CN115724629A - Curing agent stabilized soil for mucky muck and preparation method thereof - Google Patents
Curing agent stabilized soil for mucky muck and preparation method thereof Download PDFInfo
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- CN115724629A CN115724629A CN202211440631.6A CN202211440631A CN115724629A CN 115724629 A CN115724629 A CN 115724629A CN 202211440631 A CN202211440631 A CN 202211440631A CN 115724629 A CN115724629 A CN 115724629A
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 147
- 239000002689 soil Substances 0.000 title claims abstract description 110
- 238000002360 preparation method Methods 0.000 title description 8
- 239000002893 slag Substances 0.000 claims abstract description 64
- 239000000843 powder Substances 0.000 claims abstract description 55
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 51
- 239000010959 steel Substances 0.000 claims abstract description 51
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 44
- 239000010440 gypsum Substances 0.000 claims abstract description 44
- 239000004576 sand Substances 0.000 claims abstract description 40
- 239000011398 Portland cement Substances 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 28
- 239000006227 byproduct Substances 0.000 claims abstract description 25
- 239000004094 surface-active agent Substances 0.000 claims abstract description 13
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 88
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 43
- 239000010802 sludge Substances 0.000 claims description 42
- 238000012360 testing method Methods 0.000 claims description 34
- 239000002131 composite material Substances 0.000 claims description 30
- 238000002156 mixing Methods 0.000 claims description 29
- 239000000203 mixture Substances 0.000 claims description 26
- 239000000292 calcium oxide Substances 0.000 claims description 23
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 22
- 235000012255 calcium oxide Nutrition 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 17
- 238000005056 compaction Methods 0.000 claims description 16
- 239000008239 natural water Substances 0.000 claims description 15
- 238000005303 weighing Methods 0.000 claims description 15
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 13
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000010936 titanium Substances 0.000 claims description 12
- 229910052719 titanium Inorganic materials 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 9
- 239000010881 fly ash Substances 0.000 claims description 9
- 229920005646 polycarboxylate Polymers 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 5
- 238000013329 compounding Methods 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 229920001732 Lignosulfonate Polymers 0.000 claims description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 238000005065 mining Methods 0.000 claims description 3
- 239000005416 organic matter Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 239000003583 soil stabilizing agent Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 claims 2
- 239000002910 solid waste Substances 0.000 abstract description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 6
- 239000011707 mineral Substances 0.000 abstract description 6
- 229910001653 ettringite Inorganic materials 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000006641 stabilisation Effects 0.000 abstract description 3
- 238000011105 stabilization Methods 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 2
- 238000002386 leaching Methods 0.000 description 10
- 229910001385 heavy metal Inorganic materials 0.000 description 9
- 238000010276 construction Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 239000004567 concrete Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 235000010755 mineral Nutrition 0.000 description 5
- 239000002699 waste material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000012190 activator Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910017518 Cu Zn Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a curing agent capable of being applied to mucky muck and stabilized soil obtained by the curing agent, wherein the curing agent takes portland cement, steel slag powder, industrial by-product gypsum, mineral admixture, surfactant and the like as raw materials, improves the recycling utilization level of solid wastes such as mucky muck, regenerated fine aggregate, tailing sand, steel slag powder, industrial by-product gypsum and the like, utilizes the regenerated fine aggregate and the tailing sand to adjust the performances such as mucky muck gradation, plasticity index and the like, takes the industrial by-product gypsum as an excitant, and Al in the steel slag powder 2 O 3 、SiO 2 And Ca (OH) 2 The C-S-H and the ettringite are generated by the reaction to provide strength for the stabilization soil of the mucky soil curing agent.
Description
Technical Field
The invention belongs to the technical field of solid waste recycling, in particular to sludge muck curing agent stabilized soil, and particularly relates to sludge muck curing agent stabilized soil prepared from solid waste such as sludge muck, recycled fine aggregate, tailing sand, steel slag powder, industrial byproduct gypsum and the like and a preparation method thereof.
Background
The sludge residue soil has the characteristics of high water content, high viscosity, large performance difference and the like, so that the resource utilization range is limited. In consideration of the physicochemical properties of the mucky muck, if the mucky muck curing agent stabilized soil is applied to the road subgrade and the subbase layer, the problems of stacking and land occupation of the mucky muck can be solved, the resource utilization of solid wastes can be promoted, and meanwhile, remarkable social, economic and environmental benefits are created.
At present, the following problems still need to be considered in the preparation of the mucky muck curing agent by utilizing multi-source solid wastes: (1) The silt muck curing agent stabilizes the raw materials adopted by the soil and the mixture ratio of the raw materials; (2) Whether the stabilized soil can meet the relevant performance requirements of JTG/T F-2015 'detailed rules for highway pavement base course construction technology' or not can be determined by the silt muck curing agent.
In view of the above circumstances, there is a need to develop a mucky muck curing agent prepared from multi-source solid wastes and a preparation method thereof, which can reduce resource consumption and production cost and improve the resource utilization level of the mucky muck, desulfurized ash, industrial byproduct gypsum, slag powder and other solid wastes. Not only can solve the problems of road solid waste stacking and land occupation, but also has remarkable social, economic and environmental benefits.
Disclosure of Invention
Aiming at the defects in the prior art, the invention mainly aims to provide a curing agent applicable to sludge muck and stabilized soil obtained by using the curing agent, wherein the curing agent takes portland cement, steel slag powder, industrial byproduct gypsum, mineral admixture, surfactant and the like as raw materials, so that the resource utilization level of solid wastes such as the sludge muck, regenerated fine aggregate, tailing sand, steel slag powder, industrial byproduct gypsum and the like is improved, the graded and viscosity of the sludge muck are adjusted by using the regenerated fine aggregate and the tailing sand, the industrial byproduct gypsum is used as an activator, and Al in the steel slag powder is used as an activator 2 O 3 、SiO 2 And Ca (OH) 2 The C-S-H and the ettringite are generated by the reaction to provide strength for the stabilization soil of the mucky soil curing agent.
The invention also aims to provide the preparation method of the silt muck curing agent and the stabilized soil, which is characterized in that the stabilized soil containing the silt muck curing agent and meeting the related performance requirements of JTG/T F-2015 detailed highway pavement base course construction technical rules is prepared by selecting the raw materials and the proportion of the silt muck curing agent and the stabilized soil, the production cost is reduced, the resource utilization of solid wastes can be promoted, and the preparation method has remarkable social, economic and environmental benefits.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to one aspect of the invention, the invention aims to provide a curing agent for mucky muck, which comprises the following components in parts by weight: portland cement: 15-30 parts of steel slag powder: 15-30 parts, industrial by-product gypsum: 20-30 parts of composite admixture: 30-50 parts of surfactant: 0.01 to 0.8 portion.
According to a preferable technical scheme, the curing agent for the mucky soil comprises the following components in parts by weight: 7.5 parts of Portland cement; 7.5 parts of steel slag powder; 15 parts of phosphogypsum; 18 parts of composite admixture; 2 parts of sodium lignosulfonate.
According to a preferable technical scheme, the curing agent for the mucky soil comprises the following components in parts by weight: 10 parts of Portland cement; 7.5 parts of steel slag powder; 12.5 parts of titanium gypsum; 18 parts of composite admixture; 2 parts of sodium lignosulfonate.
According to a preferable technical scheme, the curing agent for the mucky soil comprises the following components in parts by weight: 10.5 parts of Portland cement; 10.5 parts of steel slag powder; 21 parts of phosphogypsum; 25.2 parts of composite admixture; polycarboxylate 2.8 parts.
According to a preferable technical scheme, the curing agent for the mucky soil comprises the following components in parts by weight: 14 parts of Portland cement; 10.5 parts of steel slag powder; 17.5 parts of titanium gypsum; 25.2 parts of composite admixture; polycarboxylate 2.8 parts.
According to a preferable technical scheme, the curing agent for the mucky soil comprises the following components in parts by weight: 14 parts of Portland cement; 14 parts of steel slag powder; 17.5 parts of phosphogypsum; 21 parts of composite admixture; 3.5 parts of sodium lignosulfonate.
As a preferable technical scheme, the curing agent for the mucky soil comprises the following components in parts by weight: 16 parts of Portland cement; 12 parts of steel slag powder; 20 parts of phosphogypsum; 28 parts of composite admixture; 4 parts of sodium lignosulfonate.
Preferably, the steel slag powder has a specific surface area<350cm 2 The slag powder is mixed and ground with 10 percent of semi-hydrated desulfurized gypsum, and the main components are CaO:35% -50% of Fe 2 O 3 ：20％～35％，SiO 2 ：5％～10％， f-CaO≤15％。
Preferably, the industrial by-product gypsum comprises one or more of desulfurized gypsum, phosphogypsum, titanium gypsum and fluorgypsum, the purity is more than 80%, the water content is less than 5%, and the pH value is 5-12. Preferably phosphogypsum.
Preferably, the composite admixture is formed by compounding and grinding steel slag, fly ash, slag powder and an excitant; the steel slag comprises, by weight, 10-20% of steel slag, 50-60% of fly ash, 30-40% of slag powder and 0.01-5% of an exciting agent, wherein the exciting agent is selected from CaO, naOH or gypsum, and is preferably CaO.
Preferably, the surfactant is one or more of lignosulfonate, triethanolamine and polycarboxylate.
According to the curing agent for the muddy dregs, the initial setting time is 2-15 h, the final setting time is 5-20 h, the compressive strength of the mortar is 20-35 MPa within 7d days, and the compressive strength of the mortar is 35-55 MPa within 28d days, so that the performance requirements of DG/T J-2082-2017 GS soil body hardener application technical specification are met.
According to another aspect of the invention, another object of the invention is to provide stabilized soil containing a curing agent for muddy muck, which comprises the following main components in parts by weight: sludge muck: 40-95 parts of recycled fine aggregate: 0.01-30 parts of tailing sand: 0.01-30 parts of curing agent for muck residue soil: 5-16 parts of water: 12 to 25 portions.
Preferably, the silt muck has a natural water content of 35-55%, a plasticity index of 15-25% and an organic matter content of less than 2%.
Preferably, the recycled fine aggregate production process is a technique conventional in the art, such as "construction waste material → primary sorting → crushing → sieving → winnowing". The raw materials are waste concrete, broken concrete piece of road, demolish concrete piece, the broken concrete piece of a type of concrete piece, a supporting beam etc. after artifical letter sorting, the material at first carries out elementary breakage through I level breaker (jaw breaker), sets up mud removing device and deironing device. And (3) conveying the recycled aggregate subjected to primary crushing to a grinding device for shaping, then performing grade I screening, conveying the recycled aggregate with the particle size of more than 37.5mm to a grade II crusher, performing secondary crushing, then performing grade II screening, and circulating the steps to obtain recycled coarse aggregate with the particle size of 5-25 mm, 25-37.5 mm and recycled fine aggregate with the particle size of less than or equal to 4.75 mm. The water absorption rate of the recycled fine aggregate is 6-12%, and the apparent density is 2100-2500 kg/m 3 The content of stone powder is 0-1%, and the crushing index is 25% -35%.
Preferably, the grain diameter of the tailing sand is less than or equal to 4.75mm, the fineness modulus is 1.1-3.4, the plasticity index is 5-12, and the compression coefficient is 0.1-1.0 MPa -1 The compression modulus is 2-19 MPa, the crushing index is less than or equal to 25 percent, and the sand is prepared by mechanically crushing and preparing waste tailings in mining. And CaO of the tailing sand: 20 to 35 percent of Fe 2 O 3 ：5％～18％，SiO 2 ：25％～45％， SO 3 ：0.3％～1.5％。
Preferably, the industrial byproduct gypsum comprises one or more of phosphogypsum and titanium gypsum, the purity is more than 80%, and the pH value is 5-12.
According to another aspect of the invention, another object of the invention is to provide a preparation method of the curing agent for muddy dregs, which comprises the following steps:
(1) Preparing the curing agent for the muck: weighing raw material components of portland cement, steel slag powder, industrial by-product gypsum, a composite admixture and a surfactant according to a weight part ratio;
(2) Preparing a curing agent for the mucky muck: and (2) sequentially adding the raw material components weighed in the step (1) into a stirrer to be stirred for 2-5 min at 20-28 ℃ such as room temperature according to the feeding sequence, and discharging after uniform mixing to obtain the curing agent for the mucky soil.
According to another aspect of the present invention, another object of the present invention is to provide a method for preparing the stabilized soil containing the curing agent for muddy dregs, comprising the steps of:
(1) Pretreating sludge and muck:
the silty muck is silty clay generated in the process of excavating the deep foundation pit, the natural water content is 35% -55%, airing is needed, 1-3% of quicklime is added, the water content of the silty muck is controlled to be lower than 10%, and the water content of the silty muck, the recycled fine aggregate and the tailing sand is tested.
And weighing the silt muck, the recycled fine aggregate and the tailing sand according to the formula of the silt muck curing agent stabilized soil.
(2) And (3) measuring the optimal water content and the maximum dry density:
preparing 5-6 parts of mixture A from the prepared raw materials, estimating the optimal water content of the muck soil stabilizer soil, presetting 5-6 different water contents (between about 10% and 23%), and sequentially differing by 1% -2%, wherein at least two of the different water contents are greater than and two of the different water contents are smaller than the optimal water content;
uniformly mixing each part of the mixture A with a certain amount of water (the preset water adding amount, the water content of the mixture A and the residual water adding amount are 2%), filling the mixture A into a plastic bag, and sealing and soaking for standby, wherein the soaking time is 6-24 hours; before the compaction test is carried out, weighing the required muck curing agent, and mixing to form a mixture B; and weighing the residual water adding amount, uniformly spraying the residual water adding amount on the mixture B, fully mixing to a uniform state, completing a compaction test within 1 hour, and measuring the optimal water content and the maximum dry density of the mixture through the compaction test.
And drawing a dry density-water content curve by taking the water content as an abscissa and the dry density as an ordinate, fitting the curve by adopting a quadratic curve method for each experimental point, wherein the water content and the dry density corresponding to the peak point of the curve are the optimal water content and the maximum dry density.
(3) Forming a test block:
and determining the optimal water content and the maximum dry density required by the stabilized soil containing the curing agent for the muck soil through a compaction test, and calculating the water adding amount according to the optimal water content and the maximum dry density.
Feeding the weighed sludge residue soil, the recycled fine aggregate and the tailing sand into a stirrer, stirring for 2-3 min, uniformly mixing, adding water, uniformly stirring (the optimal water content is-the water content of the mixture A-the residual water content is 2%), and sealing and infiltrating for 6-24 h; and adding a certain amount of curing agent and the residual amount of water in 1 hour before the test piece is molded, uniformly mixing, molding on a press machine, and demolding to obtain the mucky muck curing agent stabilized soil.
According to another aspect of the present invention, another object of the present invention is to provide the use of the stabilized soil containing the curing agent for muddy dregs in road subgrade and subbase.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention selects the components of the stabilized soil containing the curing agent for the mucky muck, adopts the mucky muck, the regenerated fine aggregate, the tailing sand, the portland cement, the steel slag powder, the industrial by-product gypsum, the mineral admixture and the surfactant, prepares the stabilized soil meeting the requirements of the relative performance of JTG/T F-2015' the detailed rules of construction technology for the base layer of the highway pavement by formula adjustment, reduces the production cost, and improves the resource utilization level of the solid wastes such as the mucky muck, the regenerated fine aggregate, the tailing sand, the steel slag powder, the industrial by-product gypsum and the like.
(2) The regenerated fine aggregate and the tailing sand are added into the mucky slag soil, the gradation of the mixture can be adjusted so as to increase the compactness, the industrial by-product gypsum is used as an excitant, and Al in the curing agent 2 O 3 、SiO 2 And Ca (OH) 2 C-S-H and ettringite are generated by reaction, and the strength of the stabilized soil of the muck curing agent is improved, so that the maximization of resource utilization, the optimization of performance and the optimization of economic cost are realized.
Detailed Description
Hereinafter, the present invention will be described in detail. Before the description is made, it should be understood that the terms used in the present specification and the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle that the inventor is allowed to define terms appropriately for the best explanation. Accordingly, the description proposed herein is just a preferable example for the purpose of illustrations only, not intended to limit the scope of the invention, so it should be understood that other equivalents and modifications could be made thereto without departing from the spirit and scope of the invention.
In this document, the terms "comprising," "including," "having," "containing," or any other similar term, are intended to be open-ended franslational phrase (open-ended franslational phrase) and are intended to cover non-exclusive inclusions. For example, a composition or article comprising a plurality of elements is not limited to only those elements recited herein, but may include other elements not expressly listed but generally inherent to such composition or article. In addition, unless expressly stated to the contrary, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". For example, the condition "a or B" is satisfied in any of the following cases: a is true (or present) and B is false (or not present), a is false (or not present) and B is true (or present), both a and B are true (or present). Furthermore, in this document, the terms "comprising," "including," "having," "containing," and the like are to be construed as specifically disclosed and also cover both closed and semi-closed conjunctions of "consisting of …" and "consisting essentially of …".
All features or conditions defined herein as numerical ranges or percentage ranges are for brevity and convenience only. Accordingly, the description of a range of values or percentages should be considered to cover and specifically disclose all possible subranges and individual values within the range, particularly integer values. For example, a description of a range of "1 to 8" should be considered to have specifically disclosed all subranges such as 1 to 7, 2 to 8, 2 to 6, 3 to 6, 4 to 8, 3 to 8, and so on, particularly subranges bounded by all integer values, and should be considered to have specifically disclosed individual values such as 1, 2, 3, 4, 5, 6, 7, 8, and so on, within the range. Unless otherwise indicated, the foregoing explanatory methods apply to all matters contained in the entire disclosure, whether broad or not.
If an amount or other value or parameter is expressed as a range, preferred range, or a list of upper and lower limits, it is to be understood that all ranges subsumed therein for any pair of the upper or preferred value of the range and the lower or preferred value of the range are specifically disclosed herein, regardless of whether ranges are separately disclosed. Further, when a range of numerical values is recited herein, unless otherwise stated, the range is intended to include the endpoints thereof, and all integers and fractions within the range.
The steel slag powder in the curing agent for muddy muck according to the present invention is industrial grade steel slag powder from Shanghai city. The steel slag component in the composite admixture needs to meet the performance requirements of national standard GB/T51003-2014 mineral admixture application technical specification and GB/T1596-2017 fly ash used in cement and concrete.
Preferably, the composite admixture is formed by compounding and grinding steel slag, fly ash, slag powder and an excitant; the steel slag comprises, by weight, 10-20% of steel slag, 50-60% of fly ash, 30-40% of slag powder and 0.01-5% of an exciting agent, wherein the exciting agent is selected from CaO, naOH or gypsum, and is preferably CaO. The exciting agent aims to improve the mechanical property of the composite admixture so that the composite admixture meets the standard requirements, and if the steel slag, the fly ash and the slag powder can meet the standard requirements through a physical activation technology, the exciting agent is not added. The stabilized soil containing the curing agent for the muddy muck comprises the following main components in parts by weight: sludge muck: 40-95 parts of recycled fine aggregate: 0.01-30 parts of tailing sand: 0.01-30 parts of curing agent for muck residue soil: 5-16 parts of water: 12 to 25 portions.
Wherein the grain diameter of the tailing sand is less than or equal to 4.75mm, the fineness modulus is 1.1-3.4,the plasticity index is 5 to 12, and the compression coefficient is 0.1 to 1.0MPa -1 The compression modulus is 2-19 MPa, the crushing index is less than or equal to 25 percent, and the sand is prepared by mechanically crushing and preparing waste tailings in mining. And CaO of the tailing sand: 20 to 35 percent of Fe 2 O 3 ：5％～18％，SiO 2 ：25％～45％， SO 3 ：0.3％～1.5％。
The tailing sand and the regenerated micro powder are mixed to adjust the plasticity index and the grain size of the mucky residue soil and improve the construction performance, the mechanical property and the durability of the stable residue soil. Meanwhile, the tailing sand has huge stockpiling amount and low utilization rate, seriously pollutes the environment and urgently needs resource utilization. The tailing sand in the invention is from a river-Zhenjiang tailing sand reservoir in Jiangsu.
The following examples are given by way of illustration of embodiments of the invention and are not to be construed as limiting the invention, and it will be understood by those skilled in the art that modifications may be made without departing from the spirit and scope of the invention.
The raw materials adopted in the following examples include muck, recycled fine aggregate, tailing sand, portland cement, steel slag powder, industrial by-product gypsum, mineral admixtures and surfactants; wherein the mucky muck is deep foundation pit soil (5-20 m) of the capital construction project of Shanghai city, the natural water content of the mucky muck is 35-55 percent, the plasticity index of the mucky muck is 15-25 percent, and the organic matter content of the muck is<5 percent; the recycled fine aggregate has the water absorption rate of 6-12 percent and the apparent density of 2100-2500 kg/m 3 The content of the stone powder is 0 to 1 percent, and the crushing index is 25 to 35 percent; the grain size of the tailing sand is less than or equal to 4.75mm, the fineness modulus is 3.1-3.4, and the crushing index is less than or equal to 25 percent; caO of steel slag powder: 35% -50% of Fe 2 O 3 ：20％～35％，SiO 2 :5 to 10 percent of the total weight of the catalyst, and f-CaO is less than or equal to 15 percent; the industrial byproduct gypsum is one or more of phosphogypsum and titanium gypsum; the composite admixture is formed by compounding and grinding steel slag, fly ash, slag powder and an excitant; the surfactant is one or more of lignosulfonate, triethanolamine and polycarboxylate. More specifically, the tailing sand is Jiangsu Zhenjiang tailing sand, the phosphogypsum is Guizhou phosphogypsum, and the titanium gypsum is Shanghai titaniumGypsum, the portland cement is southern P.O 42.5 cement, and the surfactant is a commercially available product. Unless otherwise specified, reagents and equipment used in the following examples may be commercially available products.
The performance test of the stabilized soil of the muddy muck curing agent in the following examples comprises the following steps:
(1) Pretreating sludge and residue soil;
(2) Raw materials are proportioned according to the components of the silt muck curing agent stabilized soil;
(3) Adding a curing agent into the aged soil, wherein the mixing amount is 5-16%, and uniformly mixing;
(4) Obtaining the optimal water content and the maximum dry density through a compaction test;
(5) And carrying out an unconfined compressive strength test according to the test results of the optimal water content and the maximum dry density.
Example 1
The stabilized soil of the mucky muck curing agent in the embodiment is prepared by the following method:
(1) Pretreating sludge and muck: the natural water content of the sludge muck is 40 percent, the natural water content of the sludge muck is aired, 2 percent of quicklime is added, and the water content of the sludge muck is controlled to be lower than 10 percent.
(2) Preparing materials: weighing raw materials according to the components of the silt muck curing agent stabilized soil, wherein the components of the raw materials are weighed according to the weight portion contained in 1000 portions of the silt muck curing agent stabilized soil:
(3) Preparing a curing agent: and (3) sequentially adding the Portland cement, the steel slag powder, the phosphogypsum, the composite admixture and the sodium lignosulfonate weighed in the step (2) into a stirrer according to the feeding sequence, stirring for 2-3 min, uniformly mixing, and discharging to obtain the curing agent.
(4) Preparing stabilized soil: and adding the curing agent into the mixture of the muddy dregs and the recycled fine aggregate, and uniformly mixing to obtain the muddy dreg curing agent stabilized soil.
Obtaining the optimal water content and the maximum dry density through a compaction test; according to the test results of the optimal water content and the maximum dry density, an unconfined compressive strength test is carried out, and the leaching performances of the stabilized soil and the heavy metal of the silt muck curing agent in the embodiment are respectively shown in tables 1 and 2.
Example 2
The stabilized soil of the mucky muck curing agent in the embodiment is prepared by the following method:
(1) Pretreating sludge and muck: the natural water content of the sludge muck is 38 percent, the airing treatment is adopted, 2 percent of quicklime is added, and the water content of the sludge muck is controlled to be lower than 10 percent.
(2) Preparing materials: weighing raw materials according to the components of the silt muck curing agent stabilized soil, wherein the raw materials are weighed according to the following weight parts in 1000 parts of the silt muck curing agent stabilized soil:
(3) Preparing a curing agent: and (3) sequentially adding the Portland cement, the steel slag powder, the titanium gypsum, the composite admixture and the sodium lignosulfonate weighed in the step (2) into a stirrer according to the feeding sequence, stirring for 2-3 min, uniformly mixing, and discharging to obtain the curing agent.
(4) Preparing stabilized soil: and adding the curing agent into the mixture of the muddy dregs, the recycled fine aggregate and the tailing sand, and uniformly mixing to obtain the muddy dreg curing agent stabilized soil.
Obtaining the optimal water content and the maximum dry density through a compaction test; according to the test results of the optimal water content and the maximum dry density, an unconfined compressive strength test is carried out, and the leaching performances of the stabilized soil and the heavy metal of the silt muck curing agent in the embodiment are respectively shown in tables 1 and 2.
Example 3
The stabilized soil of the mucky muck curing agent in the embodiment is prepared by the following method:
(1) Pretreating sludge and muck: the natural water content of the sludge muck is 40 percent, the airing treatment is adopted, 2 percent of quicklime is added, and the water content of the sludge muck is controlled to be lower than 10 percent.
(2) Preparing materials: weighing raw materials according to the components of the silt muck curing agent stabilized soil, wherein the raw materials are weighed according to the following weight parts in 1000 parts of the silt muck curing agent stabilized soil:
(3) Preparing a curing agent: and (3) sequentially adding the Portland cement, the steel slag powder, the phosphogypsum, the composite admixture and the polycarboxylate weighed in the step (2) into a stirrer according to the feeding sequence, stirring for 2-3 min, uniformly mixing, and discharging to obtain the curing agent.
(4) Preparing stabilized soil: and adding the curing agent into the mixture of the muddy dregs and the recycled fine aggregate, and uniformly mixing to obtain the muddy dreg curing agent stabilized soil.
Obtaining the optimal water content and the maximum dry density through a compaction test; according to the test results of the optimal water content and the maximum dry density, an unconfined compressive strength test is carried out, and the leaching performances of the stabilized soil and the heavy metal of the silt muck curing agent in the embodiment are respectively shown in tables 1 and 2.
Example 4
The stabilized soil of the mucky muck curing agent in the embodiment is prepared by the following method:
(1) Pretreating sludge and muck: the natural water content of the sludge muck is 38 percent, the natural water content of the sludge muck is treated by airing, 2 percent of quicklime is added, and the water content of the sludge muck is controlled to be lower than 10 percent.
(2) Preparing materials: weighing raw materials according to the components of the silt muck curing agent stabilized soil, wherein the raw materials are weighed according to the following weight parts in 1000 parts of the silt muck curing agent stabilized soil:
(3) Preparing a curing agent: and (3) sequentially adding the Portland cement, the steel slag powder, the titanium gypsum, the composite admixture and the polycarboxylate weighed in the step (2) into a stirrer according to the feeding sequence, stirring for 2-3 min, uniformly mixing, and discharging to obtain the curing agent.
(4) Preparing stabilized soil: and adding the curing agent into the mixture of the muddy dregs, the recycled fine aggregate and the tailing sand, and uniformly mixing to obtain the muddy dreg curing agent stabilized soil.
Obtaining the optimal water content and the maximum dry density through a compaction test; according to the test results of the optimal water content and the maximum dry density, an unconfined compressive strength test is carried out, and the leaching performances of the stabilized soil and the heavy metal of the silt muck curing agent in the embodiment are respectively shown in tables 1 and 2.
Example 5
The stabilized soil of the mucky muck curing agent in the embodiment is prepared by the following method:
(1) Pretreating sludge and muck: the natural water content of the sludge muck is 45 percent, the natural water content of the sludge muck is aired, 2 percent of quicklime is added, and the water content of the sludge muck is controlled to be lower than 10 percent.
(2) Preparing materials: weighing raw materials according to the components of the silt muck curing agent stabilized soil, wherein the raw materials are weighed according to the following weight parts in 1000 parts of the silt muck curing agent stabilized soil:
(3) Preparing a curing agent: and (3) sequentially adding the Portland cement, the steel slag powder, the phosphogypsum, the composite admixture and the sodium lignosulfonate weighed in the step (2) into a stirrer according to the feeding sequence, stirring for 2-3 min, uniformly mixing, and discharging to obtain the curing agent.
(4) Preparing stabilized soil: and adding the curing agent into the mixture of the muddy dregs and the recycled fine aggregate, and uniformly mixing to obtain the muddy dreg curing agent stabilized soil.
Obtaining the optimal water content and the maximum dry density through a compaction test; according to the test results of the optimal water content and the maximum dry density, an unconfined compressive strength test is carried out, and the leaching performances of the stabilized soil and the heavy metal of the silt muck curing agent in the embodiment are respectively shown in tables 1 and 2.
Example 6
The stabilized soil of the mucky muck curing agent in the embodiment is prepared by the following method:
(1) Pretreating sludge and muck: the natural water content of the sludge muck is 38 percent, the airing treatment is adopted, 2 percent of quicklime is added, and the water content of the sludge muck is controlled to be lower than 10 percent.
(2) Preparing materials: weighing raw materials according to the components of the silt muck curing agent stabilized soil, wherein the raw materials are weighed according to the following weight parts in 1000 parts of the silt muck curing agent stabilized soil:
(3) Preparing a curing agent: and (3) sequentially adding the Portland cement, the steel slag powder, the phosphogypsum, the composite admixture and the sodium lignosulfonate weighed in the step (2) into a stirrer according to the feeding sequence, stirring for 2-3 min, uniformly mixing, and discharging to obtain the curing agent.
(4) Preparing stabilized soil: and adding the curing agent into the mixture of the muddy dregs, the recycled fine aggregate and the tailing sand, and uniformly mixing to obtain the muddy dreg curing agent stabilized soil.
Obtaining the optimal water content and the maximum dry density through a compaction test; according to the test results of the optimal water content and the maximum dry density, an unconfined compressive strength test is carried out, and the leaching performances of the stabilized soil and the heavy metal of the silt muck curing agent in the embodiment are respectively shown in tables 1 and 2.
Example 7
The stabilized soil of the mucky muck curing agent in the embodiment is prepared by the following method:
(1) Pretreating sludge and muck: the natural water content of the sludge muck is 38 percent, the airing treatment is adopted, 2 percent of quicklime is added, and the water content of the sludge muck is controlled to be lower than 10 percent.
(2) Preparing materials: weighing raw materials according to the components of the silt muck curing agent stabilized soil, wherein the components of the raw materials are weighed according to the weight portion contained in 1000 portions of the silt muck curing agent stabilized soil:
(3) Preparing a curing agent: and (3) sequentially adding the Portland cement, the steel slag powder, the phosphogypsum, the composite admixture and the sodium lignosulfonate weighed in the step (2) into a stirrer according to the feeding sequence, stirring for 2-3 min, uniformly mixing, and discharging to obtain the curing agent.
(4) Preparing stabilized soil: and adding the curing agent into the muddy muck, and uniformly mixing to obtain the muddy muck curing agent stabilized soil.
Obtaining the optimal water content and the maximum dry density through a compaction test; according to the test results of the optimal water content and the maximum dry density, an unconfined compressive strength test is carried out, and the leaching performances of the stabilized soil and the heavy metal of the silt muck curing agent in the embodiment are respectively shown in tables 1 and 2.
Table 1: sludge residue soil curing agent for stabilizing soil performance
| 7d unconfined compressive strength/MPa | 28d unconfined compressive strength/MPa | |
| Example 1 | 1.2 | 2.2 |
| Example 2 | 1.4 | 2.5 |
| Example 3 | 1.7 | 2.9 |
| Example 4 | 1.7 | 3.0 |
| Example 5 | 1.9 | 3.1 |
| Example 6 | 2.1 | 3.2 |
| Example 7 | 0.7 | 0.9 |
As can be seen from the data in Table 1, the stabilized soil prepared by the mucky muck curing agent can meet the strength requirements (1.0-3.0 MPa) of roads at the second and lower levels of light traffic in the technical rules of construction of road base courses (JTGT F20-2015).
Table 2: stabilization of soil heavy metal leaching liquid toxicity by silt muck curing agent
| Leaching concentration of sample/mg/L | Cd | Cr | Ni | Pb | Cu | Zn | As | Hg |
| Case 1 | <0.01 | <0.02 | <0.02 | <0.03 | 0.04 | <0.01 | <0.0001 | 0.00046 |
| Case 2 | <0.01 | <0.02 | <0.02 | <0.03 | 0.03 | <0.01 | <0.0001 | 0.00057 |
| Case 3 | <0.01 | <0.02 | <0.02 | <0.03 | 0.03 | <0.01 | <0.0001 | 0.00051 |
| Case 4 | 0.01 | 0.01 | <0.02 | 0.013 | 0.04 | <0.01 | <0.0001 | 0.00055 |
| Case 5 | 0.02 | 0.01 | <0.02 | 0.027 | 0.05 | 0.02 | <0.0001 | 0.00076 |
| Case 6 | <0.01 | <0.02 | <0.02 | <0.03 | 0.04 | <0.01 | <0.0001 | 0.00039 |
| CECS 397-2015 | - | ≤0.1 | ≤1.5 | - | ≤2 | - | - | ≤0.6 |
As can be seen from Table 1, the unconfined compressive strengths of the mucks 7d and 28d with stable curing agents are improved, which shows that the multisource solid wastes have synergistic effect, and the multisource solid waste curing agents are suitable for muck mucks.
The regenerated fine aggregate and the tailing sand are utilized to adjust the plasticity index and the gradation, and the industrial byproduct gypsum is used as an excitant which can excite the active SiO in the muck curing agent 2 And active Al 2 O 3 To generate C-S-H and C-A-H gel, or react with C-A-H to generate ettringite, to convert the free water in clay into crystal water, and generate hydration product continuously to form high strength.
As can be seen from Table 2, the toxicity of the heavy metal leaching solution of the curing agent stabilized muck meets the standard requirements.
The present invention can be understood by combining examples 1 to 6Selecting the components of the mucky muck curing agent, adopting mucky muck, regenerated fine aggregate, tailing sand, portland cement, steel slag powder, industrial by-product gypsum, mineral admixture and surfactant, and preparing the stabilized soil containing the curing agent for mucky muck meeting the requirements of JTG/T F-2015 relevant performances of highway pavement base course construction technical rules by adjusting the formula of the mucky muck curing agent, reducing the production cost of the mucky muck stabilized soil, and improving the utilization level of solid wastes such as mucky muck, regenerated fine aggregate, tailing sand, steel slag powder, industrial by-product gypsum and the like; uses industrial by-product gypsum as excitant and Al in slag soil solidifying agent 2 O 3 、SiO 2 And Ca (OH) 2 C-S-H and ettringite are generated by the reaction, and the strength of the silt residue soil stabilized soil is improved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the present invention shall be covered thereby. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The curing agent for the mucky muck comprises the following components in parts by weight: portland cement: 15-30 parts of steel slag powder: 15-30 parts, industrial by-product gypsum: 20-30 parts of composite admixture: 30-50 parts of surfactant: 0.01 to 0.8 portion.
2. The curing agent for the mucky muck according to claim 1, which comprises the following components in parts by weight: 7.5 parts of Portland cement; 7.5 parts of steel slag powder; 15 parts of phosphogypsum; 18 parts of a composite admixture; 2 parts of sodium lignosulfonate; or
The curing agent for the mucky muck comprises the following components in parts by weight: 10 parts of Portland cement; 7.5 parts of steel slag powder; 12.5 parts of titanium gypsum; 18 parts of composite admixture; 2 parts of sodium lignosulphonate; or
The curing agent for the mucky muck comprises the following components in parts by weight: 10.5 parts of Portland cement; 10.5 parts of steel slag powder; 21 parts of phosphogypsum; 25.2 parts of composite admixture; 2.8 parts of polycarboxylate; or
The curing agent for the mucky muck comprises the following components in parts by weight: 14 parts of Portland cement; 10.5 parts of steel slag powder; 17.5 parts of titanium gypsum; 25.2 parts of composite admixture; 2.8 parts of polycarboxylate; or alternatively
The curing agent for the mucky muck comprises the following components in parts by weight: 14 parts of Portland cement; 14 parts of steel slag powder; 17.5 parts of phosphogypsum; 21 parts of composite admixture; 3.5 parts of sodium lignosulphonate; or
The curing agent for the mucky muck comprises the following components in parts by weight: 16 parts of Portland cement; 12 parts of steel slag powder; 20 parts of phosphogypsum; 28 parts of composite admixture; 4 parts of sodium lignosulfonate.
3. The curing agent for muddy dregs according to claim 1 or 2, wherein the steel slag powder has a specific surface area<350cm 2 The slag powder is mixed and ground with 10 percent of semi-hydrated desulfurized gypsum, and the main components are CaO:35% -50% of Fe 2 O 3 ：20％～35％，SiO 2 ：5％～10％，f-CaO≤15％；
Preferably, the industrial by-product gypsum comprises one or more of desulfurized gypsum, phosphogypsum, titanium gypsum and fluorgypsum, the purity is more than 80%, the water content is less than 5%, and the pH value is 5-12; preferably phosphogypsum;
preferably, the composite admixture is formed by compounding and grinding steel slag, fly ash, slag powder and an excitant; wherein, the steel slag accounts for 10 to 20 percent, the fly ash accounts for 50 to 60 percent, the slag powder accounts for 30 to 40 percent, and the excitant accounts for 0.01 to 5 percent, wherein the excitant is selected from CaO, naOH or gypsum, preferably CaO;
preferably, the surfactant is one or more of lignosulfonate, triethanolamine and polycarboxylate.
4. The curing agent for muddy dregs as defined in claim 1 or 2, wherein the curing agent for muddy dregs has an initial setting time of 2-15 hours, a final setting time of 5-20 hours, a 7d compressive strength of mortar of 20-35 MPa, and a 28d dd compressive strength of mortar of 35-55 MPa.
5. The stabilized soil containing the curing agent for the mucky muck comprises the following main components in parts by weight: sludge muck: 40-95 parts of recycled fine aggregate: 0.01-30 parts of tailing sand: 0.01 to 30 parts of the curing agent for muddy dregs according to any one of claims 1 to 4: 5-16 parts of water: 12 to 25 portions.
6. The stabilized soil containing the curing agent for muddy dregs as claimed in claim 5, characterized in that, preferably, the muddy dregs have a natural water content of 35-55%, a plasticity index of 15-25%, and an organic matter content of <2%;
preferably, the particle size of the recycled fine aggregate is not more than 4.75mm, the water absorption is 6-12%, and the apparent density is 2100-2500 kg/m 3 The content of the stone powder is 0 to 1 percent, and the crushing index is 25 to 35 percent;
preferably, the grain diameter of the tailing sand is less than or equal to 4.75mm, the fineness modulus is 1.1-3.4, the plasticity index is 5-12, and the compression coefficient is 0.1-1.0 MPa -1 The compression modulus is 2-19 MPa, the crushing index is less than or equal to 25%, the tailing discarded in mining is mechanically crushed and prepared into sand, and the tailing sand CaO:20% -35% of Fe 2 O 3 ：5％～18％，SiO 2 ：25％～45％，SO 3 ：0.3％～1.5％；
Preferably, the industrial byproduct gypsum comprises one or more of phosphogypsum and titanium gypsum, the purity is more than 80%, and the pH value is 5-12.
7. The method for preparing the curing agent for muddy dregs according to any one of claims 1 to 4, comprising the steps of:
(1) The method comprises the following steps of (1) mixing of a curing agent for muddy residue soil: weighing raw material components of portland cement, steel slag powder, industrial by-product gypsum, a composite admixture and a surfactant according to a weight part ratio;
(2) Preparing a curing agent for the mucky muck: and (2) sequentially adding the raw material components weighed in the step (1) into a stirrer in the feeding sequence, stirring for 2-5 min at 20-28 ℃ for example at room temperature, uniformly mixing, and discharging to obtain the curing agent for the mucky muck.
8. The method for preparing stabilized soil containing a solidifying agent for muddy dregs according to claim 5 or 6, comprising the steps of:
(1) Pretreating sludge and muck:
the silty muck is silty clay generated in the process of excavating the deep foundation pit, the natural water content is 35% -55%, airing is required, 1-3% of quicklime is added, the water content of the silty muck is controlled to be lower than 10%, and the water content of the silty muck, the recycled fine aggregate and the tailing sand is tested;
weighing the sludge muck, recycled fine aggregate and tailing sand according to the sludge muck curing agent stabilized soil formula of any one of claims 1 to 4;
(2) And (3) determining the optimal water content and the maximum dry density:
preparing 5-6 parts of mixture A from the prepared raw materials, estimating the optimal water content of the muck soil stabilizer soil, presetting 5-6 different water contents (between about 10% and 23%), and sequentially differing by 1% -2%, wherein at least two of the different water contents are greater than and two of the different water contents are smaller than the optimal water content;
uniformly mixing each part of the mixture A with a certain amount of water (the preset water adding amount, the water content of the mixture A and the residual water adding amount are 2%), filling the mixture A into a plastic bag, and sealing and soaking for standby, wherein the soaking time is 6-24 hours; before the compaction experiment is carried out, weighing the required muck curing agent, and mixing to form a mixture B; weighing the residual water adding amount, uniformly spraying the residual water adding amount on the mixture B, fully mixing to a uniform state, completing a compaction test within 1 hour, and measuring the optimal water content and the maximum dry density of the mixture through the compaction test;
drawing a dry density-water content curve by taking the water content as an abscissa and the dry density as an ordinate, fitting the curve by adopting a quadratic curve method for each experimental point, wherein the water content and the dry density corresponding to the peak point of the curve are the optimal water content and the maximum dry density;
(3) Forming a test block:
determining the optimal water content and the maximum dry density required by stabilized soil containing the curing agent for the mucky soil through compaction experiments, and calculating the water addition amount according to the optimal water content and the maximum dry density;
feeding the weighed sludge residue soil, the recycled fine aggregate and the tailing sand into a stirrer, stirring for 2-3 min, uniformly mixing, adding water, uniformly stirring (the optimal water content is-the water content of the mixture A-the residual water content is 2%), and sealing and infiltrating for 6-24 h; and adding a certain amount of curing agent and the residual amount of water in 1 hour before the test piece is molded, uniformly mixing, molding on a press machine, and demolding to obtain the mucky muck curing agent stabilized soil.
9. Use of the stabilized soil containing the solidifying agent for muddy dregs as claimed in claim 5 or 6 in road foundations, underlayments.
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