CN111454029A - Cement stabilizing material and preparation method thereof - Google Patents
Cement stabilizing material and preparation method thereof Download PDFInfo
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- CN111454029A CN111454029A CN202010282234.5A CN202010282234A CN111454029A CN 111454029 A CN111454029 A CN 111454029A CN 202010282234 A CN202010282234 A CN 202010282234A CN 111454029 A CN111454029 A CN 111454029A
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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
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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
- 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
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
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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
- 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
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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
- 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
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a cement stabilizing material and a preparation method thereof. The cement stabilizing material comprises the following components in parts by weight: soil particles: 317 and 425 parts; cement: 37-45 parts; aggregate: 91-107 parts; fiber addition material: 46-76; water: 129 parts. The preparation method of the cement stabilizing material comprises the following steps: s1, paving the excavated earthwork on the ground for airing until the earthwork is dry; s2, crushing the agglomerated soil in the dried earthwork; s3, vibrating and screening earthwork, and dividing the earthwork into particles with the particle size not less than 2mm and powder with the particle size less than 2 mm; taking the particles as soil particles; s4, uniformly mixing the soil particles, the cement, the aggregate and the fiber additive in corresponding parts by weight to obtain a dry mixture; and adding water in corresponding parts by weight into the dry mixture, and uniformly mixing to obtain the cement stabilizing material. The invention has the advantages of low cost, high strength and the like.
Description
Technical Field
The invention relates to the field of asphalt road construction materials, in particular to a cement stabilizing material and a preparation method thereof.
Background
In the road construction process, a base layer is required to be arranged to improve the stability of the pavement in use. However, the road area coverage is too large, and the cost is huge if the concrete is directly adopted for laying. In order to reduce construction costs, cement-stabilized materials are generally used as the base layer paving material for roads. The cement stabilizing material is a mixture obtained by adding a proper amount of cement and water into loose soil, gravel or other aggregates and uniformly mixing.
Chinese patent application publication No. CN 108101450 a discloses a cement stabilized base material and a design method thereof, which comprises the following components by weight: 31.5 to 58.4 percent of coal gangue fine material, 31.5 to 58.6 percent of limestone aggregate, 4.1 to 5.4 percent of cement and the balance of water. The design method comprises the following steps: 1) carrying out chemical and physical mechanical tests on the coal gangue sample to eliminate the risk of harmful impurities; 2) under the principle of maximally utilizing the coal gangue fine materials, limestone aggregate is doped for grading composition design; 3) selecting a plurality of cement doses to carry out compaction tests; 4) determining the dosage of the cement according to the unconfined compressive strength of 7 d; 5) and (5) verifying the material composition scheme through the splitting strength test, and returning to the step 2) if the material composition scheme is not met.
However, the cost of the above solution is still relatively high, and it is necessary to provide a cement-stabilizing material which can reduce the cost of the material itself to a greater extent.
Disclosure of Invention
In view of the disadvantages of the prior art, a first object of the present invention is to provide a cement stabilizing material having an advantage of reducing construction costs.
In order to achieve the first object, the invention provides the following technical scheme:
a cement stabilizing material comprises the following components in parts by weight:
soil particles: 317 and 425 parts;
cement: 37-45 parts;
aggregate: 91-107 parts;
fiber addition material: 46-76;
water: 129 parts.
By adopting the technical scheme, the fiber additive is matched with the aggregate, so that the cohesiveness of the cement stabilizing material is improved, and the integral strength of the cement stabilizing material after solidification is enhanced. Meanwhile, the workability of the cement stabilizing material is improved, so that the construction difficulty is reduced.
Further: the aggregate comprises 91-107 parts of broken stone and 46-59 parts of waste incineration slag by weight, and the particle size of the waste incineration slag is not more than 1 cm.
By adopting the technical scheme, the refuse incineration slag contains components such as metal oxides, hydroxides and the like, and can replace cement, so that the production cost is reduced. Simultaneously, because waste incineration slag is the particulate matter, use with the rubble cooperation can improve the intensive nature that the inside particulate matter of cement stabilized material distributes to guarantee cement stabilized material's whole cohesiveness and intensity.
Further: the particle size of the crushed stone is 5mm-15mm, and the crushed stone is uniformly graded.
Through adopting above-mentioned technical scheme, improve the gradation homogeneity of the inside particulate matter of cement stable material to improve the bulk strength.
Further: the fiber additive comprises straw and crushed fabric, and the area of the single piece of crushed fabric is not more than 5cm2。
Through adopting above-mentioned technical scheme, broken fabric and straw cooperation are used, and broken fabric can cohere more cement, soil particles and waste incineration slay to improve holistic cohesiveness. And when the broken fabric is wrapped outside the straws, the fusion property of the straws in the cement stabilizing material can be improved, so that the integrity of all components in the cement stabilizing material is improved. The main component in the straw is fiber, so that the structural strength of the cement stabilizing material can be improved, and meanwhile, the cost is very low and the material taking is simple. In addition, the water solution of the straw is alkaline, so that the carbonization process of cement after hydration and solidification can be prolonged, and the service life of the cement stabilizing material is prolonged.
Further: the weight portion of the straw is 26-41 parts, and the weight portion of the broken fabric is 20-35 parts.
By adopting the technical scheme, experiments show that the matching property between the straws and the broken fabric can be improved in parts by weight, so that the structural strength and the workability of the cement stabilizing material are optimal.
Further: the length of the straw is 20mm-60 mm.
Through adopting above-mentioned technical scheme, when the straw is short excessively, can't provide fine intensity for cement stabilized material and support, also can't cohere sufficient cement, soil particle and waste incineration slay, can reduce cement stabilized material's overall structure intensity on the contrary. When the straws are too long, the mixing process of the cement stabilizing materials can be interfered, and the broken fabrics are difficult to wrap the outer surfaces of the straws, so that the materials in the cement stabilizing materials are unevenly distributed, and the cohesive force among the materials is reduced.
The second purpose of the invention is to provide a preparation method of the cement stabilizing material.
In order to achieve the second object, the invention provides the following technical scheme:
a method of preparing a cement stabilising material comprising the steps of:
s1, paving the excavated earthwork on the ground for airing until the earthwork is dry;
s2, crushing the agglomerated soil in the dried earthwork;
s3, vibrating and screening earthwork, and dividing the earthwork into particles with the particle size not less than 2mm and powder with the particle size less than 2 mm; taking the particles as soil particles;
s4, uniformly mixing the soil particles, the cement, the aggregate and the fiber additive in corresponding parts by weight to obtain a dry mixture; and adding water in corresponding parts by weight into the dry mixture, and uniformly mixing to obtain the cement stabilizing material.
Through adopting above-mentioned technical scheme, get rid of the moisture in the earthwork through the sunning to make soil become soft, the hole appears in the soil inside of part caking, the crushing in the later stage of being convenient for. The mud particles in the soil are small and mud can reduce the overall strength of the cement stabilising material. After the agglomerated soil is crushed, the mud in the soil particles can be better removed in the vibrating and screening process, so that the overall strength of the cement stabilizing material is improved. The soil particles with the particle size larger than 2mm can replace cement and can also be used as aggregate, the structural strength of the cement stabilizing material can be guaranteed, and the cost can be reduced.
Further: in S1, turning the earthwork by using a turning machine, wherein the turning machine is of a rubber wheel type; at S2, the agglomerated soil is crushed by rolling the earthwork with a rubber wheel of the turner.
Through adopting above-mentioned technical scheme, the rubber wheel is elastic material, can not cause the injury to the particulate matter in the soil, but can crush the soil of the caking that has the hole to be convenient for the sieve that shakes in later stage. One turner can carry out the operation of two processes, and efficiency is improved when cost is reduced. In the actual operation process, if there is sharp-pointed stone in the soil, can reject in advance, avoid causing the injury to the rubber wheel.
Further: in S4, the straw is first beaten to break the straw lengthwise and make the straw soft.
By adopting the technical scheme, the fibers of the straws are peeled off to a certain extent, so that the broken fabrics and the straws are wrapped better, the aggregation of cement, soil particles and the like is facilitated, and the integrity and the structural strength of the cement stabilizing materials are improved.
In conclusion, the invention has the following beneficial effects:
1. by adding the soil particles and the limiting addition material, the cost is reduced, and the overall strength of the cement stabilizing material is improved; the cement consumption of the invention is reduced under the condition of cement stabilizing materials with the same strength;
2. the method has the advantages that wastes such as straws, broken fabrics and waste incineration slag are reused, so that the cost is reduced, the environmental pollution is reduced, the structural strength of the cement stabilizing material can be improved, and the three aims are achieved.
Drawings
FIG. 1 is a process flow diagram of example 1.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples.
Examples
Example 1: referring to fig. 1, a cement stabilizing material, comprising the components and corresponding parts by weight shown in table 1, was prepared by the following steps:
and S1, paving the excavated earthwork on the ground for airing, and turning and throwing the earthwork by using a turning and throwing machine in the airing process until the earthwork is dry. The turner is made of rubber wheels.
S2, rolling earthwork by using a rubber wheel of the turner, and crushing agglomerated soil;
s3, vibrating and screening the earthwork to divide the earthwork into particles with the particle size not less than 2mm and powder with the particle size less than 2 mm. The aforementioned particulate matter was used as soil particles.
S4, hammering the straw to break the straw along the length direction and make the straw soft. And uniformly mixing the soil particles, the cement and the waste incineration slag in corresponding parts by weight to obtain a first dry-mixed material. And adding the crushed stone in the corresponding weight part into the first dry-mixed material, and uniformly mixing to obtain a second dry-mixed material. And (3) adding the straws and the crushed fabrics in corresponding parts by weight into water in corresponding parts by weight, and uniformly mixing to obtain a wet-mixed material. And adding the wet mixture into the second dry mixture, and uniformly mixing to obtain the cement stabilizing material.
Wherein, the cement is 42.5 ordinary Portland cement. The length of the straw is 45 mm. The area of the single piece of broken fabric is 2cm2-5cm2. The particle size of the refuse incineration slag is not more than 1cm, and 5mm-15mm uniform gradation is selected as the broken stone.
Examples 2 to 8: a cement stabilizing material is different from the cement stabilizing material in example 1 only in that the weight parts of partial components are different, and specific components and corresponding weight parts are shown in Table 1.
TABLE 1 Components of examples 1-8 and corresponding parts by weight tables
Example 9: a cement stabilising material differing from that of example 1 only in that the straw is 10mm in length and the area of broken fabricGreater than 5cm2。
Example 10: a cement stabilising material differing from that of example 1 only in that the straw is 10mm in length and the area of broken fabric is greater than 5cm2。
Example 11: a cement stabilising material differing from example 1 only in that the straw is not beaten during the preparation of the cement stabilising material.
Comparative example
Comparative examples 1 to 5: a cement stabilizing material is different from the cement stabilizing material in example 1 only in that the weight parts of partial components are different, and specific components and corresponding weight parts are shown in Table 2.
TABLE 2 Components of comparative examples 1-5 and corresponding tables of parts by weight
Comparative example 6: a cement stabilising material which differs from that of example 1 only in that the earth is not subjected to a vibrating screen during the preparation of the cement stabilising material.
Comparative example 7: a cement stabilising material differing from example 1 only in that the agglomerated soil is not crushed.
Performance testing experiment one: strength test
Test samples: examples 1 to 11 were selected as test samples 1 to 11, and comparative examples 1 to 7 were selected as control samples 1 to 7.
The test method comprises the following steps: each set of test and control samples was made in three volumes of 100cm3The standard test piece of (1). And after standard maintenance is carried out on the standard test piece for 6 days, the standard test piece is soaked in water for 24 hours and is taken out to carry out an unconfined compressive strength test.
And (3) test results: the compressive strength is shown in table 3.
TABLE 3 compressive Strength (MPa) of test samples 1-11 and control samples 1-7
| Numbering | Compressive strength | Numbering | Compressive strength |
| Example 1 | 6.3 | Example 10 | 5.7 |
| Example 2 | 6.9 | Example 11 | 6 |
| Example 3 | 5.7 | Comparative example 1 | 5.6 |
| Example 4 | 5.8 | Comparative example 2 | 5.3 |
| Example 5 | 6.5 | Comparative example 3 | 5.3 |
| Example 6 | 5.9 | Comparative example 4 | 5.3 |
| Example 7 | 5.6 | Comparative example 5 | 5.1 |
| Example 8 | 5.7 | Comparative example 6 | 4.9 |
| Example 9 | 5.4 | Comparative example 7 | 4.9 |
Comparison of examples 1 to 3 shows that although the strength of the cement-stabilizing material is increased by increasing the cement content, the cost of cement is high, and the present invention aims to reduce the amount of cement to be used, so that the use of excessive cement is not preferable. In addition, the use of too much cement results in the need for more water, and the curing process is prolonged and not easy to perform with the construction. Moreover, the strength achieved by the composition of example 1 fully meets the use requirements of the highway base course.
As is clear from comparison of examples 1, 4-6 and comparative examples 1-2, the combination of crushed stone of uniform gradation and refuse-incinerated slag can improve the overall structural strength of the cement-stabilized material. When the contents of broken stone and refuse incineration slag are high, although the strength is high, microscopic cracks visible to the naked eye exist on the surface of a test piece, and the use in the later period is not facilitated.
As can be seen by comparing examples 1, 7-8 and comparative examples 3-5, the use of both straw and crushed fabric can increase the overall compressive strength of the cement stabilization material. When too much straw is used and the broken fabric is less or too little straw is used and the broken fabric is too much, the copolymerization unit formed by the straw and the broken fabric and the particles is reduced, and the overall compressive strength of the cement stabilizing material is reduced. When the straw length is too short and the area of broken fabric is great, the broken fabric can carry out comprehensive parcel and winding to the straw for particulate matters such as cement are difficult to permeate from broken fabric, lead to inside a plurality of holes that appear of cement stabilized material, make cement stabilized material's compressive strength reduce. And when the straw is too long and the area of the broken fabric is too small, the broken fabric cannot form stable copolymer with the straw.
Example 1, example 11 and comparison 6-7 show that the compressive strength of the cement stabilizing material is reduced without beating the straw, because the internal fiber of the straw is integrally formed, so that the straw is too rigid, and the straw cannot be well mixed and matched with other materials.
The lack of a vibrating screen arc for the soil results in the complete mixing of the mud present in the soil into the cement stabilizing material, thereby reducing the compressive strength of the cement stabilizing material. Non-breaking up the agglomerated soil can result in the agglomerated mud remaining in the shaker as soil particles, which is detrimental to the strength of the cement stabilizing material.
Experiment two: workability test
Test samples: example 1, example 3, example 5 and example 7 were selected as test samples 1 to 4, and comparative example 2 and comparative example 4 were selected as control samples 1 to 2.
The test method comprises the following steps: the test was performed using a slump cone, and slump of the test sample and the control sample was measured. The slump is preferably 6cm to 8 cm.
And (3) test results: slump is shown in table 4.
TABLE 4 slump (cm) of test samples 1-4 and control samples 1-2
| Numbering | Slump constant | Numbering | Slump constant |
| Example 1 | 6.5 | Example 7 | 8.5 |
| Example 3 | 9 | Comparative example 2 | 4 |
| Example 5 | 5.2 | Comparative example 4 | 9 |
Comparing example 1 with example 3, it is understood that the dispersibility of the soil particles is good, and when the cement content is small and the soil particle content is large, the fluidity of the cement stabilizing material becomes good and the slump corresponding thereto becomes large.
Example 1, example 5, comparative example 2 and comparative example 4 it can be seen that the addition of refuse-incinerated slag can reduce the fluidity of the cement stabilizing material, thereby allowing the cement stabilizing material to have good workability. However, when the content of the refuse-incinerated slag is too large, the cohesion of the cement-stabilizing material is too good, and the laying of the base layer is not facilitated.
Example 1 and example 7 compare and show that when the straw and crushed fabric content is too low, the fluidity of the cement stabilizing material is too good, which is not favorable for curing the base layer.
In conclusion, the addition of the waste incineration slag can reduce the using amount of cement, ensure the compressive strength of the cement stabilizing material and reduce the production cost. And the straw and the broken fabric are used simultaneously, so that the effect of improving the overall compressive strength of the cement stabilizing material can be achieved, and the acidity caused by waste incineration slag can be neutralized by adding the straw, so that the service life of the cement stabilizing material is prolonged.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. The cement stabilizing material is characterized by comprising the following components in parts by weight:
soil particles: 317 and 425 parts;
cement: 37-45 parts;
aggregate: 91-107 parts;
fiber addition material: 46-76;
water: 129 parts.
2. The cement stabilizing material as claimed in claim 1, wherein the aggregate comprises 91 to 107 parts by weight of crushed stone and 46 to 59 parts by weight of refuse-incinerated slag, and the particle size of the refuse-incinerated slag is not more than 1 cm.
3. A cement stabilising material according to claim 2, wherein the crushed stone has a uniform gradation of particle size in the range 5mm to 15 mm.
4. The cement stabilizing material as claimed in claim 1, wherein the fiber additive comprises straw and crushed fabric, and the area of the crushed fabric is not more than 5cm2。
5. The cement stabilizing material as claimed in claim 4, wherein the straw is 26-41 parts by weight and the crushed fabric is 20-35 parts by weight.
6. A cement stabilising material according to claim 4, wherein the straw is 20mm to 60mm in length.
7. A method of preparing a cement stabilising material as claimed in any one of claims 1 to 6, comprising the steps of:
s1, paving the excavated earthwork on the ground for airing until the earthwork is dry;
s2, crushing the agglomerated soil in the dried earthwork;
s3, vibrating and screening earthwork, and dividing the earthwork into particles with the particle size not less than 2mm and powder with the particle size less than 2 mm; taking the particles as soil particles;
s4, uniformly mixing the soil particles, the cement, the aggregate and the fiber additive in corresponding parts by weight to obtain a dry mixture; and adding water in corresponding parts by weight into the dry mixture, and uniformly mixing to obtain the cement stabilizing material.
8. The method for preparing a cement stabilizing material as claimed in claim 7, wherein in S1, the earth is turned by using a turning machine, the turning machine being of a rubber wheel type; at S2, the agglomerated soil is crushed by rolling the earthwork with a rubber wheel of the turner.
9. The method of claim 7, wherein the stalks are hammered to break the stalks in a length direction and to make the stalks flexible at S4.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102633485A (en) * | 2012-04-09 | 2012-08-15 | 蒋黔湘 | Method of using plain soil to produce hydraulic engineering seepage-proofing brick in situ |
| CN108129103A (en) * | 2018-01-11 | 2018-06-08 | 太原理工大学 | A kind of paste filling material for strengthening stability using agronomic crop fibre and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102633485A (en) * | 2012-04-09 | 2012-08-15 | 蒋黔湘 | Method of using plain soil to produce hydraulic engineering seepage-proofing brick in situ |
| CN108129103A (en) * | 2018-01-11 | 2018-06-08 | 太原理工大学 | A kind of paste filling material for strengthening stability using agronomic crop fibre and preparation method thereof |
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Address after: 6 / F, 126 Wenjiao Road, Fuchun street, Fuyang District, Hangzhou, Zhejiang 311400 Applicant after: Huazi Pentium Construction Engineering Group Co.,Ltd. Address before: 6 / F, 126 Wenjiao Road, Fuchun street, Fuyang District, Hangzhou, Zhejiang 311400 Applicant before: Zhejiang Pentium Municipal Garden Construction Engineering Co.,Ltd. |
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