CN110342868B - Semi-flexible powdery soil road material and preparation method thereof - Google Patents
Semi-flexible powdery soil road material and preparation method thereof Download PDFInfo
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- CN110342868B CN110342868B CN201910529880.4A CN201910529880A CN110342868B CN 110342868 B CN110342868 B CN 110342868B CN 201910529880 A CN201910529880 A CN 201910529880A CN 110342868 B CN110342868 B CN 110342868B
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- flexible
- silty soil
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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
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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
Abstract
The invention discloses a semi-flexible silty soil road material and a preparation method thereof, belonging to the field of road engineering. The road material is prepared by mixing silty soil, a flexible curing agent and an active excitant according to a certain proportion, and then mixing, compacting and curing. Compared with the prior art, the semi-flexible silty soil road material has the advantages of micro-damage self-healing, good road performance, low cost, local material utilization and the like, is suitable for application fields of road beds of various grades, low-grade and rural highway base layers and subbase layers, poor foundation replacement and filling, construction sidewalks and the like, and has good popularization and application values.
Description
Technical Field
The invention relates to the field of road engineering, and particularly provides a semi-flexible silty soil road material and a preparation method thereof.
Background
A large amount of natural building materials such as soil, stone and the like are required to be consumed in the road engineering construction process, and relevant technical requirements are provided for the physical, water and mechanical properties of the soil and stone materials. At present, with the high-speed increase of the engineering construction speed and quantity in China, high-quality soil and stone materials which can directly meet the road performance are in a very short supply, and the ecological environment can be further damaged by excessive mining. How to use local materials and fully develop and utilize novel road materials has generally received social attention.
The silty soil is widely distributed in the middle and downstream alluvial regions of main rivers such as yellow river, Huaihe river and the like, and has the characteristics of low content of sticky grains, poor grain composition, high permeability, remarkable water sensitivity and the like. If the concrete is directly used for road subgrade filling, under the influence of factors such as natural precipitation and capillary water rise, the strength is seriously attenuated, the durability is insufficient, and serious diseases such as settlement deformation, slurry turning, collapse, freeze thawing, longitudinal cracking and the like occur. Therefore, the silty soil is a natural material with poor engineering properties and cannot be directly applied to road engineering.
The applicant disclosed in patent document No. CN107285694A a method for solidifying silty soil by compounding emulsified asphalt. The method takes the emulsified asphalt, the cement and the silty soil as raw materials, can realize an available pavement material, and still has a larger space for improving the processing technology, the production cost, the strength of the prepared pavement material, the water stability, the freezing resistance and other properties.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a semi-flexible powdery soil road material with good physical, mechanical, road and durability properties.
The invention further aims to provide a preparation method of the semi-flexible powdery soil road material.
The technical scheme adopted by the invention for solving the technical problems is as follows: a semi-flexible silty soil road material is prepared from the following silty soil, a flexible curing agent and an activity excitant in parts by weight:
86-92 parts of silty soil;
6-9 parts of a flexible curing agent;
2-5 parts of an active excitant,
the flexible curing agent is red mud asphalt powder.
The preferable weight ratio of the raw materials is as follows:
88-90 parts of silty soil;
7-8 parts of a flexible curing agent;
3-4 parts of an activity excitant.
In the silty soil, the weight percentage content of particles with the particle size of less than 0.075mm is more than 50%, the weight percentage content of organic matters is less than 10%, the liquid limit is less than 50%, and the plasticity index is less than 17.
The red mud asphalt powder can be a mixture of asphalt powder and red mud powder, and is preferably prepared by heating, uniformly stirring, cooling and grinding asphalt and red mud. The fineness of the ground red mud asphalt powder is less than 120 meshes, and the water content is less than 3%.
The red mud is used as a flexible curing agent carrier, changes the existing state of the asphalt at normal temperature, forms a larger specific surface area, and is added with alkalinity to improve the adhesion between the asphalt and the silty soil. The asphalt is dispersed among the silty soil particles in a solid fine powder state, and is softened and continuously filled in material pores and microcracks when the temperature rises, so that the compressive strength and the shear strength of the material are improved, the whole material has semi-flexible characteristics, and self-healing reinforcement is realized on micro-damage.
The mass ratio of the asphalt to the red mud is preferably 1: 1.9-2.7, and particularly, the technical effect is best when the mass ratio of the asphalt to the red mud is 1: 2.1-2.5.
The asphalt is preferably No. 70 or No. 90 asphalt;
the red mud is preferably sintering process red mud or Bayer process red mud.
The active exciting agent is formed by mixing calcium hydroxide and volcanic ash or pumice powder, the mass ratio of the calcium hydroxide to the volcanic ash or the pumice powder is 65-75: 25-35, the active exciting agent is preferably a mixture of the calcium hydroxide and the volcanic ash, and the mass ratio of the calcium hydroxide to the volcanic ash is 68-72: 28-32.
The volcanic ash or pumice powder contains active silicon dioxide, aluminum oxide and other components, and is mixed with calcium hydroxide to react under excitation to form a hydrated cementitious product, so that the material has early hardening strength.
And as time increases, the activator hydration product and the flexible curing agent organic gelling component are continuously fused and wrapped with the silty soil particles to form a three-dimensional agglomerated structure, so that the high-performance road filling material is formed.
The semi-flexible powdery soil road material is obtained by mixing, stirring, compacting, forming and curing the raw materials, but in order to ensure that the performance of the obtained road material reaches the best, the preparation method preferably comprises the following steps:
(1) uniformly mixing the red mud and asphalt at 140-160 ℃, cooling the mixture, and grinding the mixture until the fineness is less than 120 meshes to prepare a flexible curing agent for later use;
(2) stirring calcium hydroxide and volcanic ash or pumice powder at a constant speed, wherein the rotating speed of a stirring blade is more than 120r/min, and the stirring time is not less than 60s, so as to prepare an active excitant for later use;
(3) according to the optimal water content parameter of the silty soil obtained by the heavy compaction test, adjusting the water content of the silty soil to be within + 0.5-1% of the optimal water content parameter;
(4) uniformly mixing the silty soil, the flexible curing agent and the activity activator in the steps (1) to (3) in proportion, compacting to a degree of compaction greater than 0.94, maintaining moisture for 48 to 72 hours to prepare the semi-flexible silty soil road material,
the weight ratio of the silty soil, the flexible curing agent and the activity excitant is as follows:
86-92 parts of silty soil;
6-9 parts of a flexible curing agent;
2-5 parts of an activity excitant.
Compared with the prior art, the semi-flexible powdery soil road material and the preparation method thereof have the following outstanding beneficial effects:
the cohesive force c of the semi-flexible silty soil road material is more than 120kPa, and the internal friction angle is
The strength is more than 30 degrees, the strength is more than 2.0MPa, the dynamic elastic modulus is 7000-9000 MPa, the softening coefficient is more than 0.85, the strength is more than 2.6MPa after the strength is increased by cyclic heating at 55-60 ℃ for 10 times, the application performance index is good, the material can replace the traditional soil and stone filling materials in a large scale, and the popularization and application value and the development prospect are high;
the method has the advantages that (1) poor engineering characteristics of low cohesive grain content, poor grain grading, high permeability, obvious water sensitivity and the like of the silty soil are effectively overcome, the microstructure of the silty soil is improved through asphalt pulverization, flexible solidification and activity excitation technologies, the physical, mechanical, road and durability performances are obviously improved, the working performance is superior to that of the traditional soil and stone materials, cement, lime and lime, the fine-grained soil is improved, the problem that road building materials in silty soil distribution areas are in short supply is solved, industrial waste materials are effectively recycled, and the method is beneficial to the coordinated sustainable development of economy, society, resources and environmental protection;
the compression resistance and the shearing resistance are improved, the effect of the cyclic load bearing is improved, and the water stability and the freezing resistance of the material are good; the strength can be continuously increased under the condition of simulating the repeated heating of the road in summer, and in addition, the self-healing reinforcement can be realized due to the early-stage micro-damage;
and (IV) the preparation process is simple, the process parameters are easy to control, the industrial waste materials are effectively utilized, the silty soil is obtained from local resources, the resources are saved, and the construction cost is reduced.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
Unless otherwise specified, the contents of the respective components used below are weight percent contents.
[ examples ] A method for producing a compound
The preparation method comprises the following steps:
(1) heating the asphalt to 155 +/-2 ℃, keeping the temperature condition, adding the red mud according to the proportion, and fully and uniformly stirring. Cooling the mixture to room temperature, and grinding the mixture to the fineness of 200 meshes to prepare a flexible curing agent for later use;
(2) uniformly stirring calcium hydroxide and volcanic ash in proportion, wherein the rotating speed of a stirring blade is 150r/min, and the stirring time is 60s, so as to prepare a flexible curing agent for later use;
(3) according to the optimal water content parameter of the silty soil (the optimal water content of the silty soil used in the embodiment is 9.2%) obtained by the heavy compaction test, the water content of the silty soil is adjusted to 9.8%.
(4) And (3) uniformly mixing the silty soil, the flexible curing agent and the activity activator in the steps (1) to (3) in proportion, compacting to 0.94 degree, and maintaining for 72 hours to obtain the semi-flexible silty soil road material.
Wherein the weight ratio of each raw material is shown in the following table:
[ COMPARATIVE EXAMPLES ]
Comparative example the preparation method was the same as in example.
Wherein the weight proportions of the raw materials are shown in the following table:
[ Property measurement ]
According to the national and industrial standards, the semi-flexible silty soil road material obtained in the examples and the comparative examples is tested for indexes of shear strength, compression strength, dynamic elastic modulus, 55 ℃ heating cycle strength and softening coefficient, and the test results are shown in the following table:
the invention fully utilizes the mutual excitation and function complementary effect among the materials of the industrial solid waste residue red mud, the asphalt, the volcanic ash, the pumice powder and the like, and combines with the silty soil to form a novel road filling material with semi-flexibility and self-healing capability.
The above-described embodiment is only one of the preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (7)
1. The semi-flexible silty soil road material is characterized by being prepared from the following silty soil, a flexible curing agent and an activity excitant in parts by weight:
86-92 parts of silty soil;
6-9 parts of a flexible curing agent;
2-5 parts of an active excitant,
the flexible curing agent is red mud asphalt powder, and the red mud asphalt powder is prepared by heating, stirring uniformly, cooling and grinding asphalt and red mud;
the active excitant is formed by mixing calcium hydroxide and volcanic ash or pumice powder.
2. The semi-flexible silty soil road material of claim 1, wherein the weight ratio of each raw material is:
88-90 parts of silty soil;
7-8 parts of a flexible curing agent;
3-4 parts of an activity excitant.
3. The semi-flexible silty soil road material of claim 1 or 2, wherein: the mass ratio of the asphalt to the red mud is 1: 1.9-2.7.
4. The semi-flexible silty soil road material of claim 1 or 2, wherein:
the asphalt is No. 70 or No. 90 asphalt;
the red mud is sintering process red mud or Bayer process red mud.
5. The semi-flexible silty soil road material of claim 1 or 2, wherein: the mass ratio of the calcium hydroxide to the volcanic ash or the pumice powder is 65-75: 25-35.
6. The preparation method of the semi-flexible silty soil road material is characterized by comprising the following steps:
(1) uniformly mixing the red mud and asphalt at 140-160 ℃, cooling the mixture, and grinding the mixture until the fineness is less than 120 meshes to prepare a flexible curing agent for later use;
(2) stirring calcium hydroxide and volcanic ash or pumice powder at a constant speed, wherein the rotating speed of a stirring blade is more than 120r/min, and the stirring time is not less than 60s, so as to prepare an active excitant for later use;
(3) according to the optimal water content parameter of the silty soil obtained by the heavy compaction test, adjusting the water content of the silty soil to be within + 0.5-1% of the optimal water content parameter;
(4) uniformly mixing the silty soil, the flexible curing agent and the activity activator in the steps (1) to (3) in proportion, compacting to a degree of compaction greater than 0.94, maintaining moisture for 48 to 72 hours to prepare the semi-flexible silty soil road material,
the weight ratio of the silty soil, the flexible curing agent and the activity excitant is as follows:
86-92 parts of silty soil;
6-9 parts of a flexible curing agent;
2-5 parts of an activity excitant.
7. The method for preparing the semi-flexible silty soil road material according to claim 6, wherein:
the mass ratio of the asphalt to the red mud in the flexible curing agent is 1: 1.9-2.7;
the mass ratio of the calcium hydroxide to the volcanic ash or the pumice powder in the active excitant is 65-75: 25-35.
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| CN201910529880.4A CN110342868B (en) | 2019-06-19 | 2019-06-19 | Semi-flexible powdery soil road material and preparation method thereof |
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| CN110342868B true CN110342868B (en) | 2021-08-06 |
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| WO2007023570A1 (en) * | 2005-08-24 | 2007-03-01 | Jfe Steel Corporation | Water retaining material composition for paving and method for applying water retaining paving |
| CN103224370B (en) * | 2013-03-11 | 2016-01-27 | 中城建第五工程局集团有限公司 | Soil-solidified-agent and preparation and application thereof |
| CN105753375A (en) * | 2016-02-29 | 2016-07-13 | 河南城建学院 | Asphalt mixture taking red mud as filler and preparation method thereof |
| CN107033612A (en) * | 2017-04-13 | 2017-08-11 | 桂林理工大学 | A kind of preparation method of red mud modified pitch |
| CN107285694B (en) * | 2017-05-23 | 2019-08-27 | 山东省交通科学研究院 | A method of utilizing emulsified asphalt composite curing slity soil |
| CN107722649A (en) * | 2017-09-18 | 2018-02-23 | 同济大学 | A kind of modified pitch and its preparation and application |
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