Preparation process of microcrystalline glass aggregate concrete

Abstract

This invention discloses a preparation process for microcrystalline glass aggregate concrete, comprising the following steps: (1) crushing microcrystalline glass into coarse aggregate, and then placing the coarse aggregate in an alkaline solution for activation treatment. After completion, the obtained coarse aggregate is washed and mixed with saturated lime water, and then subjected to hydrothermal reaction. (2) calcining the obtained coarse aggregate after hydrothermal reaction, and then cooling it to room temperature to obtain pretreated microcrystalline glass coarse aggregate. (3) taking 415~490 parts by weight of the pretreated microcrystalline glass coarse aggregate, 170~200 parts by weight of silicate cement, 535~620 parts by weight of river sand, 20~30 parts by weight of inorganic filler, and 2.7~4 parts by weight of water-reducing agent, with a water-cement ratio of 0.40~0.44. After mixing the above raw materials evenly, microcrystalline glass aggregate concrete is obtained. This invention effectively overcomes the problem of deterioration of concrete mechanical properties caused by bleeding phenomenon by using pretreated microcrystalline glass aggregate.

Description

Technical Field

[0001] This invention relates to the field of concrete preparation technology, and specifically to a preparation process for microcrystalline glass aggregate concrete. 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 the information has become prior art known to those skilled in the art.

[0003] Aggregates, also known as aggregates, play two main roles in concrete: first, they act as a skeleton, and second, they act as fillers. The combined volume of coarse and fine aggregates in concrete accounts for the vast majority of the total volume, making them the main component of concrete. Based on their source and processing methods, aggregates are divided into natural aggregates and artificial aggregates. Natural aggregates refer to sand and gravel collected from natural rivers, mountains, or oceans. After screening, washing, and simple processing, they possess a rounded shape, a hard texture, and a smooth surface, making them ideal raw materials for concrete.

[0004] However, with the rapid increase in concrete usage, a large amount of sand and gravel is needed as aggregate for concrete preparation, leading to a rapid increase in sand and gravel consumption and a sharp depletion of sand and gravel resources in my country in recent years. Simultaneously, the large-scale mining of mountain rocks for aggregate production has caused severe ecological damage. Therefore, artificial aggregates have become a solution to replace natural aggregates. Microcrystalline glass is a type of polycrystalline solid material containing a large amount of microcrystalline and glassy phases, produced by controlling the crystallization of a base glass with a specific composition during heating. It is a material between ordinary glass and ceramics, which makes its various properties superior to both glass and ceramic materials, making it a key area of ​​promotion and research in the current building materials field.

[0005] Microcrystalline glass not only possesses high strength, corrosion resistance, and excellent wear resistance, but its flexural strength can also reach approximately ten times that of ordinary glass. Furthermore, the industrial solid wastes used in the production of microcrystalline glass, such as blast furnace slag, steel slag, chromium slag, tailings, waste ceramics, waste bricks, fly ash, and fly ash, are abundant and readily available. Therefore, using microcrystalline glass as a substitute for natural aggregates in concrete preparation can not only reduce dependence on natural aggregates but also facilitate the resource utilization of the aforementioned industrial solid wastes. However, the inventors have discovered that due to its extremely dense structure, microcrystalline glass has an almost zero water absorption rate, far lower than that of natural aggregates such as sand and gravel. Therefore, when using microcrystalline glass aggregates to prepare concrete, significant bleeding occurs, leading to a deterioration in the mechanical properties of the concrete. Lowering the water-cement ratio to avoid this bleeding can easily result in insufficient hydration of the concrete in the later stages, affecting the development of its later strength. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a preparation process for microcrystalline glass aggregate concrete, which effectively overcomes the deterioration of concrete's mechanical properties caused by bleeding by using pretreated microcrystalline glass aggregate. Specifically, the technical solution of this invention is as follows.

[0007] A process for preparing microcrystalline glass aggregate concrete includes the following steps:

[0008] (1) The microcrystalline glass is crushed into coarse aggregate, and then the coarse aggregate is placed in an alkaline solution for activation treatment. After completion, the obtained coarse aggregate is mixed with saturated lime water and then subjected to a hydrothermal reaction.

[0009] (2) The coarse aggregate obtained after the hydrothermal reaction is calcined and then cooled to room temperature to obtain pretreated microcrystalline glass coarse aggregate for later use.

[0010] (3) Take the following raw materials: 415-490 parts by weight of the pretreated microcrystalline glass coarse aggregate, 170-200 parts by weight of silicate cement, 535-620 parts by weight of river sand, 20-30 parts by weight of inorganic filler, and 2.7-4 parts by weight of water-reducing agent, with a water-cement ratio of 0.40-0.44. Mix the above raw materials evenly to obtain microcrystalline glass aggregate concrete.

[0011] Further, in step (1), the ratio of coarse aggregate to alkaline solution is 1g: 5~15ml. Optionally, the alkaline solution includes any one of sodium hydroxide solution, potassium hydroxide solution, etc. The mass fraction of the alkaline solution is 3~5%.

[0012] Further, in step (1), the alkaline activation treatment lasts for 4 to 6 hours. Preferably, the alkaline activation treatment is performed at a temperature of 50 to 65°C.

[0013] Further, in step (1), the ratio of coarse aggregate to saturated lime water is 1g: 20~30ml.

[0014] Furthermore, in step (1), the temperature of the hydrothermal reaction is 160~200℃ and the reaction time is 1.5~2 hours.

[0015] Furthermore, in step (2), the calcination temperature is 450~650℃ and the time is 30~45min.

[0016] Furthermore, in step (3), the inorganic filler includes at least one of fly ash, silica fume, calcium carbonate powder, glass powder, and silica powder. The inorganic filler helps to improve the compactness of the concrete structure.

[0017] Further, in step (3), the water-reducing agent includes any one of polycarboxylate water-reducing agents, naphthalene-based water-reducing agents, lignin sulfonate water-reducing agents, etc. Optionally, the water-reducing agent has a water reduction rate of 20-27%.

[0018] Further, in step (3), the raw materials also include 17-25 parts by weight of modified fiber. This modified fiber is prepared by the following method: chopped basalt fiber, carbon powder, and glass powder are mixed evenly in a ratio of 1 part by weight: 1.5-3 parts by weight: 0.35-0.45 parts by weight. The mixture is then heated in an oxygen-free protective atmosphere to above the softening temperature of the glass powder and held at that temperature. After completion, the temperature is lowered to below the softening temperature and held at that temperature. Then, air is used to replace the protective atmosphere for continued holding at that temperature. Finally, the mixture is cooled to room temperature, and the resulting basalt fiber is washed and dried to obtain the modified fiber.

[0019] Furthermore, the length of the chopped basalt fibers is 20-30 mm.

[0020] Furthermore, the glass powder has a fineness of 100-150 mesh. Optionally, the softening point temperature of the glass powder does not exceed 800°C.

[0021] Further, the mixture is heated in a protective atmosphere to 10-20°C above the softening temperature and held at that temperature for 5-10 minutes. Optionally, the protective atmosphere includes any one of nitrogen, argon, etc.

[0022] Furthermore, the temperature is lowered to 60-100°C below the softening temperature and held for 10-20 minutes to allow the softened glass powder to harden again, thereby roughening the fiber surface.

[0023] Furthermore, after replacing the protective atmosphere with air, the temperature is maintained for at least 25 minutes to allow the carbon powder to be fully burned and removed in the air.

[0024] Further, the basalt fiber is washed with clean water to remove residual ash, drained of moisture, and then dried at 100~150℃ for 45~60 minutes.

[0025] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0026] (1) To address the bleeding phenomenon that occurs when preparing concrete using microcrystalline glass aggregate, this invention first places the microcrystalline glass aggregate in an alkaline solution for activation treatment. During this process, the silicon-oxygen tetrahedra and aluminum-oxygen tetrahedra on the surface of the microcrystalline glass aggregate gradually depolymerize under the action of hydroxide ions, causing the Si-O and Al-O bonds to break, thereby transforming the inert surface of the microcrystalline glass aggregate into an active surface. When the microcrystalline glass aggregate is further mixed with saturated lime water and subjected to a hydrothermal reaction, the broken Si-O and Al-O bonds on the active surface undergo a secondary hydration reaction with the calcium hydroxide in the lime water to form products such as hydrated calcium silicate and hydrated calcium aluminate, which coat the surface of the microcrystalline glass aggregate. Moreover, since the products are chemically bonded to the surface of the microcrystalline glass aggregate, and due to the gel properties of the products, the interface between the two is very tight and firm. Furthermore, this invention calcines the above-mentioned microcrystalline glass aggregate to dehydrate the hydrated calcium silicate and hydrated calcium aluminate on the surface of the aggregate, transforming them into unhydrated calcium silicate and calcium aluminate. On the one hand, dehydration creates numerous pores in the coating layer formed by the calcium silicate and calcium aluminate, thereby increasing the water absorption rate of the microcrystalline glass aggregate. During concrete preparation, this allows it to absorb mixing water and prevent bleeding. On the other hand, the dehydrated calcium silicate and calcium aluminate possess rehydration properties. During concrete preparation, these rehydration forms hydrated calcium silicate and hydrated calcium aluminate cementitious substances, resulting in a stronger bond between the microcrystalline glass aggregate and the concrete matrix, thus improving the mechanical properties of the concrete.

[0027] (2) Modified fibers are also added to the concrete of the present invention to further improve its mechanical strength. This is because the microcrystalline glass aggregate is obtained by mechanically crushing large pieces of microcrystalline glass. Therefore, the surface of the microcrystalline glass aggregate has many sharp edges. When the concrete structure is subjected to load, these sharp edges are prone to stress concentration, which makes the concrete more prone to cracking and reduces the mechanical strength of the concrete structure. To this end, the present invention first heat-treats a mixture of basalt fiber, carbon powder, and glass powder at high temperature. During this process, the glass particles on the surface of the basalt fiber melt and the two combine together. After cooling, the glass particles harden again, thereby forming a rough surface of the basalt fiber. Finally, air is used instead of the protective atmosphere for heat treatment to burn off the carbon powder and obtain dispersed modified fibers. After the modified fibers enter the concrete, their rough surface helps to prevent the fibers from being pulled out of the matrix when the concrete structure is under stress, thereby better improving the mechanical strength of the concrete structure. Attached Figure Description

[0028] The accompanying drawings, which form part of this invention, 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 improper limitation of the invention.

[0029] Figure 1 The image shows a sample of the microcrystalline glass aggregate used in the following embodiments.

[0030] Figure 2 The image shows a sample of a microcrystalline glass aggregate concrete specimen prepared in Example 1 below. Detailed Implementation

[0031] The present invention will be 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. Furthermore, any methods and materials similar to or equivalent to those described herein can be applied to the methods of the present invention. The technical solution of the present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0032] Example 1

[0033] A process for preparing microcrystalline glass aggregate concrete includes the following steps:

[0034] (1) Break the blocky microcrystalline glass into aggregate form (e.g.) Figure 1 (As shown), then the aggregate with a particle size of 5-10 mm was screened out, and mixed with a 5% sodium hydroxide solution at a ratio of 1 g: 10 ml. After stirring evenly, the mixture was heated to 60℃ and kept at that temperature for 5 hours for activation treatment. After activation, the obtained coarse aggregate was added to a reaction vessel with saturated lime water at a ratio of 1 g: 30 ml, and then hydrothermally reacted at 180℃ for 2 hours.

[0035] (2) After the hydrothermal reaction is completed, the coarse aggregate obtained is drained and placed in a heating furnace. Then, the temperature is raised to 630°C at a heating rate of 10°C / min and held for 40 minutes. After the heating is completed, the coarse aggregate is cooled to room temperature in the furnace to obtain the pretreated microcrystalline glass coarse aggregate for later use.

[0036] (3) Take the following raw materials: 460 parts by weight of pretreated microcrystalline glass coarse aggregate, 180 parts by weight of 42.5 ordinary Portland cement, 600 parts by weight of river sand, 25 parts by weight of fly ash, and 3.5 parts by weight of polycarboxylate superplasticizer (water reduction rate 25%). Add the above raw materials to the mixer and dry mix for 3 minutes. Then add water at a water-cement ratio of 0.42 and mix evenly to obtain microcrystalline glass aggregate concrete.

[0037] 1. Boil the pretreated microcrystalline glass coarse aggregate prepared in this embodiment in a water bath for one hour, remove it, air dry it, and weigh it immediately (the result is accurate to 0.001g). Then calculate the water absorption rate using the following formula: P=(M2-M1) / M1×100%, where: M1 is the initial mass of the pretreated microcrystalline glass coarse aggregate, and M2 is the mass of the pretreated microcrystalline glass coarse aggregate after air drying.

[0038] 2. The microcrystalline glass aggregate concrete prepared in this embodiment is used to make concrete specimens (such as...). Figure 2 As shown in the figure, after curing for 28 days, the compressive strength of the specimen was tested according to the "Standard for Testing and Evaluation of Concrete Strength" (GB / T 50107-2010).

[0039] The test results for the above technical indicators are as follows: water absorption rate = 2.36%, compressive strength = 63.31 MPa.

[0040] Example 2

[0041] A process for preparing microcrystalline glass aggregate concrete includes the following steps:

[0042] (1) The blocky microcrystalline glass was crushed into aggregate, and then the aggregate with a particle size of 5-10 mm was screened out. It was mixed with a 3% sodium hydroxide solution at a ratio of 1 g: 15 ml and stirred evenly. Then it was heated to 50°C and kept at that temperature for 6 hours for activation treatment. After completion, the obtained coarse aggregate and saturated lime water were added to the reactor at a ratio of 1 g: 25 ml, and then hydrothermally reacted at 170°C for 2 hours.

[0043] (2) After the hydrothermal reaction is completed, the coarse aggregate obtained is dried and placed in a heating furnace. Then, the temperature is raised to 600°C at a heating rate of 10°C / min and held for 45 minutes. After the process is completed, the coarse aggregate is cooled to room temperature in the furnace to obtain the pretreated microcrystalline glass coarse aggregate for later use.

[0044] (3) Take the following raw materials: 415 parts by weight of pretreated microcrystalline glass coarse aggregate, 170 parts by weight of 42.5 ordinary Portland cement, 535 parts by weight of river sand, 20 parts by weight of calcium carbonate powder, and 2.7 parts by weight of polycarboxylate superplasticizer (water reduction rate 27%). Add the above raw materials to the mixer and dry mix for 3 minutes. Then add water according to the water-cement ratio of 0.44 and mix evenly to obtain microcrystalline glass aggregate concrete.

[0045] 1. Boil the pretreated microcrystalline glass coarse aggregate prepared in this embodiment in a water bath for one hour, remove it, air dry it, and weigh it immediately (the result is accurate to 0.001g). Then calculate the water absorption rate using the following formula: P=(M2-M1) / M1×100%, where: M1 is the initial mass of the pretreated microcrystalline glass coarse aggregate, and M2 is the mass of the pretreated microcrystalline glass coarse aggregate after air drying.

[0046] 2. The compressive strength of the microcrystalline glass aggregate concrete prepared in this embodiment was tested according to the "Standard for Testing and Evaluation of Concrete Strength" (GB / T 50107-2010).

[0047] The test results for the above technical indicators are as follows: water absorption rate = 2.17%, compressive strength = 61.74 MPa.

[0048] Example 3

[0049] A process for preparing microcrystalline glass aggregate concrete includes the following steps:

[0050] (1) The blocky microcrystalline glass was crushed into aggregate, and then the aggregate with a particle size of 5~15mm was screened out. It was mixed with a 5% sodium hydroxide solution at a ratio of 1g:5ml and stirred evenly. Then it was heated to 55℃ and kept at that temperature for 4.5 hours for activation treatment. After completion, the obtained coarse aggregate and saturated lime water were added to the reaction vessel at a ratio of 1g:20ml, and then hydrothermally reacted at 200℃ for 1.5 hours.

[0051] (2) After the hydrothermal reaction is completed, the coarse aggregate obtained is drained and placed in a heating furnace. Then, the temperature is raised to 650°C at a heating rate of 10°C / min and held for 30 minutes. After the process is completed, the coarse aggregate is cooled to room temperature in the furnace to obtain the pretreated microcrystalline glass coarse aggregate for later use.

[0052] (3) Basalt fiber, carbon powder, and glass powder are mixed in a ratio of 1 part by weight: 3 parts by weight: 0.45 parts by weight and stirred evenly. The length of the basalt fiber is 20 mm, and the fineness of the glass powder is 150 mesh, with a softening temperature range of approximately 720~735°C. The resulting mixture is then placed in a heating furnace with nitrogen as the protective atmosphere. The temperature is raised to 745°C at a heating rate of 10°C / min and held for 5 min. After completion, the temperature is lowered to 685°C and held for 20 min. After completion, air is introduced to replace the protective atmosphere, and the temperature is held for another 25 min. Then, the mixture is cooled to room temperature. The resulting chopped basalt fiber is washed with water and then placed in an oven and dried at 150°C for 45 min to obtain the modified fiber.

[0053] (4) Take the following raw materials: 470 parts by weight of pretreated microcrystalline glass coarse aggregate, 190 parts by weight of 42.5 ordinary Portland cement, 620 parts by weight of river sand, 25 parts by weight of silica fume, 3.5 parts by weight of polycarboxylate superplasticizer (water reduction rate 20%), and 17 parts by weight of modified fiber in this embodiment. Add the above raw materials to the mixer and dry mix for 3 minutes. Then add water at a water-cement ratio of 0.42 and mix evenly to obtain microcrystalline glass aggregate concrete.

[0054] 1. Boil the pretreated microcrystalline glass coarse aggregate prepared in this embodiment in a water bath for one hour, remove it, air dry it, and weigh it immediately (the result is accurate to 0.001g). Then calculate the water absorption rate using the following formula: P=(M2-M1) / M1×100%, where: M1 is the initial mass of the pretreated microcrystalline glass coarse aggregate, and M2 is the mass of the pretreated microcrystalline glass coarse aggregate after air drying.

[0055] 2. The compressive strength of the microcrystalline glass aggregate concrete prepared in this embodiment was tested according to the "Standard for Testing and Evaluation of Concrete Strength" (GB / T 50107-2010).

[0056] The test results for the above technical indicators are as follows: water absorption rate = 2.49%, compressive strength = 71.52 MPa.

[0057] Example 4

[0058] A process for preparing microcrystalline glass aggregate concrete includes the following steps:

[0059] (1) The blocky microcrystalline glass is crushed into aggregate, and then the aggregate with a particle size of 5~20mm is screened out. It is mixed with a 5% potassium hydroxide solution at a ratio of 1g:10ml and stirred evenly. Then it is heated to 65℃ and kept at the temperature for 4 hours for activation treatment. After completion, the obtained coarse aggregate is added to the reaction vessel with saturated lime water at a ratio of 1g:30ml, and then hydrothermally reacted at 160℃ for 2 hours.

[0060] (2) After the hydrothermal reaction is completed, the coarse aggregate obtained is drained and placed in a heating furnace. Then, the temperature is raised to 650°C at a heating rate of 10°C / min and held for 40 minutes. After the process is completed, the coarse aggregate is cooled to room temperature in the furnace to obtain the pretreated microcrystalline glass coarse aggregate for later use.

[0061] (3) Basalt fiber, carbon powder, and glass powder are mixed in a ratio of 1 part by weight: 1.5 parts by weight: 0.35 parts by weight and stirred evenly. The basalt fiber has a length of 30 mm, and the glass powder has a fineness of 100 mesh and a softening temperature range of approximately 770~790℃. The resulting mixture is then placed in a heating furnace with nitrogen as the protective atmosphere. The temperature is raised to 800℃ at a heating rate of 10℃ / min and held for 10 min. After completion, the temperature is lowered to 700℃ and held for 10 min. After completion, air is introduced to replace the protective atmosphere, and the temperature is maintained for another 30 min. Then, the mixture is cooled to room temperature. The resulting chopped basalt fiber is washed with water and then placed in an oven and dried at 100℃ for 60 min to obtain the modified fiber.

[0062] (4) Take the following raw materials: 490 parts by weight of pretreated microcrystalline glass coarse aggregate, 200 parts by weight of 42.5 ordinary silicate cement, 610 parts by weight of river sand, 30 parts by weight of glass powder, 4 parts by weight of polycarboxylate superplasticizer (water reduction rate 25%), and 25 parts by weight of modified fiber in this embodiment. Add the above raw materials to the mixer and dry mix for 3 minutes. Then add water according to the water-cement ratio of 0.4 and mix evenly to obtain microcrystalline glass aggregate concrete.

[0063] 1. Boil the pretreated microcrystalline glass coarse aggregate prepared in this embodiment in a water bath for one hour, remove it, air dry it, and weigh it immediately (the result is accurate to 0.001g). Then calculate the water absorption rate using the following formula: P=(M2-M1) / M1×100%, where: M1 is the initial mass of the pretreated microcrystalline glass coarse aggregate, and M2 is the mass of the pretreated microcrystalline glass coarse aggregate after air drying.

[0064] 2. The compressive strength of the microcrystalline glass aggregate concrete prepared in this embodiment was tested according to the "Standard for Testing and Evaluation of Concrete Strength" (GB / T 50107-2010).

[0065] The test results for the above technical indicators are as follows: water absorption rate = 2.02%, compressive strength = 73.16 MPa.

[0066] Example 5

[0067] A process for preparing microcrystalline glass aggregate concrete includes the following steps:

[0068] (1) Crush the blocky microcrystalline glass into aggregate, and then screen out the aggregate with a particle size of 10~20mm as coarse aggregate for microcrystalline glass.

[0069] (2) Take the following raw materials: 460 parts by weight of microcrystalline glass coarse aggregate, 180 parts by weight of 42.5 ordinary Portland cement, 600 parts by weight of river sand, 25 parts by weight of fly ash, and 3.5 parts by weight of polycarboxylate superplasticizer (water reduction rate 25%). Add the above raw materials to the mixer and dry mix for 3 minutes. Then add water according to the water-cement ratio of 0.42 and mix evenly to obtain microcrystalline glass aggregate concrete.

[0070] 1. Boil the microcrystalline glass coarse aggregate prepared in this embodiment in a water bath for one hour, remove it, air dry it, and weigh it immediately (the result is accurate to 0.001g). Then calculate the water absorption rate using the following formula: P=(M2-M1) / M1×100%, where: M1 is the initial mass of the microcrystalline glass coarse aggregate, and M2 is the mass of the microcrystalline glass coarse aggregate after air drying.

[0071] 2. The compressive strength of the microcrystalline glass aggregate concrete prepared in this embodiment was tested according to the "Standard for Testing and Evaluation of Concrete Strength" (GB / T 50107-2010).

[0072] The test results for the above technical indicators are as follows: water absorption rate = 0.04%, compressive strength = 53.26 MPa.

[0073] Example 6

[0074] A process for preparing microcrystalline glass aggregate concrete includes the following steps:

[0075] (1) The blocky microcrystalline glass is crushed into aggregate, and then the aggregate with a particle size of 10~20mm is screened out. It is mixed with a 3% sodium hydroxide solution at a ratio of 1g:15ml and stirred evenly. Then it is heated to 50℃ and kept at the temperature for 6 hours for activation treatment. After completion, the obtained coarse aggregate is added to the reaction vessel with saturated lime water at a ratio of 1g:25ml. Then it is hydrothermally reacted at 170℃ for 2 hours to obtain the pretreated microcrystalline glass coarse aggregate for later use.

[0076] (2) Take the following raw materials: 415 parts by weight of pretreated microcrystalline glass coarse aggregate, 170 parts by weight of 42.5 ordinary Portland cement, 535 parts by weight of river sand, 20 parts by weight of calcium carbonate powder, and 2.7 parts by weight of polycarboxylate superplasticizer (water reduction rate 27%). Add the above raw materials to the mixer and dry mix for 3 minutes. Then add water at a water-cement ratio of 0.44 and mix evenly to obtain microcrystalline glass aggregate concrete.

[0077] 1. Boil the microcrystalline glass coarse aggregate prepared in this embodiment in a water bath for one hour, remove it, air dry it, and weigh it immediately (the result is accurate to 0.001g). Then calculate the water absorption rate using the following formula: P=(M2-M1) / M1×100%, where: M1 is the initial mass of the microcrystalline glass coarse aggregate, and M2 is the mass of the microcrystalline glass coarse aggregate after air drying.

[0078] 2. The compressive strength of the microcrystalline glass aggregate concrete prepared in this embodiment was tested according to the "Standard for Testing and Evaluation of Concrete Strength" (GB / T 50107-2010).

[0079] The test results for the above technical indicators are as follows: water absorption rate = 0.51%, compressive strength = 58.12 MPa.

[0080] Example 7

[0081] A process for preparing microcrystalline glass aggregate concrete includes the following steps:

[0082] (1) The blocky microcrystalline glass is crushed into aggregate, and then the aggregate with a particle size of 10~20mm is screened out. It is mixed with a 5% sodium hydroxide solution at a ratio of 1g:10ml and stirred evenly. Then it is heated to 60℃ and kept at that temperature for 5 hours for activation treatment. After the activation treatment is completed, the obtained coarse aggregate is drained and placed in a heating furnace. Then it is heated to 630℃ at a heating rate of 10℃ / min and kept at that temperature for 40min. After the activation treatment is completed, it is cooled to room temperature with the furnace to obtain the pretreated microcrystalline glass coarse aggregate for use.

[0083] (2) Take the following raw materials: 460 parts by weight of pretreated microcrystalline glass coarse aggregate, 180 parts by weight of 42.5 ordinary Portland cement, 600 parts by weight of river sand, 25 parts by weight of fly ash, and 3.5 parts by weight of polycarboxylate superplasticizer (water reduction rate 25%). Add the above raw materials to the mixer and dry mix for 3 minutes. Then add water at a water-cement ratio of 0.42 and mix evenly to obtain microcrystalline glass aggregate concrete.

[0084] 1. Boil the microcrystalline glass coarse aggregate prepared in this embodiment in a water bath for one hour, remove it, air dry it, and weigh it immediately (the result is accurate to 0.001g). Then calculate the water absorption rate using the following formula: P=(M2-M1) / M1×100%, where: M1 is the initial mass of the microcrystalline glass coarse aggregate, and M2 is the mass of the microcrystalline glass coarse aggregate after air drying.

[0085] 2. The compressive strength of the microcrystalline glass aggregate concrete prepared in this embodiment was tested according to the "Standard for Testing and Evaluation of Concrete Strength" (GB / T 50107-2010).

[0086] The test results for the above technical indicators are as follows: water absorption rate = 0.07%, compressive strength = 59.63 MPa.

[0087] Example 8

[0088] A process for preparing microcrystalline glass aggregate concrete includes the following steps:

[0089] (1) Basalt fiber and carbon powder are mixed in a ratio of 1 part by weight: 1.5 parts by weight and stirred evenly. The length of the basalt fiber is 30 mm. The resulting mixture is then placed in a heating furnace with nitrogen as the protective atmosphere. The temperature is raised to 800°C at a heating rate of 10°C / min and held for 10 min. After that, the temperature is lowered to 700°C and held for 10 min. After that, air is introduced to replace the protective atmosphere and the temperature is held for another 30 min. Then, the mixture is cooled to room temperature. The resulting chopped basalt fiber is washed with water and then placed in an oven and dried at 100°C for 60 min to obtain the modified fiber.

[0090] (2) Take the following raw materials: 490 parts by weight of the pretreated microcrystalline glass coarse aggregate of Example 4 above, 200 parts by weight of 42.5 ordinary silicate cement, 610 parts by weight of river sand, 30 parts by weight of glass powder, 4 parts by weight of polycarboxylate superplasticizer (water reduction rate 25%), and 25 parts by weight of modified fiber of this example. Add the above raw materials to the mixer and dry mix for 3 minutes, then add water according to the water-cement ratio of 0.4 and mix evenly to obtain microcrystalline glass aggregate concrete.

[0091] The compressive strength of the microcrystalline glass aggregate concrete prepared in this embodiment was tested according to the "Standard for Testing and Evaluation of Concrete Strength" (GB / T 50107-2010), and the result was 65.91 MPa.

[0092] Example 9

[0093] A process for preparing microcrystalline glass aggregate concrete includes the following steps:

[0094] (1) Basalt fiber, carbon powder, and silica powder are mixed in a ratio of 1 part by weight: 3 parts by weight: 0.45 parts by weight and stirred evenly. The length of the basalt fiber is 20 mm. The resulting mixture is then placed in a heating furnace with nitrogen as the protective atmosphere. The temperature is raised to 745°C at a heating rate of 10°C / min and held for 5 min. After that, the temperature is lowered to 685°C and held for 20 min. After that, air is introduced to replace the protective atmosphere and the temperature is held for another 25 min. Then, the mixture is cooled to room temperature. The resulting chopped basalt fiber is washed with water and then placed in an oven and dried at 150°C for 45 min to obtain the modified fiber.

[0095] (2) Take the following raw materials: 470 parts by weight of the pretreated microcrystalline glass coarse aggregate of Example 3 above, 190 parts by weight of 42.5 ordinary Portland cement, 620 parts by weight of river sand, 25 parts by weight of silica fume, 3.5 parts by weight of polycarboxylate superplasticizer (water reduction rate 20%), and 17 parts by weight of modified fiber of this example. Add the above raw materials to the mixer and dry mix for 3 minutes, then add water according to the water-cement ratio of 0.42 and mix evenly to obtain microcrystalline glass aggregate concrete.

[0096] The compressive strength of the microcrystalline glass aggregate concrete prepared in this embodiment was tested according to the "Standard for Testing and Evaluation of Concrete Strength" (GB / T 50107-2010), and the result was 66.07 MPa.

[0097] 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 microcrystalline glass aggregate concrete, characterized in that, Includes the following steps: (1) The microcrystalline glass is crushed into coarse aggregate, and then the coarse aggregate is placed in an alkaline solution for activation treatment; after completion, the obtained coarse aggregate is mixed with saturated lime water and then subjected to hydrothermal reaction. (2) The coarse aggregate obtained after the hydrothermal reaction is calcined and then cooled to room temperature to obtain pretreated microcrystalline glass coarse aggregate for later use. (3) Take the following raw materials: 415~490 parts by weight of the pretreated microcrystalline glass coarse aggregate, 170~200 parts by weight of silicate cement, 535~620 parts by weight of river sand, 20~30 parts by weight of inorganic filler, 2.7~4 parts by weight of water-reducing agent, and the water-cement ratio is 0.40~0.44; mix the above raw materials and stir evenly to obtain microcrystalline glass aggregate concrete.

2. The preparation process of microcrystalline glass aggregate concrete according to claim 1, characterized in that, In step (1), the ratio of coarse aggregate to alkali solution is 1g: 5~15ml.

3. The preparation process of microcrystalline glass aggregate concrete according to claim 1, characterized in that, In step (1), the alkaline solution includes either sodium hydroxide solution or potassium hydroxide solution.

4. The preparation process of microcrystalline glass aggregate concrete according to claim 2, characterized in that, In step (1), the mass fraction of the alkaline solution is 3-5%.

5. The preparation process of microcrystalline glass aggregate concrete according to claim 1, characterized in that, In step (1), the activation treatment takes 4 to 6 hours.

6. The preparation process of microcrystalline glass aggregate concrete according to claim 1, characterized in that, In step (1), the activation treatment temperature is 50~65℃.

7. The preparation process of microcrystalline glass aggregate concrete according to claim 1, characterized in that, In step (1), the ratio of coarse aggregate to saturated lime water is 1g: 20~30ml.

8. The preparation process of microcrystalline glass aggregate concrete according to claim 1, characterized in that, In step (1), the temperature of the hydrothermal reaction is 160~200℃ and the reaction time is 1.5~2 hours.

9. The preparation process of microcrystalline glass aggregate concrete according to claim 1, characterized in that, In step (2), the calcination temperature is 600~650℃ and the time is 30~45min.

10. The preparation process of microcrystalline glass aggregate concrete according to claim 1, characterized in that, In step (3), the inorganic filler includes at least one of fly ash, silica fume, calcium carbonate powder, glass powder, and silica powder.

11. The preparation process of microcrystalline glass aggregate concrete according to claim 1, characterized in that, In step (3), the water-reducing agent includes any one of polycarboxylate water-reducing agent, naphthalene-based water-reducing agent, and lignin sulfonate water-reducing agent.

12. The preparation process of microcrystalline glass aggregate concrete according to claim 1, characterized in that, In step (3), the water reduction rate of the water-reducing agent is 20-27%.

13. The preparation process of microcrystalline glass aggregate concrete according to any one of claims 1-12, characterized in that, In step (3), the raw materials also include 17-25 parts by weight of modified fiber; the modified fiber is prepared by the following method: short basalt fiber, carbon powder and glass powder are mixed evenly in a ratio of 1 part by weight: 1.5-3 parts by weight: 0.35-0.45 parts by weight, and then the mixture is heated to 745°C in an oxygen-free protective atmosphere and kept at that temperature; after completion, the temperature is lowered to 685°C and kept at that temperature, and then air is used to replace the protective atmosphere to continue the heat preservation, and then the mixture is cooled to room temperature. The obtained basalt fiber is washed and dried to obtain the modified fiber.

14. The preparation process of microcrystalline glass aggregate concrete according to claim 13, characterized in that, The length of the chopped basalt fibers is 20~30mm.

15. The preparation process of microcrystalline glass aggregate concrete according to claim 13, characterized in that, The glass powder has a fineness of 100-150 mesh.

16. The preparation process of microcrystalline glass aggregate concrete according to claim 13, characterized in that, The protective atmosphere includes either nitrogen or argon.

17. The preparation process of microcrystalline glass aggregate concrete according to claim 13, characterized in that, After replacing the protective atmosphere with air, continue to keep warm for at least 25 minutes.

18. The preparation process of microcrystalline glass aggregate concrete according to claim 13, characterized in that, After washing the basalt fiber with clean water to remove residual ash, drain the water and then dry it at 100~150℃ for 45~60 minutes.

Images