CN106587796B - 一种解决钢渣粉体安定性不良的方法 - Google Patents
一种解决钢渣粉体安定性不良的方法 Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000843 powder Substances 0.000 title claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 239000006229 carbon black Substances 0.000 claims abstract description 13
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 4
- 239000004568 cement Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 2
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 230000036571 hydration Effects 0.000 abstract 1
- 238000006703 hydration reaction Methods 0.000 abstract 1
- 239000011148 porous material Substances 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 230000002195 synergetic effect Effects 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000004334 sorbic acid Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 230000005074 turgor pressure Effects 0.000 description 1
Classifications
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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
- 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
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
- C04B14/062—Microsilica, e.g. colloïdal silica
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/08—Fats; Fatty oils; Ester type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
一种解决钢渣粉体安定性不良的方法，在向混凝土中添加钢渣时，向所述混凝土中添加引气剂和白炭黑。本发明利用引气剂和纳米SiO2的协同作用在混凝土中引入孔径更小、分布更广的微小气泡为钢渣中的游离CaO、MgO、FeO因水化导致的体积膨胀提供缓冲空间。
Description
技术领域
本发明涉及一种解决钢渣粉体安定性不良的方法，属于新材料技术领域。
背景技术
钢渣是炼钢过程中产生的副产品，高碱度钢渣中含有大量与硅酸盐水泥熟料矿物组成相似的C3S和C2S，因而具有一定的胶凝活性，可当作辅助性胶凝材料应用于水泥和混凝土的生产中。由于高碱度钢渣中含有部分的游离CaO、MgO、FeO等，体积安定性是其应用时必须重点考虑的因素之一。为了缓解钢渣的体积安定性问题，部分钢渣在熔融状态下经过了热焖、热泼、水淬、风淬等工艺，以降低游离CaO、MgO、FeO的含量。除了通过钢渣的预处理外，还可通过粉磨、高温重构、粉磨、与硅质材料混用等方式来缓解高碱度钢渣的安定性问题。
发明内容
本发明目的是提供一种解决钢渣粉体安定性不良的方法。
为达到上述目的，本发明采用的技术方案是：一种解决钢渣粉体安定性不良的方法，在向混凝土中添加钢渣时，向所述混凝土中添加引气剂和白炭黑。
优选的技术方案为：所述钢渣为转炉高碱度钢渣、碱度为3.0~3.5、比表面积为350~400 m2/Kg、游离态CaO含量大于或等于4.25%。
优选的技术方案为：所述白炭黑的粒径为10~50nm、二氧化硅纯度大于或等于99%。
优选的技术方案为：所述引气剂的固含量为20~30%。
优选的技术方案为：所述混凝土使用的水泥为P.O.42.5水泥。
优选的技术方案为：所述引气剂为混凝土中的胶凝材料的质量的万分之0.5至万分之1。
优选的技术方案为：所述白炭黑为混凝土中的胶凝材料的质量的千分之一至千分至三。
由于上述技术方案运用，本发明与现有技术相比具有下列优点和效果：
本发明利用引气剂和纳米SiO2的协同作用在混凝土中引入孔径更小、分布更广的微小气泡为钢渣中的游离CaO、MgO、FeO因水化导致的体积膨胀提供缓冲空间。
具体实施方式
下面结合实施例对本发明作进一步描述：
实施例：一种解决钢渣粉体安定性不良的方法。
一种解决钢渣粉体安定性不良的方法，在向混凝土中添加钢渣时，向所述混凝土中添加引气剂和白炭黑。
所述钢渣为转炉高碱度钢渣、碱度为3.0~3.5、比表面积为350~400 m2/Kg、游离态CaO含量为4.25%。
所述白炭黑的粒径为10~50nm、二氧化硅纯度为99%。
所述引气剂的固含量为25%，具体为竹本油脂AE-200。
所述混凝土使用的水泥为P.O.42.5水泥，其28d强度为49.9MPa，f-CaO（游离态氧化钙）含量0.35%。
所述引气剂为混凝土中的胶凝材料的质量的万分之1。
所述白炭黑为混凝土中的胶凝材料的质量的千分之一。
采用沸煮和压蒸同时进行的方法进行判定安定性是否合格。（参照GB/T1346-2011《水泥标准稠度用水量、凝结时间、安定性检验方法》、GB/T 750-1992《水泥压蒸安定性试验方法》）
表1 f-CaO含量及钢渣粒径与安定性的关系
当钢渣掺量达到30%时，压蒸安定性就表现为不合格，当钢渣掺量达到40%时，沸煮安定性和压蒸安定性均不合格。
表2 引气剂和白炭黑对钢渣粉安定性的缓解作用
实验结果表明，使用引气剂可以有效地缓解f-CaO导致的钢渣安定性不良现象，结合使用白炭黑，可以使引气剂在较低用量的情况下即可达到缓解由于f-CaO导致的钢渣安定性不良现象。且可消除因引气量过多，气孔粒径过大导致的硬化浆体强度下降问题。
引气剂是一种应用于抗冻融混凝土中的外加剂，通过在混凝土拌合物中引入大量微小、封闭而稳定的气泡，为水的液固相变而导致的体积膨胀提供了缓冲空间，可以缓解寒冷地区因为冰涨压力而导致的混凝土破坏。由于引气剂引入的气泡孔径多为微米级或毫米级，当引气量达到一定量后，通常会导致混凝土的力学性能下降，因而在许多规范中对混凝土的含气量做出限定，一般混凝土的含气量不宜高于6%。
白炭黑（纳米SiO2）通过填充作用引气剂引入的气孔的大孔数量（﹥0.1μm）大幅度降低。
上述实施例只为说明本发明的技术构思及特点，其目的在于让熟悉此项技术的人士能够了解本发明的内容并据以实施，并不能以此限制本发明的保护范围。凡根据本发明精神实质所作的等效变化或修饰，都应涵盖在本发明的保护范围之内。
Claims (1)
1.一种解决钢渣粉体安定性不良的方法，其特征在于：在向混凝土中添加钢渣时，向所述混凝土中添加引气剂和白炭黑，所述钢渣为转炉高碱度钢渣，钢渣的添加量为10%或20%，钢渣的碱度为3.0~3.5，钢渣的比表面积为350~400 m2 /Kg，钢渣的游离态CaO含量大于或等于4.25%，所述白炭黑的粒径为10~50nm、二氧化硅纯度大于或等于99%，所述引气剂的固含量为20~30%，所述混凝土使用的水泥为P.O.42.5水泥，所述引气剂为混凝土中的胶凝材料的质量的万分之0.5至万分之1，所述白炭黑为混凝土中的胶凝材料的质量的千分之一至千分至三。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102648167A (zh) * | 2009-11-26 | 2012-08-22 | 建筑研究和技术有限公司 | 用于制造耐化学性建筑化学产品的无机粘合剂体系 |
| CN103539397A (zh) * | 2012-07-12 | 2014-01-29 | 上海城建物资有限公司 | 一种改善孔结构提高强度的复合轻质混凝土及其制备方法 |
| CN105777039A (zh) * | 2016-03-31 | 2016-07-20 | 武汉理工大学 | 一种磷石膏基轻质保温板及其制备方法 |
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| CN102648167A (zh) * | 2009-11-26 | 2012-08-22 | 建筑研究和技术有限公司 | 用于制造耐化学性建筑化学产品的无机粘合剂体系 |
| CN103539397A (zh) * | 2012-07-12 | 2014-01-29 | 上海城建物资有限公司 | 一种改善孔结构提高强度的复合轻质混凝土及其制备方法 |
| CN105777039A (zh) * | 2016-03-31 | 2016-07-20 | 武汉理工大学 | 一种磷石膏基轻质保温板及其制备方法 |
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