水泥-大理石粉浆体流变性能与颗粒级配的关联度
发布时间：2018-08-13 10:29
【摘要】：采用Rheolab QC型旋转黏度计测定了水泥-大理石粉浆体不同剪切速率下的剪切应力和塑性黏度;采用Herschel-Bulkley模型对该浆体进行拟合得到其屈服应力、稠度系数和流性指数,并用触变环面积表征其触变性;采用灰色关联理论分析大理石粉颗粒级配对水泥浆体屈服应力、稠度系数、流性指数和触变性的影响.结果表明:随着大理石粉掺量的增大,水泥-大理石粉浆体的流动性逐渐提高,剪切变稀程度和触变性均逐渐降低;0~10μm的大理石粉质量分数与水泥-大理石粉浆体屈服应力、表观黏度和触变性呈正关联,大于10μm的大理石粉质量分数与之呈负关联,其中5~10μm的大理石粉为关键因子;0~10μm的大理石粉质量分数与水泥-大理石粉浆体的流性指数呈负关联,大于10μm的大理石粉质量分数与之呈正关联,其中20~50μm的大理石粉为关键因子.
[Abstract]:The shear stress and plastic viscosity of cement-marble paste at different shear rates were measured by Rheolab QC rotary viscometer, and the yield stress, consistency coefficient and fluidity index were obtained by fitting the slurry with Herschel-Bulkley model. The thixotropy was characterized by thixotropic ring area, and the effects of marble particle gradation on yield stress, consistency coefficient, fluidity index and thixotropy of cement paste were analyzed by grey correlation theory. The results show that the fluidity of cement-marble paste increases with the increase of the amount of marble powder, and the shear thinning degree and thixotropy decrease gradually the mass fraction of marble powder of 10 渭 m and the yield stress of cement marble paste. The apparent viscosity was positively correlated with thixotropy, and the mass fraction of marble powder larger than 10 渭 m was negatively correlated with the mass fraction of marble powder, in which 510 渭 m marble powder was the key factor and 10 渭 m marble powder mass fraction was negatively correlated with the fluidity index of cement marble paste. The mass fraction of marble powder over 10 渭 m is positively correlated with it, in which 20 渭 m marble powder is the key factor.
【作者单位】： 中南大学土木工程学院;中国水利水电第八工程局有限公司科研设计院;
【基金】：国家自然科学基金资助项目(51278497)
【分类号】：TU528
本文编号：2180702
[Abstract]:The shear stress and plastic viscosity of cement-marble paste at different shear rates were measured by Rheolab QC rotary viscometer, and the yield stress, consistency coefficient and fluidity index were obtained by fitting the slurry with Herschel-Bulkley model. The thixotropy was characterized by thixotropic ring area, and the effects of marble particle gradation on yield stress, consistency coefficient, fluidity index and thixotropy of cement paste were analyzed by grey correlation theory. The results show that the fluidity of cement-marble paste increases with the increase of the amount of marble powder, and the shear thinning degree and thixotropy decrease gradually the mass fraction of marble powder of 10 渭 m and the yield stress of cement marble paste. The apparent viscosity was positively correlated with thixotropy, and the mass fraction of marble powder larger than 10 渭 m was negatively correlated with the mass fraction of marble powder, in which 510 渭 m marble powder was the key factor and 10 渭 m marble powder mass fraction was negatively correlated with the fluidity index of cement marble paste. The mass fraction of marble powder over 10 渭 m is positively correlated with it, in which 20 渭 m marble powder is the key factor.
【作者单位】： 中南大学土木工程学院;中国水利水电第八工程局有限公司科研设计院;
【基金】：国家自然科学基金资助项目(51278497)
【分类号】：TU528
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，本文编号：2180702
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