CN116730650A - Hydration heat regulation type calcium-magnesium composite expanding agent for concrete and preparation method thereof - Google Patents
Hydration heat regulation type calcium-magnesium composite expanding agent for concrete and preparation method thereof Download PDFInfo
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- CN116730650A CN116730650A CN202310603207.7A CN202310603207A CN116730650A CN 116730650 A CN116730650 A CN 116730650A CN 202310603207 A CN202310603207 A CN 202310603207A CN 116730650 A CN116730650 A CN 116730650A
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- 238000006703 hydration reaction Methods 0.000 title claims abstract description 104
- 230000036571 hydration Effects 0.000 title claims abstract description 100
- 239000004567 concrete Substances 0.000 title claims abstract description 83
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 78
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 239000002131 composite material Substances 0.000 title claims abstract description 46
- 230000033228 biological regulation Effects 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 230000000694 effects Effects 0.000 claims abstract description 49
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 29
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 27
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000011777 magnesium Substances 0.000 claims abstract description 20
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 20
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 19
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000011575 calcium Substances 0.000 claims abstract description 17
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 claims description 39
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 29
- 239000000843 powder Substances 0.000 claims description 21
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 20
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 18
- 238000001354 calcination Methods 0.000 claims description 17
- 230000001276 controlling effect Effects 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 15
- 241000209094 Oryza Species 0.000 claims description 14
- 235000007164 Oryza sativa Nutrition 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 14
- 235000009566 rice Nutrition 0.000 claims description 14
- UFLSLGGVXPPUDQ-UHFFFAOYSA-N dicalcium oxygen(2-) Chemical class [O--].[O--].[Ca++].[Ca++] UFLSLGGVXPPUDQ-UHFFFAOYSA-N 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 13
- 235000019738 Limestone Nutrition 0.000 claims description 12
- 239000006028 limestone Substances 0.000 claims description 12
- 229910052925 anhydrite Inorganic materials 0.000 claims description 11
- 229910001570 bauxite Inorganic materials 0.000 claims description 11
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 11
- 230000009977 dual effect Effects 0.000 claims description 11
- 150000002500 ions Chemical group 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- 229920000881 Modified starch Polymers 0.000 claims description 10
- 235000019426 modified starch Nutrition 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 10
- 238000007873 sieving Methods 0.000 claims description 10
- 239000011787 zinc oxide Substances 0.000 claims description 10
- 235000019270 ammonium chloride Nutrition 0.000 claims description 9
- 239000003575 carbonaceous material Substances 0.000 claims description 9
- 239000000292 calcium oxide Substances 0.000 claims description 8
- 230000035484 reaction time Effects 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 7
- -1 polyethylene Polymers 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 239000008030 superplasticizer Substances 0.000 claims description 5
- 229920001450 Alpha-Cyclodextrin Polymers 0.000 claims description 4
- 229920000858 Cyclodextrin Polymers 0.000 claims description 4
- HFHDHCJBZVLPGP-RWMJIURBSA-N alpha-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO HFHDHCJBZVLPGP-RWMJIURBSA-N 0.000 claims description 4
- 229940043377 alpha-cyclodextrin Drugs 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 239000001095 magnesium carbonate Substances 0.000 claims description 4
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 4
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 4
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 239000001116 FEMA 4028 Substances 0.000 claims description 2
- 229920002774 Maltodextrin Polymers 0.000 claims description 2
- 239000005913 Maltodextrin Substances 0.000 claims description 2
- 238000000498 ball milling Methods 0.000 claims description 2
- WHGYBXFWUBPSRW-FOUAGVGXSA-N beta-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO WHGYBXFWUBPSRW-FOUAGVGXSA-N 0.000 claims description 2
- 235000011175 beta-cyclodextrine Nutrition 0.000 claims description 2
- 229960004853 betadex Drugs 0.000 claims description 2
- GDSRMADSINPKSL-HSEONFRVSA-N gamma-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO GDSRMADSINPKSL-HSEONFRVSA-N 0.000 claims description 2
- 229940080345 gamma-cyclodextrin Drugs 0.000 claims description 2
- 239000010903 husk Substances 0.000 claims description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 2
- 229940035034 maltodextrin Drugs 0.000 claims description 2
- 239000005543 nano-size silicon particle Substances 0.000 claims description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 2
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 8
- 230000005764 inhibitory process Effects 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 31
- 238000012360 testing method Methods 0.000 description 20
- 230000002829 reductive effect Effects 0.000 description 16
- 239000004570 mortar (masonry) Substances 0.000 description 15
- 238000012986 modification Methods 0.000 description 14
- 230000004048 modification Effects 0.000 description 14
- 238000005336 cracking Methods 0.000 description 10
- 230000009471 action Effects 0.000 description 9
- 239000002956 ash Substances 0.000 description 8
- 230000000670 limiting effect Effects 0.000 description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 238000011056 performance test Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 230000005284 excitation Effects 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 150000001669 calcium Chemical class 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
Abstract
The invention discloses a hydration heat regulation type calcium-magnesium composite expanding agent for concrete and a preparation method thereof. The hydration heat regulation type calcium-magnesium composite expanding agent for the concrete comprises the following components: magnesium expansion component, calcium expansion component, hydration heat regulation component, humidity control component and plasticizing component. The hydration heat regulation type calcium-magnesium composite expanding agent has the advantages of high expansion energy, long expansion period and good temperature inhibition effect, can well adapt to the internal temperature and humidity change of a concrete structure, reduces the water loss in the structure, compensates shrinkage by matching with the temperature change, effectively reduces the generation of shrinkage cracks of the concrete, and meanwhile, the hydration heat regulation component can reduce the internal temperature of the concrete structure, reduce the temperature shrinkage and further promote the effect of compensating shrinkage of low-activity magnesium oxide in the later period; meanwhile, the material has good adaptability to cement, has no negative influence on concrete workability and mechanical properties, and has good batch engineering application prospect.
Description
Technical Field
The invention relates to the technical field of building material concrete additives, in particular to a hydration heat regulation type calcium magnesium composite expanding agent for concrete and a preparation method thereof.
Background
The concrete is the engineering material with the largest volume and the widest application, plays a role in engineering construction of public, civil, traffic, water conservancy, municipal administration, nuclear power and the like, and cement is used as a main cementing material of the concrete, can release heat and generate volume shrinkage in the hydration process, and can cause the occurrence of cracks of a concrete structure under the influence of various shrinkage factors and constraint conditions. The cracks have adverse effects on the safety, aesthetics and durability of the structure, so how to effectively reduce the risk of cracking of the concrete structure is a hot spot of concern in the industry.
The expanding agent is a common shrinkage compensating material in concrete, and the volume expansion generated in the hydration process of the material can be utilized to effectively compensate the shrinkage of the concrete, so that the risk of cracking the structure is reduced. However, this material also finds many disadvantages in crack resistant applications, such as: the calcium oxide expanding agent has high hydration speed and strong temperature sensitivity, and can only compensate early self-shrinkage of concrete at lower ambient temperature, but can not compensate temperature shrinkage and later drying shrinkage; the calcium oxide-calcium sulfoaluminate dual-expansion source expanding agent needs a large amount of water in the hydration process, so that the shrinkage of the ultra-long and ultra-thick structural concrete with a low water-gel ratio is difficult to compensate; the magnesium oxide expanding agent has the characteristic of delayed expansion, has lower hydration activity in a low-temperature environment, and is mainly used for compensating the temperature drop shrinkage of hydraulic mass concrete. The calcium-magnesium composite expanding agent has the early expansion characteristic of calcium oxide and the delayed expansion characteristic of magnesium oxide, can effectively compensate the self-shrinkage of the concrete with the low water-cement ratio and the ultra-long and ultra-thick structure, and has limited temperature shrinkage and drying shrinkage. The Chinese patent document with publication number CN102092976A discloses an ecological mass concrete expanding agent and a preparation method thereof, magnesite tailings and dolomite tailings are uniformly mixed to prepare raw materials, the raw materials are calcined at a high temperature of 850-1200 ℃ for 60-120 min, and then are cooled in air after heat preservation for 60-90 min, and the calcium-magnesium composite expanding agent is obtained after sieving. The expanding agent prepared by the method still has the effects that the hydration speed of calcium oxide is too high, the expansion energy has larger loss in the plastic stage of cement-based materials, and the later shrinkage cannot be effectively compensated and the temperature shrinkage can be reduced. The Chinese patent document with publication number CN115180866A discloses a hydration heat regulation type magnesia high-efficiency anti-cracking agent and a preparation method thereof, wherein the preparation method is mainly prepared by compounding an expansion component and a temperature control component, the expansion component is mainly magnesium oxide expansion agent, the hydration reaction is slower, the expansion energy is smaller, a better anti-cracking effect is required under a high-temperature service environment, and early shrinkage and later drying shrinkage of concrete cannot be effectively compensated. The Chinese patent document with publication number CN113603388B discloses a concrete reinforced compact and temperature-regulating anti-cracking agent and a preparation method thereof, wherein a modified calcium-magnesium composite expansion component, an ultrafine component, a waterproof component, a temperature control component and a shrinkage reducing component are compounded, wherein the modified calcium-magnesium composite is prepared by carbonation modification, and at the modification reaction temperature of 100-150 ℃, calcium carbonate on the surface of calcium oxide particles is difficult to stably exist, and the modification effect of calcium clinker is difficult to ensure, so that the expansion agent prepared by the method cannot overcome the problem that the expansion rate of the calcium clinker is too high in a high-temperature environment, and the carbonation modification batch production process is difficult to realize, so that the large-scale application of products cannot be ensured.
Based on the above problems, there is a need to develop a temperature-controlled calcium-magnesium composite expanding agent with good environmental temperature adaptability, remarkable shrinkage compensation effect, matched expansion process and capability of inhibiting the hydration heat release rate of a concrete structure, which is capable of effectively solving the defects of cracks of the concrete structure caused by shrinkage from the aspects of reducing temperature shrinkage, compensating shrinkage, reducing drying shrinkage and improving the compactness of the concrete.
Disclosure of Invention
The invention aims to overcome the technical defects, and provides a hydration heat regulation type calcium-magnesium composite expanding agent for concrete and a preparation method thereof, which solve the technical problem that the concrete expanding agent in the prior art cannot give consideration to the dry cracking caused by temperature shrinkage, compensation shrinkage, early shrinkage, chemical shrinkage, carbonization shrinkage and drying shrinkage.
In a first aspect, the invention provides a hydration heat regulation type calcium magnesium composite expanding agent for concrete, which comprises the following components in percentage by mass: 35-50% of magnesium expansion component, 40-60% of calcium expansion component, 1-4% of hydration heat regulation component, 1-5% of humidity control component and 0.5-2% of plasticizing component; wherein the magnesium expansion component is a low-activity magnesium oxide expansion agent, the MgO content is more than or equal to 90 percent, and the reaction time is 400-600 seconds; the calcareous expansion component is ion doped and physically coated dual modified calcium oxide-calcium sulfoaluminate expansion clinker; the hydration heat regulating component comprises starch derivatives and nano regulating materials; the humidity control component is a porous carbon material; the plasticizing component is a slump-retaining superplasticizer.
In a second aspect, the invention provides a preparation method of a hydration heat regulation type calcium-magnesium composite expanding agent, which comprises the following steps: and uniformly mixing the magnesium expansion component, the calcium expansion component, the hydration heat regulating component, the humidity control component and the plasticizing component to obtain the hydration heat regulating type calcium-magnesium composite expansion agent.
Compared with the prior art, the invention has the beneficial effects that:
the hydration heat regulation type calcium-magnesium composite expanding agent disclosed by the invention has the advantages that the expansion energy is high, the expansion period is long, the temperature inhibition effect is good, the internal temperature and humidity change of a concrete structure can be well adapted, the water loss in the structure is reduced, the shrinkage is compensated by matching with the temperature change, the generation of shrinkage cracks of the concrete is effectively reduced, meanwhile, the hydration heat regulation component can reduce the internal temperature of the concrete structure, the temperature shrinkage is reduced, the later shrinkage compensation effect of low-activity magnesium oxide is further promoted, the components have obvious synergistic effect under reasonable proportion, the shrinkage cracking problem of the concrete structure is solved from the aspects of shrinkage compensation, self shrinkage reduction, temperature shrinkage and the like, meanwhile, the material has good adaptability to cement, no negative influence on the workability and mechanical property of the concrete, and the material has a good batch engineering application prospect.
Drawings
FIG. 1 shows the limiting expansion rate of the hydration heat-control type calcium-magnesium composite expansion agent for concrete prepared in the embodiment 1 of the invention on mortar at different curing temperatures.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In a first aspect, the invention provides a hydration heat regulation type calcium magnesium composite expanding agent for concrete, which comprises the following components in percentage by mass: 35-50% of magnesium expansion component, 40-60% of calcium expansion component, 1-4% of hydration heat regulating component, 1-5% of humidity control component and 0.5-2% of plasticizing component. Wherein the magnesium expansion component is a low-activity magnesium oxide expansion agent, the MgO content is more than or equal to 90 percent, and the reaction time is 400-600 seconds; the calcareous expansion component is ion doped and physically coated dual modified calcium oxide-calcium sulfoaluminate expansion clinker; the hydration heat regulating component comprises starch derivatives and nano regulating materials; the humidity control component is a porous carbon material; the plasticizing component is a slump-retaining superplasticizer.
The hydration heat regulation type calcium-magnesium composite expanding agent disclosed by the invention has the advantages that the shrinkage is compensated for a long time by matching the modified multi-expansion source expanding components with engineering conditions, the temperature shrinkage of the hydration heat regulation components is reduced, the shrinkage compensation effect is further enhanced, the drying shrinkage of the humidity control components is reduced, the action effect of the expanding components is promoted, the plasticizing components weaken the negative influence of products on the workability of concrete, and meanwhile, the uniformity of the distribution of key components in the concrete is improved, so that the cracking resistance effect of a concrete structure is comprehensively improved. The magnesium expansion component is low-activity magnesium oxide, and the MgO reaction time specified in the existing standard CBMF19-2017 magnesium oxide expansion agent for concrete is less than 300s, the MgO reaction time is controlled to be 400-600 s to match the high-temperature environment in the concrete structure under engineering conditions, the action time of shrinkage compensation and the expansion amount in the later stage of reinforcement are prolonged, but the reaction time is not too long, the magnesium oxide is too slow to react under engineering conditions due to the too long reaction time, and the shrinkage cannot be compensated. The calcium expansion component is ion doped and physically coated dual modified calcium oxide-calcium sulfoaluminate expansion clinker, and compared with single pure calcium oxide clinker and calcium oxide-calcium sulfoaluminate clinker, the clinker has the advantages of prolonged hydration period, obviously reduced temperature sensitivity, reduced hydration heat release rate, reduced negative influence on the action effect of the temperature control material and the like; the hydration heat regulating component comprises a temperature control component (starch derivative) and a nano regulating material, the nano regulating material has adsorption-dispersion action effect, the action time of the temperature control component can be regulated, the temperature control component is matched with cement hydration heat release, the temperature inhibition action effect is optimized, and meanwhile, the starch derivative (polyhydroxy organic matter) can promote the hydration reaction of a magnesium component, so that the release of expansion energy after the magnesium component is better stimulated; the humidity control component is a porous carbon material, has higher porosity and can generate a plurality of adsorption sites, thereby playing a good role in water retention and water release, not only maintaining the internal humidity of the concrete and reducing self shrinkage, but also providing a better hydration environment for the expansion component and promoting the compensation of shrinkage effect. The invention ensures that the material has high expansion energy and long expansion period, can better match engineering temperature and can better play a role in compensating shrinkage under high temperature environment by optimizing low-activity magnesium expansion components, double modification of calcium expansion components and particle grading optimization treatment. Meanwhile, the synergistic and excitation effects among the components of the expanding agent can well compensate shrinkage, reduce drying shrinkage and self-shrinkage, improve the compactness of concrete and comprehensively solve the shrinkage cracking problem of a concrete structure.
In this embodiment, the low-activity magnesium oxide expanding agent is prepared by the steps of: calcining magnesite at 1100-1200 deg.C for 30-60 min, and grinding to specific surface area of 300-400 kg/m 2 Obtaining the magnesium oxide expanding agent with low activity.
In the embodiment, the ion doped and physically coated dual modified calcium oxide-calcium sulfoaluminate expansion clinker is prepared by the following steps:
weighing limestone, anhydrite, bauxite, iron slag and zinc oxide, fully and uniformly mixing, adding water, shaking to form balls, and then drying to obtain raw materials;
calcining the raw materials, and naturally cooling to room temperature to obtain clinker;
mixing and ball milling clinker and modified polyethylene wax micropowder, sequentially sieving the powder with a 0.2mm standard sieve to obtain undersize powder, sieving the undersize powder with a 0.08mm sieve, controlling the screen residue of the undersize powder passing through the 0.08mm sieve to be 5% -15%, and combining the undersize powder and the undersize powder after sieving with the 0.08mm sieve to obtain the ion doped and physical coated dual modified calcium oxide-calcium sulfoaluminate expansion clinker.
The invention obtains the particle size meeting the requirement through twice sieving. Specifically, the first screening of the material with the diameter of 0.2mm is used for removing materials with larger particles, the hydration activity of the materials is low, the poor stability of the concrete is easily caused, and local explosion points appear; the subsequent screening through a 0.08mm screen was used to further optimize the clinker particles. If the screen residue of the 0.08mm screen is too small, the modified clinker is hydrated too quickly, which is not beneficial to compensating shrinkage in the hardening stage of the concrete; if the screen residue of the 0.08mm screen is too large, the test piece is easy to crack under the high-temperature maintenance environment.
Wherein, the raw materials for preparing the raw materials comprise the following components in percentage by weight: 80-90% of limestone, 5-10% of anhydrite, 1-5% of bauxite, 0.5-2% of iron slag and 1-5% of zinc oxide. Further, the specific surface area of the limestone, the anhydrite, the bauxite and the iron slag is 300-500 kg/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The zinc oxide is analytically pure, the CaO content in the limestone is more than or equal to 50%, and the SO in the anhydrite 3 The content of Al in bauxite is more than or equal to 48 percent 2 O 3 The content of Fe in the iron slag is more than or equal to 40 percent 2 O 3 The content is more than or equal to 30 percent.
Wherein, in the raw materials for preparing the raw materials, the water-solid ratio is (0.1-0.2): 1.
wherein, in the preparation process of the clinker, the calcination temperature is 1300-1350 ℃ and the calcination time is 30-60 min.
Wherein, the mass ratio of the clinker to the modified polyethylene wax micropowder is 100: (0.5-2). If the micro powder ratio of the modified polyethylene wax is too low, the modification effect cannot be achieved, and if the micro powder ratio of the modified polyethylene wax is too high, the product cost is not good, and the flowability of the concrete is affected. Further 100:1.
in the embodiment, the specific surface area of the ion doped and physically coated dual modified calcium oxide-calcium sulfoaluminate expansion clinker is 200-300 kg/m 2 。
In the embodiment, in the hydration heat regulating component, the mass ratio of the starch derivative to the nano regulating material is 20-25:1. The nanometer regulating component mainly has the adsorption-dispersion effect of the hydration heat regulating material, adjusts the action time of the temperature control component, is matched with cement hydration heat release, optimizes the temperature inhibition effect, and has poor matching with cement hydration heat if the proportion of the nanometer regulating component is too low, and can excessively inhibit the release of the hydration heat regulating component if the proportion of the nanometer regulating component is too high, thereby not playing the role of inhibiting the hydration heat.
In this embodiment, the starch derivative comprises at least one of α -cyclodextrin, β -cyclodextrin, γ -cyclodextrin, and maltodextrin; the nano regulating material comprises at least one of nano calcium carbonate, nano silicon dioxide, nano titanium dioxide and nano ferric oxide.
In this embodiment, the porous carbon material is prepared by the steps of: mixing and soaking rice hulls with an ammonium chloride solution, and then filtering, drying and calcining to obtain the porous carbon material. Wherein the concentration of the ammonium chloride solution is 0.5-2 mol/L, and further 1mol/L; the mass ratio of the rice husk to the ammonium chloride solution is 1: (5-20), further 1:10; the soaking temperature is room temperature, and the soaking time is more than 12 hours, specifically 24 hours; the calcination temperature is 400-600 ℃, and the calcination time is 30-60 min. In the preparation process, ammonium chloride is dispersed in rice hulls, and is decomposed into ammonia and chlorine gas during high-temperature calcination, so that the porosity of rice hull ash can be improved, the obtained porous material has more adsorption sites, and the moisturizing effect of the material can be further improved.
In the embodiment, the slump retention time of the slump retention superplasticizer is more than or equal to 2 hours, and the water reducing rate is more than or equal to 20 percent.
In a second aspect, the invention provides a preparation method of a hydration heat regulation type calcium-magnesium composite expanding agent, which comprises the following steps: and uniformly mixing the magnesium expansion component, the calcium expansion component, the hydration heat regulating component, the humidity control component and the plasticizing component to obtain the hydration heat regulating type calcium-magnesium composite expansion agent.
Example 1
The hydration heat regulation type calcium-magnesium compound expanding agent provided by the embodiment comprises the following components in percentage by mass: 40% of magnesium expansion component, 50% of calcium expansion component, 4% of hydration heat regulating component, 5% of humidity control component and 1% of plasticizing component. Wherein, the liquid crystal display device comprises a liquid crystal display device,
the magnesium expansion component is prepared by the following steps: calcining magnesite at 1100 deg.C for 60min, and grinding to specific surface area of 350kg/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The MgO content in the obtained magnesium expansion component was 91.3% and the reaction time was 580s.
The calcareous expansion component is prepared by the following steps: respectively weighing 85% of limestone, 8% of anhydrite, 3% of bauxite, 1% of iron slag and 3% of zinc oxide according to mass percent, fully and uniformly mixing, adding 15% of water in the total amount of powder, shaking to form balls, and then placing in a 105 ℃ oven for 2 hours; then placing the raw materials into an electric heating furnace, calcining for 30min at 1350 ℃, and naturally cooling to room temperature; then weighing clinker and modified polyethylene wax micropowder (Ceridust 3251) according to the mass ratio of 100:1, grinding for 45min by a ball mill, and sieving with a 0.2mm standard sieve to obtain undersize powder; sieving the powder with a sieve of 0.08mm, controlling the screen residue to be 10%, and finally combining the powder on the sieve and the powder under the sieve after sieving with the sieve of 0.08mm to obtain a calcareous expansion component; wherein the specific surface areas of limestone, anhydrite, bauxite and iron slag are respectively 480kg/m 2 、420kg/m 2 、390kg/m 2 And 310kg/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The zinc oxide is analytically pure, the CaO content in the limestone is 51.2 percent, and the SO in the anhydrite 3 Content of Al in bauxite 48.6% 2 O 3 The content of Fe in the iron slag is 41.3 percent 2 O 3 The content is 32.5%.
Hydration heat regulating component: is prepared by mixing alpha-cyclodextrin and nano calcium carbonate according to the mass percentage of 20:1.
The humidity control component is prepared by the following steps: mixing rice hulls with 1mol/L ammonium chloride solution according to a mass ratio of 1:10, soaking at room temperature, and standing for 24 hours; filtering and drying the rice hull ash, calcining at 520 ℃ for 60min, and naturally cooling to room temperature to obtain porous rice hull ash.
Plasticizing component: model C900 from february technologies inc.
Example 2
The present example is substantially the same as example 1, except that the hydration heat regulating component is formed by mixing alpha-cyclodextrin and nano calcium carbonate according to a mass percentage of 25:1.
Example 3
This example is substantially the same as example 1 except that 50% of the magnesium-based expansion component, 40% of the calcium-based expansion component, 3% by weight of the hydration heat controlling component, 5% by weight of the humidity controlling component and 2% by weight of the plasticizing component are used.
Example 4
This example is substantially the same as example 1 except that 35% of magnesium-based expansion component, 60% of calcium-based expansion component, 2.5% of hydration heat controlling component, 2% of humidity controlling component and 0.5% of plasticizing component.
Comparative example 1
This comparative example is substantially the same as example 1, except that the magnesium oxide satisfies the S-type magnesium oxide specified in Standard CBMF19-2017 magnesium oxide expander for concrete, and the activity time is 220S.
Comparative example 2
This comparative example is substantially the same as example 1 except that zinc oxide is not added during the preparation of the calcareous expansion component, and the equivalent amount of iron slag is used instead.
Comparative example 3
This comparative example is substantially the same as example 1 except that the calcium expansive component was prepared without being subjected to physical coating modification treatment.
Comparative example 4
This comparative example is essentially the same as example 1 except that zinc oxide is not added during the preparation of the calcareous expansion component, instead of the equivalent iron slag, and no subsequent physical coating modification is performed.
Comparative example 5
This comparative example is substantially the same as example 1 except that the calcium expansive component was controlled to pass through a 0.08mm sieve by 25% during its preparation.
Comparative example 6
This comparative example is substantially the same as example 1 except that the hydration heat regulating component is replaced with limestone powder, an inert material.
Comparative example 7
This comparative example was substantially the same as example 1 except that the hydration heat controlling component was only a starch derivative, and the content of the hydration heat controlling component was the same as example 1.
Comparative example 8
This comparative example is essentially the same as example 1 except that the moisture controlling component is prepared from rice hull ash which is directly calcined at high temperature without being soaked in ammonium chloride solution.
Test examples
Performance tests were conducted on the hydration heat-controlling type calcium-magnesium composite expanding agents prepared in the above examples 1 to 4 and comparative examples 1 to 8.
(1) The standard of reference is industry standard JC/T2608-2021 concrete hydration temperature rise inhibitor, the hydration heat regulating type calcium magnesium compound expanding agent is added according to 10 percent (internal mixing) of the total mass fraction of the cementing material, and the test results of the test of the hydration heat reduction rate of the mortar of each example and comparative example are shown in table 1.
TABLE 1 test results of hydration heat reduction rate of calcium-magnesium composite expanding agent mortar with hydration heat regulation
The test results in table 1 above can be seen: the hydration heat reduction rate of the mortar after the hydration heat regulating type calcium magnesium composite expanding agent is doped can exceed 50 percent, is far higher than the technical index that the hydration heat reduction rate of the mortar specified in the standard JC/T2608-2021 concrete hydration temperature rise inhibitor is not less than 30 percent at the molding temperature of 20+/-1 ℃, and can be obviously improved by the double modified calcium clinker compared with the single modified calcium clinker and the unmodified calcium clinker through the comparative examples 2, 3 and 4, and can be improved to 61.2 percent from 35.4 percent after the double modification, meanwhile, the embodiment 2 can show that the hydration heat regulating component has obvious effect on the 24-hour hydration heat reduction rate, has little influence on the 7-d hydration heat reduction rate and slightly improves the hydration heat reduction rate compared with the standard group. On the other hand, the expansion agent has a larger temperature inhibition effect influenced by the ambient temperature, and the temperature is higher and the temperature inhibition effect is reduced to a certain extent, so that the concrete is ensured not to have the adverse phenomena of super retarding and even permanent non-coagulation under the high-temperature environment, and the safety of the structure is further ensured.
(2) The mortar expansion limiting performance test under different curing temperatures is based on the standard of industry standard group standard T/CECS 10082-2020, calcium magnesium composite expansion agent for concrete, hydration heat regulating type calcium magnesium composite expansion agent is added according to 10 percent (internal mixing) of the total mass fraction of the cementing material, and the mortar expansion limiting rate results under different curing temperatures are shown in tables 2, 3 and 4.
Table 2 test results of limiting expansion ratio of calcium-magnesium composite expansion agent mortar doped with hydration heat regulation and control under water-curing condition at 20 DEG C
Table 2 shows that after the hydration heat regulation type calcium-magnesium composite expanding agent is doped, the mortar test piece has larger limited expansion rate under the water curing condition of 20 ℃ and is still continuously expanded after curing to 60 days. From comparative examples 2, 3 and 4, it can be seen that the expansion energy is increased after the calcareous clinker is modified, and the main action principle is that the modification can greatly reduce the expansion loss in the plastic stage, thereby improving the later compensating shrinkage effect. As can be seen from comparative example 6, the addition of the hydration heat controlling component did not reduce the limiting expansion rate, indicating that the temperature controlling component had a certain excitation effect under the curing condition. As can be seen from comparative example 8, the release of expansion energy is better promoted by modifying the rice hull ash.
Table 3 results of test of limiting expansion rate of calcium-magnesium composite expansion agent mortar doped with hydration heat regulation and control under water-curing condition at 40 DEG C
Table 3 above shows that: under the water-curing condition of 40 ℃, the limited expansion rate of the water-doped thermal regulation type calcium-magnesium composite expansion agent mortar test piece shows continuous expansion. From example 1, it can be seen that the expansion rate increases gradually with the age, which shows that the early expansion energy increase is driven by hydration of the calcareous expansion component, and the expansion rate is limited to increase rapidly before the curing age is 14d, and the later expansion rate increase is mainly influenced by the magnesian component; from comparative examples 2, 3 and 4, the modification of clinker can obviously improve the loss of expansion energy in a plastic stage, and the double modification effect is better; as can be seen from comparative example 6, the limitation of expansion rate was reduced without adding the hydration heat controlling component, which indicates that the temperature controlling component has a certain excitation effect on expansion energy under the curing condition, which is consistent with the conclusion under the curing condition of 20 ℃. As can be seen from comparative example 8, the modified rice hull ash is more synergistic in stimulating the expansion rate development.
Table 4 test results of limiting expansion rate of calcium-magnesium composite expansion agent mortar mixed with hydration heat regulation under water-curing condition at 60 DEG C
As can be seen from the above table 4, under the water curing condition of 60 ℃, the limited expansion rate of the water-doped thermal regulation type calcium-magnesium composite expansion agent mortar test piece still shows continuous expansion, the limited expansion rate increases by more than 0.03% from 3d to 60d, and the higher the magnesium component ratio is, the larger the increase value is; as can be seen from comparative example 1, the magnesium oxide activity time has a larger effect on the late expansion, and the lower the activity value, the larger the late expansion amount; from comparative examples 2, 3, 4 it can be seen that the modification of the calcareous clinker has a significant effect on the expansion energy, mainly because by modification it is possible to reduce its ineffective expansion in the plastic phase; as can be seen from comparative example 5, the control of the particle fineness has a significant effect on the stability of test of the test piece, the fineness is too large, the test piece is easy to crack, and effective data detection cannot be formed; as can be seen from comparative example 6, the limitation of expansion rate is reduced without adding the hydration heat regulating component, and the expansion rate is more remarkable than that at 20 ℃ and 40 ℃, which indicates that the temperature regulating component has more remarkable excitation effect on the expansion energy under the high temperature condition; as can be seen from comparative example 8, the modified rice hull ash further promotes the release of expansion energy.
(3) Concrete performance test
The expanding agent is mixed into C40 concrete, and the proportion is as follows: 280 parts of P.O 42.5 ordinary Portland cement, 70 parts of S95 mineral powder, 60 parts of II-grade fly ash, 760 parts of river sand, 1030 parts of broken stone, 7 parts of polycarboxylate water reducer, 170 parts of mixed water and 30 parts of hydration heat regulation type calcium magnesium compound expansion agent, and the concrete compression strength is tested by referring to national standard GB/T50080-2016 ' ordinary concrete mixture performance test method standard ', the compressive strength of concrete is tested by national standard GB/T50081-2002 ' ordinary concrete mechanical performance test method standard ', the shrinkage rate of concrete is tested by national standard GB/T50082-2009 ' ordinary concrete long-term performance and durability test method standard ', the penetration height of concrete water-proofing agent ' is tested by industrial standard JC/T474-2008 ' mortar and concrete water-proofing agent ', the test water pressure is 1.2MPa, the constant pressure is 72h, and the test results are shown in Table 5.
TABLE 5 test results of Performance test of concrete incorporating hydration heat controlled calcium magnesium composite expansion agent
As can be seen from table 5, the fluidity of the concrete is remarkably enhanced after the hydration heat regulation type calcium-magnesium composite expanding agent is added in the examples, and the slump loss is remarkably reduced after the concrete is left for 1 h; the compressive strength of the concrete test pieces at each age is improved compared with that of the standard group, which shows that the expanding agent can improve the compactness of the concrete and is beneficial to the long-term mechanical property; the shrinkage effect of concrete drying can be reduced, and compared with a blank group, the shrinkage rate can be reduced by more than 20%, and particularly, compared with comparative example 8, the shrinkage rate is obviously improved by modifying rice hull ash; from the penetration height data, the swelling agent can improve the compactness of the concrete, and compared with the standard group, the penetration height ratio is less than 50%.
FIG. 1 shows the limiting expansion rate of the hydration heat-control type calcium-magnesium composite expansion agent for concrete prepared in the embodiment 1 of the invention on mortar at different curing temperatures. As can be seen from FIG. 1, the expansion agent has higher expansion energy and longer expansion process at different curing temperatures, and the limited expansion rate still shows increase during curing 120d, which indicates that the material has better temperature matching characteristic and longer compensation shrinkage window period at different environmental temperatures.
From the test results, the hydration heat regulation type calcium magnesium compound expansion agent can simultaneously meet the requirements of key technical indexes such as the standard JC/T2608-2021 (concrete hydration temperature rise inhibitor) that the hydration heat reduction rate is more than or equal to 30 percent, the group standard T/CECS 10082-2020 (calcium magnesium compound expansion agent for concrete) that the water-curing 7d limit expansion rate at 20 ℃ is more than or equal to 0.05 percent, the 28d-3d limit expansion rate difference value under 60 ℃ water-curing condition is between 0.015 percent and 0.06 percent, and the like, and all the components show better synergistic effect, and have longer compensation shrinkage action time and temperature adaptability.
The scheme of the invention solves the problems of rapid hydration reaction, large expansion energy loss in the plastic stage, poor temperature adaptability and the like of the calcareous expansion agent, simultaneously solves the problems of slow hydration reaction rate, small expansion energy and the like of the magnesia expansion agent, well inhibits early hydration heat release of concrete, can effectively avoid temperature shrinkage caused by rapid temperature rise in the structure, further reduces the temperature shrinkage, matches the temperature compensation shrinkage, effectively reduces the drying shrinkage and enhances the compaction effect, thereby comprehensively improving the cracking resistance of the concrete structure.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any of various other corresponding changes and modifications made according to the technical idea of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. The hydration heat regulation type calcium-magnesium composite expanding agent for the concrete is characterized by comprising the following components in percentage by mass: 35-50% of magnesium expansion component, 40-60% of calcium expansion component, 1-4% of hydration heat regulation component, 1-5% of humidity control component and 0.5-2% of plasticizing component; wherein, the liquid crystal display device comprises a liquid crystal display device,
the magnesium expansion component is a low-activity magnesium oxide expansion agent, the MgO content is more than or equal to 90%, and the reaction time is 400-600 s;
the calcium expansion component is ion doped and physically coated dual modified calcium oxide-calcium sulfoaluminate expansion clinker;
the hydration heat regulating component comprises a starch derivative and a nano regulating material;
the humidity control component is a porous carbon material;
the plasticizing component is a slump retaining super plasticizer.
2. The hydration heat regulating type calcium magnesium composite expanding agent for concrete according to claim 1, wherein the low-activity magnesium oxide expanding agent is prepared by the following steps: calcining magnesite at 1100-1200 deg.C for 30-60 min, and grinding to specific surface area of 300-400 kg/m 2 Obtaining the magnesium oxide expanding agent with low activity.
3. The hydration heat regulating and controlling type calcium-magnesium composite expanding agent for concrete according to claim 1, wherein the ion doping and physical coating dual modified calcium oxide-calcium sulfoaluminate expanding clinker is prepared by the following steps:
weighing limestone, anhydrite, bauxite, iron slag and zinc oxide, fully and uniformly mixing, adding water, shaking to form balls, and then drying to obtain raw materials;
calcining the raw materials, and naturally cooling to room temperature to obtain clinker;
mixing and ball milling clinker and modified polyethylene wax micropowder, sieving the powder with a 0.2mm standard sieve to obtain undersize powder, sieving the undersize powder with a 0.08mm sieve, controlling the screen residue of the undersize powder passing through the 0.08mm sieve to be 5% -15%, and combining the undersize powder and the undersize powder after passing through the 0.08mm sieve to obtain the ion doped and physical coated dual modified calcium oxide-calcium sulfoaluminate expansion clinker.
4. The hydration heat-control type calcium-magnesium composite expanding agent for concrete according to claim 3, wherein in the preparation process of the ion doping and physical coating dual modified calcium oxide-calcium sulfoaluminate expanding clinker, raw materials for preparing raw materials comprise, in percentage by weight: 80-90% of limestone, 5-10% of anhydrite, 1-5% of bauxite, 0.5-2% of iron slag and 1-5% of zinc oxide; the specific surface area of the limestone, the anhydrite, the bauxite and the iron slag is 300-500 kg/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The zinc oxide is analytically pure, the CaO content in the limestone is more than or equal to 50%, and the SO in the anhydrite 3 The content of Al in bauxite is more than or equal to 48 percent 2 O 3 The content of Fe in the iron slag is more than or equal to 40 percent 2 O 3 The content is more than or equal to 30 percent; the water-solid ratio is (0.1-0.2): 1, a step of; the calcination temperature is 1300-1350 ℃, and the calcination time is 30-60 min; the mass ratio of the clinker to the modified polyethylene wax micropowder is 100: (0.5-2); the specific surface area of the ion doped and physically coated dual modified calcium oxide-calcium sulfoaluminate expansion clinker is 200-300 kg/m 2 。
5. The hydration heat-control type calcium-magnesium composite expanding agent for concrete according to claim 1, wherein the mass ratio of the starch derivative to the nano-control material in the hydration heat-control component is 20-25:1.
6. The hydration heat-controlling calcium-magnesium composite expanding agent for concrete according to claim 1, wherein said starch derivative comprises at least one of α -cyclodextrin, β -cyclodextrin, γ -cyclodextrin, maltodextrin; the nano regulating material comprises at least one of nano calcium carbonate, nano silicon dioxide, nano titanium dioxide and nano ferric oxide.
7. The hydration heat regulating type calcium-magnesium composite expanding agent for concrete according to claim 1, wherein the porous carbon material is prepared by the following steps: mixing and soaking rice hulls with an ammonium chloride solution, and then filtering, drying and calcining to obtain the porous carbon material.
8. The water-based thermal regulation type calcium-magnesium composite expanding agent for concrete according to claim 7, wherein in the preparation process of the porous carbon material, the concentration of the ammonium chloride solution is 0.5-2 mol/L, and the mass ratio of the rice husk to the ammonium chloride solution is 1: (5-20); the soaking temperature is room temperature, and the soaking time is more than 12 hours; the calcination temperature is 400-600 ℃, and the calcination time is 30-60 min.
9. The hydration heat regulation type calcium-magnesium composite expanding agent for concrete according to claim 1, wherein the slump retention time of the slump retention superplasticizer is more than or equal to 2h, and the water reduction rate is more than or equal to 20%.
10. A method for preparing the hydration heat regulation type calcium-magnesium composite expanding agent according to any one of claims 1 to 9, comprising the steps of: and uniformly mixing the magnesium expansion component, the calcium expansion component, the hydration heat regulating component, the humidity control component and the plasticizing component to obtain the hydration heat regulating type calcium-magnesium composite expansion agent.
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| CN117361929B (en) * | 2023-12-08 | 2024-02-09 | 内蒙古工业大学 | Micro-expansion capsule of carbide slag/white mud coated modified high-temperature wax and preparation method thereof |
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