Quartz stone waste road subgrade cushion material and preparation method thereof

Abstract

The invention discloses a quartzite waste road subgrade cushion material and a preparation method thereof, and relates to the technical field of road subgrade cushion materials, the quartzite waste road subgrade cushion material comprises 10-15 parts of cement, 5-8 parts of water, 76-83 parts of sand and quartzite mixed waste and 1-2 parts of a water permeable agent; the quartzite waste road subgrade cushion material is prepared by mixing the cement, the water, the sand and quartzite mixed waste and the water permeable agent according to a specific proportion, the quartzite waste is reasonably utilized, meanwhile, the method is a resource-saving mode, and the prepared quartzite waste road subgrade cushion material has good water permeable performance and can be applied to the field of road subgrade cushion materials, and the service life of the quartzite waste road subgrade cushion material is prolonged. Water can be rapidly drained, the condition that a road is slippery due to rainwater accumulation is reduced, and therefore damage to the surface of the road is relieved, the service life of the road is prolonged, the safety performance of the road is improved, and traffic accidents are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of road subgrade cushion materials, in particular to a quartz stone waste road subgrade cushion material and a preparation method thereof. Background Art

[0002] The cushion layer refers to a pavement structure layer built with water-stable and heat-insulating materials between the base layer (or subbase) and the soil base in order to improve the moisture and temperature conditions of the soil base and ensure that the strength, stiffness and stability of the surface layer and base layer are not adversely affected by changes in the water and moisture conditions of the soil base. It is set between the base layer and the soil layer to play the role of drainage, water isolation, anti-freeze, and anti-fouling. It is generally paved with coarse-grained materials or stable materials with good water stability. The road subgrade cushion layer is a structural layer located between the roadbed and the base layer. Its main function is to optimize the roadbed performance, improve the structural stability, and extend the service life of the road surface.

[0003] In recent years, with the continuous improvement of people's material living standards, people's demand for artificial quartz stone slabs has also increased sharply. By 2023, the total output of artificial quartz stone slabs will increase to about 10 million tons. Artificial quartz stone slabs are made of more than 90% natural quartz sand and less than 10% unsaturated resin, colorant and other regulating adhesives and curing agents and other additives. After negative pressure vacuum and high-frequency vibration molding, the slabs are processed by high-temperature curing after heating. Due to its excellent properties such as scratch resistance, stain resistance, high temperature resistance, pressure resistance, easy cleaning and good water stability, it is widely used in many fields of home decoration around the world, especially in the application of kitchen and bathroom countertops. It is almost the most ideal material.

[0004] Quartz stone is the main raw material of artificial quartz stone slabs. It is widely distributed and abundant in resources. With the increasing demand for quartz stone for artificial quartz stone slabs, a large amount of waste stone (referring to quartz stone waste whose quartz content does not meet the technical requirements of artificial quartz stone slabs) is also produced. Many companies pile them in open fields and build large warehouses for storage, which not only causes serious pollution to the environment, but also occupies a large amount of land resources, which is actually a waste of resources.

[0005] In recent years, people have paid more and more attention to using sustainable economic development models to improve the utilization rate of stone, and have begun to pay attention to the comprehensive application of quartz stone waste. The application of quartz stone blocks as road subgrade cushion materials provides a bright prospect for its rational application of resources and also provides a broad application space for its resource conservation. Therefore, the present invention proposes a quartz stone waste road subgrade cushion material and a preparation method thereof to solve the problems existing in the prior art. Summary of the Invention

[0006] In view of the above problems, the purpose of the present invention is to propose a quartz stone waste road subgrade cushion material and a preparation method thereof, which solves the waste of quartz stone waste resources while protecting the environment and land resources.

[0007] In order to achieve the purpose of the present invention, the present invention is implemented through the following technical scheme: a quartz stone waste road subgrade cushion material, comprising the following raw materials in parts by weight: 10 to 15 parts of cement, 5 to 8 parts of water, 76 to 83 parts of sand and quartz stone mixed waste, and 1 to 2 parts of water permeable agent, wherein the mass ratio of sand to quartz stone waste in the sand and quartz stone mixed waste is 1:2 to 3.

[0008] A further improvement is that the cement is selected from silicate cement PO42.5 type.

[0009] A further improvement is that the water is selected from city tap water.

[0010] A further improvement is that the sand is selected from road sand with a particle size range of 0.063 to 2 mm.

[0011] A further improvement is that the particle size range of the quartz stone waste is 10-30 mm, and the quartz stone waste is composed of stone powder, 10-20 mm crushed stone and 20-30 mm crushed stone in a mass ratio of 2:49:49.

[0012] A further improvement is that the water permeable agent is selected from SR type permeable concrete reinforcing agent.

[0013] A method for preparing a quartz stone waste road subgrade cushion material comprises the following steps:

[0014] Step 1: First, weigh 10-15 parts of cement, 5-8 parts of water, 76-83 parts of sand and quartz stone mixed waste, and 1-2 parts of water permeable agent according to the following weight parts, then pour the weighed cement and sand and quartz stone mixed waste into a concrete mixer and mix and stir evenly to prepare a solid mixture;

[0015] Step 2: Add the weighed water and water permeable agent into the concrete mixer and continue to mix and stir. After mixing evenly, a mixed slurry is obtained, which is the finished product of the quartz stone waste road subgrade cushion material. The finished product of the quartz stone waste road subgrade cushion material is then transported to the road construction site for use.

[0016] A further improvement is that the cement, sand and quartz stone mixed waste is poured into a concrete mixer and stirred at a speed of 45 to 55 rpm for 20 to 25 minutes, and the water and water permeable agent are added into the concrete mixer and stirred for 5 to 10 minutes.

[0017] A further improvement is that the use of the finished quartz stone waste road subgrade cushion material at a road construction site includes the following steps:

[0018] S1. First, clean the existing roadbed at the road construction site, sweep the surface of the base with a broom, and sprinkle water to moisten it so that there is no water residue on the surface of the base;

[0019] S2. Evenly spread the finished quartz stone waste road subgrade cushion material on the pavement base, compact the mixture, keep the surface of the subgrade cushion moist, and then naturally cure for 10 to 12 days.

[0020] The beneficial effects of the present invention are as follows: the quartz stone waste road subgrade cushioning material of the present invention is prepared by mixing cement, water, sand, quartz stone mixed waste and a water permeable agent in a specific proportion, which plays a role in rational resource utilization of quartz stone waste and is also a way to save resources. The prepared quartz stone waste road subgrade cushioning material has good water permeability, can quickly drain water, reduce the situation where rainwater accumulation causes the road to be slippery, thereby slowing down the damage to the road surface, extending the service life of the road, improving the safety performance of the road, and reducing the occurrence of traffic accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a schematic flow chart of a method for preparing a quartz stone waste road subgrade cushion material. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] Quartz stone waste refers to the waste generated during the quartz stone processing process, including scraps, debris, powder, etc. These wastes usually come from the cutting, grinding, polishing and other processes of quartz stone slabs. Since quartz stone is a silicate mineral with high hardness and stable chemical properties, its waste has the characteristics of high hardness, good chemical stability and diverse particle size. Through reasonable treatment and recycling, quartz stone waste can not only reduce environmental pollution, but also provide low-cost, high-performance raw materials for related industries, achieving a win-win situation in economic and environmental benefits.

[0024] The road subgrade cushion layer refers to the structural layer located between the top of the roadbed and the pavement base layer. It is paved with materials with certain strength and stability. The main function of the cushion layer is to improve the performance of the roadbed, enhance the stability and durability of the pavement structure, and reduce the settlement and uneven deformation of the roadbed. The construction quality of the cushion layer directly affects the stability of the entire road project. Therefore, strict material quality control is required before construction to ensure that the cushion layer material is well graded, does not contain impurities, and the maximum particle size does not exceed the specified value. In addition, the thickness and width of the cushion layer also need to be determined according to the soil quality and bearing capacity requirements.

[0025] Example 1

[0026] The present embodiment provides a quartz stone waste roadbed cushion material, comprising the following raw materials in parts by weight: 10 parts cement, 5 parts water, 83 parts sand and quartz stone mixed waste, and 2 parts water permeable agent, wherein the mass ratio of sand to quartz stone waste in the sand and quartz stone mixed waste is 1:2, the cement is selected from silicate cement PO42.5 type, the water is selected from city tap water, and the sand is selected from road sand. The mud content is controlled to be ≤3% to avoid clogging of permeable pores, and the particle size range is 0.063-2 mm. The quartz stone waste is crushed and sieved to remove particles larger than 30 mm to ensure gradation continuity, and the particle size range is 10-30 mm. The water permeable agent is selected from SR type permeable concrete reinforcing agent. The material is characterized by being able to be mixed on site, convenient for construction, having good chemical reaction with the sand and quartz stone mixed waste and cement, and can be widely used as auxiliary equipment for motor vehicle lanes, non-motor vehicle lanes, pedestrian walkways, and various types of garden landscape roads.

[0027] The quartz stone waste in this embodiment is composed of stone powder, crushed stone with a particle size range of 10 to 20 mm, and crushed stone with a particle size range of 20 to 30 mm in a mass ratio of 2:49:49, wherein the stone powder is used to fill the gaps between the aggregates, improve the density, and reduce the amount of cement used, the crushed stone with a particle size of 10 to 20 mm is used to form a skeleton structure and enhance the compressive strength, and the crushed stone with a particle size of 20 to 30 mm is used to optimize the pore connectivity and ensure water permeability (permeability coefficient ≥ 0.2 cm / s).

[0028] See also Figure 1 This embodiment also provides a method for preparing a quartz stone waste roadbed cushion material, comprising the following steps:

[0029] Step 1: First, weigh 10 parts of cement, 5 parts of water, 83 parts of sand and quartz stone mixed waste, and 2 parts of water permeable agent according to the following weight parts, then pour the weighed cement and sand and quartz stone mixed waste into a concrete mixer and stir at a speed of 45 rpm for 25 minutes to obtain a solid mixture after mixing and stirring evenly;

[0030] Step 2: Add the weighed water and water permeable agent into the concrete mixer and continue stirring for 5 minutes. After mixing evenly, a mixed slurry is obtained, which is the finished product of the quartz stone waste road subgrade cushion material. The finished product of the quartz stone waste road subgrade cushion material is then transported to the road construction site for use. The specific steps for use are as follows:

[0031] S1. First, clean the existing roadbed at the road construction site, sweep the surface of the base with a broom, and sprinkle water to moisten it so that there is no water residue on the surface of the base;

[0032] S2. Ensure that the roadbed layer is clean and flat, and evenly lay the mixed quartz stone waste roadbed cushion material on the pre-prepared construction area, that is, the road surface base, and then use a vibrator to evenly vibrate and compact it to ensure the quality, density and flatness of the quartz stone waste roadbed cushion material. The thickness is controlled at 125mm±25mm to ensure the density and flatness of the cushion layer. Finally, cover it with a wet cloth and spray water to keep the surface of the roadbed cushion moist, and then naturally cure it for 10 days. After the quartz stone waste roadbed cushion material is completely dry, it can be put into use. At the same time, the production and construction of the quartz stone waste roadbed cushion material need to be carried out in dry weather conditions to avoid the influence of rainfall on the preparation quality.

[0033] Example 2

[0034] The present embodiment provides a quartz stone waste roadbed cushion material, comprising the following raw materials in parts by weight: 15 parts cement, 8 parts water, 76 parts sand and quartz stone mixed waste, and 1 part water permeable agent, wherein the mass ratio of sand to quartz stone waste in the sand and quartz stone mixed waste is 1:3, the cement is selected from silicate cement PO42.5 type, the water is selected from city tap water, and the sand is selected from road sand. The mud content is controlled to be ≤3% to avoid clogging of permeable pores, and the particle size range is 0.063-2 mm. The quartz stone waste is crushed and sieved to remove particles larger than 30 mm to ensure gradation continuity, and the particle size range is 10-30 mm. The water permeable agent is selected from SR type permeable concrete reinforcing agent. The material is characterized by being able to be mixed on site, convenient for construction, having good chemical reaction with the sand and quartz stone mixed waste and cement, and can be widely used as auxiliary equipment for motor vehicle lanes, non-motor vehicle lanes, pedestrian walkways, and various types of garden landscape roads.

[0035] The quartz stone waste in this embodiment is composed of stone powder, crushed stone with a particle size of 10 to 20 mm, and crushed stone with a particle size of 20 to 30 mm in a mass ratio of 2:49:49, wherein the stone powder is used to fill the gaps between the aggregates, improve the density, and reduce the amount of cement used, the crushed stone with a particle size of 10 to 20 mm is used to form a skeleton structure and enhance the compressive strength, and the crushed stone with a particle size of 20 to 30 mm is used to optimize the pore connectivity and ensure water permeability (permeability coefficient ≥ 0.2 cm / s).

[0036] See also Figure 1 This embodiment also provides a method for preparing a quartz stone waste roadbed cushion material, comprising the following steps:

[0037] Step 1: First, weigh 15 parts of cement, 8 parts of water, 76 parts of sand and quartz stone mixed waste, and 1 part of water permeable agent according to the following weight parts, then pour the weighed cement and sand and quartz stone mixed waste into a concrete mixer and stir at a speed of 55 rpm for 20 minutes to obtain a solid mixture after mixing and stirring evenly;

[0038] Step 2: Add the weighed water and water permeable agent into the concrete mixer and continue stirring for 10 minutes. After mixing evenly, a mixed slurry is obtained, which is the finished product of the quartz stone waste road subgrade cushion material. The finished product of the quartz stone waste road subgrade cushion material is then transported to the road construction site for use. The specific steps for use are as follows:

[0039] S1. First, clean the existing roadbed at the road construction site, sweep the surface of the base with a broom, and sprinkle water to moisten it so that there is no water residue on the surface of the base;

[0040] S2. Ensure that the roadbed surface is clean and flat, and evenly lay the mixed quartz stone waste roadbed cushion material on the pre-prepared construction area, that is, the road surface base, and then use a vibrator to evenly vibrate and compact it to ensure the quality, density and flatness of the quartz stone waste roadbed cushion material. The thickness is controlled at 125mm±25mm to ensure the density and flatness of the cushion layer. Finally, cover it with a wet cloth and spray water to keep the surface of the roadbed cushion moist, and then naturally cure it for 12 days. After the quartz stone waste roadbed cushion material is completely dry, it can be put into use. At the same time, the production and construction of the quartz stone waste roadbed cushion material need to be carried out in dry weather conditions to avoid the influence of rainfall on the preparation quality.

[0041] The quality inspection standards of the quartz stone waste road subgrade cushion material of the present embodiment are as follows:

[0042] 1.1 Quantitative detection of water permeability

[0043] Permeability coefficient test: Conduct a constant water head test according to the Technical Specifications for Permeable Cement Concrete Pavement (CJJ / T 135), with a requirement of ≥0.1cm / s;

[0044] 1.2 Strength and durability test

[0045] Compressive strength: 28-day standard curing test block ≥15MPa, strength loss ≤15% after 25 freeze-thaw cycles (-15~20℃);

[0046] Wear resistance: ball bearing method (ASTM C779), wear loss ≤ 0.8g / cm2 ;

[0047] 1.3 Environmental performance verification

[0048] Safety of quartz waste: The leaching concentration of heavy metals (lead, cadmium, etc.) was tested according to the "Toxicity Leaching Method for Solid Waste" (GB 5086), which complies with the Class III limit of the "Surface Water Environmental Quality Standard" (GB 3838);

[0049] 1.4 Construction process monitoring

[0050] The real-time detection items are shown in Table 1 below:

[0051] Table 1 Test items

[0052] Detection phase frequency method Moisture content 1 point per 200㎡ Drying method (105℃±5℃) Compaction 3 points per layer Sand filling method Flatness Measure one point every 50m 3m ruler

[0053] The test data during the construction process are shown in Table 2 below:

[0054] Table 2 Test data table (1000㎡)

[0055] Detection phase Standard requirements Measured average value Pass rate Compaction ≥93％ 94.2％ 100％ Moisture content 5.0～6.5％ 5.8％ 98％ Flatness deviation ≤10mm 6.3mm 95％

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A quartz stone waste road subgrade cushion material, characterized by: The invention comprises the following raw materials in parts by weight: 10 to 15 parts of cement, 5 to 8 parts of water, 76 to 83 parts of mixed waste of sand and quartz stone, and 1 to 2 parts of water permeable agent, wherein the mass ratio of sand to quartz stone waste in the mixed waste of sand and quartz stone is 1:2 to 3.

2. The quartz stone waste road subgrade cushion material according to claim 1, characterized in that: The cement is selected from Portland cement PO42.5 type.

3. The quartz stone waste road subgrade cushion material according to claim 1, characterized in that: The water is selected from city tap water.

4. The quartz stone waste road subgrade cushion material according to claim 1, characterized in that: The sand is selected from road sand, and the particle size range is 0.063-2 mm.

5. The quartz stone waste road subgrade cushion material according to claim 1, characterized in that: The particle size of the quartz stone waste is in the range of 10 to 30 mm, and the quartz stone waste is composed of stone powder, 10 to 20 mm crushed stone and 20 to 30 mm crushed stone in a mass ratio of 2:49:

49.

6. The quartz stone waste road subgrade cushion material according to claim 1, characterized in that: The water permeable agent is selected from SR type permeable concrete reinforcing agent.

7. The method for preparing a quartz stone waste road subgrade cushion material according to claim 1, characterized in that: The following steps are involved: Step 1: First, weigh 10-15 parts of cement, 5-8 parts of water, 76-83 parts of sand and quartz stone mixed waste, and 1-2 parts of water permeable agent according to the following weight parts, then pour the weighed cement and sand and quartz stone mixed waste into a concrete mixer and mix and stir evenly to prepare a solid mixture; Step 2: Add the weighed water and water permeable agent into the concrete mixer and continue to mix and stir. After mixing evenly, a mixed slurry is obtained, which is the finished product of the quartz stone waste road subgrade cushion material. The finished product of the quartz stone waste road subgrade cushion material is then transported to the road construction site for use.

8. The method for preparing a quartz stone waste road subgrade cushion material according to claim 7, characterized in that: The cement, sand and quartz stone mixed waste are poured into a concrete mixer and stirred at a rotation speed of 45 to 55 rpm for 20 to 25 minutes. The water and water permeable agent are added into the concrete mixer and stirred for 5 to 10 minutes.

9. The method for preparing a quartz stone waste road subgrade cushion material according to claim 7, characterized in that: The use of the finished quartz stone waste road subgrade cushion material at a road construction site comprises the following steps: S1. First, clean the existing roadbed at the road construction site, sweep the surface of the base with a broom, and sprinkle water to moisten it so that there is no water residue on the surface of the base; S2. Evenly spread the finished quartz stone waste road subgrade cushion material on the pavement base, compact the mixture, keep the surface of the subgrade cushion moist, and then naturally cure for 10 to 12 days.

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