CN112250412B - Method for curing high-viscosity residue soil to be used as backfill material - Google Patents
Method for curing high-viscosity residue soil to be used as backfill material Download PDFInfo
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- CN112250412B CN112250412B CN202011202657.8A CN202011202657A CN112250412B CN 112250412 B CN112250412 B CN 112250412B CN 202011202657 A CN202011202657 A CN 202011202657A CN 112250412 B CN112250412 B CN 112250412B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a method for curing high-viscosity residue soil to be used as backfill, which comprises the following steps: s1, weighing high-viscosity residue soil, and testing the water content; s2, adding water with the water content being 5-15 percent higher than the water content according to the obtained water content, and stirring the mixture to be uniform to form slurry; s3, adding a curing agent with the weight percent of less than 6.1 into the slurry, and uniformly stirring to obtain a cured backfill material; the curing agent consists of: granulated blast furnace slag, quicklime, sodium carbonate, sodium silicate and gypsum; the invention overcomes the problem that the high-viscosity residue soil is difficult to be uniformly mixed with the curing agent by adjusting the amount of externally added water in the residue soil, and the residue soil is softened and loosened after being soaked in water, so that the residue soil is fully contacted with the curing agent and is uniformly stirred, the 3d compressive strength of the cured backfill can reach more than 0.8MPa, and the requirement of backfill soil is met; the invention does not need to be matched with cement for use, can shorten the backfill construction period, has low curing cost and has high economic benefit and environmental benefit.
Description
Technical Field
The invention relates to the technical field of high-viscosity residue soil treatment, in particular to a method for curing high-viscosity residue soil to be used as a backfill material.
Background
At present, the construction of subways and other infrastructures (such as urban comprehensive pipe galleries, pipe networks, underground quick passages, pipe jacking construction and the like) in China is rapid in development, large in construction scale and high in construction speed. The shield method is an interval tunnel construction method which is recognized as excellent by the industry due to the advantages of safety, high efficiency, strong stratum adaptability and the like, and a large amount of shield muck is generated inevitably. For the hard rock TBM tunneling shield muck and the mud water balance shield muck, the resource disposal process is mature, and the resource utilization difficulty is relatively small; however, earth and stone mixed muck or soil layer muck, such as earth pressure balance shield muck, is in a paste shape, and dehydration and screening are extremely difficult, so that the resource utilization difficulty is increased, the additional value is reduced, and the existing disposal mode is generally abandoned in the open air. Particularly, for some soft and sticky shield muck containing more sticky particles, the problems of softening in water, higher viscosity and the like exist, the open storage harmfulness is higher, the high-valued utilization difficulty is higher or the cost is higher.
In conclusion, a fast and efficient method for disposing high-viscosity residue soil is needed. If the high-viscosity slag soil is solidified and used as backfill materials such as a station roof and the like, the high-viscosity slag soil is treated on site and backfilled, and the added value of the high-viscosity slag soil is improved. The existing curing method has long curing time and poor curing effect on high-viscosity residue soil containing more sticky particles, and the basic curing backfill strength can be achieved only after 7 days, so that the synchronous backfill is difficult to realize, and the resource utilization benefit is reduced. Therefore, if the high-viscosity residue soil is quickly and efficiently solidified to be used as the backfill material, the residue soil disposal cost is saved, and higher economic benefit and environmental benefit are obtained, which has important significance.
Disclosure of Invention
The invention aims to solve the problems that high-viscosity residue soil is difficult to dispose, the existing curing mode has poor curing effect, long time and high cost, and high-value resource utilization is difficult.
In order to solve the technical problems, the invention provides a method for solidifying high-viscosity residue soil to be used as a backfill material, which comprises the following specific scheme:
a method for solidifying high-viscosity muck used as backfill material comprises the following steps:
s1, weighing the high-viscosity residue soil, and testing the water content of the residue soil;
s2, adding water which is 5-15 percent higher than the water content of the high-viscosity residue soil according to the water content obtained in the step S1, and stirring the mixture to be uniform to form slurry;
s3, adding a curing agent with the weight percent of less than 6.1 percent into the uniform slurry prepared in the step S2, and uniformly stirring to obtain a cured backfill material;
wherein, the content of sticky particles with the grain diameter less than 5 μm in the high-viscosity residue soil is more than 30 percent, and the viscosity is more than 5000 Pa.S; the curing agent comprises the following components in parts by weight:
in some embodiments, the high viscosity residue has a content of clay particles with a particle size of less than 5 μm of 35% or more and a content of particles with a particle size of 75 μm of 85% or more.
In some embodiments, the high viscosity muck has a moisture content of 18-35%.
In some embodiments, the curing agent is added into the uniform slurry and stirred uniformly, and after natural curing for 3d at room temperature, the compressive strength of the cured backfill reaches over 0.8MPa, so that the backfill requirement is met.
In some embodiments, the mesh size of the granulated blast furnace slag is 200-400 mesh.
In some embodiments, the quicklime has a calcium content of > 90% and a fineness of 200 mesh with a pass rate of > 70%.
In some embodiments, the sodium carbonate is a solid powder with a mesh size of 150-200.
In some embodiments, the sodium silicate is a white solid powder with a modulus of 2.3-3.0, a fineness of 100 mesh, and a dissolution time of 220 s.
In some embodiments, the gypsum has a mesh size of 300-400 mesh and a whiteness of greater than 90%.
Preferably, the high-viscosity residue soil is residue soil dug in a subway shield region or a vehicle station.
Preferably, in step S2, the high viscosity residue soil is broken up and stirred uniformly by low speed stirring, and the stirring speed is 45 r/min.
Preferably, in step S3, the curing agent and the residual soil are fully mixed and stirred uniformly by high-speed stirring, and the stirring speed is 120 r/min.
Compared with the prior art, the invention has the beneficial effects that:
before the high-viscosity residue soil is mixed with the curing agent, the problem that the high-viscosity residue soil is difficult to be uniformly mixed with the curing agent is solved by adding corresponding water amount, so that the high-viscosity residue soil is softened and loosened after being soaked in water, fully contacts with the curing agent and is uniformly stirred, the curing effect is improved, and under the condition that the mixing amount of the curing agent is lower (less than 6.1 wt%), the compressive strength of a prepared test piece can reach more than 0.8MPa after natural curing for 3 days at room temperature, and can reach more than 1.2MPa after 7 days, so that the strength requirement of backfill soil is met. Compared with the existing curing method, the curing method has the advantages of long curing time, high cost and poor curing effect, the curing method has the characteristics of high curing strength, high curing speed and good curing effect, can realize synchronous backfilling on a construction site, shortens the backfilling construction period, has low curing cost, solves the problems of difficult disposal and high-value resource utilization of high-viscosity muck, and has high economic benefit and environmental benefit.
The invention also has the following advantages:
(1) the curing effect is superior to that of PO42.5 cement without being matched with the cement, the basic backfill strength requirement can be met after natural curing for 3d, the construction period can be shortened, and the high-efficiency environment-friendly effect is realized;
(2) the characteristic that the high-viscosity residue soil is softened when meeting water is fully utilized, and the problem that the residue soil is difficult to be uniformly mixed with the curing agent is solved by additionally adding corresponding water amount into the residue soil, so that the residue soil is softened and expanded after being soaked in water to form a loose state, and is fully contacted with the curing agent and uniformly stirred, and the curing effect is improved;
(3) the curing cost of each formula of muck is within 85 yuan, and compared with the current disposal cost of the mudstone muck on a construction site, the cost of each formula is 150 yuan or more, and the economic benefit is obvious.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a graph showing the particle size distribution of highly viscous muck (mudstone muck) used in examples 1 to 3 of the present invention and comparative examples 1 to 7.
FIG. 2 is an XRD spectrum of a shale residue used in examples 1 to 3 of the present invention and comparative examples 1 to 7.
FIG. 3 is a uniaxial compressive stress-strain curve diagram of a solidified test piece made of mudstone muck in example 1 of the present invention and naturally cured at room temperature for 3d and 7 d.
FIG. 4 is a uniaxial compressive stress-strain curve diagram of a solidified test piece made of mudstone muck in example 2 of the present invention and naturally cured at room temperature for 3d and 7 d.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The concrete embodiment, the examples and the comparative example show that the mudstone muck (high-viscosity muck) is taken from undisturbed muck material in a certain interval of a No. 5 line secondary work area of Nanning subway, and the initial water content is measured to be 22%. As shown in FIG. 1, it can be seen that the content of clay particles (calculated as particles smaller than 5 μm) is 45% and the content of particles smaller than 75 μm is 94% for the particle size distribution curve of the mudstone muck, resulting in higher viscosity. The highest viscosity value of the product is 8205 Pa.S at the rotating speed of 60 r/min under the condition of room temperature through the test of a rheometer. As shown in fig. 2, the XRD spectrum shows that the main mineral components are quartz, mica, kaolinite and chlorite; through tests, the main chemical components and the proportion are respectively SiO2：62.7％，Al2O3：19.0％，Fe2O3：9.93％。
The following specific embodiments, examples and comparative examples used curative components with the following specific parameters:
the mesh number of the granulated blast furnace slag is 200; the fineness of the quicklime is 80 percent of the passing rate of 200 meshes, and the calcium content is 91 percent; the mesh number of the sodium carbonate is 150; sodium silicate powder with modulus of 2.85 and fineness of 98.5 percent of 100-mesh sieve rate; the mesh number of the gypsum is 300, and the whiteness is 95%.
Before the curing agent is doped, the corresponding water amount is added into the residue soil to overcome the problem that the high-viscosity residue soil is difficult to be uniformly mixed with the curing agent, so that the residue soil is softened and loosened after being soaked in water, and is fully contacted with the curing agent and uniformly stirred.
Therefore, the study of the optimum water content was included. Meanwhile, in order to ensure the curing cost, granulated blast furnace slag, quicklime, sodium carbonate and sodium silicate are selected as curing agents firstly, and the following steps are carried out:
taking 2000g of mudstone muck, and respectively adding the materials in the following ratio (1): 800g of water, (2): 600g of water, (3): 400g of water, (4): 350g of water, (5): 300g of water, (6): 250g of water, (7): 200g of water is uniformly stirred by a small-sized stirrer at the speed of 45r/min, then 116g of curing agent is added and uniformly stirred at the speed of 120r/min to obtain the final curing material, the final curing material is poured into a 70.7 x 70.7mm triple die, and after natural curing for 7d at room temperature, the uniaxial compressive strength is tested. Wherein the curing agent consists of 80g of granulated blast furnace slag, 20g of quicklime, 10g of sodium carbonate and 6g of sodium silicate powder which are uniformly stirred.
The tested 7d compressive strengths of the groups (1) to (7) are 0.100MPa, 0.423MPa, 0.445MPa, 0.460MPa, 0.587MPa, 0.770MPa and 0.993MPa, respectively. The 3d compressive strengths of group (6) and group (7) were 0.657MPa and 0.743MPa, respectively.
From the above results, it can be seen that the 7d compressive strength of the group (6) is close to 0.8MPa, the 7d compressive strength of the group (7) exceeds 0.8MPa, but the 3d compressive strengths thereof are all lower than 0.8MPa, and the basic strength requirement of the backfill material cannot be satisfied.
The aims of further improving the curing strength of the mudstone muck, increasing the gypsum and optimizing the components and the mixing proportion of the curing agent on the premise of ensuring the maximum water mixing amount and stirring effect and the curing cost are fulfilled, so as to achieve the best curing effect.
To further specifically illustrate the method of solidifying the high viscosity residue soil used as backfill material proposed by the present invention, the following examples are given for the detailed description.
Example 1
2000g of undisturbed mudstone muck is taken, and the initial water content is measured to be 22%. Weighing 80g of granulated blast furnace slag, 20g of quicklime, 10g of sodium carbonate, 6g of sodium silicate and 5g of gypsum, and uniformly mixing and stirring for later use. In addition, 200g of water was weighed.
A method for solidifying high-viscosity dregs to be used as backfill material comprises the following steps:
s1, weighing 2000g of high-viscosity muck, and testing the water content to be 22%;
s2, adding water (200g) which is 12.2 percent higher than the water content of the mudstone muck according to the water content obtained in the step S1, and stirring the mixture to be uniform at a speed of 45 r/min;
s3, adding 6.05 percent (121g) of curing agent in percentage by weight into the uniform muck in the step S2, and stirring the mixture to be uniform at the speed of 120r/min to obtain the cured backfill material.
The cured backfill from step S3 was poured into a 70.7 x 70.7mm cubic triple mold. The test shows that the 3d and 7d average compressive strengths are 0.997MPa and 1.202MPa respectively. As shown in FIG. 3, FIG. 3 is a graph showing uniaxial compressive stress-strain curves of the high-viscosity residue soil cured backfill test piece of example 1 after natural curing at room temperature for 3d and 7 d.
Example 2
2000g of undisturbed mudstone muck is taken, and the initial water content is measured to be 22%. 70g of granulated blast furnace slag, 20g of quicklime, 10g of sodium carbonate, 6g of sodium silicate and 7.5g of gypsum are weighed and mixed uniformly for later use. In addition, 200g of water was weighed.
A method for solidifying high-viscosity dregs to be used as backfill material comprises the following steps:
s1, weighing 2000g of high-viscosity muck, and testing the water content to be 22%;
s2, adding water (200g) which is 12.2 percent higher than the water content of the mudstone muck according to the water content obtained in the step S1, and stirring the mixture to be uniform at a speed of 45 r/min;
s3, adding 5.675% (113.5g) of curing agent in percentage by weight into the uniform muck in the step S2, and stirring at a speed of 120r/min until the mixture is uniform to obtain the cured backfill material.
The cured backfill from step S3 was poured into a 70.7 x 70.7mm cubic triple mold. The test shows that the 3d and 7d average compressive strengths are 0.890MPa and 1.280MPa respectively. As shown in FIG. 4, FIG. 4 is a graph showing uniaxial compressive stress-strain curves of the high-viscosity residue soil cured backfill test piece of example 2 after natural curing at room temperature for 3d and 7 d.
Example 3
2000g of undisturbed shale muck is taken, and the initial water content is measured to be 22%. 70g of granulated blast furnace slag, 20g of quicklime, 10g of sodium carbonate, 6g of sodium silicate and 10g of gypsum are weighed and mixed uniformly for later use. In addition, 200g of water was weighed.
A method for solidifying high-viscosity dregs to be used as backfill material comprises the following steps:
s1, weighing 2000g of high-viscosity muck, and testing the water content to be 22%;
s2, adding water (200g) which is 12.2 percent higher than the water content of the mudstone muck according to the water content obtained in the step S1, and stirring the mixture to be uniform at a speed of 45 r/min;
s3, adding 5.80 percent (116g) of curing agent in percentage by weight into the uniform muck in the step S2, and stirring the mixture to be uniform at the speed of 120r/min to obtain the cured backfill material.
And (5) pouring the cured backfill obtained in the step S3 into a cubic triple die with the thickness of 70.7 x 70.7mm, and naturally curing at room temperature. The test shows that the 7d average compression strength is 1.095 MPa.
Comparative example 1
2000g of undisturbed mudstone muck is taken, and the initial water content is measured to be 22%. Weighing 80g of granulated blast furnace slag, 20g of quicklime, 10g of sodium carbonate, 6g of sodium silicate and 5g of gypsum, and uniformly mixing and stirring for later use. In addition, 400g of water was weighed.
A method for solidifying high-viscosity dregs to be used as backfill material comprises the following steps:
s1, weighing 2000g of high-viscosity muck, and testing the water content to be 22%;
s2, adding water (400g) which is 24.4 percent higher than the water content of the mudstone muck according to the water content obtained in the step S1, and stirring at the speed of 45r/min to be uniform;
s3, adding 6.05 percent (121g) of curing agent in percentage by weight into the uniform muck in the step S2, and stirring the mixture to be uniform at the speed of 120r/min to obtain the cured backfill material.
And (5) pouring the cured backfill obtained in the step S3 into a cubic triple die with the thickness of 70.7 x 70.7mm, and naturally curing at room temperature. The test shows that the 7d average compression strength is 0.643 MPa.
Comparative example 2
2000g of undisturbed mudstone muck is taken, and the initial water content is measured to be 22%. Weighing 80g of granulated blast furnace slag, 20g of quicklime, 10g of sodium carbonate, 6g of sodium silicate and 5g of gypsum, and uniformly mixing and stirring for later use. In addition, 300g of water was weighed.
A method for solidifying high-viscosity dregs to be used as backfill material comprises the following steps:
s1, weighing 2000g of high-viscosity muck, and testing the water content to be 22%;
s2, adding water (300g) which is 18.3 percent higher than the water content of the mudstone muck according to the water content obtained in the step S1, and stirring the mixture to be uniform at a speed of 45 r/min;
s3, adding 6.05 percent (121g) of curing agent in percentage by weight into the uniform muck in the step S2, and stirring the mixture to be uniform at the speed of 120r/min to obtain the cured backfill material.
And (5) pouring the cured backfill obtained in the step S3 into a cubic triple die with the thickness of 70.7 x 70.7mm, and naturally curing at room temperature. The 7d average compression strength of the steel is 0.830MPa after testing.
Comparative example 3
2000g of undisturbed mudstone muck is taken, and the initial water content is measured to be 22%. Weighing 80g of granulated blast furnace slag, 20g of quicklime, 10g of sodium carbonate, 6g of sodium silicate and 5g of gypsum, and uniformly mixing and stirring for later use. In addition, 250g of water was weighed.
A method for solidifying high-viscosity dregs to be used as backfill material comprises the following steps:
s1, weighing 2000g of high-viscosity muck, and testing the water content to be 22%;
s2, adding water (250g) which is 15.3 percent higher than the water content of the mudstone muck according to the water content obtained in the step S1, and stirring at the speed of 45r/min to be uniform;
s3, adding 6.05 percent (121g) of curing agent in percentage by weight into the uniform muck in the step S2, and stirring the mixture to be uniform at the speed of 120r/min to obtain the cured backfill material.
And (5) pouring the cured backfill obtained in the step S3 into a cubic triple die with the thickness of 70.7 x 70.7mm, and naturally curing at room temperature. The test shows that the 7d average compression strength is 0.935 MPa.
Comparative example 4
2000g of undisturbed mudstone muck is taken, and the initial water content is measured to be 22%. 70g of granulated blast furnace slag, 20g of quicklime, 10g of sodium carbonate, 6g of sodium silicate and 7.5g of gypsum are weighed and mixed uniformly for later use. In addition, 400g of water was weighed.
A method for solidifying high-viscosity dregs to be used as backfill material comprises the following steps:
s1, weighing 2000g of high-viscosity muck, and testing the water content to be 22%;
s2, adding water (400g) which is 24.4 percent higher than the water content of the mudstone muck according to the water content obtained in the step S1, and stirring at the speed of 45r/min to be uniform;
s3, adding 5.675% (113.5g) of curing agent in percentage by weight into the uniform muck in the step S2, and stirring at a speed of 120r/min until the mixture is uniform to obtain the cured backfill material.
And (5) pouring the cured backfill obtained in the step S3 into a cubic triple die with the thickness of 70.7 x 70.7mm, and naturally curing at room temperature. The test shows that the 7d average compression strength is 0.470 MPa.
Comparative example 5
2000g of undisturbed mudstone muck is taken, and the initial water content is measured to be 22%. 70g of granulated blast furnace slag, 20g of quicklime, 10g of sodium carbonate, 6g of sodium silicate and 7.5g of gypsum are weighed and mixed uniformly for later use. In addition, 300g of water was weighed.
A method for solidifying high-viscosity dregs to be used as backfill material comprises the following steps:
s1, weighing 2000g of high-viscosity muck, and testing the water content to be 22%;
s2, adding water (300g) which is 18.3 percent higher than the water content of the mudstone muck according to the water content obtained in the step S1, and stirring the mixture to be uniform at a speed of 45 r/min;
s3, adding 5.675% (113.5g) of curing agent in percentage by weight into the uniform muck in the step S2, and stirring at a speed of 120r/min until the mixture is uniform to obtain the cured backfill material.
And (5) pouring the cured backfill obtained in the step S3 into a cubic triple die with the thickness of 70.7 x 70.7mm, and naturally curing at room temperature. The 7d average compressive strength of the steel is 0.853 MPa.
Comparative example 6
2000g of undisturbed mudstone muck is taken, and the initial water content is measured to be 22%. Weighing 70g of granulated blast furnace slag, 20g of quicklime, 10g of sodium carbonate, 6g of sodium silicate and 7.5g of gypsum, and uniformly mixing and stirring for later use. In addition, 250g of water was weighed.
A method for solidifying high-viscosity dregs to be used as backfill material comprises the following steps:
s1, weighing 2000g of high-viscosity muck, and testing the water content to be 22%;
s2, adding water (250g) which is 15.3 percent higher than the water content of the mudstone muck according to the water content obtained in the step S1, and stirring at the speed of 45r/min to be uniform;
s3, adding 5.675% (113.5g) of curing agent in percentage by weight into the uniform muck in the step S2, and stirring at a speed of 120r/min until the mixture is uniform to obtain the cured backfill material.
And (5) pouring the cured backfill obtained in the step S3 into a cubic triple die with the thickness of 70.7 x 70.7mm, and naturally curing at room temperature. The test shows that the 7d average compressive strength is 0.913 MPa.
Comparative example 7
2000g of undisturbed mudstone muck is taken, and the initial water content is measured to be 22%. 70g of granulated blast furnace slag, 20g of quicklime, 10g of sodium carbonate, 6g of sodium silicate and 10g of gypsum are weighed and mixed uniformly for later use. In addition, 250g of water was weighed.
A method for solidifying high-viscosity dregs to be used as backfill material comprises the following steps:
s1, weighing 2000g of high-viscosity muck, and testing the water content to be 22%;
s2, adding water (250g) which is 15.3 percent higher than the water content of the mudstone muck according to the water content obtained in the step S1, and stirring at the speed of 45r/min to be uniform;
s3, adding 5.80 percent (116g) of curing agent in percentage by weight into the uniform muck in the step S2, and stirring the mixture to be uniform at the speed of 120r/min to obtain the cured backfill material.
And (5) pouring the cured backfill obtained in the step S3 into a cubic triple die with the thickness of 70.7 x 70.7mm, and naturally curing at room temperature. The test shows that the 7d average compressive strength is 0.993 MPa.
According to the results of the examples 1-3 and the comparative examples 1-7, the optimal water doping amount is the additional water which is 5-15 percent higher than the moisture content of the residue soil, and the test piece prepared by the water doping amount can be naturally cured at room temperature for 3d to be more than 0.8MPa, so that the backfill strength requirement is met. The water content is too much, so that the stirring is more sufficient, but the hydration reaction is hindered, and the strength of the solidified residue soil test piece is reduced; the added water mixing amount is reduced, and the compression strength of the test piece can be greatly improved; when the moisture content is too low, the high-viscosity side effect of the muck is obvious, so that the curing agent and the muck are difficult to mix and stir uniformly, the curing effect is poor, and the basic strength requirement cannot be met. Meanwhile, the double action of the gypsum is obvious for high-viscosity residue soil with high content of sticky particles. The gypsum is mixed in a certain range, free water is consumed in the hydration reaction process, hydration products fill the pores in the soil body, and soil particles are cemented, so that the strength of the solidified soil is improved. When the mixing amount of the gypsum is continuously increased, the generated expansive hydration product is easy to damage the existing net structure of the solidified soil body, so that the strength of the solidified soil body is not increased or decreased.
Further, the effect of the high-viscosity residue soil of the present invention as a backfill material by curing and the economy will be described in detail.
Comparative example 8
2000g of undisturbed mudstone muck is taken, and the initial water content is measured to be 22%. 121g of PO42.5 cement was weighed out for use, based on the weight of the curing agent in example 1. In addition, 200g of water was weighed.
A method for solidifying high-viscosity dregs to be used as backfill material comprises the following steps:
s1, weighing 2000g of high-viscosity muck, and testing the water content to be 22%;
s2, adding water (200g) which is 12.2 percent higher than the water content of the mudstone muck according to the water content obtained in the step S1, and stirring the mixture to be uniform at a speed of 45 r/min;
s3, adding 6.05 percent (121g) of PO42.5 cement in percentage by weight into the uniform muck in the step S2, and stirring the mixture to be uniform at the speed of 120r/min to obtain the solidified backfill.
The cured backfill from step S3 was poured into a 70.7 x 70.7mm cubic triple mold. The test shows that the average compression strength after natural curing for 3d and 7d at room temperature is 0.547MPa and 0.930MPa respectively.
Comparative example 9
2000g of undisturbed mudstone muck is taken, and the initial water content is measured to be 22%. The weight of PO42.5 cement reduced to the same price was 166.3g, and 166.3g of PO42.5 cement was weighed out for use, referring to the cost of the curing agent in example 1. In addition, 200g of water was weighed.
A method for solidifying high-viscosity dregs to be used as backfill material comprises the following steps:
s1, weighing 2000g of high-viscosity muck, and testing the water content to be 22%;
s2, adding water (200g) which is 12.2 percent higher than the water content of the mudstone muck according to the water content obtained in the step S1, and stirring the mixture to be uniform at a speed of 45 r/min;
s3, adding 8.315% (166.3g) of the mixture in percentage by weight into the uniform muck obtained in the step S2, and stirring the mixture at a speed of 120r/min until the mixture is uniform, thereby obtaining the solidified backfill.
The cured backfill from step S3 was poured into a 70.7 x 70.7mm cubic triple mold. Tests show that the average compressive strength of the steel is 0.710MPa and 0.992MPa after natural curing for 3 days and 7 days at room temperature.
It can be seen that the 3d compressive strength of comparative examples 8 and 9 is less than 0.8MPa, and the 7d strength can reach 0.8MPa, but the curing effect and the economical efficiency are inferior to those of examples 1, 2 and 3 of the present invention.
In conclusion, the invention has the following advantages:
(1) the curing agent is not required to be matched with cement for use, the curing effect is superior to that of PO42.5 cement, the curing time can reach more than 0.8MPa after natural curing for 3d, the basic strength requirement of the backfill material is met, the curing speed is high, the construction period is favorably shortened, and the curing agent is efficient and environment-friendly.
(2) The characteristics of high-viscosity residue soil softened by water are fully utilized, the problem that the residue soil is difficult to be uniformly mixed with the curing agent is solved by additionally adding water into the residue soil, and the residue soil is softened and expanded after being soaked in water to form a loose state, so that the residue soil is fully contacted with the curing agent and uniformly stirred, and the curing effect is improved.
(3) The curing cost of each formula of muck is within 85 yuan, and compared with the current disposal cost of the mudstone muck on a construction site, the cost of each formula is 150 yuan or more, and the economic benefit is obvious.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
Claims (9)
1. A method for solidifying high-viscosity muck used as backfill material is characterized by comprising the following steps:
s1, weighing the high-viscosity residue soil, and testing the water content of the residue soil;
s2, adding water which is 5-15 percent higher than the water content of the high-viscosity residue soil according to the water content obtained in the step S1, and stirring the mixture to be uniform to form slurry;
s3, adding a curing agent with the weight percent of less than 6.1% into the uniform slurry obtained in the step S2, and uniformly stirring to obtain a cured backfill material;
wherein, the content of the sticky particles with the particle size less than 5 μm in the high-viscosity residue soil is more than 30 percent, and the viscosity is more than 5000Pa & S; the curing agent comprises the following components in parts by weight:
2. the method for curing the high-viscosity residue soil used as the backfill according to the claim 1, wherein the content of the sticky particles with the particle size less than 5 μm in the high-viscosity residue soil is more than or equal to 35%, and the content of the particles with the particle size less than or equal to 75 μm is more than or equal to 85%.
3. The method for solidifying the high-viscosity dregs used as the backfill according to the claim 1 or 2, characterized in that in the step S1, the water content of the high-viscosity dregs is 18-35%.
4. The method for curing the high-viscosity residue soil to be used as the backfill according to the claim 1, wherein in the step S3, the curing agent is added into the uniform slurry and stirred uniformly, and after natural curing for 3d at room temperature, the compressive strength of the cured backfill reaches over 0.8MPa, so that the backfill requirement is met.
5. The method for solidifying the high-viscosity slag soil used as the backfill material according to the claim 1, wherein the mesh number of the granulated blast furnace slag is 200-400 meshes.
6. The method for solidifying the high-viscosity residue soil to be used as the backfill material according to the claim 1, wherein the calcium content of the quick lime is more than 90 percent, the fineness is 200 meshes, and the passing rate is more than 70 percent.
7. The method for solidifying the high-viscosity residue soil to be used as the backfill material according to the claim 1, wherein the sodium carbonate is solid powder with the mesh number of 150-200 meshes.
8. The method for curing the high-viscosity residue soil used as the backfill material according to the claim 1, wherein the sodium silicate is white solid powder, the modulus is 2.3-3.0, the fineness is 100 meshes, and the dissolving time is 220 s.
9. The method for curing the high-viscosity residue soil as the backfill material according to the claim 1, wherein the crude gypsum has a mesh number of 300-400 meshes and the whiteness is more than 90%.
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| CN100392042C (en) * | 2005-10-10 | 2008-06-04 | 长安大学 | Soil curing agent of road |
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