CN115974477B - Ultra-high performance concrete containing rare earth polishing powder waste and preparation method thereof - Google Patents
Ultra-high performance concrete containing rare earth polishing powder waste and preparation method thereof Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 78
- 239000002699 waste material Substances 0.000 title claims abstract description 63
- 238000005498 polishing Methods 0.000 title claims abstract description 59
- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 23
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 16
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 239000004567 concrete Substances 0.000 claims abstract description 23
- 239000004575 stone Substances 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 239000000463 material Substances 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 24
- 235000012239 silicon dioxide Nutrition 0.000 claims description 22
- 239000003638 chemical reducing agent Substances 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 18
- 229910021487 silica fume Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 239000004568 cement Substances 0.000 claims description 17
- 239000010881 fly ash Substances 0.000 claims description 16
- 239000010453 quartz Substances 0.000 claims description 16
- 239000006004 Quartz sand Substances 0.000 claims description 15
- 230000000694 effects Effects 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 14
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 239000000047 product Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000001723 curing Methods 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 6
- 239000013530 defoamer Substances 0.000 claims description 6
- 150000002191 fatty alcohols Chemical class 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 6
- 235000011152 sodium sulphate Nutrition 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 239000013049 sediment Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 239000010754 BS 2869 Class F Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 230000032683 aging Effects 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 3
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 3
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 2
- 235000019738 Limestone Nutrition 0.000 claims description 2
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000004816 latex Substances 0.000 claims description 2
- 229920000126 latex Polymers 0.000 claims description 2
- 239000006028 limestone Substances 0.000 claims description 2
- 238000010907 mechanical stirring Methods 0.000 claims description 2
- 238000000053 physical method Methods 0.000 claims description 2
- 239000011435 rock Substances 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 239000002910 solid waste Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 4
- 239000002440 industrial waste Substances 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229920005646 polycarboxylate Polymers 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000008030 superplasticizer Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 101150102561 GPA1 gene Proteins 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010517 secondary reaction Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 230000003245 working effect Effects 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)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses ultra-high performance concrete containing rare earth polishing powder waste and a preparation method thereof, belonging to the technical field of concrete preparation. The invention can enhance the volume stability of the concrete while maintaining the good working performance and mechanical property of the ultra-high performance concrete; the artificial coarse aggregate manufactured by using industrial waste residues, polishing powder waste materials and waste stones can reduce manufacturing cost, realize recycling of solid waste, accord with the development trend of green ecological concrete, and facilitate better popularization and application in actual engineering.
Description
Technical Field
The invention belongs to the technical field of concrete preparation, and particularly relates to ultra-high performance concrete containing rare earth polishing powder waste and a preparation method thereof.
Background
With the rapid development of civil engineering, building engineering standards and functional requirements are continuously improved, and ultra-high performance concrete with good working performance, ultra-high strength, toughness and durability is generated to meet the requirements of various building structures. Along with the deep research, a plurality of scholars begin to mix coarse aggregate in the ultra-high performance concrete, so that the consumption of the cementing material in unit volume is relatively reduced, and the production cost is effectively reduced; meanwhile, the filling effect of the aggregate is exerted, and a rigid framework is formed, so that the volume stability and the elastic modulus of the concrete are improved, and cracking caused by self-shrinkage is effectively resisted, so that the ultra-high performance concrete containing the coarse aggregate becomes a research hot spot in recent years, and engineering application is gradually started.
At present, most coarse aggregates are high-quality aggregates such as basalt and granite with high strength and good compactness, but with the continuous increase of resource consumption, the price of the aggregates is increased year by year and continuous mass supply cannot be ensured, which is unfavorable for mass continuous production, and in addition, the price of the used superfine powder such as silica fume is high, so that the economy of the ultra-high-performance concrete containing the coarse aggregates needs to be further improved. The invention uses the industrial waste residue, rare earth polishing powder and waste and the artificial coarse aggregate manufactured by waste stones from the standpoint of recycling solid wastes and improving the performance, saves waste materials, protects environment, reduces the preparation cost of ultra-high performance concrete and reduces energy consumption, accords with the development trend of green ecological concrete, and is convenient for better popularization and application in practical engineering.
Disclosure of Invention
In view of the above, the invention aims to provide coarse aggregate ultra-high performance concrete containing rare earth polishing powder waste and a preparation method thereof, so as to solve the technical problems that the manufacturing cost of high performance concrete is high and solid waste cannot be recycled.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides ultra-high performance concrete containing rare earth polishing powder waste, which comprises water, cementing material, quartz powder, quartz sand, coarse aggregate, a water reducing agent and steel fibers.
Further, the cementing material comprises cement, fly ash, silica fume and polishing powder waste, wherein the cement accounts for 55% -65% of the total weight of the cementing material, the fly ash accounts for 15% -20% of the total weight of the cementing material, the silica fume accounts for 15% -20% of the total weight of the cementing material, and the polishing powder waste accounts for 5% -10% of the total weight of the cementing material.
Further, the polishing powder waste comprises CeO 2 、La 2 O 3 、Pr 6 O 11 。
Further, the amount of each material is expressed in kg/m 3 The weight portion of the water is 164.0 to 184.1 portions, and the adhesive1082-1093 parts of setting material, 131.2-437.2 parts of quartz powder, 196.7-655.8 parts of quartz sand and 218.6-765.1 parts of coarse aggregate; wherein the water reducer accounts for 2.0-2.3% of the gel dosage, and the steel fiber accounts for 2% of the concrete volume.
Further, the cement is 42.5-grade ordinary Portland cement, the compressive strength is 48-52 MPa, and the specific surface area is 350-420m 2 /kg；
The fly ash is class F class II, the screen fineness of 45 mu m is less than 20%, and the activity index is more than 75%;
the silica fume is 10000 meshes, the grain diameter ranges from 0.1 mu m to 2.0 mu m, and the activity index is more than 110 percent;
the specification of the quartz powder is 70-120 meshes, and the particle size range is 0.02-0.1mm;
the quartz sand has a specification of 20-70 meshes and a particle size range of 0.4-1.0mm;
the water reducer is a polycarboxylic acid high-performance water reducer, the water reducing rate is more than 35%, and the recommended mixing amount is 2.0%;
the steel fiber is copper plated flat, the diameter is 0.2mm, the length is 11-13mm, and the tensile strength is more than 2300MPa;
the coarse aggregate comprises limestone and drift line rock, and is manufactured by mechanical crushing, screening and shaping, belongs to 5-10mm continuous graded broken stone, and has clean surface and no other impurities.
Further, the preparation method of the ultra-high performance concrete containing the rare earth polishing powder waste material comprises the following steps:
s1, modifying polishing powder waste by a physical method and a chemical method;
s2, pouring cement, fly ash, silica fume, modified polishing powder waste, quartz powder and quartz sand into a stirrer for stirring;
s3, adding a water reducing agent and water into the stirrer, and continuing stirring until the mixture is granular;
s4, continuously adding coarse aggregate into the mixture, stirring uniformly, and then adding steel fibers for mechanical stirring to obtain a finished product;
s5, pouring a test piece, and vibrating and leveling on a vibrating table;
s6, curing.
Further, P1: weighing 80-120 parts of polishing powder waste, fully burning in a closed high-temperature furnace at 900-1000 ℃, naturally cooling to normal temperature in a dry environment, weighing, stopping burning when the mass loss rate is less than 0.1%, and storing the polishing powder waste cooled to the room temperature in the dry environment for later use;
p2: preparing a mixed solution of a silicon dioxide defoamer and fatty alcohol ether sodium sulfate, wherein the concentration of the silicon dioxide defoamer is controlled to be 0.4-20g/L, and the concentration of the fatty alcohol ether sodium sulfate is controlled to be 0.2-10g/L;
p3: adding the P1 treated polishing powder waste into the prepared mixed solution at room temperature, wherein the added volume is 1/10 of that of the solution, and continuously stirring the solution during the adding, wherein the stirring rate is controlled to be more than 50 r/min;
p4: after being uniformly dispersed, the mixture is put into an environment of 60-80 ℃ for heat preservation and aging for 6-8 hours so as to fully and uniformly react, and sediment is filtered;
p5: the P4 sediment is baked, and the baking is divided into 3 stages, namely, stage I: heating from room temperature to 105-120 deg.c in 3 hr, and maintaining for 2-3 hr; II section: cooling to 60-80 ℃ within 1 hour, and then preserving heat for 2-3 hours; III section: heating to 120-150 ℃ again, then preserving heat for 2-3 hours, and finally naturally cooling to normal temperature to obtain a baked product;
p6: adding hydroxypropyl methyl cellulose in an amount of 0.5-5% by mass and latex powder in an amount of 1-10% by mass into the baked product obtained in the step P5;
p7: and then carrying out uniform and repeated grinding on the mixture to control the particle size of the mixture to be in the range of 1-10 mu m, thus obtaining modified polishing powder waste.
Further, the stirring time in the step S2 is 60-90 seconds, the stirring time for adding the coarse aggregate in the step S4 is 30-60 seconds, and the stirring time for adding the steel fiber is 120-l 80 seconds.
Further, the curing method in the step S6 is to cover a film on the top surface of the test piece, stand for 24-48 hours at the temperature of 15-25 ℃ and the relative humidity of more than 50%, disassemble the mold, and cure the test piece to the standard curing condition at the temperature of 18-22 ℃ and the relative humidity of more than 95% until the test is carried out.
The invention has the beneficial effects that:
1. the invention can maintain the good working performance and mechanical property of the ultra-high performance concrete and enhance the volume stability of the concrete.
2. The artificial coarse aggregate manufactured by using industrial waste residues, polishing powder waste materials and waste stones can reduce manufacturing cost, realize recycling of solid waste, accord with the development trend of green ecological concrete, and facilitate better popularization and application in actual engineering.
3. After modification, firstly, absorbing impurities can be removed through burning, so that the positive effect of the surfactant in cement hydration is improved; secondly, the activity of harmful components such as polished matters in polishing powder waste can be reduced after modification, and secondary reaction with a polycarboxylate water reducer in concrete is avoided, so that the performance of the concrete is further influenced; finally, the modified polishing powder waste can further exert the filling effect, and the smaller particle size can fill the gaps of the cementing material, so that the system is more compact, and the compactness of the concrete is improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Detailed Description
Example 1
The ultra-high performance concrete containing the rare earth polishing powder waste comprises, by weight, 164 parts of water, 655.8 parts of cement, 164.0 parts of fly ash, 196.7 parts of silica fume, 76.5 parts of polishing powder waste, 306.0 parts of quartz powder, 459.1 parts of quartz sand, 24.05 parts of a water reducer, 327.9 parts of coarse aggregate and 156 parts of steel fiber.
The cement adopts 42.5-grade ordinary silicate cement with specific surface area of 370m 2 Kg, compressive strength 50.2MPa;
the fly ash is class F class II, the fineness of the screen residue of 45 mu m is 12.6%, and the activity index is 79.3%;
the silica fume is 10000 meshes, the grain diameter range is 0.1-2.0 mu m, and the activity index is 122%;
the waste rare earth polishing powder is white powder with the particle size of 1-10 mu m;
the specification of the quartz powder is 70-120 meshes, and the particle size range is 0.02-0.1mm;
the quartz sand has a specification of 20-70 meshes and a particle size range of 0.4-1.0mm;
the water reducer is a polycarboxylic acid high-performance water reducer, the water reducing rate is 35%, the solid content is 45%, and the recommended mixing amount is 2.0%;
the steel fiber is copper plated flat, the diameter is 0.2mm, the length is 11-13mm, and the tensile strength is more than 2300MPa;
the waste stone coarse aggregate is of 5-10mm continuous grading.
The preparation method of the ultra-high performance concrete containing the rare earth polishing powder waste comprises the following steps:
s1, pouring cement, fly ash, silica fume, modified polishing powder waste, quartz powder and quartz sand into a stirrer to stir for 75 seconds,
s2, adding a water reducing agent and water into the stirrer, and continuously stirring until the mixture is granular;
s3, continuously adding coarse aggregate into the mixture, stirring for 45 seconds, stirring the coarse aggregate and the mixture uniformly, then adding steel fibers, stirring for 120-180 seconds, and then mechanically stirring the materials, so as to obtain a finished product;
s4, pouring a test piece, vibrating on a vibrating table for 20 seconds to form;
s5, covering a film on the top surface of the test piece after forming, standing for 36 hours at the temperature of 20 ℃ and the relative humidity of more than 50%, removing the die, and curing to the specified age for carrying out the test under the standard curing condition at the temperature of 20 ℃ and the relative humidity of more than 95%.
Wherein, the polishing Fei Feiliao modification steps are as follows:
p1: weighing 100 parts of polishing powder waste, fully burning in a 950 ℃ closed high-temperature furnace, naturally cooling to normal temperature in a dry environment, weighing, stopping burning when the mass loss rate is less than 0.1%, and storing the polishing powder waste cooled to the room temperature in a furnace
The method comprises the following steps of (1) standing by in a dry environment;
p2: preparing a mixed solution of a silicon dioxide defoamer and fatty alcohol ether sodium sulfate, wherein the concentration of the silicon dioxide defoamer is controlled to be 0.4-20g/L, and the concentration of the fatty alcohol ether sodium sulfate is controlled to be 0.2-10g/L.
P3: slowly adding the P1 treated polishing powder waste into the prepared mixed solution at room temperature, wherein the added volume is 1/10 of that of the solution, and continuously stirring in the adding process, wherein the stirring speed is controlled to be more than 50r/min so as to better disperse and polish
Powder waste;
p4: after being uniformly dispersed, the mixture is put into a 70 ℃ environment for heat preservation and aging for 7 hours so as to fully and uniformly react, and then the precipitate is filtered.
P5: the P4 sediment is baked, and the baking is divided into 3 stages, namely, stage I: uniformly heating from room temperature to 110 ℃ in 3 hours, and then preserving heat for 2.5 hours; II section: cooling to 70 ℃ within 1 hour, and then preserving heat for 2.5 hours; III section: again
Heating to 135 ℃, then preserving heat for 2.5 hours, and finally naturally cooling to normal temperature to obtain a baked product;
p6: adding hydroxypropyl methylcellulose and emulsion powder into the baked product obtained by P5 according to the mass ratio of 0.5-5% and the mass ratio of 1-10%;
p7: and then carrying out uniform and repeated grinding on the mixture to control the particle size of the mixture to be in the range of 1-10 mu m, thus obtaining modified polishing powder waste.
The principle and effect of the technical scheme are as follows: firstly, an ultra-fine high-activity mineral admixture is used in the ultra-high-performance concrete, so that a filling effect, a ball effect and a secondary hydration effect are fully exerted, and the performance of an interface transition zone is optimized by the fact that potential active minerals can be subjected to secondary hydration reaction to reduce calcium hydroxide crystals generated by primary hydration and the generated calcium silicate is coagulated to fill gaps of the interface transition zone; secondly, the mixing proportion is designed based on the particle grading and close packing theory, so that the void ratio of the system is lower, the compactness of the obtained concrete is higher, and especially the particle size of the added modified polishing powder waste is between the silica fume and other cementing materials, so that the particle grading of the cementing material system tends to be more reasonable; thirdly, the silica component of the quartz aggregate is stable, the texture is hard, and the volume stability and the elastic modulus of the concrete are improved; the grain size range of the aggregate is enlarged by adding the coarse aggregate again, the grading effect is more reasonable, a continuous framework with stable volume is formed, the self-shrinkage of the concrete is restrained obviously, and the concrete cracks caused by unstable volume are reduced; and finally, the polishing powder waste and the waste stone coarse aggregate are industrial solid wastes which can be recycled, the economical efficiency is objective, the cost reduction of the ultra-high performance concrete is facilitated, and the engineering wide application is facilitated.
In order to demonstrate the superiority of the materials of the present application, examples 2-6 are also provided herein.
Example 2
164 parts of water, 655.8 parts of cement, 76.5 parts of fly ash, 196.7 parts of silica fume, 164.0 parts of polishing powder waste, 306.0 parts of quartz powder, 459.1 parts of quartz sand, 24.05 parts of water reducer, 327.9 parts of coarse aggregate and 156 parts of steel fiber;
the raw materials and the preparation method were the same as in example 1, except that the amounts were different.
Example 3
164 parts of water, 655.8 parts of cement, 164.0 parts of fly ash, 196.7 parts of silica fume, 76.5 parts of polishing powder waste, 306.0 parts of quartz powder, 459.1 parts of quartz sand, 24.05 parts of water reducer, 327.9 parts of coarse aggregate and 156 parts of steel fiber;
the raw materials and preparation methods were the same as in example 1 except that the amounts were different and the polishing powder waste was not modified.
Example 4
164 parts of water, 655.8 parts of cement, 218.6 parts of fly ash, 218.6 parts of silica fume, 0 part of polishing powder waste, 437.2 parts of quartz powder, 655.8 parts of quartz sand, 24.05 parts of water reducer, 0 part of coarse aggregate and 156 parts of steel fiber;
the raw materials and the preparation method were the same as in example 1, except that the amounts were different.
Example 5
164 parts of water, 655.8 parts of cement, 164.0 parts of fly ash, 196.7 parts of silica fume, 76.5 parts of polishing powder waste, 437.2 parts of quartz powder, 655.8 parts of quartz sand, 24.05 parts of water reducer, 0 part of coarse aggregate and 156 parts of steel fiber;
the raw materials and the preparation method were the same as in example 1, except that the amounts were different.
Example 6
164 parts of water, 655.8 parts of cement, 218.6 parts of fly ash, 218.6 parts of silica fume, 0 part of polishing powder waste, 306.0 parts of quartz powder, 459.1 parts of quartz sand, 24.05 parts of water reducer, 327.9 parts of coarse aggregate and 156 parts of steel fiber;
the raw materials and the preparation method were the same as in example 1, except that the amounts were different.
The working properties of the mixtures of examples 1 to 6 were determined for slump and expansion according to GB/T50080 Standard for Performance test of common concrete mixtures.
For examples 1 to 6, 3 test pieces of 100mm×100mm were prepared, respectively, and the compressive strength was measured by using an electronic universal tester; 6 test pieces with the dimensions of 100mm multiplied by 300mm are prepared, the static compression elastic modulus is measured by an electronic universal testing machine, and the loading system and the data processing method are carried out according to GB/T50081 common concrete mechanical property test method standard.
Table 1 test results for each example
| Sequence number | Apparent density/kg.m-3 | Slump mm | Expansion degree/mm | Compressive Strength/MPa | Elastic modulus/GPa |
| 1 | 2535 | 265 | 685 | 109.6 | 46.8 |
| 2 | 2530 | 235 | 665 | 108.4 | 45.9 |
| 3 | 2520 | 255 | 665 | 106.6 | 46.7 |
| 4 | 2515 | 275 | 690 | 122.1 | 42.1 |
| 5 | 2515 | 280 | 700 | 124.5 | 41.9 |
| 6 | 2525 | 255 | 660 | 106.7 | 45.5 |
From the above table, it can be seen that: example 1 shows that the apparent density of the concrete finished product prepared by the material and the method of the invention is increased compared with that of example 2, the grain composition is more continuous after the modified polishing powder is added, the system is more compact, and the apparent density is slightly increased; in the embodiment 3, as polishing residues and chemical reagents are remained in the unmodified polishing powder waste, the unmodified polishing powder waste is directly added into the concrete to react with the polycarboxylate superplasticizer, and the effective components are adsorbed, so that the efficiency of the polycarboxylate superplasticizer is reduced, and the performance of the concrete is further influenced; in the embodiment 5, coarse aggregate is not added, the self-shrinkage limit of the concrete is limited, the volume stability is poor, and the elastic modulus is low; the non-addition of modified polishing powder waste in example 6 was shown to have a slightly smaller apparent density of the system and a compressive strength of not 1 high because of insufficient compactibility. Therefore, the performance of the embodiment 1 reaches the maximum balance in comprehensive comparison, is beneficial to popularization in constructional engineering, and can solve the problems of solid waste circulation and high manufacturing cost.
Finally, it is noted that the above-mentioned preferred embodiments are only intended to illustrate rather than limit the invention, and that, although the invention has been described in detail by means of the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (5)
1. The ultra-high performance concrete containing the rare earth polishing powder waste is characterized by comprising water, a cementing material, quartz powder, quartz sand, coarse aggregate, a water reducing agent and steel fibers; the cementing material comprises cement, fly ash, silica fume and modified polishing powder waste, wherein the cement accounts for 55-65% of the total weight of the cementing material, the fly ash accounts for 15-20% of the total weight of the cementing material, the silica fume accounts for 15-20% of the total weight of the cementing material, and the polishing powder waste accounts for 5-10% of the total weight of the cementing material;
the dosage of each material is kg/m 3 164.0 to 184.1 parts of water, 1082 to 1093 parts of cementing material, 131.2 to 437.2 parts of quartz powder, 196.7 to 655.8 parts of quartz sand and 218.6 to 765.1 parts of coarse aggregate; wherein the water reducing agent accounts for 2.0-2.3% of the dosage of the cementing material, and the steel fiber accounts for 2% of the volume of the concrete;
the cement is 42.5-grade ordinary Portland cement, the compressive strength is 48-52 MPa, and the specific surface area is 350-420m 2 /kg；
The fly ash is class F class II, the screen fineness of 45 mu m is less than 20%, and the activity index is more than 75%;
the silica fume is 10000 meshes, the grain diameter ranges from 0.1 mu m to 2.0 mu m, and the activity index is more than 110 percent;
the water reducer is a polycarboxylic acid high-performance water reducer, the water reducing rate is more than 35%, and the recommended mixing amount is 2.0%;
the steel fiber is copper plated flat, the diameter is 0.2mm, the length is 11-13mm, and the tensile strength is more than 2300MPa;
the coarse aggregate comprises limestone and drift line rock, and is manufactured by mechanical crushing, screening and shaping, belongs to 5-10mm continuous graded broken stone, and has clean surface and no other impurities;
the method for modifying the polishing powder waste comprises the following steps: the weight portions of the components are calculated according to the weight portions,
p1: weighing 80-120 parts of polishing powder waste, fully burning in a closed high-temperature furnace at 900-1000 ℃, naturally cooling to normal temperature in a dry environment, weighing, stopping burning when the mass loss rate is less than 0.1%, and storing the polishing powder waste cooled to the room temperature in the dry environment for later use;
p2: preparing a mixed solution of a silicon dioxide defoamer and fatty alcohol ether sodium sulfate, wherein the concentration of the silicon dioxide defoamer is controlled to be 0.4-20g/L, and the concentration of the fatty alcohol ether sodium sulfate is controlled to be 0.2-10g/L;
p3: adding the P1 treated polishing powder waste into the prepared mixed solution at room temperature, wherein the added volume is 1/10 of that of the solution, and continuously stirring the solution during the adding, wherein the stirring rate is controlled to be more than 50 r/min;
p4: after being uniformly dispersed, the mixture is put into an environment of 60-80 ℃ for heat preservation and aging for 6-8 hours so as to fully and uniformly react, and sediment is filtered;
p5: the P4 sediment is baked, and the baking is divided into 3 stages, namely, stage I: heating from room temperature to 105-120 deg.c in 3 hr, and maintaining for 2-3 hr; II section: cooling to 60-80 ℃ within 1 hour, and then preserving heat for 2-3 hours; III section: heating to 120-150 ℃ again, then preserving heat for 2-3 hours, and finally naturally cooling to normal temperature to obtain a baked product;
p6: adding hydroxypropyl methyl cellulose in an amount of 0.5-5% by mass and latex powder in an amount of 1-10% by mass into the baked product obtained in the step P5;
p7: and then carrying out uniform and repeated grinding on the mixture to control the particle size of the mixture to be in the range of 1-10 mu m, thus obtaining modified polishing powder waste.
2. The ultra-high performance concrete containing rare earth polishing powder waste as claimed in claim 1, wherein the composition of the polishing powder waste is CeO 2 、La 2 O 3 、Pr 6 O 11 。
3. A method for preparing ultra-high performance concrete containing rare earth polishing powder waste according to any one of claims 1 to 2, characterized in that it comprises in particular the following steps:
s1, modifying polishing powder waste by a physical method and a chemical method;
s2, pouring cement, fly ash, silica fume, modified polishing powder waste, quartz powder and quartz sand into a stirrer for stirring;
s3, adding a water reducing agent and water into the stirrer, and continuing stirring until the mixture is granular;
s4, continuously adding coarse aggregate into the mixture, stirring uniformly, and then adding steel fibers for mechanical stirring to obtain a finished product;
s5, pouring a test piece, and vibrating and leveling on a vibrating table;
s6, curing.
4. The method for preparing ultra-high performance concrete containing rare earth polishing powder waste according to claim 3, wherein the stirring time in the step S2 is 60-90 seconds, the stirring time for adding coarse aggregate in the step S4 is 30-60 seconds, and the stirring time for adding steel fiber is 120-80 seconds.
5. The method for preparing ultra-high performance concrete containing rare earth polishing powder waste according to claim 3, wherein the curing method in step S6 is to cover a film on the top surface of a test piece, to stand for 24-48 hours at 15-25 ℃ with relative humidity > 50%, to disassemble the mold, and to cure the test piece to a specified age at 18-22 ℃ with relative humidity > 95% standard curing conditions.
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| JPH1017355A (en) * | 1996-07-03 | 1998-01-20 | Denka Grace Kk | High slump concrete and its production |
| CN101555387A (en) * | 2008-04-07 | 2009-10-14 | 北京有色金属研究总院 | Rare-earth polishing material with a core shell structure and preparation method thereof |
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