CN115677260A - Additive for slow-setting type underwater undispersed concrete and preparation method thereof - Google Patents
Additive for slow-setting type underwater undispersed concrete and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 68
- 239000000654 additive Substances 0.000 title claims description 15
- 230000000996 additive effect Effects 0.000 title claims description 15
- 238000002360 preparation method Methods 0.000 title abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 230000000979 retarding effect Effects 0.000 claims abstract description 34
- 230000016615 flocculation Effects 0.000 claims abstract description 15
- 238000005189 flocculation Methods 0.000 claims abstract description 15
- 239000006185 dispersion Substances 0.000 claims abstract description 14
- 230000003311 flocculating effect Effects 0.000 claims abstract description 11
- 239000002131 composite material Substances 0.000 claims abstract description 5
- 238000013329 compounding Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 17
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 13
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 13
- 239000001488 sodium phosphate Substances 0.000 claims description 13
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 13
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 13
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 10
- 229910019142 PO4 Inorganic materials 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 229920003086 cellulose ether Polymers 0.000 claims description 9
- 239000010452 phosphate Substances 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- MPBVHIBUJCELCL-UHFFFAOYSA-N Ibandronate Chemical compound CCCCCN(C)CCC(O)(P(O)(O)=O)P(O)(O)=O MPBVHIBUJCELCL-UHFFFAOYSA-N 0.000 claims description 8
- 229920002401 polyacrylamide Polymers 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- 229960005236 ibandronic acid Drugs 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- LXLBEOAZMZAZND-UHFFFAOYSA-M sodium;hydroxy-[1-hydroxy-3-[methyl(pentyl)amino]-1-phosphonopropyl]phosphinate Chemical compound [Na+].CCCCCN(C)CCC(O)(P(O)(O)=O)P(O)([O-])=O LXLBEOAZMZAZND-UHFFFAOYSA-M 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 241001312219 Amorphophallus konjac Species 0.000 claims description 2
- 235000001206 Amorphophallus rivieri Nutrition 0.000 claims description 2
- 229940122361 Bisphosphonate Drugs 0.000 claims description 2
- 229920002752 Konjac Polymers 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 150000004663 bisphosphonates Chemical class 0.000 claims description 2
- 229920002678 cellulose Polymers 0.000 claims description 2
- 239000001913 cellulose Substances 0.000 claims description 2
- 235000013339 cereals Nutrition 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- XPPKVPWEQAFLFU-UHFFFAOYSA-J diphosphate(4-) Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 0.000 claims description 2
- 235000011180 diphosphates Nutrition 0.000 claims description 2
- 235000013312 flour Nutrition 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 229940005740 hexametaphosphate Drugs 0.000 claims description 2
- 239000000252 konjac Substances 0.000 claims description 2
- 235000010485 konjac Nutrition 0.000 claims description 2
- 229940048084 pyrophosphate Drugs 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 abstract description 8
- 230000014759 maintenance of location Effects 0.000 abstract description 7
- 230000009467 reduction Effects 0.000 abstract description 4
- 230000015271 coagulation Effects 0.000 abstract 1
- 238000005345 coagulation Methods 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- 239000002270 dispersing agent Substances 0.000 abstract 1
- 229920000642 polymer Polymers 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 19
- 230000008569 process Effects 0.000 description 14
- 238000012360 testing method Methods 0.000 description 12
- 239000004568 cement Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 230000036571 hydration Effects 0.000 description 9
- 238000006703 hydration reaction Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 230000002035 prolonged effect Effects 0.000 description 8
- 238000010276 construction Methods 0.000 description 5
- 229940015872 ibandronate Drugs 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920005594 polymer fiber Polymers 0.000 description 2
- 235000019976 tricalcium silicate Nutrition 0.000 description 2
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical group [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005059 dormancy Effects 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a compound preparation which is prepared by compounding HN-01 retarding component, CF-01 flocculating component, water reducing component, inorganic dispersing component, other components and water, wherein the mass percentages of the components are as follows: 3-6% of HN-01 retarding component; CF-01 flocculating component 10-14%; 35-38% of water-reducing component; 2-5% of inorganic dispersion component; 0.1 to 0.8 percent of other components; the balance of water; the HN-01 retarding component is an inorganic and organic composite modified super retarder; the CF-01 flocculation component is a powdery water-soluble organic high polymer non-dispersant. The concrete admixture provided by the invention has multiple functions of retarding coagulation, flocculation, water reduction and the like, can prolong the plastic retention and setting time of concrete, improves the anti-dispersion performance of the concrete, and adjusts the viscosity of the concrete.
Description
Technical Field
The invention belongs to the technical field of concrete admixtures, and particularly relates to a retarding type additive for underwater undispersed concrete and a preparation method thereof.
Background
The setting time of the concrete is an important index of the concrete, and plays an important role in the construction progress of the concrete and the like. For the ultra-long pile, besides the compactness of concrete during underwater pouring, the long setting time is also needed to ensure the homogeneity of the concrete in the pouring process, so that the local defects and even pile breakage caused by the fact that the lower part of the concrete is already set and the upper part of the concrete is not yet set due to the overlong pouring time are avoided.
According to GBT37990-2919 technical requirement for flocculant for concrete to be undispersed underwater, the final setting time of concrete added with flocculant should be less than 24 hours, and the initial setting time is usually required to be more than 36 hours when an overlong pile is poured underwater. Therefore, on the basis of ensuring the high-efficiency anti-dispersion of concrete, the time for plastic retention and initial setting needs to be prolonged, and meanwhile, the final setting time needs to be controlled not to be too long, so that the construction progress is prevented from being influenced by the long-time non-setting of the ultra-long pile.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the slow-setting type additive for the underwater undispersed concrete is prepared, and the controllable initial setting time of the underwater concrete in a 48-72h interval is realized.
The technical scheme of the invention is as follows:
the slow-setting type additive for the underwater undispersed concrete is prepared by compounding HN-01 slow-setting components, CF-01 flocculation components, water reducing components, inorganic dispersing components, other components and water, and comprises the following components in percentage by mass:
the balance of water.
Further, the HN-01 retarding component is one or more of phosphate, pyrophosphate, hexametaphosphate and bisphosphonate.
Further, the HN-01 retarding component is a mixture of sodium phosphate, sodium hexametaphosphate and ibandronate, and the mass ratio of the sodium phosphate: sodium hexametaphosphate: the content of the ibandronate sodium is 40-65:20-33:2-15. Sodium phosphate and sodium hexametaphosphate are easy to hydrolyze to generate phosphate radicals in aqueous solution, can be combined with calcium ions generated in the cement hydration process to generate soluble complexes, reduce the number of freely moving calcium and magnesium ions, hinder the generation rate of cement hydration products tricalcium silicate and dicalcium silicate, prolong the cement hydration process, but the concentration of the phosphate radicals is not easy to control by only adding the sodium phosphate. The environment after cement hydrolysis is an alkaline environment, sodium hexametaphosphate is easily hydrolyzed into sodium phosphate in the alkaline environment, the hydrolysis reaction is reversible, the amount of phosphate radicals in the aqueous solution is ensured, and the concentration of the phosphate radicals cannot be easily controlled due to the addition of the sodium phosphate alone. The slow setting mechanism of the phosphide is similar to that of phosphate, and the phosphide and the phosphate can generate soluble complex with calcium ion, slow down the generation rate of cement hydration products and prolong the cement hydration process.
Further, the CF-01 flocculation component is one or more of high polyacrylamide, modified cellulose, grafted konjac flour and modified cellulose ether with the particle diameter of less than 300 mu m and the molecular weight of 3000-6000 ten thousand.
Further, the CF-01 flocculation component is a mixture of high polyacrylamide and modified cellulose ether, and the mass ratio of the mixture is 38-62:38-62. The high polyacrylamide has very long molecular chains, the large-order long chains have huge adsorption surface area in water, cement paste can be adsorbed, the long chains are utilized to bridge among particles to form large-particle floccules, and the whole system is ensured not to be dispersed by water flow; after the cellulose ether is dissolved in water, the surface activity ensures that the cementing material is effectively and uniformly distributed in a system, the cellulose ether is used as a protective colloid to wrap solid particles and form a layer of lubricating film on the outer surface of the solid particles, so that the system is more stable, the fluidity of concrete in the stirring process is also improved, and the cellulose ether solution ensures that the water in the slurry is not easily lost due to the characteristics of the molecular structure of the cellulose ether solution and is gradually released in a longer period of time, so that the concrete slurry has good water retention and workability.
Furthermore, the water reducing component is a polycarboxylic acid high-performance water reducing agent, has the functions of reducing water, early strength, preventing collapse and reducing viscosity, and has the solid content of more than or equal to 25%.
Further, the other components are composite components of defoaming and air entraining, wherein the GPES type defoaming component accounts for 0.05-0.5% of the total weight, and the sulfonate air entraining component accounts for 0.05-0.3% of the total weight.
Further, the inorganic dispersion component is one or a mixture of two of nanoscale silica with the diameter of 40-200 mu m and nanoscale calcium carbonate.
Further, the inorganic dispersion component is nano-scale silicon dioxide and nano-scale calcium carbonate according to the mass ratio of 35-65:35-65 and the grain diameter is 60-100 μm.
The preparation method of the additive comprises the following steps:
1) Grinding the HN-01 retarding component, the CF-01 flocculating component and the inorganic dispersing component for 10min by using a grinder respectively, screening and taking the parts with the particle size of less than 45 mu m, weighing according to the mass ratio, and sequentially adding the parts into the water reducing component weighed according to the mass ratio for dissolving;
2) And weighing the rest components according to the mass, sequentially adding the weighed components into the ground solution, uniformly dispersing for 40-60min at the water bath temperature of 20-40 ℃, and thus obtaining the retarding type additive for the underwater undispersed concrete. When the admixture is used in concrete, the admixture dosage is 3-5% of the mass of the cementing material.
The invention has the beneficial effects that: the compounded admixture can be directly used for underwater pile concrete, and the problems that the admixture cannot achieve ultra-retarding and cannot be dispersed underwater are solved.
1. Meanwhile, HN-01 retarding component and CF-01 flocculating component are used, so that the plastic retaining and initial setting time of the concrete is effectively prolonged, and the controllability of the initial setting time of the concrete in a 48-72h interval is realized. The main body is as follows: on one hand, insoluble calcium phosphate formed by the reaction of the composite phosphide retarder and calcium hydroxide forms an insoluble film on the surface of cement particles, prolongs the hydration induction period of cement, and slows down tricalcium silicate (CS) 3 ) The hydration rate, making the cement hydration process temporarily "dormant". On the other hand, the polymer fiber flocculating agent covers the surface of the concrete cementing material to form a multilayer three-dimensional network structure compact film, so that the contact of the cementing material and water is prevented, the hydration is slowed down, and the setting time is prolonged, thereby realizing the purpose.
2. Meanwhile, HN-01 retarding component and CF-01 flocculating component are used, so that the anti-dispersion property of the concrete is effectively guaranteed. On one hand, the polymer fiber flocculant can wrap the aggregate and the cementing material through the three-dimensional network structure, so that the overall compactness of the system is enhanced, and the slurry material is not washed away in the concrete underwater pouring process; on the other hand, a film formed on the surface of the cementing material by the composite phosphide retarder has a certain wrapping effect, so that the process of dispersing cementing material particles in water is hindered, the overall compactness is improved, and the anti-dispersion performance of concrete is guaranteed. The compactness and the anti-dispersion performance can be reflected in the land-water strength ratio, the land-water strength ratio refers to the ratio of the strength of a test piece after underwater forming and land forming, and the higher the ratio is, the better the compactness is and the better the anti-dispersion performance is.
3. The HN-01 retarding component and the CF-01 flocculating component are matched with functional components such as water reducing and the like to improve the working performance of the concrete mixture. The agglomeration effect of the CF-01 flocculation component on the cementing material and the 'dormancy' effect of the glue material of the HN-01 retarding component can cause the concrete mixture to be excessively sticky and not beneficial to construction, the components of high-efficiency water reduction, collapse retention, air entraining, defoaming and the like are added, and the fluidity of the mixture is adjusted in a multi-layer and multi-dimensional manner.
4. The HN-01 retarding component and the CF-01 flocculating component are matched with functional components such as water reducing and the like, so that the additive adding flow in the concrete mixing process is simplified. Compared with the test of adding different concrete admixtures one by one, the method simplifies the process of adding the admixture in the process of premixing the ultra-retarded underwater undispersed concrete through the pretreatment and accurate metering control scheme, and effectively avoids the problems of wrong weighing, missing weighing and the like in the construction process.
5. Sodium phosphate in the HN-01 set retarding component of the present application: sodium hexametaphosphate is an inorganic component, sodium ibandronate is an organic component, even though a phosphide is an organic substance which is poor in compatibility with an aqueous solution, the molecular structure of the sodium ibandronate contains a plurality of hydroxyl groups which can improve the solubility of the phosphide in water, CF-01 flocculation components are all organic components, the sodium ibandronate of the organic substance not only plays a role in retarding, but also is fully fused with the inorganic substance in the retarding component, so that the compatibility of the whole retarding component and the organic flocculation component is better, and the concrete can further achieve the effects of ultra retarding and non-dispersion under water.
The specific implementation mode is as follows:
the concrete examples and the comparative examples of the admixture for nondispersed underwater concrete are shown in Table 1. Considering that the influence effect of water on the performance of the concrete additive is lower than that of other components, the quality of the water in the comparative example is adjusted to ensure that the proportions of the other components are consistent.
TABLE 1 formulation of additive for retarded underwater undispersed concrete (unit: g)
The use method of the additive comprises the following steps: 380 parts of cement; 100 parts of fly ash; 80 parts of silica fume; 1033 parts by weight of machine-made sand; 598 parts by weight of 5-20mm gravel; 9 parts of 20-31.5mm gravel; 171 parts by weight of water; 3-5 parts of additive for ultra-retarding underwater undispersed concrete. And (3) carrying out performance detection on the concrete mixture according to DLT5117-2000 under the test regulation of underwater undispersed concrete.
TABLE 2 concrete Performance test results
According to the test results of examples 1 to 5, the concrete prepared in example 1 has slightly inferior indexes to those of the other 4 groups, so the test results of example 1 are compared with those of comparative examples 1 and 2.
The reduction amount of the retarding component of the comparative example 1 and the retarding component of the example 1 are increased in water, other components and processes are consistent, and the experimental result shows that after the retarding component is used, the plastic retention time and the initial setting time of concrete are prolonged by more than 30 hours, and the 28-day compressive strength is also guaranteed, which indicates that the retarding component can prolong the setting time of the concrete and has no negative effect on the long-term compressive strength.
Compared with the flocculation component in the example 1, the reduction amount of the flocculation component in the comparative example 2 is increased in water, other components and processes are consistent, and the experimental result shows that the plastic retention time and the initial setting time of the concrete are prolonged by 4 hours after the flocculation component is used; the 28-day land-water strength ratio is increased by more than 20%, and the 28-day compressive strength is also guaranteed, which shows that the flocculation component plays a certain role in retarding, the anti-dispersion performance of the concrete is also enhanced, and no negative influence is caused on the long-term strength.
According to the test data, when other material components are the same, by using each embodiment of the additive scheme, the plastic retaining time and the initial setting time of the concrete are both longer than those of the comparative example, the 28d land-water strength ratio is not less than 89%, the 28-day compressive strength is both higher than those of the comparative example, and the later strength of the concrete is guaranteed. Through the above examples and comparative examples, it can be found that the use of the admixture scheme can improve the retarding of concrete.
Examples 1-5 and comparative examples 1-2 above, the ingredients of the HN-01 set retarding component were: sodium phosphate: sodium hexametaphosphate: the content of the ibandronate sodium is 60:25:15, the flocculation component is high polyacrylamide: the modified cellulose ether is 45: comparative examples 3, 4 and 5 were designed with the following ingredients, and comparative examples 3, 4 and 5 were the same as example 1 except for the retarding component.
TABLE 3 HN-01 retardation component comparative test
TABLE 4 test results of concrete properties
TABLE 5 concrete initial setting time Performance test results
| Group of | Mean initial setting time/h | Initial setting time range/h | Standard deviation of initial setting time |
| Example 1 | 48 | 46～50 | 1.58 |
| Comparative example 3 | 41 | 37～45 | 2.92 |
| Comparative example 4 | 69 | 65～72 | 3.16 |
| Comparative example 5 | 46 | 43～48 | 1.87 |
As can be seen from the test results of example 1 and comparative example 3, after sodium hexametaphosphate is added to the HN-01 retarding component, the plastic retention time and the initial setting time of the concrete are averagely prolonged by 4 hours, the initial setting time is averagely prolonged by 7 hours, and the initial setting time is more stable; from the test results of example 1 and comparative example 4, it can be seen that the use of sodium hexametaphosphate can control the setting time of concrete to be not too long and stable and ensure the early strength of concrete after the same mass of sodium hexametaphosphate and sodium phosphate is used.
From the test results of the embodiment 1 and the comparative examples 3 and 4, the sodium hexametaphosphate plays a role in adjusting, the combination of the sodium hexametaphosphate and the sodium phosphate can control the concentration of phosphate radicals in a proper range, further the setting time of the concrete is controlled, and the concrete is prevented from not setting for a long time, so that the subsequent construction progress is influenced. Although the setting time of the concrete can be changed by simply changing the amount of sodium phosphate, the initial setting time of the concrete has larger fluctuation, which is not beneficial to the development of subsequent work.
From the test results of example 1 and comparative example 5, it can be seen that ibandronate sodium has retarding and flocculation facilitating properties, in particular: after ibandronate is used in the HN-01 slow-setting component, the plastic retention time and the initial setting time of the concrete are prolonged by 2 hours, which proves that ibandronate has certain slow-setting effect; the 28-day land-water strength ratio of the concrete is increased by 4%, which proves that the organic component of ibandronate can assist the flocculant to dissolve in water, and the anti-dispersion performance of the concrete is effectively enhanced.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. The slow-setting type additive for underwater undispersed concrete is characterized by being prepared by compounding HN-01 slow-setting components, CF-01 flocculating components, water reducing components, inorganic dispersing components, other components and water, wherein the mass percentages of the components are as follows:
3-6% of HN-01 retarding component;
CF-01 flocculating component 10-14%;
35-38% of water-reducing component;
2-5% of inorganic dispersion component;
0.1 to 0.8 percent of other components;
the balance of water.
2. The admixture according to claim 1, wherein the HN-01 retarding component is one or more of phosphate, pyrophosphate, hexametaphosphate and bisphosphonate.
3. The admixture according to claim 2, wherein the HN-01 retarding component is a mixture of sodium phosphate, sodium hexametaphosphate and sodium ibandronate, and the mass ratio is sodium phosphate: sodium hexametaphosphate: the content of the ibandronate sodium is 40-65:20-33:2-15.
4. The admixture according to claim 1, wherein the CF-01 flocculation component is one or more of high polyacrylamide, modified cellulose, grafted konjac flour and modified cellulose ether with a particle diameter of less than 300 μm and a molecular weight of 3000-6000 ten thousand.
5. The admixture according to claim 4, wherein the CF-01 flocculating component is a mixture of high polyacrylamide and modified cellulose ether in a mass ratio of 38-62:38-62.
6. The admixture according to claim 1, wherein the water reducing component is a polycarboxylic acid high performance water reducing agent, has the functions of reducing water, early strength, preventing collapse and reducing viscosity, and has a solid content of not less than 25%.
7. The admixture according to claim 1, wherein the other components are composite components of defoaming and air-entraining combination, wherein the GPES type defoaming component accounts for 0.05-0.5% of the total weight, and the sulfonate type air-entraining component accounts for 0.05-0.3% of the total weight.
8. The admixture according to claim 1, wherein the inorganic dispersing component is one or a mixture of two of nanoscale silica and nanoscale calcium carbonate with a diameter of 40-200 μm.
9. The admixture according to claim 8, wherein the inorganic dispersion components are nano-scale silica and nano-scale calcium carbonate in a mass ratio of 35-65:35-65 and the grain diameter is 60-100 μm.
10. The method for preparing the admixture according to claim 1, comprising the steps of:
1) Grinding the HN-01 retarding component, the CF-01 flocculating component and the inorganic dispersing component for 10min by using a grinder respectively, screening and taking the parts with the particle size of less than 45 mu m, weighing according to the mass ratio, and sequentially adding the parts into the water reducing component weighed according to the mass ratio for dissolving;
2) And weighing the rest components according to the mass, sequentially adding the weighed components into the ground solution, uniformly dispersing for 40-60min at the water bath temperature of 20-40 ℃, and thus obtaining the retarding type additive for the underwater undispersed concrete.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211272626.9A CN115677260A (en) | 2022-10-18 | 2022-10-18 | Additive for slow-setting type underwater undispersed concrete and preparation method thereof |
| CN202311324117.0A CN117209199A (en) | 2022-10-18 | 2023-10-13 | Additive for delayed coagulation type underwater non-dispersed concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211272626.9A CN115677260A (en) | 2022-10-18 | 2022-10-18 | Additive for slow-setting type underwater undispersed concrete and preparation method thereof |
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| CN202211272626.9A Pending CN115677260A (en) | 2022-10-18 | 2022-10-18 | Additive for slow-setting type underwater undispersed concrete and preparation method thereof |
| CN202311324117.0A Withdrawn CN117209199A (en) | 2022-10-18 | 2023-10-13 | Additive for delayed coagulation type underwater non-dispersed concrete and preparation method thereof |
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| CN202311324117.0A Withdrawn CN117209199A (en) | 2022-10-18 | 2023-10-13 | Additive for delayed coagulation type underwater non-dispersed concrete and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117209199A (en) * | 2022-10-18 | 2023-12-12 | 中建西部建设(广东)有限公司 | Additive for delayed coagulation type underwater non-dispersed concrete and preparation method thereof |
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| CN107500597A (en) * | 2017-09-26 | 2017-12-22 | 江苏百瑞吉新材料有限公司 | A kind of non-dispersible underwater concrete additive and preparation method thereof |
| CN108675710A (en) * | 2018-04-25 | 2018-10-19 | 中国电力科学研究院有限公司 | A kind of non-dispersible underwater concrete and its construction method |
| CN110723949A (en) * | 2019-11-15 | 2020-01-24 | 浙江大学 | Underwater 3D printing concrete and construction method thereof |
| CN111777389A (en) * | 2020-06-29 | 2020-10-16 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Quick-setting adjustable cement-based underwater anti-dispersion ultrafast hard grouting material, preparation method and application |
| CN113461389A (en) * | 2021-07-28 | 2021-10-01 | 上海市地江建筑科技有限公司 | Ultrahigh-performance concrete suitable for underwater pouring and preparation process thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111732390B (en) * | 2020-08-09 | 2022-05-17 | 中建西部建设贵州有限公司 | Non-dispersed machine-made sand self-compacting concrete for underwater pile foundation and preparation method thereof |
| CN111848057B (en) * | 2020-08-09 | 2022-07-01 | 中建西部建设贵州有限公司 | Self-compacting concrete for super-long underwater pile foundation and preparation method thereof |
| CN115677260A (en) * | 2022-10-18 | 2023-02-03 | 中建西部建设(广东)有限公司 | Additive for slow-setting type underwater undispersed concrete and preparation method thereof |
-
2022
- 2022-10-18 CN CN202211272626.9A patent/CN115677260A/en active Pending
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2023
- 2023-10-13 CN CN202311324117.0A patent/CN117209199A/en not_active Withdrawn
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| CN107500597A (en) * | 2017-09-26 | 2017-12-22 | 江苏百瑞吉新材料有限公司 | A kind of non-dispersible underwater concrete additive and preparation method thereof |
| CN108675710A (en) * | 2018-04-25 | 2018-10-19 | 中国电力科学研究院有限公司 | A kind of non-dispersible underwater concrete and its construction method |
| CN110723949A (en) * | 2019-11-15 | 2020-01-24 | 浙江大学 | Underwater 3D printing concrete and construction method thereof |
| CN111777389A (en) * | 2020-06-29 | 2020-10-16 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Quick-setting adjustable cement-based underwater anti-dispersion ultrafast hard grouting material, preparation method and application |
| CN113461389A (en) * | 2021-07-28 | 2021-10-01 | 上海市地江建筑科技有限公司 | Ultrahigh-performance concrete suitable for underwater pouring and preparation process thereof |
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| 马清浩 等: "水泥混凝土外加剂550问", 中国建材工业出版社, pages: 118 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117209199A (en) * | 2022-10-18 | 2023-12-12 | 中建西部建设(广东)有限公司 | Additive for delayed coagulation type underwater non-dispersed concrete and preparation method thereof |
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| Publication number | Publication date |
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| CN117209199A (en) | 2023-12-12 |
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