CN111003993A - Modifier for high liquid limit clay and application thereof - Google Patents

Modifier for high liquid limit clay and application thereof Download PDF

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Publication number
CN111003993A
CN111003993A CN201911181760.6A CN201911181760A CN111003993A CN 111003993 A CN111003993 A CN 111003993A CN 201911181760 A CN201911181760 A CN 201911181760A CN 111003993 A CN111003993 A CN 111003993A
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China
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liquid limit
high liquid
clay
modifier
cement
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CN201911181760.6A
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CN111003993B (en
Inventor
蒋红光
姚占勇
陈思涵
迟浩然
姚凯
梁明
张吉哲
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Shandong University
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Shandong University
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00—Foundations for pavings
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The disclosure belongs to the technical field of high liquid limit clay modification, and particularly relates to a modifier for high liquid limit clay and application. The utility model provides a modifier for high liquid limit clay road of industry solid waste base utilizes ion exchange effect, the hydration reaction of cement, the volcanic ash reaction that the modifier takes place, gelatinization etc. of high valence cation in the modifier, and furthest improves the limit moisture content of high liquid limit clay, improves its unconfined compressive strength, makes it satisfy the road performance requirement of high liquid limit clay in the standard. The modifier for the clay road with the high liquid limit comprises 750-820 parts of tailings, 80-110 parts of cement and 10-70 parts of polyaluminium chloride, the liquid limit of the modified soil is obviously reduced, and the unconfined compressive strength is improved. The high liquid limit clay modifier principal ingredients that this disclosure provided is useless admittedly for industry, through the modification can effectively reduce the useless processing degree of difficulty admittedly of industry, reduces the clay modification cost, has good popularization meaning.

Description

Modifier for high liquid limit clay and application thereof
Technical Field
The utility model belongs to the technical field of high liquid limit clay is modified, concretely relates to high liquid limit clay modifier and road bed filling technique based on industry is useless admittedly.
Background
The information in this background section is only for enhancement of understanding of the general background of the disclosure and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The 'design standard of highway subgrade' in China stipulates that: the liquid limit is more than 50%, and the fine soil with plasticity index more than 26 cannot be directly used as embankment filler. In recent years, a great deal of research is carried out on the aspects of modification, utilization and the like of high liquid limit clay in the highway engineering construction process at home and abroad. However, the existing high liquid limit clay is generally improved by using lime, cement or sand gravel, but with the stricter and stricter environmental protection, lime mining is gradually limited, and the prices of raw materials such as lime, cement and sand gravel are also gradually increased, so that the comprehensive cost of modifying the high liquid limit clay is increased. In order to reduce the economic cost of high liquid limit clay modification, industrial solid waste is used as a modification raw material, so that the industrial waste can be effectively recycled, and the difficulty in industrial solid waste treatment and the high liquid limit clay modification cost are reduced. Patent CN104988901A provides a method for improving expansive soil by using iron tailings, which can improve the strength of expansive soil by humidifying or drying the mixture to reach the optimum water content.
For the current state of research, the inventors consider that: at present, the research on modifying the clay with high liquid limit is not sufficient. In addition, the high liquid limit clay has obvious regional difference, and a suitable modification method needs to be explored for a specific soil type. The scouring silting accumulation action of the yellow river forms a large amount of high liquid limit clay in Shandong province, the yellow river scouring silting plain area land resources are very nervous, soil taking is difficult, soil is generally lacking on the whole line, and the high liquid limit clay widely distributed along the line has the characteristics of high natural water content, easiness in water absorption, strong water retention, easiness in forming a surface crust layer in the rolling process, upward movement of water and the like, can not be directly filled in a roadbed, and if the soil is abandoned, huge resource waste and environmental problems can be caused.
Disclosure of Invention
To the research background, the present disclosure provides a novel high liquid limit clay modifier based on solid waste material for engineering characteristics of high liquid limit clay and existing solid waste material in Shandong province, which can effectively improve the water content of soil boundary and improve the soil strength, and realizes large-scale application of solid waste material while modifying the high liquid limit clay.
In a first aspect of the present disclosure, a composition is provided that includes tailings, cement, and polyaluminum chloride.
Preferably, the composition comprises the following raw materials in parts by weight: tailing: cement: the polyaluminum chloride is 810-830: 120-140: 30-50.
More preferably, the tailings: cement: the polyaluminum chloride is 812-826: 130-138: 34-45.
Preferably, SiO in the tailings2The content is 64-68 percent, and the content of MgO is 10-15 percent.
Preferably, the granularity of the tailings is less than or equal to 4.75 mm.
Preferably, the cement is P.O 32.5.5 cement.
Preferably, AlCl in the polyaluminium chloride3The mass is 26-30%.
In a second aspect of the disclosure, there is provided a use of the composition of the first aspect in preparing a clay modifier.
The research of the disclosure shows that when the composition is applied to the modification of high liquid limit clay, the composition can perform the following ion exchange effect, and after cement and tailings are digested by water, Ca can be generated2+、Mg2+Hydrolysis of ionic, polyaluminum chlorides to yield Al3+Low valence K adsorbed by ions and clay particles+、Na+Plasma and Ca2+、Mg2+、Al3+Ion exchange adsorption, and adsorption of large amount of high valence cations around soil particlesAnd then, the thickness of the double clay layers is thinned, a bonding water film forming a soil agglomerate structure is also thinned, and the bonding force among clay particles is enhanced. The method has influence on the plasticity index and soil strength of the clay. The present disclosure uses tailings, cement, polyaluminium chloride, etc. as basic raw materials, wherein the hydration of cement yields calcium silicate and calcium aluminate, which are further hydrated to develop strength. xCaO. Al produced by the simultaneous reaction2O3Can react with CaSO in the tailings4The ettringite is obtained by reaction, thereby further improving the strength of the high liquid limit clay. After being hydrated, the tailings and the polyaluminium chloride have strong volcanic ash reaction with cement hydration products, further promote the cement hydration reaction, generate a large amount of C-S-H and C-A-H flocculation-shaped gelled substances which are filled in pores or wrapped around needle column-shaped ettringite crystals, enable the net structure to be more compact and enhance the bonding effect between cement stone frameworks. Amorphous calcium silicate hydrate and calcium aluminate hydrate gel around the acicular ettringite crystals in the modified soil are more, the generated gelled substance almost completely wraps the acicular ettringite crystals to form a compact mosaic structure, the network structure is refined into an agglomerated structure through the gelled substance, soil particles are cemented more tightly, and the bearing capacity of the modified soil is improved.
In a third aspect of the disclosure, a high liquid limit clay modifier is provided, which adopts the composition of the first aspect as an active ingredient.
In a fourth aspect of the disclosure, a method for modifying high liquid limit clay is provided, which comprises using the high liquid limit clay modifier of the third aspect.
Preferably, the addition amount of the high liquid limit clay modifier is 5-7% of the modified soil.
The fifth aspect of the disclosure provides an application of the high liquid limit clay modifier in the third aspect in the field of roadbed filling.
The existing soil modifier mainly comprises lime, fly ash, secondary ash and a blending material: the cement, gravel, peat, gypsum, plant ash, lime, river sand and the like are mixed together to generate different effects on the improvement of the high liquid limit clay due to the difference of the characteristics and the modification effect of each material. Therefore, in order to satisfy the requirement of high liquid limit clay roadbed filling, in some embodiments, the preferable modifier for high liquid limit clay road of this application can improve the limit moisture content of high liquid limit clay effectively, improves the compressive strength of high liquid limit clay.
Compared with the prior art, the beneficial effect of this disclosure is:
1. the disclosure provides a high liquid limit clay modifier based on industrial solid waste, and the main component tailings in the modifier are waste after ore grinding. The research of this disclosure has verified that when tailings, cement and polyaluminium chloride composition mix, the formation of gel flocculus can be realized through the ion exchange effect wherein, think in parallel and apply it to the modification of high liquid limit clay, realize the promotion of water proofness and intensity. In the using process, the mixing amount of the modifier is 5-8% of the mass of dry soil, the liquid limit of the modified soil is 44-48%, the plastic limit is 25-32%, and the plasticity index is 14-21. The 7d unconfined compressive strength of the modified soil is 0.4-0.8 MPa.
2. The modifier provided by the disclosure makes full use of the ion exchange effect of high-valence cations in the modifier, the hydration reaction of cement, the volcanic ash reaction generated by the modifier, the gelation effect and the like, improves the limit water content of high liquid limit clay to the maximum extent, improves the unconfined compressive strength, is a combination with simple composition and synergistic effect, and is strong in practicability and easy to popularize.
3. The optimal modification scheme of the high liquid limit clay meeting the road standard requirement is rapidly and accurately determined through indoor tests, the modification scheme can be popularized and applied to high liquid limit clay roadbed filling on a large scale, local materials are used for highway construction projects, roadbed filling through remote dispatching is avoided, a large amount of valuable land resources are saved, the construction progress is effectively accelerated, the construction cost is remarkably reduced, the influence on the surrounding environment is reduced to the maximum extent, and the application prospect is wide.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 shows the values of the liquid levels in example 1 and comparative examples 1, 2 and 3.
FIG. 2 shows the plasticity number values of example 1 and comparative examples 1, 2 and 3.
Fig. 3 shows the plasticity index values of example 1 and comparative examples 1, 2 and 3.
FIG. 4 is a graph of the 7d unconfined compressive strength values for example 1 and comparative examples 1, 2, and 3.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced by the background art, aiming at the defects in the prior art, the disclosure provides a clay modifier with high liquid limit.
In order to make the technical solutions of the present disclosure more clearly understood by those skilled in the art, the technical solutions of the present disclosure will be described in detail below with reference to specific examples and comparative examples.
The high liquid limit clay used in the following examples was taken from the Ningliang high speed line; tailings come from a certain mine plant near Yi; cement and polyaluminium chloride are commercially available products.
Example 1
The embodiment provides a modifier for an industrial solid waste base high liquid limit clay road, and a preparation and use method of the modifier.
Weighing raw materials, wherein the raw materials comprise 820g of tailings, 137g of cement and 40g of polyaluminium chloride. Putting the weighed raw materials into a clean container, and uniformly mixing the weighed raw materials. And (3) putting the prepared dried and dehydrated clay sample with high liquid limit into a basin, adding a modifier accounting for 6% of the mass of the dry soil, and uniformly mixing.
According to the highway geotechnical test regulation (JTG E40-2007), a liquid limit and plastic limit combined determinator method is adopted to determine that the liquid limit of the modified soil is 45.16%, the plastic limit is 30.06% and the plasticity index is 15.1.
And adding a certain mass of water into the uniformly mixed soil sample to enable the water content of the soil sample to reach the optimal water content of 20%. The obtained soil sample was placed in a sealed bag and maintained for 7 days. According to the Highway soil engineering test regulation (JTG E40-2007), the unconfined compressive strength of the modified soil 7d is measured to be 0.75 MPa.
Example 2
Weighing raw materials, wherein the raw materials comprise 812g of tailings, 130g of cement and 45g of polyaluminium chloride. Putting the weighed raw materials into a clean container, and uniformly mixing the weighed raw materials. And (3) putting the prepared dried and dehydrated clay sample with high liquid limit into a basin, adding a modifier accounting for 5% of the mass of the dry soil, and uniformly mixing.
Example 3
Weighing raw materials, wherein the raw materials comprise 826g of tailings, 138g of cement and 35g of polyaluminium chloride. Putting the weighed raw materials into a clean container, and uniformly mixing the weighed raw materials. And (3) putting the prepared dried and dehydrated clay sample with high liquid limit into a basin, adding a modifier accounting for 7% of the mass of the dry soil, and uniformly mixing.
Comparative example 1
In this comparative example, polyaluminium chloride was used, and the other settings were the same as in example 1, and the raw material components and weights thereof included 820g of tailings and 137g of cement.
The modifier for the high liquid limit clay road prepared by the comparative example is added into the high liquid limit clay, and the liquid limit, the plastic limit and the plasticity index of the modified soil are respectively measured to be 45.99%, 29.33% and 16.66. The unconfined compressive strength of the modified soil 7d is 0.63 MPa.
Comparative example 2
The modifier provided by the comparative example does not contain cement, the rest of the settings are the same as those of the example 1, and the raw material components and the weight comprise 820g of tailings and 40g of polyaluminium chloride.
The modifier for the high liquid limit clay road prepared by the comparative example is added into the high liquid limit clay, and the liquid limit, the plastic limit and the plasticity index of the modified soil are respectively 46.31%, 27.77% and 18.54. The unconfined compressive strength of the modified soil 7d is 0.45 MPa.
Comparative example 3
The modifier provided by the comparative example does not contain cement and polyaluminium chloride, the rest of the settings are the same as those of the example 1, and 820g of tailings are adopted as the modifier. The modifier for the high liquid limit clay road prepared by the comparative example is added into the high liquid limit clay, and the liquid limit, the plastic limit and the plasticity index of the modified soil are respectively 47.24%, 25.97% and 21.27.
The unconfined compressive strength of the modified soil 7d is 0.41 MPa.
The liquid limit value, plastic limit value, plasticity index and 7d unconfined compressive strength value of the modified soil in the example 1 and the comparative examples 1-3 are shown in attached figures 1-4. In combination with the above
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims (9)

1. A composition comprising tailings, cement, and polyaluminum chloride.
2. The composition of claim 1, wherein the composition comprises the following raw materials in parts by weight: tailing: cement: polymeric aluminum chloride is 810-830: 120-140: 30-50;
preferably, the tailings: cement: the polyaluminum chloride is 812-826: 125-138: 34-45.
3. The composition according to claim 1, wherein the composition,characterized in that SiO in the tailings2The content is 64-68 percent, and the content of MgO is 10-15 percent.
4. The composition of claim 1, wherein the tailings have a particle size of 4.75mm or less.
5. The composition of claim 1, wherein the polyaluminum chloride comprises AlCl3The content is 26-30%.
6. Use of a composition according to any one of claims 1 to 6 for the preparation of clay modifiers.
7. A high liquid limit clay modifier, which adopts the composition of any one of claims 1 to 6 as an active ingredient.
8. A method for modifying high liquid limit clay, which comprises using the high liquid limit clay modifier of claim 1; preferably, the addition amount of the high liquid limit clay modifier is 5-7% of the modified soil.
9. The use of the high liquid limit clay modifier of claim 7 in the field of roadbed filling.
CN201911181760.6A 2019-11-27 2019-11-27 Modifier for high liquid limit clay and application thereof Active CN111003993B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116553878A (en) * 2023-02-22 2023-08-08 西安石油大学 Modified raw soil material formula utilizing cement and iron tailings

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101255043A (en) * 2007-12-28 2008-09-03 江苏省常州市航道管理处 Formula of modifier for road engineering fill
CN101768950A (en) * 2010-01-19 2010-07-07 广东省长大公路工程有限公司 Improving method of high liquid limit soil in subgrade engineering
CN103774644A (en) * 2014-01-13 2014-05-07 东南大学 Construction method for drainage cement mixing pile
CN104674962A (en) * 2015-01-27 2015-06-03 安徽同济建设集团有限责任公司 Method for constructing external heat-insulation systems of external walls from expanded perlite heat-insulation plates

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101255043A (en) * 2007-12-28 2008-09-03 江苏省常州市航道管理处 Formula of modifier for road engineering fill
CN101768950A (en) * 2010-01-19 2010-07-07 广东省长大公路工程有限公司 Improving method of high liquid limit soil in subgrade engineering
CN103774644A (en) * 2014-01-13 2014-05-07 东南大学 Construction method for drainage cement mixing pile
CN104674962A (en) * 2015-01-27 2015-06-03 安徽同济建设集团有限责任公司 Method for constructing external heat-insulation systems of external walls from expanded perlite heat-insulation plates

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116553878A (en) * 2023-02-22 2023-08-08 西安石油大学 Modified raw soil material formula utilizing cement and iron tailings

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