基于紧密堆积原理的超高强混凝土配合比设计研究  

Study on the mixture proportion design method based on particle closely packing theory for ultra-high strength concrete theory and its curing regime

作　　者：林琳[1] 王淑萍[1] 李静静 王双 钟静雄 LIN Lin;WANG Shuping;LI Jingjing;WANG Shuang;ZHONG Jingxiong(College of Materials Science and Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400045

出　　处：《混凝土》2023年第3期120-125,共6页Concrete

基　　金：国家重点研发计划项目课题(2017YFB0310003);高性能土木工程材料国家重点实验室开放基金(2019CEM004)。

摘　　要：混凝土材料的颗粒堆积密实度对混凝土工作性及强度有着重要影响。利用Fuller曲线及Dinger-Funk紧密堆积理论对超高强混凝土进行配合比设计,研究了紧密堆积状态下胶凝材料的水化过程,探讨了不同配合比下混凝土的密度、工作性及力学性能。结果表明,采用Fuller曲线进行胶凝材料级配优化设计可以降低硅酸盐水泥用量,所设计的混凝土最佳配合比为:P·O 52.5级水泥用量为360 kg/m3,矿物掺合料用量为240 kg/m3,水胶比0.22,砂率40.2%。混凝土1 d强度可达62.7 MPa,28 d抗压强度可达107.9 MPa,与未筛分骨料的混凝土相比,其28 d强度提高了21.2%。Packing density of raw materials have a major impact on the workability and strength of concrete.It presents the mix design method of ultra-high strength concrete(UHSC)based on closely packing principle,i.e.Fuller-distributed and Dinger-Funk continuous distribution theory.The strength development of concrete with different mixture proportion was investigated.The influence of curing method on ultra-high strength was also discussed.In addition,the microstructure development was also investigated by XRD to explain the development of compressive strength after cured.Experimental results showed that the optimized mix ratio was cement content is 360 kg/m^(3),supplementary cementing materials content is 240 kg/m^(3),water binder ratio is 0.22,sand-aggregate ratio is 40.2%.Compressive strength of concrete under the condition of nature curing in summer and 35℃steam curing developed stably and its 1 d strength was up to 62.7 MPa.28 d strength of the concrete reached 107.9 MPa.

关 键 词：超高强混凝土 密实堆积设计 抗压强度发展 

分 类 号：TU528.062[建筑科学—建筑技术科学]