Road edge stone based on solid waste and preparation process

Abstract

The invention discloses a road edge stone based on solid waste and a preparation process thereof, and the road edge stone is prepared by using coarse aggregate and fine aggregate prepared from building waste clay bricks, concrete, slag, coal gangue and the like to replace natural aggregate, using a cementing material prepared from waste such as waste concrete, fly ash, desulfurized gypsum, red mud and the like, and matching with solid waste cement, water, a water reducing agent, an additive and the like. The preparation method has the advantages that the prepared road edge stone effectively utilizes effective components of the construction waste and the solid waste material, so that resources are saved, and resource recycling of the construction waste is realized; the prepared road edge stone has the effects of protecting the environment and protecting the road, and meets the environmental protection strategy, the building energy-saving policy and the development requirements of the new material industry.

Description

Technical Field

[0001] The present application belongs to the field of multifunctional building materials, and specifically relates to solid waste-based kerbstones and preparation processes. Background Art

[0002] With the acceleration of industrialization and the continuous advancement of urbanization, the amount of solid waste generated has increased dramatically. The accumulation of industrial waste, construction waste, tailings and other solid wastes not only occupies precious land resources, but also causes serious pollution to the environment. Therefore, how to effectively treat and utilize these solid wastes has become an important issue currently faced.

[0003] As an important auxiliary facility in road engineering, curbstones are in huge demand. Traditional curbstones are mainly made of natural stone or concrete. However, the mining of natural stone will damage the mountain, affect the ecological environment, and the resources are limited; although the cost of concrete curbstones is relatively low, a large amount of cement, sand and gravel and other resources are consumed during the production process, and certain environmental pollution will also be generated. In addition, the preparation method of traditional curbstones often has problems such as high energy consumption and complex process.

[0004] Multi-component solid waste contains a large number of usable components, such as silicon, aluminum, calcium and other elements in industrial waste, sand, gravel, cement blocks and other components in construction waste, and mineral components in tailings. Through reasonable technical means, these solid wastes can be treated and processed to produce curbstones with excellent performance. At the same time, the comprehensive utilization of multi-component solid wastes can also achieve the recycling of resources and reduce the negative impact on the environment. Based on this, the present application proposes a curbstone preparation process based on solid waste. Summary of the invention

[0005] The purpose of the present invention is to provide a solid waste-based curbstone and a preparation process to address the deficiencies in the prior art. The curbstone is prepared using raw materials such as industrial waste slag and construction waste through optimized design ratios and process flow and has the advantages of high strength, good compression and wear resistance, and good aging resistance.

[0006] The embodiment of the present application discloses a solid waste-based curbstone, whose raw materials include cementitious materials, aggregates, and admixtures. The cementitious materials include: waste concrete, fly ash, desulfurized gypsum, red mud, slag, and cement; the aggregates include waste concrete, waste clay bricks, steel slag, nickel slag, and coal gangue; the admixtures are water reducers and early strength agents.

[0007] The present invention also provides a process for preparing kerbstone based on solid waste, comprising the following steps: S1. Aggregate preparation: crushing and screening waste clay bricks, waste clay bricks, steel slag, nickel slag and coal gangue respectively to obtain continuously graded fragments with a particle size of 5 to 30 mm, wherein the ratio of fine bone to coarse bone is 60:40 to 70:30, washing and drying; S2 Preparation of cementitious materials: crushing and grinding waste concrete, fly ash, desulfurized gypsum, red mud and slag respectively, mixing with cement in a mixer after proportioning; S3 Preparation of kerbstones: Weigh water, water reducing agent and early strength agent in proportion and mix them evenly. Continue to weigh cementitious materials and aggregates in proportion, stir the above materials by low-speed rotation, fill and shape, and cure the test blocks.

[0008] Preferably, the cement is one of C42.5 nickel slag silicate cement, steel slag silicate cement and pozzolanic silicate cement.

[0009] Preferably, the proportion of the cementitious material in step S1 is 20-30% of waste concrete, 20-30% of fly ash, 8-12% of desulfurized gypsum, 2-5% of red mud, 5-8% of slag, and 30-40% of cement.

[0010] Preferably, in step S2, the amounts of cementitious material and aggregate added are 10-15% and 70-95% respectively, the amount of admixture added is 1-3% of the cementitious material, and the water-cement ratio is 0.3-0.5.

[0011] Preferably, the curing conditions in step S3 are: temperature 20°C±2°C, relative humidity above 95%RH.

[0012] Compared with the prior art, the present invention has the following benefits: 1. The present invention processes construction waste into recycled aggregates. By optimizing the proportion of each material and the process flow, the prepared kerbstone has the advantages of good compressive strength, durability, water permeability, stability, impact resistance, etc., and can also realize resource recycling; 2. The curbstone provided by the present invention is prepared by using solid waste such as discarded clay bricks, discarded concrete, steel slag, etc., which can handle a large amount of construction waste while saving resources, reducing energy consumption and costs, and protecting the environment. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present invention are described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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. Example 1

[0014] S1. Aggregate preparation: waste concrete, waste clay bricks, steel slag, nickel slag and coal gangue are crushed and sieved respectively to obtain continuously graded fragments with a particle size of 5 to 30 mm, wherein the ratio of fine bone to coarse bone is 60:40, and then washed and dried; S2 Preparation of cementitious materials: crush and grind the waste concrete into a specific surface area of ​​about 700m 2 / kg powder, the slag is processed into a specific surface area of ​​about 350m 2 / kg powder, waste concrete powder, fly ash, desulfurized gypsum, red mud, slag, C42.5 steel slag silicate cement are mixed in a ratio of 25:20:10:4:6:35, and mixed evenly in a mixer; S3 Preparation of kerbstones: weigh 3.75 parts of water, 1 part of water reducing agent, and 1 part of early strength agent and mix them evenly. Continue to weigh 10 parts of cementitious materials mixed in step S2 and 80 parts of aggregates prepared in S1, stir at low speed for not less than 5 minutes, fill and vibrate to form.

[0015] The formed test blocks are placed in a standard curing room for curing and molding, and performance tests are carried out at appropriate ages. Example 2

[0016] S1. Aggregate preparation: waste concrete, waste clay bricks, steel slag, nickel slag and coal gangue are crushed and sieved respectively to obtain continuously graded fragments with a particle size of 5 to 30 mm, wherein the ratio of fine bone to coarse bone is 70:30, and then washed and dried; S2 Preparation of cementitious materials: crush and grind the waste concrete into a specific surface area of ​​about 700m 2 / kg powder, the slag is processed into a specific surface area of ​​about 350m 2 / kg powder, waste concrete powder, fly ash, desulfurized gypsum, red mud, slag, C42.5 steel slag silicate cement are mixed in a ratio of 20:25:12:5:8:35, and mixed evenly in a mixer; S3 Preparation of kerbstones: weigh 4.2 parts of water, 1 part of water reducing agent, and 1 part of early strength agent, and mix them evenly. Continue to weigh 12 parts of cementitious materials mixed in S2 and 90 parts of aggregates prepared in S1, and stir them at a low speed for not less than 5 minutes. Fill and vibrate to form them; put the formed test blocks into a standard curing room for curing and forming, and conduct performance tests at the appropriate age. Example 3

[0017] S1. Aggregate preparation: waste concrete, waste clay bricks, steel slag, nickel slag and coal gangue are crushed and sieved respectively to obtain continuously graded fragments with a particle size of 5 to 30 mm, wherein the ratio of fine bone to coarse bone is 60:40, and then washed and dried; S2 Preparation of cementitious materials: crush and grind the waste concrete into a specific surface area of ​​about 700m 2 / kg powder, the slag is processed into a specific surface area of ​​about 350m 2 / kg powder, waste concrete powder, fly ash, desulfurized gypsum, red mud, slag, C42.5 steel slag silicate cement are mixed in a ratio of 25:30:8:2:5:30, and mixed evenly in a mixer; S3 preparation of kerbstones: weigh 6 parts of water, 1.5 parts of water reducing agent, 1.2 parts of early strength agent and mix them evenly, then weigh 15 parts of cementitious material mixed in S2 and 115 parts of aggregate prepared in S1, stir at low speed for not less than 5 minutes, fill and vibrate to form; put the formed test blocks into a standard curing room for curing and forming, and conduct performance tests at the appropriate age. Example 4

[0018] S1. Aggregate preparation: waste concrete, waste clay bricks, steel slag, nickel slag and coal gangue are crushed and sieved respectively to obtain continuously graded fragments with a particle size of 5 to 30 mm, with a fine bone to coarse bone ratio of 60:40, and then washed and dried; S2 Preparation of cementitious materials: crush and grind the waste concrete into a specific surface area of ​​about 700m 2 / kg powder, the slag is processed into a specific surface area of ​​about 350m 2 / kg powder, waste concrete powder, fly ash, desulfurized gypsum, red mud, slag, C42.5 steel slag silicate cement are mixed in a ratio of 30:20:10:5:5:30, and mixed evenly in a mixer; S3 preparation of kerbstones: weigh 6.75 parts of water, 2 parts of water reducing agent, 1.5 parts of early strength agent and mix them evenly, then weigh 15 parts of cementitious material mixed in S2 and 120 parts of aggregate prepared in S1, stir at low speed for not less than 5 minutes, fill and vibrate to form; put the formed test blocks into a standard curing room for curing and forming, and conduct performance tests at the appropriate age. Example 5

[0019] S1. Aggregate preparation: waste concrete, waste clay bricks, steel slag, nickel slag and coal gangue are crushed and sieved respectively to obtain continuously graded fragments with a particle size of 5 to 30 mm, with a fine bone to coarse bone ratio of 60:40, and then washed and dried; S2 Preparation of cementitious materials: crush and grind the waste concrete into a specific surface area of ​​about 700m 2 / kg of powder, and the slag is processed into a specific surface area of ​​about 350m 2 / kg of powder, waste concrete powder, fly ash, desulfurized gypsum, red mud, slag, C42.5 steel slag silicate cement are mixed in a ratio of 20:25:8:2:5:40, and mixed evenly in a mixer; S3 preparation of kerbstones: weigh 5.6 parts of water, 1.5 parts of water reducing agent, 1 part of early strength agent and mix them evenly, then weigh 15 parts of cementitious material mixed in S2 and 115 parts of aggregate prepared in S1, stir at low speed for not less than 5 minutes, fill and vibrate to form; put the formed test blocks into a standard curing room for curing and forming, and conduct performance tests at the appropriate age.

[0020] Performance test: The performance of the kerbstones prepared in Examples 1-5 was tested, and the results are shown in the following table: Test items 28d compressive strength / MPa 28d flexural strength / MPa Water absorption / % Example 1 42.7 4.0 5.7 Example 2 45.5 4.2 5.9 Example 3 47.6 4.6 6.1 Example 4 46.3 4.3 6.0 Example 5 48.8 4.8 6.2 This implementation mode is only an exemplary description of this patent and does not limit its protection scope. Personnel in this field may also make partial changes to it. As long as it does not exceed the spirit of this patent, it shall be regarded as an equivalent replacement of this patent and shall be within the protection scope of this patent.

Claims

1. Curbstone based on solid waste, characterized in that: Raw materials include Cementitious materials, including waste concrete, fly ash, desulfurized gypsum, red mud, slag and cement; Aggregates, including waste concrete, waste clay bricks, steel slag, nickel slag and coal gangue; Admixtures, wherein the admixtures are water reducing agent and early strength agent.

2. The kerbstone according to claim 1, characterized in that: The cement is C42.5 nickel slag silicate cement, steel slag silicate cement or pozzolanic silicate cement.

3. The process for preparing kerbstone according to claim 1, characterized in that The following steps are involved: (1) Preparation of cementitious materials and aggregates; (2) Weigh aggregate, cementitious material, admixture and water in proportion; (3) Use low-speed rotation to stir, fill, shape and cure the materials.

4. The process for preparing kerbstone according to claim 3, characterized in that The preparation process of the aggregate is as follows: waste clay bricks, waste clay bricks, steel slag, nickel slag and coal gangue are crushed and screened respectively to obtain continuously graded fragments with a particle size of 5 to 30 mm, wherein the ratio of fine bone to coarse bone is 60:40 to 70:30, and then washed and dried.

5. The process for preparing kerbstone according to claim 3, characterized in that: The preparation process of the cementitious material is as follows: waste concrete, fly ash, desulfurized gypsum, red mud and slag are crushed and ground respectively, and then mixed with cement in a mixer after proportioning.

6. The process for preparing kerbstone according to claim 3, characterized in that: The proportion of the cementitious material in step (1) is 20-30% of waste concrete, 20-30% of fly ash, 8-12% of desulfurized gypsum, 2-5% of red mud, 5-8% of slag and 30-40% of cement.

7. The process for preparing kerbstone according to claim 3, characterized in that: In the step (2), the amounts of cementitious material and aggregate added are 10-15% and 70-95% respectively, the amount of admixture added is 1-3% of the cementitious material, and the water-cement ratio is 0.3-0.

5.

8. The process for preparing kerbstone according to claim 3, characterized in that: The curing conditions in step (3) are: temperature 20°C ± 2°C, relative humidity above 95%RH.