1. A slurry mixed slurry is characterized in that the mixed slurry is obtained based on an orthogonal test and a test, and comprises the following raw materials in parts by weight: 100 parts of cement, 260-320 parts of slurry, 0-30 parts of fly ash and 20-41 parts of bentonite.

2. The slurry mixing slurry according to claim 1, wherein the mixing slurry comprises the following raw materials in parts by weight: 100 parts of cement, 260-280 parts of slurry, 10-30 parts of fly ash and 27-41 parts of bentonite.

3. The slurry mixing slurry according to claim 1, wherein the mixing slurry comprises the following raw materials in parts by weight: 100 parts of cement, 280-320 parts of slurry, 10-30 parts of fly ash and 20-27 parts of bentonite.

4. A slurry blend slurry according to any one of claims 1 to 3, wherein said cement is P.O 42.5.5 cement.

5. The slurry blend slurry of any of claims 1-3, wherein said fly ash is class F-I fly ash.

6. A slurry blend slurry according to any one of claims 1 to 3, wherein said bentonite is sodium bentonite.

7. The slurry mixing slurry as claimed in claim 6, wherein the sodium bentonite has a specific gravity of not more than 1.14 and a viscosity of not less than 22.5S.

8. The slurry mixture according to claim 7, wherein the sodium bentonite is a sodium bentonite having a specific gravity of not more than 1.14 and a viscosity of not less than 22.5S in a non-foamed state.

9. A slurry blend slurry according to claim 1 or 2 or 3 or 7 or 8, wherein said slurry is construction produced slurry.

10. A method for preparing the slurry mixture slurry as claimed in any one of claims 1 to 9, wherein the cement, the slurry, the fly ash and the bentonite are put into a stirring device in parts by weight and stirred uniformly.

Background

The building slurry is mainly produced by the construction of the following projects: drilling pile foundation construction slurry is generated by drilling hole forming construction modes such as a rotary drilling rig, a forward and reverse circulation drilling rig and an impact drilling rig; the underground diaphragm wall construction slurry is produced by a diaphragm wall, double-wheel milling and other equipment grooving construction mode. The discharge of the slurry can pollute a construction site, a special slurry pool needs to occupy a large amount of construction sites, and a special slurry transport vehicle needs to transport the slurry out of the construction site, so that a large amount of manpower, vehicles and machinery are wasted.

According to the prior art, patent number 201910054875.2 provides synchronous mortar containing water shield waste slurry and a preparation method thereof, each mortar comprises 20-30% of shield waste slurry, 30-45% of screening slag soil, 16-27% of blast furnace slag powder, 3-5% of phosphorous slag powder, 3-7% of desulfurized gypsum and 4-7% of active additive in dry basis weight percentage, and water is 60-85% of solid concentration.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a slurry mixed slurry and a preparation method thereof.

In order to achieve the above purpose, the invention provides the following technical scheme:

a slurry mixed slurry is obtained based on an orthogonal test and a test, and comprises the following raw materials in parts by weight: 100 parts of cement, 260-320 parts of slurry, 0-30 parts of fly ash and 20-41 parts of bentonite.

The invention obtains the slurry mixed slurry through a large number of tests, the slurry mixed slurry has small consistency, higher strength and low bleeding rate, can accommodate slurry generated by construction, has the overall performance meeting the construction requirement, and has low cost and easy implementation.

In the present invention, preferably, the mixed slurry comprises the following raw materials in parts by weight: 100 parts of cement, 260-280 parts of slurry, 10-30 parts of fly ash and 27-41 parts of bentonite.

In the present invention, preferably, the mixed slurry comprises the following raw materials in parts by weight: 100 parts of cement, 280-320 parts of slurry, 10-30 parts of fly ash and 20-27 parts of bentonite.

In the present invention, it is preferable that P.O 42.5.5 cement is used as the cement.

In the invention, under the condition of not considering the slurry generated in the consumption construction, most constructions can finish the operation by adopting cement; the corresponding cement grade can be selected according to construction requirements, and when the mud generated by construction needs to be consumed, the cement is used as the basis, and the grout and the cement are mixed. The invention has found in tests that when P.O 42.5.5 cement is used as the cement, the hardness and strength of the mixed slurry can be ensured due to the high strength of the cement.

In the invention, preferably, the fly ash is F-I class fly ash.

In the invention, when the F-I grade fly ash is selected, because the fineness of the F-I grade fly ash is 45 mu m and the sieve residue of the square hole sieve is not more than 12 percent and the water content is 0.8 percent, the layering degree of the mixed slurry can be reduced, the strength of the mixed slurry is increased, and the mixed slurry with better performance is obtained.

In the present invention, preferably, the bentonite is sodium bentonite.

More preferably, the sodium bentonite has the specific gravity of less than or equal to 1.14 and the viscosity of more than or equal to 22.5S.

Most preferably, the sodium bentonite is sodium bentonite with the specific gravity of less than or equal to 1.14 and the viscosity of more than or equal to 22.5S in a non-foaming state.

Tests show that the selection of different bentonites has certain influence on the performance of the obtained mixed slurry. When the bentonite is sodium bentonite with the specific gravity less than or equal to 1.14 and the viscosity more than or equal to 22.5S, the performance of the obtained mixed slurry is better; and when the bentonite is sodium bentonite with the specific gravity less than or equal to 1.14 and the viscosity more than or equal to 22.5S in a non-foaming state, the performance of the obtained mixed slurry is more excellent.

In the present invention, preferably, the slurry is a slurry produced by construction.

More preferably, the slurry is a slurry produced by construction with a specific gravity of 1.35, a solid content of 44.4%, a sand content of 16.5% and a viscosity of 21.12S.

More preferably, the slurry is a slurry produced by construction having a specific gravity of 1.3, a solid content of 38.6%, a sand content of 4.5% and a viscosity of 17S.

A preparation method of slurry mixed slurry is characterized in that cement, slurry, fly ash and bentonite in parts by weight are put into a stirring device and are uniformly stirred.

Compared with the prior art, the invention has the beneficial effects that:

the slurry discharged from a construction site is fully utilized, the slurry is fully stirred and mixed with cement, fly ash and bentonite to form mixed slurry, the slurry is in a pasty state by utilizing the water absorption and the expansibility of the bentonite, and the slurry generated by construction is used for replacing water, is absorbed and recycled, and is energy-saving and environment-friendly; the mixed slurry has certain strength, can be used as a cement slurry in a pile planting method, can also be used as an earthwork backfill material to harden the ground, and is widely used in the field of building construction.

Drawings

FIG. 1 is a graph showing the tendency of the spread of a slurry mixture according to the present invention as a function of various factors.

FIG. 2 is a graph showing the tendency of setting time of a slurry mixture according to the present invention according to various factors.

FIG. 3 is a graph showing the variation of density with various factors for a slurry mixture according to the present invention.

FIG. 4 is a graph showing the variation of consistency of a slurry mixture according to the present invention as a function of factors.

FIG. 5 is a graph showing the variation of the degree of stratification of a slurry mixture according to the present invention as a function of various factors.

FIG. 6 is a graph showing the variation of the bleeding rate of a slurry mixture according to the present invention with various factors.

FIG. 7 is a graph showing the trend of water retention of a slurry mixture according to the present invention as a function of various factors.

FIG. 8 is a graph showing the strength of a slurry mixture according to the present invention as a function of various factors.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

the mixed slurry provided in this example comprises the following raw materials in parts by weight in table 1:

TABLE 1

The raw materials in the table 1 are stirred and mixed evenly.

Example 2:

the mixed slurry provided in this example comprises the following raw materials in parts by weight in table 2:

TABLE 2

The raw materials in the table 2 are stirred and mixed evenly.

Example 3:

the mixed slurry provided in this example comprises the following raw materials in parts by weight in table 3:

TABLE 3

The raw materials in the table 3 are stirred and mixed evenly.

Example 4:

the mixed slurry provided in this example comprises the following raw materials in parts by weight in table 4:

TABLE 4

The raw materials in table 4 were stirred and mixed uniformly.

Example 5:

the mixed slurry provided in this example comprises the following raw materials in parts by weight in table 5:

TABLE 5

The raw materials in Table 5 were mixed and stirred uniformly.

Example 6:

this example provides a blended slurry having the same composition as example 1, except that P.O 42.5.5 cement was used.

Example 7:

the composition of the mixed slurry provided in this example was the same as that of example 3, except that class F-I fly ash was used, the fineness (45 μm square mesh sieve residue) was not more than 12%, and the water content was 0.8%.

Example 8:

the components of the mixed slurry provided by the embodiment are the same as those of the embodiment 3, except that sodium bentonite is adopted, the specific gravity is less than or equal to 1.14, and the viscosity is more than or equal to 22.5S.

Example 9:

the components of the mixed slurry provided by the embodiment are the same as those of the embodiment 3, except that sodium bentonite is adopted, the specific gravity is less than or equal to 1.14, the viscosity is more than or equal to 22.5S, and the sodium bentonite is in a non-foaming state.

Comparative example 1:

the components of the mixed slurry provided in this example are, referring to example 3, different from example 3 in that bentonite is not contained, that is, the specific composition is as follows:

TABLE 6

The raw materials in Table 6 were mixed and stirred uniformly.

Test example 1:

this test example was examined on the properties of the mixed slurry of the inventive example and the comparative example.

The test example was carried out according to JGJ/T70-2009 Standard test method for basic Performance of building mortar, and the results are shown in Table 7:

TABLE 7

As can be seen from the results of table 7: compared with the example 3 of the present invention, the mixed slurry of the comparative example 1 has a larger influence on the performance of the mixed slurry due to the addition of bentonite, and the mixed slurry without the addition of bentonite has a higher bleeding rate, a long setting time, a large extension degree and poor overall performance. In example 6 of the present invention, in the case where the other components are the same, when the cement is P.O 42.5.5 cement, the strength of the mixed slurry is greater and the setting time is short; when F-I class fly ash is selected, the fineness (the screen residue of a 45-micron square-hole sieve) is less than or equal to 12 percent, and the water content is 0.8 percent, the layering degree of the mixed slurry is reduced, and the strength is increased; when the sodium bentonite with the specific gravity less than or equal to 1.14 and the viscosity more than or equal to 22.5S is selected, the overall performance of the mixed slurry is improved; when the sodium bentonite with the specific gravity of less than or equal to 1.14 and the viscosity of more than or equal to 22.5S and in a non-foaming state is selected, the obtained mixed slurry has good expansibility, no layering, high strength and better performance, and the overall performance is more suitable for construction.

The slurry mixed slurry provided by the invention can be obtained by only putting cement, slurry, fly ash and bentonite in the stirring device according to the weight parts and uniformly stirring, and adopting the slurry generated by construction and mixing the cement, the fly ash and the bentonite in a certain proportion.

Test example 2

In this test example, the influence relationship between the respective raw materials of the slurry and the extension degree, setting time, density, consistency, layering degree, bleeding rate, water retentivity, and strength of the mixed slurry was determined by an orthogonal test.

Because the mixed slurry comprises four components of cement, slurry, fly ash and bentonite, the relation between the components and various parameters of the mixed slurry is unknown, the relation is determined by tests, the required test period is long, and the input cost is high, so an orthogonal test method is adopted, the expansion degree, the setting time, the density, the consistency, the layering degree, the bleeding rate, the water retention property and the strength of the mixed slurry are determined as indexes, the slurry, the fly ash and the bentonite are three factors which have influence on the indexes, the weight part of each factor is the level, and the factors and the corresponding level values are shown in a table 8:

TABLE 8

Orthogonal table L corresponding to orthogonal test₁₆(4⁴) As shown in table 9:

and respectively preparing mixed slurry according to the tables, testing indexes of the mixed slurry, and calculating and analyzing data in the tables by adopting range analysis to calculate the influence degree of each factor on the indexes.

TABLE 9

The results of the tests according to table 9 are shown in table 10 for the results of the cross-section analysis of the mixed slurry:

watch 10

From Table 10, it can be seen that the amount of bentonite whose worst value R is the greatest affects the spreadability of the mixed slurry, whereas the amount of bentonite whose worst value R is the smallest affects the slurry, and the ratio of the greatest spreadability is A₁B₁C₁D₃Namely 20 weight portions of bentonite and 0 weight portion of fly ashThe weight portion, the specific gravity of the slurry is 1.25, the mixing amount of the slurry is 300 weight portions, and the tendency of the spread degree along with various factors shown in figure 1 can be obtained and is used as reference data in the mixed slurry test.

The mud weight which has the greatest influence on the setting time of the mixed slurry can be obtained according to the same test and calculation, and the ratio of the maximum setting time is A₁B₄C₁D₃Namely, the mixing amount of bentonite is 20 parts by weight, the mixing amount of fly ash is 30 parts by weight, the specific gravity of the slurry is 1.25 parts by weight, the mixing amount of the slurry is 300 parts by weight, and the change trend of the setting time of the mixed slurry along with various factors is shown in figure 2.

The same can be obtained that the mud proportion with the largest influence on the density of the mixed slurry is the mud proportion, and the proportion with the largest density is A₄B₃C₄D₁Namely, the bentonite content is 41 parts by weight, the fly ash content is 20 parts by weight, the mud proportion is 1.4, the mud content is 260 parts by weight, and the variation trend of the density of the mixed slurry along with various factors is shown in figure 3.

The most significant effect on the consistency of the mixed slurry is the mud weight, the ratio of the maximum consistency being A₁B₁C₁D₃Namely, the mixing amount of bentonite is 20 parts by weight, the mixing amount of fly ash is 0 part by weight, the specific gravity of the slurry is 1.25 parts by weight, the mixing amount of the slurry is 300 parts by weight, and the variation trend of the consistency of the mixed slurry along with various factors is shown in figure 4.

The most influential to the degree of delamination of the mixed slurry is the blending amount of fly ash, and the ratio of the degree of delamination is A₄B₃C₂D₃Namely, the bentonite content is 41 parts by weight, the fly ash content is 20 parts by weight, the mud proportion is 1.3, the mud content is 300 parts by weight, and the change trend of the delamination degree of the mixed slurry along with various factors is shown in figure 5.

The ratio A which has the greatest influence on the bleeding rate of the mixed slurry is the specific gravity of the slurry and the bleeding rate₁B₁C₁D₁Namely 20 weight portions of bentonite, 0 weight portion of fly ash, 1.25 weight portions of mud, 260 weight portions of mud, and the bleeding rate of the mixed slurry has the same change trend with various factors asAs shown in fig. 6.

The mud weight which has the greatest influence on the water retention of the mixed slurry is the mud weight, and the mud weight with the greatest water retention is A₄B₁C₂D₃Namely, the bentonite content is 41 parts by weight, the fly ash content is 0 part by weight, the mud specific gravity is 1.3, and the mud content is 300 parts by weight, and the water retention of the mixed slurry is shown in the change trend along with various factors in fig. 7.

The strength of the mixed slurry changes along with the change of time, the test data is the 28-day strength of the mixed slurry, the largest influence is the mud specific gravity, and the ratio of the 28-day strength to the maximum is A₁B₄C₄D₁Namely, the bentonite content is 20 parts by weight, the fly ash content is 30 parts by weight, the mud proportion is 1.4, the mud content is 260 parts by weight, and the 28-day strength of the mixed slurry changes with various factors, as shown in fig. 8.

Further, referring to the data and tables obtained by the orthogonal test, wherein the specific gravity of the slurry has an influence on the performance index of the mixed slurry, in order to ensure that the comprehensive performance of the mixed slurry is optimal, in the embodiment 1 and the embodiment 6, the specific gravity of the slurry is 1.35, the solid content is 44.4%, the sand content is 16.5%, and the viscosity is 21.12S; in example 2, the mud had a specific gravity of 1.3, a solid content of 38.6%, a sand content of 4.5%, and a viscosity of 17S; in example 3 and examples 7 to 9, the mud had a specific gravity of 1.4, a solid content of 47.7%, a sand content of 16.0%, and a viscosity of 24.45S; in example 4, the slurry had a specific gravity of 1.4, a solid content of 42.3%, a sand content of 11%, and a viscosity of 24.5S; in example 5, the slurry had a specific gravity of 1.35, a solid content of 44.4%, a sand content of 16.5% and a viscosity of 21.12S.

The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.