggregate is changed, the water adding amount is controlled according to the flow expansion degree of 180-200 mm, and the cementing material, the redundant soil and the brick-concrete fine aggregate are mixed to obtain a mixture; measuring the compressive strength and the bleeding rate of the mixture, and selecting a brick-concrete fine aggregate/redundant soil with the bleeding rate not more than 8% and the highest compressive strength as a base material;
(3) Selecting at least 6 typical points in the triangle isenthalpic diagram within the doping amount range determined in the step (1), selecting 3 total cementing materials in 8% -20% according to the composition of the cementing materials of the typical points, adding base materials according to the proportion determined in the step (2), controlling the water adding amount according to the flow expansion degree of 180-200 mm, preparing regenerated fluid mixture with different mixing ratios, and determining the 28d compressive strength of the regenerated fluid mixture test pieces with different mixing ratios;
(4) Combining the mixing amount of each cementing material with the compressive strength of the regenerated fluid mixture test piece 28d to establish a ternary linear regression equation shown in the formula 1, wherein y=A 0 +A 1 x 1 +A 2 x 2 +A 3 x 3 Formula 1;
in formula 1: y is the compressive strength value of the regenerated fluid mixture test piece 28d, and the unit is MPa; x is x 1 The mass percent of the slag powder in the regenerated fluid mixture is percent; x is x 2 The mass percent of the fly ash in the regenerated fluid mixture is percent; x is x 3 The mass percent of the alkaline waste residue in the regenerated fluid mixture is shown in percent; a is that 0 For the intercept of the equation, A 1 、A 2 And A 3 Representing a linear regression coefficient value;
regression analysis is carried out on the ternary linear regression equation to determine A 1 、A 2 And A 3 And further determining the value of (1) to obtain x 1 、x 2 And x 3 Equation 1 as a variable; equation 1 correlation coefficient R 2 When the fitting degree is more than 0.8, the fitting degree is good; otherwise, adding a cementing material mixing amount point in the triangle isoenthalpy diagram, and measuring the 28d compressive strength of the regenerated fluid mixture test pieces with different mixing ratios according to the step (3) so as toFitting again for all 28d compressive strength test results until R 2 Greater than 0.8;
randomly selecting 6 composition points in the doping amount range determined in the step (1), selecting 3 total cementing materials in the range of 8% -20%, substituting the total cementing materials into an equation of formula 1, and calculating an intensity predicted value; adding base materials according to a proportion, controlling the water adding amount by using the flow expansion degree of 180-200 mm, actually measuring the 28d compressive strength of the regenerated fluid mixture test piece, calculating the difference range of an actually measured value and a predicted value, and when the difference range of each regenerated fluid mixture test piece is not more than 10%, relatively accurate model, and can be used for predicting the strength of the regenerated fluid mixture; otherwise, continuing to increase the mixing amount point of the cementing material in the triangle isoenthalpy diagram, measuring the 28d compressive strength according to the step (3), and carrying out fitting and test verification again according to all the 28d compressive strength test results until the difference range between the measured value and the predicted value is not more than 10%;
(5) And (3) calculating the composition of the cementing material according to the equation determined in the step (4) and combining the base material composition determined in the step (2) to obtain the mixing ratio of the full solid waste regenerated fluid mixture.
The invention firstly takes alkaline waste residue, slag powder and fly ash as cementing materials, adopts a triangle isenthalpic diagram method, respectively sets the alkaline waste residue (JZ), slag powder (Slag) and Fly Ash (FA) as a lower bottom, a left waist and a right waist, respectively sets the mixing amount of the alkaline waste residue and the fly ash from 0 to 80 percent and the mixing amount of the Slag from 100 to 20 percent (as shown in figure 1), respectively draws the characteristic distribution of the cementing material strength and the fluidity in triangle isenthalpic diagrams, and selects the higher value area of the cementing material strength and the fluidity in the triangle isenthalpic diagrams to determine the mixing amount range of the alkaline waste residue, the Slag powder and the fly ash, namely the composition range of the cementing materials.
In the invention, the alkaline waste residue is preferably waste residue generated after acetylene gas is obtained by hydrolyzing calcium carbide, and the 0.075mm screen residue of the alkaline waste residue is preferably not more than 30%.
In the invention, the slag powder is obtained by grinding water slag generated by blast furnace ironmaking; meets GB/T18046-2017 of granulated blast furnace slag powder for cement, mortar and concrete.
In the invention, the fly ash is powder particles collected from flue gas after coal combustion; meets the requirement of GB/T1596-2017 of fly ash for cement and concrete.
In the present invention, the gel strength includes 3d compressive strength, 7d compressive strength and 28d compressive strength.
In the invention, when a higher value region of the strength and the fluidity of the cementing material in the triangular isoenthalpy diagram is selected to determine the mixing amount range of the alkaline waste residue, the slag powder and the fly ash, the compressive strength of the cementing material is preferably used as a main reference, and the fluidity is used as an auxiliary reference; among them, the compressive strength is more preferably 28d compressive strength as a main reference, and other age compressive strengths as auxiliary references.
After determining the mixing amount range of alkaline waste residue, slag powder and fly ash, namely the mixing amount range of cementing materials, the invention randomly selects 1-point cementing material composition in a triangle isoenthalpy diagram within the mixing amount range determined in the step (1), fixes 10% mixing amount of the cementing materials, takes redundant soil and brick-mixed fine aggregate as base materials, changes the proportion of the redundant soil and the brick-mixed fine aggregate, controls the water adding amount according to the flow expansion degree of 180-200 mm, and mixes the cementing materials, the redundant soil and the brick-mixed fine aggregate to obtain a mixture; and (3) measuring the compressive strength and the bleeding rate of the mixture, and selecting the brick-concrete fine aggregate/redundant soil with the bleeding rate not more than 8% and the highest compressive strength as a base material.
In the invention, the redundant soil is preferably undersize of the soil removal process in the regeneration treatment of the construction waste; the particle size of the redundant soil is preferably not more than 25mm.
In the invention, the brick-concrete fine aggregate is preferably obtained by crushing and screening construction wastes mainly containing brick concrete; the particle size of the fine brick-concrete aggregate is preferably less than 4.75mm.
After the composition of the base material is determined, at least 6 typical points are selected in the triangle isenthalpic diagram within the doping amount range determined in the step (1), 3 total cementing materials are selected at 8% -20% according to the composition of the typical points, the base material is added according to the proportion determined in the step (2), the water adding amount is controlled according to the flow expansion degree of 180-200 mm, the regenerated fluid mixture with different mixing ratios is prepared, and the 28d compressive strength of the regenerated fluid mixture test piece with different mixing ratios is determined.
In the present invention, the typical points refer to points that are distributed in a dispersion within the doping amount range. In the invention, the total amount of 3 cementing materials selected from 8% -20% is preferably: wherein the total amount of one cementing material is below 10%, the total amount of the other cementing material is 20%, and the total amount of the rest cementing materials is between 8% and 20%. In the examples of the present invention, the total amount of 3 binders was 10%, 8% and 20%, respectively.
After the 28d compressive strength of the regenerated fluid mixture test pieces with different mixing ratios is measured, the invention combines the mixing amount of each cementing material with the 28d compressive strength of the regenerated fluid mixture test piece, establishes a ternary linear regression equation shown in the formula 1, and y=A 0 +A 1 x 1 +A 2 x 2 +A 3 x 3 Formula 1;
in formula 1: y is the compressive strength value of the regenerated fluid mixture test piece 28d, and the unit is MPa; x is x 1 The mass percent of the slag powder in the regenerated fluid mixture is percent; x is x 2 The mass percent of the fly ash in the regenerated fluid mixture is percent; x is x 3 The mass percent of the alkaline waste residue in the regenerated fluid mixture is shown in percent; a is that 0 For the intercept of the equation, A 1 、A 2 And A 3 Representing a linear regression coefficient value; before establishing a ternary linear regression equation, the invention needs to convert the ratio of each component in the cementing material into the ratio in the regenerated fluid mixture;
regression analysis is performed on the ternary linear regression equation, preferably by adopting origin software, to determine A 1 、A 2 And A 3 And further determining the value of (1) to obtain x 1 、x 2 And x 3 Equation 1 as a variable; equation 1 correlation coefficient R 2 When the fitting degree is more than 0.8, the fitting degree is good; otherwise, adding the mixing amount point of the cementing material into the triangular isoenthalpy diagram, measuring the 28d compressive strength of the regenerated fluid mixture test pieces with different mixing ratios according to the step (3), and testing the total 28d compressive strengthThe results were fitted again until R 2 Greater than 0.8;
randomly selecting 6 composition points in the doping amount range determined in the step (1), selecting 3 total cementing materials in the range of 8% -20%, substituting the total cementing materials into an equation of formula 1, and calculating an intensity predicted value; adding base materials according to a proportion, controlling the water adding amount by using the flow expansion degree of 180-200 mm, actually measuring the 28d compressive strength of the regenerated fluid mixture test piece, calculating the difference range of an actually measured value and a predicted value, and when the difference range of each regenerated fluid mixture test piece is not more than 10%, relatively accurate model, and can be used for predicting the strength of the regenerated fluid mixture; otherwise, continuously adding the mixing amount point of the cementing material in the triangular isoenthalpy diagram, measuring the 28d compressive strength according to the step (3), and carrying out fitting and test verification again according to all the 28d compressive strength test results until the difference range between the measured value and the predicted value is not more than 10%.
After the equation of the formula 1 is determined, according to the requirement of the target strength, the composition of the cementing material is calculated according to the equation determined in the step (4), and the composition of the base material determined in the step (2) is combined to obtain the mixing ratio of the full solid waste regenerated fluid state mixture.
When determining the mixing ratio of the full solid waste regenerated fluid mixture, the invention takes the low mixing amount of slag powder and the high mixing amount of alkaline waste slag as the principle in consideration of the production quality level coefficient of 1.2.
The invention carries out the mix proportion design based on the full solid waste cementing material and the full solid waste base material; the method for determining the composition range of the cementing material is simple, reasonable and universal, and the performances of the cementing materials with different compositions are comprehensively reflected by a small amount of mixing proportion; the strength model fitting degree is good, the verification is reliable, and the popularization and application of the full solid waste regenerated fluid state mixture are facilitated.
The following describes the method for designing the mixing ratio of the all-solid-waste regenerated fluid mixture provided by the invention in detail by combining the examples, but the method is not to be interpreted as limiting the protection scope of the invention.
Example 1
(1) Determining the composition range of the cementing material comprising alkaline waste residue, slag powder and fly ash by adopting a triangle isenthalpic diagram method, wherein the composition design of the cementing material is shown in table 1;
TABLE 1 composition design of cementing materials
Drawing the characteristic distribution of the strength and the fluidity of the cementing material in a triangle isoenthalpy chart according to the test result, and referring to fig. 2;
and analyzing the medium-high line of the graph to determine that the doping amount range of each component is 15-50% of alkaline waste residue, 20-85% of slag and 0-40% of fly ash.
(2) Determining a binder composition comprising a redundant soil, a brick-mix fine aggregate
The composition of the group B adhesive is selected, the total doping amount is 10%, and the test results are shown in Table 2.
TABLE 2 results of experiments on different base compositions
The test results in Table 2 are analyzed, the bleeding rate of the mixture is far lower than 8% as a whole, and the compressive strength of the fine aggregate/soil at each age is higher when the fine aggregate/soil is 0.25.
(3) Determination of the compressive Strength of the regenerated fluid mixture
Selecting the rubber composition of a typical point P, Q, R, S, T, U in a triangular isenthalpic diagram, selecting 8%, 10% and 20% of the total rubber, and measuring the compressive strength of the regenerated fluid mixture, wherein the compressive strength is shown in Table 3;
table 3 compressive strength data for regenerated fluid mixtures
(4) Mixture strength fitting and verification
Regression analysis of the data from Table 3 using origin software to determine A 1 、A 2 And A 3 The equation is obtained as follows
y＝-1.52076+0.53668x 1 +0.18455x 2 +0.22292x 3
Correlation coefficient R 2 = 0.97322, the fitting degree is good.
Selecting a point L, K, J, M, N, O in a triangular isoenthalpy chart (figure 1), substituting 20%, 15% and 10% of the total amount of the rubber material into the equation to calculate and obtain a strength predicted value of the regenerated fluid mixture; mixing the mixture according to the proportion, and measuring the compressive strength of the regenerated fluid mixture. The predicted value and the test value of each mixture ratio are shown in the following table 4;
TABLE 4 predicted and tested values of compressive strength for regenerated fluid mixtures of different mix ratios
The difference value between the test value and the predicted value of the compressive strength of the mixture test piece 28d is between-6.9% and 9%, and the model is relatively accurate and can be used for predicting the strength of the mixture;
(5) Determination of the mixing ratio of the mixture
According to the equation determined in the step (4), if the 28d design strength is 1.0MPa, 2.0MPa and 4.0MPa respectively, and the production quality level coefficient is 1.2, the trial strength is 1.2MPa, 2.4MPa and 4.8MPa respectively, and the calculated result and the actual strength of the mixture mixing ratio are shown in the following table 5.
TABLE 5 calculation of mix proportion and actual Strength
As shown in the results of Table 5, the actual strength of the total solid waste regenerated fluid mixture designed by the mixing ratio design method of the invention is higher than the target design strength, which indicates that the method of the invention has high accuracy and can meet the actual application.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (9)
1. The mixing proportion design method of the full solid waste regenerated fluid mixture comprises the following steps:
(1) The method comprises the steps of taking alkaline waste residue, slag powder and fly ash as cementing materials, adopting a triangle isenthalpic diagram method, respectively setting the alkaline waste residue, slag powder and fly ash as a lower bottom, a left waist and a right waist, respectively mixing the alkaline waste residue and the fly ash from 0 to 80% and the slag content from 100 to 20%, respectively drawing characteristic distribution of the cementing material strength and fluidity in the triangle isenthalpic diagram, and selecting a higher value region of the cementing material strength and fluidity in the triangle isenthalpic diagram to determine the mixing amount range of the alkaline waste residue, the slag powder and the fly ash, namely the composition range of the cementing material;
(2) In the mixing amount range determined in the step (1), 1-point cementing material composition is arbitrarily selected in a triangle-shaped isoenthalpy diagram, 10% mixing amount of the cementing material is fixed, redundant soil and brick-concrete fine aggregate are taken as base materials, the proportion of the redundant soil and the brick-concrete fine aggregate is changed, the water adding amount is controlled according to the flow expansion degree of 180-200 mm, and the cementing material, the redundant soil and the brick-concrete fine aggregate are mixed to obtain a mixture; measuring the compressive strength and the bleeding rate of the mixture, and selecting a brick-concrete fine aggregate/redundant soil with the bleeding rate not more than 8% and the highest compressive strength as a base material;
(3) Selecting at least 6 typical points in the triangle isenthalpic diagram within the doping amount range determined in the step (1), selecting 3 total cementing materials in 8% -20% according to the composition of the cementing materials of the typical points, adding base materials according to the proportion determined in the step (2), controlling the water adding amount according to the flow expansion degree of 180-200 mm, preparing regenerated fluid mixture with different mixing ratios, and determining the 28d compressive strength of the regenerated fluid mixture test pieces with different mixing ratios;
(4) Mixing the cementing materials and the regenerated fluid mixtureTest piece 28d compressive strength is combined, a ternary linear regression equation shown in the formula 1 is established, and y=A 0 +A 1 x 1 +A 2 x 2 +A 3 x 3 Formula 1;
in formula 1: y is the compressive strength value of the regenerated fluid mixture test piece 28d, and the unit is MPa; x is x 1 The mass percent of the slag powder in the regenerated fluid mixture is percent; x is x 2 The mass percent of the fly ash in the regenerated fluid mixture is percent; x is x 3 The mass percent of the alkaline waste residue in the regenerated fluid mixture is shown in percent; a is that 0 For the intercept of the equation, A 1 、A 2 And A 3 Representing a linear regression coefficient value;
regression analysis is carried out on the ternary linear regression equation to determine A 1 、A 2 And A 3 And further determining the value of (1) to obtain x 1 、x 2 And x 3 Equation 1 as a variable; equation 1 correlation coefficient R 2 When the fitting degree is more than 0.8, the fitting degree is good; otherwise, adding a cementing material mixing amount point in the triangle isoenthalpy diagram, measuring the 28d compressive strength of the regenerated fluid mixture test pieces with different mixing ratios according to the step (3), and fitting again according to all 28d compressive strength test results until R is reached 2 Greater than 0.8;
randomly selecting 6 composition points in the doping amount range determined in the step (1), selecting 3 total cementing materials in the range of 8% -20%, substituting the total cementing materials into an equation of formula 1, and calculating an intensity predicted value; adding base materials according to a proportion, controlling the water adding amount by using the flow expansion degree of 180-200 mm, actually measuring the 28d compressive strength of the regenerated fluid mixture test piece, calculating the difference range of an actually measured value and a predicted value, and when the difference range of each regenerated fluid mixture test piece is not more than 10%, relatively accurate model, and can be used for predicting the strength of the regenerated fluid mixture; otherwise, continuing to increase the mixing amount point of the cementing material in the triangle isoenthalpy diagram, measuring the 28d compressive strength according to the step (3), and carrying out fitting and test verification again according to all the 28d compressive strength test results until the difference range between the measured value and the predicted value is not more than 10%;
(5) And (3) calculating the composition of the cementing material according to the equation determined in the step (4) and combining the base material composition determined in the step (2) to obtain the mixing ratio of the full solid waste regenerated fluid mixture.
2. The method according to claim 1, wherein in the step (1), when the mixing amount range of the alkaline waste residue, the slag powder and the fly ash is determined by selecting a higher value region of the strength and the fluidity of the cementing material in the triangular isoenthalpy diagram, the compressive strength of the cementing material is used as a main reference, and the fluidity is used as an auxiliary reference.
3. The mix design method according to claim 1 or 2, wherein in the step (1), the gel material strength includes 3d compressive strength, 7d compressive strength and 28d compressive strength.
4. The method according to claim 1, wherein in the step (3), 3 total amounts of the cementing materials are selected from 8% -20%: wherein the total amount of one cementing material is below 10%, the total amount of the other cementing material is 20%, and the total amount of the rest cementing materials is between 8 and 20%.
5. The method according to claim 1, wherein in the step (5), when determining the mixing ratio of the all solid waste regenerated fluid mixture, the production quality level coefficient is 1.2, and the principles of low mixing amount of slag powder and high mixing amount of alkaline waste slag are adopted.
6. The mix proportion design method according to claim 1 or 2, wherein the alkaline waste residue is waste residue generated after acetylene gas is obtained by hydrolyzing calcium carbide, and the screen residue of 0.075mm is not more than 30%.
7. The mix proportion design method according to claim 1, wherein the brick-concrete fine aggregate is obtained by crushing and screening construction waste mainly comprising brick-concrete; the grain size of the brick-concrete fine aggregate is smaller than 4.75mm.
8. The method of claim 1, wherein in the step (4), the regression analysis of the ternary linear regression equation uses origin software.
9. The mix design method of claim 1, wherein the redundant soil is undersize of a soil removal process in the regeneration treatment of construction waste; the particle size of the redundant soil is not more than 25mm.
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