CN105776991B - A kind of ecological nano is modified binder materials and preparation method thereof - Google Patents

A kind of ecological nano is modified binder materials and preparation method thereof Download PDF

Info

Publication number
CN105776991B
CN105776991B CN201510975172.5A CN201510975172A CN105776991B CN 105776991 B CN105776991 B CN 105776991B CN 201510975172 A CN201510975172 A CN 201510975172A CN 105776991 B CN105776991 B CN 105776991B
Authority
CN
China
Prior art keywords
ecological nano
binder materials
nano material
cement
modified
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.)
Active
Application number
CN201510975172.5A
Other languages
Chinese (zh)
Other versions
CN105776991A (en
Inventor
郭丽萍
雷东移
曹园章
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Southeast University
Original Assignee
Southeast University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Southeast University filed Critical Southeast University
Priority to CN201510975172.5A priority Critical patent/CN105776991B/en
Publication of CN105776991A publication Critical patent/CN105776991A/en
Application granted granted Critical
Publication of CN105776991B publication Critical patent/CN105776991B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • C04B28/04—Portland cements
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1055—Coating or impregnating with inorganic materials
    • C04B20/1066—Oxides, Hydroxides
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00008—Obtaining or using nanotechnology related materials
    • 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

Abstract

Binder materials and preparation method thereof is modified the present invention relates to a kind of ecological nano, the ratio of mud is 0.15~0.35, and other components are in terms of weight/mass percentage composition：Cement is 35%~55%, and modified silicon ash is 3%~11%, agstone 10%~20%, and I grades of Class F fly ash of high-quality are 30%~40%, and high efficiency water reducing agent is 0.2%~2%.By carrying out pre-dispersed processing to ecological nano material silicon ash, dispersiveness of the ecological nano material in cement-based material is substantially increased so that micro aggregate effect, filing effect and the volcano ash effect of ecological nano material have obtained more fully playing.The addition of fat lime stone flour further optimizes grain composition, effectively increases the cohesiveness of binder materials mix slurry, improves the compactness of hardened cement, improves the microstructure of binder materials.The addition of flyash simultaneously, improves the mobility and later strength of cement slurry, improves the microstructure of binder materials.

Description

A kind of ecological nano is modified binder materials and preparation method thereof
Technical field
The preparation side of binder materials is modified the present invention relates to building material technical field, more particularly to a kind of ecological nano Method.
Background technology
In the research being modified to cement-based material, mineral admixture or superfine powder with different grain size size Often it is used to optimize the grain composition of cement-based material, most close particle packing is formed to hope, so as to improve hardened cement base The microstructure of material, and then improve physical and mechanical property and durability of cement etc., conventional admixture such as silicon ash, fine coal Ash, ground blast furnace slag, ground steel slag, agstone etc..
Silicon ash is a kind of ecological nano material being referred to as with micro-nano granules, it have good volcano ash effect and Particulate filing effect, can significantly improve the internal pore structure and density of cement-based material, significantly improve its intensity, resist Ooze, the performance such as freeze proof, resist chemical.Why silicon ash has very high mineral active, on the one hand has benefited from silicon ash high SiO2Active component, can be with the Ca (OH) that is produced in cement hydration process2Reaction generation C-S-H gels；On the other hand then benefit In the micro-nano granules that it has, the particle of this size has quantum size effect, skin effect and macroscopic quantum tunneling The nano materials such as effect a series of peculiar excellent physics, chemistry and surface and interface performance, in the use of cement-based material In can obtain extraordinary using effect.But be due to that silicon ash particle is superfine, surface can be very high, exist when in individual particle form When, it can automatically be attracted each other in thermodynamic instability state, between particle close to and be transformed into stable state, this phenomenon pole Easily cause micro-nano granules to be reunited, decline its surface-active, cause many excellent characteristics of micro/nano level silicon ash to completely lose, Practical effect is not good, accordingly, with respect to the reuniting effect how eliminated between silicon ash particle, is always the emphasis and heat of research Point.A kind of new silicon ash disperse modified method is provided for this this research, this method mainly has hydroxyl by silicon ash surface, used Silicon ash is pre-processed containing certain density aqua calcis, its surface elecrtonegativity electropositive is modified as in advance, so The configuration of cement-based material is put into reference to anionic dispersing agents in use, so as to realize more preferable dispersion effect afterwards.
In combination with the granular-grade of varigrained flyash and limestone powder mineral admixture to cement-based material With further being optimized, to form most close particle packing, so as to improve the mobility of cement-based material, improve hardening The performances such as microstructure, physical and mechanical property and the durability of cement-based material.
The content of the invention
Binder materials and preparation method thereof, preparation technology letter are modified it is an object of the invention to provide a kind of ecological nano List, low cost, good fluidity, intensity height, good endurance.
The technical scheme is that：A kind of ecological nano is modified the preparation method of binder materials, and the ratio of mud is 0.15~ 0.35, other components are as follows in terms of weight/mass percentage composition：Cement is 35%~55%, and ecological nano material is 3%~11%, stone Limestone flour 10%~20%, I grades of Class F fly ash of high-quality are 30%~40%, and water reducer is 0.2%~2%；Described ecology Nano material is modified silicon ash, SiO2Content is more than 92%wt；The preparation method of described ecological nano material is：By saturation Ca (OH)21 is pressed with water:3 volume ratio prepares Ca (OH)2The aqueous solution, then by preset blending ratio load weighted silicon ash and will have been configured Ca(OH)2The aqueous solution presses 1:10 mass ratio configuration silicon ash slurry simultaneously stirs, and after being then standing and soak for fully, is taken out Bottle,suction, is placed on electronic scale, when suction filtration to silicon ash and Ca (OH) by filter while suction filtration2The mass ratio of solution is 1:When 1, stop Only suction filtration, obtains ecological nano material.
Cement of the present invention is marked as common 42.5 grades of portland cements.
Ecological nano material of the present invention is commercially available common silicon ash, SiO2Content is more than 92%wt.
The calcium carbonate content of agstone of the present invention is more than 95%wt, 5~20 μm of average grain diameter.
Flyash of the present invention is I grades of Class F fly ash of high-quality F classes, free CaO content<1%.
Water reducer of the present invention is polycarboxylic acid series high efficiency water reducing agent, solid content >=40%, water-reducing rate >=40%.
Ecological nano of the present invention is modified the preparation method of binder materials, comprises the following steps：
(1) ecological nano material modification：By saturation Ca (OH)21 is pressed with water:3 volume ratio prepares Ca (OH)2The aqueous solution, so Afterwards by by the load weighted silicon ash of preset blending ratio and the Ca (OH) configured2The aqueous solution presses 1:10 mass ratio configuration silicon ash slurry is simultaneously Stir, after being then standing and soak for fully, suction filtration is carried out to it, bottle,suction is placed on electronic scale while suction filtration, when taking out Filter to silicon ash and Ca (OH)2The mass ratio of solution is 1:When 1, stop suction filtration, now ecological nano material be modified successfully in case With；
(2) modified successful ecological nano material in step (1) is poured into agitator for cement mortar, by the predetermined ratio of mud Water consumption is added, wherein water consumption includes the water included in the ecological nano material after being modified successfully in step (1), then Add according to the load weighted water reducer of preset blending ratio, stirring, then sequentially add by the load weighted cement of preset blending ratio, lime stone Powder, flyash, stirring, then pour into vibration moulding in mould, 20 DEG C of standard curings are produced for 28 days by the compound stirred Ecological nano is modified binder materials.
Beneficial effect:
(1) by carrying out pre-dispersed processing to ecological nano material silicon ash, ecological nano material is substantially increased in cement Dispersiveness in sill so that micro aggregate effect, filing effect and the volcano ash effect of ecological nano material have obtained more filling The performance divided.(2) addition of fat lime stone flour not only considerably reduces cost, it is often more important that further optimize particle Level is matched somebody with somebody, and is effectively increased the cohesiveness of binder materials mix slurry, is improved the compactness of hardened cement, improves gelling The microstructure of material.(3) flyash is introduced, the cost of binder materials can be reduce further, prior flyash Volcano ash effect can effectively improve later strength, improve the microstructure of binder materials；And due to the " ball of fly ash grain Effect ", can increase substantially the mobility of cement slurry.Comprehensive function, is effectively improved microstructure, the physical force of gel material Learn the performance such as performance and durability.
Brief description of the drawings
Fig. 1 is the surface potential comparison diagram of modified silicon ash and unmodified silicon ash in example 1,
Fig. 2 is the microscopic appearance comparison diagram after modified silicon ash and unmodified silicon ash combination water reducer in example 1,
Fig. 3 is the microscopic appearance pair with corresponding reference of hardening ecological nano modification binder materials in embodiment 1 Than figure.
Embodiment
The present invention is further illustrated below by embodiment.
Fluidity test is pressed《Methods for testing uniformity of concrete admixture》" 13. cement pastes in GBT 8077-2012 Fluidity " is carried out.
Anti- folding, intensity test are pressed《Test method for strength of hydraulic cement mortar (ISO methods)》GB/T 17671-1999 are carried out.
All raw material is commercially available finished product.Described cement is marked as common 42.5 grades of portland cements.Described Ecological nano material is commercially available common silicon ash, SiO2Content is more than 92%wt.The calcium carbonate content of described agstone is more than 95%wt, 5~20 μm of average grain diameter.Described flyash is I grades of Class F fly ash of high-quality F classes, free CaO content<1%.Institute The water reducer stated is polycarboxylic acid series high efficiency water reducing agent, solid content >=40%, water-reducing rate >=40%.
Embodiment 1
A kind of ecological nano is modified binder materials, and by weight, the ratio of mud is 0.15, and other component and quality percentages contain Amount is as follows：Cement is 35%, and ecological nano material is 3%, agstone 20%, and I grades of Class F fly ash of high-quality are 40%, poly- carboxylic Sour high efficiency water reducing agent is 2%.
The surface potential figure of silicon ash particle is as shown in figure 1, picture shows that modified silicon ash particle current potential is converted after before modified Into positive potential；The microscopic appearance comparison diagram of silicon ash particle combination water reducer after before modified is as shown in Fig. 2 picture shows modified The dispersiveness of silicon ash is significantly improved；Harden ecological nano be modified binder materials with the microscopic appearance figure of corresponding reference such as Shown in Fig. 3, the surface that picture display hardening ecological nano is modified silicon ash in binder materials is almost wrapped up by C-S-H gels, and Silicon ash dispersiveness is not only worse in reference hardening sample, and many silicon ash surfaces are still the smooth surface of primary granule.
Embodiment 2
A kind of ecological nano is modified binder materials, and by weight, the ratio of mud is 0.20, and other component and quality percentages contain Amount is as follows：Cement is 38.5%, and ecological nano material is 5%, agstone 17%, and I grades of Class F fly ash of high-quality are 38%, high It is 1.5% to imitate water reducer.
Embodiment 3
A kind of ecological nano is modified binder materials, and by weight, the ratio of mud is 0.25, and other component and quality percentages contain Amount is as follows：Cement is 42%, and ecological nano material is 7%, agstone 15%, and I grades of Class F fly ash of high-quality are 35%, efficiently Water reducer is 1.0%.
Embodiment 4
A kind of ecological nano is modified binder materials, and by weight, the ratio of mud is 0.30, and other component and quality percentages contain Amount is as follows：Cement is 56%, and ecological nano material is 3.5%, agstone 10%, and I grades of Class F fly ash of high-quality are 30%, high It is 0.5% to imitate water reducer.
Embodiment 5
A kind of ecological nano is modified binder materials, and by weight, the ratio of mud is 0.35, and other component and quality percentages contain Amount is as follows：Cement is 36%, and ecological nano material is 3.8%, agstone 20%, and I grades of Class F fly ash of high-quality are 40%, high It is 0.2% to imitate water reducer.
The preparation method of nano modification cement described in embodiment 1- embodiments 5, comprises the following steps：
(1) ecological nano material modification：It is pre-configured with saturation Ca (OH)2Saturated solution, then by saturation Ca (OH)2With water By 1:3 volume ratio prepares Ca (OH)2The aqueous solution, then by by the load weighted silicon ash of preset blending ratio and the Ca (OH) configured2Water Solution presses 1:10 mass ratio configuration silicon ash slurry and with magnetic stirrer with 1000r/min rotating speed stirring 30 minutes, then It is standing and soak for after 24h, suction filtration is carried out to it, bottle,suction is placed on electronic scale while suction filtration, when suction filtration to silicon ash and Ca (OH)2The mass ratio of solution is 1:When 1, stop suction filtration, now ecological nano material is modified successfully with standby.
(2) modified successful ecological nano material in step (1) is poured into agitator for cement mortar, by the predetermined ratio of mud Water consumption is added, wherein water consumption includes the water included in the ecological nano material after being modified successfully in step (1), then Add according to the load weighted water reducer of preset blending ratio, stir slowly 1-2 minutes.Then sequentially add by the load weighted water of preset blending ratio Mud, agstone, flyash, are stirred 1-2 minutes slowly, are stirred soon 2-4 minutes, are then poured into mould the compound stirred and shake Dynamic shaping, 20 DEG C of standard curings produce ecological nano for 28 days and are modified binder materials.
Relevant parameter test result is as shown in table 1.
Table 1
Note：Embodiment reference in table 1 is identical with the match ratio of corresponding embodiment, the difference is that silicon ash therein is The silicon ash of unmodified mistake.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any Those skilled in the art disclosed herein technical scope in, the change that can expect without creative work or Replace, should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be limited with claims Fixed protection domain is defined.

Claims (5)

1. a kind of ecological nano is modified binder materials, it is characterised in that the ratio of mud is 0.15 ~ 0.35, and other components are with quality hundred Divide content meter as follows：Cement is 35% ~ 55%, and ecological nano material is 3% ~ 11%, agstone 10% ~ 20%, I grades of low calcium powder of high-quality Coal ash is 30% ~ 40%, and water reducer is 0.2% ~ 2%；Described ecological nano material is modified silicon ash, SiO2Content is more than 92%wt； The preparation method of described ecological nano material is：By saturation Ca (OH)21 is pressed with water:3 volume ratio prepares Ca (OH)2It is water-soluble Liquid, then by by the load weighted silicon ash of preset blending ratio and the Ca (OH) configured2The aqueous solution presses 1:10 mass ratio configuration silicon ash Slurry simultaneously stirs, after being then standing and soak for fully, carries out suction filtration, bottle,suction is placed on electronic scale while suction filtration, when Suction filtration is to silicon ash and Ca (OH)2The mass ratio of solution is 1:When 1, stop suction filtration, obtain ecological nano material；Described water reducer For polycarboxylic acid series high efficiency water reducing agent, solid content >=40%, water-reducing rate >=40%.
2. ecological nano according to claim 1 is modified binder materials, it is characterised in that：Described cement is marked as general Lead to 42.5 grades of portland cements.
3. ecological nano according to claim 1 is modified binder materials, it is characterised in that：The carbonic acid of described agstone Calcium content is more than 95%wt, 5 ~ 20 μm of average grain diameter.
4. ecological nano according to claim 1 is modified binder materials, it is characterised in that：Described flyash is high-quality F I grades of Class F fly ash of class, free CaO content<1%.
5. one kind prepare as claim 1 ~ 4 it is any described in ecological nano be modified binder materials method, it is characterised in that Comprise the following steps that：
（1）Ecological nano material modification：By saturation Ca (OH)21 is pressed with water:3 volume ratio prepares Ca (OH)2The aqueous solution, then will By the load weighted silicon ash of preset blending ratio and the Ca (OH) configured2The aqueous solution presses 1:10 mass ratio configuration silicon ash slurry is simultaneously stirred Uniformly, after being then standing and soak for fully, suction filtration is carried out, bottle,suction is placed on electronic scale while suction filtration, when suction filtration to silicon ash With Ca (OH)2The mass ratio of solution is 1:When 1, stop suction filtration, now ecological nano material is modified successfully with standby；
（2）By step（1）The middle successful ecological nano material of modification is poured into agitator for cement mortar, is added by the predetermined ratio of mud Water consumption, wherein water consumption include step（1）The water included in ecological nano material after middle modified success, is then added According to the load weighted water reducer of preset blending ratio, stirring, then sequentially add by the load weighted cement of preset blending ratio, agstone, Flyash, stirring, then pours into vibration moulding in mould, 20 DEG C of standard curings produce ecology in 28 days by the compound stirred Nano modification binder materials.
CN201510975172.5A 2015-12-23 2015-12-23 A kind of ecological nano is modified binder materials and preparation method thereof Active CN105776991B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510975172.5A CN105776991B (en) 2015-12-23 2015-12-23 A kind of ecological nano is modified binder materials and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510975172.5A CN105776991B (en) 2015-12-23 2015-12-23 A kind of ecological nano is modified binder materials and preparation method thereof

Publications (2)

Publication Number Publication Date
CN105776991A CN105776991A (en) 2016-07-20
CN105776991B true CN105776991B (en) 2017-09-01

Family

ID=56389981

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510975172.5A Active CN105776991B (en) 2015-12-23 2015-12-23 A kind of ecological nano is modified binder materials and preparation method thereof

Country Status (1)

Country Link
CN (1) CN105776991B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109384433B (en) * 2018-12-04 2021-08-17 湖北工业大学 Cementing material for low-heat-damage concrete member
CN109626939A (en) * 2019-01-15 2019-04-16 北京化工大学 It is a kind of modified to enhance water-fast white lime cementitious material and preparation
CN110642550B (en) * 2019-10-10 2023-06-09 中国铁道科学研究院集团有限公司铁道建筑研究所 Composite microsphere for improving early performance of cement-based material

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102452805A (en) * 2010-10-20 2012-05-16 新疆研科节能科技有限公司 Mineral admixture for high durable concrete
CN103193420A (en) * 2012-01-10 2013-07-10 平湖市法而特建筑保温科技有限公司 Nano-material-containing high-strength high-heat insulation exterior wall inorganic heat-retaining face brick
CN105036659A (en) * 2015-07-31 2015-11-11 武汉理工大学 Nanometer and micrometer modified gel material

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150014026A (en) * 2013-07-26 2015-02-06 동양시멘트 주식회사 Concrete-polymer composite using black polymer dispersion

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102452805A (en) * 2010-10-20 2012-05-16 新疆研科节能科技有限公司 Mineral admixture for high durable concrete
CN103193420A (en) * 2012-01-10 2013-07-10 平湖市法而特建筑保温科技有限公司 Nano-material-containing high-strength high-heat insulation exterior wall inorganic heat-retaining face brick
CN105036659A (en) * 2015-07-31 2015-11-11 武汉理工大学 Nanometer and micrometer modified gel material

Also Published As

Publication number Publication date
CN105776991A (en) 2016-07-20

Similar Documents

Publication Publication Date Title
CN105693164B (en) A kind of amino silane modified ecological nano binder materials and preparation method thereof
CN102976672B (en) Low-carbon high-performance concrete auxiliary cementing material
JP5931317B2 (en) Hydraulic composition and concrete using the hydraulic composition
CN102241495B (en) Ultrafine mixed sand concrete by using additive
CN106587788A (en) Low-cement-content self-compacting concrete and preparation method thereof
CN107265966A (en) One kind prepares bridge self-compaction cracking resistance clear-water concrete using high fine powder content Machine-made Sand
CN107417214B (en) A kind of Tungsten tailing blending concrete and preparation method thereof
CN108424063A (en) A kind of fly ash-based geopolymer high-strength grout and preparation method thereof
CN104671725B (en) A kind of morning strong insulator cement adhesive
CN110040997B (en) Nano-nucleating early strength agent for metakaolin as well as preparation method and application of nano-nucleating early strength agent
CN105776991B (en) A kind of ecological nano is modified binder materials and preparation method thereof
JP4384902B2 (en) Manufacturing method of mortar and concrete
CN107365094A (en) A kind of preparation method of mine filling paste
JP2006045048A (en) Solidified body of steel-making slag and method for producing the same
JP5588613B2 (en) Cement mortar
CN108751865A (en) Body refuse soil regeneration baking-free brick and preparation method thereof more than a kind of
CN105693119B (en) A kind of modified phosphorous slag powder and its preparation method and application
WO2008128287A1 (en) Binding composition
CN114605097B (en) Micro-nano bubble water tailing concrete and preparation method thereof
CN106431047B (en) Polycarboxylate water-reducer thixotropic agent, thixotropic polycarboxylate water-reducer and its application
CN110041025A (en) A kind of ameliorative mass concrete and preparation method thereof
Safi et al. Incorporation mode effect of Nano-silica on the rheological and mechanical properties of cementitious pastes and cement mortars
Li et al. Effect of nanosilica on the fresh properties of cement-based grouting material in the portland-sulphoaluminate composite system
CN111646753A (en) Preparation method of C80 machine-made sand concrete
CN111039622A (en) Rapid-setting self-leveling mortar

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant