混凝土外加剂原理及应用技术

1、会计学1混凝土外加剂原理及应用技术混凝土外加剂原理及应用技术第1页/共98页Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第2页/共98页Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第3页/共98页Key Laboratory of Advanced Civil Engineering Materials

2、(Tongji University), Ministry of Education第4页/共98页Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第5页/共98页Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education一、外加剂作用原理一、外加剂作用原理第6页/共98页Key Laboratory of Advanc

3、ed Civil Engineering Materials(Tongji University), Ministry of Education一、外加剂作用原理一、外加剂作用原理第7页/共98页Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education一、外加剂作用原理一、外加剂作用原理第8页/共98页 几种类型减水剂的特性减水剂减水剂掺量掺量/%界面张力界面张力/mN.m-1减水率减水率/%纯水纯水/70.2/高浓型高浓型FDN萘系减水萘系减水剂剂0.506

4、8.518聚羧酸系聚羧酸系减水剂减水剂0.2043.026氨基磺酸盐系减水剂氨基磺酸盐系减水剂0.5052.022Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第9页/共98页Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education一、外加剂作用原理一、外加剂作用原理第10页/共98页 掺加减水剂的浆体中絮凝状结构的

5、解体游离水游离水水泥颗粒水泥浆体絮凝状结构的形成Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education一、外加剂作用原理一、外加剂作用原理第11页/共98页凝凝 聚聚凝凝 聚聚分分 散散分分 散散第12页/共98页Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education一、外加剂作用原理一、外加剂作用原理第13页/共98页K

6、ey Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education一、外加剂作用原理一、外加剂作用原理第14页/共98页Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education二、外加剂基本性能二、外加剂基本性能第15页/共98页Key Laboratory of Advanced Civil Engineering Materials(

7、Tongji University), Ministry of Education二、外加剂基本性能二、外加剂基本性能第16页/共98页普通减水剂高效减水剂高性能减水剂Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education二、外加剂基本性能二、外加剂基本性能第17页/共98页Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Educat

8、ion二、外加剂基本性能二、外加剂基本性能第18页/共98页Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education二、外加剂基本性能二、外加剂基本性能第19页/共98页木钙减水剂掺量对混凝土坍落度的影响0246810121416182000.10.20.30.40.51木钙掺量( % C )坍落度( c m )二、外加剂基本性能二、外加剂基本性能Key Laboratory of Advanced Civil Engineering Materials(To

9、ngji University), Ministry of Education第20页/共98页二、外加剂基本性能二、外加剂基本性能Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第21页/共98页 木钙掺量对混凝土含气量的影响0123456700.10.20.30.40.50.60.70.8木钙掺量( % C )含气量( % )第22页/共98页MDF、M F高 效减水剂掺量与混凝土含气量的关系012345600.250.50.751掺量( % C)

10、含气量( % )FDN(机械振捣)FDN(人工捣实)MF第23页/共98页二、外加剂基本性能二、外加剂基本性能Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第24页/共98页木钙掺量对矿渣大坝水泥所配制混凝土的凝结时间的影响( 同水泥用量, 同坍落 度 )010203040506000.20.30.40.5掺量( % C)凝结时间( 小时)初凝终凝二、外加剂基本性能二、外加剂基本性能Key Laboratory of Advanced Civil E

11、ngineering Materials(Tongji University), Ministry of Education第25页/共98页萘系高效减水剂对混凝土凝结时间的影响 (同水泥用量，同坍落度)凝结时间(h:min)减水剂名称及掺量(%C)水灰比坍落度(cm)初凝终凝00.438-128-911-12FDN高效减水剂0.50.368-129-1012-1300.6123.85:559:200.50.5935.06:309:15UNF高效减水剂1.00.5764.55:558:4000.708.56:158:30SN-II高效减水剂1.00.549.06:308:30二、外加剂基本性能

12、二、外加剂基本性能Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第26页/共98页二、外加剂基本性能二、外加剂基本性能Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第27页/共98页二、外加剂基本性能二、外加剂基本性能Key Laboratory of Advanced Civil Engineering

13、Materials(Tongji University), Ministry of Education第28页/共98页第29页/共98页木钙减水剂掺量对混凝土抗压强度的影响0102030405000.10.20.30.40.50.60.70.8木钙掺量( % C )抗压强度( M P a )1d3d7d28d90d第30页/共98页FDN高效减水剂掺量与混凝土抗压强度的关系2025303540455000.250.50.751FDN掺量( % C)抗压强度( M P a )第31页/共98页掺加减水剂对混凝土抗渗性的影响混凝土配合比C:S:G减水剂品种及掺量(%C)W/C坍落度(cm)抗渗等

14、级1:1.92:4.081:1.93:4.10/木钙 0.250.610.482.02.0S10S201:1.48:3.401:1.48:3.40/MF 0.50.500.4089.012.0S10S301:1.68:3.701:1.71:3.88/UNF-2 0.50.5640.5072.03.5S6S20二、外加剂基本性能二、外加剂基本性能Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第32页/共98页第33页/共98页第34页/共98页第35页

15、/共98页第36页/共98页 羟基 28 天抗压强度比,%一等品310875合格品510770备注净浆 W/C=0.40,砂浆 C:S=1:1.5, W/C=0.50第42页/共98页第43页/共98页第44页/共98页 0d 1d 3d 7d 28d龄期抗压强度掺与不掺速凝剂对混凝土强度的影响掺速凝剂基准混凝土第45页/共98页二、外加剂基本性能二、外加剂基本性能Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第46页/共98页二、外加剂基本性能二、

16、外加剂基本性能Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第47页/共98页二、外加剂基本性能二、外加剂基本性能Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第48页/共98页二、外加剂基本性能二、外加剂基本性能Key Laboratory of Advanced Civil Engineering Ma

17、terials(Tongji University), Ministry of Education第49页/共98页二、外加剂基本性能二、外加剂基本性能Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第50页/共98页二、外加剂基本性能二、外加剂基本性能Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第51页/

18、共98页二、外加剂基本性能二、外加剂基本性能Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第52页/共98页0 1 2 3 4 5 6 7 8 90 20 40 60 80 100 120耐久性指数DF(%)含气量(%)非引气混凝土引气混凝土0.30W/C0.60DF(%)=P*N/300 *100%混凝土抗冻性与含气量的关系第53页/共98页二、外加剂基本性能二、外加剂基本性能Key Laboratory of Advanced Civil Eng

19、ineering Materials(Tongji University), Ministry of Education第54页/共98页Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第55页/共98页第56页/共98页第57页/共98页第58页/共98页第59页/共98页 搅拌 水泥(和掺合料) + 减水剂干粉 + 集料 混凝土拌合物 水第60页/共98页第61页/共98页第62页/共98页第63页/共98页第64页/共98页第65页/共98页 搅

20、拌 搅拌水泥(和掺合料) + 集料 拌合物 运输 混凝土拌合物 水 部分减水剂第66页/共98页经过时间经过时间(min)00.3%6030坍落度坍落度(cm)0.3%0.3%0.9%第67页/共98页第68页/共98页第69页/共98页第70页/共98页第71页/共98页第72页/共98页第73页/共98页第74页/共98页Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第75页/共98页Key Laboratory of Advanced Civi

21、l Engineering Materials(Tongji University), Ministry of Education第76页/共98页五、混凝土坍落度损失机理及控制技术五、混凝土坍落度损失机理及控制技术Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第77页/共98页水化产物第78页/共98页水化产物第79页/共98页五、混凝土坍落度损失机理及控制技术五、混凝土坍落度损失机理及控制技术Key Laboratory of Advanced

22、Civil Engineering Materials(Tongji University), Ministry of Education第80页/共98页第81页/共98页第82页/共98页六、混凝土外加剂与水泥六、混凝土外加剂与水泥/掺合料适应性掺合料适应性Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education第83页/共98页水泥厂水泥厂外加剂厂外加剂厂施工单位施工单位混凝土供应混凝土供应商商第84页/共98页混凝土外加剂与水泥适应性的概念混凝土外加剂

23、与水泥适应性的概念 按照混凝土外加剂应用技术规范，将经检验符合按照混凝土外加剂应用技术规范，将经检验符合有关标准的某种外加剂掺加到用按规定可以使用该有关标准的某种外加剂掺加到用按规定可以使用该品种外加剂的水泥所配制的混凝土中，一般产生两品种外加剂的水泥所配制的混凝土中，一般产生两种情况：种情况： 1 1）能够产生应有的效果，就认为该水泥与这种）能够产生应有的效果，就认为该水泥与这种外加剂是适应的；外加剂是适应的； 2 2）如果不能产生应有的效果，则该水泥与这种）如果不能产生应有的效果，则该水泥与这种外加剂之间存在不适应性。外加剂之间存在不适应性。第85页/共98页第86页/共98页第87页/共98页混凝土外加剂技术趋向混凝土外加剂技术趋向 从2008年6月1日起，GB175-2007 通用硅酸盐水泥正式实施水泥企业间的兼并和重组将可能使得不同生产厂的水泥以同一品牌面市 修订的GB8076 混凝土外加剂标准中泵送剂的指标要求可能会拒普通型泵送剂于门外，建议采用“普通减水剂(缓凝型、标准型)