CN111548091A

CN111548091A - Concrete for road surface stabilizing layer and preparation method thereof

Info

Publication number: CN111548091A
Application number: CN202010429795.3A
Authority: CN
Inventors: 廖小成; 柳辉林
Original assignee: Shenzhen Dongdayang Building Material Co ltd
Current assignee: Shenzhen Dongdayang Building Material Co ltd
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2020-08-18

Abstract

The invention relates to the technical field of building materials, in particular to concrete for a road surface stabilizing layer, which is prepared from the following raw materials in parts by weight: portland cement: 70-110 parts of stone chips: 750 + 950 parts of stone: 1300 parts of 900-: 65-90 parts of an anti-cracking additive, wherein the anti-cracking additive comprises: 5-9 parts of montan wax, 2.5-5 parts of stearic acid, 20-85 parts of wollastonite powder, 2-5 parts of SBS particles, 3-10 parts of diluent and 0.5-1.5 parts of antioxidant. The material disclosed by the invention has the advantages of effectively preventing concrete from cracking, improving the flexural strength and toughness of the concrete, limiting the crack width and resisting the surface cracking of the concrete, is beneficial to large-scale construction, and has excellent mechanical properties in the aspects of compressive strength, crack resistance, impermeability and the like.

Description

Concrete for road surface stabilizing layer and preparation method thereof

Technical Field

The invention relates to the technical field of building materials, in particular to concrete for a road surface stabilizing layer and a preparation method thereof.

Background

Concrete is one of the most important civil engineering materials in the present generation, and is widely applied to aspects of the construction field. However, in the construction and use of many concrete structures, the problem of cracks has always been troubling engineers as an important problem of concrete durability, and concrete (especially bulk concrete, high-strength concrete, and the like) generally has a shrinkage phenomenon, which causes concrete cracking and performance reduction such as strength, thereby reducing the bearing capacity of the concrete structure, shortening the service life, and becoming a hidden danger of various disastrous accidents.

The invention discloses a glass fiber mixed concrete with the reference of an invention patent with the publication number of CN103979850B, which is characterized by being prepared from the following raw materials in parts by weight: 100-120 parts of cement, 2-5 parts of sodium thiosulfate, 45-70 parts of coarse quartz sand, 7-11 parts of glass fiber, 2-5 parts of magnesium oxide, 3-6 parts of potassium oxide, 15-18 parts of asbestos wool, 10-13 parts of hydroxyethyl cellulose, 60-80 parts of quick lime, 70-90 parts of expanded perlite, 35-50 parts of waste clothes, 3-6 parts of an auxiliary agent and a proper amount of water; the auxiliary agent is prepared from the following raw materials in parts by weight: 8-13 parts of kaolin, 6-9 parts of magnesium oxide, 1-3 parts of linseed oil, 0.2-0.5 part of sodium silicate, 0.02-0.04 part of polyphenyl ether, 9-12 parts of wheat straw, 8-10 parts of shrubalthea bark, 7-9 parts of asphalt, 0.01-0.03 part of aluminum powder, 2-4 parts of gum arabic and 1.3-2.5 parts of sodium hydroxide, and the preparation method comprises the steps of crushing and uniformly mixing the materials, adding a proper amount of water, stirring for 30-40 minutes, granulating, and drying to obtain the product with the particle size of 2-5 mm.

The above prior art solutions have the following drawbacks: the invention adopts glass fiber to prevent the problem of concrete cracks, but the glass fiber reinforced cement product is mainly used in the glass fiber concrete, and Ca (OH) in the cement stone liquid phase₂The silicon-oxygen bond of the glass fiber is broken, SiO₂And Ca (OH)₂Reaction takes place to form low calcium hydrated calcium silicate, and this reaction can proceed to SiO in the glass₂The compressive strength of the glass fiber is greatly reduced until the glass fiber is completely consumed, and the crack resistance of the concrete is deteriorated, so that the glass fiber cannot be applied to a concrete building structure on a large scale.

Disclosure of Invention

The first purpose of the invention is to provide a concrete for a road surface stabilizing layer, which has the advantage of high crack resistance. Meanwhile, the invention also aims to provide a preparation method of the concrete for the road surface stabilizing layer.

In order to achieve the first object, the invention provides the following technical scheme: the concrete for the pavement stabilizing layer is prepared from the following raw materials in parts by weight:

portland cement: 70-110 parts of (A) to (B),

stone chips: 750 portion and 950 portions of (A) and (B),

stone: 900-1300 parts of the raw materials,

water: 65-90 parts of (A) a mixture of (B),

an anti-cracking additive for the coating of a ceramic,

the anti-cracking additive comprises: 5-9 parts of montan wax, 2.5-5 parts of stearic acid, 2-5 parts of SBS particles, 20-85 parts of wollastonite powder, 3-10 parts of diluent and 0.5-1.5 parts of antioxidant.

By adopting the technical scheme, the graded mixture of the Portland cement, the stone chips, the stones, the water and the anti-cracking additive has higher strength and good cohesiveness with the cement, the SBS has excellent heat aging resistance, ozone resistance, ultraviolet resistance, wear resistance, flex resistance and low temperature resistance, the air permeability is good, meanwhile, the anti-slip property is good, the crude rubber strength and elasticity are good, the tensile strength, the hardness and the wear resistance of the concrete used for the pavement stabilizing layer are enhanced, so that the concrete used for the pavement stabilizing layer has excellent anti-cracking property, the concrete cracking is effectively prevented, the breaking strength and the toughness of the concrete are improved, the crack width is limited, and the surface cracking of the concrete is resisted, the material is beneficial to large-scale construction, can be widely applied to concrete structures in the fields of civil engineering, municipal traffic and the like, when the montan wax particles are used, the montan wax particles are fully mixed with all the components, the reaction of water and cement releases heat to soften or even melt lignite wax particles, the fluidity of concrete is further improved, gaps among coarse and fine aggregates are reduced, the mixing difficulty of the components can be reduced in the whole mixing process, the wollastonite powder can not only further reduce the gaps among the coarse and fine aggregates, but also further improve the mechanical property of the concrete for the pavement stabilizing layer, so that cracks of the concrete for the pavement stabilizing layer are reduced, stearic acid has good light and heat stability, the light and heat stability in the BSS using process is increased, the antioxidant is used for delaying or inhibiting the oxidation process of SBS particles, the service life of SBS particles is prolonged, the service life of the concrete for the theoretical stabilizing layer is prolonged, and the compressive strength, the compressive strength and the compressive strength of the concrete for the pavement stabilizing layer are enhanced through the addition of the anti-cracking additive, Cracking resistance, impermeability and other mechanical properties.

The invention is further configured to: the mud content of the stone chips is less than or equal to 0.4 percent, and the mud block content is less than or equal to 0.1 percent.

The invention is further configured to: the stones comprise fine stones and coarse stones, the particle size of the fine stones is 10-20mm, and the particle size of the coarse stones is 25-31.5 mm.

The invention is further configured to: the stones are composed of fine stones and coarse stones according to the weight ratio (3.8-4.8): (5.2-6.8) and mixing.

The invention is further configured to: the needle-like content of the stones was 6.2%, and the crushing index was 6.6%.

The invention is further configured to: the water-cement ratio of the concrete of the pavement stabilizing layer is 0.85-0.91.

By adopting the technical scheme, the water-cement ratio is too small or too large, the time required for the cracks to appear on the surface of the concrete is shorter, the maximum crack width of the concrete is larger, the number and the total length of the cracks are increased along with the reduction of the water-cement ratio, the compressive strength is reduced at the same time, and the chloride ion diffusion coefficient is increased to a certain extent by 84 d.

The invention is further configured to: the montan wax is crude wax.

By adopting the technical scheme, the crude wax contains 53-57% of wax ester, about 17% of free fatty acid and 20% -23% of resin, and also contains a small amount of ketone, asphaltene and free fatty alcohol, so that the cohesiveness and crack resistance of cement are easily increased.

The invention is further configured to: the diluent is one or more of benzene and toluene.

The invention is further configured to: the antioxidant is one or more of dilauryl thiodipropionate and triphenyl phosphite.

By adopting the technical scheme, the antioxidant is used for delaying or inhibiting the oxidation process of the SBS particles, and the service life of the SBS particles is prolonged, so that the service life of the concrete for the theoretical stable layer is prolonged.

In order to achieve the second object, the invention provides the following technical solutions: a preparation method of concrete for a road surface stabilizing layer comprises the following steps:

step 1: pouring 10-20 parts of water into a stirrer, and wetting the stirrer;

step 2: pouring the stone chips and the stones into a stirrer, and uniformly mixing to obtain a first mixture;

and step 3: adding the rest water into the first mixture, and uniformly stirring to obtain a second mixture;

and 4, step 4: adding cement, montan wax, SBS particles and antioxidant into the second mixture, and uniformly stirring and mixing to obtain a third mixture

And 5: and adding a diluent and stearic acid into the third mixture, and uniformly mixing to obtain the concrete for the pavement stabilizing layer.

In conclusion, the invention has the following beneficial effects:

1. by adding the anti-cracking additive, the concrete for the pavement stabilizing layer can effectively prevent the concrete from cracking, improve the breaking strength and toughness of the concrete, limit the crack width, resist the surface cracking of the concrete, and enhance the mechanical properties of the concrete of the pavement stabilizing layer in the application, such as the compressive strength, the anti-cracking performance, the anti-permeability performance and the like;

2. the raw materials in the anti-cracking additive are cheap and easy to obtain, so that the anti-cracking additive is beneficial to large-scale construction and can be widely applied to concrete structures in the fields of civil engineering, municipal traffic and the like;

3. the addition of the montan wax further improves the fluidity of the concrete, reduces the gaps among coarse and fine aggregates, can reduce the mixing difficulty of all components in the whole process in the mixing process, and improves the construction progress and efficiency;

4. the concrete for the pavement stabilizing layer is simple and rapid to prepare, and the construction progress and efficiency are improved while the performance of each aspect is ensured.

Detailed Description

The present invention will be described in further detail with reference to examples.

The portland cement producing place brand name: whelk; variety: stage 42.5; strength grade: the predicted strength is 50.1MPa after 28 days.

The stone producing area: huizhou.

The production area of the stone chips: huizhou.

Wollastonite powder is produced by Guangzhou hundred million peaking Industrial & scientific Co., 1250 mesh.

SBS granule is purchased from Shenzhen Yue Xuyang plastic import & export Limited company, number 411, type is standard material.

Example 1

The concrete raw materials of each cubic meter of the pavement stabilizing layer are as follows: 84 parts of Portland cement, 874 parts of stone chips, 1067 parts of stones, 75 parts of water and an anti-cracking additive. The anti-cracking additive comprises: 6 parts of montan wax, 45 parts of wollastonite powder, 3 parts of SBS particles, 3 parts of diluent and 1 part of antioxidant.

The stones comprise fine stones and coarse stones, wherein the fine stones 412 parts and the coarse stones 655 parts are used, the mass ratio of the fine stones to the coarse stones is 4.1:6.2, the particle size of the fine stones is 10-20mm, the particle size of the coarse stones 1 is 25-31.5mm, the needle-shaped content of the stones is 6.2%, and the crushing index is 6.6%.

The mud content of the stone chips is less than or equal to 0.4 percent, and the mud block content is less than or equal to 0.1 percent.

SBS is star-shaped styrene-butadiene-styrene triblock copolymer, montan wax is crude wax, diluent is toluene and ethyl acetate, and antioxidant is dilauryl thiodipropionate.

The preparation method of the concrete for the pavement stabilizing layer comprises the following preparation steps:

step 1: pouring 15 parts of water into a stirrer, and wetting the stirrer;

and 4, step 4: and adding cement, montan wax, SBS particles, a diluent and an antioxidant into the second mixture, and uniformly stirring and mixing to obtain the concrete for the pavement stabilizing layer.

Examples 2 to 5

Compared with the example 1, the concrete raw materials of each cubic meter of the pavement stabilizing layer are basically the same, one difference is that the raw material mixture ratio is different, and the concrete raw material mixture ratio of each cubic meter of the pavement stabilizing layer in the examples 1 to 5 is shown in the table 1; the other difference is that the specific components of the diluent and the antioxidant are different; the third difference is that the amount of water added in the step (1) of preparing the concrete for the road surface stabilizing layer is different, see table 2 specifically.

Comparative example 1

The difference from example 1 is that the stones were a mixture of fine stones and coarse stones in a weight ratio of 2.1:4.5, so that the weight fraction of fine stones in the stones in comparative example 1 was less than the weight fraction of any of examples 1-5, and the weight fraction of coarse stones was greater than the weight fraction of any of examples 1-5. Except for this, concrete for a road surface stabilizing layer was obtained in the same manner as in example 1.

Comparative example 2

The difference from example 1 is that the stones were a mixture of fine stones and coarse stones in a weight ratio of 5.2:3.8, so that the weight fraction of fine stones in the stones in comparative example 1 was greater than the weight fraction of any of examples 1-5, and the weight fraction of coarse stones was less than the weight fraction of any of examples 1-5. Except for this, concrete for a road surface stabilizing layer was obtained in the same manner as in example 1.

Comparative example 3

Comparative example 3 is compared with example 1 except that the water-cement ratio of the concrete for the road surface stabilizing layer is 0.43, which is lower than that of any of examples 1 to 5, and except that the concrete for the road surface stabilizing layer is obtained in the same manner as in example 1.

Comparative example 4

Comparative example 4 is compared with example 1 except that the water-cement ratio of the concrete for the road surface stabilizing layer is 1.36, which is higher than that of any of examples 1 to 5, and except that the concrete for the road surface stabilizing layer is obtained in the same manner as in example 1.

Comparative example 5

Comparative example 5 is compared with example 1 except that the anti-crack additive does not contain SBS particles, and the others are identical with example 1, and concrete for a road surface stabilizing layer is obtained in the same manner as example 1.

Comparative example 6

Comparative example 6 is compared with example 1 except that montan wax was not contained in the anti-crack additive, and the other examples were identical with example 1, and concrete for a road surface stabilizing layer was obtained in the same manner as in example 1.

Comparative example 7

Comparative example 7 is compared with example 1 except that the anti-crack additive does not contain wollastonite powder, and the other is in accordance with example 1, and concrete for a road surface stabilizing layer is obtained in the same manner as in example 1.

Comparative example 8

Comparative example 8 is compared with example 1 except that the anti-crack additive does not contain stearic acid, and the others are in accordance with example 1, and concrete for a road surface stabilizing layer is obtained in the same manner as example 1.

Comparative example 9

Comparative example 9 is compared with example 1 except that the anti-crack additive does not contain an antioxidant, and the other is in accordance with example 1, and concrete for a road surface stabilizing layer is obtained in the same manner as example 1.

Compared with the example 1, the concrete raw materials of each cubic meter of the pavement stabilizing layer are basically the same, one difference is that the raw material proportion in the anti-crack additive is different, and the concrete raw material proportion of each cubic meter of the pavement stabilizing layer in the comparative examples 1 to 9 is shown in the table 3.

Table 1 formulation of concrete materials for the pavement stabilizing layers of examples 1-5.

Table 2 parts by weight of SBS, diluent, antioxidant and step (1) water for examples 1-5.

Table 3 concrete raw material composition table of the road surface stabilizing layers of comparative examples 1 to 9.

The tests of sampling, compaction, molding, health preserving and the like of the test piece are implemented according to the relevant regulations of the test regulation of inorganic binder stabilizing materials for highway engineering (JTGE 51-2009); the 7-day unconfined compressive strength, the cleavage strength and the like of the test piece prepared by the invention are implemented according to the relevant regulations of Highway engineering inorganic binder stable material test regulation (JTGE 51-2009).

Curing the concrete samples formed in the examples 1 to 5 and the comparative examples 1 to 9 to different ages, performing cracking and impermeability tests according to GB/T50082-2009 Standard test methods for Long-term Performance and durability of ordinary concrete, and testing the impermeability of the concrete by using a chloride ion mobility coefficient (RCM method); after the prepared cement concrete is subjected to standard curing for 28 days, the compressive strength is tested according to GB/T50081-2002 Standard test method for mechanical properties of ordinary concrete.

The implementation effect is as follows:

the concrete for the road surface stabilizing layer prepared in the above examples 1 to 5 was tested according to the test piece compaction, molding, curing and performance test standards, and the test data and results are shown in table 4; the concrete for road surface stabilizing layers prepared in the above comparative examples 1 to 9 was tested according to the test piece compaction, molding, curing and performance test standards, and the test data and results are shown in table 5.

The concrete test pieces for concrete curing of the road surface stabilizing layer prepared in the above examples 1 to 5 and comparative examples 1 to 3 were tested according to the test piece compaction, molding, curing and performance test standards, and the test data and results are shown in tables 6 and 7, respectively.

Table 4 summary of experimental data for examples 1-5.

Table 5 summary of the test data for comparative examples 1-9.

Table 6 summary of experimental data for examples 1-5.

Table 7 summary of the test data for comparative examples 1-9.

As can be seen from Table 4, the dry densities of examples 1-5 were minimized to 2.321g/cm with the addition of the anti-cracking additive³The compaction degree reaches 98 percent, the unconfined compressive strength of 7 days is more than 5MPa, even 5.96MPa, and the fracture resistance strength is more than 0.7MPa, which shows that the concrete for the road surface stabilizing layer prepared by the invention has stronger mechanical property and can be used on roads of various grades. The cement-based road surface stabilizing layer concrete has the advantages that the graded mixture of the Portland cement, the stone chips, the stones, the water and the anti-cracking additive has higher strength and good cohesiveness with the cement, the SBS has excellent heat aging resistance, ozone resistance, ultraviolet resistance, wear resistance, flex resistance and low temperature resistance, the air permeability is good, the anti-skidding performance is good, the crude rubber strength and elasticity are good, the tensile strength, the hardness and the wear resistance of the concrete used for the road surface stabilizing layer are enhanced, the concrete used for the road surface stabilizing layer concrete has excellent anti-cracking performance, the concrete cracking is effectively prevented, the flexural strength and the toughness of the concrete are improved, the crack width is limited, and the concrete surface cracking is resistedAnd concrete structures in the fields of municipal transportation and the like, when the montan wax particles are used, after the montan wax particles are fully mixed with each component, the water reacts with the cement to release heat, so that the montan wax particles become soft and even melt, the fluidity of the concrete is further improved, gaps among coarse and fine aggregates are reduced, in the mixing process, the mixing difficulty of all components can be reduced in the whole process, the wollastonite powder can not only further reduce the gaps between coarse and fine aggregates, but also further improve the mechanical property of the concrete for the pavement stabilizing layer, therefore, cracks of the concrete for the road surface stabilizing layer are reduced, stearic acid has good light and heat stability, the light and heat stability in the use process of BSS is increased, the antioxidant is used for delaying or inhibiting the oxidation process of SBS particles, the service life of the SBS particles is prolonged, and the service life of the concrete for the theoretical stabilizing layer is prolonged.

As can be seen from tables 5 to 7, it can be seen from comparison of example 1 with comparative examples 1 and 2 that the weight ratio of fine stone and coarse stone in comparative examples 1 and 2 exceeds the weight ratio specified in the claims of the present invention (3.8 to 4.8) in the case where the same kind and the same content of stone chips, cement content and anti-cracking additive are added: (5.2 to 6.8), the concrete for a road surface stabilizing layer prepared was inferior in all properties to the concrete for a road surface stabilizing layer prepared in example 1 in that the time required for cracks to appear on the concrete surface was shorter than that of example 1, the maximum crack width and the number of cracks appearing on the concrete were increased as compared with example 1, and the compressive strength and the barrier properties were decreased, which results indicate that only the fine stones and the coarse stones were (3.8 to 4.8) as defined in the claims of the present invention: (5.2-6.8), because when the weight parts of the coarse stones are larger than that of the fine stones, the gaps between the coarse stones are difficult to be fully filled and supported by the fine stones, and the time required for the cracks to appear in the comparative example 1 is shorter than that in the comparative example 2, and the maximum crack width and the number of cracks appearing in the concrete are increased compared with that in the comparative example 2, so that the mechanical strength of the concrete is influenced and the crack resistance and permeability of the concrete are also influenced; when the weight part of the fine stones is more than that of the coarse stones, good mechanical properties cannot be achieved, so that the strength of the concrete is poor, and thus the compressive strength of comparative example 2 is deviated from that of comparative example 1.

Referring to tables 6 and 7, comparing examples 1 to 5 with comparative examples 3 and 4, it can be seen that the cement ratio is too small or too large, the time required for cracks to appear on the concrete surface is shorter, the maximum crack width of the concrete is larger, the number and total length of cracks are increased along with the decrease of the cement ratio, the compressive strength is reduced, and the chloride ion diffusion coefficient is increased in 84d, because the concrete with low cement ratio shrinks more, the concrete strength is increased more rapidly, the elastic modulus is increased more rapidly, the release space of concrete stress is reduced, the cement ratio is too large, the water content in the concrete is high, larger gaps exist, and the cement hydration continues during the concrete hardening process, the cement stone structure is further densified, the water in the holes is lost, larger capillary tension is generated, and the concrete strength is affected, it also affects the hardening of the concrete to cause cracks, thereby reducing the strength of the concrete.

Referring to tables 4 to 7, in comparison example 5, compared with example 1, it can be seen that under the same stone chips, stone proportions and cement contents, the anti-cracking additive lacks SBS particles, the maximum dry density, compaction degree, compressive strength and anti-splitting degree of vibration compaction are greatly reduced compared with example 1, the diffusion coefficient of 84d chloride ions is greatly increased compared with example 1, the time required for cracks to appear on the surface of concrete is greatly shortened compared with example 1, the maximum crack width and the number of cracks appearing on concrete are also greatly increased compared with example 1, because SBS has better green strength and elasticity, and has great amplification effects on tensile strength, hardness and wear resistance of concrete of a pavement stabilizing layer, so that the concrete for the pavement stabilizing layer has excellent anti-cracking performance, effectively prevents concrete from cracking, improves the compressive strength and toughness of concrete, limiting the width of the crack and resisting the cracking of the concrete surface.

Comparative example 6 compared with example 1, it was found that the absence of montan wax in the anti-crack additive resulted in inferior mechanical properties in various aspects of concrete after the absence of montan wax compared with example 1 at the same stone chips, stone composition and cement content, but is preferable to comparative examples 1 to 5 and comparative examples 7 to 9, because when montan wax particles are used, after the montan wax particles are fully mixed with all the components, water reacts with cement to release heat, so that the montan wax particles become soft and even melt, the fluidity of concrete is further improved, all the materials of the concrete are more uniformly and fully mixed, and gaps among the coarse and fine aggregates are further reduced, and the more sufficient and uniform mixing among all the materials of the concrete is beneficial to the performance of all the materials of the concrete and the better synergistic effect among all the materials.

Comparative example 7 it was found that the absence of wollastonite powder in the anti-crack additive compared to example 1 resulted in a substantial decrease in the vibration compaction maximum dry density and compaction of concrete compared to example 1, a substantial increase in the 84d chloride ion diffusion coefficient compared to example 1, and resulted in comparative example 7 being the worst in vibration compaction maximum dry density, compaction and impermeability compared to comparative examples 1-5 and 7-9, because the wollastonite powder can be uniformly dispersed in the capillary pores between concrete particles, tightly packed, blocking or closing the capillary channels in the concrete, and improving the compaction and impermeability of the concrete, compared to comparative examples 1-5 and 7-9.

Comparative example 8 compared with example 1, it can be found that stearic acid is absent in the anti-crack additive under the same stone chip, stone proportion and cement content, and the stearic acid can increase the light and heat stability of the SBS particles in the using process, so that the absence of the auxiliary effect of the stearic acid on the SBS particles influences the performance of the SBS particles, and the anti-crack performance of the concrete sample obtained in comparative example 8 is poor.

Comparative example 9 compared with example 1, it can be found that under the same stone chip, stone particle ratio and cement content, the anti-cracking additive lacks an antioxidant, and the antioxidant can delay or inhibit the oxidation process of SBS particles, and prolong the service life of SBS particles, so as to prolong the service life of concrete for a theoretical stabilization layer, therefore, the lack of the auxiliary effect of the antioxidant on the SBS particles influences the performance of the SBS particles, and the later anti-cracking performance of the concrete sample obtained in comparative example 9 is poor.

By comparing example 1 with comparative examples 3 to 9, the vibration compaction maximum dry density, the degree of compaction, the unconfined compressive strength, and the degree of fracture resistance of the test piece to which the anti-cracking additive was added were all higher than those of the test piece to which the anti-cracking additive formulation was incomplete. This shows that the addition of the anti-crack additive can significantly improve the toughness and compressive property of the concrete for the pavement stabilizing layer, thereby effectively preventing the generation and development of cracks.

Referring to tables 6 and 7, comparing examples 1 to 5 with comparative examples 5 to 9, it can be seen that, when any one of SBS particles, montan wax, wollastonite powder, stearic acid, and an antioxidant is absent in the anti-crack additive, the time required for cracks to appear on the concrete surface is shortened, the maximum crack width of the concrete is increased, the number of cracks and the total length are increased as the water-cement ratio is decreased, the compressive strength is decreased, and the chloride ion diffusion coefficient is increased for 84d, wherein the SBS particles have the greatest influence on various properties of the concrete for a pavement stabilizing layer, and it can be known that the SBS particles have an important role in enhancing the compressive strength, anti-crack property, and anti-permeation performance of the concrete for a pavement stabilizing layer.

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

1. A concrete for a pavement stabilization layer, characterized in that: the concrete of the pavement stabilizing layer is prepared from the following raw materials in parts by weight:

portland cement: 70-110 parts of (A) to (B),

stone chips: 750 portion and 950 portions of (A) and (B),

stone: 900-1300 parts of the raw materials,

water: 65-90 parts of (A) a mixture of (B),

an anti-cracking additive for the coating of a ceramic,

the anti-cracking additive comprises: 5-9 parts of montan wax, 2.5-5 parts of stearic acid, 20-85 parts of wollastonite powder, 2-5 parts of SBS particles, 3-10 parts of diluent and 0.5-1.5 parts of antioxidant.

2. The concrete for a road surface stabilizing layer as claimed in claim 1, wherein: the mud content of the stone chips is less than or equal to 0.4 percent, and the mud block content is less than or equal to 0.1 percent.

3. The concrete for a road surface stabilizing layer as claimed in claim 1, wherein: the stones comprise fine stones and coarse stones, the particle size of the fine stones is 10-20mm, and the particle size of the coarse stones is 25-31.5 mm.

4. The concrete for a road surface stabilizing layer as claimed in claim 1, wherein: the stones are composed of fine stones and coarse stones according to the weight ratio (3.8-4.8): (5.2-6.8) and mixing.

5. The concrete for a road surface stabilizing layer as claimed in claim 1, wherein: the needle-like content of the stones was 6.2%, and the crushing index was 6.6%.

6. The concrete for a road surface stabilizing layer as claimed in claim 1, wherein: the water-cement ratio of the concrete of the pavement stabilizing layer is 0.85-0.91.

7. The concrete for a road surface stabilizing layer as claimed in claim 1, wherein: the montan wax is crude wax.

8. The concrete for a road surface stabilizing layer as claimed in claim 1, wherein: the diluent is one or more of benzene and toluene.

9. The concrete for a road surface stabilizing layer as claimed in claim 1, wherein: the antioxidant is one or more of dilauryl thiodipropionate and triphenyl phosphite.

10. The method for the preparation of recycled concrete according to any one of claims 1 to 9, characterized in that it comprises the following steps:

step 1: pouring 10-20 parts of water into a stirrer, and wetting the stirrer;