CN115872686A - Plate rock aggregate concrete - Google Patents
Plate rock aggregate concrete Download PDFInfo
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- CN115872686A CN115872686A CN202211504643.0A CN202211504643A CN115872686A CN 115872686 A CN115872686 A CN 115872686A CN 202211504643 A CN202211504643 A CN 202211504643A CN 115872686 A CN115872686 A CN 115872686A
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- 239000011435 rock Substances 0.000 title description 2
- 239000010454 slate Substances 0.000 claims abstract description 119
- 239000002893 slag Substances 0.000 claims abstract description 46
- 239000000843 powder Substances 0.000 claims abstract description 44
- 239000010881 fly ash Substances 0.000 claims abstract description 42
- 239000004568 cement Substances 0.000 claims abstract description 37
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000013538 functional additive Substances 0.000 claims abstract description 28
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 28
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 23
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 23
- 239000003513 alkali Substances 0.000 claims abstract description 21
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 19
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 claims description 18
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 9
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 9
- 239000003623 enhancer Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 26
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 22
- 239000011574 phosphorus Substances 0.000 abstract description 22
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 22
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000000126 substance Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000002035 prolonged effect Effects 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- -1 alkali metal cations Chemical class 0.000 description 4
- 239000007795 chemical reaction product Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 229910052791 calcium 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
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Inorganic materials [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 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
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Images
Classifications
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- 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 embodiment of the invention relates to the technical field of alkali-resistant aggregate reaction, in particular to slate aggregate concrete, which comprises at least four of phosphorus slag powder, fly ash, FA functional additive, graphene reinforcing agent and polyvinyl alcohol in parts by weight, and also comprises water, cement, slate fine aggregate and slate coarse aggregate; 160-171 parts of water, 266-308 parts of cement, 950-1080 parts of slate fine aggregate, 750-900 parts of slate coarse aggregate, 38-114 parts of phosphorus slag powder, 38-76 parts of fly ash, 0-3.8 parts of FA functional additive, 0-0.38 part of graphene reinforcing agent and 0-3.8 parts of polyvinyl alcohol. Through the mode, the slate aggregate concrete provided by the invention can reduce the production cost and simultaneously reduce the risk of alkali-aggregate reaction of the slate aggregate concrete, thereby prolonging the service life of the slate aggregate concrete.
Description
Technical Field
The embodiment of the invention relates to the technical field of alkali-resistant aggregate reaction, and particularly relates to a slate aggregate concrete.
Background
With the mechanization of concrete construction technology, the structure and components of concrete tend to be diversified and complicated continuously, and a large number of concrete structures are damaged due to the occurrence of alkali-aggregate reaction (AAR for short). The alkali-aggregate reaction refers to a reaction that alkali contained in cement in concrete or alkali which permeates into concrete from the outside is dissolved in concrete pore liquid and gradually reacts with active substances capable of reacting with the alkali in concrete aggregate after the concrete is hardened, and a reaction product absorbs water and expands to cause concrete cracking and strength reduction, thereby shortening the service life of the concrete.
A large amount of slates are widely distributed in the Chinese and western China, particularly in the southeast of Qian, the production cost can be reduced by using the slates as concrete aggregates, but the concrete is damaged due to alkali aggregate reaction, and the service life is shortened.
Disclosure of Invention
In view of the above problems, embodiments of the present invention provide a slate aggregate concrete to reduce production cost and reduce the risk of alkali-aggregate reaction of the slate aggregate concrete, thereby prolonging the service life of the slate aggregate concrete.
According to an aspect of an embodiment of the present invention, there is provided a slate aggregate concrete, which comprises, in parts by weight, at least four of phosphorous slag powder, fly ash, FA-functional additive, graphene reinforcing agent and polyvinyl alcohol, and further comprises water, cement, slate fine aggregate and slate coarse aggregate; 160-171 parts of water, 266-308 parts of cement, 950-1080 parts of slate fine aggregate, 750-900 parts of slate coarse aggregate, 38-114 parts of phosphorus slag powder, 38-76 parts of fly ash, 0-3.8 parts of FA functional additive, 0-0.38 part of graphene reinforcing agent and 0-3.8 parts of polyvinyl alcohol.
According to the slate aggregate concrete, the fine aggregate of the slate and the coarse aggregate of the slate are used as the aggregates of the concrete, so that the production cost is reduced, at least four of phosphorus slag powder, fly ash, FA functional additive, graphene reinforcing agent and polyvinyl alcohol and cement are added into the fine aggregate of the slate and the coarse aggregate of the slate, and 160-171 parts of water, 266-308 parts of cement, 950-1080 parts of fine aggregate of the slate, 750-900 parts of coarse aggregate of the slate, 38-114 parts of phosphorus slag powder, 38-76 parts of fly ash, 0-3.8 parts of FA functional additive, 0-0.38 part of graphene reinforcing agent and 0-3.8 parts of polyvinyl alcohol can consume a large amount of alkaline substances in the slate aggregate concrete, so that the compactness of the slate aggregate concrete is improved, the risk of alkali aggregate reaction of the slate concrete is reduced, and the service life of the slate aggregate concrete is prolonged. Meanwhile, the strength of the concrete is improved by at least four of the phosphorus slag powder, the fly ash, the FA functional additive, the graphene reinforcing agent and the polyvinyl alcohol, and the service life of the slate concrete is further prolonged. In addition, the phosphorus slag powder and the fly ash adopted by the slate aggregate concrete improve the utilization rate of industrial solid waste materials and play a role in protecting the environment.
In an alternative embodiment, the particle size of the slate fine aggregate and the slate coarse aggregate is 0.1mm to 5mm, 5mm to 10mm respectively, and the particle size of the slate fine aggregate is smaller than that of the slate coarse aggregate.
In an alternative embodiment, the particle size of the phosphorous slag powder and/or the fly ash is 1-100 μm.
In an alternative embodiment, the particle size of the phosphorous slag powder and/or the fly ash is 1-40 μm.
In an alternative embodiment, the specific Boehringer surface area of the phosphorous slag powder and/or the fly ash is 250-600 m 2 /kg。
In an alternative embodiment, the FA-functional additive includes lithium carbonate and barium nitrate.
In an alternative embodiment, the weight ratio of lithium carbonate to barium nitrate is 1 to 1.5.
In an alternative embodiment, the graphene enhancer comprises graphene oxide.
In an alternative embodiment, the cement is a P · O42.5 cement.
In an alternative embodiment, the alkali content of the cement is less than or equal to 0.6%.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic flow chart of a preparation method of slate aggregate concrete provided by the embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
The slate aggregate widely exists in the nature of the Chinese and western parts of China, if the local materials can be used, the slate aggregate can be used as the aggregate of the concrete, the production cost can be reduced, but the slate aggregate contains alkaline substances, and if the slate aggregate is directly added into the concrete, the slate aggregate concrete can be damaged due to the alkali aggregate reaction, so that the service life is shortened.
In order to solve the above problems, according to an aspect of an embodiment of the present invention, there is provided a slate aggregate concrete comprising, in parts by weight, at least four of powdered phosphorus slag, fly ash, an FA-functional additive, a graphene reinforcing agent, and polyvinyl alcohol, and further comprising water, cement, slate fine aggregates, and slate coarse aggregates; 160-171 parts of water, 266-308 parts of cement, 950-1080 parts of slate fine aggregate, 750-900 parts of slate coarse aggregate, 38-114 parts of phosphorus slag powder, 38-76 parts of fly ash, 0-3.8 parts of FA functional additive, 0-0.38 part of graphene reinforcing agent and 0-3.8 parts of polyvinyl alcohol.
The chemical components and weight percentages of the cement, the phosphorous slag and the fly ash are shown in the table 1:
TABLE 1
| Raw material | Loss of power | SiO 2 | Al 2 O 3 | Fe 2 O 3 | CaO | MgO | SO 3 | Na 2 O | K 2 O | P 2 O 5 | F |
| Cement | ～2.91 | 21.33 | 5.56 | 3.98 | 59.46 | 3.11 | 2.02 | 0.16 | 0.47 | ～ | ～ |
| Phosphorous slag powder | ～3.88 | 39.16 | 3.10 | 0.81 | 45.62 | 1.82 | ～ | ～ | 0.43 | 2.27 | 2.91 |
| Fly ash | ～2.68 | 4.45 | 49.27 | 32.78 | 4.01 | 0.63 | 1.58 | 1.83 | 2.77 | ～ | ～ |
It can be seen from table 1 that the weight percentage of alkaline substances such as CaO in the cement is higher than the weight percentage of alkaline substances in the phosphorous slag powder or fly ash, and the weight of alkaline substances carried into the slate aggregate concrete by the cement is reduced by adding the phosphorous slag powder and fly ash to the slate aggregate concrete instead of part of the cement.
As can be seen from Table 1, siO is contained in the phosphorous slag powder 2 The weight percentage of the cement is obviously higher than that of SiO in the cement 2 By utilizing the hydration activity of the phosphorus slag powder and SiO in the phosphorus slag powder 2 、Al 2 O 3 The active components and Ca (OH) 2 Etc. basic substances (Ca (OH) 2 The alkaline substances can be generated by reacting alkaline substances such as CaO in the slate aggregate, cement or phosphorous slag powder with water), and the like generate volcanic ash reaction to generate reaction products such as hydrated calcium silicate, hydrated calcium aluminate or hydrated calcium sulfoaluminate and the like, so that a large amount of Ca (OH) in the slate aggregate concrete is consumed 2 And a product with a low Ca/Si ratio is generated, alkali metal cations are chelated, the precipitation amount of the alkali metal cations such as Na +, K + and the like is reduced, the pH value of a solution permeating into concrete holes is reduced, the compactness of a concrete structure is improved, and the risk of alkali aggregate reaction of the slate aggregate concrete is further reduced, so that the service life of the slate aggregate concrete is prolonged.
The FA functional additive contains Li < + > which has smaller ionic radius and higher charge density compared with Na < + > (K < + >), and further has stronger ionic bonding force of Li < + > to S < + > than that of Na < + > (K < - >), so that the Li < + > can replace Na < + > (K < + >) in concrete to preferentially form non-expansive reaction products Li < - > -S < - > -H, and the non-expansive reaction products Li < - > -S < - > -H are more densely wrapped around the concrete, thereby preventing the erosion of the Na < + > (K < + >) to the concrete.
The FA functional additive also contains Ba < 2+ >, and because Ba < 2+ > has larger charge density, ba < 2+ > and anions capable of generating alkali aggregate reaction in concrete are electrostatically attracted, so that the Ba < 2+ > and the anions form a linked structure, the distance between ions is shortened, and the concrete loses water absorption expansion capability. Meanwhile, ba < 2+ > can enter the concrete with alkali aggregate reaction to replace Na + (K +), so that the compactness and stability of a concrete structure are improved, the water absorption expansion capacity of the concrete is reduced, the risk of alkali aggregate reaction of the slate aggregate concrete is reduced, and slate aggregates are protected from being corroded.
The graphene reinforcing agent is used as a reinforcing material to be doped into the slate aggregate concrete, so that the mechanical property and the durability of the slate aggregate concrete can be improved.
The polyvinyl alcohol is a nonionic surfactant, and has a dispersing effect on cement particles after being added into cement, so that the mixing water consumption of concrete can be reduced, and the fluidity of the slate aggregate concrete is improved. On the other hand, the polyvinyl alcohol can reduce the water consumption for mixing, so that the prepared concrete can effectively inhibit the alkali-aggregate reaction in the early stage.
According to the slate aggregate concrete, the fine aggregate of the slate and the coarse aggregate of the slate are used as the aggregates of the concrete, so that the production cost is reduced, at least four of phosphorus slag powder, fly ash, FA functional additive, graphene reinforcing agent and polyvinyl alcohol and cement are added into the fine aggregate of the slate and the coarse aggregate of the slate, and 160-171 parts of water, 266-308 parts of cement, 950-1080 parts of fine aggregate of the slate, 750-900 parts of coarse aggregate of the slate, 38-114 parts of phosphorus slag powder, 38-76 parts of fly ash, 0-3.8 parts of FA functional additive, 0-0.38 part of graphene reinforcing agent and 0-3.8 parts of polyvinyl alcohol can consume a large amount of alkaline substances in the slate aggregate concrete, so that the compactness of the slate aggregate concrete is improved, the risk of alkali aggregate reaction of the slate concrete is reduced, and the service life of the slate aggregate concrete is prolonged. Meanwhile, the strength of the concrete is improved by at least four of the phosphorus slag powder, the fly ash, the FA functional additive, the graphene reinforcing agent and the polyvinyl alcohol, and the service life of the slate concrete is further prolonged. In addition, the phosphorus slag powder and the fly ash adopted by the slate aggregate concrete improve the utilization rate of industrial solid waste materials and play a role in protecting the environment.
In an alternative embodiment, the particle size of the slate fine aggregate and the slate coarse aggregate is 0.1mm to 5mm, 5mm to 10mm, respectively, and the particle size of the slate fine aggregate is smaller than the particle size of the slate coarse aggregate.
The gradation of the slate fine aggregate in the concrete at least meets the requirement of the area II in GB/T14684, the expansion rate of the rapid mortar rod method test in 14 days is not more than 0.3 percent, and the concrete does not contain potential alkali carbonate reaction components.
The particle size of the slate aggregate is 0.1 mm-10 mm, so that the alkali aggregate reaction of the slate aggregate which is easy to occur because the particle size is less than 0.1mm can be prevented.
In an alternative embodiment, the particle size of the phosphorous slag powder and/or the fly ash is 1-100 μm.
The phosphorus slag powder and/or the fly ash with the particle size of 1-100 mu m can reduce the risk of alkali-aggregate reaction of the slate aggregate concrete.
In an alternative embodiment, the particle size of the phosphorous slag powder and/or the fly ash is 1-40 μm.
The smaller the particle size of the phosphorus slag powder and/or the fly ash is, the finer the phosphorus slag powder and/or the fly ash is, the larger the relative surface area of the phosphorus slag powder and/or the fly ash is, and the better the activation reaction of the phosphorus slag powder and/or the fly ash is, so that the phosphorus slag powder and/or the fly ash within the range of 1-40 mu m can fully generate the volcanic ash reaction, fully consume alkali in the slate aggregate concrete, and further obviously reduce the risk of the alkali aggregate reaction of the slate aggregate concrete.
In an alternative embodiment, the specific Boehringer surface area of the phosphorous slag powder and/or the fly ash is 250-600 m 2 /kg。
The Boehringer's specific surface area was measured according to the method of the national Standard "method for measuring Cement specific surface area" (GB/T8074-2008).
In an alternative embodiment, the FA-functional additive comprises lithium carbonate and barium nitrate.
The FA functional additive is lithium carbonate and barium nitrate, li + in the lithium carbonate and Ba2+ in the barium nitrate can reduce gaps of alkali-aggregate reaction of concrete, and carbonate ions in the lithium carbonate and nitrate ions in the barium nitrate cannot corrode steel in the concrete.
In an alternative embodiment, the weight ratio of lithium carbonate to barium nitrate is 1 to 1.5.
In an alternative embodiment, the graphene enhancer comprises graphene oxide.
In an alternative embodiment, the cement is a P.O 42.5 cement.
In an alternative embodiment, the alkali content of the cement is less than or equal to 0.6%.
The cement with the alkali content of less than or equal to 0.6 percent can reduce the alkalinity of the concrete, further reduce the risk of alkali-aggregate reaction of the concrete and prolong the service life of the slate concrete.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for preparing slate aggregate concrete according to an embodiment of the present invention. The preparation method of the slate aggregate concrete comprises the following steps:
the method comprises the following steps: stirring and mixing cement, phosphorus slag powder and fly ash, and then standing for 2-4 h to obtain a mixture;
step two: adding the mixture obtained in the step one, the slate fine aggregate and the slate coarse aggregate into a concrete mixer, and mixing and stirring for 90-120 s to obtain a mixture;
step three: mixing and stirring water, FA functional additive, graphene reinforcing agent and polyvinyl alcohol uniformly to obtain a mixed solution;
step four: and (4) adding the mixed solution obtained in the step three into the mixed solution obtained in the step two, and stirring for 1-2 min to obtain the slate aggregate concrete.
Slate aggregate concrete was prepared according to the above preparation method based on the weight ratio of each component in examples 1-6 and the control.
The weight ratios of the components in examples 1-6 and the control are shown in table 2 below:
TABLE 2
The weight ratios of the FA functional additive components in examples 1-6 are given in Table 3 below:
TABLE 3
The concrete obtained in the fourth step of examples 1 to 6 and the control were tested for slump according to the general concrete mixture Performance test method (GB/T50080-2002), and the test results are shown in Table 4 below.
According to the national standard of Experimental methods for Long-term Performance and durability of ordinary concrete (GB/T50082) and the Experimental regulations for Highway engineering Cement and Cement concrete (JTG 3420), the indexes of strength and expansion rate of the slate aggregate concrete obtained in the fourth step of the control group of the above examples 1-6 are tested.
Before testing the strength of the slate aggregate concrete obtained in the step four, curing the concrete for 28 days under standard conditions: pouring the concrete obtained in the fourth step into a steel mould with the thickness of 100mm multiplied by 100mm, scraping the surface of the concrete, and then placing the steel mould filled with the concrete under the standard conditions that the temperature is 20 +/-2 ℃ and the relative humidity is 95% for curing for 28 days. The results of the strength tests of the slate aggregate concrete are shown in table 4 below.
Before testing the expansion rate of the slate aggregate concrete obtained in the step four, curing the concrete under an alkaline condition for 14 days: pouring the concrete obtained in the fourth step into a steel mould with the thickness of 75mm multiplied by 280mm, scraping the surface of the concrete to be flat, then placing the steel mould filled with the concrete at normal temperature for curing for 24h, demolding the concrete after 24h, then placing the concrete into purified water with the temperature of 80 +/-2 ℃ for curing for 24h, taking out the concrete after 24h, testing the length of the concrete, and then placing the concrete into NaOH solution with the temperature of 80 +/-2 ℃ and the concentration of 1mol/L for curing for 14 days. The results of the expansion ratio test of the slate aggregate concrete are shown in table 4 below.
The slump, strength and expansion of the concrete in examples 1-6 and the control are shown in Table 4:
TABLE 4
| Slump (mm) | Strength (MPa) | Swelling ratio (%) | |
| Control group | 178 | 48.3 | 0.251 |
| Example 1 | 181 | 50.1 | 0.033 |
| Example 2 | 210 | 53.6 | 0.051 |
| Example 3 | 208 | 51.4 | 0.047 |
| Example 4 | 223 | 54.7 | 0.039 |
| Example 5 | 215 | 55.2 | 0.009 |
| Example 6 | 198 | 52.6 | 0.045 |
As can be seen from the data in table 4, when the concrete is cured for 14 days under alkaline conditions, the expansion rate of the slate aggregate concrete added with at least four of the phosphorous slag powder, the fly ash, the FA functional additive, the graphene enhancer and the polyvinyl alcohol is significantly lower than that of the slate aggregate concrete without the phosphorous slag powder, the fly ash, the FA functional additive, the graphene enhancer or the polyvinyl alcohol, and the expansion rate can reach 0.009% at the lowest. That is to say, the addition of at least four of the phosphorous slag powder, the fly ash, the FA functional additive, the graphene reinforcing agent and the polyvinyl alcohol can effectively reduce the risk of alkali-aggregate reaction of the slate aggregate concrete, thereby prolonging the service life of the slate aggregate concrete.
In general, the greater the slump of concrete, the lower the strength of concrete. As can be seen from the data in table 4, even though the slump of the slate aggregate concrete in which at least four of the phosphorous slag powder, the fly ash, the FA-functional additive, the graphene enhancer and the polyvinyl alcohol were added in examples 1 to 6 was greater than that of the slate aggregate concrete in which the phosphorous slag powder, the fly ash, the FA-functional additive, the graphene enhancer or the polyvinyl alcohol was not added in the control group, the strength of the slate aggregate concrete in examples 1 to 6 was significantly greater than that of the slate aggregate concrete in the control group after curing for 28 days under the standard conditions. That is, the addition of at least four of the phosphorous slag powder, the fly ash, the FA functional additive, the graphene reinforcing agent and the polyvinyl alcohol is helpful for improving the strength of the slate aggregate concrete, so that the service life of the slate aggregate concrete is further prolonged.
It is to be noted that technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which embodiments of the present invention belong, unless otherwise specified.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. The slate aggregate concrete is characterized by comprising at least four of phosphorous slag powder, fly ash, FA functional additive, graphene reinforcing agent and polyvinyl alcohol in parts by weight, and also comprising water, cement, slate fine aggregate and slate coarse aggregate;
160-171 parts of water, 266-308 parts of cement, 950-1080 parts of slate fine aggregate, 750-900 parts of slate coarse aggregate, 38-114 parts of phosphorous slag powder, 38-76 parts of fly ash, 0-3.8 parts of FA functional additive, 0-0.38 part of graphene reinforcing agent and 0-3.8 parts of polyvinyl alcohol.
2. The slate aggregate concrete according to claim 1, wherein the particle size of the slate fine aggregate and the slate coarse aggregate is 0.1 to 5mm, 5 to 10mm, respectively, and the particle size of the slate fine aggregate is smaller than the particle size of the slate coarse aggregate.
3. The slate aggregate concrete according to claim 1, wherein the particle size of the phosphorous slag powder and/or the fly ash is 1 to 100 μm.
4. The slate aggregate concrete according to claim 3, wherein the particle size of the phosphorous slag powder and/or the fly ash is 1 to 40 μm.
5. The slate aggregate concrete according to claim 1, wherein the powder of phosphorous slag and/or the fly ash has a Boehringer's specific surface area of 250 to 600m 2 /kg。
6. The slate aggregate concrete of claim 1, wherein the FA-functional additive comprises lithium carbonate and barium nitrate.
7. The slate aggregate concrete according to claim 6, wherein the weight ratio of the lithium carbonate to the barium nitrate is 1 to 1.5.
8. The slate aggregate concrete of claim 1, wherein the graphene enhancer comprises graphene oxide.
9. A slate aggregate concrete according to claim 1, wherein said cement is a P-O42.5 cement.
10. A slate aggregate concrete according to claim 1, wherein the alkali content of said cement is less than or equal to 0.6%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211504643.0A CN115872686A (en) | 2022-11-29 | 2022-11-29 | Plate rock aggregate concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211504643.0A CN115872686A (en) | 2022-11-29 | 2022-11-29 | Plate rock aggregate concrete |
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| Publication Number | Publication Date |
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| CN115872686A true CN115872686A (en) | 2023-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211504643.0A Pending CN115872686A (en) | 2022-11-29 | 2022-11-29 | Plate rock aggregate concrete |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109608085A (en) * | 2018-12-28 | 2019-04-12 | 内蒙古自治区水利水电勘测设计院 | A kind of alkali-aggregate reaction inhibitor |
| CN112939502A (en) * | 2021-03-09 | 2021-06-11 | 贵州宏信创达工程检测咨询有限公司 | Concrete alkali-aggregate reaction inhibitor based on industrial solid waste material and concrete |
| CN113716914A (en) * | 2021-08-16 | 2021-11-30 | 中建西部建设贵州有限公司 | High-flow concrete with slate aggregate and preparation method thereof |
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2022
- 2022-11-29 CN CN202211504643.0A patent/CN115872686A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109608085A (en) * | 2018-12-28 | 2019-04-12 | 内蒙古自治区水利水电勘测设计院 | A kind of alkali-aggregate reaction inhibitor |
| CN112939502A (en) * | 2021-03-09 | 2021-06-11 | 贵州宏信创达工程检测咨询有限公司 | Concrete alkali-aggregate reaction inhibitor based on industrial solid waste material and concrete |
| CN113716914A (en) * | 2021-08-16 | 2021-11-30 | 中建西部建设贵州有限公司 | High-flow concrete with slate aggregate and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 中国材料研究学会: ""2049中国科技与社会愿景 年新材料与未来世界"", vol. 1, 中国科技出版社, pages: 197 * |
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