C80 high-performance impermeable concrete and preparation method thereof

Abstract

The application belongs to the technical field of building materials, and particularly relates to C80 high-performance anti-permeability concrete and a preparation method thereof. The C80 high-performance anti-permeability concrete comprises, by weight, 360-700 parts of ordinary Portland cement, 120-180 parts of industrial waste residue material, 800-960 parts of fine aggregate, 700-800 parts of coarse aggregate, 4-14 parts of composite polycarboxylate superplasticizer, 30-50 parts of modified reinforcing filler, 8-10 parts of expanded microspheres and 120-350 parts of water. The industrial waste residue material is a mixture of fly ash, slag and phosphorous slag, and the mass ratio of the fly ash, the slag and the phosphorous slag is 1:(2-3):(1-1.5). The concrete has the characteristics of high strength and strong anti-permeability, and the preparation method is simple to operate and low in production cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building materials, and particularly relates to C80 high-performance anti-permeability concrete and a preparation method thereof. BACKGROUND

[0002] Concrete is an important engineering material indispensable to modern civil engineering, which is formed by mixing cement as a main cementitious material, coarse aggregate, fine aggregate, water, additive agent, etc. according to a certain proportion, stirring, molding, and curing.

[0003] Concrete with a compressive strength of 60 MPa or more is high-strength concrete, which has the advantages of high compressive strength, strong anti-deformation capacity, large density, and low porosity. C80 concrete, as high-strength concrete, is often used in environments such as the bottom of a structure and a basement.

[0004] During the hardening process of concrete, a large amount of hydration heat is generated due to cement hydration, and the higher the strength grade, the greater the hydration heat. The temperature inside the concrete rises sharply, while the surface of the concrete dissipates heat quickly, resulting in a large temperature difference between the inside and outside of the concrete structure layer. This causes different shrinkage rates between the inside and outside of the concrete, leading to cracks on the surface of the concrete and affecting the safety of the building in use. Therefore, it is particularly important to reduce the cracks during the hardening process of concrete. SUMMARY

[0005] One of the purposes of the present application is to provide C80 high-performance anti-permeability concrete, which has the characteristics of high strength and strong anti-permeability.

[0006] The second purpose of the present application is to provide a preparation method of C80 high-performance anti-permeability concrete, which is simple to operate, low in production cost, and high in production efficiency.

[0007] In order to solve the above technical problems of the present application, the present application provides the following technical solutions:

[0008] The first purpose of the present application is to provide C80 high-performance anti-permeability concrete, which comprises the following components by weight:

[0009]

[0010] The industrial waste residue material is a mixture of fly ash, slag, and phosphorous slag, wherein the mass ratio of fly ash, slag, and phosphorous slag is 1:(2-3):(1-1.5).

[0011] Fly ash is a by-product of fine coal powder in the boiler after combustion in coal-fired power plants, which is the largest industrial waste residue in emission, and the main chemical components are SiO2, Al2O3 and Fe2O3, and sometimes it also contains a high CaO; slag is a waste residue discharged from the blast furnace when smelting pig iron, which is composed of silicate and aluminate of CaO, MgO, Al2O3, SiO2, MnO, Fe2O3, etc.; phosphorus slag is an industrial by-product when preparing yellow phosphorus by electric furnace method, and the main chemical components are CaO and SiO2, and the average content is more than 90%, in addition, it also contains a small amount of TiO2, Fe2O3, P2O5, MgO, Na2O, etc., the inventors find that after fly ash, slag and phosphorus slag are added into concrete at a mass ratio of 1:(2-3):(1-1.5), the cement particles can be effectively dispersed, the porosity of the concrete can be reduced, the impermeability and the later concrete strength of the concrete can be improved, and the concrete has good corrosion prevention effect.

[0012] Further, the preparation method of the modified reinforcing filler comprises the following steps:

[0013] S1, uniformly mix silicon carbide, SDS and deionized water at a mass ratio of 5-8:0.001-0.005:90-100, stir at 500-800 rpm at room temperature for 15-20 min; continue to add hollow carbon nanofiber and silane coupling agent, ultrasonic dispersion, vacuum drying at 60-80℃ for 1.5-2.5h to obtain modified hollow carbon nanofiber;

[0014] S2, mix the modified hollow carbon nanofiber and stainless steel short fiber at a mass ratio of 4-6:1 at 500-800 rpm for 8-10 min to obtain the modified reinforcing filler.

[0015] Silicon carbide has stable chemical properties, high thermal conductivity, high strength and high hardness, first mix silicon carbide, SDS and deionized water, SDS makes silicon carbide uniformly suspended and stably dispersed in water to obtain a uniform silicon carbide system; the hollow carbon nanofiber forms a cross-linked network structure through the silane coupling agent, and the silicon carbide is uniformly distributed in the network structure. Hollow carbon nanofiber is a hollow carbon nanofiber, after being added to the concrete, in the early hydration process of the concrete, the silicon carbide attached to the network structure can easily transfer heat to the hollow carbon nanofiber, and the heat is dissipated through the hollow structure of the hollow carbon nanofiber, reducing the hydration heat of the early concrete, and through the network structure of the hollow carbon nanofiber, the generation of cracks is reduced, and the modified reinforcing filler is obtained by cooperating with the use of stainless steel short fiber, which effectively improves the strength and impermeability of the concrete.

[0016] Preferably, the diameter of the stainless steel short fiber is 0.15-0.35mm, and the length is 5-15mm.

[0017] Further, in S1, the mass ratio of silicon carbide, hollow carbon nanofiber and silane coupling agent is 1-3:5-10:0.4-0.6.

[0018] Further, in S1, the ultrasonic frequency of the ultrasonic dispersion is 60-70 kHz, and the ultrasonic time is 50-60 min.

[0019] Further, the composite polycarboxylic acid water reducing agent comprises the following components in parts by weight: polycarboxylic acid mother liquor 35-45 parts, defoaming agent 1-3 parts, slump retaining agent 4-6 parts, air entraining agent 0.3-0.6 parts, and water 140-160 parts.

[0020] The composite polycarboxylic acid water reducing agent can reduce the water content in mixing under the premise of ensuring the slump of concrete, reduce the hydration heat of early concrete, and can be directionally adsorbed on the surface of cement particles in the concrete mixing process, prevent cement particles from gathering through dispersion, reduce the wrapped water to increase the fluidity of the mixture, and improve the strength of the concrete.

[0021] Further, the coarse aggregate is continuously graded gravel.

[0022] The continuously graded gravel makes the coarse aggregate particles present a continuous distribution from large to small, can ensure the dense distribution of particles in the whole concrete, reduce the pores of the concrete, and improve the strength of the concrete.

[0023] Further, the average diameter of the expanded microspheres is 10-50 μm. The expanded microspheres are obtained by ordinary commercial channels, and the inventor finds that the modified reinforcing filler is used in cooperation with the expanded microspheres, which can effectively reduce the cracks in the hardening process of the concrete. The expanded microspheres are a kind of thermoplastic hollow polymer microspheres, which are composed of a thermoplastic polymer shell and an enclosed liquid alkane gas. In the early hydration process of the concrete, part of the hydration heat can be dissipated to the external environment with the hollow carbon nanofiber, and the other part can be absorbed by the expanded microspheres, so that the volume of the expanded microspheres is expanded, the temperature difference between the inside and outside of the concrete is reduced, and the expanded microspheres after thermal expansion can effectively cut off the capillary channel, change the void structure, reduce or eliminate the volume shrinkage caused by drying shrinkage, and improve the impermeability of the concrete.

[0024] The second object of the application is to provide a preparation method of the C80 high-performance impermeable concrete.

[0025] S11, polycarboxylic acid mother liquor 35-45 parts, defoaming agent 1-3 parts, slump retaining agent 4-6 parts, air entraining agent 0.3-0.6 parts, and water 140-160 parts are sequentially added into a container, and stirred and mixed to obtain a composite polycarboxylic acid water reducing agent;

[0026] After the industrial waste residue material is impurity-removed, the material is mixed according to the formula, dried, crushed, ball milled for 50-60 minutes, and sieved through a 2.36mm sieve for standby use;

[0027] S21, 700-800 parts of coarse aggregate, 800-960 parts of fine aggregate and 70% of the total amount of water according to the formula are uniformly mixed to obtain an aggregate mixture;

[0028] S31, in the aggregate mixture obtained in S21, 360-700 parts of ordinary Portland cement, 120-180 parts of industrial waste residue material, 30-50 parts of modified reinforcing filler, 8-10 parts of expanded microspheres and 4-14 parts of the composite polycarboxylate superplasticizer obtained in S11 are added while stirring to obtain a gel mixture;

[0029] S41, in the gel mixture obtained in S31, the remaining 30% of the total amount of water according to the formula is added while stirring to obtain a C80 high-performance impermeable concrete.

[0030] The beneficial effects of the present application are:

[0031] 1. In the concrete, the modified reinforcing filler is added, wherein the silicon carbide has stable chemical properties, high thermal conductivity, high strength and high hardness. First, the silicon carbide, SDS and deionized water are mixed uniformly. The SDS makes the silicon carbide uniformly suspended and stably dispersed in the water to obtain a uniform silicon carbide system. The hollow carbon nanofiber forms a cross-linked network structure through the silane coupling agent, and the silicon carbide is uniformly distributed in the network structure. The hollow carbon nanofiber is a hollow carbon nanofiber. After being added to the concrete, the silicon carbide attached to the network structure can easily transfer heat to the hollow carbon nanofiber during the early hydration process of the concrete. The heat is dissipated through the hollow structure of the hollow carbon nanofiber, reducing the hydration heat of the early concrete. Through the network structure of the hollow carbon nanofiber, the generation of cracks is reduced, and the modified reinforcing filler is obtained by cooperating with the use of stainless steel chopped fiber, effectively improving the strength and impermeability of the concrete.

[0032] 2. The inventor found that the modified reinforcing filler can effectively reduce the occurrence of cracks during the hardening process of the concrete when used with the expanded microspheres. The expanded microspheres are a kind of thermoplastic hollow polymer microspheres, which are composed of a thermoplastic polymer shell and a liquid alkane gas. During the early hydration process of the concrete, part of the hydration heat can be dissipated to the external environment through the hollow carbon nanofiber, and the other part can be absorbed by the expanded microspheres, causing the volume of the expanded microspheres to expand, reducing the temperature difference between the inside and outside of the concrete. The expanded microspheres after heating and expanding can effectively cut off the capillary channel, change the void structure, and at the same time reduce or eliminate the volume shrinkage caused by drying shrinkage, thereby improving the impermeability of the concrete.

[0033] 3、The fly ash, slag, phosphorous slag are added into the concrete according to the mass ratio of 1: (2-3) : (1-1.5), which can effectively disperse the cement particles, reduce the porosity of the concrete, improve the impermeability and the later strength of the concrete, has good corrosion prevention effect, and makes the industrial waste residue materials effectively recycled.

[0034] 4、The industrial waste residue materials, modified reinforcing fillers, expanded microspheres, and composite polycarboxylic acid water reducing agent are used in the application, and a C80 high-performance impermeable concrete is obtained.

[0035] 5、The preparation method of the C80 high-performance impermeable concrete is simple to operate, does not need to use expensive equipment, and has low production cost. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and points of the embodiments of the application more clear, the technical scheme of the application will be described clearly and completely in combination with the specific embodiments of the description.

[0037] In the following examples, the experimental methods are conventional methods unless otherwise specified; and the reagents, materials and the like used in the following examples can be obtained from commercial channels unless otherwise specified.

[0038] The diameter of the stainless steel short-cut fiber used in the following examples and comparative examples is 0.2mm, and the length is 6mm.

[0039] Example 1: Preparation of C80 high-performance impermeable concrete

[0040] Preparation of modified reinforcing fillers:

[0041] S1, 8 parts of silicon carbide, 0.002 parts of SDS and 100 parts of deionized water are uniformly mixed, and stirred at 600rpm for 20min at room temperature; 40 parts of hollow carbon nanofiber and 4 parts of silane coupling agent are continuously added, and ultrasonic dispersion is carried out at 65kHz for 55min, and vacuum drying is carried out at 70℃ for 2h, to obtain modified hollow carbon nanofiber;

[0042] S2, the modified hollow carbon nanofiber and the stainless steel short-cut fiber are mixed according to the mass ratio of 5:1 at 600rpm for 10min, to obtain the modified reinforcing filler.

[0043] A C80 high-performance impermeable concrete comprises the following steps:

[0044] S11, 45 parts of polycarboxylic acid mother liquor, 3 parts of defoaming agent, 6 parts of slump retaining agent, 0.6 parts of air entraining agent, and 160 parts of water are sequentially added into a container and stirred and mixed uniformly to obtain a composite polycarboxylic acid water reducing agent;

[0045] After the industrial waste residue material is removed of impurities, it is mixed according to the mass ratio of fly ash, slag, and phosphorous slag of 1:2.5:1.2, and then dried, crushed, ball milled for 55 min, and passed through a 2.36 mm sieve for standby use;

[0046] S21, 800 parts of coarse aggregate, 960 parts of fine aggregate, and 155 parts of water are mixed uniformly to obtain an aggregate mixture;

[0047] S31, in the aggregate mixture obtained in S21, 680 parts of ordinary Portland cement, 160 parts of industrial waste residue material, 50 parts of modified reinforcing filler, 10 parts of expanded microspheres, and 13 parts of the composite polycarboxylate superplasticizer obtained in S11 are added while stirring, and stirred uniformly to obtain a gel mixture;

[0048] S41, in the gel mixture obtained in S31, 66 parts of water are added while stirring, and stirred uniformly to obtain C80 high-performance impermeable concrete.

[0049] Example 2: Preparation of C80 high-performance impermeable concrete

[0050] Preparation of modified reinforcing filler:

[0051] S1, 6 parts of silicon carbide, 0.003 parts of SDS, and 98 parts of deionized water are mixed uniformly, stirred at 800 rpm at room temperature for 18 min; 45 parts of hollow carbon nanofiber, 3.5 parts of silane coupling agent are continuously added, ultrasonically dispersed at 70 kHz for 60 min, and vacuum dried at 60°C for 2.5 h to obtain modified hollow carbon nanofiber;

[0052] S2, the modified hollow carbon nanofiber and stainless steel chopped fiber are mixed according to the mass ratio of 4:1 at 500 rpm for 9 min to obtain a modified reinforcing filler.

[0053] A C80 high-performance impermeable concrete, comprising the following steps:

[0054] S11, 40 parts of polycarboxylic acid mother liquor, 2 parts of defoaming agent, 5 parts of slump retaining agent, 0.5 parts of air entraining agent, and 150 parts of water are sequentially added to a container and stirred uniformly to obtain a composite polycarboxylic acid superplasticizer;

[0055] After the industrial waste residue material is removed of impurities, it is mixed according to the mass ratio of fly ash, slag, and phosphorous slag of 1:3:1.5, and then dried, crushed, ball milled for 60 min, and passed through a 2.36 mm sieve for standby use;

[0056] S21, 750 parts of coarse aggregate, 900 parts of fine aggregate, and 128 parts of water are mixed uniformly to obtain an aggregate mixture;

[0057] S31, in the aggregate mixture obtained in S21, 500 parts of ordinary Portland cement, 160 parts of industrial waste residue material, 40 parts of modified reinforcing filler, 9 parts of expanded microspheres and 10 parts of the composite polycarboxylate superplasticizer obtained in S11 are added while stirring, and stirred uniformly to obtain a gel mixture;

[0058] S41, in the gel mixture obtained in S31, 55 parts of water are added while stirring, and stirred uniformly to obtain C80 high-performance anti-permeability concrete.

[0059] Example 3: Preparation of C80 high-performance anti-permeability concrete

[0060] Preparation of modified reinforcing filler:

[0061] S1, 7 parts of silicon carbide, 0.004 parts of SDS and 95 parts of deionized water are uniformly mixed, stirred at 700 rpm at room temperature for 15 min; 50 parts of hollow carbon nanofiber, 4 parts of silane coupling agent are added and ultrasonically dispersed at 60 kHz for 50 min, and vacuum dried at 80°C for 1.5 h to obtain modified hollow carbon nanofiber;

[0062] S2, the modified hollow carbon nanofiber and the stainless steel chopped fiber are mixed at a mass ratio of 6:1 at 800 rpm for 8 min to obtain a modified reinforcing filler.

[0063] A C80 high-performance anti-permeability concrete, comprising the following steps:

[0064] S11, 35 parts of polycarboxylic acid mother liquor, 1 part of defoaming agent, 4 parts of slump retaining agent, 0.4 parts of air entraining agent and 140 parts of water are added into a container in sequence, and stirred uniformly to obtain a composite polycarboxylate superplasticizer;

[0065] After the industrial waste residue material is removed, it is uniformly mixed according to the mass ratio of fly ash, slag and phosphorus slag of 1:2:1, then dried, crushed, ball milled for 50 min, and sieved through a 2.36 mm sieve for standby;

[0066] S21, 740 parts of coarse aggregate, 850 parts of fine aggregate and 140 parts of water are mixed uniformly to obtain an aggregate mixture;

[0067] S31, in the aggregate mixture obtained in S21, 600 parts of ordinary Portland cement, 150 parts of industrial waste residue material, 30 parts of modified reinforcing filler, 8 parts of expanded microspheres and 8 parts of the composite polycarboxylate superplasticizer obtained in S11 are added while stirring, and stirred uniformly to obtain a gel mixture;

[0068] S41, in the gel mixture obtained in S31, 60 parts of water are added while stirring, and stirred uniformly to obtain C80 high-performance anti-permeability concrete.

[0069] Comparative Example 1:

[0070] On the basis of example 1, no modified reinforcing filler is added, and the others are the same as example 1.

[0071] Comparative example 2:

[0072] On the basis of example 1, no expanded microspheres are added, and the others are the same as example 1.

[0073] Comparative example 3:

[0074] Preparation of modified reinforcing filler:

[0075] S1, 0.002 parts of SDS is uniformly mixed with 100 parts of deionized water, stirred at room temperature at 600 rpm for 20 min; continue to add 40 parts of hollow carbon nanofiber, 4 parts of silane coupling agent, ultrasonic dispersion at 65 kHz for 55 min, vacuum drying at 70℃ for 2h, to obtain modified hollow carbon nanofiber.

[0076] S2, the modified hollow carbon nanofiber, stainless steel chopped fiber is mixed according to the mass ratio of 5:1 at 600 rpm for 10 min, to obtain the modified reinforcing filler.

[0077] Other steps are the same as example 1.

[0078] According to GB / T 50080-2016, GB / T 50081-2019, GB / T 50082-2009 and JGJ 55-2011, the performance of the concrete samples prepared in examples 1-3 and comparative examples 1-3 of the application is detected, and the results are shown in table 1.

[0079] Table 1 concrete performance table

[0080]

[0081] As can be seen from table 1, the C80 high performance anti-permeability concrete prepared by the method of the application has a machine outlet slump of 253-266mm, and a 2h slump of 249-261mm, which changes little compared with the machine outlet slump, indicating that the concrete has good fluidity and good retention capacity, the 28d compressive strength is 92.3-98.5MPa, the compressive performance is good, the porosity is 4.5%-5.0%, the compactness is high, and the impermeability grade is >P12, indicating that the prepared concrete has good impermeability performance.

[0082] The production cost of each ton of concrete in examples 1-3 is saved by 12.2%, 12.9% and 11.8% respectively compared with the process without using industrial waste residue materials.

[0083] Although the preferred embodiments of the present patent have been disclosed with some preferential implementations, the present patent is not limited to the above-mentioned embodiments, and other different forms of changes or variations can be made within the knowledge of those of ordinary skill in the art. It is not necessary or possible to exhaust all the embodiments here. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present patent should be included in the protection scope of the claims of the present patent.

Claims

1. A C80 high performance impermeable concrete, characterized in that, By weight parts, comprising the following components: Ordinary Portland cement: 360-700 parts; Industrial waste residue material: 120-180 parts; Fine aggregate: 800-960 parts; Coarse aggregate: 700-800 parts; Composite polycarboxylate superplasticizer: 4-14 parts; Modified reinforcing filler: 30-50 parts; Expanded microspheres: 8-10 parts; Water: 120-350 parts; The industrial waste residue material is a mixture of fly ash, slag and phosphorus slag, wherein the mass ratio of fly ash, slag and phosphorus slag is 1:(2-3):(1-1.5); The preparation method of the modified reinforcing filler comprises the following steps: S1, silicon carbide, SDS and deionized water are mixed in a mass ratio of 5-8:0.001-0.005:90-100, stirred at 500-800 rpm at room temperature for 15-20 min; continue to add hollow carbon nanofiber and silane coupling agent, ultrasonic dispersion, vacuum drying at 60-80℃ for 1.5-2.5h, to obtain modified hollow carbon nanofiber; wherein the mass ratio of silicon carbide, hollow carbon nanofiber and silane coupling agent is 1-3:5-10:0.4-0.6; S2, the modified hollow carbon nanofiber and stainless steel chopped fiber are mixed in a mass ratio of 4-6:1 at 500-800 rpm for 8-10 min to obtain a modified reinforcing filler; The expanded microspheres are a kind of thermoplastic hollow polymer microspheres, which are composed of a thermoplastic polymer shell and an enclosed liquid alkane gas.

2. The C80 high performance impermeable concrete according to claim 1, characterized in that, In S1, the ultrasonic frequency of ultrasonic dispersion is 60-70 kHz, and the ultrasonic time is 50-60 min.

3. The C80 high performance impermeable concrete according to claim 1, characterized in that, The composite polycarboxylate superplasticizer comprises the following components by weight parts: polycarboxylate mother liquor 35-45 parts, defoaming agent 1-3 parts, slump retaining agent 4-6 parts, air entraining agent 0.3-0.6 parts, and water 140-160 parts.

4. The C80 high performance impermeable concrete according to claim 1, characterized in that, The coarse aggregate is continuously graded gravel.

5. The C80 high performance impermeable concrete as claimed in claim 1, wherein, The average diameter of the expanded microspheres is 10-50µm.

6. A method of manufacturing a C80 high performance impermeable concrete according to any one of claims 1 to 5, characterized in that, Comprising the following steps: S11, polycarboxylate mother liquor 35-45 parts, defoaming agent 1-3 parts, slump retaining agent 4-6 parts, air entraining agent 0.3-0.6 parts, and water 140-160 parts are sequentially added to a container, stirred and mixed uniformly to obtain a composite polycarboxylate superplasticizer; After the industrial waste residue material is removed, it is mixed according to the formula, dried, crushed, ball milled for 50-60 min, and then passed through a 2.36mm sieve for standby; S21, mix 700-800 parts of coarse aggregate, 800-960 parts of fine aggregate and 70% of the total amount of water according to the formula to obtain an aggregate mixture; S31, in the aggregate mixture obtained in S21, 360-700 parts of ordinary Portland cement, 120-180 parts of industrial waste residue material, 30-50 parts of modified reinforcing filler, 8-10 parts of expanded microspheres and 4-14 parts of composite polycarboxylate superplasticizer obtained in S11 are added while stirring to obtain a gel mixture; S41, in the gel mixture obtained in S31, the remaining 30% of the total amount of water is added while stirring, and the mixture is stirred uniformly to obtain C80 high-performance impermeable concrete.

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