CN115477483B - Carbonized reinforced super sulfate cement and preparation method thereof - Google Patents
Carbonized reinforced super sulfate cement and preparation method thereof Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 30
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000003763 carbonization Methods 0.000 claims abstract description 34
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000412 dendrimer Substances 0.000 claims abstract description 14
- 229920000736 dendritic polymer Polymers 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- 239000010440 gypsum Substances 0.000 claims abstract description 11
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 8
- 239000011707 mineral Substances 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 8
- 239000012190 activator Substances 0.000 claims abstract description 7
- 239000003513 alkali Substances 0.000 claims abstract description 7
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 4
- 238000005728 strengthening Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 19
- 229920000962 poly(amidoamine) Polymers 0.000 claims description 13
- 239000000377 silicon dioxide Substances 0.000 claims description 11
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 239000005457 ice water Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000011541 reaction mixture Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 229920002521 macromolecule Polymers 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 150000004985 diamines Chemical class 0.000 claims 1
- 229910021653 sulphate ion Inorganic materials 0.000 claims 1
- 238000010189 synthetic method Methods 0.000 claims 1
- 230000006866 deterioration Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 3
- 238000012986 modification Methods 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 1
- 235000010755 mineral Nutrition 0.000 description 5
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- -1 gypsum Chemical compound 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000404 calcium aluminium silicate Substances 0.000 description 1
- 235000012215 calcium aluminium silicate Nutrition 0.000 description 1
- WNCYAPRTYDMSFP-UHFFFAOYSA-N calcium aluminosilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O WNCYAPRTYDMSFP-UHFFFAOYSA-N 0.000 description 1
- 229940078583 calcium aluminosilicate Drugs 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005464 sample preparation method Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- XJKVPKYVPCWHFO-UHFFFAOYSA-N silicon;hydrate Chemical compound O.[Si] XJKVPKYVPCWHFO-UHFFFAOYSA-N 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
本发明公开了一种碳化强化超硫酸盐水泥，按质量份由以下成分组成，矿粉60‑85份，石膏10‑35份，碱激发剂0‑10份，纳米二氧化硅0‑5份，减水剂0‑1份，聚酰胺‑胺树枝状大分子0‑1份。同时公开了其制备方法，该方法可以改性超硫酸盐碳化劣化的缺点，通过纳米改性技术实现超硫酸盐水泥的碳化强化。本发明可为超硫酸盐水泥的大规模推广应用提供技术支撑。
The invention discloses a carbonization strengthened super sulfate cement, which is composed of the following components in parts by mass: 60-85 parts of mineral powder, 10-35 parts of gypsum, 0-10 parts of alkali activator, and 0-5 parts of nano silicon dioxide , 0-1 part of water reducer, 0-1 part of polyamide-amine dendrimer. At the same time, the preparation method is disclosed, the method can modify the defect of super sulfate carbonization and deterioration, and realize the carbonization strengthening of super sulfate cement through nano modification technology. The invention can provide technical support for large-scale popularization and application of super sulfate cement.
Description
技术领域technical field
本发明属于水泥制备领域，具体涉及一种碳化强化超硫酸盐水泥及其制备方法。The invention belongs to the field of cement preparation, and in particular relates to a carbonization strengthened super sulfate cement and a preparation method thereof.
背景技术Background technique
超硫酸盐水泥是一种由75%~85%（质量分数，下同）的矿渣、10%~20%的石膏等硫酸盐类及1%~5%的碱性成分（如熟料、氢氧化钙等），共同粉磨或分别粉磨再混合而制得的水硬性胶凝材料。其生产过程可以消纳大量工业废弃物，CO2排放量仅为硅酸盐水泥的10%，降低能耗80%~90%，是一种典型低碳胶凝材料。Super sulfate cement is a kind of slag composed of 75%~85% (mass fraction, the same below), 10%~20% sulfate such as gypsum, and 1%~5% alkaline components (such as clinker, hydrogen Calcium oxide, etc.), co-grinding or separately grinding and mixing hydraulic gelling materials. Its production process can absorb a large amount of industrial waste, its CO2 emission is only 10% of that of Portland cement, and its energy consumption can be reduced by 80% to 90%. It is a typical low-carbon cementitious material.
超硫酸盐水泥的主要水化产物为晶体钙矾石（AFt）和胶体水化硅铝酸钙凝胶（C-A-S-H），其中AFt极易碳化分解，进而导致超硫酸盐水泥的整体结构劣化，出现起砂现象，严重制约超硫酸盐水泥的推广应用。The main hydration products of super sulfate cement are crystalline ettringite (AFt) and colloidal hydrated calcium aluminosilicate gel (C-A-S-H). The phenomenon of sanding seriously restricts the popularization and application of super sulfate cement.
目前，主要通过降低水灰比，掺入碱性物质等。然而，降低水灰比仅可以延缓碳化劣化的过程，AFt的分解和碳化劣化现象仍然无法避免。掺入碱性物质可以在一定程度上增加超硫酸盐体系固化CO2的能力，延缓碳化速度；但是，过量的碱性物质将显著降低超硫酸盐水泥的力学性能。At present, it is mainly through reducing the water-cement ratio and adding alkaline substances. However, reducing the water-cement ratio can only delay the carbonization deterioration process, and the decomposition and carbonization deterioration of AFT are still unavoidable. The addition of alkaline substances can increase the ability of supersulfate system to fix CO2 and delay the carbonation rate to a certain extent; however, excessive alkaline substances will significantly reduce the mechanical properties of supersulfate cement.
发明内容Contents of the invention
为了解决以上背景技术的不足，本发明提供一种碳化强化超硫酸盐水泥及其制备方法，该方法可以改性超硫酸盐碳化劣化的缺点，通过纳米改性技术实现超硫酸盐水泥的碳化强化。本发明可为超硫酸盐水泥的大规模推广应用提供技术支撑。In order to solve the deficiencies of the above background technology, the present invention provides a carbonization strengthened super sulfate cement and its preparation method, which can modify the shortcomings of super sulfate carbonization and deterioration, and realize the carbonization strengthening of super sulfate cement through nano modification technology . The invention can provide technical support for the large-scale popularization and application of super sulfate cement.
为实现上述目的，本发明采用下述技术方案：To achieve the above object, the present invention adopts the following technical solutions:
一种碳化强化超硫酸盐水泥，按质量份由以下成分组成，矿粉60-85份，石膏10-35份，碱激发剂0-10份，纳米二氧化硅0-5份，减水剂0-1份，聚酰胺-胺树枝状大分子0-1份。A carbonization strengthened super sulfate cement, which consists of the following components in parts by mass: 60-85 parts of mineral powder, 10-35 parts of gypsum, 0-10 parts of alkali activator, 0-5 parts of nano silicon dioxide, and water reducer 0-1 part, polyamidoamine dendrimer 0-1 part.
进一步地，一种碳化强化超硫酸盐水泥，按质量份由以下成分组成，矿粉70-80份，石膏15-25份，碱激发剂0-6份，纳米二氧化硅0-3份，减水剂0-0.5份，聚酰胺-胺树枝状大分子0-0.5份。Further, a carbonization strengthened super sulfate cement is composed of the following components in parts by mass, 70-80 parts of mineral powder, 15-25 parts of gypsum, 0-6 parts of alkali activator, 0-3 parts of nano silicon dioxide, 0-0.5 part of water reducer, 0-0.5 part of polyamide-amine dendrimer.
进一步地，聚酰胺-胺树枝状大分子为0.5代树状大分子，其合成方法为：准确称取乙二胺12.0g，在乙二醇中加入40g甲醇，然后在25℃下搅拌10 min；随后在25℃下缓慢滴加丙烯酸甲酯137.60g，滴加完毕后，使混合物在25℃下恒温反应24h；反应混合物在50℃、133.3 Pa的条件下减压蒸馏，得到乙二胺为核0.5 代树枝状大分子0.5-PAMAM。Further, polyamide-amine dendrimers are 0.5 generation dendrimers, and the synthesis method is as follows: accurately weigh 12.0 g of ethylenediamine, add 40 g of methanol to ethylene glycol, and then stir at 25 ° C for 10 min Then slowly add 137.60g of methyl acrylate dropwise at 25°C. After the dropwise addition, the mixture was reacted at a constant temperature at 25°C for 24h; the reaction mixture was distilled under reduced pressure at 50°C and 133.3 Pa to obtain ethylenediamine as Core 0.5 Generation dendrimer 0.5-PAMAM.
上述所述的碳化强化超硫酸盐水泥的制备方法，包括以下步骤：The preparation method of above-mentioned carbonization strengthened super sulfate cement, comprises the following steps:
（1）纳米二氧化硅分散液的制备：使用超声波细胞粉碎机分散纳米二氧化硅，分散过程采用冰水浴降温；(1) Preparation of nano-silica dispersion liquid: use an ultrasonic cell pulverizer to disperse nano-silica, and use an ice-water bath to cool down during the dispersion process;
（2）按配合比设计称量碱激发剂硅酸盐水泥、矿粉、石膏和减水剂、聚酰胺-胺树枝状大分子，并与纳米二氧化硅分散液在净浆搅拌机中充分搅拌，搅拌程序为先慢搅120s，停拌15s，然后快搅120s；搅拌均匀后养护，脱模；(2) Weigh the alkali activator portland cement, mineral powder, gypsum and water reducing agent, polyamide-amine dendrimers according to the design of the mixing ratio, and fully stir them with the nano-silica dispersion in the slurry mixer , the mixing procedure is to stir slowly for 120s, stop stirring for 15s, and then stir quickly for 120s; after stirring evenly, maintain and demould;
（3）当试块养护至28d后，将其转移至碳化箱内碳化。碳化的条件为：温度18-22℃，相对湿度65%-75%，CO2浓度为5%。(3) After the test block is cured for 28 days, it is transferred to the carbonization box for carbonization. The carbonization conditions are: temperature 18-22°C, relative humidity 65%-75%, CO2 concentration 5%.
本发明的有益效果为：The beneficial effects of the present invention are:
本发明提出了一种同时提高超硫酸盐水泥力学性能和抗碳化性能的方法：The present invention proposes a method for simultaneously improving the mechanical properties and anti-carbonation properties of super sulfate cement:
1）降低超硫酸盐水泥中易碳化组分AFt的含量，增加产物中难碳化组分C-A-S-H凝胶的含量，提高抗碳化能力；1) Reduce the content of easy carbonization component AFt in super sulfate cement, increase the content of hard carbonization component C-A-S-H gel in the product, and improve the anti-carbonization ability;
2）改性易碳化组分AFt的微纳结构，提高其抗碳化性能；2) Modify the micro-nano structure of the easily carbonized component AFT to improve its anti-carbonization performance;
3）改性AFt的碳化产物的微结构，使其凝胶化，强化超硫酸盐水泥的整体结构。3) Modify the microstructure of the carbonization product of AFT to make it gel and strengthen the overall structure of super sulfate cement.
附图说明Description of drawings
图1为各组样品的强度发展规律（T3表示碳化3天，T7表示碳化7天）。Figure 1 shows the strength development law of each group of samples (T3 means carbonization for 3 days, T7 means carbonization for 7 days).
具体实施方式Detailed ways
为了使技术领域的人员更好地理解本发明方案，并使本发明的上述目的、特征和优点更加明显易懂，下面结合实施例对本发明作进一步的详细说明。In order to enable those skilled in the art to better understand the solution of the present invention, and to make the above-mentioned purpose, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with examples.
实施例1Example 1
（1）原材料：(1) Raw materials:
石膏（天然石膏、脱硫石膏、磷石膏等）Gypsum (natural gypsum, desulfurized gypsum, phosphogypsum, etc.)
矿粉（S95，S105等）Mineral powder (S95, S105, etc.)
粉煤灰（一级或二级粉煤灰）Fly Ash (Class 1 or Class 2 fly ash)
碱激发剂（通用硅酸盐水泥、熟石灰、生石灰等）Alkali activators (general purpose Portland cement, slaked lime, quicklime, etc.)
纳米二氧化硅（粒径5-100nm，SiO2含量大于99 %，比表面积大于200 m2/g）Nano silica (particle size 5-100nm, SiO 2 content greater than 99%, specific surface area greater than 200 m 2 /g)
减水剂（聚羧酸减水剂、萘系减水剂）Water reducer (polycarboxylate water reducer, naphthalene water reducer)
聚酰胺-胺（PAMAM）树枝状大分子Polyamidoamine (PAMAM) dendrimers
（2）样品制备方法：(2) Sample preparation method:
纳米二氧化硅分散液的制备：使用超声波细胞粉碎机分散纳米二氧化硅，分散过程宜采用冰水浴降温。Preparation of nano-silica dispersion liquid: use an ultrasonic cell pulverizer to disperse nano-silica, and use an ice-water bath to cool down during the dispersion process.
0.5代树状大分子的合成：准确称取乙二胺12.0g（0.20 mol），在乙二醇中加入40g甲醇，然后在25℃下搅拌10 min；随后在25℃下缓慢滴加丙烯酸甲酯137.60g（1.60 mol），滴加完毕后，使混合物在25℃下恒温反应24h。反应混合物在50℃、133.3 Pa的条件下减压蒸馏，得到乙二胺为核0.5 代树枝状大分子0.5-PAMAM。Synthesis of 0.5-generation dendrimers: Accurately weigh 12.0 g (0.20 mol) of ethylenediamine, add 40 g of methanol to ethylene glycol, then stir at 25 °C for 10 min; then slowly add methyl acrylate dropwise at 25 °C 137.60 g (1.60 mol) of the ester, after the dropwise addition was completed, the mixture was reacted at a constant temperature of 25 °C for 24 h. The reaction mixture was distilled under reduced pressure at 50°C and 133.3 Pa to obtain 0.5-PAMAM as the core 0.5-generation dendrimer.
减水剂可以与纳米二氧化硅分散液一起制备，亦可以在搅拌时加入。The water reducer can be prepared together with the nano-silica dispersion, or it can be added during stirring.
按配合比设计称量普通硅酸盐水泥（42.5）、矿粉、石膏和减水剂、0.5-PAMAM树枝状大分子，并与纳米二氧化硅分散液在净浆搅拌机中充分搅拌，搅拌程序为先慢搅120s，停拌15s，然后快搅120s。搅拌均匀后装入40mm×40mm×40mm的模具中，振实后转移至养护箱内（20±3℃，RH≥95%）养护，并于1d后脱模，当样品养护至一定龄期后，根据《水泥胶砂强度检验方法》（GB/T 17671-2021）测试试样的抗压强度。Weigh ordinary Portland cement (42.5), mineral powder, gypsum and water reducer, 0.5-PAMAM dendritic macromolecule according to the design of the mix ratio, and fully stir it with the nano-silica dispersion in the slurry mixer. The mixing procedure Stir slowly for 120s first, stop stirring for 15s, then stir quickly for 120s. After stirring evenly, put it into a mold of 40mm×40mm×40mm, vibrate it and transfer it to a curing box (20±3°C, RH≥95%) for curing, and demould after 1 day, when the sample is cured to a certain age , according to the "cement mortar strength test method" (GB/T 17671-2021) to test the compressive strength of the sample.
当试块养护至28d后，将其转移至碳化箱内，在温度18-22℃，相对湿度65%-75%，CO2浓度为5%的环境下进行碳化，碳化一定龄期时，根据《水泥胶砂强度检验方法》（GB/T17671-2021）测试试样的抗压强度。After the test block has been cured for 28 days, it is transferred to the carbonization box and carbonized at a temperature of 18-22°C, a relative humidity of 65%-75%, and a CO2 concentration of 5%. "Cement Mortar Strength Test Method" (GB/T17671-2021) tests the compressive strength of the sample.
由附图1可知，未掺入纳米二氧化硅和0.5-PAMAM树状大分子的常规超硫酸盐水泥碳化后，强度快速降低。单掺纳米二氧化硅（对比组1、2）可以显著提升超硫水泥的28天抗压强度，同时抗压强度随掺入纳米二氧化硅的量成正比，在掺入3%的纳米二氧化硅的情况下最佳（对比组2）。而且纳米二氧化硅改性超硫水泥碳化后，强度不降低反升，抗碳化性能提升显著。同时掺入纳米二氧化硅和0.5-PAMAM树状大分子（对比组3、4、5）将略微降低纳米二氧化硅改性超硫酸盐水泥的力学性能，但是可以显著提高碳化后的力学性能。其力学性能在掺入的0.5-PAMAM树状大分子的量为0.3%时达到最佳（对比组4）。As can be seen from accompanying drawing 1, after the carbonization of the conventional super sulfate cement not mixed with nano-silica and 0.5-PAMAM dendrimers, the strength decreases rapidly. Single doping of nano-silica (comparison group 1 and 2) can significantly improve the 28-day compressive strength of supersulfur cement, and the compressive strength is proportional to the amount of nano-silica mixed in. Best in the case of silicon oxide (comparison group 2). Moreover, after carbonization of nano-silica modified supersulfur cement, the strength does not decrease but increases, and the anti-carbonation performance is significantly improved. Simultaneous incorporation of nano-silica and 0.5-PAMAM dendrimers (comparison groups 3, 4, 5) will slightly reduce the mechanical properties of nano-silica modified super sulfate cement, but can significantly improve the mechanical properties after carbonization . Its mechanical properties reached the best when the amount of 0.5-PAMAM dendrimer incorporated was 0.3% (comparison group 4).
由此可知，纳米二氧化硅可以显著提升其力学性能，其主要作用是提升超硫酸盐水泥石中C-A-S-H凝胶的含量，进而提升力学和抗碳化性能；而0.5-PAMAM树状大分子的主要作用是使碳化产物凝胶化，而非晶体化，从而达到碳化强化的效果。It can be seen that nano-silica can significantly improve its mechanical properties, and its main function is to increase the content of C-A-S-H gel in super sulfate cement stone, thereby improving the mechanical and anti-carbonation properties; while the main function of 0.5-PAMAM dendrimers The function is to make the carbonized product gel rather than crystallize, so as to achieve the effect of carbonization strengthening.
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| JPH03193652A (en) * | 1989-12-21 | 1991-08-23 | Asahi Glass Co Ltd | Hydraulic hardened body |
| CN106007793A (en) * | 2016-05-18 | 2016-10-12 | 武汉理工大学 | Method for improving frost resistance of excess-sulfate phosphogypsum slag cement product |
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| MX2017013820A (en) * | 2017-10-27 | 2019-04-29 | Centro De Investig Y De Estudios Avanzados Del I P N | Cement and supersulfated composites based on volcanic igneous rocks. |
| CN112321182A (en) * | 2020-12-03 | 2021-02-05 | 嘉华特种水泥股份有限公司 | Sulphoaluminate cement, cementing material and slurry for repairing airport runways |
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| JPH03193652A (en) * | 1989-12-21 | 1991-08-23 | Asahi Glass Co Ltd | Hydraulic hardened body |
| CN106007793A (en) * | 2016-05-18 | 2016-10-12 | 武汉理工大学 | Method for improving frost resistance of excess-sulfate phosphogypsum slag cement product |
| MX2017013820A (en) * | 2017-10-27 | 2019-04-29 | Centro De Investig Y De Estudios Avanzados Del I P N | Cement and supersulfated composites based on volcanic igneous rocks. |
| CN107827379A (en) * | 2017-11-28 | 2018-03-23 | 唐山北极熊建材有限公司 | High anti-folding ultra-sulphate cement and preparation method thereof |
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