CN117510111A - Curing agent for in-situ curing of high-water-content silt soft soil - Google Patents
Curing agent for in-situ curing of high-water-content silt soft soil Download PDFInfo
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- CN117510111A CN117510111A CN202311496423.2A CN202311496423A CN117510111A CN 117510111 A CN117510111 A CN 117510111A CN 202311496423 A CN202311496423 A CN 202311496423A CN 117510111 A CN117510111 A CN 117510111A
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 63
- 239000002689 soil Substances 0.000 title claims abstract description 46
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 35
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 75
- 239000000463 material Substances 0.000 claims abstract description 68
- 239000004568 cement Substances 0.000 claims abstract description 57
- 239000003513 alkali Substances 0.000 claims abstract description 44
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000004094 surface-active agent Substances 0.000 claims abstract description 21
- 239000010802 sludge Substances 0.000 claims description 43
- 239000002893 slag Substances 0.000 claims description 24
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 21
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 19
- 239000002245 particle Substances 0.000 claims description 19
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 14
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 10
- IQYKECCCHDLEPX-UHFFFAOYSA-N chloro hypochlorite;magnesium Chemical compound [Mg].ClOCl IQYKECCCHDLEPX-UHFFFAOYSA-N 0.000 claims description 9
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 9
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 9
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
- OLZDXDPSDUSGIS-UHFFFAOYSA-N sulfinylmagnesium Chemical compound [Mg].S=O OLZDXDPSDUSGIS-UHFFFAOYSA-N 0.000 claims description 6
- 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 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 3
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000013329 compounding Methods 0.000 abstract description 3
- 238000001723 curing Methods 0.000 description 110
- 239000011248 coating agent Substances 0.000 description 26
- 238000000576 coating method Methods 0.000 description 26
- 238000012360 testing method Methods 0.000 description 20
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 10
- 239000011777 magnesium Substances 0.000 description 10
- 229910052749 magnesium Inorganic materials 0.000 description 10
- 239000002131 composite material Substances 0.000 description 8
- 238000007711 solidification Methods 0.000 description 7
- 230000008023 solidification Effects 0.000 description 7
- 239000007888 film coating Substances 0.000 description 6
- 238000009501 film coating Methods 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- FYYHWMGAXLPEAU-OUBTZVSYSA-N magnesium-25 atom Chemical compound [25Mg] FYYHWMGAXLPEAU-OUBTZVSYSA-N 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003415 peat Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- CENHPXAQKISCGD-UHFFFAOYSA-N trioxathietane 4,4-dioxide Chemical compound O=S1(=O)OOO1 CENHPXAQKISCGD-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- PXQPYSJHFKRUAJ-UHFFFAOYSA-M [Cl-].[Mg+2].[O-2].[Mg+2] Chemical compound [Cl-].[Mg+2].[O-2].[Mg+2] PXQPYSJHFKRUAJ-UHFFFAOYSA-M 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000404 calcium aluminium silicate Substances 0.000 description 1
- 235000012215 calcium aluminium silicate Nutrition 0.000 description 1
- WNCYAPRTYDMSFP-UHFFFAOYSA-N calcium aluminosilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O WNCYAPRTYDMSFP-UHFFFAOYSA-N 0.000 description 1
- 229940078583 calcium aluminosilicate Drugs 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- -1 magnesium oxysulfide hexahydrate Chemical compound 0.000 description 1
- QENHCSSJTJWZAL-UHFFFAOYSA-N magnesium sulfide Chemical compound [Mg+2].[S-2] QENHCSSJTJWZAL-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- FWFGVMYFCODZRD-UHFFFAOYSA-N oxidanium;hydrogen sulfate Chemical compound O.OS(O)(=O)=O FWFGVMYFCODZRD-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000003313 weakening 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
- C04B9/00—Magnesium cements or similar cements
- C04B9/11—Mixtures thereof with other inorganic cementitious materials
- C04B9/12—Mixtures thereof with other inorganic cementitious materials with hydraulic cements, e.g. Portland cements
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention relates to a curing agent for in-situ curing of high-water-content silt soft soil, which consists of 30-70% of sulphoaluminate cement, 20-60% of alkali-activated cementing material, 3-12% of magnesia cementing material and 0-0.1% of surfactant by mass percent; the invention solves the problem of early strength development of cured silt under the condition of film covering maintenance by compounding the components, and further solves the problem that the existing curing agent cannot meet the on-site curing bearing capacity because of the huge difference between the indoor curing strength and the on-site curing effect. The curing agent has the advantages of high curing strength, short time, low cost and stable performance, considers the curing strength under the condition of film covering maintenance for the silt soft soil with the water content of more than 60 percent, is suitable for the in-situ curing requirement on site, and can effectively improve the bearing capacity of the soft soil foundation.
Description
Technical Field
The invention belongs to the technical field of civil construction materials, and particularly relates to a curing agent for in-situ curing of sludge soft soil with high water content, which can meet the requirement of in-situ curing treatment.
Background
In recent years, the development of the infrastructure construction in China is rapid, soft soil foundations such as silt, mucky soil, peat and peat soil are often faced, and because soft soil has the special engineering properties such as high natural water content, low strength, large pore ratio, high compression coefficient, thixotropy, creep property and the like, is often in a flowing plastic state or a soft plastic state, has poor engineering geological conditions, and can usually generate safety accidents such as ground subsidence cracking, foundation pit collapse or capsizing and the like without reinforcement treatment, thereby bringing great challenges to project construction and engineering quality. Therefore, reinforcement treatment must be performed according to the engineering characteristics of soft soil.
Among a plurality of soft foundation disposal methods, the solidification and stabilization technology is not an effective method, and particularly, the in-situ solidification and disposal of the sludge has the advantages of saving the transportation and disposal cost without outward transportation of the sludge, saving the construction cost without changing the stone slag, reducing or completely replacing the changing and filling soil and the like. The chemical curing has the advantages of wide sources of raw materials, low curing cost, quick curing time and the like, can achieve the effects of quick hardening and saving the construction cost, and creates favorable conditions for project construction.
Because soft soil has the characteristic of high water content, the indoor curing strength is not matched with the on-site curing test result, and engineering practice is difficult to guide. On one hand, many researches are carried out on the curing test (a part of the curing test is also carried out by adopting a static pressure molding method) of removing impurities in the sludge after the sludge is aired, crushed and sieved, so that the influence of the initial water content on the curing strength of the sludge is neglected, and the test result is distorted; on the other hand, although the curing test was performed as it is with sludge, most of the tests use a standard curing or non-film curing method, and in practice, the external environmental conditions on site are also changed. For the sludge with high water content, after the curing agent is doped, the internal water can be accelerated to be lost, so that the curing strength is improved, the effectiveness of the curing agent can not be well judged at the moment, and the curing result is distorted.
Disclosure of Invention
Aiming at the problems that the prior curing agent ignores the problem that the original moisture content of the sludge or the internal moisture loss after curing causes the distortion of the curing result, so that the curing agent cannot be applied to guiding the in-situ curing on site. The invention aims to provide a curing agent for in-situ curing of high-moisture-content silt soft soil, comprehensively considers the curing effect under the high-moisture-content silt film coating curing condition, solves the problem of early strength development of cured silt soil under the film coating curing condition by compounding all components, further solves the problem that the existing curing agent cannot meet the field curing bearing capacity due to the huge difference between the indoor curing strength and the field curing effect, can effectively improve the bearing capacity of a soft soil foundation, and solves the problem that the actual engineering application cannot be guided due to the mismatching of the indoor curing strength and the field curing test result, thereby meeting the field in-situ curing requirement.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the curing agent for in-situ curing of the high-water-content silt soft soil comprises sulphoaluminate cement, alkali-activated cementing material, magnesia cementing material and surfactant; the curing agent consists of 30-70% of sulphoaluminate cement, 20-60% of alkali-activated cementing material, 3-12% of magnesia cementing material and 0-0.1% of surfactant according to mass percentage;
wherein, the alkali-activated cementing material consists of 65-90% of cementing components and 10-30% of alkali-activated agents according to mass percent;
the magnesia cementing material consists of 60-75% of magnesium oxide and 10-30% of magnesium chloride or magnesium sulfate according to mass percent;
the content of the surfactant is more than 0;
the water content of the high-water-content silt soft soil is 60% -80%.
In the technical scheme, the magnesia cementing material consists of 60-75% of magnesium oxide and 10-30% of magnesium chloride by mass percent; or consists of 60% -75% magnesium oxide and 10% -30% magnesium sulfate.
Preferably, the sulphoaluminate cement is one or more of quick hardening sulphoaluminate cement and low alkalinity sulphoaluminate cement.
Preferably, the gelling component in the alkali-activated gelling material is one or more of blast furnace slag and high titanium slag.
Preferably, the alkali-activated agent in the alkali-activated gelling material is one or more of sodium carbonate, sodium sulfate and sodium metaaluminate.
The magnesia cementing material is magnesium oxychloride cement or magnesium oxysulfide cement; preferably, the magnesia is light burned magnesia, and the content is more than 75%.
Preferably, the magnesium chloride is anhydrous magnesium chloride and the magnesium sulfate is anhydrous magnesium sulfate.
Preferably, the surfactant is one or more of sodium dodecyl sulfate and sodium dodecyl benzene sulfonate.
The curing agent is prepared by uniformly mixing sulphoaluminate cement, alkali-activated cementing material, magnesium cementing material and surfactant according to the corresponding mass ratio, and grinding the mixture to more than 200 meshes, wherein the particle ratio of particles with the particle size of less than 10 mu m is more than 30%.
The curing agent meets the curing strength of the sludge soft soil with high water content under the natural curing condition of the coating, and is suitable for in-situ curing treatment of engineering sites.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the four components of the sulphoaluminate cement, the alkali-activated cementing material, the magnesium cementing material and the surfactant are compounded in a synergistic way, so that the problem of early strength development of cured silt soil under the condition of film covering maintenance is solved, the problem that the existing curing agent cannot meet the on-site curing bearing capacity due to the great difference between the indoor curing strength and the on-site curing effect is further solved, and the composite bearing capacity of a soft soil foundation can be effectively improved.
Specifically, a proper amount of sulphoaluminate cement is added, the characteristics of quick setting and hardening and high early strength are fully utilized, and under the condition of high water content of film covering maintenance, the sulphoaluminate cement is quickly absorbed and subjected to hydration reaction, so that the initial water content of the sludge is reduced. The alkali-activated gelling material has excellent water-resistant property, and generates hydrated calcium silicate, hydrated calcium aluminate and hydrated calcium aluminosilicate gel phase materials through the interaction of the gelling component and the alkali-activated agent, so that a sludge solidified body is filled and compacted, and the solidification strength is improved. Meanwhile, magnesium oxide and magnesium chloride or magnesium sulfate can be quickly hardened at normal temperature and normal pressure to generate magnesium oxide-magnesium chloride/magnesium sulfate-water ternary compound crystal phase, and trace air can be introduced while weakening the surface tension of materials in the stirring process by compounding trace anionic surfactant, so that the air hardening characteristic of the magnesia cementing material is enhanced, and the curing effect is further improved. Further, the ground magnesium oxide has larger specific surface area, and the opportunity of contacting with magnesium chloride or magnesium sulfate aqueous solution is more, the reaction is better, and the generated crystal phase is more.
According to the invention, the curing strength of the high-water-content sludge film-coating curing condition is effectively improved through the composite use of the sulfoaluminate cement, the alkali-activated cementing material, the magnesium cementing material and the surfactant. The hydration products of the sulphoaluminate cement are mainly ettringite, if the mixing amount is too high, the products generated in a short time are more, the micro-expansibility side effect is obvious, the brittleness is higher, the cracking of solidified soil is easy to cause, and the later-stage strong collapse occurs. Under the condition of singly adopting alkali-activated cementing materials, as the water content of the sludge is higher, the alkali solubility is reduced, the early strength of the solidified sludge soil is not high, the water content of the sludge can be reduced by using the sulphoaluminate cement in a combined way, and more cementing materials are produced by the alkali-activated cementing materials. Also, since magnesium oxychloride cement or magnesium oxysulfide cement is air hardening, the curing strength cannot be obtained by adopting the magnesium oxychloride cement or the magnesium oxysulfide cement alone, and part of air can be introduced when the surfactant is mixed, so that the air hardening characteristic of the magnesium oxychloride cement or the magnesium oxysulfide cement is weakened, the formation of a crystalline phase is promoted, the curing strength is improved, and the requirement of in-situ curing on site is met.
The curing agent provided by the invention has the advantages of high curing strength, short time, low cost and stable performance, and can meet the bearing capacity requirement of in-situ curing.
Drawings
FIG. 1 is a graph showing the comparison of 3d compressive strength and 7d compressive strength of the high water content sludge cured by the curing agent of example 1 with the 3d compressive strength without the coating.
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 a curing agent for in-situ curing of high-water-content silt soft soil, which consists of sulphoaluminate cement, alkali-activated cementing material, magnesia cementing material and a surfactant.
Specifically, the curing agent comprises, by mass, 30% -70% of sulphoaluminate cement, 20% -60% of alkali-activated cementing material, 3% -12% of magnesia cementing material and 0-0.1% of surfactant;
wherein, the alkali-activated cementing material consists of 65-90% of cementing components and 10-30% of alkali-activated agents according to mass percent;
the magnesia cementing material consists of 60-75% of magnesium oxide and 10-30% of magnesium chloride or magnesium sulfide by mass percent;
the curing agent is prepared by uniformly mixing sulphoaluminate cement, alkali-activated cementing material, magnesium cementing material and surfactant according to corresponding mass ratio, and grinding the mixture to more than 200 meshes, wherein the particle with the particle size of less than 10 mu m accounts for more than 30 percent;
the water content of the high-water-content silt soft soil is 60% -80%.
First, the curing strength of sludge in the case of coating and non-coating is described by using common portland cement composite blast furnace slag powder. Two silt soil samples with water content of 60% and water content of 80% are respectively selected for curing test, and the curing agent is ordinary Portland cement and blast furnace slag, wherein the blast furnace slag is 200 meshes, and the calcium content is 42%. The mass ratio of cement to slag is 9:1, and the mixing amount of cement to slag in the sludge is 75kg/m respectively 3 、100kg/m 3 、125kg/m 3 . As shown in table 1 below, the 3d compressive strength and 7d compressive strength values of the cement-slag solidified sludge without and with the coating.
TABLE 1 Cement-slag solidified sludge Strength
As can be seen from the results of table 1, the cement-slag solidified sludge has a 3d compressive strength and a 7d compressive strength higher than those of the case of the film without the film; the larger the age, the larger the strength difference; and the higher the water content of the sludge is, the smaller the strength difference is.
With increasing blending amount of the curing agent, the 3d compressive strength and the 7d compressive strength of the cement-slag solidified sludge are gradually increased without coating or film coating. As the blending amount of the curing agent increases, the difference between the compressive strength of the cement-slag solidified sludge 7d in the case of coating and that in the case of non-coating is also greater.
The results show that the difference between the strength results of the cement-slag solidified sludge under the condition of coating and without coating is large, and the solidification strength under the condition of indoor coating can not be used as the reference basis for on-site solidification. Therefore, the curing strength in the case of a film coating needs to be considered to meet the requirement of in-situ curing strength.
Furthermore, the curing strength of the sludge under the condition of film coating and film non-coating is described by using the magnesium oxysulfide cement composite alkali-activated cementing material. And (3) selecting a silt soil sample with the water content of 80% for a curing test, wherein the curing agent consists of magnesia cement and an alkali-activated cementing material, and the mixing amount of the curing agent is 8.5%. The magnesium oxysulfate cement consists of magnesium oxide and magnesium sulfate, wherein the magnesium sulfate is magnesium sulfate hexahydrate and anhydrous magnesium sulfate for comparison, the alkali-activated cementing material consists of blast furnace slag, quicklime, sodium carbonate and sodium silicate, and the mass ratio of the magnesium oxide is as follows: magnesium sulfate: blast furnace slag: quicklime: sodium carbonate: sodium silicate=10:5:12:4:2:1. As shown in table 2 below, the 7d compressive strength and the 14d compressive strength values of the magnesia cement composite alkali-activated cement set sludge without and with the coating are shown.
TABLE 2 strength of the cured sludge of the magnesia cement composite alkali-activated gelling material
The test result shows that the 3d non-strength of the magnesia cement composite alkali-activated cementing material solidified sludge; for magnesium oxysulfide hexahydrate cement, the 7d non-coating strength is 0.230MPa, the coating strength is 0.125MPa, the 14d non-coating strength is 0.625MPa, and the coating strength is 0.320MPa; for anhydrous magnesium oxysulfate cement, the 7d non-coating strength is 0.295MPa, the coating strength is 0.205MPa, the 14d non-coating strength is 0.760MPa, and the coating strength is 0.397MPa. Similar to the cement-slag solidified sludge strength results, the 7d compressive strength and the 14d compressive strength were higher in the case of no coating than in the case of coating; and the larger the age, the larger the intensity gap. The result also shows that the difference of the strength results of the solidified sludge of the magnesia cement composite alkali-activated cementing material under the condition of covering the film and not covering the film is large, and the solidification strength under the condition of not covering the film indoors cannot be used as a site solidification reference basis.
In the following examples and comparative examples, the sludge was obtained from a mud flat formation in a large bay area, and the initial water content was measured to be 70% and the main clay mineral content was 40% or more.
Example 1
A curing agent for in-situ curing of high-water-content silt soft soil comprises sulphoaluminate cement, alkali-activated cementing material, magnesia cementing material and surfactant according to the following mass percent: 40% of quick hardening sulphoaluminate cement, 47.95% of alkali-activated cementing material, 12% of magnesia cementing material and 0.05% of sodium dodecyl sulfate; the alkali-activated cementing material comprises the following raw materials in percentage by mass: blast furnace slag 72.99%, sodium carbonate 8.24%, sodium sulfate 10.43% and sodium metaaluminate 8.34%; the magnesia cementing material comprises the following raw materials in percentage by mass: 75% of magnesium oxide and 25% of anhydrous magnesium chloride.
The sulphoaluminate cement, the alkali-activated cementing material, the magnesium cementing material and the surfactant are uniformly mixed according to the mass proportion and ground to more than 200 meshes, wherein the particle with the particle size smaller than 10 mu m accounts for 50%, and the final curing agent for in-situ curing of the high-water-content silt soft soil is obtained.
The curing agent and the high-water-content sludge with the water content of 70% are mixed and stirred uniformly and then put into a die (the size is 70.7-70.7 mm), and the mixing amount of the curing agent is 7.8%. Through testing, the 3d average compressive strength of the cured test piece is 0.86MPa under the natural curing of the coating at room temperature; 7d the average compressive strength is 1.05MPa; the 3d average compressive strength of the cured test piece is 0.95MPa under natural curing at room temperature without coating; the 7d average compressive strength was 1.12MPa.
FIG. 1 is a graph showing the comparison of 3d compressive strength and 7d compressive strength of a high water content sludge film cured by a curing agent according to example 1 of the present invention with no film. As can be seen from fig. 1, the cured strength in the case of the film of the present invention is substantially equivalent to that in the case of no film under the same conditions. Considering the on-site curing uniformity coefficient of 0.5, the curing strength is still greater than 0.4MPa, and the bearing capacity requirement of on-site in-situ curing can be met.
Example 2
A curing agent for in-situ curing of high-water-content silt soft soil comprises sulphoaluminate cement, alkali-activated cementing material, magnesia cementing material and surfactant according to the following mass percentages: 50% of quick hardening sulphoaluminate cement, 37.92% of alkali-activated cementing material, 12% of magnesia cementing material and 0.08% of sodium dodecyl sulfate; the alkali-activated cementing material comprises the following raw materials in percentage by mass: blast furnace slag 65.93%, high titanium slag 13.19%, sodium carbonate 6.33%, sodium sulfate 7.91% and sodium metaaluminate 6.64%; the magnesia cementing material comprises the following raw materials in percentage by mass: 75% of magnesium oxide and 25% of anhydrous magnesium chloride.
The sulphoaluminate cement, the alkali-activated cementing material, the magnesium cementing material and the surfactant are uniformly mixed according to the mass proportion and ground to more than 200 meshes, wherein the particle ratio of particles with the particle size smaller than 10 mu m is 40%, and the final curing agent for in-situ curing of the high-water-content silt soft soil is obtained.
The curing agent and the high-water-content sludge with the water content of 70% are mixed and stirred uniformly and then put into a mould (the size is 70.7-70.7 mm), the mixing amount of the curing agent is 7.8%, and the laminated film is naturally cured at room temperature. Through testing, the 3d average compressive strength of the cured test piece is 0.81MPa; the average compressive strength of 7d is 0.98MPa.
Example 3
A curing agent for in-situ curing of high-water-content silt soft soil comprises sulphoaluminate cement, alkali-activated cementing material, magnesia cementing material and surfactant according to the following mass percentages: 55% of quick hardening sulphoaluminate cement, 35.90% of alkali-activated cementing material, 9% of magnesia cementing material and 0.1% of sodium dodecyl sulfate; the alkali-activated cementing material comprises the following raw materials in percentage by mass: the blast furnace slag accounts for 59.89%, the high titanium slag accounts for 19.50%, the sodium carbonate accounts for 6.96%, the sodium sulfate accounts for 6.96%, and the sodium metaaluminate accounts for 6.69%; the magnesia cementing material comprises the following raw materials in percentage by mass: 66.67% of magnesium oxide and 33.33% of anhydrous magnesium chloride.
The sulphoaluminate cement, the alkali-activated cementing material, the magnesium cementing material and the surfactant are uniformly mixed according to the mass proportion and ground to more than 200 meshes, wherein the particle ratio of particles with the particle size smaller than 10 mu m is 35%, and the final curing agent for in-situ curing of the high-water-content silt soft soil is obtained.
The curing agent and the high-water-content sludge with the water content of 70% are mixed and stirred uniformly and then put into a mould (the size is 70.7-70.7 mm), the mixing amount of the curing agent is 7.8%, and the laminated film is naturally cured at room temperature. Through testing, the 3d average compressive strength of the cured test piece is 0.77MPa; the 7d average compressive strength was 0.92MPa.
Comparative example 1
A curing agent for in-situ curing of high-water-content silt soft soil adopts PO42.5 cement. The cement is ground to 35 percent of particles with the particle diameter smaller than 10 mu m, and the final high-water-content silt soft soil curing agent is obtained.
The curing agent and the high-water-content sludge with the water content of 70% are mixed and stirred uniformly and then put into a mould (the size is 70.7-70.7 mm), the mixing amount of the curing agent is 7.8%, and the laminated film is naturally cured at room temperature. Through testing, the 3d average compressive strength of the cured test piece is 0.67MPa; the 7d average compressive strength was 0.84MPa.
Comparative example 2
A curing agent for in-situ curing of high-water-content silt soft soil adopts magnesium oxychloride cement. The magnesium oxychloride cement consists of 75% by mass of light burned magnesium oxide and 25% by mass of anhydrous magnesium chloride, and the magnesium oxychloride cement is ground to 50% by mass of particles with the particle size smaller than 10 mu m, so that the final curing agent for in-situ curing of high-water-content silt soft soil is obtained.
The curing agent and the high-water-content sludge with the water content of 70% are mixed and stirred uniformly and then put into a mould (the size is 70.7-70.7 mm), the mixing amount of the curing agent is 7.8%, and the laminated film is naturally cured at room temperature. The results show that the cured test pieces 3d and 7d can not be successfully demolded, and do not have compressive strength, which indicates that the single magnesium oxychloride cement can not meet the requirement of in-situ curing under the condition of coating.
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 (8)
1. The curing agent for in-situ curing of the high-water-content silt soft soil is characterized by comprising the following raw materials in percentage by mass: 30-70% of sulphoaluminate cement, 20-60% of alkali-activated cementing material, 3-12% of magnesia cementing material and 0-0.1% of surfactant;
wherein, the alkali-activated cementing material consists of 65-90% of cementing components and 10-30% of alkali-activated agents according to mass percent;
the magnesia cementing material consists of 60-75% of magnesium oxide and 10-30% of magnesium chloride or magnesium sulfate according to mass percent;
the content of the surfactant is more than 0;
the water content of the high-water-content silt soft soil is 60% -80%.
2. The curing agent for in-situ curing of high-water-content sludge soft soil according to claim 1, wherein the sulphoaluminate cement is one or more of quick hardening sulphoaluminate cement and low alkalinity sulphoaluminate cement.
3. The curing agent for in-situ curing of high-water-content silt soft soil according to claim 1, wherein the magnesia cementing material is magnesium oxychloride cement or magnesium oxysulfide cement.
4. The curing agent for in-situ curing of high-water-content sludge soft soil according to claim 1, wherein the surfactant is one or more of sodium dodecyl sulfate and sodium dodecyl benzene sulfonate.
5. The curing agent for in-situ curing of high water content sludge soft soil according to claim 1, wherein the gelling component is one or more of blast furnace slag and high titanium slag.
6. The curing agent for in-situ curing of high-water-content sludge soft soil according to claim 1, wherein the alkali-activated agent is one or more of sodium carbonate, sodium sulfate and sodium metaaluminate.
7. The curing agent for in-situ curing of high-water-content silt soft soil according to claim 1, wherein the magnesia is light burned magnesia with the content of more than 75%.
8. The curing agent for in-situ curing of high-water-content silt soft soil according to claim 1, wherein the curing agent is prepared by uniformly mixing raw materials according to a mass ratio and grinding the raw materials to more than 200 meshes, wherein particles with a particle size of less than 10 μm account for more than 30%.
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