CN117401938A - Premixed mortar based on undisturbed shield slag soil and preparation method and application thereof - Google Patents
Premixed mortar based on undisturbed shield slag soil and preparation method and application thereof Download PDFInfo
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- CN117401938A CN117401938A CN202311495182.XA CN202311495182A CN117401938A CN 117401938 A CN117401938 A CN 117401938A CN 202311495182 A CN202311495182 A CN 202311495182A CN 117401938 A CN117401938 A CN 117401938A
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- 239000002893 slag Substances 0.000 title claims abstract description 178
- 239000002689 soil Substances 0.000 title claims abstract description 119
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 106
- 238000002360 preparation method Methods 0.000 title abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 79
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000002994 raw material Substances 0.000 claims abstract description 32
- 239000003513 alkali Substances 0.000 claims abstract description 22
- 239000004568 cement Substances 0.000 claims abstract description 21
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 19
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 46
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 46
- 238000002156 mixing Methods 0.000 claims description 39
- 238000003756 stirring Methods 0.000 claims description 35
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 34
- 239000004115 Sodium Silicate Substances 0.000 claims description 23
- 239000000292 calcium oxide Substances 0.000 claims description 23
- 235000012255 calcium oxide Nutrition 0.000 claims description 23
- DWLAVVBOGOXHNH-UHFFFAOYSA-L magnesium;prop-2-enoate Chemical compound [Mg+2].[O-]C(=O)C=C.[O-]C(=O)C=C DWLAVVBOGOXHNH-UHFFFAOYSA-L 0.000 claims description 23
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 23
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 23
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 23
- 229940048053 acrylate Drugs 0.000 claims description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 239000010881 fly ash Substances 0.000 claims description 11
- 238000005303 weighing Methods 0.000 claims description 11
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 8
- 239000011734 sodium Substances 0.000 claims description 8
- 229910052708 sodium Inorganic materials 0.000 claims description 8
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 229910021487 silica fume Inorganic materials 0.000 claims description 7
- 229940047670 sodium acrylate Drugs 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N Acrylic acid Chemical class OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000012190 activator Substances 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- TXTCTCUXLQYGLA-UHFFFAOYSA-L calcium;prop-2-enoate Chemical compound [Ca+2].[O-]C(=O)C=C.[O-]C(=O)C=C TXTCTCUXLQYGLA-UHFFFAOYSA-L 0.000 claims description 3
- -1 natural pozzolan Inorganic materials 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 10
- 239000002699 waste material Substances 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000004576 sand Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 239000003469 silicate cement Substances 0.000 description 5
- 239000010454 slate Substances 0.000 description 5
- 239000004927 clay Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000005641 tunneling Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to premixed mortar based on undisturbed shield slag soil, and a preparation method and application thereof, wherein the premixed mortar comprises the following raw materials in percentage by mass: 60% -85% of undisturbed shield slag, 10% -40% of alkali-activated cementing material, 0.5% -3% of acrylate gel material, 1% -10% of cement and 3% -15% of water; the ready-mixed mortar provided by the invention can be prepared in time, solves the problem of time connection between the slag discharge of the shield slag soil and the on-site use, is convenient for on-site construction and good in operability, has higher compressive strength, excellent impermeability and water retention performance, small apparent density and low preparation cost, and realizes waste recycling. The invention provides a new method for large-scale treatment and resource utilization of shield slag soil, and has important economic benefit, environmental benefit and social benefit.
Description
Technical Field
The invention belongs to the technical field of building materials and solid waste treatment, and particularly relates to premixed mortar based on undisturbed shield slag soil, and a preparation method and application thereof.
Background
The shield slag soil is generated in order to maintain the stability of the tunnel face in the process of excavating the shield machine, and enters a soil bin after the front soil body is cut by a cutter head, and is transported or pumped into a ground slag soil pool through a screw conveyor, a belt conveyor and a track slag soil truck. The shield tunneling mode is generally selected according to the particle size distribution, permeability coefficient and the like of the crossing stratum, and mainly comprises a slurry balance shield, a soil pressure balance shield and a hard rock TBM shield. The earth pressure balance shield accounts for more than 90%, so that a large amount of shield slag soil can be generated, for example, the slag soil amount generated in cities such as Shenzhen and Wuhan is more than 1 hundred million cubic per year, and the existing disposal mode is basically open air disposal.
In the shield tunneling process, a foaming agent, a high polymer and the like are required to be added to improve the dregs, so that the dregs have certain harm. Meanwhile, the earth pressure balance shield muck is different from the flow state of the slurry balance shield muck, and is mainly in a plastic and soft plastic state, and is usually in a paste shape, so that dehydration and screening are extremely difficult, the recycling difficulty is increased, and the added value is reduced. From the aspect of enterprises, the construction cost is greatly increased, the field operation environment and safety are affected, and the construction period is delayed. From the social aspect, safety accidents such as landslide and the like are extremely easy to occur when the shield slag is stacked in open air due to higher water content and mud content of the shield slag, and the surrounding water and soil environment is polluted.
Therefore, how to dispose shield slag, particularly earth pressure balance shield slag, is an unavoidable problem for subway construction. The existing shield residue soil treatment technology mainly comprises the steps of preparing baking-free bricks, pavement bricks, fillers and the like, and relates to less shield residue soil mortar. And how to prepare the on-site shield slag soil slag discharge into ready-mixed mortar, and the ready-mixed mortar is instantly allocated at a construction site, so that the problem of time connection between the shield slag soil slag discharge and on-site use is solved, the on-site construction is convenient, the operability is good, and the method is a heavy difficulty in preparing the ready-mixed mortar by the shield slag soil.
If the original shield slag soil is combined with industrial waste residues and the like to directly prepare ready mixed mortar, the shield slag soil is treated and utilized on a large scale, meanwhile, the production cost is reduced, the added value of slag soil products is improved, the aim of changing waste into valuable is achieved by treating waste with waste, and remarkable economic benefit, environmental benefit and social benefit are obtained. However, the existing curing treatment method, particularly alkali-activated cementing material curing, has the problem of faster setting time, and shield slag soil is difficult to treat in a short time. Therefore, how to consume a large amount of shield slag soil in the shield construction site in different time periods and different places is an important difficult problem facing the recycling treatment of the shield slag soil.
Disclosure of Invention
Based on the technical problems in the prior art, the invention provides premixed mortar based on undisturbed shield slag, and aims to solve the problem that the existing shield slag baking-free building material product has limited amount of consumed shield slag and cannot dispose a large amount of shield slag on a shield construction site at different places in different time periods.
In order to achieve the above purpose, the ready-mixed mortar based on the undisturbed shield slag soil provided by the invention can be prepared in real time, solves the problem of time connection between slag discharging of the shield slag soil and on-site use, is convenient for on-site construction and good in operability, has higher compressive strength, excellent impermeability and water retention performance, small apparent density and low preparation cost, and realizes 'changing waste into valuables'.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the premixed mortar based on the undisturbed shield slag soil is characterized by comprising the following raw materials in percentage by mass: 60% -85% of undisturbed shield slag, 10% -40% of alkali-activated cementing material, 0.5% -3% of acrylate gel material, 1% -10% of cement and 3% -15% of water;
wherein, the alkali-activated cementing material consists of the following raw materials in percentage by mass: 60% -95% of a gel component and 5% -40% of an alkali activator; the acrylate gel material comprises the following raw materials in percentage by mass: 0-50% of acrylic acid salt and 100-50% of polyaluminum chloride.
Preferably, the undisturbed shield residue soil is the undisturbed residue soil which is not dehydrated and screened in the ground residue soil pool and is transported or pumped to the ground residue soil pool by a screw conveyor, a belt conveyor and a track residue soil truck after the front soil body is cut by a cutter head of the shield machine.
Preferably, the undisturbed muck is one or more of earth pressure balance shield muck or slurry balance shield muck.
Preferably, the gelling component is one or more of blast furnace slag, fly ash, silica fume, natural pozzolan, steel slag.
Further, the fineness of the gel component is 200 mesh or more.
Preferably, the alkali-activator is one or more of quicklime, sodium carbonate, sodium silicate, sodium metaaluminate and sodium hydroxide.
Preferably, the calcium content of the quicklime is more than 75%, and the fineness is more than 100 meshes.
Preferably, the sodium carbonate is in a powder form, and the fineness is more than 100 meshes.
Preferably, the sodium silicate is in a powder form, the modulus is 2.0-3.2, and the fineness is more than 100 meshes.
Preferably, the sodium metaaluminate is in a powder shape, and the fineness is more than 100 meshes.
Preferably, the sodium hydroxide is in solid flake analytical purity, greater than 99%.
Preferably, the acrylic acid salt is one or more of magnesium acrylate, sodium acrylate and calcium acrylate.
Preferably, the polyaluminum chloride (PAC) is in the form of a solid powder.
Preferably, the cement is Portland cement.
The invention also provides a preparation method of the ready-mixed mortar based on undisturbed shield slag soil, which comprises the following steps:
(1) Respectively weighing raw materials according to mass percent, adding water into undisturbed shield slag soil, and uniformly mixing and stirring to obtain a material S1;
(2) The gel component, the alkali excitant, the acrylate and the polyaluminium chloride are mixed and stirred uniformly to obtain a material S2;
(3) Adding the material S2 into the material S1, and uniformly mixing and stirring to obtain shield slag soil premixed mortar I;
(4) Adding cement into the shield slag soil premixed mortar I, and uniformly mixing and stirring to obtain shield slag soil-based premixed mortar;
alternatively, the method comprises the following steps:
(1) Respectively weighing raw materials according to mass percent, adding water into the undisturbed shield slag soil, and uniformly mixing and stirring to obtain a material S1;
(2) Mixing cement, a gelatinizing component, an alkali excitant, acrylate and polyaluminium chloride uniformly to obtain a material S2;
(3) And adding the material S2 into the material S1, and uniformly mixing and stirring to obtain the premixed mortar based on the shield slag soil.
When the shield residue soil mortar is used on site, the premixed mortar and cement can be directly mixed and stirred uniformly in proportion and then applied to the site for maintenance, and the shield residue soil mortar finished product meeting the strength requirement is obtained.
The ready-mixed mortar based on the undisturbed shield residue soil can be used as masonry mortar, plastering mortar, ground mortar, waterproof mortar and other ready-mixed materials.
Compared with the prior art, the invention has the following beneficial effects:
the pre-mixed mortar is prepared by combining and synergistic effect of the shield slag soil, the alkali-activated cementing material, the acrylate gel material and the cement, and a mortar product with higher compressive strength, excellent impermeability and water retention performance and small apparent density can be obtained. According to the invention, the acrylate gel material is introduced, the acrylate and the polyaluminium chloride are mixed together in a staggered and complicated way, and hydrolysis or other decomposition reactions do not occur, wherein the polyaluminium chloride is an inorganic high molecular polymer and is easy to dissolve in water, has the performances of adsorption, condensation, precipitation and the like, and the polyaluminium chloride is polymerized with the acrylate after being dissolved in water to form a net-shaped composite polymer gel phase substance, and the gel phase substance generated by adding a proper amount of the acrylate gel material can effectively prevent alkali from exciting the reaction of the gel material so as to avoid the strength development; the cement is added, so that the raw materials can undergo severe hydration reaction, the moisture content in the shield slag soil premixed material is reduced, the existing acrylate gel phase material structure is destroyed along with the migration of moisture and the shrinkage of the premixed slag soil material, the alkali-activated gel material plays a role again, namely, the gel component reacts with the alkali-activated agent to generate a gel material and then wraps the slag soil body, and the solidification strength is gradually improved.
The preparation method of the undisturbed shield residue soil ready-mixed mortar or material provided by the invention solves the operability problem of preparing the ready-mixed mortar or material by using the strength rule characteristics of the process method.
Besides, the method has low preparation cost, can directly prepare a large amount of shield slag soil on a shield construction site into mortar, realizes changing waste into valuable, and provides a new thought for recycling the shield slag soil.
Drawings
FIG. 1 is a graph showing the change of compressive strength with curing time for five schemes in an embodiment of the invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
The invention aims to provide ready-mixed mortar based on undisturbed shield slag soil, which comprises the following raw materials in percentage by mass: 60% -85% of undisturbed shield slag, 10% -40% of alkali-activated cementing material, 0.5% -3% of acrylate gel material, 1% -10% of cement and 3% -15% of water;
wherein, the alkali-activated cementing material consists of the following raw materials in percentage by mass: 60% -95% of a gel component and 5% -40% of an alkali activator; the acrylate gel material comprises the following raw materials in percentage by mass: 0-50% of acrylic acid salt and 100-50% of polyaluminum chloride.
The cement is Portland cement.
The gelling component is one or more of blast furnace slag, fly ash, silica fume, natural volcanic ash and steel slag; preferably, the fineness of the gel component is 200 mesh or more.
The alkali-activated agent is one or more of quicklime, sodium carbonate, sodium silicate, sodium metaaluminate and sodium hydroxide.
The acrylic acid salt is one or more of magnesium acrylate, sodium acrylate and calcium acrylate.
The polyaluminum chloride (PAC) is in solid powder form.
The premixed mortar based on the undisturbed shield slag soil, provided by the specific embodiment, also comprises the research on a preparation method of the premixed mortar of the shield slag soil, and is specifically as follows:
five technological proportioning schemes are designed, curing strength differences of different raw material compositions and preparation methods thereof are examined, and the specific raw material compositions are as follows:
scheme one: 68.5% of undisturbed shield slag, 6.5% of water, 20.9% of blast furnace slag, 1.7% of quicklime, 1.5% of sodium carbonate and 0.9% of sodium silicate.
Scheme II: 68.5% of undisturbed shield slag, 6.5% of water, 20.9% of blast furnace slag, 1.7% of quicklime, 1.5% of sodium carbonate and 0.9% of sodium silicate; 0.25 percent of magnesium acrylate and 0.81 percent of polyaluminum chloride are added.
Scheme III: 68.5% of undisturbed shield slag, 6.5% of water, 20.9% of blast furnace slag, 1.7% of quicklime, 1.5% of sodium carbonate and 0.9% of sodium silicate; 0.25 percent of magnesium acrylate and 0.81 percent of polyaluminium chloride are added; 3.25% of additional cement.
Scheme IV: 68.5% of undisturbed shield slag, 6.5% of water, 20.9% of blast furnace slag, 1.7% of quicklime, 1.5% of sodium carbonate and 0.9% of sodium silicate; 0.16 percent of magnesium acrylate and 0.32 percent of polyaluminum chloride are added.
Scheme five: 68.5% of undisturbed shield slag, 6.5% of water, 20.9% of blast furnace slag, 1.7% of quicklime, 1.5% of sodium carbonate and 0.9% of sodium silicate; 0.16 percent of magnesium acrylate and 0.32 percent of polyaluminium chloride are added; 3.25% of additional cement.
Wherein, the additional raw materials in the second scheme, the third scheme, the fourth scheme and the fifth scheme are percentages of the total mass of the raw materials in the first scheme.
In the five schemes, the undisturbed shield slag is taken from the fully weathered slate shield slag in a certain section of a long-sand subway No. 6 line, and the initial water content is 41%. In the test process, firstly adding water into undisturbed shield slag soil, mixing and stirring uniformly, then adding blast furnace slag, quicklime, sodium carbonate, sodium silicate, and additionally adding magnesium acrylate, polyaluminium chloride and cement, mixing uniformly, and finally pouring the mixed material into a 70.7-70.7 mm cube mould. Curing and demolding under natural conditions at room temperature, and then testing the compressive strength of the test pieces 1d, 3d, 7d, 14d, 21d and 28d respectively. The compressive strength values for the five schemes tested are shown in table 1 and figure 1.
Table 1 five protocol compressive strength values
Fig. 1 is a graph showing the change of the compressive strength of the five schemes according to the curing time, and the compressive strength values in combination with table 1 show that the development of the compressive strength of the cured test piece, which is the alkali-activated reaction, is effectively hindered by adding magnesium acrylate and polyaluminium chloride, and the compressive strength is reduced more greatly as the mixing amount of the acrylate gel material is increased. At the same time, by further adding Portland cement, the curing strength can be recovered. For example, as can be seen from a comparison of the compressive strength of the third and fifth solutions with the first solution, the compressive strengths of the third and fifth solutions are lower than the first solution before the curing time 7d, and the compressive strengths of the third and fifth solutions have exceeded the first solution after the curing time 7 d.
Of the above five schemes, the curing strength of the five schemes gradually increases with the increase of curing time. After addition of magnesium acrylate and polyaluminium chloride, there was substantially no increase in strength, e.g., 7d for scheme two and scheme four and previously substantially zero. And silicate cement is additionally added on the basis of the scheme II and the scheme IV, so that hydration reaction can be promoted to be carried out again, and the strength is gradually increased, for example, the 28d strength of the scheme III and the scheme V exceeds the 28d strength of the scheme I.
Therefore, the method can fully utilize the rule to prepare the ready mixed mortar based on the shield slag soil. The slag materials for in-situ tunneling are firstly mixed with water, blast furnace slag, quicklime, sodium carbonate, sodium silicate, magnesium acrylate, polyaluminium chloride and the like and stirred uniformly for standby, and finally cement is added for use.
According to the premixed mortar based on undisturbed shield slag soil, which is provided by the specific embodiment, the preparation method comprises the following steps:
(1) Respectively weighing raw materials according to mass percent, adding water into undisturbed shield slag soil, and uniformly mixing and stirring to obtain a material S1;
(2) The gel component, the alkali excitant, the acrylate and the polyaluminium chloride are mixed and stirred uniformly to obtain a material S2;
(3) Adding the material S2 into the material S1, and uniformly mixing and stirring to obtain shield slag soil premixed mortar I;
(4) Adding silicate cement into the shield slag soil premixed mortar I, and uniformly mixing and stirring to obtain shield slag soil-based premixed mortar;
(5) And applying the premixed mortar based on the shield slag soil to the site and curing to obtain a final shield slag soil mortar finished product.
The concrete implementation mode also comprises premixed mortar based on undisturbed shield slag soil, which is prepared by adopting the preparation method.
The following is a detailed description of related embodiments. The undisturbed shield slag pre-mixed mortar in the following embodiments can be used as masonry mortar, plastering mortar, ground mortar, waterproof mortar, or other pre-mixed materials.
Example 1
A ready-mixed mortar based on undisturbed shield slag soil consists of the following raw materials in percentage by mass: 62.75% of undisturbed shield slag, 7.84% of water, 15.41% of blast furnace slag, 3.41% of fly ash, 1.73% of quicklime, 1.57% of sodium carbonate, 1.41% of sodium silicate, 0.39% of magnesium acrylate, 1.57% of polyaluminium chloride and 3.92% of cement. Wherein, the undisturbed shield residue soil is taken from the powdery clay shield residue soil of the Tianjin subway No. 7 line.
The preparation method comprises the following steps:
(1) Respectively weighing raw materials according to mass percent, adding water into undisturbed shield slag soil, and uniformly mixing and stirring to obtain a material S1;
(2) Mixing and uniformly stirring blast furnace slag, fly ash, quicklime, sodium carbonate, sodium silicate, magnesium acrylate and polyaluminium chloride to obtain a material S2;
(3) Adding the material S2 into the material S1, and uniformly mixing and stirring to obtain shield slag soil premixed mortar I;
(4) And adding the silicate cement into the shield slag soil premixed mortar I, and uniformly mixing and stirring to obtain the shield slag soil-based premixed mortar.
And applying the premixed mortar based on the shield slag soil to the site and curing to obtain a final shield slag soil mortar finished product.
Through tests, the premixed mortar based on the shield slag soil, which is prepared in the embodiment 1, has the average compressive strength of 7d of 3.39MPa and the average compressive strength of 28d of 16.24MPa. The consistency of the shield slag soil ready-mixed mortar is measured to be 52mm according to JGJ70-2009 building mortar basic performance test method; the water retention rate is 98.6%.
Comparative example 1
A ready-mixed mortar based on undisturbed shield slag soil was used as a comparative example to example 1. The material consists of the following raw materials: the amounts of the raw shield slag, water, blast furnace slag, fly ash, quicklime, sodium carbonate, sodium silicate, magnesium acrylate and polyaluminium chloride were the same as in example 1. Wherein, the undisturbed shield residue soil is taken from the powdery clay shield residue soil of the Tianjin subway No. 7 line.
The preparation method comprises the following steps:
(1) Respectively weighing raw materials according to mass percent, adding water into undisturbed shield slag soil, and uniformly mixing and stirring to obtain a material S1;
(2) Mixing and uniformly stirring blast furnace slag, fly ash, quicklime, sodium carbonate, sodium silicate, magnesium acrylate and polyaluminium chloride to obtain a material S2;
(3) And adding the material S2 into the material S1, and uniformly mixing and stirring to obtain the final premixed mortar based on the shield slag soil.
Through tests, the premixed mortar based on the shield slag soil, which is prepared in the comparative example 1, has the average compressive strength of 7d of 0MPa and the average compressive strength of 28d of 0.35MPa.
Example 2
A ready-mixed mortar based on undisturbed shield slag soil consists of the following raw materials in percentage by mass: 64.72% of undisturbed shield slag soil, 6.47% of water, 15.02% of blast furnace slag, 2.13% of fly ash, 2.27% of silica fume, 1.38% of quicklime, 1.46% of sodium carbonate, 1.46% of sodium silicate, 0.35% of magnesium acrylate, 0.05% of sodium acrylate, 1.45% of polyaluminium chloride and 3.24% of cement. The undisturbed shield muck is taken from the medium-wind-driven slate shield muck of a No. 6 line of a long-sand subway.
The preparation method comprises the following steps:
(1) Respectively weighing raw materials according to mass percent, adding water into undisturbed shield slag soil, and uniformly mixing and stirring to obtain a material S1;
(2) Mixing and stirring blast furnace slag, fly ash, silica fume, quicklime, sodium carbonate, sodium silicate, magnesium acrylate, sodium acrylate and polyaluminium chloride uniformly to obtain a material S2;
(3) Adding the material S2 into the material S1, and uniformly mixing and stirring to obtain shield slag soil premixed mortar I;
(4) And adding the silicate cement into the shield slag soil premixed mortar I, and uniformly mixing and stirring to obtain the shield slag soil-based premixed mortar.
And applying the premixed mortar based on the shield slag soil to the site and curing to obtain a final shield slag soil mortar finished product.
Through tests, the average compressive strength of the premixed mortar based on the shield slag soil, which is prepared in the embodiment 2, is 0.20MPa for 7d, and 10.52MPa for 28 d. The consistency of the shield slag soil ready-mixed mortar is measured to be 55mm according to JGJ70-2009 building mortar basic performance test method; the water retention rate is 98.8%.
Comparative example 2
A ready-mixed mortar based on undisturbed shield slag soil was used as a comparative example to example 2. The material consists of the following raw materials: the amounts of the raw shield slag, water, blast furnace slag, fly ash, silica fume, quicklime, sodium carbonate, sodium silicate, magnesium acrylate, sodium acrylate and polyaluminium chloride were the same as in example 2. The undisturbed shield muck is taken from the medium-wind-driven slate shield muck of a No. 6 line of a long-sand subway.
The preparation method comprises the following steps:
(1) Respectively weighing raw materials according to mass percent, adding water into undisturbed shield slag soil, and uniformly mixing and stirring to obtain a material S1;
(2) Mixing and stirring blast furnace slag, fly ash, silica fume, quicklime, sodium carbonate, sodium silicate, magnesium acrylate, sodium acrylate and polyaluminium chloride uniformly to obtain a material S2;
(3) And adding the material S2 into the material S1, and uniformly mixing and stirring to obtain the final premixed mortar based on the shield slag soil.
Through tests, the premixed mortar based on the shield slag soil, which is prepared in the comparative example 2, has the average compressive strength of 7d of 0MPa and the average compressive strength of 28d of 0.45MPa.
Example 3
A ready-mixed mortar based on undisturbed shield slag soil consists of the following raw materials in percentage by mass: 65.25% of undisturbed shield slag, 6.07% of water, 15.33% of blast furnace slag, 4.40% of steel slag, 1.44% of quicklime, 1.52% of sodium carbonate, 0.98% of sodium silicate, 0.46% of sodium metaaluminate, 0.38% of magnesium acrylate, 0.38% of polyaluminium chloride and 3.79% of cement. The undisturbed shield slag is taken from the fully weathered slate shield slag of the North line of the No. 1 long-sand subway.
The preparation method comprises the following steps:
(1) Respectively weighing raw materials according to mass percent, adding water into undisturbed shield slag soil, and uniformly mixing and stirring to obtain a material S1;
(2) Mixing and uniformly stirring blast furnace slag, steel slag, quick lime, sodium carbonate, sodium silicate, sodium metaaluminate, magnesium acrylate and polyaluminium chloride to obtain a material S2;
(3) Adding the material S2 into the material S1, and uniformly mixing and stirring to obtain shield slag soil premixed mortar I;
(4) And adding the silicate cement into the shield slag soil premixed mortar I, and uniformly mixing and stirring to obtain the shield slag soil-based premixed mortar.
And applying the premixed mortar based on the shield slag soil to the site and curing to obtain a final shield slag soil mortar finished product.
Through tests, the premixed mortar based on the shield slag soil prepared in the embodiment 3 has an average compressive strength of 7d of 2.06MPa and an average compressive strength of 28d of 9.82MPa. The consistency of the shield slag soil ready-mixed mortar is measured to be 53mm according to JGJ70-2009 building mortar basic performance test method; the water retention rate is 99.2%.
Comparative example 3
A ready-mixed mortar based on undisturbed shield slag as a comparative example to example 3. The material consists of the following raw materials: the amounts of the raw shield slag, water, blast furnace slag, steel slag, quicklime, sodium carbonate, sodium silicate, sodium metaaluminate, magnesium acrylate and polyaluminium chloride were the same as in example 3. The undisturbed shield slag is taken from the fully weathered slate shield slag of the North line of the No. 1 long-sand subway.
The preparation method comprises the following steps:
(1) Respectively weighing raw materials according to mass percent, adding water into undisturbed shield slag soil, and uniformly mixing and stirring to obtain a material S1;
(2) Mixing and uniformly stirring blast furnace slag, steel slag, quick lime, sodium carbonate, sodium silicate, sodium metaaluminate, magnesium acrylate and polyaluminium chloride to obtain a material S2;
(3) And adding the material S2 into the material S1, and uniformly mixing and stirring to obtain the final premixed mortar based on the shield slag soil.
Through tests, the premixed mortar based on the shield slag soil, which is prepared in the comparative example 3, has the average compressive strength of 7d of 0MPa and the average compressive strength of 28d of 0.40MPa.
In addition, the invention has the following other beneficial effects:
(1) The shield slag soil premixed mortar does not need dehydration or screening treatment, is free of sintering, and is simple in treatment process, low in treatment cost, low in carbon and environment-friendly.
(2) The method has universal applicability to different types of shield slag soil, can be popularized and copied, and greatly improves the additional value of the shield slag soil.
(3) The method can realize large-scale treatment and resource utilization of the shield slag, save the transportation cost and the disposal cost of the shield slag, reduce the construction cost, avoid the safety risk and hidden danger caused by the piling of the slag, and obtain good economic benefit, environmental benefit and social benefit.
The raw shield slag used in the above embodiment is a shield slag which is difficult to treat, the content of the clay particles is high, the content of the coarse particles is low, the performance of the prepared shield slag ready-mixed mortar is not optimal, and if the compressive strength and the like of the ready-mixed mortar prepared by the shield slag with higher sand and stone content or lower water content are superior to those of the invention, the compressive strength and the like of the ready-mixed mortar prepared by the shield slag with higher sand and stone content are all within the scope of the invention.
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 herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
Claims (9)
1. The premixed mortar based on the undisturbed shield slag soil is characterized by comprising the following raw materials in percentage by mass: 60% -85% of undisturbed shield slag, 10% -40% of alkali-activated cementing material, 0.5% -3% of acrylate gel material, 1% -10% of cement and 3% -15% of water;
wherein, the alkali-activated cementing material consists of the following raw materials in percentage by mass: 60% -95% of a gel component and 5% -40% of an alkali activator; the acrylate gel material comprises the following raw materials in percentage by mass: 0-50% of acrylic acid salt and 100-50% of polyaluminum chloride.
2. The ready-mixed mortar based on undisturbed shield slag, according to claim 1, characterized in that the fineness of the gelling component is above 200 mesh.
3. The ready-mixed mortar based on undisturbed shield slag soil according to claim 1, wherein the gelling component is one or more of blast furnace slag, fly ash, silica fume, natural pozzolan, steel slag.
4. The ready-mixed mortar based on undisturbed shield slag as claimed in claim 1, wherein the alkali-activator is one or more of quicklime, sodium carbonate, sodium silicate, sodium metaaluminate, sodium hydroxide.
5. The ready-mixed mortar based on undisturbed shield slag as claimed in claim 1, wherein the acrylic acid salt is one or more of magnesium acrylate, sodium acrylate and calcium acrylate.
6. The ready-mixed mortar based on undisturbed shield slag as claimed in claim 1, wherein the polyaluminium chloride is in solid powder form.
7. The ready-mixed mortar based on undisturbed shield slag as claimed in claim 1, wherein the cement is portland cement.
8. The method for preparing ready-mixed mortar based on undisturbed shield slag as claimed in any one of claims 1-7, comprising the steps of:
(1) Respectively weighing raw materials according to mass percent, adding water into the undisturbed shield slag soil, and uniformly mixing and stirring to obtain a material S1;
(2) The gel component, the alkali excitant, the acrylate and the polyaluminium chloride are mixed and stirred uniformly to obtain a material S2;
(3) Adding the material S2 into the material S1, and uniformly mixing and stirring to obtain shield slag soil premixed mortar I;
(4) Adding cement into the shield slag soil premixed mortar I, and uniformly mixing and stirring to obtain shield slag soil-based premixed mortar;
alternatively, the method comprises the following steps:
(1) Respectively weighing raw materials according to mass percent, adding water into the undisturbed shield slag soil, and uniformly mixing and stirring to obtain a material S1;
(2) Mixing cement, a gelatinizing component, an alkali excitant, acrylate and polyaluminium chloride uniformly to obtain a material S2;
(3) And adding the material S2 into the material S1, and uniformly mixing and stirring to obtain the premixed mortar based on the shield slag soil.
9. Use of a ready-mixed mortar based on undisturbed shield slag as defined in any one of claims 1 to 7, characterized in that the ready-mixed mortar is used as at least one of masonry mortar, plastering mortar, ground mortar, waterproof mortar.
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