CN112592088A - Concrete micro-expansion reinforcing agent and preparation method thereof, concrete and application thereof - Google Patents
Concrete micro-expansion reinforcing agent and preparation method thereof, concrete and application thereof Download PDFInfo
- Publication number
- CN112592088A CN112592088A CN202011535231.4A CN202011535231A CN112592088A CN 112592088 A CN112592088 A CN 112592088A CN 202011535231 A CN202011535231 A CN 202011535231A CN 112592088 A CN112592088 A CN 112592088A
- Authority
- CN
- China
- Prior art keywords
- concrete
- reinforcing agent
- micro
- expansion reinforcing
- cement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 182
- 239000012744 reinforcing agent Substances 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000004568 cement Substances 0.000 claims abstract description 53
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 239000013078 crystal Substances 0.000 claims abstract description 16
- 229910052918 calcium silicate Inorganic materials 0.000 claims abstract description 14
- 239000000378 calcium silicate Substances 0.000 claims abstract description 11
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims abstract description 11
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229910052925 anhydrite Inorganic materials 0.000 claims abstract description 6
- 239000004576 sand Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 239000004575 stone Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 6
- 238000003746 solid phase reaction Methods 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 238000006703 hydration reaction Methods 0.000 abstract description 47
- 230000036571 hydration Effects 0.000 abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 29
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 28
- 239000011707 mineral Substances 0.000 abstract description 28
- 230000001737 promoting effect Effects 0.000 abstract description 8
- 238000005336 cracking Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 230000004913 activation Effects 0.000 abstract description 4
- 238000013329 compounding Methods 0.000 abstract description 4
- 239000012779 reinforcing material Substances 0.000 abstract description 4
- 239000003469 silicate cement Substances 0.000 abstract description 4
- 238000005728 strengthening Methods 0.000 abstract description 4
- 235000010755 mineral Nutrition 0.000 description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 14
- 239000003638 chemical reducing agent Substances 0.000 description 13
- 235000012241 calcium silicate Nutrition 0.000 description 12
- 239000003623 enhancer Substances 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 8
- 239000011398 Portland cement Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 239000010881 fly ash Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008961 swelling Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 3
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 3
- -1 portland cement Chemical compound 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 235000019976 tricalcium silicate Nutrition 0.000 description 3
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 239000011376 self-consolidating concrete Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000012496 blank sample Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 235000010338 boric acid Nutrition 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 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
- 238000009614 chemical analysis method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 239000011396 hydraulic cement Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 150000002790 naphthalenes Chemical class 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003334 potential effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000176 sodium gluconate Substances 0.000 description 1
- 235000012207 sodium gluconate Nutrition 0.000 description 1
- 229940005574 sodium gluconate Drugs 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- IIACRCGMVDHOTQ-UHFFFAOYSA-M sulfamate Chemical compound NS([O-])(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-M 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D1/00—Bridges in general
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
Abstract
The invention provides a concrete micro-expansion reinforcing agent and a preparation method thereof, as well as concrete and application thereof, wherein the reinforcing agent comprises the following raw materials in percentage by mass based on the mass of the concrete micro-expansion reinforcing agent: 59.5 to 89.7 percent of quick hardening sulphoaluminate cement, 10 to 40 percent of anhydrite and 0.3 to 0.5 percent of nano calcium silicate hydrate crystal whisker. The concrete micro-expansion reinforcing agent is prepared by taking high-temperature calcined minerals and natural minerals as main components and compounding a silicate cement mineral activation functional component and a hydration promoting component, and is a concrete performance reinforcing material capable of optimizing cement hydration. The concrete has the advantages that the effects of reducing shrinkage, compacting, strengthening, cracking resistance, water resistance and the like are achieved by improving the hydration degree of the cement, adjusting the proportion of the cement hydration product, improving the crystal configuration of the cement hydration product and promoting the redispersion and hydration of the admixture, the compactness, the early strength and the later strength of the concrete can be effectively improved, and the durability of the concrete is obviously improved.
Description
Technical Field
The invention relates to a concrete micro-expansion reinforcing agent, a preparation method thereof, concrete and application thereof.
Background
The concrete material consists of six parts of common cement, mineral admixture, sand, stone, additive and water. The silicate mineral generated after the ordinary cement is hydrated plays a role of a strength framework, so that the proportion of the cement consumption has a close relation with the compression strength and the durability of the concrete. However, in practical applications, concrete presents a series of problems as the proportion of cement in the concrete increases. The problems of cracks, defects and even engineering quality of various degrees appear in mass concrete such as road concrete, dam concrete, marine concrete, tunnel concrete and the like and high-grade concrete such as building structures, bridge structures, special modeling structures and the like, the using effect of actual engineering is seriously influenced, potential safety hazards exist, some serious accidents occur even in actual application, and inestimable loss is caused to the nation and people.
The current technical approaches are divided into the following four categories: (1) the addition of active mineral admixtures (fly ash, mineral powder, volcanic ash and the like) instead of part of cement can reduce partial hydration heat release, but the shrinkage deformation is increased and the early strength is obviously reduced; when the mineral admixture is excessive, the compressive strength is slowly increased, and the 28d grade is insufficient in some cases, so that the problems cannot be fundamentally solved; (2) the addition of excessive retarder can delay the hydration speed of cement and delay the hydration heat release peak, but can not reduce the total heat release amount; meanwhile, the early strength and the later strength of the concrete are influenced; (3) the water-cement ratio can be reduced by adding the excessive water reducing agent, so that the cement consumption is reduced, and the grade of the later-stage concrete is ensured. However, the concrete heat release is more concentrated due to the reduction of the water cement ratio; meanwhile, the viscosity of the concrete is increased, the working performance is deteriorated, and the actual operation on a construction site is not facilitated; (4) the expansion agent is added to compensate shrinkage, so that shrinkage deformation can be reduced to a certain extent, hydration heat release cannot be reduced, and even the hydration heat release can be greatly improved, so that the hydration heat release is more concentrated, and temperature cracks are generated. The four technologies have different defects, and the problems cannot be fundamentally solved.
Therefore, it is highly desirable to provide a substitute for cement, which avoids the problem of temperature cracks caused by the increase of the temperature difference between the center temperature and the surface temperature of the concrete due to the concentration of heat released inside the concrete as the proportion of cement in the concrete increases, and also avoids the problem of shrinkage cracks easily caused by the increase of the shrinkage deformation of the concrete as the proportion of cement in the concrete increases.
Disclosure of Invention
Based on the technical problems in the prior art, the invention provides a concrete micro-expansion reinforcing agent which can be reacted with a cement raw material of concrete by fully activating molecular bonds in a microscopic state, so that the strength of the concrete is greatly increased, the expansion function of the concrete is improved, and the consumption of the cement is reduced.
In a first aspect, the invention provides a concrete micro-expansion reinforcing agent, which comprises the following raw materials in percentage by mass based on the mass of the concrete micro-expansion reinforcing agent: 60 to 90 percent of quick hardening sulphoaluminate cement, 10 to 40 percent of anhydrite and 0.3 to 0.5 percent of nano calcium silicate hydrate crystal whisker.
The nanometer calcium silicate hydrate crystal whisker (C-S-H) can reduce the total hydration heat and nucleation barrier of cement, advance the hydration exothermic peak and improve the early strength; the nano calcium silicate hydrate crystal whisker mainly plays a role of a crystal seed in the cement hydration reaction process; within a certain amount of the nano calcium silicate hydrate crystal whiskers, the cement hydration process accords with crystallization nucleation and crystal growth, so that the structure is more compact, and the later strength is continuously increased. In the crystal-to-gel ratio of the microstructure, the larger the crystal proportion is, the more stable the dimensional deformation is, and the colloid plays an effective filling role.
The concrete micro-expansion reinforcing agent is prepared by taking high-temperature calcined minerals and natural minerals as main components and compounding a silicate cement mineral activation functional component and a hydration promoting component, and is a concrete performance reinforcing material capable of optimizing cement hydration. The concrete has the advantages that the effects of reducing shrinkage, compacting, strengthening, cracking resistance, water resistance and the like are achieved by improving the hydration degree of the cement, adjusting the proportion of the cement hydration product, improving the crystal configuration of the cement hydration product and promoting the redispersion and hydration of the admixture, the compactness, the early strength and the later strength of the concrete can be effectively improved, and the durability of the concrete is obviously improved.
As a specific embodiment of the invention, the concrete micro-expansion reinforcing agent has a specific surface area of not less than 450m2Kg, e.g. 450m2/kg,500m2/kg,550m2/kg,600m2(iii) kg and any combination thereof.
As a specific embodiment of the present invention, the content of the alkali in the concrete micro-expansion reinforcing agent is not more than 0.6% by mass, for example, within the range of 0.1%, 0.3%, 0.6% by mass and any combination thereof, based on the mass of the concrete micro-expansion reinforcing agent.
The alkali content test execution standard GB 175-2007 general Portland Cement (Portland Cement) refers to Na2O+0.658K2Calculated value of O.
More preferably, the concrete micro-expansion reinforcing agent has a chloride ion content of not more than 0.05% by mass, such as within the range of 0.01%, 0.03%, 0.05% and any combination thereof.
The mass percentage content of the chloride ions in the invention is implemented by a standard JC/T420-2006 chemical analysis method of chloride ions in cement raw materials.
In a second aspect, the invention provides a preparation method of the concrete micro-expansion reinforcing agent, which comprises the following steps: and calcining the raw materials until the raw materials are melted to carry out solid-phase reaction, then cooling to obtain particles, and grinding to obtain the concrete micro-expansion reinforcing agent.
As a specific embodiment of the present invention, the temperature of the calcination operation is in the range of 1200 ℃ to 1300 ℃, such as 1200 ℃, 1250 ℃, 1300 ℃ and any combination thereof.
In a third aspect, the present invention provides a concrete comprising the concrete micro-expansion enhancer of the claim.
Preferably, the mass percentage content of the concrete micro-expansion reinforcing agent is 5-12% based on the mass of the concrete.
In general, the constituents of concrete include: examples of the ordinary cement include hydraulic cements mainly composed of calcium silicate, such as portland cement, ordinary portland cement, fly ash cement, slag cement, and pozzolana cement. Mineral admixtures such as fly ash, slag powder, volcanic ash, zeolite powder and the like. Sand materials such as natural sand, river sand, sea sand, machine sand, artificial sand, tailings sand, and the like. Stones such as crushed stone, pebbles, granite, calcium carbonate, basalt, etc. Others include retarders, water reducers, swelling agents, and the like. Retarders such as boric acid, citric acid, tartaric acid, sodium gluconate, sodium tripolyphosphate, and the like. The water reducing agent comprises naphthalene series, melamine, polycarboxylic acid, sulfamate and the like. Examples of the swelling agent include calcium oxide, magnesium oxide, a compound of calcium sulfoaluminate and calcium oxide, alunites, and iron oxide. The above-mentioned raw materials of the present invention may be prepared by themselves or may be commercially available, and the present invention is not particularly limited thereto.
6kg/m of concrete is added3～10kg/m3Can replace 100kg/m of common cement3～218kg/m3The early strength is improved, the later strength is increased, the size deformation is reduced, and the hydration heat release is reduced; on the premise of the same grade of concrete, under the same working state, the cement consumption is greatly reduced, the expansion performance is improved, the shrinkage is compensated, the cracking is controlled, the concrete cost is greatly reduced, the carbon emission of the concrete is reduced, the environmental protection is facilitated, and the strategic significance of green, coordination and sustainable development is realized.
The concrete is added with the concrete micro-expansion reinforcing agent, and the concrete micro-expansion reinforcing agent directly participates in the hydration of the portland cement, after the calcined mineral, the natural mineral and the portland cement are compounded and added with water for reaction, the activating and hydration-promoting components accelerate the hydration reaction of alumina, silicon dioxide and the like in admixtures such as calcium aluminate mineral, fly ash and the like in the portland cement, so that hydrated minerals which enable the concrete to have quick setting, quick hardening, high strength and micro expansion are generated, and the quick setting, quick hardening, high strength, micro expansion and low shrinkage of a composite system are improved; the potential activity of the mixed materials such as the fly ash and the like is fully excited, so that the early and later strength of the concrete is improved; the tiny ettringite hydrated minerals formed by the hydration of calcium sulphoaluminate fill the gel pores of the nano hydrated calcium silicate whiskers (C-S-H), so that the full compaction effect is achieved, and the durability of the concrete is effectively improved. The expansion function of the expansive hydration products such as ettringite, calcium sulfate and the like in the composite system compensates for drying shrinkage, and improves the cracking resistance, the compactness, the frost resistance and the impermeability of the concrete. In the composite system concrete, the cohesiveness of the concrete is increased due to physical and chemical actions, and segregation and bleeding are avoided.
As a specific embodiment of the present invention, the concrete has a gel reduction ratio not less than 5%, for example, within a range of 5%, 7%, 10%, and any combination thereof.
As a particular embodiment of the invention, the gas content of the concrete is not more than 2%, such as within the range of 1%, 2% and any combination thereof.
As a specific embodiment of the present invention, the concrete has a 7-day compressive strength ratio not less than 90%, such as a range of 92%, 95%, and any combination thereof.
The compressive strength ratio is calculated by adopting standard DB 37/T5123 2018 laboratory management Specification of premixed concrete and mortar enterprises, and the formula is as follows: rs＝Rt/R0×100％；
Wherein:
Rs: compressive strength ratio,%;
Rt: the compressive strength of the concrete doped with the additive is MPa;
R0the compression strength of the standard concrete is MPa.
Preferably, the 28-day compressive strength ratio of the concrete is not less than 100%.
And/or the concrete has a 28-day shrinkage ratio of no greater than 100%, such as in the range of 100%, 90%, 80%, and any combination thereof.
The shrinkage ratio is calculated by DB 37/T5123 and 2018 laboratory management Specification of premixed concrete and mortar enterprises, and the formula is as follows: rK＝Kt/Kc×100％；
RK: a ratio of shrinkage ratio%
Kt: the shrinkage of the tested concrete, percent
Kc: reference coagulationShrinkage of soil,%.
As a specific embodiment of the present invention, the concrete includes sand and stone, and the sand has a grain size of not more than 5mm, for example, within a range of 1mm, 2mm, 5mm, and any combination thereof.
As a particular embodiment of the invention, the stone grain size is not less than 5mm, for example in the range of 5mm, 7mm, 10mm and any combination thereof.
In a fourth aspect, the invention provides application of the concrete in building structures, bridge structures and special modeling structures.
The concrete micro-expansion reinforcing agent is prepared by taking high-temperature calcined minerals and natural minerals as main components and compounding a silicate cement mineral activation functional component and a hydration promoting component, and is a concrete performance reinforcing material capable of optimizing cement hydration. The concrete has the advantages that the effects of reducing shrinkage, compacting, strengthening, cracking resistance, water resistance and the like are achieved by improving the hydration degree of the cement, adjusting the proportion of the cement hydration product, improving the crystal configuration of the cement hydration product and promoting the redispersion and hydration of the admixture, the compactness, the early strength and the later strength of the concrete can be effectively improved, and the durability of the concrete is obviously improved.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention in any way.
The homogeneity index of the concrete micro-expansion reinforcing agent of the embodiment of the invention is shown in table 1.
TABLE 1 concrete enhancer homogeneity index
The performance index of the concrete added with the concrete micro-expansion reinforcing agent in the embodiment of the invention is shown in table 2.
The standard of the method adopts GB50119-20123 technical specification for concrete admixture application and GB8076-2008 for concrete admixture.
TABLE 2 concrete performance index requirements after addition of concrete micro-expansion enhancers
The mineral admixtures in the concrete of the following examples used grade S95 slag powder, grade two fly ash. The sand material adopts river sand, the stone material adopts broken stone, the retarder is citric acid, the water reducing agent adopts polycarboxylic acid series water reducing agent (purchased from Xingguang and chemical industry Co., Ltd.), and the expanding agent adopts calcium oxide.
Example C30-1
Example C30-1 presents a concrete micro-expansion enhancer and concrete made therefrom.
The method of preparing the concrete micro-expansion enhancer of example C30-1 includes the steps of: based on the mass of the concrete micro-expansion reinforcing agent, 75% of quick-hardening sulphoaluminate cement, 24.6% of anhydrite and 0.4% of nano calcium silicate hydrate crystal whisker are calcined at 1250 ℃ until being melted to carry out solid phase reaction, and then the mixture is cooled to obtain particles and ground to obtain the concrete micro-expansion reinforcing agent.
The concrete micro-expansion reinforcing agent prepared in example C30-1 was mixed with other raw materials of concrete to obtain concrete, the raw material composition of which is shown in Table 3.
Wherein, the main components of the cement are as follows: c3S (tricalcium silicate), C2S (dicalcium silicate), C3A (tricalcium aluminate), C4AF (tetracalcium aluminoferrite).
Example C30-2
Example C30-2 presents a concrete micro-expansion enhancer and concrete made therefrom.
The method of preparing the concrete micro-expansion enhancer of example C30-2 includes the steps of: according to the mass of the concrete micro-expansion reinforcing agent, 85% of quick-hardening sulphoaluminate cement, 14.5% of anhydrite and 0.5% of nano calcium silicate hydrate crystal whisker are calcined at 1300 ℃ until being melted to carry out solid phase reaction, and then the mixture is cooled to obtain particles and ground to obtain the concrete micro-expansion reinforcing agent.
The concrete micro-expansion reinforcing agent prepared in example C30-2 was mixed with other raw materials of concrete to obtain concrete, the raw material composition of which is shown in Table 3.
Wherein, the main components of the cement are as follows: c3S (tricalcium silicate), C2S (dicalcium silicate), C3A (tricalcium aluminate), C4AF (tetracalcium aluminoferrite).
Example C30-3
Example C30-3 presents a concrete micro-expansion enhancer and concrete made therefrom.
The method of preparing the concrete micro-expansion enhancer of example C30-3 includes the steps of: according to the mass of the concrete micro-expansion reinforcing agent, 65% of quick-hardening sulphoaluminate cement, 14.5% of anhydrite and 0.5% of nano calcium silicate hydrate crystal whisker are calcined at 1300 ℃ until being melted to carry out solid phase reaction, and then the mixture is cooled to obtain particles and ground to obtain the concrete micro-expansion reinforcing agent.
The concrete micro-expansion reinforcing agent prepared in example C30-3 was mixed with other raw materials of concrete to obtain concrete, the raw material composition of which is shown in Table 3.
Wherein, the main components of the cement are as follows: c3S (tricalcium silicate), C2S (dicalcium silicate), C3A (tricalcium aluminate), C4AF (tetracalcium aluminoferrite).
The concrete micro-expansion reinforcing agents of examples C40-1 to C60-3 and the preparation method are the same as those of example C30-1, and the concrete formulations prepared therefrom are shown in Table 3.
TABLE 3 concrete raw material ratio (kg/m) of each example3)
The concrete of the above examples was tested as follows, and the results are shown in Table 4.
1. Determining the slump and the expansion degree of the concrete according to the technical specification for self-compacting concrete application (JGJ/T283-2012);
2. measuring the heat release of each cube of concrete according to the construction Standard for Mass concrete GB 50496-2018;
3. detecting the strength of each age according to the concrete strength test evaluation standard GB 50107-2010;
4. according to the technical specification GB50119 of concrete admixture application, the expansion rate of 14d water in water and the expansion rate of 14d air in water are measured.
TABLE 4 test results
As can be seen from table 4, the slump and the spreadability of the concrete measured in "self-compacting concrete application specification" JGJ/T283-2012 can be seen as follows: the concrete added with the mineral admixture and the gel reducing agent is consistent with the blank concrete sample, which shows that the mineral admixture replaces cement and the gel reducing agent is added to have no influence on the concrete slump; the slump and the expansion degree of the concrete added with the gel reducing agent are smaller than those of the blank concrete and the loss of the concrete added with a large amount of retarder; the slump and the expansion of the concrete after the gel reducing agent is added are less than the loss of the blank, and the water consumption is reduced and the loss is too fast after a large amount of water reducing agent is added; after the concrete micro-expansion reinforcing agent is added, the loss of the slump and the expansion degree of the concrete is smaller than that of the blank, and after the expanding agent is added, the hydration reaction is accelerated, and the loss is too fast.
According to the measurement of the heat release amount of each cube of concrete in the 'large-volume concrete construction standard' GB50496-2018, the method can be obtained as follows: the concrete after the concrete micro-expansion reinforcing agent is added has the lowest heat release, and the total hydration heat release amount is also reduced to a great extent after a large amount of mineral admixture is used for replacing cement; after a large amount of retarder is added, although the hydration process is delayed and slowed down, the total hydration heat release amount is not changed; after a large amount of water reducing agent is added, the water consumption is reduced, but the hydration heat release is more concentrated, and the total hydration heat release amount is obviously increased; after the expanding agent is added, the hydration reaction is accelerated, and the total amount of hydration heat release is obviously increased.
According to the concrete strength test evaluation standard GB50107-2010, the strength detection of each age can be obtained as follows: after the concrete micro-expansion reinforcing agent is added, the compressive strength of the concrete is highest at each age. After cement is replaced by a large amount of mineral admixture, the early strength and the later strength of concrete are seriously influenced; after a large amount of retarder is added, the influence on the early strength is very obvious, and the later strength is also reduced; after a large amount of water reducing agent is added, the water consumption is reduced, and the early strength and the later strength are improved to different degrees compared with a blank sample; after the addition of the swelling agent, both the early strength and the late strength were improved to different degrees compared to the blank.
According to the technical specification GB50119 of concrete admixture application, the expansion of 14d water in water is more than or equal to 0.015, and the expansion of 14d water in water to 28 d-0.030 in air can be used for compensating the shrinkage of concrete, so that the volume deformation of the concrete is reduced, and the cracking is reduced. Generally, the concrete is best when the expansion in water is proper, the shrinkage of dry air is zero, and the fall between dry air and water is small. From the above table it follows that: the concrete added with the concrete micro-expansion reinforcing agent completely meets the standard requirements, and the concrete has proper expansion in water and minimum shrinkage after being emptied. After cement is replaced by a large amount of mineral admixture, the expansion is slightly reduced, and the contraction is increased rapidly; after a large amount of retarder is added, the shrinkage and the expansion are increased to a certain degree; after a large amount of water reducing agent is added, the shrinkage and expansion are slightly increased; shrinkage and expansion increase dramatically upon addition of the swelling agent.
The concrete micro-expansion reinforcing agent is prepared by taking high-temperature calcined minerals and natural minerals as main components and compounding a silicate cement mineral activation functional component and a hydration promoting component, and is a concrete performance reinforcing material capable of optimizing cement hydration. The concrete has the advantages that the effects of reducing shrinkage, compacting, strengthening, cracking resistance, water resistance and the like are achieved by improving the hydration degree of the cement, adjusting the proportion of the cement hydration product, improving the crystal configuration of the cement hydration product and promoting the redispersion and hydration of the admixture, the compactness, the early strength and the later strength of the concrete can be effectively improved, and the durability of the concrete is obviously improved.
Any numerical value mentioned in this specification, if there is only a two unit interval between any lowest value and any highest value, includes all values from the lowest value to the highest value incremented by one unit at a time. For example, if it is stated that the amount of a component, or a value of a process variable such as temperature, pressure, time, etc., is 50 to 90, it is meant in this specification that values of 51 to 89, 52 to 88 … …, and 69 to 71, and 70 to 71, etc., are specifically enumerated. For non-integer values, units of 0.1, 0.01, 0.001, or 0.0001 may be considered as appropriate. These are only some specifically named examples. In a similar manner, all possible combinations of numerical values between the lowest value and the highest value enumerated are to be considered to be disclosed in this application.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (10)
1. The concrete micro-expansion reinforcing agent is characterized by comprising the following raw materials in percentage by mass based on the mass of the concrete micro-expansion reinforcing agent: 60 to 90 percent of quick hardening sulphoaluminate cement, 10 to 40 percent of anhydrite and 0.3 to 0.5 percent of nano calcium silicate hydrate crystal whisker.
2. The concrete micro-expansion reinforcing agent according to claim 1, wherein the concrete micro-expansion reinforcing agent has a specific surface area of not less than 450m2/kg。
3. The concrete micro-expansion reinforcing agent according to claim 1 or 2, wherein the mass percentage content of the alkali in the concrete micro-expansion reinforcing agent is not more than 0.6% based on the mass of the concrete micro-expansion reinforcing agent; more preferably, the mass percentage content of the chloride ions in the concrete micro-expansion reinforcing agent is not more than 0.05%.
4. A method for preparing a concrete micro-expansion reinforcing agent according to any one of claims 1 to 3, comprising the steps of: and calcining the raw materials until the raw materials are melted to carry out solid-phase reaction, then cooling to obtain particles, and grinding to obtain the concrete micro-expansion reinforcing agent.
5. The method for preparing a concrete micro-expansion reinforcing agent according to claim 4, wherein the temperature of the calcination operation is 1200 ℃ to 1300 ℃.
6. A concrete comprising the concrete micro-expansion reinforcing agent according to any one of claims 1 to 3; preferably, the mass percentage content of the concrete micro-expansion reinforcing agent is 5-12% based on the mass of the concrete.
7. The concrete according to claim 6, wherein the concrete has a gel reduction rate of not less than 5%; and/or the gas content of the concrete is not more than 2%.
8. The concrete according to claim 6 or 7, wherein the 7-day compressive strength ratio of the concrete is not less than 90%; preferably, the 28-day compressive strength ratio of the concrete is not less than 100%; and/or the 28-day shrinkage ratio of the concrete is not more than 100%.
9. The concrete according to any one of claims 6 to 8, wherein the concrete comprises sand and stone, and the sand has a particle size of not more than 5 mm; and/or the stone grain size is not less than 5 mm.
10. Use of the concrete according to any one of claims 6 to 9 in building structures, bridge structures, specially shaped structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011535231.4A CN112592088A (en) | 2020-12-23 | 2020-12-23 | Concrete micro-expansion reinforcing agent and preparation method thereof, concrete and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011535231.4A CN112592088A (en) | 2020-12-23 | 2020-12-23 | Concrete micro-expansion reinforcing agent and preparation method thereof, concrete and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112592088A true CN112592088A (en) | 2021-04-02 |
Family
ID=75201003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011535231.4A Pending CN112592088A (en) | 2020-12-23 | 2020-12-23 | Concrete micro-expansion reinforcing agent and preparation method thereof, concrete and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112592088A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113582648A (en) * | 2021-07-17 | 2021-11-02 | 北京工业大学 | Regulation and control cementing material for promoting hydration of portland cement |
| CN116655335A (en) * | 2023-07-31 | 2023-08-29 | 中国建筑第六工程局有限公司 | Anti-cracking corrosion-resistant concrete, underground multi-span arch concrete structure and construction method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767970A (en) * | 2010-01-15 | 2010-07-07 | 中国建筑材料科学研究总院 | Auto-waterproof bridging particle |
| KR101203919B1 (en) * | 2012-05-31 | 2012-11-22 | 최종윤 | Rapid hardening concrete composition modified with styrene-propenoate terpolymer latex, repairing method for concrete pavement using the same |
| CN102898050A (en) * | 2012-10-22 | 2013-01-30 | 中国建筑材料科学研究总院 | High-magnesium minimum-inflation low-heat cement and preparation method thereof |
| CN103193449A (en) * | 2013-04-03 | 2013-07-10 | 巴斯夫浩珂矿业化学（中国）有限公司 | Rapid-hardening micro-expansion hole sealing material |
| US20150000568A1 (en) * | 2010-10-25 | 2015-01-01 | Macael, Inc. | Optimization of the properties of aluminous cements using inorganic fillers |
| CN106082892A (en) * | 2016-06-17 | 2016-11-09 | 广州毛勒桥梁附件有限公司 | A kind of slightly expanded concrete, using method and application thereof |
| CN108529947A (en) * | 2017-03-06 | 2018-09-14 | 北京城建银龙混凝土有限公司 | A kind of concrete inhibiting distress in concrete |
| CN111848019A (en) * | 2019-04-29 | 2020-10-30 | 东南大学 | Ultrahigh-lift pumping anti-cracking concrete suitable for cable tower structure and preparation method thereof |
| CN112062494A (en) * | 2020-09-16 | 2020-12-11 | 天津炬实科技发展股份有限公司 | Inorganic mineral reinforcing agent |
-
2020
- 2020-12-23 CN CN202011535231.4A patent/CN112592088A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767970A (en) * | 2010-01-15 | 2010-07-07 | 中国建筑材料科学研究总院 | Auto-waterproof bridging particle |
| US20150000568A1 (en) * | 2010-10-25 | 2015-01-01 | Macael, Inc. | Optimization of the properties of aluminous cements using inorganic fillers |
| KR101203919B1 (en) * | 2012-05-31 | 2012-11-22 | 최종윤 | Rapid hardening concrete composition modified with styrene-propenoate terpolymer latex, repairing method for concrete pavement using the same |
| CN102898050A (en) * | 2012-10-22 | 2013-01-30 | 中国建筑材料科学研究总院 | High-magnesium minimum-inflation low-heat cement and preparation method thereof |
| CN103193449A (en) * | 2013-04-03 | 2013-07-10 | 巴斯夫浩珂矿业化学（中国）有限公司 | Rapid-hardening micro-expansion hole sealing material |
| CN106082892A (en) * | 2016-06-17 | 2016-11-09 | 广州毛勒桥梁附件有限公司 | A kind of slightly expanded concrete, using method and application thereof |
| CN108529947A (en) * | 2017-03-06 | 2018-09-14 | 北京城建银龙混凝土有限公司 | A kind of concrete inhibiting distress in concrete |
| CN111848019A (en) * | 2019-04-29 | 2020-10-30 | 东南大学 | Ultrahigh-lift pumping anti-cracking concrete suitable for cable tower structure and preparation method thereof |
| CN112062494A (en) * | 2020-09-16 | 2020-12-11 | 天津炬实科技发展股份有限公司 | Inorganic mineral reinforcing agent |
Non-Patent Citations (3)
| Title |
|---|
| 李遵云等: ""纳米水化硅酸钙对混凝土耐久性的影响"", 《混凝土》 * |
| 王燕谋: "《中国玻璃纤维增强水泥》", 30 June 2000 * |
| 蔺喜强等: ""原料比率及细度对二组分 CSA 膨胀剂膨胀性能的影响"", 《混凝土》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113582648A (en) * | 2021-07-17 | 2021-11-02 | 北京工业大学 | Regulation and control cementing material for promoting hydration of portland cement |
| CN116655335A (en) * | 2023-07-31 | 2023-08-29 | 中国建筑第六工程局有限公司 | Anti-cracking corrosion-resistant concrete, underground multi-span arch concrete structure and construction method thereof |
| CN116655335B (en) * | 2023-07-31 | 2024-02-02 | 中国建筑第六工程局有限公司 | Anti-cracking corrosion-resistant concrete, underground multi-span arch concrete structure and construction method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhang et al. | Effect of retarders on the early hydration and mechanical properties of reactivated cementitious material | |
| Nath et al. | Effect of GGBFS on setting, workability and early strength properties of fly ash geopolymer concrete cured in ambient condition | |
| Boubekeur et al. | Prediction of the durability performance of ternary cement containing limestone powder and ground granulated blast furnace slag | |
| CN109942235B (en) | Normal-temperature curing geopolymer concrete with high strength and high anti-carbonization performance and preparation method thereof | |
| Mira et al. | Effect of lime putty addition on structural and durability properties of concrete | |
| CN108658485B (en) | Hydraulic cement clinker, preparation method thereof, hydraulic cement and application thereof | |
| US5509962A (en) | Cement containing activated belite | |
| Temiz et al. | Investigation of durability of CEM II BM mortars and concrete with limestone powder, calcite powder and fly ash | |
| CN104529319A (en) | Low-heat micro-expansion composite cement and preparation method thereof | |
| EP2842924A1 (en) | Composite binder comprising calcium sulfoaluminate cement and calcium nitrate or calcium nitrite | |
| Abd Elaty et al. | Performance of Portland cement mixes containing silica fume and mixed with lime-water | |
| CN112592088A (en) | Concrete micro-expansion reinforcing agent and preparation method thereof, concrete and application thereof | |
| Sinha et al. | Enhancement of the properties of silicate activated ultrafine-slag based geopolymer mortar using retarder | |
| Ting et al. | Preparation of foamed phosphogypsum lightweight materials by incorporating cementitious additives | |
| Thomas et al. | Equivalent performance with half the clinker content using PLC and SCM | |
| Mansour | Behavior of self-compacting concrete incorporating calcined pyrophyllite as supplementary cementitious material | |
| CN111268988B (en) | High-water-resistance calcination-free phosphogypsum-based slope building block material and preparation thereof | |
| CN114014568B (en) | Low-alkali cement special for railway and bridge construction and preparation method thereof | |
| Dordi et al. | Microfine gound granulated blast furnace slag for high performance concrete | |
| CN110698088B (en) | Retarded portland cement and preparation method thereof | |
| CN111689702B (en) | Early-strength sulfate-resistant cement | |
| Oleng et al. | Physical and Mechanical Experimental Investigation of Concrete incorporated with Ceramic and Porcelain Clay Tile Powders as Partial Cement Substitutes | |
| JP7461264B2 (en) | Method of manufacturing ready-mixed concrete | |
| CN1312233A (en) | Expansion concrete and low-alkali high-efficiency concrete sweller | |
| JP5383045B2 (en) | Cement composition for grout and grout material using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210402 |