摘要
采用旋转黏度计和流动度仪分别研究了超细粉煤灰、硅灰、MgO膨胀剂、羟丙基甲基纤维素醚和黄原胶、聚羧酸系减水剂和萘系减水剂对超细水泥流变性能的影响规律。结果表明,W/C=0.6时超细水泥浆体的屈服应力和塑性黏度分别为11.32Pa和15.22×10-2Pa.s,掺加20%超细粉煤灰后屈服应力和塑性黏度分别增大为18.65Pa和23.71×10-2 Pa.s,掺加10%硅灰后增大为47.75 Pa和47.32×10-2 Pa.s;MgO膨胀剂的掺入增大了浆体的屈服力和塑性黏度,活性越高,流变性越差;羟丙基甲基纤维素醚的保水增稠效果优于黄原胶;掺加减水剂降低了浆体的屈服力和塑性黏度,聚羧酸系减水剂的减水效果优于萘系减水剂;通过减水剂和增黏剂的配合使用,可以得到流动性优良且不泌水的浆液。
The influence of super-fine mineral admixtures and chemical admixtures on rheological property of super-fine cement grouts was in- vetigated by coaxial roating cylinder viscometer and fluidity tester.Results shows that the yield stress and plastic viscosity are 11.32 Pa and 15.22× 10-2 Pa· s at the W/C of 0.6,After added 20% fly ash, the yield stress and plastic viscosity are increased to 18.65 Pa and 23.71 ×10-2 Pa· s.After added 10% silica fume, the yield stress and plastic riscosity are increased to 47.75 Pa and 47.32×10-2 Pa· s.The yield stress and plastic viscosity are increased by incorporation of MgO-bearing expansive agent （MEA）, hydroxypropylmethyl cellulos and xanthan gum, and significantly decreased by incorporation ofpoly-carboxylic water-reducer and naphthalene series superplasticizer.
出处
《混凝土》
CAS
CSCD
北大核心
2011年第10期65-68,共4页
Concrete
关键词
超细水泥
流变参数
流动度
矿物掺合料
外加剂
super-fine cement
rheological parameters
fluidity
mine ral admixtures
chemical admixtures
