Cement stabilized macadam mixture and pavement

Abstract

The invention provides a cement stabilized macadam mixture and a pavement, and relates to the technical field of pavement paving construction. The cement stabilized macadam mixture is prepared from the following materials in parts by weight: 68 to 72 parts of coarse aggregate, 28 to 32 parts of fine aggregate, 4 parts of cement and 4.3 parts of water, wherein the particle size of the coarse aggregate is 9.5-31.5 mm, and the particle size of the fine aggregate is less than 9.5 mm. The cement stabilized macadam pavement comprises a base layer, and the base layer adopts the cement stabilized macadam mixture as a structural layer material. By adopting the cement stabilized macadam mixture as a structural layer material, on the basis of the prior art, the ratio of coarse aggregates to fine aggregates is optimized, the use amount of the coarse aggregates is increased, the use amount of the fine aggregates is reduced, and gaps among the coarse aggregates are filled with the fine aggregates, so that the gaps among the coarse aggregates are reduced while the structural strength is ensured; the effect of effectively preventing water damage can be achieved, and the service life of the pavement is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of road paving construction, in particular to a cement-stabilized crushed stone mixture and a road surface. Background Art

[0002] Cement-stabilized crushed stone mixture is widely used as a structural layer material for highway construction. The pavement using cement-stabilized crushed stone mixture has the advantages of high strength, good stability, high rigidity, convenient construction and relatively low price. However, it is also easily affected by external conditions, such as temperature and humidity, which cause drying shrinkage, temperature shrinkage, etc. The generated microcracks continue to expand during use and are eventually reflected to the surface layer to form reflective cracks. At the same time, rainwater seeping from the road surface will gradually penetrate into the roadbed structural layer and be difficult to discharge, which will directly lead to a significant reduction in the bearing capacity of the pavement. Moreover, under the complex effects of driving load and temperature environment, the cracks will expand rapidly, thus becoming a fatal defect of cement-stabilized crushed stone applied to the pavement base. Summary of the invention

[0003] The purpose of the present invention is to provide a cement-stabilized crushed stone mixture and a road surface, so as to solve the technical problem that the cement-stabilized crushed stone mixture and the road surface in the prior art are prone to cracks.

[0004] In a first aspect, the present invention provides a cement-stabilized crushed stone mixture, which is composed of the following materials in parts by weight: 68-72 parts of coarse aggregate, 28-32 parts of fine aggregate, 4 parts of cement and 4.3 parts of water; wherein the particle size of the coarse aggregate is 9.5 mm to 31.5 mm, and the particle size of the fine aggregate is less than 9.5 mm.

[0005] In an optional embodiment, the material is composed of the following parts by weight: 70-71 parts of coarse aggregate, 29-30 parts of fine aggregate, 4 parts of cement and 4.3 parts of water.

[0006] In an optional embodiment, the material is composed of the following parts by weight: 71 parts of coarse aggregate, 29 parts of fine aggregate, 4 parts of cement and 4.3 parts of water.

[0007] In an optional embodiment, the coarse aggregate includes 43-45 parts of No. 1 aggregate and 27-28 parts of No. 2 aggregate, wherein the particle size of the No. 1 aggregate is 19 mm to 31.5 mm, and the particle size of the No. 2 aggregate is 9.5 mm to 19 mm.

[0008] In an alternative embodiment, the coarse aggregate includes 43 parts of No. 1 aggregate and 28 parts of No. 2 aggregate.

[0009] In an optional embodiment, the fine aggregate includes 5 parts of No. 3 aggregate and 23-24 parts of No. 4 aggregate, wherein the particle size of the No. 3 aggregate is 4.75 mm to 8 mm, and the particle size of the No. 4 aggregate is less than 4.75 mm.

[0010] In an alternative embodiment, the fine aggregate includes 5 parts of No. 3 aggregate and 24 parts of No. 4 aggregate.

[0011] In an optional embodiment, the grading range of the cement-stabilized crushed stone mixture is: a 31.5 mm sieve hole pass rate of 100%, a 19 mm sieve hole pass rate of 74% to 84%, a 9.5 mm sieve hole pass rate of 42% to 55%, a 4.75 mm sieve hole pass rate of 28% to 32%, a 2.36 mm sieve hole pass rate of 20% to 26%, a 0.6 mm sieve hole pass rate of 8% to 15%, and a 0.075 mm sieve hole pass rate of less than 5%.

[0012] In an optional embodiment, the grading range of the cement-stabilized gravel mixture is: 100% through a 31.5 mm sieve hole, 81.6% through a 19 mm sieve hole, 54.4% through a 9.5 mm sieve hole, 28.7% through a 4.75 mm sieve hole, 22% through a 2.36 mm sieve hole, 8.8% through a 0.6 mm sieve hole, and 3.5% through a 0.075 mm sieve hole.

[0013] The cement-stabilized crushed stone mixture provided by the present invention optimizes the ratio of coarse aggregate and fine aggregate on the basis of the existing technology, increases the amount of coarse aggregate and reduces the amount of fine aggregate, and uses the fine aggregate to fill the gaps between the coarse aggregates. While ensuring the structural strength, the gaps between the coarse aggregates are reduced, which can effectively prevent water damage and extend the service life of the road surface.

[0014] In a second aspect, the present invention provides a cement-stabilized crushed stone pavement, comprising a base layer, wherein the base layer adopts the cement-stabilized crushed stone mixture as described in any one of the aforementioned embodiments as a structural layer material.

[0015] The cement-stabilized crushed stone pavement provided by the present invention adopts the above-mentioned cement-stabilized crushed stone mixture as the structural layer material, optimizes the ratio of coarse aggregate and fine aggregate on the basis of the existing technology, increases the amount of coarse aggregate and reduces the amount of fine aggregate, and uses fine aggregate to fill the gaps between the coarse aggregates. While ensuring the structural strength, the gaps between the coarse aggregates are reduced, which can effectively prevent water damage and extend the service life of the pavement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A drawing showing a composition table of cement-stabilized crushed stone mixture provided in Embodiments 1 to 4 of the present invention;

[0018] Figure 2 A diagram showing a gradation range table of a cement-stabilized crushed stone mixture provided in Example 1 of the present invention;

[0019] Figure 3 A schematic diagram of the on-site mixing effect of the cement-stabilized crushed stone mixture provided in the first embodiment of the present invention;

[0020] Figure 4 A schematic diagram of a pavement of a cement-stabilized crushed stone mixture provided as a comparative example;

[0021] Figure 5 A schematic diagram of a cement-stabilized macadam road surface provided in Embodiment 5 of the present invention;

[0022] Figure 6 It is a diagram of the statistical table of crack-related indicators of the comparative example and the fifth embodiment. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0030] Embodiment 1

[0031] Embodiment 1 provides a cement-stabilized crushed stone mixture, which is composed of the following materials in parts by weight: 71 parts of coarse aggregate, 29 parts of fine aggregate, 4 parts of cement and 4.3 parts of water; wherein the particle size of the coarse aggregate is 9.5 mm to 31.5 mm, and the particle size of the fine aggregate is less than 9.5 mm.

[0032] The coarse aggregate includes 43 parts of No. 1 aggregate and 28 parts of No. 2 aggregate, wherein the particle size of No. 1 aggregate is 19 mm to 31.5 mm, and the particle size of No. 2 aggregate is 9.5 mm to 19 mm.

[0033] The fine aggregate includes 5 parts of No. 3 aggregate and 24 parts of No. 4 aggregate, wherein the particle size of No. 3 aggregate is 4.75 mm to 8 mm, and the particle size of No. 4 aggregate is less than 4.75 mm.

[0034] The composition of the cement stabilized crushed stone mixture of Example 1 can also be found in Figure 1 .

[0035] Compared with the current common practices and recommended indicators, this embodiment reduces the amount of No. 3 aggregate in the fine aggregate and only uses 5 parts of No. 3 aggregate, while increasing the amount of coarse aggregate to 71 parts of coarse aggregate. While ensuring the structural strength, the fine aggregate is used to fill the gaps between the coarse aggregates, which also reduces the gaps between the aggregates, and can effectively prevent factors such as water damage.

[0036] See also Figure 2 The gradation range of the cement-stabilized crushed stone mixture provided in Example 1 is: the gradation range of the cement-stabilized crushed stone mixture is: the pass rate of 31.5 mm sieve hole is 100%, the pass rate of 19 mm sieve hole is 72% to 84%, the pass rate of 9.5 mm sieve hole is 40% to 55%, the pass rate of 4.75 mm sieve hole is 28% to 32%, the pass rate of 2.36 mm sieve hole is 20% to 26%, the pass rate of 0.6 mm sieve hole is 8% to 15%, and the pass rate of 0.075 mm sieve hole is less than 4.5%.

[0037] Figure 2 The construction range is the pass rate range of each sieve hole. Serial numbers 1-4 are the actual pass rates of each sieve hole collected during the construction process.

[0038] In sequence number 1, the pass rate of 31.5 mm sieve hole is 100%, the pass rate of 19 mm sieve hole is 80.4%, the pass rate of 9.5 mm sieve hole is 47.2%, the pass rate of 4.75 mm sieve hole is 31.4%, the pass rate of 2.36 mm sieve hole is 21.0%, the pass rate of 0.6 mm sieve hole is 9.8%, and the pass rate of 0.075 mm sieve hole is 4.2%.

[0039] In sequence number 2, the pass rate of 31.5 mm sieve hole is 100%, the pass rate of 19 mm sieve hole is 82.5%, the pass rate of 9.5 mm sieve hole is 49.5%, the pass rate of 4.75 mm sieve hole is 31.0%, the pass rate of 2.36 mm sieve hole is 24.9%, the pass rate of 0.6 mm sieve hole is 13.5%, and the pass rate of 0.075 mm sieve hole is 3.9%.

[0040] In sequence number 3, the pass rate of 31.5 mm sieve hole is 100%, the pass rate of 19 mm sieve hole is 82.6%, the pass rate of 9.5 mm sieve hole is 48.3%, the pass rate of 4.75 mm sieve hole is 31.6%, the pass rate of 2.36 mm sieve hole is 24.5%, the pass rate of 0.6 mm sieve hole is 9.8%, and the pass rate of 0.075 mm sieve hole is 4.0%.

[0041] In sequence number 4, the pass rate of 31.5 mm sieve hole is 100%, the pass rate of 19 mm sieve hole is 82.5%, the pass rate of 9.5 mm sieve hole is 49.5%, the pass rate of 4.75 mm sieve hole is 31.0%, the pass rate of 2.36 mm sieve hole is 24.9%, the pass rate of 0.6 mm sieve hole is 13.5%, and the pass rate of 0.075 mm sieve hole is 3.9%.

[0042] In the above-mentioned distribution range, the pass rate of each size of sieve hole is adjusted, especially the pass rate of the key sieve hole 4.75 mm is adjusted to 31.4%, and the pass rate of the 2.36 mm sieve hole is adjusted to 21.0%, which is more convenient for controlling the amount of No. 3 aggregate and the slightest aggregate in the cement-stabilized gravel mixture during on-site production, and is more convenient for forming the cement-stabilized gravel mixture in Example 1.

[0043] The schematic diagram of the on-site mixing effect of the cement-stabilized gravel mixture provided in Example 1 is as follows Figure 3 shown.

[0044] The cement-stabilized crushed stone mixture and its gradation range provided in the first embodiment are convenient for on-site construction, can reduce construction and personnel costs, and can obtain a cement-stabilized crushed stone mixture with better performance, reduce the occurrence of diseases, and solve the problem that the existing cement-stabilized crushed stone mixture is prone to cracks. The cement-stabilized crushed stone mixture provided in the first embodiment is particularly suitable for durable structural pavement, which reduces the occurrence of pavement diseases while enhancing the strength of the structure and prolongs the service life of the road.

[0045] Embodiment 2

[0046] Example 2 provides a cement-stabilized crushed stone mixture, consisting of the following materials in parts by weight: 69 parts of coarse aggregate, 31 parts of fine aggregate, 4 parts of cement and 4.3 parts of water; wherein the particle size of the coarse aggregate is 9.5 mm to 31.5 mm, and the particle size of the fine aggregate is less than 9.5 mm.

[0047] The coarse aggregate includes 42 parts of No. 1 aggregate and 27 parts of No. 2 aggregate, wherein the particle size of No. 1 aggregate is 19 mm to 31.5 mm, and the particle size of No. 2 aggregate is 9.5 mm to 19 mm.

[0048] The fine aggregate includes 5 parts of No. 3 aggregate and 26 parts of No. 4 aggregate, wherein the particle size of No. 3 aggregate is 4.75 mm to 8 mm, and the particle size of No. 4 aggregate is less than 4.75 mm.

[0049] Embodiment 3

[0050] Example 3 provides a cement-stabilized gravel mixture, consisting of the following materials in parts by weight: 68 parts of coarse aggregate, 32 parts of fine aggregate, 4 parts of cement and 4.3 parts of water; wherein the particle size of the coarse aggregate is 9.5 mm to 31.5 mm, and the particle size of the fine aggregate is less than 9.5 mm.

[0051] The coarse aggregate includes 44 parts of No. 1 aggregate and 24 parts of No. 2 aggregate, wherein the particle size of No. 1 aggregate is 19 mm to 31.5 mm, and the particle size of No. 2 aggregate is 9.5 mm to 19 mm.

[0052] The fine aggregate includes 5 parts of No. 3 aggregate and 27 parts of No. 4 aggregate, wherein the particle size of No. 3 aggregate is 4.75 mm to 8 mm, and the particle size of No. 4 aggregate is less than 4.75 mm.

[0053] Embodiment 4

[0054] Example 4 provides a cement-stabilized gravel mixture, consisting of the following materials in parts by weight: 72.5 parts of coarse aggregate, 28.5 parts of fine aggregate, 4 parts of cement and 4.3 parts of water; wherein the particle size of the coarse aggregate is 9.5 mm to 31.5 mm, and the particle size of the fine aggregate is less than 9.5 mm.

[0055] The coarse aggregate includes 44.5 parts of No. 1 aggregate and 27 parts of No. 2 aggregate, wherein the particle size of No. 1 aggregate is 19 mm to 31.5 mm, and the particle size of No. 2 aggregate is 9.5 mm to 19 mm.

[0056] The fine aggregate includes 5 parts of No. 3 aggregate and 23.5 parts of No. 4 aggregate, wherein the particle size of No. 3 aggregate is 4.75 mm to 8 mm, and the particle size of No. 4 aggregate is less than 4.75 mm.

[0057] Embodiment 5

[0058] Embodiment 5 provides a cement-stabilized gravel pavement, including a base layer, wherein the base layer adopts any cement-stabilized gravel mixture as described in Embodiment 1 to Embodiment 4 as a structural layer material.

[0059] A schematic diagram of a road surface using a cement-stabilized crushed stone mixture in the prior art is shown in FIG. Figure 4 As shown. Figure 4 In the figure, from left to right is the longitudinal extension of the road surface, and from top to bottom is the transverse structure of the road surface. Figure 4 In the middle part, dark crack structures extending from top to bottom can be observed, which are penetrating cracks.

[0060] This embodiment 5 provides a schematic diagram of a cement stabilized gravel road surface. Figure 5 As shown. Figure 5 In the figure, from left to right is the longitudinal extension of the road surface, and from top to bottom is the transverse structure of the road surface. Figure 5 A small number of inconspicuous crack structures extending from top to bottom can be observed. These cracks are non-penetrating cracks, generally 1-10 meters in length, and can be divided into two specifications: 1-5 meters and 5-10 meters.

[0061] Figure 6The crack-related indicators in the comparative example and Example 5 were statistically analyzed. The comparative example is a road surface using a cement-stabilized crushed stone mixture in the prior art.

[0062] The total length of the pavement in Example 5 is 14.102 kilometers, with a total of 185 cracks, an average of one crack every 76.2 meters, 151 through cracks, 9 cracks of 1 to 5 meters in length, and 25 cracks of 5 to 10 meters in length. On average, one through crack occurs every 93.4 meters.

[0063] The total length of the comparative road surface is 9.687 kilometers, with a total of 174 cracks, an average of one crack every 55.7 meters, 122 through cracks, 2 cracks of 1 to 5 meters in length, and 50 cracks of 5 to 10 meters in length. On average, one through crack occurs every 79.4 meters.

[0064] By comparing Example 5 with the comparative example, it can be clearly found that the frequency of cracks in the pavement of Example 5 is lower, with an average of one crack every 76.2 meters, while the pavement of the comparative example has an average of one crack every 55.7 meters. In particular, for highly harmful through cracks, the pavement of Example 5 has an average of one through crack every 93.4 meters, while the pavement of the comparative example has an average of one through crack every 79.4 meters. The frequency of through cracks in the pavement of Example 5 is significantly improved.

[0065] The pavement provided by the fifth embodiment has fewer cracks, thereby extending the service life of the pavement.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cement-stabilized crushed stone mixture, characterized in that: It is composed of the following materials in parts by weight: 68-72 parts of coarse aggregate, 28-32 parts of fine aggregate, 4 parts of cement and 4.3 parts of water; wherein the particle size of the coarse aggregate is 9.5 mm to 31.5 mm, and the particle size of the fine aggregate is less than 9.5 mm.

2. The cement-stabilized crushed stone mixture according to claim 1, characterized in that: It is composed of the following materials in parts by weight: 70-71 parts of coarse aggregate, 29-30 parts of fine aggregate, 4 parts of cement and 4.3 parts of water.

3. The cement-stabilized crushed stone mixture according to claim 2, characterized in that: It is composed of the following materials in parts by weight: 71 parts of coarse aggregate, 29 parts of fine aggregate, 4 parts of cement and 4.3 parts of water.

4. The cement-stabilized crushed stone mixture according to claim 1, characterized in that: The coarse aggregate includes 43-45 parts of No. 1 aggregate and 27-28 parts of No. 2 aggregate, wherein the particle size of the No. 1 aggregate is 19 mm to 31.5 mm, and the particle size of the No. 2 aggregate is 9.5 mm to 19 mm.

5. The cement-stabilized crushed stone mixture according to claim 4, characterized in that: The coarse aggregate includes 43 parts of No. 1 aggregate and 28 parts of No. 2 aggregate.

6. The cement-stabilized crushed stone mixture according to claim 1, characterized in that: The fine aggregate includes 5 parts of No. 3 aggregate and 23-24 parts of No. 4 aggregate, wherein the particle size of the No. 3 aggregate is 4.75 mm to 8 mm, and the particle size of the No. 4 aggregate is less than 4.75 mm.

7. The cement-stabilized crushed stone mixture according to claim 6, characterized in that: The fine aggregate includes 5 parts of No. 3 aggregate and 24 parts of No. 4 aggregate.

8. The cement-stabilized crushed stone mixture according to claim 1, characterized in that: The gradation range of cement stabilized crushed stone mixture is: The pass rate of 31.5 mm sieve hole is 100%, the pass rate of 19 mm sieve hole is 74% to 84%, the pass rate of 9.5 mm sieve hole is 42% to 55%, the pass rate of 4.75 mm sieve hole is 28% to 32%, the pass rate of 2.36 mm sieve hole is 20% to 26%, the pass rate of 0.6 mm sieve hole is 8% to 15%, and the pass rate of 0.075 mm sieve hole is less than 5%.

9. The cement-stabilized crushed stone mixture according to claim 8, characterized in that: The gradation range of cement stabilized crushed stone mixture is: The pass rate of 31.5 mm sieve hole is 100%, the pass rate of 19 mm sieve hole is 81.6%, the pass rate of 9.5 mm sieve hole is 54.4%, the pass rate of 4.75 mm sieve hole is 28.7%, the pass rate of 2.36 mm sieve hole is 22%, the pass rate of 0.6 mm sieve hole is 8.8%, and the pass rate of 0.075 mm sieve hole is 3.5%.

10. A cement-stabilized macadam road surface, characterized in that: The invention comprises a base layer, wherein the base layer adopts the cement-stabilized crushed stone mixture as described in any one of claims 1 to 9 as a structural layer material.

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