CN112551987A - Preparation method for quickly recycling over-wet soft soil into light filling soil - Google Patents

Preparation method for quickly recycling over-wet soft soil into light filling soil Download PDF

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CN112551987A
CN112551987A CN202011543012.0A CN202011543012A CN112551987A CN 112551987 A CN112551987 A CN 112551987A CN 202011543012 A CN202011543012 A CN 202011543012A CN 112551987 A CN112551987 A CN 112551987A
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soil
soft soil
preparation
light filling
water
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CN112551987B (en
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白兰兰
侯立勋
曹天赐
涂圣武
徐亮
彭劼
庄月明
李刚
戴迪
赵晓婉
周俊杰
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Hohai University HHU
JSTI Group Co Ltd
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JSTI Group Co Ltd
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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
    • 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
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Road Paving Structures (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

本发明公开了一种将过湿软土快速资源化为轻质填筑土的方法，步骤如下：首先将5~15%废旧轮胎胶粉与3~8%高分子吸水树脂通过物理共混法制成具有一定强度的高吸水橡胶颗粒，颗粒粒径不大于0.25mm。再将过湿软土、高吸水橡胶颗粒混合搅拌，改变土体中孔隙水的分布，快速将过湿软土的含水率降低至最优含水率附近，形成具有良好压实性的轻质土，然后再将胶凝材料跟轻质土混合搅拌，形成轻质填筑土，进行摊铺、碾压用于路基填筑。本发明实现了过湿软土的资源化利用。所述方法施工简便，能够快速资源化利用开挖软土，施工周期短，工程效果好，具有良好的经济效益和环境效益。

Figure 202011543012

The invention discloses a method for rapidly converting super-moistened soft soil into lightweight filling soil. The steps are as follows: firstly, 5-15% waste tire rubber powder and 3-8% polymer water-absorbing resin are prepared by a physical blending method. It is made into high water-absorbing rubber particles with certain strength, and the particle size is not more than 0.25mm. Then mix and stir the super-moistened soft soil and superabsorbent rubber particles to change the distribution of pore water in the soil, quickly reduce the moisture content of the super-moistened soft soil to near the optimal moisture content, and form a light soil with good compaction. , and then mix and stir the cementitious material with the light soil to form a light filling soil, which is paved and rolled for roadbed filling. The invention realizes the resource utilization of the over-moistened soft soil. The method has the advantages of simple construction, rapid resource utilization and excavation of soft soil, short construction period, good engineering effect, and good economic and environmental benefits.

Figure 202011543012

Description

Preparation method for quickly recycling over-wet soft soil into light filling soil
Technical Field
The invention belongs to a waste soil recycling technology, and particularly relates to a preparation method for quickly recycling over-wet soft soil into light filling soil, which is suitable for processing and utilizing the excavated over-wet soft soil in various construction projects.
Background
With the continuous development of economy in China, large-scale infrastructure is still in progress. In the process of national infrastructure, more excavated earthwork is often encountered, and the excavated earthwork is mostly over-wet soft soil, namely the general water content is higher (the water content is not less than 40%), the characteristics of high content of clay particles and organic matters, low permeability coefficient and the like exist, the compaction characteristics, the strength and the like of the earthwork are difficult to meet the engineering requirements, and the earthwork is often abandoned. With the increasing of the ecological environment protection strength of China in recent years, the problem that the excavated waste soil is placed everywhere and the problem that the backfill soil source is tense exist. The problem can be solved by carrying out resource utilization on excavated earthwork, but the method for processing and utilizing over-wet soft soil still has some defects, the strength of the soft soil can be improved by the solidified soil technology, but the requirements of roadbed filling and compaction are still difficult to meet after the solidification processing under the condition that the water content of the soft soil is higher (40-60%), if the water content of the soft soil is reduced to be close to the optimal water content suitable for filling, natural air drying procedures such as piling and airing are often required, the time consumption is long, the efficiency is low, and the excavation earthwork needs to be repeatedly aired and is easily influenced by weather.
In addition, with the rapid development of the automobile industry in China, a large amount of waste tires need to be treated every year, the waste tires are called black pollution, and serious environmental problems and resource waste are caused when the waste tires are not treated properly. The soil modifier is used in roadbed filling, can improve the mechanical property of soil body, can solve the pollution problem, and has good social, economic and environmental benefits.
In summary, in order to treat the over-wet soft soil excavated in the construction engineering and then use the treated over-wet soft soil for roadbed filling, the invention of a preparation method for quickly recycling the over-wet soft soil into light filling soil is needed. The over-wet soft soil can quickly reduce water and improve compactibility in a short period, and simultaneously, the density of the soil body is reduced, so that the light filling soil with both strength and compactibility is formed.
Disclosure of Invention
The invention aims to provide a preparation method for quickly converting over-wet soft soil into light filling soil, which accelerates the curing process of the over-wet soft soil, improves the curing effect of the over-wet soft soil, can quickly convert excavated soft soil into the light filling soil with high strength and good compactibility for roadbed filling and realizes the resource utilization of the waste over-wet soft soil and waste tires.
In order to achieve the above object, the present invention provides the following technical solutions:
a preparation method for quickly resourcing over-wet soft soil into light filling soil comprises the following steps:
step 1) removing impurities in the over-wet soft soil excavated in the construction engineering, and transporting the over-wet soft soil to the side of a roadbed filling position.
And 2) preparing the waste tire rubber powder and the high-molecular water-absorbing resin into high-water-absorbing rubber particles with strength by a physical blending method, wherein the particle size of the particles is not more than 0.25 mm.
And 3) mixing the high water absorption rubber particles into the excavated over-wet soft soil, fully stirring, standing for 1-2 d (days), wherein the high water absorption rubber particles can quickly absorb pore water in the soil body and reduce the thickness of a combined water film, so that the compactibility of the soil body is improved.
And 4) paving the mixture soil body above the roadbed, adding a cementing material, and uniformly mixing to form the light filling soil.
And 5) rolling and compacting the light filling soil by using a compacting machine.
The light filling soil comprises the following raw materials in parts by mass: 75-85% of over-wet soft soil, 5-15% of waste tire rubber powder, 3-8% of high-molecular water-absorbing resin and 3-8% of cementing material, wherein the total amount is 100%.
The impurities are plant roots, organic matters and stones with the grain size larger than 5 cm.
Preferably, the over-wet soft soil is excavated soft soil with the water content of 40-60%, the waste tire rubber powder is powder particles obtained by crushing waste tires and removing steel wires, and the cementing material is at least one of an inorganic stabilizer and a geopolymer material.
Preferably, the excavated soft soil is silt, clay or silty clay, the inorganic stabilizer is cement or lime, and the geopolymer material is slag micro powder or fly ash.
Preferably, the particle size of the waste tire rubber powder is 0.125-0.25 mm (60-120 meshes).
Preferably, the polymer resin has a water absorption capacity of 500 to 2000 times and a particle diameter of not more than 50 μm.
Drawings
Fig. 1 is a preparation flow chart of the method for rapidly converting over-wet soft soil into light filling soil.
The specific implementation mode is as follows:
the invention is further described below with reference to the accompanying drawings and specific embodiments.
Example 1
In the embodiment, the over-wet soft soil is selected from Nanjing City of Jiangsu province, the water content is 45 wt.%, the liquid limit is 41%, the plastic limit is 17%, the plasticity index is 24, and the natural density is 1.91g/cm3Maximum dry density of 1.78g/cm3Optimum moisture content 15.5 wt.%. The waste tire rubber powder is purchased from Guangdong rubber industry (Nanjing) Co., Ltd, a high molecular water-absorbing treeLipid was purchased from Nanjing Saipu high molecular materials, Inc. The cementing material is conch brand 425 portland cement, purchased from Nanjing conch cement Co.
In the embodiment, the raw material proportion for quickly resourcing the over-wet soft soil into the light filling soil is as follows according to the mass proportion: 80% of over-wet soft soil, 10% of waste tire rubber powder, 5% of high molecular water-absorbing resin and 5% of cementing material, namely each light filling soil comprises: 1500kg of over-wet soft soil, 180kg of waste tire rubber powder, 90kg of high-molecular water-absorbent resin and 90kg of 425 cement.
Based on the preparation method for rapidly converting the over-wet soft soil into the light filling soil, the preparation process is shown in figure 1, and the steps are as follows:
step 1) removing plant roots and the like in the over-wet soft soil, and transporting the over-wet soft soil to the side of a roadbed filling position;
step 2) mixing the waste tire rubber powder and the high-molecular water-absorbing resin, putting the mixture into a mixing roll for mixing and molding, and then preparing high-water-absorbing rubber particles with the particle size of not more than 0.25mm in a rubber crusher;
step 3) uniformly stirring the high-water-absorption rubber particles and the over-wet soft soil in a fixed mixing plant (or a mobile road mixer) by using forced stirring equipment until the mixture is uniform in color and does not agglomerate, and then standing for 1d, wherein the high-water-absorption rubber particles can rapidly absorb pore water in a soil body and reduce the thickness of a combined water film, so that the compactibility of the soil body is improved;
step 4) paving the mixture soil body above the roadbed, doping cement into the mixture, fully stirring the mixture by using a stirring machine or a BMW machine, and standing for 2d to form light filling soil;
and 5) rolling and compacting the light filling soil by using a road roller, so that the purpose that the over-wet soft soil is solidified into high-strength light filling soil for roadbed filling after the moisture content is reduced and the compactibility is improved is realized.
Comparative example 1
The difference from example 1 is that the waste tire rubber powder and the water-absorbent polymer resin were not incorporated.
The performance of the over-wet soft soil fast resource filling prepared in the example and the comparative example 1 is compared, and the data is as follows:
28d unconfined compressive strength/kPa CBR/% after 28d curing Degree of compaction after milling% Dry density/g/cm after rolling3
Example 1 1047 28 94 1.43
Comparative example 1 639 11 85 1.56
It can be seen from the comparative data that the waste tire rubber powder and the high-molecular water-absorbent resin are not doped, the over-wet soft soil cannot be compacted to more than 90%, and therefore the over-wet soft soil cannot be applied to roadbed filling, after the waste tire rubber powder and the high-molecular water-absorbent resin are added, the high-molecular water-absorbent resin can absorb pore water, the thickness of a pore water combined water film between soil particles is reduced, the soil compactness is improved, the compactness can reach 94%, and the over-wet soft soil can be applied to roadbed filling. In addition, the high water absorption rubber particles formed by mixing the high polymer water absorption resin and the waste tire rubber particles have reduced water absorption capacity, but the rubber particles have higher strength, and the combination of the high polymer water absorption resin and the waste tire rubber particles can maintain higher overall strength, so that the strength after curing in example 1 is obviously higher than that in comparative example 1.
According to the preparation method for rapidly converting the over-wet soft soil into the light filling soil, the high water absorption rubber particles prepared from the high-molecular water absorption resin and the waste tire rubber powder are added into the over-wet soft soil with high water content, so that the water content of the over-wet soft soil can be rapidly reduced, and rapid precipitation and rapid construction can be realized. According to the invention, the high-molecular water-absorbing resin in the high-water-absorbing rubber particles absorbs pore water, and the rubber particles in the high-water-absorbing rubber particles have higher strength and durability than single high-molecular resin. After the cementing material is added, pore water in the soil is further consumed, the high-molecular water-absorbing resin can release a part of water, the soil particles and the high-water-absorbing rubber particles are connected and solidified by the cementing material, and the high-strength light filling soil with high compactness and small density is formed after rolling.
The above embodiments do not limit the technical solutions of the present invention in any way, and all technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (10)

1.一种将过湿软土快速资源化为轻质填筑土的制备方法，其特征在于，包括以下步骤：1. a preparation method that supermoist soft soil is quickly resourced into light filling soil, is characterized in that, comprises the following steps: 步骤1）将建设工程中的开挖过湿软土中的杂质清除，运输至路基填筑处旁；Step 1) Remove the impurities in the excavated wet soft soil in the construction project and transport it to the side of the roadbed filling; 步骤2）将废旧轮胎胶粉和高分子吸水树脂通过物理共混法制成具有强度的高吸水橡胶颗粒，颗粒粒径不大于0.25mm；Step 2) The waste tire rubber powder and the macromolecule water-absorbent resin are physically blended into high water-absorbent rubber particles with strength, and the particle size is not greater than 0.25mm; 步骤3）将高吸水橡胶颗粒掺入开挖过湿软土并充分拌和，静置1~2 天，高吸水橡胶颗粒迅速吸收土体中的孔隙水、减小结合水膜厚度，提高土体的可压实性，获得混合物土体；Step 3) Mix the superabsorbent rubber particles into the excavated wet soft soil and mix thoroughly, and let it stand for 1~2 days. The superabsorbent rubber particles quickly absorb the pore water in the soil, reduce the thickness of the bound water film, and improve the soil mass compactability to obtain a mixed soil mass; 步骤4）将上述混合物土体摊铺于路基上方，并掺入胶凝材料拌和均匀，形成轻质填筑土；Step 4) Spread the mixed soil above the roadbed, mix it with cementitious material and mix it evenly to form lightweight filling soil; 步骤5）利用压实机械对轻质填筑土进行碾压、压实。Step 5) Use compaction machinery to roll and compact the lightweight filling soil. 2.根据权利要求1所述的一种将过湿软土快速资源化为轻质填筑土的制备方法，其特征在于：所述轻质填筑土的原料配料质量比例如下：75~85%过湿软土、5~15%废旧轮胎胶粉、3~8%高分子吸水树脂、3~8%胶凝材料，总量合计为100%。2. a kind of preparation method that supermoistened soft soil is quickly resourced into light filling soil according to claim 1, it is characterized in that: the raw material batching mass ratio of described light filling soil is as follows: 75～85 % Super-moistened soft soil, 5~15% waste tire rubber powder, 3~8% polymer water absorbent resin, 3~8% cementitious material, the total amount is 100%. 3.根据权利要求2所述的一种将过湿软土快速资源化为轻质填筑土的制备方法，其特征在于：所述过湿软土为含水率40~60%的开挖软土。3. a kind of preparation method that super-moistened soft soil is quickly resourced into light filling soil according to claim 2, it is characterized in that: described super-moistened soft soil is excavation soft soil with moisture content of 40～60%. earth. 4.根据权利要求3所述的一种将过湿软土快速资源化为轻质填筑土的制备方法，其特征在于：所述开挖软土为粉土、粘土或粉质粘土。4 . The preparation method for rapidly recycling supermoistened soft soil into light filling soil according to claim 3 , wherein the excavated soft soil is silt, clay or silty clay. 5 . 5.根据权利要求2所述的一种将过湿软土快速资源化为轻质填筑土的制备方法，其特征在于：所述废旧轮胎胶粉为废旧轮胎粉碎后去除钢丝的粉状颗粒，粒径为0.125~0.25mm，60~120目。5. a kind of preparation method of quickly recycling supermoist soft soil into light filling soil according to claim 2, it is characterized in that: described waste tire rubber powder is the powdery particle that removes steel wire after waste tire pulverization , the particle size is 0.125~0.25mm, 60~120 mesh. 6.根据权利要求2所述的一种将过湿软土快速资源化为轻质填筑土的制备方法，其特征在于：所述高分子树脂吸水倍率为500~2000倍，粒径不大于50μm。6. a kind of preparation method of quickly reclaiming super-moistened soft soil into lightweight filling soil according to claim 2, is characterized in that: described macromolecular resin water absorption ratio is 500～2000 times, and particle diameter is not more than 500～2000 times. 50μm. 7.根据权利要求2所述的一种将过湿软土快速资源化为轻质填筑土的制备方法，其特征在于：所述胶凝材料为无机稳定剂、地聚物类材料中的至少一种。7. a kind of preparation method of quickly reusing supermoist soft soil into light filling soil according to claim 2, is characterized in that: described cementitious material is inorganic stabilizer, geopolymer material in the material. at least one. 8.根据权利要求7所述的一种将过湿软土快速资源化为轻质填筑土的制备方法，其特征在于：所述无机稳定剂为水泥或石灰。8 . The preparation method for rapidly recycling super-moistened soft soil into lightweight filling soil according to claim 7 , wherein the inorganic stabilizer is cement or lime. 9 . 9.根据权利要求7所述的一种将过湿软土快速资源化为轻质填筑土的制备方法，其特征在于：所述地聚物类材料为矿渣微粉或粉煤灰。9 . The preparation method for rapidly recycling super-moistened soft soil into lightweight filling soil according to claim 7 , wherein the geopolymer material is slag micropowder or fly ash. 10 . 10.根据权利要求1所述的一种将过湿软土快速资源化为轻质填筑土的制备方法，其特征在于：所述杂质为植物根系、有机质、粒径大于5cm的石块。10 . The preparation method for rapidly recycling supermoistened soft soil into lightweight filling soil according to claim 1 , wherein the impurities are plant roots, organic matter, and stones with a particle size greater than 5 cm. 11 .
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CN114351526A (en) * 2021-12-27 2022-04-15 湖南省西湖建筑集团有限公司 Soft soil roadbed structure system and construction method
CN115745515A (en) * 2022-11-23 2023-03-07 安徽理工大学 Preparation method of waste rubber cement soil

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彭以舟: "工业废渣复合固化盐渍疏浚淤泥机理及强度研究", 《浙江交通职业技术学院学报》 *
程福周等: "高含水率疏浚淤泥固化的力学性质试验研究", 《科学技术与工程》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114351526A (en) * 2021-12-27 2022-04-15 湖南省西湖建筑集团有限公司 Soft soil roadbed structure system and construction method
CN115745515A (en) * 2022-11-23 2023-03-07 安徽理工大学 Preparation method of waste rubber cement soil
CN115745515B (en) * 2022-11-23 2023-09-12 安徽理工大学 Preparation method of waste rubber cement soil

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