200 MPa级超高性能混凝土胶砂体系结构与性能研究
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摘要
为了进一步提高常规工艺和标准养护条件下混凝土的强度,采用精品胶材+精品骨料+高效减水剂的技术途径,基于最紧密堆积理论及正交设计试验方法开展200 MPa级超高性能混凝土胶砂体系结构与性能研究。结果表明:实验所用水泥、硅灰、微珠及偏高岭土之间相互存在着紧密堆积效应,调整粉体比例可降低胶凝体系的压实体空隙率并改善流动性能;进一步调整配合比中钢纤维掺量、纳米SiO_2掺量以及细骨料品种,可配制出标准养护条件下90 d抗压强度超200 MPa的超高性能混凝土胶砂。
In order to further improve the strength of concrete under conventional and standard curing conditions,the structure and properties of the 200 MPa super high performance concrete mortar was studied based on tightest accumulation theory and orthogonal design test method, which technical approach was made up of three parts: high quality glue,fine aggregate and superplasticizer. The results show that the cement,silica fume,microbeads and metakaolin which used in the paper have a close accumulation of relationships,adjusting the powder proportion can reduce the porosity of the cementing system and improve the flow performance; Further adjust the mix proportion of steel fiber,nano-SiO_2 content and fine aggregate varieties,the 200 MPa super high performance concrete mortar can be prepared under standard curing condition with 90 d.
In order to further improve the strength of concrete under conventional and standard curing conditions,the structure and properties of the 200 MPa super high performance concrete mortar was studied based on tightest accumulation theory and orthogonal design test method, which technical approach was made up of three parts: high quality glue,fine aggregate and superplasticizer. The results show that the cement,silica fume,microbeads and metakaolin which used in the paper have a close accumulation of relationships,adjusting the powder proportion can reduce the porosity of the cementing system and improve the flow performance; Further adjust the mix proportion of steel fiber,nano-SiO_2 content and fine aggregate varieties,the 200 MPa super high performance concrete mortar can be prepared under standard curing condition with 90 d.
引文
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[7]史才军,肖江帆,曹张,等.材料组成对UHPC性能的影响[J].硅酸盐通报,2013,32(6):1005-1011.
[8]吴中伟.混凝土科学技术近期发展方向的探讨[J].硅酸盐学报,1979(3):82-90.
[2]黄继起,黄政宇.超高性能混凝土胶凝材料组成的研究[J].三峡大学学报,2011(3):47-50.
[3]王冲,蒲心诚.超高强混凝土的制备及其强度基础分析[J].材料科学与工程学报,2008(4):516-519.
[4]蒲心诚,王冲,刘芳,等.特超强高性能混凝土的研制与展望[J].混凝土与水泥制品,2008(2):1-5.
[5]Yu A B,Standish N.Porosity calculations of multi-component mixtures of spherical particles[J].Powder Technol.,1987(52):233-240.
[6]沈业青.水泥压实体结构的评价与其硬化体的孔结构及性能[D].南京:南京工业大学,2010.
[7]史才军,肖江帆,曹张,等.材料组成对UHPC性能的影响[J].硅酸盐通报,2013,32(6):1005-1011.
[8]吴中伟.混凝土科学技术近期发展方向的探讨[J].硅酸盐学报,1979(3):82-90.