A preparation process of concrete taking tunnel hole slag as raw material
By using tunnel slag as raw material and combining it with components such as basalt fiber and polypropylene fiber, concrete with acid and alkali resistance is prepared. This solves the problem of poor impermeability and frost resistance of concrete made from manufactured sand and gravel aggregate processed from tunnel slag, and realizes the efficient utilization and performance improvement of concrete.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ANHUI UNIV OF SCI & TECH
- Filing Date
- 2023-05-23
- Publication Date
- 2026-07-07
AI Technical Summary
In existing technologies, concrete made from tunnel muck processed into manufactured sand and gravel aggregate has poor impermeability and frost resistance, is easily affected by the natural environment, and has a short service life.
Using tunnel slag as raw material, concrete with acid and alkali resistance is prepared by crushing, screening, producing manufactured sand, and adding components such as basalt fiber, polypropylene fiber, stone powder, and fly ash. This improves impermeability and freeze-thaw resistance. Stone powder is collected by a dust collector to prevent water bleeding and enhance fluidity and spreadability.
It improves the compressive strength, frost resistance, and fluidity of concrete made from tunnel muck, extends the service life of concrete, and achieves full utilization of resources and enhanced stability.
Smart Images
Figure CN116768538B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of building materials, and specifically to a process for preparing concrete using tunnel slag as raw material. Background Technology
[0002] Cement concrete is made by mixing cement as a binder, sand and stone as aggregates, and water in a certain proportion. It is widely used because of its abundant raw materials, low price, and simple production process.
[0003] The construction of highway tunnels generates a large amount of tunnel debris. On the one hand, dumping tunnel debris wastes a lot of land resources. On the other hand, tunnel debris contains rich natural mineral resources. If the tunnel debris is not utilized, it will easily lead to resource waste. At present, there are methods to process tunnel debris into manufactured sand and gravel aggregates to make concrete. The concrete produced by this method has poor impermeability and frost resistance, and is easily damaged by the natural environment, resulting in a short service life.
[0004] Therefore, we propose a preparation process for concrete made from tunnel slag with better impermeability and frost resistance to extend its service life. Summary of the Invention
[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a process for preparing concrete using tunnel slag as raw material.
[0006] A process for preparing concrete using tunnel slag as raw material, wherein the raw material components are as follows:
[0007] 400-500 parts cement, 390-530 parts manufactured sand from cave slag, 65-75 parts stone powder, 10-13 parts hydrated lime, 100-115 parts fly ash, 20-40 parts basalt fiber, 15-45 parts polypropylene fiber, 5-8 parts bentonite, 1-2 parts water-reducing agent, 5-10 parts liquid anti-stripping agent, and 200-135 parts water.
[0008] Furthermore, a process for preparing concrete using tunnel slag as raw material includes the following steps:
[0009] S1: Crushing tunnel muck and performing primary screening.
[0010] After removing the soil and waste from the tunnel muck, it is crushed into coarse and medium crushing, and then subjected to a first-stage vibrating screen to obtain the first-stage screened material.
[0011] S2: Finely crushed and processed into manufactured sand using a single-product process.
[0012] The above-mentioned primary screening material is shaped and crushed, then subjected to secondary vibrating screening, then crushed again, and the resulting stone powder is collected. Finally, it is humidified and stirred, and then processed into sand by a single-production process machine to obtain tunnel slag machined sand.
[0013] S3: Dry-mixed cement and other main materials
[0014] Add 400-500 parts of cement, 390-530 parts of manufactured sand from cave slag, 65-75 parts of stone powder, 10-13 parts of hydrated lime, and 100-115 parts of fly ash to a concrete mixer and mix at a rate of 1200-1500 r / min for 2-3 hours.
[0015] S4: Mixed with basalt fiber and polypropylene fiber
[0016] Basalt fiber and polypropylene fiber are added to a concrete mixer and mixed. Then bentonite and water-reducing agent are added and mixed again. The mixture is then homogenized to obtain a secondary mixture.
[0017] S5: Prepare the mixture and stir it.
[0018] The liquid anti-stripping agent is mixed with water and then pumped into a concrete mixer. After being mixed evenly, concrete made from tunnel slag is obtained.
[0019] Further, step S1 involves crushing the tunnel slag and performing primary screening, specifically including the following steps:
[0020] S1.1: The tunnel slag and rock fragments are fed into a vibrating feeder to remove soil and waste materials, and then fed into a jaw crusher for coarse crushing to obtain coarse crushed material.
[0021] S1.2: The coarse crushed material is fed into the cone crusher by the first belt conveyor for medium crushing to obtain medium crushed material;
[0022] S1.3: After the intermediate crushing is completed, the material is subjected to primary vibrating screening through a primary vibrating screen to obtain primary screened material;
[0023] S1.4: The larger stone chips and sand remaining on the vibrating screen are put back into the cone crusher for secondary crushing.
[0024] Furthermore, the fine crushing in step S2, and the production of manufactured sand through a single-product process, specifically includes the following steps:
[0025] S2.1: The primary screening material between the two screens of the primary vibrating screen is placed in the second belt conveyor. The primary screening material is fed into the first vertical shaft impact crusher at a uniform speed through the second belt conveyor for shaping and fine crushing to obtain fine crushed material.
[0026] S2.2: The above-mentioned fine crushed material is subjected to secondary vibrating screening through a secondary vibrating screen to obtain secondary screened material;
[0027] S2.3: The above-mentioned secondary screened material is added to the second vertical shaft impact crusher for further crushing to obtain the precursor crushed material, and the stone powder is collected by the dust collector;
[0028] S2.4: After the above-mentioned precursor crushed material is processed by a humidifying mixer, it is added to a single-production process machine for sand making to obtain tunnel slag machine sand.
[0029] Furthermore, step S4, the mixing of basalt fiber and polypropylene fiber, specifically includes the following steps:
[0030] S4.1: Add 20-40 parts of basalt fiber and 15-45 parts of polypropylene fiber to the concrete mixer, adjust the mixing speed of the concrete mixer to 600-1000 r / min, and mix for 40-55 min.
[0031] S4.2: Add 5-8 parts bentonite and 1-2 parts water-reducing agent to the concrete mixer, keep the mixing rate constant, and continue mixing for 1-2 hours to obtain a primary mixture;
[0032] S4.3: Add the above primary mixture to the homogenizer and homogenize for 10-25 minutes to obtain the secondary mixture.
[0033] Further, step S5, preparing the mixture and stirring it, specifically includes the following steps:
[0034] S5.1: Add the above-mentioned secondary mixture back into the concrete mixer;
[0035] S5.2: Add 5-10 parts of liquid anti-stripping agent and 200-135 parts of water to a mixing tank and mix with a stirrer to obtain a mixture;
[0036] S5.3: Start the concrete mixer, pump the mixture into the concrete mixer using a water pump, add the mixture while mixing, and after uniform mixing, obtain concrete made from tunnel slag.
[0037] Furthermore, the stone powder used in step S3 is the stone powder collected by the dust collector during the crushing process in the second vertical shaft impact crusher in step S2.3.
[0038] Furthermore, the particle size of the secondary screening material is 10.5-19 mm.
[0039] Furthermore, the water-reducing agent is a retarded polycarboxylic acid-based high-efficiency water-reducing agent.
[0040] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:
[0041] 1. This invention utilizes basalt fiber, which has acid and alkali resistance, to mix and dope with polypropylene fiber to prepare concrete, thereby improving the impermeability and frost resistance of the prepared concrete.
[0042] 2. The process of making tunnel slag into manufactured sand according to the present invention can effectively improve the compressive strength and frost resistance of concrete made from the manufactured sand.
[0043] 3. This invention achieves the effect of fully and effectively utilizing resources by processing tunnel slag into manufactured sand and using this manufactured sand as the main raw material to prepare concrete.
[0044] 4. This invention collects stone powder generated during the crushing of secondary screening material by a dust collector, and then uses the stone powder and fly ash as one of the main raw materials to prepare concrete, so as to prevent the concrete from bleeding when water is added and mixed, thereby improving the fluidity, slump and spreadability of the concrete.
[0045] 5. This invention improves the stability of concrete prepared after mixing with water by incorporating quicklime and liquid anti-stripping agent. Attached Figure Description
[0046] Figure 1 This is a flowchart of the concrete preparation process using tunnel slag as raw material, as used in an embodiment of the present invention. Detailed Implementation
[0047] The present invention will be further described in detail below with reference to specific embodiments.
[0048] Example 1
[0049] A process for preparing concrete using tunnel slag as raw material, such as... Figure 1 As shown, it includes the following steps:
[0050] S1: Crushing tunnel muck and performing primary screening.
[0051] The tunnel slag and rock fragments are fed into a vibrating feeder to remove soil and waste materials, and then fed into a jaw crusher for coarse crushing to obtain coarse crushed material. The coarse crushed material is then sent to a cone crusher via a first belt conveyor for medium crushing to obtain medium crushed material. After medium crushing, the material is screened by a primary vibrating screen to obtain primary screened material. At the same time, the larger stone chips and sand remaining on the vibrating screen are fed back into the cone crusher for secondary medium crushing.
[0052] S2: Finely crushed and processed into manufactured sand using a single-product process.
[0053] The primary screening material between the two screens of the primary vibrating screen is placed in the second belt conveyor. The second belt conveyor slowly and uniformly feeds the primary screening material into the first vertical shaft impact crusher for shaping and fine crushing, obtaining fine crushed material. This fine crushed material is then subjected to secondary vibrating screening by a secondary vibrating screen, obtaining secondary screening material with a particle size of 10.5mm. This secondary screening material is then added to the second vertical shaft impact crusher for further crushing, obtaining precursor crushed material. Stone powder is collected by a dust collector. Finally, the precursor crushed material is processed by a humidifying mixer and then added to a single-product process machine for further processing. Sand making is used to obtain tunnel slag manufactured sand. This sand making process can effectively improve the compressive strength and frost resistance of concrete made from this manufactured sand. By making tunnel slag manufactured sand and using it as the main raw material to prepare concrete, the effect of making full and effective use of resources is achieved. In addition, stone powder generated when the second vertical shaft impact crusher crushes the secondary screening material is collected by a dust collector, and then stone powder and fly ash are used as one of the main raw materials to prepare concrete. This prevents the concrete from bleeding when water is added and mixed, thereby improving the fluidity, slump and spreadability of the concrete.
[0054] S3: Dry-mixed cement and other main materials
[0055] 400 parts of cement, 390 parts of tunnel slag manufactured sand, 65 parts of stone powder collected in the dust collector in step S2, 10 parts of hydrated lime, and 100 parts of fly ash are added to a concrete mixer and mixed at a rate of 1200 r / min for 2 hours. By making tunnel slag manufactured sand and using it as the main raw material to prepare concrete, the effect of making full and effective use of resources is achieved.
[0056] S4: Mixed with basalt fiber and polypropylene fiber
[0057] 20 parts of basalt fiber and 15 parts of polypropylene fiber were added to a concrete mixer. The mixing speed of the concrete mixer was adjusted to 600 r / min and mixed for 40 min. Then, 5 parts of bentonite and 1 part of retarding polycarboxylic acid-based high-efficiency water-reducing agent were added to the concrete mixer. The mixing speed was kept constant and the mixing was continued for 1 h to obtain a primary mixture. The primary mixture was then added to a homogenizer and homogenized for 10 min to obtain a secondary mixture. By using basalt fiber with acid and alkali resistance and polypropylene fiber to prepare concrete, the impermeability and frost resistance of the prepared concrete can be improved.
[0058] S5: Prepare the mixture and stir it.
[0059] The above-mentioned secondary mixture is added to the concrete mixer again. Then, 5 parts of liquid anti-stripping agent and 200 parts of water are added to the mixing tank and mixed with a mixer to obtain a mixture. The concrete mixer is started, and the mixture is pumped into the concrete mixer through a water pump. The mixture is added while stirring. After uniform mixing, concrete made from tunnel slag is obtained. The stability of the concrete made after mixing with water is improved by adding quicklime and liquid anti-stripping agent.
[0060] Example 2
[0061] A process for preparing concrete using tunnel slag as raw material, such as... Figure 1 As shown, it includes the following steps:
[0062] S1: Crushing tunnel muck and performing primary screening.
[0063] The tunnel slag and rock fragments are fed into a vibrating feeder to remove soil and waste materials, and then fed into a jaw crusher for coarse crushing to obtain coarse crushed material. The coarse crushed material is then sent to a cone crusher via a first belt conveyor for medium crushing to obtain medium crushed material. After medium crushing, the material is screened by a primary vibrating screen to obtain primary screened material. At the same time, the larger stone chips and sand remaining on the vibrating screen are fed back into the cone crusher for secondary medium crushing.
[0064] S2: Finely crushed and processed into manufactured sand using a single-product process.
[0065] The primary screening material between the two screens of the primary vibrating screen is placed in the second belt conveyor. The second belt conveyor slowly and uniformly feeds the primary screening material into the first vertical shaft impact crusher for shaping and fine crushing, obtaining fine crushed material. This fine crushed material is then subjected to secondary vibrating screening by a secondary vibrating screen, obtaining secondary screening material with a particle size of 15mm. This secondary screening material is then added to the second vertical shaft impact crusher for further crushing, obtaining precursor crushed material. Stone powder is collected by a dust collector. Finally, the precursor crushed material is processed by a humidifying mixer and then added to a single-product process machine for further processing. Sand is used to produce tunnel slag manufactured sand. This sand-making process can effectively improve the compressive strength and frost resistance of concrete made from this manufactured sand. By making tunnel slag manufactured sand and using it as the main raw material to prepare concrete, the resource utilization effect is fully and effectively achieved. In addition, stone powder generated when the second vertical shaft impact crusher crushes the secondary screening material is collected by a dust collector, and then stone powder and fly ash are used as one of the main raw materials to prepare concrete. This prevents the concrete from bleeding when water is added and mixed, thereby improving the fluidity, slump and spreadability of the concrete.
[0066] S3: Dry-mixed cement and other main materials
[0067] 500 parts of cement, 530 parts of tunnel slag manufactured sand, 75 parts of stone powder collected in the dust collector in step S2, 13 parts of hydrated lime, and 115 parts of fly ash are added to a concrete mixer and mixed at a rate of 1200 r / min for 2 hours. By making tunnel slag manufactured sand and using it as the main raw material to prepare concrete, the effect of making full and effective use of resources is achieved.
[0068] S4: Mixed with basalt fiber and polypropylene fiber
[0069] 40 parts of basalt fiber and 45 parts of polypropylene fiber were added to a concrete mixer, and the mixing speed of the concrete mixer was adjusted to 600 r / min. The mixture was mixed for 40 min. Then, 8 parts of bentonite and 2 parts of retarding polycarboxylic acid-based high-efficiency water-reducing agent were added to the concrete mixer. The mixing speed was kept constant, and the mixture was mixed for 1 h to obtain a primary mixture. The primary mixture was then added to a homogenizer and homogenized for 10 min to obtain a secondary mixture. By using basalt fiber and polypropylene fiber, which have acid and alkali resistance, to prepare concrete, the impermeability and frost resistance of the concrete can be improved.
[0070] S5: Prepare the mixture and stir it.
[0071] Add the above secondary mixture to the concrete mixer again, then add 5-10 parts of liquid anti-stripping agent and 200-135 parts of water to the mixing tank, and mix with a mixer to obtain a mixture. Start the concrete mixer and pump the mixture into the concrete mixer through a water pump. Add the mixture while stirring, and after uniform mixing, obtain concrete made from tunnel slag. By adding quicklime and liquid anti-stripping agent, the stability of the concrete made after mixing with water is improved.
[0072] Example 3
[0073] A process for preparing concrete using tunnel slag as raw material, such as... Figure 1 As shown, it includes the following steps:
[0074] S1: Crushing tunnel muck and performing primary screening.
[0075] The tunnel slag and rock fragments are fed into a vibrating feeder to remove soil and waste materials, and then fed into a jaw crusher for coarse crushing to obtain coarse crushed material. The coarse crushed material is then sent to a cone crusher via a first belt conveyor for medium crushing to obtain medium crushed material. After medium crushing, the material is screened by a primary vibrating screen to obtain primary screened material. At the same time, the larger stone chips and sand remaining on the vibrating screen are fed back into the cone crusher for secondary medium crushing.
[0076] S2: Finely crushed and processed into manufactured sand using a single-product process.
[0077] The primary screening material between the two screens of the primary vibrating screen is placed in the second belt conveyor. The second belt conveyor slowly and uniformly feeds the primary screening material into the first vertical shaft impact crusher for shaping and fine crushing, obtaining fine crushed material. This fine crushed material is then subjected to secondary vibrating screening by a secondary vibrating screen, obtaining secondary screening material with a particle size of 19mm. This secondary screening material is then added to the second vertical shaft impact crusher for further crushing, obtaining precursor crushed material. Stone powder is collected by a dust collector. Finally, the precursor crushed material is processed by a humidifying mixer and then added to a single-product process machine for further processing. Sand is used to produce tunnel slag manufactured sand. This sand-making process can effectively improve the compressive strength and frost resistance of concrete made from this manufactured sand. By making tunnel slag manufactured sand and using it as the main raw material to prepare concrete, the resource utilization effect is fully and effectively achieved. In addition, stone powder generated when the second vertical shaft impact crusher crushes the secondary screening material is collected by a dust collector, and then stone powder and fly ash are used as one of the main raw materials to prepare concrete. This prevents the concrete from bleeding when water is added and mixed, thereby improving the fluidity, slump and spreadability of the concrete.
[0078] S3: Dry-mixed cement and other main materials
[0079] 400 parts of cement, 390 parts of tunnel slag manufactured sand, 65 parts of stone powder collected in the dust collector in step S2, 10 parts of hydrated lime, and 100 parts of fly ash are added to a concrete mixer and mixed at a rate of 1500 r / min for 2 hours. By making tunnel slag manufactured sand and using it as the main raw material to prepare concrete, the effect of making full and effective use of resources is achieved.
[0080] S4: Mixed with basalt fiber and polypropylene fiber
[0081] 20 parts of basalt fiber and 15 parts of polypropylene fiber were added to a concrete mixer. The mixing speed of the concrete mixer was adjusted to 1000 r / min and mixed for 40 min. Then, 5 parts of bentonite and 1 part of retarding polycarboxylic acid-based high-efficiency water-reducing agent were added to the concrete mixer. The mixing speed was kept constant and the mixing was continued for 1 h to obtain a primary mixture. The primary mixture was then added to a homogenizer and homogenized for 10 min to obtain a secondary mixture. By using basalt fiber with acid and alkali resistance to be mixed with polypropylene fiber to prepare concrete, the impermeability and frost resistance of the concrete can be improved.
[0082] S5: Prepare the mixture and stir it.
[0083] The above-mentioned secondary mixture is added to the concrete mixer again. Then, 5 parts of liquid anti-stripping agent and 200 parts of water are added to the mixing tank and mixed with a mixer to obtain a mixture. The concrete mixer is started, and the mixture is pumped into the concrete mixer through a water pump. The mixture is added while stirring. After uniform mixing, concrete made from tunnel slag is obtained. The stability of the concrete made after mixing with water is improved by adding quicklime and liquid anti-stripping agent.
[0084] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.
Claims
1. A process for preparing concrete using tunnel slag as raw material, characterized in that, The raw material components used are as follows: 400-500 parts cement, 390-530 parts manufactured sand from cave slag, 65-75 parts stone powder, 10-13 parts hydrated lime, 100-115 parts fly ash, 20-40 parts basalt fiber, 15-45 parts polypropylene fiber, 5-8 parts bentonite, 1-2 parts water-reducing agent, 5-10 parts liquid anti-stripping agent, and 135-200 parts water; Includes the following steps: S1: Crushing tunnel muck and performing primary screening. After removing the soil and waste from the tunnel muck, it is crushed into coarse and medium crushing, and then subjected to a first-stage vibrating screen to obtain the first-stage screened material. S2: Finely crushed and processed into manufactured sand using a single-product process. The above-mentioned primary screening material is shaped and crushed, then subjected to secondary vibrating screening, then crushed again, and the resulting stone powder is collected. Finally, it is humidified and stirred, and then processed into sand by a single-production process machine to obtain tunnel slag machined sand. S3: Dry mixing of main ingredients Add 400-500 parts of cement, 390-530 parts of manufactured sand from cave slag, 65-75 parts of stone powder, 10-13 parts of hydrated lime, and 100-115 parts of fly ash to a concrete mixer and mix at a rate of 1200-1500 r / min for 2-3 hours. S4: Mixed with basalt fiber and polypropylene fiber Basalt fiber and polypropylene fiber are added to a concrete mixer and mixed. Then bentonite and water-reducing agent are added and mixed again. The mixture is then homogenized to obtain a secondary mixture. S5: Prepare the mixture and stir to mix. The liquid anti-stripping agent is mixed with water and then pumped into a concrete mixer. After being mixed evenly, concrete made from tunnel slag is obtained.
2. The process for preparing concrete using tunnel slag as raw material according to claim 1, characterized in that, Step S1 involves crushing tunnel slag and performing primary screening, specifically including the following steps: S1.1: The tunnel slag and rock fragments are fed into a vibrating feeder to remove soil and waste materials, and then fed into a jaw crusher for coarse crushing to obtain coarse crushed material. S1.2: The coarse crushed material is fed into the cone crusher by the first belt conveyor for medium crushing to obtain medium crushed material; S1.3: After the intermediate crushing is completed, the material is subjected to primary vibrating screening through a primary vibrating screen to obtain primary screened material; S1.4: The larger stone chips and sand remaining on the vibrating screen are put back into the cone crusher for secondary crushing.
3. The process for preparing concrete using tunnel slag as raw material according to claim 1, characterized in that, Step S2, which involves fine crushing and producing manufactured sand using a single-product process, specifically includes the following steps: S2.1: The primary screening material between the two screens of the primary vibrating screen is placed in the second belt conveyor. The primary screening material is fed into the first vertical shaft impact crusher at a uniform speed through the second belt conveyor for shaping and fine crushing to obtain fine crushed material. S2.2: The above-mentioned fine crushed material is subjected to secondary vibrating screening through a secondary vibrating screen to obtain secondary screened material; S2.3: The above-mentioned secondary screened material is added to the second vertical shaft impact crusher for further crushing to obtain the precursor crushed material, and the stone powder is collected by the dust collector; S2.4: After the above-mentioned precursor crushed material is processed by a humidifying mixer, it is added to a single-production process machine for sand making to obtain tunnel slag machine sand.
4. The process for preparing concrete using tunnel slag as raw material according to claim 1, characterized in that, Step S4, the mixing of basalt fiber and polypropylene fiber, specifically includes the following steps: S4.1: Add 20-40 parts of basalt fiber and 15-45 parts of polypropylene fiber to the concrete mixer, adjust the mixing speed of the concrete mixer to 600-1000 r / min, and mix for 40-55 min. S4.2: Add 5-8 parts bentonite and 1-2 parts water-reducing agent to the concrete mixer, keep the mixing rate constant, and continue mixing for 1-2 hours to obtain a primary mixture; S4.3: Add the above primary mixture to the homogenizer and homogenize for 10-25 minutes to obtain the secondary mixture.
5. The process for preparing concrete using tunnel slag as raw material according to claim 1, characterized in that, Step S5, preparing the mixture and stirring it, specifically includes the following steps: S5.1: Add the above-mentioned secondary mixture back into the concrete mixer; S5.2: Add 5-10 parts of liquid anti-stripping agent and 200-135 parts of water to a mixing tank and mix with a stirrer to obtain a mixture; S5.3: Start the concrete mixer, pump the mixture into the concrete mixer using a water pump, add the mixture while mixing, and after uniform mixing, obtain concrete made from tunnel slag.
6. The process for preparing concrete using tunnel slag as raw material according to claim 3, characterized in that, The stone powder used in step S3 is the stone powder collected by the dust collector during the crushing process in the second vertical shaft impact crusher in step S2.
3.
7. The process for preparing concrete using tunnel slag as raw material according to claim 3, characterized in that, The particle size of the secondary screening material is 10.5-19mm.
8. The process for preparing concrete using tunnel slag as raw material according to claim 2, characterized in that, The water-reducing agent is a retarded polycarboxylate-based high-efficiency water-reducing agent.