CN107512891B - Pavement base material - Google Patents

Pavement base material Download PDF

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Publication number
CN107512891B
CN107512891B CN201710803719.2A CN201710803719A CN107512891B CN 107512891 B CN107512891 B CN 107512891B CN 201710803719 A CN201710803719 A CN 201710803719A CN 107512891 B CN107512891 B CN 107512891B
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Prior art keywords
red clay
parts
curing agent
base material
mass
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CN107512891A (en
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杨兴之
周纯
赖正林
谢先浩
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Guizhou Architectural Design & Research Institute Co ltd
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Guizhou Architectural Design & Research Institute Co ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00Foundations for pavings
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0075Uses not provided for elsewhere in C04B2111/00 for road construction

Abstract

The invention discloses a pavement base material which is prepared from the following raw materials in parts by mass: 20-40 parts of solidified red clay and 60-80 parts of macadam; the solidified red clay is prepared by mixing the red clay curing agent in the red clay according to the mass part, and the curing agent amount of the mixed red clay accounts for 7-12% of the mass of the mixture of the red clay and the red clay curing agent. The novel pavement base material prepared by compounding the red clay which is cured and improved by the red clay curing agent and the graded broken stones has good pavement performance and low material cost, and obtains good technical and economic effects.

Description

Pavement base material
Technical Field
The invention relates to a pavement base material, and belongs to the technical field of engineering building material application.
Background
The red clay is special soil in geotechnical engineering, belongs to carbonate rocks such as limestone and dolomite, is high-plasticity red clay formed by weathering in subtropical high-temperature humid climates, and has the engineering characteristics of high dispersibility, high water content, high plasticity, high colloid component content and the like. The Guizhou province is a main distribution area of red clay in China, and under the influence of wet heat exchange climate, the red clay can be dried and condensed to form cracks, and is mostly in a vertically-opened cracking shape on the ground surface and gradually closed downwards to form a net-shaped crack surface, so that the integrity of a soil body is damaged, and in rainy seasons, the natural water content of the red clay is often larger than a plastic limit and even close to a liquid limit, so that the strength of the soil body is sharply reduced; however, with the rapid development of road construction in Guizhou in recent years, construction work is often performed on the basis of red clay foundations, but a road subgrade needs to be constructed on the red clay foundations due to the influence of the characteristics of the red clay, and in order to solve the above problems, the applicant designs a new road base material capable of effectively utilizing the red clay.
Disclosure of Invention
The invention aims to solve the technical problem of providing a pavement base material which is low in cost and good in performance and is prepared by compounding cured and improved red clay and graded broken stones, and overcoming the defects of the prior art.
The technical scheme of the invention is as follows: the pavement base material is composed of the following raw materials in parts by mass: 20-40 parts of solidified red clay and 60-80 parts of macadam; the solidified red clay is prepared by mixing the red clay curing agent in the red clay according to the mass part, and the curing agent amount of the mixed red clay accounts for 7-12% of the mass of the mixture of the red clay and the red clay curing agent.
The pavement base material is prepared from the following raw materials in parts by mass: 30 parts of solidified red clay and 70 parts of broken stone, wherein the solidified red clay is prepared by mixing the red clay curing agent in the red clay according to the mass part, and the mass of the mixed red clay curing agent accounts for 9 percent of the mass of the mixture of the red clay and the red clay curing agent.
The pavement base material is prepared by mixing 45-50 parts of fly ash; 1-5 parts of silica fume; 18-22 parts of Portland cement; 3-7 parts of gypsum; 8-12 parts of sodium carbonate; 8-12 parts of sodium silicate; 0.1-1 part of sodium fluosilicate; 1-5 parts of water-soluble polymer.
The pavement base material is prepared by mixing 46 parts of fly ash; 1-5 parts of silica fume; 20 parts of Portland cement; 4 parts of gypsum; 10 parts of sodium carbonate; 10 parts of sodium silicate; 0.3 part of sodium fluosilicate; 1-5 parts of water-soluble polymer.
The pavement base material is prepared from superfine fly ash with the particle size of 0.9-5 mu m.
The water-soluble polymer is one or a mixture of more than one of magnesium aluminum silicate, lithium magnesium silicate, sodium magnesium silicate, bentonite and modified bentonite.
The broken stone is broken stone of a road quarry, the grain diameter is less than 25mm, and the content of fine aggregate accounts for about 20%.
Compared with the prior art, the applicant manufactures the pavement base material by compounding the cured and improved red clay and the graded broken stones under the influence of the regional distribution of the red clay, and in order to prove the superiority of the pavement base material, the applicant performs related experiments, and tests the strength, modulus and bearing capacity of the roadbed pavement according to related technical specifications after using the pavement base material, and the detection results of indexes of each structural layer are as follows:
TABLE 1 index test results of each structural layer
It can be seen from table 1 and fig. 13 that, under the condition that the doping amount of the red clay curing agent is not changed, the deflection and bearing plate detection results of each structure type with different gravel doping amounts can both meet the design requirements, and the actual measurement result of the bearing plate on the top surface of the base layer can indicate that the rebound modulus of the top surface of the base layer is increased along with the increase of the gravel doping amount.
To demonstrate the cost advantage of the novel pavement base material, the applicant carried out a comparison of the engineering quantities and the costs of the different materials, as shown in the following table:
TABLE 2 Cement stabilized macadam, lime + fly ash + macadam for highways
Material cost comparison with Red Clay curing Material (1000 m)2)
As can be seen from comparative analysis of the material costs of Table 2, per 1000m2Compared with a lime + fly ash + gravel base layer, the red clay solidified material base layer (with the compacted thickness of 36 cm) saves 18823.30 yuan of material cost and saves about 43% of cost; every 1000m2Compared with the cement stabilized macadam base layer, the red clay solidified material base layer saves the material cost by 13102.40 yuan, and saves the cost by about 35%.
In conclusion, the red clay after being cured and improved by the red clay curing agent and the graded broken stones are compounded to be used as the base material of the pavement, so that the pavement performance is good, the material cost is low, the good technical and economic effects are obtained, and the pavement has good market and application prospects.
Meanwhile, the applicant designs and develops a new red clay curing agent according to the characteristics of the red clay, the red clay curing agent is formed by combining multi-unit materials, the mechanical strength of a red clay foundation can be improved, and the effect of the red clay curing agent can be reflected by the following test data and theories
1) Effect of curing agent Material
① physical effects
Adopting a microscopic analysis method to analyze and research each unit material of the red clay curing agent, and combining detection data to obtain the following conclusion:
a. microaggregate effect, as shown in figure 1: with the formula of the curing agent shown in figure 1, the technicians think that the curing agent simultaneously adopts the admixtures of composite active mineral ultrafine fly ash, silica fume and the like, and the micro-aggregate effect generated in the hydration, coagulation and hardening processes of the cementing material is better than the micro-aggregate effect of a single mineral admixture.
b. Morphological effects, as shown in fig. 2: with reference to fig. 2 and the formula of the curing agent, the skilled person thinks that the ultrafine fly ash, the silica fume, the portland cement and the like are adopted simultaneously, so that the effect of complementary shapes can be achieved, and the effect of improving the macroscopic performance of the red clay curing agent is achieved from the microstructure.
c. Pozzolanic effect, as shown in figure 3: with reference to fig. 3 and the formula of the curing agent, the technical staff thinks that the curing agent simultaneously adopts ultrafine fly ash, silica fume, portland cement and the like, and the curing agent is mutually excited in the hydration process to form a composite gelling system, which is beneficial to the formation of good micro-gradation of the red clay curing agent, thereby improving the macroscopic performance of the red clay curing agent.
d. Interfacial effect, as shown in fig. 4: with the formula of fig. 4 and the curing agent, the skilled person considers that the fly ash, the silica fume and other particles have small sizes and good water retention property, and can inhibit the formation of water films around the aggregate, thereby improving the structure of an interface transition region and enhancing the cohesive force of a colloid-aggregate interface.
② chemical reaction
a. Pozzolanic reaction
The pozzolan reaction is the most fundamental factor in the development of the strength of the red clay curatives of the present application. Under certain compaction conditions, a series of physical and chemical changes occur inside the red clay curing agent, and the primary chemical reaction is that calcium silicate hydrate (3 Ca. SiO) is respectively generated between the alkaline activator and the active silicon oxide and the active aluminum oxide in the fly ash2·nH2O) and hydrated calcium aluminate (3 CaO. Al)2O3·nH2O), the chemical reaction is:
3Ca(OH)2+SiO2+(n-3)H2O→3CaSiO2·nH2O
3Ca(OH)2+Al2O3+(n-3)H2O→3CaAl2O3·nH2O
the product is named as C-S-H gel and has good water stability and frost resistance.
b. Ettringite formation reaction
The C-S-H gel generated by the volcanic ash reaction is not the final product of the SSJY-NO. 1 red clay curing agent, and the hydrated calcium aluminate in the C-S-H gel continues to react with the main component of calcium sulfate dihydrate (CaSO) in the phosphogypsum4·2H2O) further react to generate trisulfide type hydrated calcium aluminate (3 CaO. Al)2O3·3CaSO4·32H2O) (referred to as ettringite AFt). The chemical reaction formula is as follows:
3CaO·Al2O3·n H2O+3CaSO4•2H2O+(32-6-n) H2O
→3CaO·Al2O3·3CaSO4·32H2O
the resulting ettringite crystals grew vigorously and developed completely, and were packed in columnar (needle) -like structures between the particles, and when they were densely grown and cross-linked together, they formed a crystal skeleton, which was combined with C-S-H gel and hexagonal plate-like Ca (OH)2The crystals are interwoven to form a structure with a three-dimensional spatial crystalline network. The structure is different from a loose and condensed structure of soil, and can endow the red clay with better strength, so that a firm crystalline net frame structure which has a reinforcing effect on the soil is formed in the red clay along with the hydration reaction of a solidified material. In addition, the red clay curing agent can generate ettringite in the early stage of hydration, can improve the early strength, can be inserted into gaps of soil aggregates along with the growth and the extension of ettringite needle crystals, and plays a role in reinforcing the withdrawing type reinforcement.
2) Engineering effect
Through an orthogonal test, 0%, 3%, 5%, 9%, 11% and 13% of red clay curing agents are respectively mixed into the red clay, and after curing for 7 days, 28 days and 60 days, the physical and mechanical properties of the red clay are analyzed, wherein the specific characteristics are as follows:
①% water content
TABLE 3 moisture content variation
As can be seen from the change in water content in Table 3, the addition of a small amount of the red clay curing agent had little effect on the water content. The water content of the red clay does not change much with the increase of the content of the red clay curing agent and does not increase with the increase of the curing time no matter the drying is carried out at the temperature of 60 ℃ or the drying is carried out at the temperature of 110 ℃.
② liquid plastic limit
As can be seen from tables 4-6, the liquid limit of the red clay decreases as the content of the red clay curing agent increases; the plastic limit has little change along with the increase of the content of the red clay curing agent; the plasticity index decreases as the red clay curing agent content increases.
③ water stability
TABLE 7 Red Clay flooding for different Red Clay curing agent contents
As can be seen from Table 7, the water stability of the red clay increased with the increase in the curing agent content of the red clay, and also increased with the increase in curing time. When the content of the curing agent for red clay is too low, for example, 3% or 5%, the difference in expansibility between the cured portion and the uncured portion is increased and the red clay is rapidly destroyed because the red clay is not fully cured, so that the destruction rate exceeds that of the pure red clay.
④ expansion and contraction
As shown in FIGS. 6 to 9, as the content of the red clay curing agent increases, the free expansion rate decreases rapidly, the expansion stress tends to decrease, and the shrinkage factor tends to decrease.
⑤ unconfined compressive strength
TABLE 8 unconfined compressive strength test
As can be seen from fig. 10 and table 8, as the content of the red clay curing agent increases, the unconfined compressive strength tends to decrease at 3% and 5%, and then increases rapidly; the strength of the pure soil and the red clay with the curing agent content of 3 percent is increased along with the maintenance time, and the unconfined compressive strength is kept unchanged; the unconfined compressive strength of the red clay with 5% curing agent content slightly decreased with time. The applicant has found that at low levels of red clay curing agent, the curing agent is not sufficient to allow the red clay particles mixed therewith to coexist and the cohesion between them is lower than that between the red clay particles, resulting in a decrease in the cohesion thereof.
⑥ shear strength
TABLE 9 shear Strength test
Note: each shear strength is an average of 6 specimens.
As can be seen from the tables of FIGS. 11 and 9, the shear strength variation law of the different red clay curing agents is consistent with the unconfined compressive strength. It increases the cohesion of the whole sample due to the gelation of the red clay curing agent, and relatively reduces the influence of the vertical stress thereon.
⑦ modulus of restitution
Statistics from table 10 show that: the modulus of resilience increases rapidly with increasing red clay curative content.
In conclusion, the red clay after being cured and improved by the red clay curing agent and the graded broken stones are compounded to be used as the base material of the pavement, so that the pavement performance is good, the material cost is low, and the good technical and economic effects are obtained.
In addition, because the base material of the pavement adopts a large amount of red clay waste, resources such as cement, lime and the like are saved; the pollution of local engineering wastes is reduced; the damage to mountains and farmlands caused by exploiting natural soil and stone materials in highway engineering is reduced; can improve the quality of highway engineering and prolong the service life, thereby being beneficial to environmental protection and having remarkable social benefit.
Drawings
FIG. 1 is a diagram showing the effect of the micro-aggregate formed by the red clay curing agent;
FIG. 2 is a diagram showing the morphological effect of the present red clay solidifying agent;
FIG. 3 is a graph showing the pozzolanic effect of the red clay curative;
FIG. 4 is a graph of the interface effect formed by the present red clay curing agent;
FIG. 5 is a structural diagram of an ettringite crystal net frame formed by the red clay curing agent;
FIG. 6 is a graph of the free expansion ratio versus the present red clay curing agent content;
FIG. 7 is a graph of swelling stress versus the present red clay curing agent content;
FIG. 8 is a graph of shrinkage factor versus the present red clay curing agent content;
FIG. 9 is a graph of swelling rate versus the present red clay curing agent content at different pressures;
FIG. 10 is a graph of unconfined compressive strength versus curing agent content;
FIG. 11 is a graph of shear strength curves for different red clay curative contents;
FIG. 12 is a graph of modulus of restitution versus red clay curative content;
FIG. 13 is a graph of composite material versus measured modulus of restitution for varying stone loadings.
Detailed Description
Example 1, preparation of red clay curing agent: taking 45kg of fly ash; 1kg of silica fume; 18kg of Portland cement; 3kg of gypsum; 8kg of sodium carbonate; 8kg of sodium silicate; 0.1kg of sodium fluosilicate; 1kg of water-soluble polymer is mixed and stirred to obtain the red clay curing agent. The fly ash used is ultra-fine fly ash with the particle size of 0.9-5 mu m; the water-soluble polymer is one or more of magnesium aluminum silicate, magnesium lithium silicate, sodium magnesium silicate, bentonite and modified bentonite.
Preparation of solidified red clay: 70kg of prepared red clay curing agent and 930kg of red clay are uniformly mixed to obtain the cured red clay.
Preparation of the pavement base material: 600kg of macadam and 400kg of solidified red clay are mixed to obtain the pavement base material.
The construction strictly complies with the relevant technical specifications, the impurities such as stones and the like on the original surface of the subbase are removed, and before the aggregate is paved, the surface of the subbase layer is sprayed with water to wet the surface of the subbase layer, but the subbase layer is not excessively wet to cause mud; after being mixed by sprinkling water, the pavement base material is fully moistened, and the sprinkling water adopts the optimal water content; after the rolling of each section of the stabilizing layer is finished, the stabilizing layer is immediately cured after passing the compaction degree inspection, and the curing period is not less than 7 days.
Example 2, preparation of red clay curing agent, taking 50kg of fly ash; 5kg of silica fume; 22kg of Portland cement; 7kg of gypsum; 12kg of sodium carbonate; 12kg of sodium silicate; 1kg of sodium fluosilicate; 5kg of water-soluble polymer is mixed and stirred to obtain the red clay curing agent. The fly ash used is ultra-fine fly ash with the particle size of 0.9-5 mu m; the water-soluble polymer is one or more of magnesium aluminum silicate, magnesium lithium silicate, sodium magnesium silicate, bentonite and modified bentonite.
Preparation of solidified red clay: 120kg of red clay curing agent and 880kg of red clay are uniformly mixed to obtain the cured red clay.
Preparation of the pavement base material: and taking 800kg of broken stone and 200kg of solidified red clay, and mixing to obtain the pavement base material.
The construction strictly complies with the relevant technical specifications, the impurities such as stones and the like on the original surface of the subbase are removed, and before the aggregate is paved, the surface of the subbase layer is sprayed with water to wet the surface of the subbase layer, but the subbase layer is not excessively wet to cause mud; after being mixed by sprinkling water, the pavement base material is fully moistened, and the sprinkling water adopts the optimal water content; after the rolling of each section of the stabilizing layer is finished, the stabilizing layer is immediately cured after passing the compaction degree inspection, and the curing period is not less than 7 days.
Example 3 preparation of red clay curing agent: taking 460kg of fly ash; 50kg of silica fume; 200kg of Portland cement; 40kg of gypsum; 100kg of sodium carbonate; 100kg of sodium silicate; 3kg of sodium fluosilicate; 50kg of water-soluble polymer is mixed and stirred to obtain the red clay curing agent. The fly ash used is ultra-fine fly ash with the particle size of 0.9-5 mu m; the water-soluble polymer is one or more of magnesium aluminum silicate, magnesium lithium silicate, sodium magnesium silicate, bentonite and modified bentonite.
Preparation of solidified red clay: and uniformly mixing 90kg of red clay curing agent and 910kg of red clay to obtain the cured red clay.
Preparation of the pavement base material: taking 700kg of macadam and 300kg of solidified red clay, and mixing to obtain the pavement base material.
The construction strictly complies with the relevant technical specifications, the impurities such as stones and the like on the original surface of the subbase are removed, and before the aggregate is paved, the surface of the subbase layer is sprayed with water to wet the surface of the subbase layer, but the subbase layer is not excessively wet to cause mud; after being mixed by sprinkling water, the pavement base material is fully moistened, and the sprinkling water adopts the optimal water content; after the rolling of each section of the stabilizing layer is finished, the stabilizing layer is immediately cured after passing the compaction degree inspection, and the curing period is not less than 7 days.
The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims (5)

1. A pavement base material characterized by: the material comprises the following raw materials in percentage by mass: 20-40 parts of solidified red clay and 60-80 parts of macadam; the solidified red clay is prepared by mixing the red clay curing agent in the red clay according to the mass part, and the curing agent of the mixed red clay accounts for 7-12% of the mass of the mixture of the red clay and the red clay curing agent; the red clay curing agent is prepared by mixing 45-50 parts of fly ash; 1-5 parts of silica fume; 18-22 parts of Portland cement; 3-7 parts of gypsum; 8-12 parts of sodium carbonate; 8-12 parts of sodium silicate; 0.1-1 part of sodium fluosilicate; 1-5 parts of a water-soluble polymer; the water-soluble polymer is one or a mixture of more than one of magnesium aluminum silicate, magnesium lithium silicate, sodium magnesium silicate, bentonite and modified bentonite.
2. The pavement base material of claim 1, wherein: the material comprises the following raw materials in percentage by mass: 30 parts of solidified red clay and 70 parts of broken stone, wherein the solidified red clay is prepared by mixing the red clay curing agent in the red clay according to the mass part, and the mass of the mixed red clay curing agent accounts for 9 percent of the mass of the mixture of the red clay and the red clay curing agent.
3. The pavement base material according to claim 1 or 2, characterized in that: the red clay curing agent is prepared by mixing the following raw materials in parts by mass, 46 parts of fly ash; 1-5 parts of silica fume; 20 parts of Portland cement; 4 parts of gypsum; 10 parts of sodium carbonate; 10 parts of sodium silicate; 0.3 part of sodium fluosilicate; 1-5 parts of water-soluble polymer.
4. The pavement base material according to claim 1 or 2, characterized in that: the fly ash is ultra-fine fly ash with the particle size of 0.9-5 mu m.
5. The pavement base material according to claim 1 or 2, characterized in that: the broken stone is broken stone of a road quarry, the grain diameter is less than 25mm, and the content of fine aggregate accounts for 20%.
CN201710803719.2A 2017-09-08 2017-09-08 Pavement base material Active CN107512891B (en)

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CN109896794B (en) * 2019-04-24 2021-11-30 贵州净界科技有限公司 Roadbed composite material prepared by utilizing manganese-polluted clay and preparation method thereof
CN113563043A (en) * 2021-08-13 2021-10-29 贵州大学 Phosphogypsum-stabilized red clay roadbed material and preparation method thereof

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EP0990627A1 (en) * 1998-10-02 2000-04-05 Rohrbach Zement GmbH & Co. KG Hydraulic binder having reduced shrinkage and its use
CN102344813B (en) * 2011-07-18 2014-04-02 徐辰楚 Curing agent for curing marine poor subsoil
CN104631253A (en) * 2013-11-08 2015-05-20 五冶集团上海有限公司 Improvement and filling method of red clay subgrades at zone 94 and zone 96 of highway
CN105776987A (en) * 2014-12-17 2016-07-20 王叶苗 Energy-saving and environmental-protection soil solidifying agent
CN105367010B (en) * 2015-10-30 2020-01-21 郑卫忠 Curing agent for road and base curing method
CN105802266B (en) * 2016-04-25 2018-12-11 广州市市政工程维修处 A kind of super viscous thin layer rubber cement sealing mixture in road surface and preparation method thereof

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