CN115974487A - Ultrahigh-performance concrete and preparation method thereof - Google Patents
Ultrahigh-performance concrete and preparation method thereof Download PDFInfo
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 134
- 239000003112 inhibitor Substances 0.000 claims abstract description 39
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000004568 cement Substances 0.000 claims abstract description 25
- 239000004567 concrete Substances 0.000 claims abstract description 22
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 239000006004 Quartz sand Substances 0.000 claims abstract description 16
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 16
- 239000004576 sand Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 10
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 19
- 230000005415 magnetization Effects 0.000 claims description 19
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 13
- 239000001103 potassium chloride Substances 0.000 claims description 9
- 235000011164 potassium chloride Nutrition 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 2
- 229920002125 Sokalan® Polymers 0.000 claims description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 2
- 235000013877 carbamide Nutrition 0.000 claims description 2
- 239000004202 carbamide Substances 0.000 claims description 2
- 229920002401 polyacrylamide Polymers 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 16
- 239000002245 particle Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 239000000084 colloidal system Substances 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000011083 cement mortar Substances 0.000 description 18
- 238000012360 testing method Methods 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 13
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 235000002639 sodium chloride Nutrition 0.000 description 4
- 235000019270 ammonium chloride Nutrition 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 235000007715 potassium iodide Nutrition 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- -1 K + Chemical class 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an ultra-high performance concrete and a preparation method thereof, wherein the ultra-high performance concrete comprises the following components in parts by weight: the concrete components comprise cement, silica fume, quartz sand, machine-made sand, steel fiber, a water reducing agent and magnetized water, wherein a hydrate inhibitor is added into the magnetized water; the preparation method comprises adding hydrate inhibitor into magnetized water; mixing and stirring cement and silica fume, adding the treated magnetized water and the water reducing agent, and uniformly stirring; and adding quartz sand and machine-made sand steel fibers, uniformly stirring, and filling into a mold for molding. According to the invention, by combining the magnetized water and the hydrate inhibitor, the viscosity of water molecules is reduced, the activity of the water molecules is improved, and the activity maintaining time of the magnetized water is prolonged, so that the water molecules can rapidly enter the inside of cement particles in the mixing process, the viscosity of cement colloid is reduced, the work performance of UHPC is improved, the difficulty in preparation, transportation and construction of UHPC is reduced, the production cost is reduced, and the strength and durability of UHPC are improved.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to ultra-high performance concrete and a preparation method thereof.
Background
Ultra-high performance concrete (UHPC) is a novel cement-based building material, and is gradually used for complex engineering of ultra-high-rise and large-span structures due to the characteristics of excellent mechanical property, durability and long service time. Compared with the traditional concrete, the UHPC uses a large amount of cementing materials, has the characteristic of low water-cement ratio, so that the UHPC is difficult to prepare and difficult to transport and construct due to high blending viscosity in the preparation process, and air cannot be discharged, thereby affecting the performance of the concrete. At present, some scholars can improve the fluidity of concrete and reduce the viscosity of concrete by magnetizing water and applying the magnetized water to the concrete, thereby improving the strength and durability of the concrete. The principle is that 4 hydrogen bonds can be formed by one water molecule, association molecular groups are formed among the water molecules through the hydrogen bonds, and the association molecular groups can be disassembled by magnetization to form a single water molecule, so that the activity of the water molecule is improved, and the surface tension of the water molecule is reduced. Therefore, the magnetized water can rapidly enter the inside of cement particles, reduce cement agglomeration to a certain extent, and increase the hydration degree of cement, thereby improving the fluidity of concrete mixtures and achieving the purpose of improving the strength and durability of concrete.
Application number CN201610498424.4 discloses that the magnetized mine water prepared by magnetizing the mine water in a magnetic field is stirred with other cementing materials and sandstone materials to prepare the gob-side entry retaining concrete, so that the early strength and pumpability of the concrete are improved, and the later strength of the concrete is increased. CN 112266196A discloses that the compression strength, the fluidity and the durability of the concrete are improved after the reclaimed water of a concrete mixing plant is magnetized to replace the common water and mixed with raw materials required by fair-faced concrete to obtain the fair-faced concrete, so that the reclaimed water is recycled and the magnetized reclaimed water is used for replacing the clear water. CN112341066A discloses a sleeve grouting material and a preparation method thereof, wherein water is magnetized to effectively reduce the surface tension of water molecules, enhance the bonding strength of binding material particles, improve the fracture resistance of the binding material particles, solve the problem of poor rheological property caused by fibers, and meet the performance requirements of fluidity, micro-expansion and the like on the premise of meeting high ductility.
Although the strength and performance of the concrete are improved to some extent by using the magnetized water in the above publication, the magnetized water has the following problems in use: the magnetized water obtained by magnetization treatment can gradually recover to be in an unmagnetized state within a few minutes, which puts higher requirements on the preparation time of UHPC, the time is a little longer, and the magnetized water loses the function of being magnetized water when recovering to be in an unmagnetized state in the process of preparing UHPC; thereby failing to achieve the expected effects of reducing viscosity and improving concrete performance.
Disclosure of Invention
In order to solve the technical problems, the invention provides the ultra-high performance concrete, which improves the activity of magnetized water and prolongs the magnetized activity time, thereby improving the workability of the ultra-high performance concrete mixture and enhancing the strength and the durability of the concrete.
The invention is realized by the following technical scheme:
the ultra-high performance concrete comprises the following components in parts by weight: 600-1350 parts of cement, 70-150 parts of silica fume, 200-450 parts of quartz sand, 800-1800 parts of machine-made sand, 15-75 parts of steel fiber, 15-35 parts of water reducing agent and 120-270 parts of magnetized water, wherein hydrate inhibitor is added into the magnetized water in an amount of 0.5-10 parts.
Furthermore, the magnetized water is obtained by adopting an adjustable magnetization device for magnetization, the magnetization intensity is 260-800mT, and the water flow speed is 0.5-20m/s.
Further, the hydrate inhibitor comprises one or more of triethanolamine, carbamide, polyacrylamide, acrylamide, ammonium nitrate, potassium chloride, potassium iodide, sodium chloride, ammonium chloride, polyacrylic acid polymer, preferably one or more of ammonium nitrate, potassium chloride, potassium iodide, sodium chloride, ammonium chloride in combination.
The cement is PO42.5 grade ordinary portland cement.
SiO in the silica fume 2 The content is more than or equal to 95 percent, and the specific surface area is not less than 25000m 2 /kg。
SiO in the quartz sand 2 The content is more than or equal to 97 percent, and the content is 20-40 meshes, 40-70 meshes and 70-140 meshes of continuous gradation, and the part ratio is 2-6.
The steel fiber is copper-plated micro-wire steel fiber, the length-diameter ratio is 60-70, and the tensile strength is larger than or equal to 25000MPa.
The water reducing agent is a polycarboxylic acid water reducing agent, and the solid content is 40%.
The application further provides a preparation method of the ultra-high performance concrete, which comprises the steps of carrying out magnetization treatment on water by using an adjustable magnetization device to obtain magnetized water, and adding a hydrate inhibitor into the magnetized water in a metering mode; and mixing and stirring the magnetized water and other components in the concrete formula to prepare the ultra-high performance concrete.
Further, the method comprises the following steps:
(1) Magnetizing tap water by using an adjustable magnetizing device, wherein the magnetization intensity of the magnetizing device is 260-800mT, the water flow speed is 0.5-20m/s, and a hydrate inhibitor is metered into the magnetizing device after the magnetizing treatment;
(2) Weighing cement and silica fume according to a formula, mixing and stirring for 30s, adding the weighed water reducer and the prepared magnetized water, and uniformly stirring to obtain slurry;
(3) And (3) sequentially adding the quartz sand and the natural sand weighed according to the formula into the slurry obtained in the step (2), uniformly stirring, adding the weighed steel fibers, uniformly stirring, filling into a mold, and curing to obtain the ultra-high performance concrete.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. on one hand, the invention changes the bond length and bond angle of water molecules through magnetization, and polarizes the water molecules directionally, so as to cause the hydrogen bonds among the water molecules to break, improve the water activity and reduce the surface tension; meanwhile, a hydrate inhibitor is added into the magnetized water, ionized monovalent ions are combined with water molecules (water molecules with broken hydrogen bonds or water molecules with still existing intermolecular hydrogen bonds) to generate negative hydrated ions, the negative hydrated ions and magnetic ring water have synergistic effect, the water activity is further improved, the water viscosity is reduced, the water molecule potential energy is increased, water molecules rapidly enter the inside of cement particles in the UHPC blending process, the cement colloid viscosity is reduced, the work performance, the strength and the durability of the UHPC are improved, and the function of the viscosity reduction type water reducer is realized to a certain extent;
2. on the other hand, the negative hydrated ions formed by adding the hydrate inhibitor can prolong the magnetized state of the magnetized water, keep the activity time of water molecules, and avoid the problems that the magnetized water is recovered to the unmagnetized state in the use process and can not achieve the viscosity reduction of pre-fetching and the performance improvement of concrete.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention. It should be noted that the present invention is in practical development and use. Interpretation of terms:
in this application, the hydrate inhibitor is added to water which contains a large amount of monovalent ions, such as K + ，CL - ，I - Etc., then the water molecules in their vicinity exhibit greater activity than pure water due to the breakdown of the hydrated ion structure thereby reducing the viscosity of the water and increasing the potential energy of the water molecules. Common hydrate inhibitors such as KCL, naCl, NH 4 CL、KNO 3 、NH 4 NO 3 And KI and the like.
Example 1
An ultra-high performance concrete comprising the following components by weight: 180 parts of magnetized water, 900 parts of cement, 100 parts of silica fume, 300 parts of quartz sand, 1200 parts of machine-made sand, 50 parts of steel fiber and 25 parts of water reducing agent; the magnetized water is added with 0.5 part of hydrate inhibitor, and the hydrate inhibitor is ammonium nitrate.
Example 2
An ultra-high performance concrete comprising the following components by weight: 180 parts of magnetized water, 900 parts of cement, 100 parts of silica fume, 300 parts of quartz sand, 1200 parts of machine-made sand, 50 parts of steel fiber and 25 parts of water reducing agent; the magnetized water is added with hydrate inhibitor potassium chloride, and the adding amount is 2 parts.
Example 3:
an ultra-high performance concrete comprising the following components by weight: 180 parts of magnetized water, 900 parts of cement, 100 parts of silica fume, 300 parts of quartz sand, 1200 parts of machine-made sand, 50 parts of steel fiber and 25 parts of water reducing agent; the magnetized water is added with 6 portions of hydrate inhibitor ammonium chloride.
Example 4
An ultra-high performance concrete comprising the following components by weight: 180 parts of magnetized water, 900 parts of cement, 100 parts of silica fume, 300 parts of quartz sand, 1200 parts of machine-made sand, 50 parts of steel fiber and 25 parts of water reducing agent; adding hydrate inhibitors KCl and NH into magnetized water 4 Cl in 4 portions, wherein KCl is 2 portions and NH 4 Cl is 2 parts.
Example 5
An ultra-high performance concrete comprising the following components by weight: 120 parts of magnetized water, 600 parts of cement, 70 parts of silica fume, 200 parts of quartz sand, 800 parts of machine-made sand, 30 parts of steel fiber and 15 parts of water reducing agent; adding hydrate inhibitors KCl and NH into magnetized water 4 NO 3 And KI in 6 weight portions, KCl in 2 weight portions and NH 4 NO 3 2 parts of KI and 2 parts of KI.
Example 6
An ultra-high performance concrete comprising the following components: 270 parts of magnetized water, 1350 parts of cement, 150 parts of silica fume, 450 parts of quartz sand, 1800 parts of machine-made sand, 75 parts of steel fiber and 35 parts of water reducing agent; adding hydrate inhibitors NaCl and KNO into the magnetized water 3 、NH 4 NO 3 The addition amount is 10 parts, wherein the NaCl is 4 parts, and the KNO is 3 Is 3 portions of NH 4 NO 3 Is 3 portions.
In the above examples 1 to 6, the magnetized water was magnetized by using an adjustable magnetization device, the magnetization was 350mT, and the water flow rate was 2.5m/s.
The cement is PO42.5 grade ordinary portland cement. SiO in the silica fume 2 The content is 95%, and the specific surface area is 25068m 2 In terms of/kg. SiO in the quartz sand 2 The content is 98%, and the content is 20-40 meshes, 40-70 meshes and 70-140 meshes of continuous gradation, and the part ratio is 3. The steel fiber is copper-plated micro-wire steel fiber, the length-diameter ratio is 60, and the tensile strength is 25000MPa. The water reducing agent is polycarboxylic acidA water reducing agent.
Examples 1 to 6The ultra-high performance concrete is prepared by the following method:
(1) Magnetizing tap water by using an adjustable magnetizing device, wherein the magnetization intensity of the magnetizing device is 350mT, the water flow speed is 2.5m/s, and a hydrate inhibitor is metered and added into the magnetizing device after the magnetizing device is magnetized;
(2) Weighing cement and silica fume according to a formula, mixing and stirring for 30s, adding the weighed water reducer and the prepared magnetized water, and uniformly stirring to obtain slurry;
(3) And (3) sequentially adding the quartz sand and the natural sand weighed according to the formula into the slurry obtained in the step (2), uniformly stirring, adding the weighed steel fibers, uniformly stirring, filling into a mold, and curing to obtain the ultra-high performance concrete.
Fluidity tests were carried out on the mortar of examples 1 to 6, and the fluidity of cement mortar was determined according to GB/T2419-2005. And (3) carrying out 28d compressive strength test on the cement mortar test block, wherein the test procedure of the test block refers to the national standard GB/T17671-2021.
The test results are shown in table 1.
TABLE 1 results of the Performance test of examples 1 to 6
And (4) analyzing results: from the results in table 1, it can be seen that the hydrate inhibitor in example 1 has a small addition amount and a small proportion, the cement mortar prepared from the hydrate inhibitor has the lowest fluidity and the lowest strength, and the hydrate inhibitor in example 3 has a moderate addition amount and a moderate proportion, the fluidity of the prepared cement mortar is the best, and the strength of the cement mortar is the best.
Comparative example: the following comparative tests were conducted to examine the effects of magnetization of water, addition of hydrate inhibitor to water, magnetization of water, and addition of water and inhibitor on water activity (the higher the fluidity of cement mortar, the higher the water activity)
Comparative example 1: this comparative example refers to the formulation of example 3, which does not add hydrate inhibitor to the magnetized water, which is ready for use.
Comparative example 2: this comparative example refers to the formulation of example 3, without adding magnetized water, with the addition of clear water and a hydrate inhibitor;
comparative example 3: this comparative example refers to the formulation of example 3, using plain fresh water without the addition of magnetized water and hydrate inhibitor.
Table 2 comparative examples 1-2 cement mortar fluidity and strength results
And (4) analyzing results: as can be seen from the data of the example 3 in the table 1 and the comparative examples 1, 2 and 3 in the table 2, the fluidity and the strength of the cement mortar test block prepared by adding the clear water are only slightly improved by adding the magnetized water or the hydrate inhibitor, and the fluidity (improved by about 30 mm) and the strength (improved by about 17 MPa) of the cement mortar test block can be effectively improved by using the magnetized water and adding the hydrate inhibitor into the magnetized water.
To better illustrate that hydrate inhibitors prolong the retention time of magnetized water activity, the following tests were also performed in the present application.
Test example 1: on the basis of example 3, magnetized water is obtained by magnetization treatment, hydrate inhibitor is added, and then the mixture is respectively placed for 0min, 5min, 10min and 15minRear endThe method is used for preparing cement mortar;
test example 2: on the basis of comparative example 1, after magnetized water is obtained through magnetization treatment, the magnetized water is respectively placed for 0min, 5min, 10min and 15min to be used for preparing cement mortar;
test example 3: on the basis of comparative example 2, the magnetized water is not added, but the clear water and the hydrate inhibitor are added for 0min, 5min, 10min and 15min respectivelyIs prepared byThe results of measuring the fluidity of the cement mortar and the compressive strength of the cement mortar test piece 28d in the cement mortar test piece shown in Table 3 below
TABLE 3 fluidity and 28d compressive strength results for the sands of test examples 1-3
And (4) analyzing results: from the results in table 3 above, it can be seen that the addition of the hydrate inhibitor to the magnetized water in test example 1 can effectively improve the fluidity of the cement mortar and the strength of the cement mortar test block after 0-15 minutes, while the addition of the hydrate inhibitor to the magnetized water does not have the fluidity of the cement mortar and the strength of the cement mortar test block after 5 minutes, which is already the same as the effect of the addition of clear water in comparative example 3, and the addition of the hydrate inhibitor can prolong the retention time of the activity of the magnetized water and improve the activity of the magnetized water.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The ultra-high performance concrete is characterized by comprising the following components in parts by weight: 600-1350 parts of cement, 70-150 parts of silica fume, 200-450 parts of quartz sand, 800-1800 parts of machine-made sand, 15-75 parts of steel fiber, 15-35 parts of water reducing agent and 120-270 parts of magnetized water, wherein hydrate inhibitor is added into the magnetized water in an amount of 0.5-10 parts.
2. The ultra-high performance concrete of claim 1, wherein: the magnetized water is obtained by adopting an adjustable magnetizer for magnetization, the magnetization intensity is 260-800mT, and the water flow speed is 0.5-20m/s.
3. The ultra-high performance concrete of claim 1, wherein: the hydrate inhibitor comprises one or more of triethanolamine, carbamide, polyacrylamide, acrylamide, ammonium nitrate, potassium chloride, potassium iodide, sodium chloride and polyacrylic acid polymer, preferably one or more of ammonium nitrate, potassium chloride, potassium iodide and sodium chloride.
4. The ultra-high performance concrete of claim 1, wherein: the cement is PO42.5 grade ordinary portland cement.
5. The ultra-high performance concrete as claimed in claim 1, wherein: siO in the silica fume 2 The content is more than or equal to 95 percent, and the specific surface area is not less than 25000m 2 /kg。
6. The ultra-high performance concrete of claim 1, wherein: it is characterized in that SiO in the quartz sand 2 The content is more than or equal to 97 percent, and the content is 20-40 meshes, 40-70 meshes and 70-140 meshes of continuous gradation, and the part ratio is 2-6.
7. The ultra-high performance concrete of claim 1, wherein: the steel fiber is copper-plated micro-wire steel fiber, the length-diameter ratio is 60-70, and the tensile strength is larger than or equal to 25000MPa.
8. The ultra-high performance concrete of claim 1, wherein: the water reducing agent is a polycarboxylic acid water reducing agent, and the solid content is 40%.
9. The method for preparing the ultra-high performance concrete according to claim 1, wherein the method comprises magnetizing water by using an adjustable magnetizing device to obtain magnetized water, and metering a hydrate inhibitor into the magnetized water; and mixing and stirring the magnetized water and other components in the concrete formula to prepare the ultra-high performance concrete.
10. The method for preparing ultra-high performance concrete according to claim 9, comprising the steps of:
(1) Magnetizing tap water by using an adjustable magnetizing device, wherein the magnetization intensity of the magnetizing device is 260-800mT, the water flow speed is 0.5-20m/s, and a hydrate inhibitor is metered into the magnetizing device after the magnetizing treatment;
(2) Weighing cement and silica fume according to a formula, mixing and stirring for 30s, adding the weighed water reducer and the prepared magnetized water, and uniformly stirring to obtain slurry;
(3) And (3) sequentially adding the quartz sand and the natural sand weighed according to the formula into the slurry obtained in the step (2), uniformly stirring, adding the weighed steel fibers, uniformly stirring, filling into a mold, and curing to obtain the ultra-high performance concrete.
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| CN117164274A (en) * | 2023-11-03 | 2023-12-05 | 四川蜀道建筑科技有限公司 | Water reducer for mass concrete, preparation method and concrete |
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