CN118026617B - High-strength low-heat large-volume concrete prepared by synergetic slow release of calcium silicate slag and porous solid waste aggregate and preparation method thereof - Google Patents
High-strength low-heat large-volume concrete prepared by synergetic slow release of calcium silicate slag and porous solid waste aggregate and preparation method thereof Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 175
- 239000004567 concrete Substances 0.000 title claims abstract description 99
- 239000000378 calcium silicate Substances 0.000 title claims abstract description 32
- 229910052918 calcium silicate Inorganic materials 0.000 title claims abstract description 32
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000002910 solid waste Substances 0.000 title claims abstract description 21
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- 239000000919 ceramic Substances 0.000 claims abstract description 41
- 239000002699 waste material Substances 0.000 claims abstract description 41
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- 239000010959 steel Substances 0.000 claims abstract description 39
- 239000004568 cement Substances 0.000 claims abstract description 25
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 23
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000012615 aggregate Substances 0.000 claims description 73
- UVGLBOPDEUYYCS-UHFFFAOYSA-N silicon zirconium Chemical compound [Si].[Zr] UVGLBOPDEUYYCS-UHFFFAOYSA-N 0.000 claims description 39
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 30
- 238000001035 drying Methods 0.000 claims description 28
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 19
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- 206010016807 Fluid retention Diseases 0.000 claims description 14
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- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 5
- 239000011575 calcium Substances 0.000 claims description 3
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Abstract
The invention belongs to the technical field of civil engineering solid waste building materials, and discloses high-strength low-heat large-volume concrete prepared by synergetic slow release of calcium silicate slag and porous solid waste aggregate and a preparation method thereof. The high-strength low-heat large-volume concrete is prepared from the following raw materials in parts by weight: 30-35 parts of calcium silicate slag, 20-25 parts of cement, 38-52 parts of aggregate and 19.2-31.2 parts of water; the aggregate comprises coarse aggregate and fine aggregate, wherein the coarse aggregate comprises the following components in parts by weight: 15-20 parts of waste ceramic and 15-20 parts of steel slag, wherein the fine aggregate comprises the following components in parts by mass: 8-12 parts of zirconium silica slag. According to the invention, the large-volume concrete is prepared by the cooperation and slow release of the calcium silicate slag and the porous aggregate, so that the hydration heat release amount and the hydration rate are obviously reduced, and the structural defect caused by uneven internal and external heat release of the large-volume concrete in the pouring process is effectively overcome.
Description
Technical Field
The invention relates to the technical field of civil engineering solid waste building materials, in particular to high-strength low-heat large-volume concrete prepared by synergetic slow release of calcium silicate slag and porous solid waste aggregate and a preparation method thereof.
Background
One of the main indexes of the internal and external temperature difference of the mass concrete is the adiabatic temperature rise, and the adiabatic temperature rise of the concrete has important research significance in the aspects of exploring the temperature stress and controlling the concrete temperature crack. At present, the total amount of hydration heat release in the process of pouring mass concrete is reduced mainly by changing the types of cement, so that the temperature difference between the inside and the outside of the mass concrete is reduced.
At present, most of the prior art reduces the heat release amount in the hydration process by changing the mixing amount of the traditional Portland cement and adding mineral powder, wherein CN115010439B adopts mineral admixture composed of tuff powder, calcined fly ash, calcined mineral powder and calcareous limestone powder as raw materials to partially replace cement, and combines with a temperature matching maintenance system to reduce the internal and external temperature difference in mass concrete. The patent CN117164274B is to change the kind of the water reducing agent, so that each component in the cement can obtain good dispersibility in the mass concrete easily. The method can obviously reduce the hydration reaction speed before the final setting of the concrete, and simultaneously reduce the heat release of the hydration heat of the cement. The patent CN113264727B is prepared by mixing cement, fly ash, mineral powder, fine aggregate and coarse aggregate, stirring uniformly to obtain a first mixture, weighing a water reducer and water according to a proportion, adding the weighed water reducer into water, mixing uniformly, and adding the water doped with the water reducer into the first mixture, stirring uniformly to obtain the mass concrete. However, the researches on large-volume low-heat concrete in the above patents are mostly focused on reducing the content of silicate cement and changing the kinds of admixture, but the addition of some water reducers has adverse effects on the overall strength.
In addition, some modifying materials are added into the concrete mixture, so that the temperature difference between the inside and the outside of the mass concrete is reduced. The patent CN114804731B is characterized in that a heat conducting material is added into the mixture, so that heat in the cement heat release process in the mass concrete can be quickly transferred to the outside of a test piece, and the difference between the internal temperature and the external temperature is reduced. The patent CN113493327B prepares large-volume concrete by changing the combination of additives and fillers and improving the preparation process, and the main principle is that polyvinyl butyral and polyethersulfone are added into the concrete after being heated to reduce the internal and external temperature difference in the concrete, and the addition of the water reducer plays a key role in reducing the internal and external temperature difference in the process. Patent CN112110701B is an acrylic-acrylamide resin prepared from acrylic acid, acrylamide, a crosslinking agent, an initiator, ammonia water and water. Mixing and stirring coarse aggregate, fine aggregate, acrylic acid-acrylamide resin, silicon nitride and fly ash, then sequentially adding cement and water and stirring to obtain concrete with lower hydration heat release rate. The patent CN114751691B is to add the phase change material into the concrete, so that the time of the exothermic peak of the mass concrete is delayed, and the temperature rise resistance and the crack resistance of the concrete are improved. The modified materials are various in types, but the preparation process is complex, and the problems of high manufacturing cost and adverse effect on the strength of concrete exist.
There is also some prior art that reduces shrinkage due to internal and external temperature differences by compensating for shrinkage, wherein patent CN115745462B compensates for shrinkage cracking caused by internal and external temperature differences in the casting process of bulk concrete by adding MgO. The expansion can compensate for partial contraction, but the tensile and compressive stress generated in the process can generate microcracks, so that the structure is not compact and the overall strength is adversely affected.
Therefore, there is a need in the art to develop a high strength low heat mass concrete to solve the problems of the prior art.
Disclosure of Invention
The invention aims to provide high-strength low-heat large-volume concrete prepared by the synergistic slow release of calcium silicate slag and porous solid waste aggregate and a preparation method thereof, and aims to solve the problems that in the prior art, in order to reduce the internal and external temperature difference of the large-volume concrete, the contents of silicate cement are generally reduced, the types of admixture are changed, additives are added and the like, but the strength of the concrete is reduced.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The invention provides high-strength low-heat large-volume concrete prepared by the synergistic slow release of calcium silicate slag and porous solid waste aggregate, which is prepared from the following raw materials in parts by weight: 30-35 parts of calcium silicate slag, 20-25 parts of cement, 38-52 parts of aggregate and 19.2-31.2 parts of water;
The aggregate comprises coarse aggregate and fine aggregate, wherein the coarse aggregate comprises the following components in parts by weight: 15-20 parts of waste ceramic and 15-20 parts of steel slag, wherein the fine aggregate comprises the following components in parts by mass: 8-12 parts of zirconium silica slag.
Preferably, in the calcium silicate slag, the content of Al 2O3 is more than or equal to 9.83wt%, the content of SiO 2 is more than or equal to 25.7wt%, the content of CaO is more than or equal to 52.4wt%, and the loss on ignition is more than or equal to 5.23wt%; the grain size of the silicon-calcium slag is more than or equal to 200 meshes.
Preferably, in the zirconium silica slag, the content of SiO 2 is more than or equal to 85.29wt%, the content of ZrO 2 is more than or equal to 10.04wt%, the content of Na 2 O is more than or equal to 0.21wt%, and the loss on ignition is more than or equal to 1.4wt%; the grain size of the zirconium silicon slag is 2-3 mu m.
Preferably, in the waste ceramic, the content of Al 2O3 is more than or equal to 20.57wt%, the content of SiO 2 is more than or equal to 67.82wt%, the content of CaO is more than or equal to 1.88wt%, the loss on ignition is more than or equal to 1.66wt%, and the water absorption is more than or equal to 8.27%; the particle size of the waste ceramic is 0.08-1 mm.
Preferably, in the steel slag, the content of Al 2O3 is more than or equal to 3.78wt%, the content of SiO 2 is more than or equal to 13.15wt%, the content of CaO is more than or equal to 44.97wt%, the loss on ignition is more than or equal to 0.98wt%, and the water absorption is more than or equal to 7.08%; the grain size of the steel slag is 5-10 mm.
The invention also provides a preparation method of the high-strength low-heat large-volume concrete prepared by the synergetic slow release of the calcium silicate slag and the porous solid waste aggregate, which comprises the following steps:
And mixing the calcium silicate slag, cement, aggregate and water to obtain the high-strength low-heat large-volume concrete.
Preferably, the mixing time is 2 to 5 minutes.
Preferably, the silicon-calcium slag is pretreated silicon-calcium slag;
The pretreatment of the silico-calcium slag comprises the following steps: sequentially performing first drying, ball milling, second drying and sieving on the silicon-calcium slag to obtain pretreated silicon-calcium slag;
The temperature of the first drying is 60-70 ℃, and the time of the first drying is 5-7 hours; ball milling is carried out for 40-50 min; the temperature of the second drying is 100-110 ℃, and the time of the second drying is 10-14 h.
Preferably, the aggregate is water-retaining aggregate;
the water retention treatment of the aggregate comprises the following steps: soaking the waste ceramic, steel slag and zirconium-silicon slag in water to obtain aggregate subjected to water retention treatment;
the soaking time is 22-26 h.
Preferably, the zirconium silicate slag is pretreated zirconium silicate slag;
The pretreatment of the zirconium silica slag comprises the following steps: mixing zirconium silicon slag and water, grinding for 2-4 times, and drying to obtain pretreated zirconium silicon slag;
The mass ratio of the zirconium silicon slag to the water is 2-4:1; after finishing each grinding, sequentially carrying out solid-liquid separation and water washing on the product obtained by grinding; the drying temperature is 60-70 ℃.
Compared with the prior art, the invention has the following beneficial effects:
1. The invention prepares high-strength low-heat large-volume concrete by using the silicon-calcium slag, cement, waste ceramic, steel slag, zirconium-silicon slag and water, wherein the solid waste accounts for more than 70%, thereby effectively solving the problem of environmental pollution caused by burying and stacking solid waste, realizing the effective utilization of resources, widening the utilization path of the solid waste resources and reducing the exploitation of natural resources in the manufacturing process of building materials;
2. The silicon-calcium slag mainly contains beta-C 2 S, has the characteristics of low hydration heat release rate and less hydration heat release quantity, and forms a cementing material of concrete with cement, so that the stress generated by internal and external temperature difference of the mass concrete in the pouring process can be greatly reduced, and the positive effect is achieved on keeping the overall good integrity and stress condition of the mass concrete;
3. The pretreated zirconium silicon slag has small particle size, wherein the main component is SiO 2, the zirconium silicon slag is fully mixed with waste ceramic and steel slag and subjected to water retention treatment, and the mixture of the zirconium silicon slag and water is filled in the pores of the waste ceramic and the steel slag, so that the zirconium silicon slag has a water slow release effect in the hydration process of large-volume concrete, and the phenomena of water loss and insufficient hydration caused by slow hydration of beta-C 2 S in the silicon calcium slag are effectively solved; particularly, zirconium silica slag particles in pores are smaller, a plurality of channels are formed, so that the slow release effect of water is effectively increased, the water is slowly released, and the water is hydrated with beta-C 2 S which is not fully reacted in the cementing material, so that the effect of full hydration is achieved; in addition, the high specific heat capacity of water also accelerates the speed of temperature emission; finally, in the hydration process, the beta-C 2 S hydration product and zirconium silicon slag form a new polymerization system, which is filled in the waste ceramics and steel slag to form a strength support, so that the adverse effect of the macroporous aggregate on the strength of the large-volume concrete is effectively reduced;
4. According to the invention, the large-volume concrete is prepared by the synergistic slow release of the silicon-calcium slag and the porous aggregate, the silicon-calcium slag is used as a cementing material, and the waste ceramic, the steel slag and the zirconium-silicon slag are subjected to water retention treatment, so that the hydration heat release amount and the hydration rate are obviously reduced, and the structural defect caused by uneven internal and external heat release of the large-volume concrete in the pouring process is effectively overcome.
Detailed Description
The invention provides high-strength low-heat large-volume concrete prepared by the synergistic slow release of calcium silicate slag and porous solid waste aggregate, which is prepared from the following raw materials in parts by weight: 30-35 parts of calcium silicate slag, 20-25 parts of cement, 38-52 parts of aggregate and 19.2-31.2 parts of water;
The aggregate comprises coarse aggregate and fine aggregate, wherein the coarse aggregate comprises the following components in parts by weight: 15-20 parts of waste ceramic and 15-20 parts of steel slag, wherein the fine aggregate comprises the following components in parts by mass: 8-12 parts of zirconium silica slag.
In the invention, the dosage of the calcium silicate slag is preferably 31-34 parts, more preferably 32-33 parts; the cement is preferably used in an amount of 21-24 parts, more preferably 22-23 parts; the amount of the aggregate is preferably 41-49 parts, more preferably 44-46 parts; the amount of water is preferably 24.96 to 27.84 parts, more preferably 25.92 to 26.88 parts.
In the coarse aggregate, the consumption of the waste ceramic is preferably 16-19 parts, more preferably 17-18 parts; the amount of steel slag is preferably 16 to 19 parts, more preferably 17 to 18 parts.
In the fine aggregate of the present invention, the amount of zirconium silica slag is preferably 9 to 11 parts, more preferably 10 parts.
In the present invention, the cement is ordinary portland cement.
In the calcium silicate slag, the content of Al 2O3 is more than or equal to 9.83wt%, the content of SiO 2 is more than or equal to 25.7wt%, the content of CaO is more than or equal to 52.4wt%, and the loss on ignition is more than or equal to 5.23wt%; the grain size of the calcium silicate slag is preferably more than or equal to 200 meshes, and more preferably more than or equal to 300 meshes.
In the zirconium silicon slag, the content of SiO 2 is more than or equal to 85.29wt%, the content of ZrO 2 is more than or equal to 10.04wt%, the content of Na 2 O is more than or equal to 0.21wt%, and the loss on ignition is more than or equal to 1.4wt%; the grain size of the zirconium silicate slag is preferably 2 to 3 μm, more preferably 2.2 to 2.8 μm.
In the waste ceramic, the content of Al 2O3 is more than or equal to 20.57wt%, the content of SiO 2 is more than or equal to 67.82wt%, the content of CaO is more than or equal to 1.88wt%, the loss on ignition is more than or equal to 1.66wt%, and the water absorption is more than or equal to 8.27%; the particle size of the waste ceramic is preferably 0.08 to 1mm, more preferably 0.5 to 0.8mm.
In the steel slag, the content of Al 2O3 is more than or equal to 3.78wt%, the content of SiO 2 is more than or equal to 13.15wt%, the content of CaO is more than or equal to 44.97wt%, the loss on ignition is more than or equal to 0.98wt%, and the water absorption is more than or equal to 7.08%; the grain size of the steel slag is preferably 5-10 mm, and more preferably 6-8 mm.
The invention also provides a preparation method of the high-strength low-heat large-volume concrete prepared by the synergetic slow release of the calcium silicate slag and the porous solid waste aggregate, which comprises the following steps:
And mixing the calcium silicate slag, cement, aggregate and water to obtain the high-strength low-heat large-volume concrete.
In the construction process of the mass concrete structure, as the main cementing material cement generates a large amount of hydration heat in the hydration process, the mass concrete has larger general size and poorer heat conduction property, so that the internal heat is difficult to quickly transfer in the pouring process, the temperature of the center of the mass concrete is higher, the edge is lower, and the internal surface temperature difference of the mass concrete is larger. When the stress generated by the temperature difference between the inside and the outside is too large, the mass concrete is easy to crack, and the stress of the whole structure is adversely affected. The invention can effectively reduce hydration heat release by reducing the cement consumption and increasing the low-activity materials, and can effectively ensure heat dissipation and full hydration by matching with the slow release effect of the porous aggregate.
In the present invention, the mixing time is preferably 2 to 5 minutes, more preferably 3 to 4 minutes.
In the invention, the silicon-calcium slag is pretreated silicon-calcium slag;
The pretreatment of the silico-calcium slag comprises the following steps: sequentially performing first drying, ball milling, second drying and sieving on the silicon-calcium slag to obtain pretreated silicon-calcium slag;
The temperature of the first drying is preferably 60-70 ℃, and more preferably 62-65 ℃; the first drying time is preferably 5-7 hours, more preferably 6-6.5 hours; ball milling is carried out in a ball mill, and the ball-to-material ratio is preferably 14-16: 1, further preferably 15:1, a step of; the ball milling time is preferably 40-50 min, more preferably 45-48 min; the second drying temperature is preferably 100-110 ℃, and more preferably 105-107 ℃; the second drying time is preferably 10-14 h, and more preferably 11-12 h; the mesh size of the screen used for sieving is preferably not less than 200 meshes, more preferably not less than 300 meshes.
In the invention, the silicon-calcium slag contains a large amount of beta-C 2 S, has the characteristics of low hydration heat release and slow hydration rate in the hydration process, and is added with cement in the preparation process of mass concrete to prepare the low-heat gelling material, thereby reducing the hydration heat release quantity and the hydration heat release rate of the mass concrete in the hydration process.
In the invention, the aggregate is water-retention treated aggregate;
the water retention treatment of the aggregate comprises the following steps: soaking the waste ceramic, steel slag and zirconium-silicon slag in water to obtain aggregate subjected to water retention treatment;
the water is used in an amount such that the waste ceramic, steel slag and zirconium silicon slag are immersed in the water; the soaking time is preferably 22 to 26 hours, more preferably 23 to 24 hours.
In the invention, the large-pore waste ceramic and steel slag are adopted as aggregate of the large-volume concrete, and part of water is stored in the pores of the porous aggregate in the process of preparing the large-volume concrete by utilizing the porous characteristic of the large-pore waste ceramic and steel slag, so that the large-pore waste ceramic and steel slag are beneficial to the diffusion of the internal temperature to the outside and the reduction of the internal-external temperature difference by utilizing the characteristic of the large specific heat capacity of water. In addition, after the water in the pores is consumed, the communication holes in the aggregate are also favorable for internal and external temperature transmission, so that the mass concrete can perform better heat dissipation.
In the invention, the zirconium silicate slag is pretreated zirconium silicate slag;
The pretreatment of the zirconium silica slag comprises the following steps: mixing zirconium silicon slag and water, grinding for 2-4 times, and drying to obtain pretreated zirconium silicon slag;
The mass ratio of the zirconium silicon slag to the water is preferably 2-4:1, and more preferably 3-3.5:1; after finishing each grinding, sequentially carrying out solid-liquid separation and water washing on the product obtained by grinding; grinding is carried out in a ball mill, and the ball-to-material ratio is preferably 14-16: 1, further preferably 15:1, a step of; the water washing is to wash the solid product obtained by solid-liquid separation; the time of single grinding is preferably 10-20 min, more preferably 15-17 min; the time of the single water washing is preferably 10-20 min, more preferably 15-17 min; the drying temperature is preferably 60-70 ℃, and more preferably 65-68 ℃; ball milling is carried out on the obtained product after drying, the ball milling is carried out in a ball mill, and the ball-to-material ratio is preferably 14-16: 1, further preferably 15:1, the ball milling time is preferably 40-50 min, more preferably 45-48 min.
In the invention, zirconium silica slag is light yellow green, is a colloidal polymer with higher water content, and mainly comprises silicic acid slag (mSiO 2·nH2 O). At temperatures above 650 ℃, moisture can be removed, yielding amorphous SiO 2 powder. The solids content was about 20% and the SiO 2 content was about 16%. Through the pretreatment, amorphous SiO 2 with the grade of the crystalline silicon of 94.3 percent, the specific surface area of 494.3m 2/g and the granularity distribution of 2-3 mu m can be obtained. The zirconium silicon slag treated by water retention has the characteristic of high SiO 2 content, and can obviously improve the strength of the mass concrete when being used as the concrete fine aggregate.
In the preparation of bulk concrete, the pores of the waste ceramic and steel slag are filled with a mixture of zirconium silicon slag and water. Because the silicon-calcium slag contains a large amount of beta-C 2 S which reacts with water slowly, when the reaction proceeds, part of beta-C 2 S does not fully react with water, and part of water is lost. At this time, the mixture of zirconium silica slag and water in the waste ceramic and steel slag has a continuous hydration effect, and the moisture in the mixture can be transferred from the pores to the mass concrete aggregate to be further hydrated with unreacted and complete beta-C 2 S. Namely, the mixture of zirconium silicon slag and water in the waste ceramic and steel slag plays a role in slow release, so that the prepared mass concrete can keep low thermal effect and can also keep sufficient hydration to ensure strength. Meanwhile, partial hydration products enter waste ceramics and steel slag to be combined with zirconium silicon slag in the waste ceramics and steel slag to form a staggered anchor rod effect, so that the influence of the addition of porous aggregate into concrete on the reduction of the overall strength of the concrete is overcome. The mixed use of the steel slag with higher strength and the waste ceramic further compensates the influence of the addition of the porous aggregate into the concrete on the reduction of the overall strength of the concrete, and further improves the strength of the mass concrete.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
The parameters of the raw materials used in the following examples and comparative examples are as follows:
And (3) cement: ordinary portland cement;
The content of Al 2O3 in the calcium silicate slag is 9.83wt%, the content of SiO 2 is 25.7wt%, the content of CaO is 52.4wt%, and the loss on ignition is 5.23wt%;
In the waste ceramic, the content of Al 2O3 is 20.57wt%, the content of SiO 2 is 67.82wt%, the content of CaO is 1.88wt%, the loss on ignition is 1.66wt%, and the water absorption is 8.27%; the particle size of the waste ceramic is 0.8mm;
the content of Al 2O3 in the steel slag is 3.78wt%, the content of SiO 2 is 13.15wt%, the content of CaO is 44.97wt%, the loss on ignition is 0.98wt%, and the water absorption is 7.08%; the grain diameter of the steel slag is 10mm;
The content of SiO 2 in the zirconium silica slag is 85.29wt%, the content of ZrO 2 is 10.04wt%, the content of Na 2 O is 0.21wt%, and the loss on ignition is 1.4wt%.
Example 1
Preparing high-strength low-heat large-volume concrete:
(1) Pretreatment of silicon-calcium slag: placing 30 parts of calcium silicate slag in an oven to be dried for 6 hours at 65 ℃; the dried silicon-calcium slag is subjected to preliminary crushing by a small hammer, and then is placed in a ball mill (ball-material ratio is controlled to be 15:1) for ball milling for 45min; placing the silicon-calcium slag after ball milling into an oven to be dried for 12 hours at 105 ℃; sieving the dried silicon-calcium slag with a 200-mesh square hole sieve, and taking the undersize to obtain pretreated silicon-calcium slag for later use;
(2) Pretreatment of zirconium silicon slag: mixing 10 parts of zirconium silica slag and water (the mass ratio of the zirconium silica slag to the water is 3:1), grinding for 4 times (grinding is carried out in a ball mill, the ball material ratio is controlled to be 15:1), and sequentially carrying out solid-liquid separation and washing of solid products on the ground products after each grinding, wherein the time of each grinding is controlled to be 15min, and the time of each washing is controlled to be 15min; drying at 65 ℃, and then placing in a ball mill (controlling the ball-material ratio to be 15:1) for 45min to obtain pretreated zirconium silica slag with the particle size of 2 mu m;
(3) Water retention treatment of waste ceramics, steel slag and pretreated zirconium-silicon slag: placing 15 parts of waste ceramic, 20 parts of steel slag and pretreated zirconium silicon slag in a stirring pot, adding water until the water level is higher than that of the waste ceramic, the steel slag and the pretreated zirconium silicon slag, stirring at 600r/min for 15min to obtain an aggregate mixture, and soaking for 24h to obtain water-retaining treated aggregate for later use;
(4) And placing the pretreated silicon-calcium slag, the aggregate subjected to water retention treatment, 25 parts of ordinary Portland cement and 26.4 parts of water into a mixer to mix for 2min, so as to obtain the high-strength low-heat large-volume concrete.
Example 2
The differences from example 1 are: the usage amount of the silicon-calcium slag is 35 parts, the usage amount of the silicate cement is 20 parts, the usage amount of the waste ceramic is 20 parts, the usage amount of the steel slag is 15 parts, and the usage amount of the zirconium-silicon slag is 10 parts. Otherwise, the same as in example 1 was conducted.
Example 3
The differences from example 1 are: the consumption of the waste ceramic is 20 parts, and the consumption of the steel slag is 15 parts. Otherwise, the same as in example 1 was conducted.
Comparative example 1
The differences from example 1 are: the usage amount of the silicon-calcium slag is 25 parts, and the usage amount of the silicate cement is 30 parts. Otherwise, the same as in example 1 was conducted.
Comparative example 2
The differences from example 1 are: the addition of the calcium silicate slag is omitted, and the using amount of the silicate cement is 55 parts. Otherwise, the same as in example 1 was conducted.
Comparative example 3
The differences from example 2 are: the addition of zirconium silica slag is omitted. Otherwise, the same as in example 2 was conducted.
The mass concrete obtained in examples 1 to 3 and comparative examples 1 to 3 was tested for adiabatic temperature rise and mechanical properties, and the test method and results were as follows:
(1) Testing of adiabatic temperature rise:
in the process of preparing the mass concrete heat-insulating temperature-rising test piece, a flat-mouth forced concrete mixer is used for testing according to the test method standard of physical and mechanical properties of concrete (GB/T50081-2019).
Preparation of the sample: the mass concrete obtained in examples 1 to 3 and comparative examples 1 to 3 were prepared as follows;
The preparation method comprises the following steps: coating butter on the inner wall of the heat-insulating temperature rise barrel, sleeving a 3-layer plastic bag, stirring mass concrete, pouring the mass concrete into the plastic bag, pouring the mass of a test piece to be 45L, and uniformly vibrating the test piece from the edge to the center by using a concrete vibrating rod until the mass is flooded; a heat conducting copper pipe is inserted into the center of the test piece, heat conducting oil is poured into the test piece, the barrel cover is covered, the barrel cover is bonded by glass cement, a large-volume concrete heat insulation temperature rise test piece is finally prepared, and initial temperatures and temperatures at age 1d, 3d, 7d, 14d, 21d and 28d are measured, as shown in table 1.
Table 1 examples 1 to 3 and comparative examples 1 to 3 give mass concrete with different age temperature rise values
Adiabatic temperature rise value，
Wherein,Concrete insulation Wen Shengzhi (DEG C),/>, for the n-day ageDevice adiabatic temperature rise correction coefficient,/>The equipment records the temperature (DEG C) of the concrete in the n-day age-The apparatus records the initial temperature (c) of the concrete mix;
thermal insulation temperature rise correction coefficient of equipment Wherein/>Concrete heat capacity (J/. Degree.C.),/>-Heat capacity (J/°c) of part of the test fitting;
the specific heat capacity of the concrete is 0.97 kJ/(kg. DEG C.), the weight of the heat-insulating temperature-rising barrel is 19.9kg, the weight of the base is 12.65kg, the weight of the barrel cover is 6.4kg, and the weight of the external square barrel is 33.95kg.
TABLE 2 adiabatic temperature rise values for bulk concrete obtained in examples 1 to 3 and comparative examples 1 to 3
As can be seen from examples 1 and comparative examples 1-2, the temperature rise values of the large-volume concrete of the Si-Ca slag all show continuous rising trend within 7d, the adiabatic temperature rise curve gradually becomes gentle after 7d, the later period is basically close to a smooth straight line, the trend of the temperature rise values is kept consistent, the later period heat release is stable, the temperature rise value of example 1 is lower than that of comparative examples 1 and 2, and this shows that the increase of the Si-Ca slag can effectively reduce the hydration heat release rate and the heat release quantity.
From examples 1 and 3, it is apparent that the waste ceramic has a larger proportion and a slower hydration reaction and a lower hydration heat release amount when the total amount of aggregate is constant, and the waste ceramic can effectively reduce the adiabatic temperature rise of concrete.
As is evident from example 2 and comparative example 3, the hydration exotherm of the zirconium-free silica slag is concentrated and of shorter duration. Along with the increase of the zirconium silica slag, the peak value of the temperature rise rate is effectively reduced, the occurrence time of the peak value of the temperature rise rate is delayed, the hydration process of the cementing material is obviously changed, the concentrated heat release caused by the hydration of the cement minerals is relieved, the heat release duration is longer, and the rising section of the adiabatic temperature rise is prolonged.
(2) Testing mechanical properties:
The mass concrete obtained in examples 1 to 3 and comparative examples 1 to 3 was poured into a mold to prepare a concrete standard compression test piece of 150mm×150mm, allowed to stand at room temperature for two days and nights, removed from the mold, cured for 28 days at a temperature of 23 ℃ and a humidity of 95%, and the compression strength of each concrete standard compression test piece was measured using a uniaxial press.
The compressive strengths of the concrete standard compressive test pieces described in example 1, example 2, example 3, comparative example 1, comparative example 2 and comparative example 3 were examined to be 58.2MPa, 52.8MPa, 53.5MPa, 47.2MPa, 52.9MPa and 48.9MPa, respectively, at 28 d.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (7)
1. The high-strength low-heat large-volume concrete prepared by the synergistic slow release of the silicon-calcium slag and the porous solid waste aggregate is characterized by being prepared from the following raw materials in parts by weight: 30-35 parts of calcium silicate slag, 20-25 parts of cement, 38-52 parts of aggregate and 19.2-31.2 parts of water;
The aggregate comprises coarse aggregate and fine aggregate, wherein the coarse aggregate comprises the following components in parts by weight: 15-20 parts of waste ceramic and 15-20 parts of steel slag, wherein the fine aggregate comprises the following components in parts by mass: 8-12 parts of zirconium silicon slag;
the aggregate is water-retaining aggregate;
the water retention treatment of the aggregate comprises the following steps: soaking the waste ceramic, steel slag and zirconium-silicon slag in water to obtain aggregate subjected to water retention treatment;
The soaking time is 22-26 hours; before soaking, stirring a mixture obtained by mixing waste ceramic, steel slag, zirconium silicon slag and water, wherein the stirring speed is 600r/min, and the stirring time is 15min;
The zirconium silica slag is pretreated zirconium silica slag;
the pretreatment of the zirconium silica slag comprises the following steps: mixing zirconium silicon slag and water, grinding for 2-4 times, and drying to obtain pretreated zirconium silicon slag;
the mass ratio of the zirconium silicon slag to the water is 2-4:1; after finishing each grinding, sequentially carrying out solid-liquid separation and water washing on the product obtained by grinding; the drying temperature is 60-70 ℃.
2. The high-strength low-heat large-volume concrete prepared by the synergistic slow release of the calcium silicate slag and the porous solid waste aggregate according to claim 1, wherein the content of Al 2O3 in the calcium silicate slag is more than or equal to 9.83wt%, the content of SiO 2 is more than or equal to 25.7wt%, the content of CaO is more than or equal to 52.4wt%, and the loss on ignition is more than or equal to 5.23wt%; the grain size of the silicon-calcium slag is more than or equal to 200 meshes.
3. The high-strength low-heat large-volume concrete prepared by the synergistic slow release of the calcium silicate slag and the porous solid waste aggregate according to claim 1 or 2, wherein the content of SiO 2 in the zirconium silicate slag is more than or equal to 85.29wt%, the content of ZrO 2 is more than or equal to 10.04wt%, the content of Na 2 O is more than or equal to 0.21wt%, and the loss on ignition is more than or equal to 1.4wt%; the grain size of the zirconium silicon slag is 2-3 mu m.
4. The high-strength low-heat large-volume concrete prepared by the synergistic slow release of the calcium silicate slag and the porous solid waste aggregate according to claim 3, wherein the content of Al 2O3 in the waste ceramic is more than or equal to 20.57wt%, the content of SiO 2 is more than or equal to 67.82wt%, the content of CaO is more than or equal to 1.88wt%, the loss on ignition is more than or equal to 1.66wt%, and the water absorption is more than or equal to 8.27%; the particle size of the waste ceramic is 0.08-1 mm.
5. The high-strength low-heat large-volume concrete prepared by the synergistic slow release of the calcium silicate slag and the porous solid waste aggregate according to claim 1, 2 or 4, wherein the content of Al 2O3 in the steel slag is more than or equal to 3.78wt%, the content of SiO 2 is more than or equal to 13.15wt%, the content of CaO is more than or equal to 44.97wt%, the loss on ignition is more than or equal to 0.98wt%, and the water absorption is more than or equal to 7.08%; the grain diameter of the steel slag is 5-10 mm.
6. The method for preparing the high-strength low-heat large-volume concrete by synergic slow-release preparation of the calcium silicate slag and the porous solid waste aggregate according to any one of claims 1 to 5, which is characterized by comprising the following steps:
Mixing the calcium silicate slag, cement, aggregate and water to obtain high-strength low-heat large-volume concrete;
The silicon-calcium slag is pretreated silicon-calcium slag;
The pretreatment of the silico-calcium slag comprises the following steps: sequentially performing first drying, ball milling, second drying and sieving on the silicon-calcium slag to obtain pretreated silicon-calcium slag;
The temperature of the first drying is 60-70 ℃, and the time of the first drying is 5-7 h; ball milling time is 40-50 min; the second drying temperature is 100-110 ℃, and the second drying time is 10-14 h;
the aggregate is water-retaining aggregate;
the water retention treatment of the aggregate comprises the following steps: soaking the waste ceramic, steel slag and zirconium-silicon slag in water to obtain aggregate subjected to water retention treatment;
The soaking time is 22-26 hours; before soaking, stirring a mixture obtained by mixing waste ceramic, steel slag, zirconium silicon slag and water, wherein the stirring speed is 600r/min, and the stirring time is 15min;
The zirconium silica slag is pretreated zirconium silica slag;
the pretreatment of the zirconium silica slag comprises the following steps: mixing zirconium silicon slag and water, grinding for 2-4 times, and drying to obtain pretreated zirconium silicon slag;
the mass ratio of the zirconium silicon slag to the water is 2-4:1; after finishing each grinding, sequentially carrying out solid-liquid separation and water washing on the product obtained by grinding; the drying temperature is 60-70 ℃.
7. The method for preparing high-strength low-heat large-volume concrete by synergic slow-release preparation of calcium silicate slag and porous solid waste aggregate according to claim 6, wherein the mixing time of the calcium silicate slag, cement, aggregate and water is 2-5 min.
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