Cavernous slag stone powder-based concrete slurry admixture and preparation method thereof
The preparation of slag powder-based concrete paste admixtures has solved the problems of poor dispersibility and low activity of slag powder in concrete, realizing the efficient resource utilization of concrete and improving the stability and strength of concrete.
Patent Information
- Application Number
- CN202511039753.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-28
- Publication Date
- 2025-10-17
AI Technical Summary
Tunnel slag powder has poor dispersibility and low activity in concrete, which leads to unstable concrete performance and makes it difficult to fully exert its filling and gelling effect in concrete.
A highly dispersed modified slurry admixture is prepared by uniformly mixing slag powder-based concrete slurry admixture, which includes slag powder, dispersant (attapulgite and anionic polyacrylamide), stone powder reinforcing agent (carbonate, sulfate and nano silica), and water-reducing agent (high-efficiency polycarboxylate water-reducing agent).
It improves the dispersibility and activity of slag stone powder in concrete, improves the stability and strength of concrete, reduces cement consumption, and enhances the durability of concrete.
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Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of concrete materials, and particularly relates to a hole slag stone powder-based concrete paste admixture and a preparation method thereof. BACKGROUND
[0002] With the development of basic transportation construction, a large amount of crushed stone is produced in the process of tunnel excavation for machine-made sand production, and a large amount of stone powder is produced in the process of machine-made sand production. In actual engineering applications, the stone powder is directly applied in concrete as an admixture, but the following problems exist. On the one hand, the dispersion of ordinary tunnel hole slag stone powder in the concrete paste is poor, and it is difficult to uniformly mix with cement and other components, resulting in unstable performance of the concrete, such as large strength fluctuation, poor workability, etc. On the other hand, the activity of the hole slag stone powder itself is low, and it cannot fully play its filling and cementation role in the concrete, and cannot effectively improve the comprehensive performance of the concrete. Therefore, it is of great practical significance to develop an admixture capable of improving the dispersion of tunnel hole slag stone powder in the concrete paste and enhancing the activity thereof and a preparation method thereof. SUMMARY
[0003] The application aims to provide a hole slag stone powder-based concrete paste admixture and a preparation method thereof, so as to solve the problems of poor dispersion and low activity of tunnel hole slag stone powder directly applied in concrete, provide the comprehensive performance of concrete, and realize efficient resource utilization of tunnel hole slag stone powder.
[0004] A first object of the application is to provide a hole slag stone powder-based concrete paste admixture, which comprises the following raw materials: hole slag stone powder, dispersant, water, stone powder enhancer, and water reducing agent. The mass ratio of the hole slag stone powder, dispersant, water, stone powder enhancer, and water reducing agent is 6-8:1-3:4-6:0.5-1:0.5-1.
[0005] Further, the dispersant is composed of attapulgite and anionic polyacrylamide.
[0006] Further, the mass ratio of the attapulgite and the anionic polyacrylamide is 0.5-1:0.5-1.
[0007] Further, the particle size of the attapulgite is 300-400 mesh, and preferably, the particle size of the attapulgite is 325 mu.
[0008] Further, the stone powder enhancer is composed of carbonate, sulfate, and nano silicon dioxide.
[0009] Further, the mass ratio of the carbonate, the sulfate, and the nano silicon dioxide is 1-2:0.5-1:1-2.
[0010] Further, the nano-silica has a particle size of 10-50 nm.
[0011] Further, the hole slag stone powder is one or a mixture of several of limestone powder, basalt powder, dolomite powder and gneiss powder.
[0012] Further, the hole slag stone powder has a specific surface area of greater than 1300 kg / m 3 .
[0013] Further, the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent.
[0014] The second object of the present application is to provide a preparation method of a hole slag stone powder-based concrete paste admixture, comprising: stirring the hole slag stone powder, the dispersant and part of the water to obtain a mixture; adding the stone powder enhancer, the water reducing agent and the remaining water into the mixture and stirring to obtain the hole slag stone powder-based concrete paste admixture.
[0015] Further, the mass ratio of the part of the water to the remaining water is 3-4:1-2, preferably, the mass ratio of the part of the water to the remaining water is 4:1.
[0016] The present application has the following beneficial effects: The hole slag stone powder-based concrete paste admixture and the preparation method thereof of the present application solve the problems of poor dispersibility and low activity of the hole slag stone powder in the concrete paste by introducing the dispersant and the stone powder enhancer into the paste admixture of the hole slag stone powder and water.
[0017] The dispersant promotes the dispersion of the hole slag stone powder in water, effectively prevents the hole slag stone powder from settling in the paste admixture, and improves the stability of the paste admixture.
[0018] The stone powder enhancer can significantly improve the activity index of the paste in the concrete and improve the strength of the concrete. The added nano-silica not only acts as a micro-nano filler, but also acts as a water-retaining material, which can significantly compensate for internal cracks caused by water loss in concrete, thereby relieving the dry shrinkage of concrete and effectively improving the durability of concrete.
[0019] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the description and claims. DETAILED DESCRIPTION
[0020] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.
[0021] Embodiment 1 A tunnel hole slag stone powder-based concrete paste admixture, a stone powder material, a dispersant, water, a stone powder reinforcing agent, and a water reducing agent (for example, a polycarboxylic acid type water reducing agent) each have a mass ratio of 6:1:4:0.5:0.5. The specific surface area of the stone powder material is greater than 1300 kg / m 3 ; The dispersant is composed of attapulgite and anionic polyacrylamide, and the ratio of the components is 1:0.5.
[0022] The stone powder reinforcing agent is composed of sodium carbonate, calcium sulfate, and nano silicon dioxide (10-50 nm), and the ratio of the components is 1:0.5:1.
[0023] The preparation method is as follows: 1) a high-speed stirrer (2000 r / min) is used to uniformly stir the stone powder, the dispersant, and 80% of the water (10 min) so that the stone powder and the dispersant are fully dissolved.
[0024] (2) The self-made stone powder reinforcing agent, the water reducing agent, and the remaining 20% of the water are added to the mixture and uniformly stirred, and the sample state is a colorless and uniform paste. Thus, the high-dispersion modified tunnel hole slag stone powder-based concrete paste admixture is prepared.
[0025] Embodiment 2: A tunnel hole slag stone powder-based concrete paste admixture, a stone powder material, a dispersant, water, a stone powder reinforcing agent, and a water reducing agent (for example, a polycarboxylic acid type water reducing agent) each have a mass ratio of 6:3:6:1:0.5. The specific surface area of the stone powder material is greater than 1300 kg / m 3 ; The dispersant is composed of attapulgite and anionic polyacrylamide, and the ratio of the components is 0.5:0.8.
[0026] The stone powder reinforcing agent is composed of sodium carbonate, calcium sulfate, and nano silicon dioxide (10-50 nm), and the ratio of the components is 1:0.5:1.
[0027] The preparation method is as follows: 1) a high-speed stirrer (2000 r / min) is used to uniformly stir the stone powder, the dispersant, and 80% of the water (10 min) so that the stone powder and the dispersant are fully dissolved.
[0028] (2) Add the stone powder enhancer, water reducer and the remaining 20% of water to the mixture and stir evenly. The sample is in a uniform slurry with no color difference. This is how a highly dispersed modified tunnel slag stone powder-based concrete slurry admixture is prepared.
[0029] Example 3: A tunnel slag stone powder-based concrete slurry admixture, comprising stone powder, a dispersant, water, a stone powder reinforcing agent, and a water reducer (exemplarily a polycarboxylic acid-based water reducer) in a mass ratio of 6:3:6:1:0.5; The specific surface area of the stone powder is greater than 1300 kg / m 3 ; The dispersant consists of attapulgite and anionic polyacrylamide, wherein the ratio of each component is 0.5:1.
[0030] The stone powder enhancer is composed of calcium carbonate, sodium sulfate, and nano-silicon dioxide (10-50nm), with the ratio of each component being 1:0.5:1.
[0031] The preparation method is as follows: 1) using a high-speed stirrer (rotating speed 2000r / min) to stir the stone powder, dispersant and 80% water evenly (10min) to fully dissolve the stone powder and dispersant.
[0032] (2) Add the homemade stone powder enhancer, water reducer and the remaining 20% of water to the mixture and stir evenly. The sample is in a uniform slurry with no color difference. This is how a highly dispersed modified tunnel slag stone powder-based concrete slurry admixture is prepared.
[0033] Example 4: A tunnel slag stone powder-based concrete slurry admixture, comprising stone powder, a dispersant, water, a stone powder reinforcing agent, and a water reducer (exemplarily a polycarboxylic acid-based water reducer) in a mass ratio of 6:3:6:1:0.5; The specific surface area of the stone powder is greater than 1300 kg / m 3 ; The dispersant consists of cellulose, attapulgite and anionic polyacrylamide, wherein the ratio of each component is 0.8:0.5.
[0034] The stone powder enhancer is composed of calcium carbonate, sodium sulfate, and nano-silicon dioxide (10-50nm), with the ratio of each component being 2:1:2.
[0035] The preparation method is as follows: 1) using a high-speed stirrer (rotating speed 2000r / min) to stir the stone powder, dispersant and 80% water evenly (10min) to fully dissolve the stone powder and dispersant.
[0036] (2) Add the self-made stone powder reinforcing agent, water reducing agent, and the remaining 20% of water into the mixture, stir until uniform, and obtain a high-dispersion modified tunnel hole slag stone powder-based concrete slurry admixture with no color difference and uniform slurry.
[0037] Comparative Example 1 The tunnel hole slag stone powder-based concrete slurry admixture provided by the present application is prepared by removing the stone powder reinforcing agent component, and the rest is the same as in Example 1.
[0038] Comparative Example 2 The tunnel hole slag stone powder-based concrete slurry admixture provided by the present application is prepared by removing the dispersant component, and the rest is the same as in Example 1.
[0039] Comparative Example 3 The tunnel hole slag stone powder-based concrete slurry admixture provided by the present application is prepared by removing the water reducing agent, and the rest is the same as in Example 1.
[0040] Test The tunnel hole slag stone powder-based slurry admixture provided by Examples 1-4 and Comparative Examples 1-3 is used to prepare concrete according to the C30 concrete component and weight ratio in Table 1. The obtained concrete is subjected to 28-day compressive strength performance test according to GB / T50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete". The results are shown in Table 2.
[0041] Storage stability test of slurry admixture: 500g of the slurry admixture obtained in Examples 1-4 and Comparative Examples 1-3 is placed in a sealed container and stored at room temperature for 1 month. After 1 month, the mass of the sediment at the bottom of the sealed container is weighed, and the stability of the slurry admixture is evaluated according to the mass of the sediment. The storage stability is divided into 10 levels, with the lightest sediment mass of the final Example 1-4 being level 10, and the mass range of each level being 10g. The sediment mass of levels 9, 8, …, 0 is determined by increasing the sediment mass according to the level, and the sediment mass range of each level is determined. For example, if the lightest sediment mass of Example 1-4 is 7.8g, the weight range of level 10 is 7.8-17.8g, the weight range of level 9 is 17.8-27.8g, and so on, and the weight range of level 0 is 107.8-117.8g.
[0042] The results are shown in Table 2.
[0043] Table 1 C30 concrete mix proportion / kg / m 3
[0044] Note: The water reducing agent in Table 1 is exemplified by polycarboxylic acid type water reducing agent.
[0045] In the above concrete mix, the concrete is prepared by incorporating the stone powder based paste mineral admixture of the present application to replace an equivalent amount of fly ash while reducing the cement content by 5%. The solid content of the stone powder based paste admixture needs to be tested during the preparation process, and the corresponding moisture is deducted.
[0046] Table 2
[0047] As can be seen from the data in Table 2, the introduction of the stone powder enhancer improves the compressive strength of the concrete (28-day compressive strength of Example 1 and Comparative Example 1), and the introduction of the dispersant and water reducing agent together promotes the dispersion stability of the obtained paste mineral admixture, especially the introduction of the dispersant (data of Example 1, Comparative Example 2, Comparative Example 3).
[0048] In summary, by using the stone powder based paste admixture, the strength of the concrete can be significantly improved, and the cement content can be reduced. The stone powder based paste admixture can be more uniformly dispersed in the concrete, making the entire internal system of the concrete more dense, and the mutual interlacing of the hydration products more secure.
[0049] Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent replacements can be made to part of the technical features; and such modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A slag stone powder-based concrete slurry admixture, characterized in that: The raw materials include: slag stone powder, dispersant, water, stone powder enhancer, water reducer; The mass ratio of the slag stone powder, dispersant, water, stone powder enhancer and water reducer is 6-8:1-3:4-6:0.5-1:0.5-1.
2. The slag stone powder-based concrete slurry admixture according to claim 1, characterized in that: The dispersant consists of attapulgite and anionic polyacrylamide.
3. The slag stone powder-based concrete slurry admixture according to claim 2, characterized in that: The mass ratio of the attapulgite to the anionic polyacrylamide is 0.5-1:0.5-1.
4. The slag stone powder-based concrete slurry admixture according to claim 2, characterized in that: The particle size of the attapulgite is 300-400 meshes.
5. The slag stone powder-based concrete paste admixture according to claim 1, characterized in that: The stone powder reinforcing agent consists of carbonate, sulfate and nano silicon dioxide.
6. The slag stone powder-based concrete paste admixture according to claim 5, characterized in that: The mass ratio of the carbonate, the sulfate and the nano-silicon dioxide is 1-2:0.5-1:1-2.
7. The slag stone powder-based concrete paste admixture according to claim 1, characterized in that: The slag stone powder is one or a mixture of limestone powder, basalt stone powder, dolomite stone powder and gneiss stone powder.
8. A slag stone powder-based concrete paste admixture according to any one of claims 1 to 7, characterized in that: The specific surface area of the slag powder is greater than 1300 kg / m 3 .
9. The method for preparing a slag stone powder-based concrete paste admixture according to any one of claims 1 to 8, characterized in that: include: Mix the slag stone powder, dispersant and part of water to obtain a mixture; Add stone powder reinforcing agent, water reducing agent and remaining water into the mixture, stir evenly, and obtain slag stone powder-based concrete paste admixture.
10. The method for preparing a slag stone powder-based concrete paste admixture according to claim 9, characterized in that: The mass ratio of the partial water to the remaining water is 3-4:1-2.