Preparation process of anti-shrinkage and anti-cracking road water stable layer material containing slag
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANDONG UNIV
- Filing Date
- 2026-07-07
- Publication Date
- 2026-08-04
AI Technical Summary
[0005]针对上述的问题，本发明提供一种含有渣土的防干缩开裂型道路水稳层材料的制备工艺，其能够有效克服掺有渣土的路水稳层由于干缩开裂引发的承载能力下降的问题，促进了工程渣土在道路水稳层中的应用，有助于拓展工程渣土的应用场景，提升其利用率
本发明先采用再生混凝土微粉、月桂酰谷氨酸粉、氟硅酸镁粉对工程渣土进行改性，然后再用氨基硅烷和N,N,N-三甲基甘氨酸进一步改性形成防干缩开裂型渣土粉。将其作为较低水灰比的道路水稳层材料的原料时，一方面，在所述氨基硅烷和N,N,N-三甲基甘氨酸的作用下有效防止了渣土颗粒团聚。为此，本发明先将氨基硅烷上的氨基进行质子化，并在此过程中使氨基硅烷上的硅烷基水解后形成硅羟基，其可以与所述渣土颗粒表面的硅羟基缩合形成Si-O-Si键，从而在渣土颗粒表面牢固地负载质子化的氨基硅烷，然后本发明进一步利用N,N,N-三甲基甘氨酸改性处理后，所述渣土颗粒表面的质子化氨基与N,N,N-三甲基甘氨酸上的羧基吸附实现其负载的同时，N,N,N-三甲基甘氨酸在其另一端季铵阳离与所述质子化氨基的静电斥力下使N,N,N-三甲基甘氨酸向外伸展，从而在渣土颗粒表面构建空间位阻+阳离子屏蔽层，使渣土颗粒之间不易接触团聚，显著提升了其分散性，从而使渣土颗粒能够更加均匀地分布在道路水稳层材料的基体中，防止聚集形成更加容易开裂的薄弱区。另一方面，在道路水稳层材料水化硬化的中后期，本发明的所述防干缩开裂型渣土粉中的月桂酰谷氨酸与水泥水化产物氢氧化钙以及再生混凝土微粉提供的氢氧化钙反应后形成月桂酰谷氨钙和水分，不仅能够向体系中补充水分，再加上所述N,N,N-三甲基甘氨酸还能够抑制水分的蒸发，可以有效缓解干缩引起的开裂。同时，所述月桂酰谷氨钙还能够有效降低所述水分的表面张力，从而降低诱导干缩的毛细管压力，进一步缓解干缩引起的开裂。再一方面，所述防干缩开裂型渣土粉中的氟硅酸镁在所述氢氧化钙的碱性环境下分解后形成氟化钙、氢氧化镁、二氧化硅凝胶和水分（MgSiF6+Ca(OH)2→CaF2+Mg(OH)2+SiO2+H2O），不仅可向体系中补充水分缓解干缩引起的开裂，而且所述二氧化硅凝胶和水分被氢氧化钙转化为水化硅酸钙胶凝产物，其可以起到提升本发明道路水稳层材料基体强度的作用，同时，所述CaF2和Mg(OH)2还能够密实水化硅酸钙胶凝产物，有助于进一步提高本发明道路水稳层材料抵抗干缩开裂的能力。
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Abstract
Description
Technical Field
[0001] This invention relates to the field of building materials, specifically to a preparation process of a road water-stabilized layer material containing slag and soil that is resistant to drying shrinkage and cracking. Background Technology
[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.
[0003] Construction waste mainly refers to the excavated soil and materials generated during construction activities such as foundation pit excavation, site leveling, tunnel excavation, and roadbed excavation. With the continuous deepening of my country's new urbanization construction, the scale of construction projects in building, municipal, transportation, and water conservancy projects is constantly expanding, making construction waste the largest and most widely distributed type of urban solid waste. Construction waste has both environmental impact and resource attributes. Traditional waste disposal mainly involves open-air dumping and simple landfilling, which not only occupies a large amount of arable land and urban land but also easily leads to secondary disasters such as soil erosion, landslides, and collapses under rainfall conditions. Furthermore, the storage of waste also generates a large amount of dust, threatening the ecological environment and urban safety. At the same time, construction waste is also a recyclable resource that can be used for site backfilling, roadbed filling, landscaping soil, engineering subbase materials, roadbed materials, non-fired bricks, ecological slope protection blocks, and fluidized solidified soil, among other products.
[0004] The resource utilization of construction waste not only helps reduce the extraction of primary resources such as natural sand, gravel, and clay, but also reduces energy consumption and carbon emissions in building material production. Roadbed stabilized layers are structural layers between asphalt pavement and subgrade, requiring good load-bearing capacity. Adding construction waste to roadbed stabilized layers is one way to utilize them, enabling large-scale disposal. However, this also exacerbates the drying shrinkage of the roadbed stabilized layer, increasing the risk of cracking, especially when using roadbed stabilized layer materials with a lower water-cement ratio. This risk further increases, leading to a decrease in the load-bearing capacity of the roadbed stabilized layer and limiting the application of construction waste. Promoting the resource utilization of construction waste is a crucial step in achieving zero-waste city construction and driving the low-carbon transformation of the construction industry. Summary of the Invention
[0005] To address the aforementioned problems, this invention provides a preparation process for a road water-stabilized layer material containing construction waste that is resistant to drying shrinkage and cracking. This process effectively overcomes the problem of reduced load-bearing capacity caused by drying shrinkage and cracking in road water-stabilized layers containing construction waste, promotes the application of construction waste in road water-stabilized layers, helps expand the application scenarios of construction waste, and improves its utilization rate. Specifically, the technical solution of this invention is as follows.
[0006] A preparation process for a road water-stabilized layer material containing slag and preventing drying shrinkage and cracking includes the following steps: (1) The engineering slag powder, recycled concrete powder, lauroyl glutamic acid powder and magnesium fluorosilicate powder are mixed and ground to obtain slag-based composite powder.
[0007] (2) Add aminosilane to an ethanol aqueous solution and mix well. Then add acid solution and stir. After completion, mix the obtained protonated aminosilane solution with the slag-based composite powder, dry and grind to obtain modified slag powder.
[0008] (3) The modified slag powder is mixed with anhydrous ethanol containing saturated N,N,N-trimethylglycine and then dried to obtain slag powder that is resistant to drying shrinkage and cracking.
[0009] (4) Take the following components: cement, coarse aggregate, fine aggregate, the anti-drying shrinkage cracking type slag powder, and fiber. Mix the above components with mixing water to obtain the road water-stabilized layer material.
[0010] Further, in step (1), the mass ratio of the engineering slag powder, recycled concrete powder, lauroyl glutamic acid powder, and magnesium fluorosilicate powder is 100:25~32:8~11:3~5.
[0011] Furthermore, in step (1), the fineness of the slag-based composite powder is 200~400 mesh.
[0012] Furthermore, in step (2), the mass fraction of ethanol in the ethanol aqueous solution is 80-90%.
[0013] Further, in step (2), the acid solution is added to adjust the pH of the system to 4-5.5. Optionally, the acid solution includes at least one of hydrochloric acid, nitric acid, acetic acid, etc.
[0014] Furthermore, in step (2), the stirring time is 15~20 min.
[0015] Further, in step (2), the ratio of the slag-based composite powder to the protonated aminosilane solution is 1g: 0.5~0.7mL.
[0016] Further, in step (2), the mass fraction of aminosilane in the protonated aminosilane solution is 1-2%. Optionally, the aminosilane includes at least one of 3-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane.
[0017] Further, in step (2), the drying temperature is 60~70℃ and the time is 20~30min. Optionally, the fineness of the modified slag powder is 200~400 mesh.
[0018] Further, in step (3), the modified slag powder reacts with dissolved saturated N,N,N-trimethylglycine (C5H) 11 The ratio of anhydrous ethanol to NO2 is 1g: 0.9~1.2mL.
[0019] Furthermore, in step (3), the drying temperature is 60~70℃ and the time is 30~40min.
[0020] Further, in step (4), the proportions of each component are: 38-45 parts by weight of cement, 400-480 parts by weight of coarse aggregate, 210-260 parts by weight of fine aggregate, 45-55 parts by weight of anti-drying shrinkage cracking slag powder, 3-6 parts by weight of fiber, and 48-59 parts by weight of mixing water.
[0021] Further, in step (4), the fiber includes at least one of polyethylene fiber, polypropylene fiber, polyvinyl alcohol fiber, etc. Optionally, the length of the fiber is 10~20mm.
[0022] Compared with the prior art, the present invention has at least the following beneficial technical effects: This invention first modifies engineering waste soil using recycled concrete micro powder, lauroyl glutamic acid powder, and magnesium fluorosilicate powder, and then further modifies it with aminosilane and N,N,N-trimethylglycine to form a waste soil powder resistant to drying shrinkage and cracking. When used as a raw material for road water-stabilized layer materials with a low water-cement ratio, the aminosilane and N,N,N-trimethylglycine effectively prevent the agglomeration of waste soil particles. To this end, the present invention first protonates the amino group on the aminosilane, and in the process, hydrolyzes the silane group on the aminosilane to form silanol groups, which can condense with the silanol groups on the surface of the slag particles to form Si-O-Si bonds, thereby firmly loading the protonated aminosilane on the surface of the slag particles. Then, the present invention further utilizes N,N,N-trimethylglycine for modification treatment. At the same time, the protonated amino group on the surface of the slag particles is adsorbed with the carboxyl group on N,N,N-trimethylglycine to achieve its loading. Under the electrostatic repulsion between the quaternary ammonium cation at the other end of N,N,N-trimethylglycine and the protonated amino group, N,N,N-trimethylglycine extends outward, thereby constructing a steric hindrance + cation shielding layer on the surface of the slag particles. This makes it difficult for the slag particles to contact and agglomerate, significantly improving their dispersibility. As a result, the slag particles can be more evenly distributed in the matrix of the road water-stabilized layer material, preventing the formation of weak areas that are more prone to cracking. On the other hand, in the middle and late stages of hydration and hardening of road water-stabilized layer materials, the lauroyl glutamic acid in the anti-drying-shrinkage cracking slag powder of the present invention reacts with calcium hydroxide (a cement hydration product) and calcium hydroxide provided by recycled concrete micropowder to form lauroyl glutamic acid calcium and water. This not only replenishes the water in the system, but also, in addition, the N,N,N-trimethylglycine inhibits water evaporation, effectively alleviating cracking caused by drying shrinkage. Simultaneously, the lauroyl glutamic acid calcium effectively reduces the surface tension of the water, thereby reducing the capillary pressure that induces drying shrinkage and further alleviating cracking caused by drying shrinkage. On the other hand, the magnesium fluorosilicate in the anti-drying shrinkage cracking type slag powder decomposes in the alkaline environment of the calcium hydroxide to form calcium fluoride, magnesium hydroxide, silica gel and water (MgSiF6+Ca(OH)2→CaF2+Mg(OH)2+SiO2+H2O). This not only replenishes the water in the system to alleviate cracking caused by drying shrinkage, but also the silica gel and water are converted into calcium silicate hydrate cementitious products by calcium hydroxide, which can improve the matrix strength of the road water-stabilized layer material of the present invention. At the same time, the CaF2 and Mg(OH)2 can also compact the calcium silicate hydrate cementitious products, which helps to further improve the ability of the road water-stabilized layer material of the present invention to resist drying shrinkage cracking. Attached Figure Description
[0023] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Hereinafter, embodiments of the invention will be described in detail with reference to the accompanying drawings, wherein: Figure 1 The image shows a sample of the anti-drying shrinkage cracking type slag powder prepared in Example 1 below.
[0024] Figure 2 The image shows a sample of the anti-drying shrinkage cracking slag powder prepared in Example 2 below.
[0025] Figure 3 The image shows a sample of the anti-drying shrinkage cracking type slag powder prepared in Example 3 below.
[0026] Figure 4 The image shows a sample of the anti-drying shrinkage cracking type slag powder prepared in Example 4 below.
[0027] Figure 5 The image shows a sample of the anti-drying shrinkage cracking type slag powder prepared in Example 5 below.
[0028] Figure 6 The image shows a sample of the slag-based composite powder prepared in Example 6 below.
[0029] Figure 7 The image shows a sample of the anti-drying shrinkage cracking type slag powder prepared in Example 7 below. Detailed Implementation
[0030] The present invention is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer.
[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of skill in the art. The reagents and raw materials used in this invention are readily available through conventional means, and unless otherwise specified, they shall be used in accordance with conventional methods in the art or as per the product instructions. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to the methods of this invention.
[0032] Example 1 A preparation process for a road water-stabilized layer material containing slag and preventing drying shrinkage and cracking includes the following steps: (1) Mix the engineering slag powder, recycled concrete powder, lauroyl glutamic acid powder and magnesium fluorosilicate powder in a mass ratio of 100:30:10:4 and grind them. Then pass them through a 200-mesh sieve to obtain slag-based composite powder for later use.
[0033] (2) Add aminosilane (3-aminopropyltriethoxysilane) to an 85% ethanol aqueous solution and stir until homogeneous. Then add acetic acid to adjust the pH of the system to 5 and stir continuously for 20 min to obtain a protonated aminosilane solution, wherein the mass fraction of aminosilane is 1.5%. Then spray the protonated aminosilane solution onto the slag-based composite powder at a ratio of 1 g: 0.6 mL under stirring conditions. After completion, continue stirring for 10 min, then dry in an oven at 70°C for 20 min, grind and pass through a 200-mesh sieve to obtain modified slag powder for later use.
[0034] (3) Spray anhydrous ethanol containing saturated N,N,N-trimethylglycine into the modified slag powder at a ratio of 1g:1mL under stirring conditions. After stirring for 20min, dry in an oven at 70℃ for 30min to obtain slag powder resistant to drying shrinkage and cracking (e.g., ...). Figure 1 (As shown), for later use.
[0035] (4) Take the following components in the following proportions: 43 parts by weight of 42.5 ordinary Portland cement, 450 parts by weight of coarse aggregate, 240 parts by weight of fine aggregate, 52 parts by weight of the anti-drying shrinkage cracking slag powder of this embodiment, and 4 parts by weight of polyethylene fiber. Wherein, the coarse aggregate is crushed stone with a particle size distribution between 10 and 20 mm, the fine aggregate is river sand with a particle size distribution between 0.5 and 2 mm, and the fiber length is 15 mm. Add the above components to a mixer and dry mix for 3 minutes, then add 55 parts by weight of mixing water and continue mixing for 2 minutes to obtain the road water-stabilized layer material.
[0036] Performance testing: (1) The 28-day unconfined compressive strength of the road water-stabilized layer material prepared in this embodiment was tested according to the "Test Procedure for Inorganic Binder Stabilized Materials in Highway Engineering" (JTG 3441-2024). (2) The shrinkage rate of the road water-stabilized layer material was tested according to the "Test Method for Drying Shrinkage Cracking Performance of Cement Mortar and Concrete" (GB / T 29417-2012). The results were: compressive strength = 9.41 MPa, shrinkage rate = 2.26 × 10⁻⁶ MPa. -5 .
[0037] Example 2 A preparation process for a road water-stabilized layer material containing slag and preventing drying shrinkage and cracking includes the following steps: (1) Mix the engineering slag powder, recycled concrete powder, lauroyl glutamic acid powder and magnesium fluorosilicate powder in a mass ratio of 100:25:8:3 and grind them. Then pass them through a 400-mesh sieve to obtain slag-based composite powder for later use.
[0038] (2) Add aminosilane (γ-aminopropyltrimethoxysilane) to a 90% ethanol aqueous solution and stir until homogeneous. Then add hydrochloric acid to adjust the pH of the system to 5.5 and stir continuously for 20 min to obtain a protonated aminosilane solution, wherein the mass fraction of aminosilane is 2%. Then spray the protonated aminosilane solution onto the slag-based composite powder at a ratio of 1 g: 0.5 mL under stirring conditions. After completion, continue stirring for 10 min, then dry in an oven at 60°C for 30 min, grind and pass through a 400-mesh sieve to obtain modified slag powder for later use.
[0039] (3) At a ratio of 1g:0.9mL, anhydrous ethanol containing saturated N,N,N-trimethylglycine was sprayed onto the modified slag powder under stirring conditions. After stirring, the mixture was stirred for 20min, and then dried in an oven at 60℃ for 40min to obtain slag powder resistant to drying shrinkage and cracking (e.g. Figure 2 (As shown), for later use.
[0040] (4) Take the following components in the following proportions: 45 parts by weight of 42.5 ordinary Portland cement, 480 parts by weight of coarse aggregate, 260 parts by weight of fine aggregate, 55 parts by weight of the anti-drying shrinkage cracking slag powder of this embodiment, and 6 parts by weight of polypropylene fiber. Wherein, the coarse aggregate is crushed stone with a particle size distribution between 10 and 20 mm, the fine aggregate is river sand with a particle size distribution between 0.5 and 2 mm, and the fiber length is 20 mm. Add the above components to a mixer and dry mix for 3 minutes, then add 59 parts by weight of mixing water and continue mixing for 2 minutes to obtain the road water-stabilized layer material.
[0041] Performance testing: The 28-day unconfined compressive strength and shrinkage rate of the road water-stabilized layer material prepared in this embodiment were tested using the same method as in Example 1 above. The results were: compressive strength = 9.87 MPa, shrinkage rate = 1.94 × 10⁻⁶ MPa. -5 .
[0042] Example 3 A preparation process for a road water-stabilized layer material containing slag and preventing drying shrinkage and cracking includes the following steps: (1) Mix engineering slag powder, recycled concrete powder, lauroyl glutamic acid powder and magnesium fluorosilicate powder in a mass ratio of 100:32:11:5 and grind them. Then pass them through a 300-mesh sieve to obtain slag-based composite powder for later use.
[0043] (2) Add aminosilane (N-(2-aminoethyl)-3-aminopropyltrimethoxysilane) to an 80% ethanol aqueous solution and stir until homogeneous. Then add hydrochloric acid to adjust the pH of the system to 4 and stir continuously for 15 min to obtain a protonated aminosilane solution, wherein the mass fraction of aminosilane is 1.0%. Then spray the protonated aminosilane solution onto the slag-based composite powder at a ratio of 1 g: 0.7 mL under stirring conditions. After completion, continue stirring for 10 min, then dry in an oven at 65°C for 25 min, grind and pass through a 300-mesh sieve to obtain modified slag powder for later use.
[0044] (3) At a ratio of 1g:1.2mL, anhydrous ethanol containing saturated N,N,N-trimethylglycine was sprayed onto the modified slag powder under stirring conditions. After stirring, the mixture was stirred for 20min, and then dried in an oven at 70℃ for 40min to obtain slag powder resistant to drying shrinkage and cracking (e.g. Figure 3 (As shown), for later use.
[0045] (4) Take the following components in the following proportions: 38 parts by weight of 42.5 ordinary Portland cement, 400 parts by weight of coarse aggregate, 210 parts by weight of fine aggregate, 45 parts by weight of the anti-drying shrinkage cracking slag powder of this embodiment, and 3 parts by weight of polyethylene fiber. Wherein, the coarse aggregate is crushed stone with a particle size distribution between 10 and 20 mm, the fine aggregate is river sand with a particle size distribution between 0.5 and 2 mm, and the fiber length is 10 mm. Add the above components to a mixer and dry mix for 3 minutes, then add 48 parts by weight of mixing water and continue mixing for 2 minutes to obtain the road water-stabilized layer material.
[0046] Performance testing: The 28-day unconfined compressive strength and shrinkage rate of the road water-stabilized layer material prepared in this embodiment were tested using the same method as in Example 1 above. The results were: compressive strength = 8.91 MPa, shrinkage rate = 2.58 × 10⁻⁶ MPa. -5 .
[0047] Example 4 A preparation process for a road water-stabilized layer material containing slag and preventing drying shrinkage and cracking includes the following steps: (1) Mix the engineering slag powder, recycled concrete powder and magnesium fluorosilicate powder in a mass ratio of 100:30:4 and grind them. Then pass them through a 200-mesh sieve to obtain slag-based composite powder for later use.
[0048] (2) Add aminosilane (3-aminopropyltriethoxysilane) to an 85% ethanol aqueous solution and stir until homogeneous. Then add acetic acid to adjust the pH of the system to 5 and stir continuously for 20 min to obtain a protonated aminosilane solution, wherein the mass fraction of aminosilane is 1.5%. Then spray the protonated aminosilane solution onto the slag-based composite powder at a ratio of 1 g: 0.6 mL under stirring conditions. After completion, continue stirring for 10 min, then dry in an oven at 70°C for 20 min, grind and pass through a 200-mesh sieve to obtain modified slag powder for later use.
[0049] (3) Spray anhydrous ethanol containing saturated N,N,N-trimethylglycine into the modified slag powder at a ratio of 1g:1mL under stirring conditions. After stirring for 20min, dry in an oven at 70℃ for 30min to obtain slag powder resistant to drying shrinkage and cracking (e.g., ...). Figure 4 (As shown), for later use.
[0050] (4) Take the following components in the following proportions: 43 parts by weight of 42.5 ordinary Portland cement, 450 parts by weight of coarse aggregate, 240 parts by weight of fine aggregate, 52 parts by weight of the anti-drying shrinkage cracking slag powder of this embodiment, and 4 parts by weight of polyethylene fiber. Wherein, the coarse aggregate is crushed stone with a particle size distribution between 10 and 20 mm, the fine aggregate is river sand with a particle size distribution between 0.5 and 2 mm, and the fiber length is 15 mm. Add the above components to a mixer and dry mix for 3 minutes, then add 55 parts by weight of mixing water and continue mixing for 2 minutes to obtain the road water-stabilized layer material.
[0051] Performance testing: The 28-day unconfined compressive strength and shrinkage rate of the road water-stabilized layer material prepared in this embodiment were tested using the same method as in Example 1 above. The results were: compressive strength = 8.22 MPa, shrinkage rate = 5.69 × 10⁻⁶ MPa. -5 .
[0052] Example 5 A preparation process for a road water-stabilized layer material containing slag and preventing drying shrinkage and cracking includes the following steps: (1) Mix engineering slag powder, recycled concrete powder and lauroyl glutamic acid powder in a mass ratio of 100:25:8 and grind them. Then pass them through a 400-mesh sieve to obtain slag-based composite powder for later use.
[0053] (2) Add aminosilane (γ-aminopropyltrimethoxysilane) to a 90% ethanol aqueous solution and stir until homogeneous. Then add hydrochloric acid to adjust the pH of the system to 5.5 and stir continuously for 20 min to obtain a protonated aminosilane solution, wherein the mass fraction of aminosilane is 2%. Then spray the protonated aminosilane solution onto the slag-based composite powder at a ratio of 1 g: 0.5 mL under stirring conditions. After completion, continue stirring for 10 min, then dry in an oven at 60°C for 30 min, grind and pass through a 400-mesh sieve to obtain modified slag powder for later use.
[0054] (3) At a ratio of 1g:0.9mL, anhydrous ethanol containing saturated N,N,N-trimethylglycine was sprayed onto the modified slag powder under stirring conditions. After stirring, the mixture was stirred for 20min, and then dried in an oven at 60℃ for 40min to obtain slag powder resistant to drying shrinkage and cracking (e.g. Figure 5 (As shown), for later use.
[0055] (4) Take the following components in the following proportions: 45 parts by weight of 42.5 ordinary Portland cement, 480 parts by weight of coarse aggregate, 260 parts by weight of fine aggregate, 55 parts by weight of the anti-drying shrinkage cracking slag powder of this embodiment, and 6 parts by weight of polypropylene fiber. Wherein, the coarse aggregate is crushed stone with a particle size distribution between 10 and 20 mm, the fine aggregate is river sand with a particle size distribution between 0.5 and 2 mm, and the fiber length is 20 mm. Add the above components to a mixer and dry mix for 3 minutes, then add 59 parts by weight of mixing water and continue mixing for 2 minutes to obtain the road water-stabilized layer material.
[0056] Performance testing: The 28-day unconfined compressive strength and shrinkage rate of the road water-stabilized layer material prepared in this embodiment were tested using the same method as in Example 1 above. The results were: compressive strength = 8.54 MPa, shrinkage rate = 4.71 × 10⁻⁶ MPa. -5 .
[0057] Example 6 A preparation process for a road water-stabilized layer material containing slag and preventing drying shrinkage and cracking includes the following steps: (1) Engineering slag powder, recycled concrete powder, lauroyl glutamic acid powder, and magnesium fluorosilicate powder are mixed in a mass ratio of 100:30:10:4 and then ground. The mixture is then passed through a 200-mesh sieve to obtain slag-based composite powder (e.g., Figure 6 (As shown), for later use.
[0058] (2) Take the following components in the following proportions: 43 parts by weight of 42.5 ordinary Portland cement, 450 parts by weight of coarse aggregate, 240 parts by weight of fine aggregate, 52 parts by weight of the slag-based composite powder of this embodiment, and 4 parts by weight of polyethylene fiber. Wherein, the coarse aggregate is crushed stone with a particle size distribution between 10 and 20 mm, the fine aggregate is river sand with a particle size distribution between 0.5 and 2 mm, and the fiber length is 15 mm. Add the above components to a mixer and dry mix for 3 minutes, then add 55 parts by weight of mixing water and continue mixing for 2 minutes to obtain the road water-stabilized layer material.
[0059] Performance testing: The 28-day unconfined compressive strength and shrinkage rate of the road water-stabilized layer material prepared in this embodiment were tested using the same method as in Example 1 above. The results were: compressive strength = 8.37 MPa, shrinkage rate = 5.16 × 10⁻⁶ MPa. -5 .
[0060] Example 7 A preparation process for a road water-stabilized layer material containing slag and preventing drying shrinkage and cracking includes the following steps: (1) Mix engineering slag powder, recycled concrete powder, lauroyl glutamic acid powder and magnesium fluorosilicate powder in a mass ratio of 100:32:11:5 and grind them. Then pass them through a 300-mesh sieve to obtain slag-based composite powder for later use.
[0061] (2) Add aminosilane (N-(2-aminoethyl)-3-aminopropyltrimethoxysilane) to an 80% ethanol aqueous solution and stir until homogeneous to obtain an aminosilane solution, wherein the mass fraction of aminosilane is 1.0%. Then, spray the aminosilane solution onto the slag-based composite powder at a ratio of 1g:0.7mL under stirring conditions. After completion, continue stirring for 10min, then dry in an oven at 65℃ for 25min, grind and pass through a 300-mesh sieve to obtain modified slag powder for later use.
[0062] (3) At a ratio of 1g:1.2mL, anhydrous ethanol containing saturated N,N,N-trimethylglycine was sprayed onto the modified slag powder under stirring conditions. After stirring, the mixture was stirred for 20min, and then dried in an oven at 70℃ for 40min to obtain slag powder resistant to drying shrinkage and cracking (e.g. Figure 7 (As shown), for later use.
[0063] (4) Take the following components in the following proportions: 38 parts by weight of 42.5 ordinary Portland cement, 400 parts by weight of coarse aggregate, 210 parts by weight of fine aggregate, 45 parts by weight of the anti-drying shrinkage cracking slag powder of this embodiment, and 3 parts by weight of polyethylene fiber. Wherein, the coarse aggregate is crushed stone with a particle size distribution between 10 and 20 mm, the fine aggregate is river sand with a particle size distribution between 0.5 and 2 mm, and the fiber length is 10 mm. Add the above components to a mixer and dry mix for 3 minutes, then add 48 parts by weight of mixing water and continue mixing for 2 minutes to obtain the road water-stabilized layer material.
[0064] Performance testing: The 28-day unconfined compressive strength and shrinkage rate of the road water-stabilized layer material prepared in this embodiment were tested using the same method as in Example 1 above. The results were: compressive strength = 8.11 MPa, shrinkage rate = 4.03 × 10⁻⁶ MPa. -5 .
[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A preparation process for a road water-stabilized layer material containing slag and soil that is resistant to drying shrinkage and cracking, characterized in that, Includes the following steps: (1) Engineering slag powder, recycled concrete powder, lauroyl glutamic acid powder and magnesium fluorosilicate powder are mixed in a mass ratio of 100:25~32:8~11:3~5 and then ground to obtain slag-based composite powder; (2) Add aminosilane to an ethanol aqueous solution and mix well. Then add acid solution and stir. After completion, mix the protonated aminosilane solution with the slag-based composite powder, dry and grind to obtain modified slag powder. (3) The modified slag powder is mixed with anhydrous ethanol containing saturated N,N,N-trimethylglycine at a ratio of 1g:0.9~1.2mL and then dried to obtain slag powder that is resistant to drying shrinkage and cracking. (4) Take the following components in the following proportions: 38-45 parts by weight of cement, 400-480 parts by weight of coarse aggregate, 210-260 parts by weight of fine aggregate, 45-55 parts by weight of the anti-drying shrinkage and cracking slag powder, and 3-6 parts by weight of fiber; mix the above components with 48-59 parts by weight of water to obtain the road water-stabilized layer material.
2. The preparation process of the anti-drying shrinkage cracking road water-stabilized layer material containing slag as described in claim 1, characterized in that, In step (1), the fineness of the slag-based composite powder is 200~400 mesh.
3. The preparation process of the anti-drying shrinkage cracking road water-stabilized layer material containing slag as described in claim 1, characterized in that, In step (2), the mass fraction of ethanol in the aqueous ethanol solution is 80-90%; or, in step (2), the acid solution is added to adjust the pH of the system to 4-5.
5.
4. The preparation process of the anti-drying shrinkage cracking road water-stabilized layer material containing slag as described in claim 1, characterized in that, In step (2), the acid solution includes at least one of hydrochloric acid, nitric acid, and acetic acid; or, in step (2), the stirring time is 15-20 min.
5. The preparation process of the anti-drying shrinkage cracking road water-stabilized layer material containing slag as described in claim 1, characterized in that, In step (2), the ratio of the slag-based composite powder to the protonated aminosilane solution is 1g: 0.5~0.7mL.
6. The preparation process of the anti-drying shrinkage cracking road water-stabilized layer material containing slag as described in claim 1, characterized in that, In step (2), the mass fraction of aminosilane in the protonated aminosilane solution is 1-2%.
7. The preparation process of the anti-drying shrinkage cracking road water-stabilized layer material containing slag as described in claim 1, characterized in that, In step (2), the aminosilane includes at least one of 3-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane; Alternatively, in step (2), the drying temperature is 60~70℃ and the time is 20~30min; Alternatively, in step (2), the fineness of the modified slag powder is 200~400 mesh.
8. The preparation process of the anti-drying shrinkage cracking road water-stabilized layer material containing slag as described in claim 1, characterized in that, In step (3), the drying temperature is 60~70℃ and the time is 30~40min.
9. The preparation process of the anti-drying shrinkage cracking road water-stabilized layer material containing slag as described in any one of claims 1-8, characterized in that, In step (4), the fiber includes at least one of polyethylene fiber, polypropylene fiber, and polyvinyl alcohol fiber.
10. The preparation process of the anti-drying shrinkage cracking road water-stabilized layer material containing slag as described in any one of claims 1-8, characterized in that, In step (4), the length of the fiber is 10~20mm.