超细石灰石粉对高强高性能混凝土粘性的影响研究.docxVIP

超细石灰石粉对高强高性能混凝土粘性的影响研究吴珍 1寇应霞 1程芸芸 2霍剑 1别明娟 1（1.中电投工程研究检测评定中心，北京 100840；2.北京市建设工程质量第一检测所有限责任公司，北京 100039）【 摘 要 】采用了测量新拌混凝土稠度试验方法，研究了掺加不同量的超细石灰石粉替代同等量粉煤灰的高强高性能混凝土在满足强度的情况下，试件粘性变化的性能。以新拌混凝土的坍落度和倒坍落度的数据作为评价指标，分析了超细石灰石粉对混凝土粘性性能的影响。从实验中可知，未掺加超细石灰石粉的混凝土的倒坍落度几乎都在 20 几秒，当超细石灰石粉掺加量 为 60～100kg/m3 时，倒坍落度的时间明显减少。最明显的是水胶比是 0.27 时，掺加 80kg/m3 超细石灰石粉的混凝土倒坍落度是10s，比未掺加超细石灰石粉的混凝土小 15s。通过本次试验，确定了超细石灰石粉、粉煤灰以及减水剂在高强高性能混凝土中 的最佳掺量，并且得出掺加超细石灰石粉后的混凝土粘性明显降低的结论。【 关 键 词 】 超细石灰石粉；高强高性能混凝土；粘性；强度【 文 章 编 号 】 1671－3702（2012）s2－0035－03【 中 图 分 类 号 】 TU528【 文 献 标 识 码 】 AStudy on Effects of Superfine Limestone Power on the High Strengthand High Performance ConcreteWU Zhen1KOUYing-xia1CHENG Yun-yun2HUO Jian1BIE Ming-juan1(1.C+E Center for Engineering Research Test, Beijing 100840, China;2.Construction Project Quality First Testing Institute Of Beijing 100039 ,China)Abstract: Through consistency test of fresh concrete,the paper discussed the change of viscosity under the equal-substitution of super -fine limestone powder for fly ash in super high strength concrete. Taking the slump constant of fresh concrete as evaluation indexs, the effect of super -fine limestone powder on lond letween reinforcement andconcrete is analysed.Based on the esperiment results, without addition of super-fine limestone, the value of concrete slump is about 20seconds, when the addition is between 60and100kg/m3, the value of concrete slump decrease paaarently .Most obviously, when water to binder ratio is 0.27, the slump of concrete with 80kg/m3 super-fine limestone powder is 10s, 15second smaller than concrete without super-fine limestone powder. Through the experiment, the optimum mix amout has been found out, the paper draws a conclusion that the super -fine limestone powder can reduce the viscosity of concrete effectively.Keywords: Superfine lime stone powder; Excel in high performance concretes; Viscosity; Intensity; durability占60 % ，针片状物 质含量小 于 5 % 。豆石粒 径 为 5 ～12mm。水符合 JGJ63 混凝土拌和用水的技术要求。减 水剂：高性能标准型减水剂：