CN117735903B - Coal gangue coarse aggregate pumping concrete and preparation method thereof - Google Patents
Coal gangue coarse aggregate pumping concrete and preparation method thereof Download PDFInfo
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- CN117735903B CN117735903B CN202311771976.4A CN202311771976A CN117735903B CN 117735903 B CN117735903 B CN 117735903B CN 202311771976 A CN202311771976 A CN 202311771976A CN 117735903 B CN117735903 B CN 117735903B
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- 239000004567 concrete Substances 0.000 title claims abstract description 113
- 238000005086 pumping Methods 0.000 title claims abstract description 36
- 239000003245 coal Substances 0.000 title claims description 52
- 238000002360 preparation method Methods 0.000 title abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 35
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims abstract description 21
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims abstract description 21
- 239000004568 cement Substances 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000000654 additive Substances 0.000 claims description 24
- 230000000996 additive effect Effects 0.000 claims description 23
- 239000003638 chemical reducing agent Substances 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 238000009736 wetting Methods 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 239000010881 fly ash Substances 0.000 claims description 8
- 229920005646 polycarboxylate Polymers 0.000 claims description 8
- 239000004034 viscosity adjusting agent Substances 0.000 claims description 8
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims description 7
- 229940047670 sodium acrylate Drugs 0.000 claims description 7
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical group C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 6
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 6
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 6
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 6
- 239000000176 sodium gluconate Substances 0.000 claims description 6
- 235000012207 sodium gluconate Nutrition 0.000 claims description 6
- 229940005574 sodium gluconate Drugs 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 4
- 239000011707 mineral Substances 0.000 claims description 4
- 235000010755 mineral Nutrition 0.000 claims description 4
- 235000019738 Limestone Nutrition 0.000 claims description 3
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 239000002956 ash Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- 239000011325 microbead Substances 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 229910021487 silica fume Inorganic materials 0.000 claims description 3
- -1 admixture Substances 0.000 claims description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 239000013530 defoamer Substances 0.000 claims 1
- 239000010903 husk Substances 0.000 claims 1
- 239000004566 building material Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 15
- 239000002002 slurry Substances 0.000 description 14
- 238000003756 stirring Methods 0.000 description 14
- 239000002245 particle Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 5
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 4
- 239000004327 boric acid Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000008399 tap water Substances 0.000 description 4
- 235000020679 tap water Nutrition 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 235000013339 cereals Nutrition 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011575 calcium 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
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- 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 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
本申请涉及建筑材料技术领域，具体公开了一种煤矸石粗骨料泵送混凝土及其制备方法。一种煤矸石粗骨料泵送混凝土，包括如下质量百分比比原料：煤矸石包裹料60％‑75％、水泥8％‑20％、掺合料5％‑10％、外加剂2.0％‑4.0％、水4.0％‑8％，上述原料的质量百分比之和为100％。所述煤矸石包裹料包括：煤矸石粗骨料25％‑45％、煤矸石细骨料30％‑50％、聚丙烯酸钠溶液2.7％‑6.7％、外加剂0.6％‑1.3％，余量为水，上述煤矸石包裹料各组分质量百分比之和为100％。本申请的组合物可实现煤矸石的资源化利用，有效缓解天然骨料的供给压力，其具有流动性好、强度高的优点。The present application relates to the technical field of building materials, and specifically discloses a kind of gangue coarse aggregate pumping concrete and its preparation method. A kind of gangue coarse aggregate pumping concrete, including the following mass percentage ratio raw materials: gangue wrapping material 60%-75%, cement 8%-20%, admixture 5%-10%, admixture 2.0%-4.0%, water 4.0%-8%, the sum of the mass percentages of the above raw materials is 100%. The gangue wrapping material includes: gangue coarse aggregate 25%-45%, gangue fine aggregate 30%-50%, sodium polyacrylate solution 2.7%-6.7%, admixture 0.6%-1.3%, the remainder is water, and the sum of the mass percentages of the above gangue wrapping material components is 100%. The composition of the present application can realize the resource utilization of gangue, effectively alleviate the supply pressure of natural aggregate, and it has the advantages of good fluidity and high strength.
Description
Technical Field
The application relates to the technical field of building materials, in particular to coal gangue coarse aggregate pumping concrete and a preparation method thereof.
Background
With the rapid development of economy, the scale of the infrastructure of China is continuously increased, a large amount of nonrenewable natural sand is required to be consumed for preparing concrete, and the problem of lack of natural aggregate in China is gradually highlighted due to non-controlled use. Gangue is a solid waste material which is mixed in a coal bed in the process of mining and washing coal, has low carbon content and is harder than the texture of the coal. Along with continuous exploitation of mineral resources, the yield of the gangue is continuously increased, and along with the condition of low recovery efficiency of the gangue, the occupied land area of the gangue is increased, so that the land resources of China are wasted greatly, and the water and soil around the mining area are seriously polluted by open-air stacking. The rock characteristics of the coal gangue are utilized, and the coal gangue is used as coarse aggregate to prepare concrete, so that the resource utilization of the coal gangue is realized, and the supply pressure of the natural aggregate can be effectively relieved.
However, in practical applications, gangue as an aggregate encounters some difficulties in the concrete preparation process. Because the hardness is higher, the surface is porous and rough, the friction coefficient with mortar is larger, so that the concrete slurry can receive larger resistance in the stirring and transporting processes, and finally the fluidity of the concrete slurry can be reduced, and the popularization and the utilization of the coal gangue in the concrete are affected.
Disclosure of Invention
The application provides coal gangue coarse aggregate pumping concrete and a preparation method thereof, in order to improve the fluidity of concrete slurry when coal gangue is used as aggregate.
In a first aspect, the application provides coal gangue coarse aggregate pumping concrete, which adopts the following technical scheme:
the coal gangue coarse aggregate pumping concrete comprises the following raw materials in percentage by mass:
60-75% of gangue wrapping material, 8-20% of cement, 5-10% of admixture, 2.0-4.0% of additive, 4.0-8% of water and 100% of the total mass percentage of the raw materials. The gangue coating comprises 25% -45% of gangue coarse aggregate, 30% -50% of gangue fine aggregate, 2.7% -6.7% of sodium polyacrylate, 0.6% -1.3% of additive and the balance of water, wherein the total mass percentage of the components of the gangue coating is 100%, and the sodium polyacrylate solution is prepared by mixing sodium acrylate, butyl acrylate, potassium persulfate, triethanolamine and water, wherein the weight ratio of the sodium acrylate to the butyl acrylate to the potassium persulfate to the triethanolamine to the water is (15-20) 6:1:1:100.
By adopting the technical scheme, a large amount of gangue is used as coarse aggregate, a part of cement and sand stone are replaced, the supply pressure of natural aggregate is relieved, silicate and aluminate which are main components in the gangue are subjected to hydration reaction with the cement to generate calcium silicate and calcium aluminate with high strength and high durability, and the fluidity of the gangue concrete slurry is further improved by controlling the proportion of the gangue coarse aggregate and the gangue fine aggregate and adding a certain admixture. The gangue is prepared into the wrapping material in advance, so that the surface of the aggregate is smoother, the friction force and the interaction force between ions are reduced, and the fluidity of the prepared concrete slurry is improved. And the surface of the aggregate is more compact, the pores and defects of the coal gangue are reduced, the strength of the concrete prepared from the coal gangue is improved, and the wrapping material is mixed with other components in the concrete, so that the aggregate is more uniformly distributed in the concrete, the interface between the aggregate and other components is more firm, and the compressive strength of the concrete is improved.
The sodium polyacrylate solution is used as a part of the gangue coating, the charges carried by sodium polyacrylate molecules are negative, the charges carried by the surfaces of the cement particles are positive, positive and negative charges are attracted to each other to form an electric double layer effect, the molecular chains of the polymer are anchored on the surfaces of the cement particles and extend into the aqueous solution, and the molecular chains are mutually entangled, crossed and three-dimensional hindered, so that mutual approaching among particles is hindered, steric hindrance is formed, the fluidity of the concrete is further improved, meanwhile, the particles are wrapped outside the gangue particles to help to disperse the gangue particles, gaps on the surfaces of the gangue are filled, the compactness of the concrete is improved, and the strength of the concrete is improved.
Optionally, the loose bulk density of the gangue coarse aggregate is 1100-1500kg/m 3, the continuous grading is 5-25mm, the crushing value is 10.0%, and the apparent density of the fine aggregate is 1400-1800kg/m 3, and the continuous grading is 0-4.75 mm.
By adopting the technical scheme, the performance index of the gangue aggregate influences the compressive strength of the final concrete, the density and the grain size of the gangue coarse and fine aggregates are controlled to enable the coarse and fine aggregates to be graded within a reasonable range, the good grading can reduce segregation phenomenon, the workability of slurry mixture is improved, the friction between coarse aggregates is reduced, the fluidity of concrete slurry is improved, the interlocking capacity between the coarse and fine aggregates is increased, the internal structure of the concrete is enhanced, and the prepared concrete can have higher compressive strength when bearing external load.
Optionally, the admixture is one or a mixture of more of fly ash, limestone powder, silica fume, microbeads, mineral powder, metakaolin, rice hull ash and glass powder.
By adopting the technical scheme, the admixture has smaller particle size, can fill the pores among aggregate particles, on one hand, increases the compactness of concrete, improves the strength of the concrete, and on the other hand, can reduce the internal friction force among the aggregates, thereby improving the fluidity of concrete slurry, and meanwhile, the admixture can replace a part of cement to reduce the hydration heat of the cement. Preferably, the specific surface area of the fly ash is 300-500m 2/kg, the loss on ignition is not more than 2%, the CaCO 3 content of limestone powder is more than 85%, the average grain size of the rice hull ash is 0.1-3 mu m, the loss on ignition is 10-30%, the average grain size of the glass powder is white transparent powder with 1-5 mu m, the specific surface area of the silica fume is 1800-2000m 2/kg, the loss on ignition is 2-4%, the specific surface area of the microbeads is 2200-2500m 2/kg, the activity index is more than 100%, and the used mineral powder is S95 grade slag powder with the specific surface area of 400-450m 2/kg.
Optionally, the gangue wrapping material is prepared by the following steps:
(1) Sprinkling or spraying pre-wetting the coarse and fine aggregates of the gangue respectively at least 12h in advance, and continuously lightly turning the gangue aggregates in the pre-wetting process;
(2) And (3) after the pre-wetted gangue aggregate is prepared, adding the sodium polyacrylate solution and the admixture, and uniformly mixing to obtain the gangue wrapping material.
By adopting the technical scheme, the coal gangue is light and porous, the water absorption is high, the fluidity of the concrete mixture can be reduced by directly adding the coal gangue, and the loss of fluidity with time is increased, so that the coal gangue is pretreated at least 12 hours in advance, and after the coal gangue is saturated by water absorption in advance, the coal gangue is uniformly mixed with the sodium polyacrylate solution and the additive, and the sodium polyacrylate polymer and the additive wrap the coal gangue aggregate, so that on one hand, the compatibility of the coal gangue and other raw materials in the concrete is improved, the reduction of the strength of an interface bonding area is avoided, and the strength of the concrete is improved. And the moisture absorbed in the gangue can be released again when the humidity in the concrete is insufficient in the later stage, so that the internal curing effect is achieved, and the further improvement of the concrete strength is facilitated.
Optionally, the additive consists of 5-14% of water reducer, 4-10% of slump retaining agent, 0.5-5% of retarder, 0.5-2% of viscosity modifier, 0-0.03% of air entraining agent, 0-0.03% of defoaming agent and 70-85% of water.
By adopting the technical scheme, the concrete admixture composed of a plurality of components has excellent performance, helps to improve the fluidity of concrete slurry, improves the strength of concrete, and realizes the effect of optimal concrete performance. The water reducing agent and the slump retaining agent can be adsorbed on the surface of the concrete aggregate to form a layer of film, so that the functions of reducing the water surface tension, improving the fluidity of the concrete and retaining the slump are achieved, the initial setting time and the final setting time of the concrete can be prolonged by the retarder and the viscosity modifier, the transportation and the pouring of the concrete are facilitated, the slump loss can be reduced, and the pumpability of the concrete is improved.
Optionally, the water reducer is a polycarboxylate water reducer.
Through adopting above-mentioned technical scheme, through the intensity at later stage concrete in the moisture maintenance later stage that releases in water-reducing agent and the gangue, polycarboxylate water-reducing agent makes cement hydration more abundant, the distribution more even to the dispersion effect of fine particle, and the microstructure of concrete after hardening can be improved, and grid structure is more compact, can prevent concrete slump loss and do not arouse obvious retarder, guarantees the mobility of concrete thick liquids, improves the later stage intensity of concrete.
Optionally, the slump retaining agent is sodium gluconate.
By adopting the technical scheme, the later strength of the concrete can be obviously improved compared with other slump retaining agents, and the sodium gluconate is selected as the slump retaining agent to have good system compatibility on gangue, cement and additives, so that the reinforcing effect on the concrete can be improved, the auxiliary plasticizing effect of the water reducing agent is improved, and the fluidity of the slurry is further improved.
In a second aspect, the application provides a preparation method of coal gangue coarse aggregate pumping concrete, which adopts the following technical scheme:
the preparation method of the coal gangue coarse aggregate pumping concrete comprises the following steps:
Sequentially adding cement, admixture, water and admixture into the gangue coating material, stirring and mixing, and stirring for at least 120s to obtain a uniformly mixed mixture, thus obtaining the gangue coarse aggregate pumping concrete.
Through adopting the technical scheme, the wrapping material prepared by the gangue coarse and fine aggregate and other raw material components in the concrete are stirred for at least 120 seconds to ensure that all components are fully and uniformly mixed, the transportation time is controlled within 2 hours, after the concrete reaches the site, a pump pipe is wetted by a special pipe wetting agent for pumping, meanwhile, the setting time, the slump value and the expansion value of the site concrete are sampled and measured, continuous casting is carried out after the pumping condition is met, and casting is finished at one time at the same construction position.
In summary, the application has the following beneficial effects:
1. According to the application, the gangue is adopted as the main component of the concrete, so that the supply pressure of natural aggregate is relieved, the addition proportion of the gangue coarse and fine aggregate is controlled, the fluidity of the gangue concrete slurry is improved by matching with other raw materials, the gangue aggregate is prepared into the wrapping material in advance, the natural defect of the gangue aggregate is reduced, the friction force among the aggregates is further reduced, and the fluidity of the concrete slurry is increased.
2. The admixture with a compound formula is preferably adopted in the application, and the mutual matching of all the components in the admixture helps to improve the fluidity of the concrete, is beneficial to the transportation and pouring of the concrete, improves the microstructure inside the concrete, can ensure that the concrete slurry has better fluidity in the initial stage and can help to enhance the later-stage strength of the concrete in the later stage.
3. According to the application, through the polymerization of the calcium polyacrylate polymer and cement coated on the surface of the gangue, the sodium acrylate solution is subjected to polyaddition reaction under the free radical released by the initiator to generate the linear polymer, and the linear polymer is bonded and crosslinked into a network structure under the bridging action of the crosslinking agent, so that on one hand, the gaps on the surface of the gangue are filled, the compactness of the concrete is enhanced, on the other hand, the compatibility of the gangue and other raw materials in the concrete is improved, and the strength of the concrete is enhanced.
Detailed Description
The present application will be described in further detail with reference to examples.
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The viscosity modifier is purchased from Nanjing seA new material science and technology Co., ltd, RH-420, the polycarboxylic acid water reducer is purchased from Shanghai Kaijin chemical industry, brand RHEOPLUS412, the naphthalene water reducer is purchased from Shenyang Xingzheng chemical industry Co., ltd, SNF-A, the loose bulk density of the coal gangue coarse aggregate selected in the application is 1100-1500kg/m 3 -25mm continuous grading, the crushing value is 10.0%, the apparent density of the fine aggregate is 1400-1800kg/m 3, and the continuous grading is 0-4.75 mm.
Preparation of the admixture
Preparation example 1
An admixture comprising the following components:
5% of polycarboxylate water reducer, 10% of sodium gluconate (slump retaining agent), 5% of boric acid (retarder), 0.5% of viscosity modifier, 0.03% of sodium alkylbenzenesulfonate (air entraining agent), 0.03% of aluminum silicate (defoaming agent) and 79.44% of water, preparing 10kg of additive, and uniformly stirring and mixing the components in percentage by mass.
Preparation example 2
An admixture comprising the following components:
14% of polycarboxylate water reducer, 4% of sodium gluconate (slump retaining agent), 0.5% of boric acid (retarder), 2% of viscosity modifier and 79.5% of water, 10kg of additive is prepared, and the components in percentage by mass are uniformly stirred and mixed.
Preparation example 3
An admixture comprising the following components:
14% of naphthalene water reducer, 4% of sodium gluconate (slump retaining agent), 0.5% of boric acid (retarder), 2% of viscosity modifier and 79.5% of water, 10kg of additive is prepared, and the components in percentage by mass are uniformly stirred and mixed.
Preparation example 4
An admixture comprising the following components:
14% of polycarboxylate water reducer, 4% of sodium hexametaphosphate (slump retaining agent), 0.5% of boric acid (retarder), 2% of viscosity modifier and 79.5% of water, 10kg of additive is prepared, and the components in percentage by mass are uniformly stirred and mixed.
Preparation of sodium polyacrylate solution
Preparation example 5
A sodium polyacrylate solution, the preparation comprising the steps of:
7.5kg of sodium acrylate is taken and dissolved in 50kg of water, and 3kg of butyl acrylate, 0.5kg of potassium persulfate and 0.5kg of triethanolamine are sequentially added and uniformly stirred to prepare sodium polyacrylate solution.
Preparation example 6
A sodium polyacrylate solution, the preparation comprising the steps of:
10kg of sodium acrylate is taken and dissolved in 50kg of water, and 3kg of butyl acrylate, 0.5kg of potassium persulfate and 0.5kg of triethanolamine are sequentially added and uniformly stirred to prepare sodium polyacrylate solution.
Examples
Example 1
The preparation method of the coal gangue coarse aggregate pumping concrete comprises the following steps:
step one, preparing a gangue wrapping material:
(1) Taking 15kg of coal gangue coarse aggregate and 30kg of coal gangue fine aggregate, and carrying out sprinkling or spraying pre-wetting in advance for 12 hours, wherein the coal gangue aggregate is continuously lightly turned in the pre-wetting process, so that the uniformity of the pre-wetting of the aggregate is ensured;
(2) After the pre-wetted gangue aggregate is prepared, adding 4.02kg of the sodium polyacrylate solution prepared in preparation example 5, 0.36kg of the additive prepared in preparation example 1 and 10.62kg of tap water, and uniformly mixing to obtain a gangue wrapping material;
Sequentially adding 20kg of cement, 10kg of fly ash, 8kg of water and 2kg of additive into the gangue wrapping material, stirring and mixing, and stirring for at least 120s to obtain a uniformly mixed mixture, thereby obtaining the gangue coarse aggregate pumping concrete.
Example 2
The preparation method of the coal gangue coarse aggregate pumping concrete comprises the following steps:
step one, preparing a gangue wrapping material:
(1) Taking 27kg of coal gangue coarse aggregate and 18kg of coal gangue fine aggregate, and carrying out sprinkling or spraying pre-wetting in advance for 12 hours, wherein the coal gangue aggregate is continuously lightly turned in the pre-wetting process, so that the uniformity of the pre-wetting of the aggregate is ensured;
(2) After the pre-wetted gangue aggregate is prepared, adding 2.82kg of the sodium polyacrylate solution prepared in preparation example 5, 0.78kg of the additive prepared in preparation example 1 and 11.4kg of tap water, and uniformly mixing to obtain a gangue wrapping material;
Sequentially adding 20kg of cement, 10kg of fly ash, 8kg of water and 2kg of additive into the gangue wrapping material, stirring and mixing, and stirring for at least 120s to obtain a uniformly mixed mixture, thereby obtaining the gangue coarse aggregate pumping concrete.
Example 3
The preparation method of the coal gangue coarse aggregate pumping concrete comprises the following steps:
step one, preparing a gangue wrapping material:
(1) Taking 21kg of coal gangue coarse aggregate and 24kg of coal gangue fine aggregate, and carrying out sprinkling or spraying pre-wetting in advance for 12 hours, wherein the coal gangue aggregate is continuously lightly turned in the pre-wetting process, so that the uniformity of the pre-wetting of the aggregate is ensured;
(2) After the pre-wetted gangue aggregate is prepared, adding 1.62kg of the sodium polyacrylate solution prepared in preparation example 6, 0.54kg of the additive prepared in preparation example 1 and 12.84kg of tap water, and uniformly mixing to obtain a gangue wrapping material;
Sequentially adding 20kg of cement, 10kg of fly ash, 8kg of water and 2kg of additive into the gangue wrapping material, stirring and mixing, and stirring for at least 120s to obtain a uniformly mixed mixture, thereby obtaining the gangue coarse aggregate pumping concrete.
Examples 4 to 5
The gangue coarse aggregate pumping concrete is different from example 2 in that the mass percentages of the raw materials are shown in table 1, and 100kg of the gangue coarse aggregate pumping concrete is prepared.
| Examples 1 to 3 | Example 4 | Example 5 | |
| Gangue wrapping material | 60% | 68% | 75% |
| Cement and its preparation method | 20% | 16% | 8% |
| Admixture material | 10% | 8% | 5% |
| Additive agent | 2% | 3% | 4% |
| Water and its preparation method | 8% | 5% | 8% |
Example 6
The gangue coarse aggregate pumping concrete is different from example 2 in that the additive used in this example is prepared in preparation example 2.
Example 7
The gangue coarse aggregate pumping concrete is different from example 2 in that the additive used in this example is prepared in preparation example 3.
Example 8
The gangue coarse aggregate pumping concrete is different from example 2 in that the admixture used in this example is prepared in preparation example 4.
Example 9
The preparation method of the coal gangue coarse aggregate pumping concrete comprises the following steps:
step one, preparing a gangue wrapping material, namely after preparing a gangue aggregate level, adding 2.82kg of the sodium polyacrylate solution prepared in preparation example 5, 0.78kg of the additive prepared in preparation example 1 and 11.4kg of tap water, and uniformly mixing to obtain the gangue wrapping material;
Sequentially adding 20kg of cement, 10kg of fly ash, 8kg of water and 2kg of additive into the gangue wrapping material, stirring and mixing, and stirring for at least 120s to obtain a uniformly mixed mixture, thereby obtaining the gangue coarse aggregate pumping concrete.
Comparative example
Comparative example 1
The preparation method of the coal gangue coarse aggregate pumping concrete comprises the following steps of taking 27kg of coal gangue coarse aggregate and 18kg of coal gangue fine aggregate, carrying out sprinkling or spraying prewetting in advance for 12h, continuously lightly turning the coal gangue aggregate in the prewetting process, guaranteeing the uniformity of aggregate prewetting, mixing the prewetted coal gangue aggregate, adding 22.82kg of cement, 10kg of fly ash, 19.4kg of water and 2.78kg of additive, stirring and mixing, and stirring for at least 120s to obtain a uniformly mixed mixture, thus obtaining the coal gangue coarse aggregate pumping concrete.
Performance test
Detection method/test method
According to GB50080-2016 (standard for common concrete mixture Performance test method) the apparent density and the on-site expansion degree of concrete are tested (the larger the expansion degree is, the better the fluidity of the concrete is shown);
The compressive strength of the concrete was tested according to GB/T50081-2002 Standard of Experimental methods for mechanical Properties of common concrete.
TABLE 2 Performance test results
As can be seen by combining examples 1-5 and comparative example 1 with table 2, each experimental data of examples 1-5 is superior to comparative example 1, which shows that the gangue aggregate is prepared into the wrapping material in advance and then mixed with other components in the concrete, so that the mixing of each component is more favorable, the prepared wrapping material is added into the concrete, the surface of the gangue aggregate is smoother, the interaction force between friction force and ions is reduced, the fluidity of the concrete slurry is increased, the pores and defects in the gangue can be reduced, the gangue aggregate wrapped by the sodium polyacrylate solution and the additive has good compatibility with other components in the concrete, the decrease of the strength of an interface bonding area is avoided, and the strength and fluidity of the concrete are improved.
As can be seen from the combination of example 2 and examples 6-8 and the combination of table 2, each experimental data of example 2 is better than that of examples 6-8, which shows that the components of the admixture affect the final properties of the concrete, and the polycarboxylate water reducer can be better matched with other components in the gangue concrete to maintain the early and late strength of the concrete. On one hand, the polycarboxylate water reducer helps the concrete to be distributed more uniformly in the early stage, improves the fluidity, on the other hand, improves the microstructure of the concrete in the later stage, makes the grid structure of the concrete more compact, and improves the later strength of the concrete.
As can be seen by combining the embodiment 2 with the embodiment 9 and combining the table 2, each experimental data of the embodiment 2 is better than the embodiment 9, which indicates that the pre-wetting of the gangue aggregate in advance is not only beneficial to improving the fluidity of the concrete, but also capable of releasing the moisture contained in the concrete again when the internal humidity of the concrete is insufficient in the later stage, thereby playing the role of internal curing and further improving the later stage strength of the concrete.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (7)
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| CN115974511A (en) * | 2022-12-26 | 2023-04-18 | 南通永诚惠海建设工程有限公司 | A kind of low-alkali vegetable-growing concrete based on steel slag and preparation method thereof |
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