Residue soil autoclaved brick curing agent, residue soil autoclaved brick and method

Abstract

The invention discloses a muck autoclaved brick curing agent, a muck autoclaved brick and a method, and belongs to the technical field of building materials. The muck autoclaved brick curing agent comprises the following components in percentage by weight: 30%-40% of a cementing material, 30%-50% of an industrial solid waste active agent, 5%-10% of a reinforcing agent, 5%-10% of an exciting agent, 1%-5% of an early strength agent and 1%-5% of a silane coupling agent. The muck autoclaved brick curing agent prepared by the invention is simple in preparation process, good in curing effect, high in later strength and obvious in economic benefit; according to the muck autoclaved brick prepared by the invention, the dosage of the cementing material can be effectively reduced, the dosage of the cementing material can be reduced by more than 50% by adding the curing agent with the same dosage, the produced muck autoclaved brick has higher compressive strength and water absorption, and each performance reaches or exceeds the existing national standard; according to the muck autoclaved brick curing agent, common industrial solid waste can be utilized, and comprehensive utilization of waste resources is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a slag autoclaved brick curing agent and a preparation method thereof, and a slag autoclaved brick based on the slag autoclaved brick curing agent and a preparation method thereof. Background Art

[0002] With the acceleration of urbanization, the amount of construction waste is increasing. Traditional treatment methods such as landfill not only occupy a large amount of land resources, but also may cause environmental pollution. Therefore, using construction waste to produce autoclaved bricks has become a sustainable solution. However, the current construction waste autoclaved bricks still have some shortcomings in terms of strength, durability, water absorption, etc. It is necessary to develop an effective curing agent and an optimized production process to improve the performance of construction waste autoclaved bricks. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects in the prior art and provide a slag autoclaved brick curing agent and slag autoclaved brick and method.

[0004] The specific technical solutions adopted by the present invention are as follows:

[0005] In a first aspect, the present invention provides a slag autoclaved brick curing agent, which includes, by weight, 30% to 40% of a cementitious material, 30% to 50% of an industrial solid waste activator, 5% to 10% of a reinforcing agent, 5% to 10% of an activator, 1% to 5% of an early strength agent and 1% to 5% of a silane coupling agent.

[0006] Preferably, the cementitious material is at least one of cement, lime and carbide slag.

[0007] Preferably, the industrial solid waste activator is at least one of fly ash, slag and slag powder.

[0008] Preferably, the reinforcing agent is at least one of silica fume, quartz powder and nano-silicon dioxide.

[0009] Preferably, the activator is at least one of sodium hydroxide, potassium hydroxide, sodium silicate and sodium aluminate.

[0010] Preferably, the early strength agent is a mixture of sodium sulfate and triethanolamine in a weight ratio of 2:1.

[0011] Preferably, the silane coupling agent is at least one of vinyl silane, amino silane and methacryloxy silane.

[0012] In a second aspect, the present invention provides a method for preparing slag autoclaved bricks, which is as follows:

[0013] S1: According to the weight ratio, 65% of slag, 15% of the slag autoclaved brick curing agent as described in any one of the first aspects and 20% of fine aggregate are mixed and water is added to stir evenly to form a mixture;

[0014] S2: The mixed material is pressed into shape by a static pressure preparation method, and the molding pressure is 20 MPa;

[0015] S3: curing the formed bricks by autoclaving at a temperature of 160-240° C. and a pressure of 1.0-1.6 MPa for 4-8 hours to obtain slag autoclaved bricks.

[0016] Preferably, the mixture is obtained by method one or method two;

[0017] The method 1 is specifically as follows:

[0018] According to the weight ratio, 65% of slag and 15% of slag autoclaved brick curing agent are stirred at a stirring rate of 150-200 rpm for 5 minutes, and then 20% of fine aggregate is added and stirred at a stirring rate of 150-200 rpm until uniformly mixed; the obtained product and water are mixed at a water-to-material ratio of 0.12, and stirred at a stirring rate of 300-350 rpm for 8 minutes to obtain a mixture;

[0019] The second method is as follows:

[0020] The slag autoclaved brick curing agent is divided into a solid curing agent and a liquid curing agent, wherein the solid curing agent comprises a gelling material, an industrial solid waste activator and a reinforcing agent, and the liquid curing agent comprises an activator, an early strength agent and a silane coupling agent;

[0021] According to the weight ratio, 65% of the slag and 12% of the solid curing agent are stirred at a stirring rate of 150-200 rpm for 5 minutes, and then 20% of the fine aggregate is added and stirred at a stirring rate of 150-200 rpm until uniformly mixed to obtain a pre-mixed material; the liquid curing agent and water are mixed at a water-to-material ratio of 0.12, and then added to the pre-mixed material, and stirred at a stirring rate of 300-350 rpm for 8 minutes to obtain a mixture.

[0022] In a third aspect, the present invention provides a slag autoclaved brick obtained by the preparation method described in the second aspect.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The curing agent prepared by the present invention can utilize industrial solid waste to replace a part of the cementitious materials, which not only consumes and disposes of the industrial solid waste, but also saves the consumption of cementitious materials such as cement and lime, and has high economic benefits.

[0025] 2. The curing agent prepared by the present invention can be used for uniform stirring between fine powders, effectively preventing agglomeration of the fine powders when mixed, making the curing agent more evenly distributed in the slag and reacting more fully during the autoclaving process.

[0026] 3. The curing agent prepared by the present invention can give full play to the overall advantages of the curing agent from the mixing stage, the initial curing stage, and the later autoclaving stage, compared with the curing agent that only participates in the autoclaving reaction, participates in the entire process, and has a more excellent effect.

[0027] 4. The curing agent prepared by the present invention can effectively improve the strength and durability of slag autoclaved bricks and reduce the water absorption rate when used in the same amount as cement, so that it meets the requirements of construction projects.

[0028] 5. The present invention utilizes slag to produce autoclaved bricks, thus realizing resource utilization of waste and reducing pollution to the environment.

[0029] 6. The production process of the present invention is simple, easy to operate, and suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 These are SEM images of the slag autoclaved bricks obtained in Example 1 at different magnifications. DETAILED DESCRIPTION

[0031] The present invention is further described and illustrated below in conjunction with the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly without conflicting with each other.

[0032] The present invention provides a slag autoclaved brick curing agent, comprising 30% to 40% of cementitious material, 30% to 50% of industrial solid waste activator, 5% to 10% of reinforcing agent, 5% to 10% of activator, 1% to 5% of early strength agent and 1% to 5% of silane coupling agent in percentage by weight. In actual use, the components in the curing agent with different particle gradations are adjusted and configured within the above proportions.

[0033] As a preferred embodiment of the present invention, the cementitious material is one or more combinations of cement, lime, and carbide slag. In actual use, a mixture of cement and slaked lime (carbide slag) is preferably used as the cementitious material. Specifically, the mixing mass ratio of cement and slaked lime is 6:4. Under this compounding condition, calcium silicate hydrate and tobermorite crystal structures can be produced during the reaction. The strip crystal structure and the plate crystal structure are intertwined, which increases the various properties of the slag autoclaved brick.

[0034] As a preferred embodiment of the present invention, the industrial solid waste activator is one or a combination of fly ash, slag, and slag powder. In actual use, the particle size of the industrial solid waste activator should be less than 300 meshes. The industrial solid waste activator can utilize industrial solid waste on the one hand, and improve the activity of the curing agent on the other hand.

[0035] As a preferred embodiment of the present invention, the reinforcing agent is one or more combinations of silica fume, quartz powder, and nano silicon dioxide. In actual use, it is preferred to use a composite product of nano silicon dioxide and silica fume and / or quartz powder, and the silicon dioxide content in the composite material should be greater than 95%. The particle size of the reinforcing agent is less than 400 meshes, and the addition of the reinforcing agent can enhance the strength and durability of the slag autoclaved brick.

[0036] As a preferred embodiment of the present invention, the activator is one or more of sodium hydroxide (NaOH), potassium hydroxide (KOH), sodium silicate (water glass, Na2SiO3), sodium aluminate (Na2Al2O3). In actual use, it is preferred to use a composite component of sodium hydroxide, potassium hydroxide, sodium silicate, and sodium aluminate, wherein the content of sodium hydroxide and potassium hydroxide should be greater than 97%, the modulus of water glass is 2.8-3.5, and the modulus of sodium aluminate is 1.05-1.5. The activator can promote the reaction between the components.

[0037] As a preferred embodiment of the present invention, the early strength agent is a mixture of sodium sulfate and triethanolamine in a weight ratio of 2: 1. In the early strength agent, triethanolamine can not only prevent the powder from agglomerating during the mixing process, making the mixture more uniform, but also has greater viscosity and a certain cementing effect; sodium sulfate can accelerate the formation of calcium sulfoaluminate, a cement hydration product, and accelerate the water hardening speed, thereby also improving the formation of hydrated calcium silicate.

[0038] As a preferred embodiment of the present invention, the silane coupling agent is one or a combination of vinyl silane, amino silane, and methacryloxy silane. In actual use, the silane coupling agent can improve the interface properties of the material, enhance the material properties, and strengthen the bonding strength.

[0039] Based on the above-mentioned slag autoclaved brick curing agent, the present invention also provides a method for preparing slag autoclaved bricks, and the preparation method is specifically as follows:

[0040] S1: According to the weight ratio, 65% of slag, 15% of the slag autoclaved brick curing agent of the present invention and 20% of fine aggregate are mixed and water is added and stirred to form a mixture;

[0041] S2: The mixed material is pressed into shape by a static pressure preparation method, and the molding pressure is 20 MPa;

[0042] S3: curing the formed bricks by autoclaving at a temperature of 160-240° C. and a pressure of 1.0-1.6 MPa for 4-8 hours to obtain slag autoclaved bricks.

[0043] As a preferred embodiment of the present invention, the mixed material can be obtained by way 1 or way 2:

[0044] Method 1 is as follows:

[0045] According to the weight ratio, 65% of slag and 15% of slag autoclaved brick curing agent are stirred at a stirring rate of 150-200 rpm for 5 minutes, and then 20% of fine aggregate is added and stirred at a stirring rate of 150-200 rpm until uniformly mixed; the resulting product and water are mixed at a water-to-material ratio of 0.12, and stirred at a stirring rate of 300-350 rpm for 8 minutes to obtain a mixture.

[0046] When the method 1 is adopted, the preparation method of the slag autoclaved brick is as follows:

[0047] According to the weight ratio, 30% to 40% of cementitious material, 30% to 50% of industrial solid waste active agent, 5% to 10% of reinforcing agent, 5% to 10% of activator, 1% to 5% of early strength agent and 1% to 5% of silane coupling agent are added into a mixer in sequence, and stirred evenly at a speed of 300 rpm to obtain a slag autoclaved brick curing agent; 65% of slag and 15% of slag autoclaved brick curing agent are stirred at a stirring speed of 150 to 200 rpm for 5 minutes, and then added 20% of fine aggregate is added and stirred at a stirring rate of 150-200 rpm until uniformly mixed; the obtained product is mixed with water at a water-to-material ratio of 0.12, and stirred at a stirring rate of 300-350 rpm for 8 minutes to obtain a mixture; the mixture is pressed into shape by a static pressure preparation method at a molding pressure of 20 MPa; the molded bricks are autoclaved and cured at a temperature of 180°C and a pressure of 1.2 MPa for 8 hours to obtain slag autoclaved bricks.

[0048] Method 2 mainly involves adding the slag autoclaved brick curing agent in the form of solid-liquid separation, as follows:

[0049] The slag autoclaved brick curing agent is divided into a solid curing agent and a liquid curing agent. Among them, the solid curing agent includes a cementitious material, an industrial solid waste activator and a reinforcing agent, and the liquid curing agent includes an activator, an early strength agent and a silane coupling agent. According to the weight ratio, 65% of the slag and 12% of the solid curing agent are stirred at a stirring rate of 150 to 200 rpm for 5 minutes, and then 20% of the fine aggregate is added and stirred at a stirring rate of 150 to 200 rpm until uniformly mixed to obtain a pre-mixed material; the liquid curing agent is mixed with water at a water-to-material ratio of 0.12, and then added to the pre-mixed material, and stirred at a stirring rate of 300 to 350 rpm for 8 minutes to obtain a mixture.

[0050] When the second method is adopted, the preparation method of the slag autoclaved brick is as follows:

[0051] According to the weight ratio, 30% to 40% of the cementitious material, 30% to 50% of the industrial solid waste active agent, and 5% to 10% of the reinforcing agent are sequentially added into a mixer, and stirred evenly at a stirring rate of 200 rpm to form a solid curing agent; according to the weight ratio, 5% to 10% of the activator, 1% to 5% of the early strength agent, and 1% to 5% of the silane coupling agent are sequentially added into water in proportion, and stirred evenly at a stirring rate of 150 rpm to form a liquid curing agent; 65% of the slag and 12% of the solid curing agent are stirred at a stirring rate of 200 rpm for 5 minutes, and then 20% of the fine aggregate is added and stirred at a stirring rate of 200 rpm until uniformly mixed to obtain a pre-mixed material; the liquid curing agent is mixed with water at a water-to-material ratio of 0.12, and then added into the pre-mixed material, and stirred at a stirring rate of 350 rpm for 8 minutes to obtain a mixture. The mixture is pressed into shape by a static pressure preparation method at a molding pressure of 20 MPa; the molded bricks are autoclaved and cured at a temperature of 180°C and a pressure of 1.2 MPa for 8 hours to obtain slag autoclaved bricks.

[0052] In the preparation method of the present invention, when the moisture content of the raw material slag is high and no water needs to be added during the actual production process, method one is applicable, mainly because it is not suitable to add water under high moisture content conditions. When too much water is added, the forming performance of the slag autoclaved brick will be reduced; when the moisture content of the raw material slag is low and a certain amount of water needs to be added during the production process, method two is applicable.

[0053] The effects of the method of the present invention and the resulting products will be specifically described below by way of examples.

[0054] Example 1

[0055] The composition of the slag autoclaved brick curing agent used in this embodiment is (calculated in percentage by weight): 24 parts of cement, 16 parts of carbide slag, 15 parts of fly ash, 22 parts of slag, 8 parts of silica fume, 3 parts of sodium hydroxide, 6 parts of water glass, 2 parts of sodium sulfate, 1 part of triethanolamine, and 3 parts of vinyl silane.

[0056] The specific method of the production process of slag autoclaved bricks in this embodiment is as follows (i.e., method 1 is adopted):

[0057] S1: Add cementitious materials (24 parts of cement, 16 parts of carbide slag), industrial solid waste activator (15 parts of fly ash, 22 parts of slag), reinforcing agent (8 parts of silica fume), activator (3 parts of sodium hydroxide, 6 parts of water glass), early strength agent (2 parts of sodium sulfate, 1 part of triethanolamine), silane coupling agent (3 parts of vinyl silane) into a mixer in sequence and stir quickly and evenly to form a slag autoclaved brick curing agent.

[0058] S2: Mix 65 parts of slag, 20 parts of fine aggregate, and 15 parts of slag autoclaved brick curing agent according to the weight ratio of the above raw materials and curing agent.

[0059] S3: Add the slag and slag autoclaved brick curing agent into the mixer first, stir at a stirring rate of 200 rpm for 5 min, then add the fine aggregate into the mixer and stir evenly.

[0060] S4: Add water and the product obtained in S3 into a mixer at a water-to-material ratio of 0.12, and stir at a speed of 350 rpm for 8 minutes to form a mixture.

[0061] S5: The mixture is prepared by static pressing and the molding pressure is 20 MPa.

[0062] S6: The formed bricks are autoclaved and cured at a temperature of 180°C and a pressure of 1.2 MPa for 8 hours to form the final product.

[0063] Example 2

[0064] The production process of this embodiment is the same as that of embodiment 1, except that: the autoclaved slag curing agent for slag bricks contains 0 parts of carbide slag and 16 parts of lime. That is, the autoclaved slag brick curing agent used in this embodiment contains (calculated by percentage weight): 24 parts of cement, 16 parts of lime, 15 parts of fly ash, 22 parts of slag, 8 parts of silica fume, 3 parts of sodium hydroxide, 6 parts of water glass, 2 parts of sodium sulfate, 1 part of triethanolamine, and 3 parts of vinyl silane.

[0065] Example 3

[0066] The production process of this embodiment is the same as that of embodiment 1, except that: the slag autoclaved brick curing agent contains 0 parts of fly ash and 40 parts of slag. That is, the slag autoclaved brick curing agent used in this embodiment contains (calculated by percentage weight): 24 parts of cement, 16 parts of carbide slag, 37 parts of slag, 8 parts of silica fume, 3 parts of sodium hydroxide, 6 parts of water glass, 2 parts of sodium sulfate, 1 part of triethanolamine, and 3 parts of vinyl silane.

[0067] Example 4

[0068] The production process of this embodiment is the same as that of embodiment 1, except that: the slag autoclaved brick curing agent contains 40 parts of fly ash and 0 parts of slag. That is, the slag autoclaved brick curing agent used in this embodiment contains (calculated by percentage weight): 24 parts of cement, 16 parts of calcium carbide slag, 37 parts of fly ash, 8 parts of silica fume, 3 parts of sodium hydroxide, 6 parts of water glass, 2 parts of sodium sulfate, 1 part of triethanolamine, and 3 parts of vinyl silane.

[0069] Example 5

[0070] The production process of this embodiment is the same as that of embodiment 1, except that: the slag autoclaved brick curing agent contains 0 parts of fly ash, 0 parts of slag, and 40 parts of slag powder. That is, the slag autoclaved brick curing agent used in this embodiment contains (calculated by percentage weight): 24 parts of cement, 16 parts of carbide slag, 37 parts of slag powder, 8 parts of silica fume, 3 parts of sodium hydroxide, 6 parts of water glass, 2 parts of sodium sulfate, 1 part of triethanolamine, and 3 parts of vinyl silane.

[0071] Example 6

[0072] The production process of this embodiment is the same as that of embodiment 1, except that: the slag autoclaved brick curing agent contains 0 parts of silica fume and 8 parts of quartz powder. That is, the slag autoclaved brick curing agent used in this embodiment contains (calculated by percentage weight): 24 parts of cement, 16 parts of carbide slag, 15 parts of fly ash, 22 parts of slag, 8 parts of quartz powder, 3 parts of sodium hydroxide, 6 parts of water glass, 2 parts of sodium sulfate, 1 part of triethanolamine, and 3 parts of vinyl silane.

[0073] Example 7

[0074] The production process of this embodiment is the same as that of embodiment 1, except that: the slag autoclaved brick curing agent contains 0 parts of silica fume and 8 parts of nano silicon dioxide. That is, the slag autoclaved brick curing agent used in this embodiment contains (calculated by percentage weight): 24 parts of cement, 16 parts of carbide slag, 15 parts of fly ash, 22 parts of slag, 8 parts of nano silicon dioxide, 3 parts of sodium hydroxide, 6 parts of water glass, 2 parts of sodium sulfate, 1 part of triethanolamine, and 3 parts of vinyl silane.

[0075] Example 8

[0076] The production process of this embodiment is the same as that of embodiment 1, except that: the slag autoclaved brick curing agent contains 6 parts of sodium hydroxide and 3 parts of water glass. That is, the slag autoclaved brick curing agent used in this embodiment contains (calculated by percentage weight): 24 parts of cement, 16 parts of calcium carbide slag, 15 parts of fly ash, 22 parts of slag, 8 parts of silica fume, 6 parts of sodium hydroxide, 3 parts of water glass, 2 parts of sodium sulfate, 1 part of triethanolamine, and 3 parts of vinyl silane.

[0077] Example 9

[0078] The production process of this embodiment is the same as that of embodiment 1, except that: the slag autoclaved brick curing agent contains 3 parts of potassium hydroxide and 6 parts of water glass. That is, the slag autoclaved brick curing agent used in this embodiment contains (calculated by percentage weight): 24 parts of cement, 16 parts of calcium carbide slag, 15 parts of fly ash, 22 parts of slag, 8 parts of silica fume, 3 parts of potassium hydroxide, 6 parts of water glass, 2 parts of sodium sulfate, 1 part of triethanolamine, and 3 parts of vinyl silane.

[0079] Example 10

[0080] The production process of this embodiment is the same as that of embodiment 1, except that: the slag autoclaved brick curing agent contains 6 parts of sodium hydroxide and 3 parts of sodium aluminate. That is, the slag autoclaved brick curing agent used in this embodiment contains (calculated by percentage weight): 24 parts of cement, 16 parts of calcium carbide slag, 15 parts of fly ash, 22 parts of slag, 8 parts of silica fume, 6 parts of sodium hydroxide, 3 parts of sodium aluminate, 2 parts of sodium sulfate, 1 part of triethanolamine, and 3 parts of vinyl silane.

[0081] Embodiment 11

[0082] The production process of this embodiment is the same as that of embodiment 1, except that: the composition of the slag autoclaved brick curing agent contains 0 parts of vinyl silane and 3 parts of aminosilane. That is, the composition of the slag autoclaved brick curing agent used in this embodiment is (calculated by percentage weight): 24 parts of cement, 16 parts of calcium carbide slag, 15 parts of fly ash, 22 parts of slag, 8 parts of silica fume, 3 parts of sodium hydroxide, 6 parts of water glass, 2 parts of sodium sulfate, 1 part of triethanolamine, and 3 parts of aminosilane.

[0083] Example 12

[0084] The curing agent composition and production process of this embodiment are the same as those of embodiment 1, except that: the curing agent composition of slag autoclaved bricks includes 70 parts of slag and 10 parts of curing agent. That is, in the specific method of the production process of slag autoclaved bricks in this embodiment, S2 is: 70 parts of slag, 20 parts of fine aggregate, and 10 parts of slag autoclaved brick curing agent are mixed according to the weight ratio of the above raw materials and curing agent.

[0085] Embodiment 13

[0086] The curing agent composition and production process of this embodiment are the same as those of embodiment 1, except that in production process S2, there are 60 parts of slag and 20 parts of curing agent. That is, in the specific method of the production process of slag autoclaved bricks in this embodiment, S2 is: 60 parts of slag, 20 parts of fine aggregate, and 20 parts of slag autoclaved brick curing agent are mixed according to the weight ratio of the above raw materials and curing agent.

[0087] Embodiment 14

[0088] The composition of the slag autoclaved brick curing agent used in this embodiment is (calculated in percentage by weight): 24 parts of cement, 16 parts of carbide slag, 15 parts of fly ash, 22 parts of slag, 8 parts of silica fume, 3 parts of sodium hydroxide, 6 parts of water glass, 2 parts of sodium sulfate, 1 part of triethanolamine, and 3 parts of vinyl silane.

[0089] The specific method of the production process of slag autoclaved bricks in this embodiment is as follows (i.e., method 2 is adopted):

[0090] S1: Add cementitious materials (24 parts of cement, 16 parts of carbide slag), industrial solid waste activator (15 parts of fly ash, 22 parts of slag), and reinforcing agent (8 parts of silica fume) into a mixer in sequence, and stir evenly at a stirring rate of 200 rpm to form a solid curing agent.

[0091] S2: Add an activator (3 parts of sodium hydroxide and 6 parts of water glass), an early strength agent (2 parts of sodium sulfate and 1 part of triethanolamine), and a silane coupling agent (3 parts of vinyl silane) into water, and stir evenly at a stirring rate of 150 rpm to form a liquid curing agent.

[0092] S3: 65 parts of slag and 12 parts of solid curing agent were stirred at a stirring rate of 200 rpm for 5 min, and then 20 parts of fine aggregate were added and stirred at a stirring rate of 200 rpm until uniformly mixed to obtain a pre-mixed material.

[0093] S4: The liquid curing agent was mixed with water at a water-to-material ratio of 0.12, and then added to the prepared mixture, and stirred at a stirring rate of 350 rpm for 8 minutes to obtain a mixture.

[0094] S5: The mixed material is pressed into a shape by a static pressure preparation method, and the molding pressure is 20 MPa.

[0095] S6: autoclave the formed bricks at a temperature of 180° C. and a pressure of 1.2 MPa for 8 hours to obtain slag autoclaved bricks.

[0096] Comparative Example 1

[0097] The production process of this comparative example is the same as that of Example 1, except that the curing agent component of the slag autoclaved brick is cement.

[0098] Comparative Example 2

[0099] The production process of this comparative example is the same as that of Example 1, except that the curing agent component of the slag autoclaved brick is lime.

[0100] Comparative Example 3

[0101] The production process of this comparative example is the same as that of Example 1, except that no industrial solid waste activator 0 is added to the slag autoclaved brick curing agent.

[0102] Comparative Example 4

[0103] The production process of this comparative example is the same as that of Example 1, except that no reinforcing agent is added to the slag autoclaved brick curing agent.

[0104] Comparative Example 5

[0105] The production process of this comparative example is the same as that of Example 1, except that no activator is added to the slag autoclaved brick curing agent.

[0106] Comparative Example 6

[0107] The production process of this comparative example is the same as that of Example 1, except that no early strength agent is added to the slag autoclaved brick curing agent.

[0108] Comparative Example 7

[0109] The production process of this comparative example is the same as that of Example 1, except that no silane coupling agent is added to the slag autoclaved brick curing agent.

[0110] The performance results of the slag autoclaved bricks prepared in the above examples and comparative examples are shown in Table 1 below.

[0111] Table 1 Performance of slag autoclaved bricks in embodiments and comparative examples

[0112]

[0113]

[0114] Through the above experiments, it can be found that from Examples 1 to 13, the slag autoclaved bricks prepared by using various curing agent components in the present invention have good performance, and the performance is much improved compared to the minimum national standard.

[0115] By comparing Example 1 and Example 14, it can be seen that the performance of the slag autoclaved brick prepared by Method 2 is slightly better than that of Method 1. This is because in Method 2, the activator, early strength agent, and silane coupling agent are first mixed with water, and then further mixed with the raw materials through water. During the rapid stirring process, the water is easier to mix evenly with the remaining raw materials, ensuring that the reaction is more stable. In Method 1, since the amount of activator, early strength agent, silane coupling agent, etc. added is relatively small, mixing uniformity is better when mixed with water.

[0116] By comparing Example 1 with Comparative Example 1 and Comparative Example 2, it can be seen that in the slag autoclaved brick system, by comparing the use of cementitious materials (cement, lime) alone with the use of the curing agent of the present invention to prepare slag autoclaved bricks, it can be seen that under the same ratio, the compressive strength can be increased by about 35%, the water absorption rate can be reduced by more than 30%, and the overall performance of the bricks is improved, which shows that the curing agent of the present invention can not only reduce the amount of cementitious materials such as cement and lime, reduce the cost of raw materials, but also can utilize industrial solid waste and improve the level of comprehensive resource utilization.

[0117] By comparing Example 1 with Comparative Example 3, it can be seen that the addition of industrial solid waste active agent can effectively reduce the amount of cementitious material, but the various properties of slag autoclaved bricks do not change much.

[0118] By comparing Example 1 with Comparative Example 4, it can be seen that the addition of the reinforcing agent can improve the compressive strength of the slag autoclaved brick. This is because the reinforcing agent has a high content of active silica, which can participate in the reaction to generate tobermorite.

[0119] By comparing Example 1 with Comparative Example 5, it can be seen that the addition of the alkali activator can effectively improve the performance of the slag autoclaved brick, and the activity of silicon and aluminum in the slag can be stimulated by the alkali activation, thereby improving the degree of reaction.

[0120] By comparing Example 1 with Comparative Example 6, it can be seen that the addition of the early strength agent can make the curing agent disperse more evenly, and the later strength can be increased by about 10%.

[0121] By comparing Example 1 with Comparative Example 7, it can be seen that the addition of silane coupling agent can wrap the surface of the slag to form a thin film to prevent the entry of moisture, thereby improving the water release performance of the slag autoclaved brick.

[0122] In the present invention, the curing agent modification principle is characterized as follows:

[0123] After the curing agent in the present invention is homogenized and mixed with the solidifying object slag, it firstly plays a wrapping and modifying role on the curing agent. The curing agent is dispersed between the slag particles. By adding water, the slag particles can be effectively wrapped, the surface structure of the slag is changed, the surface hydrophobicity is increased, and it is not easy for water to enter the molecular structure of the slag; secondly, it has a better dispersing effect. By wrapping and lubricating cement, slag fine aggregates, etc. through triethanolamine, it is not easy to aggregate when mixed with slag, and the fluidity is improved; thirdly, it performs a hydration effect. The cementitious material cement undergoes a hydration reaction under the action of water. Calcium silicate hydrate and calcium hydroxide are generated. Calcium silicate hydrate makes the interior of the slag autoclaved brick have a bonding effect; then hydrothermal curing is carried out. The calcium hydroxide in the hydrated cement and the raw materials will react with the silicon and aluminum elements in the slag under high temperature and high pressure to form tobermorite with higher strength, which transforms the slag from granular to rock-like; finally, chemical reaction is carried out. The activity of silicon and aluminum in the slag is stimulated by alkaline activators, the reaction intensity is increased, and the strip-like calcium silicate hydrate and flaky tobermorite structures generated by hydration and hydrothermal reactions are bonded together, thereby improving the various properties of the slag autoclaved brick.

[0124] Traditional slag autoclaved bricks that use cement and lime as curing agents have a higher water absorption rate and poorer frost resistance. They are more likely to lose strength under the action of water, so bricks cannot have places where more water molecules flow. This is because the flow of water molecules can easily enter the interior of the bricks, destroying the bonding effect in the internal structure, forming internal gaps, and reducing the compressive strength. If freezing occurs in winter, it is easier to destroy the strength of the bricks and reduce their service life.

[0125] After adding the curing agent of the present invention, the curing agent will not only wrap the surface of the bricks to reduce the entry of moisture, but also participate in various reactions of the raw materials, thereby improving the strength of the bricks. The traditional slag autoclaved bricks can be used as a high-value building material. Figure 1 This is a scanning electron microscope picture of the slag autoclaved brick after adding the curing agent. It can be seen that after adding the curing agent, the calcium silicate and tobermorite inside the slag autoclaved brick are alternately distributed, the combination is tighter, and the internal structure is evenly distributed. This also shows that the dispersibility of the curing agent is better, so that all the performances of the slag autoclaved brick can be improved.

[0126] The slag autoclaved brick curing agent prepared by the invention has simple preparation process, good curing effect, high later strength and obvious economic benefit; the slag autoclaved brick prepared by the invention can effectively reduce the amount of cementitious material, and adding the same amount of curing agent can reduce the amount of cementitious material by more than 50%. The produced slag autoclaved brick has higher compressive strength and water absorption rate, and various performances reach or exceed the existing national standards; the slag autoclaved brick curing agent of the invention can utilize general industrial solid waste to realize comprehensive utilization of waste resources.

[0127] The above-described embodiment is only a preferred solution of the present invention, but it is not intended to limit the present invention. A person skilled in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A slag autoclaved brick curing agent, characterized in that: The invention comprises, by weight, 30% to 40% of a cementitious material, 30% to 50% of an industrial solid waste activator, 5% to 10% of a reinforcing agent, 5% to 10% of an activator, 1% to 5% of an early strength agent and 1% to 5% of a silane coupling agent.

2. The slag autoclaved brick curing agent according to claim 1, characterized in that: The cementitious material is at least one of cement, lime and carbide slag.

3. The slag autoclaved brick curing agent according to claim 1, characterized in that: The industrial solid waste activator is at least one of fly ash, slag, and slag powder.

4. The slag autoclaved brick curing agent according to claim 1, characterized in that: The reinforcing agent is at least one of silica fume, quartz powder and nano silicon dioxide.

5. The slag autoclaved brick curing agent according to claim 1, characterized in that: The activator is at least one of sodium hydroxide, potassium hydroxide, sodium silicate and sodium aluminate.

6. The slag autoclaved brick curing agent according to claim 1, characterized in that: The early strength agent is a mixture of sodium sulfate and triethanolamine in a weight ratio of 2:

1.

7. The slag autoclaved brick curing agent according to claim 1, characterized in that: The silane coupling agent is at least one of vinyl silane, amino silane and methacryloxy silane.

8. A method for preparing slag autoclaved bricks, characterized in that: The details are as follows: S1: According to the weight ratio, 65% of slag, 15% of the slag autoclaved brick curing agent according to any one of claims 1 to 7 and 20% of fine aggregate are mixed and water is added to stir evenly to form a mixture; S2: The mixed material is pressed into shape by a static pressure preparation method, and the molding pressure is 20 MPa; S3: curing the formed bricks by autoclaving at a temperature of 160-240° C. and a pressure of 1.0-1.6 MPa for 4-8 hours to obtain slag autoclaved bricks.

9. The method for preparing slag autoclaved bricks according to claim 8, characterized in that: The mixed material is obtained by method one or method two; The method 1 is specifically as follows: According to the weight ratio, 65% of slag and 15% of slag autoclaved brick curing agent are stirred at a stirring rate of 150-200 rpm for 5 minutes, and then 20% of fine aggregate is added and stirred at a stirring rate of 150-200 rpm until uniformly mixed; the obtained product and water are mixed at a water-to-material ratio of 0.12, and stirred at a stirring rate of 300-350 rpm for 8 minutes to obtain a mixture; The second method is as follows: The slag autoclaved brick curing agent is divided into a solid curing agent and a liquid curing agent, wherein the solid curing agent comprises a gelling material, an industrial solid waste activator and a reinforcing agent, and the liquid curing agent comprises an activator, an early strength agent and a silane coupling agent; According to the weight ratio, 65% of the slag and 12% of the solid curing agent are stirred at a stirring rate of 150-200 rpm for 5 minutes, and then 20% of the fine aggregate is added and stirred at a stirring rate of 150-200 rpm until uniformly mixed to obtain a pre-mixed material; the liquid curing agent and water are mixed at a water-to-material ratio of 0.12, and then added to the pre-mixed material, and stirred at a stirring rate of 300-350 rpm for 8 minutes to obtain a mixture.

10. A slag autoclaved brick obtained by the preparation method according to claim 8.

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