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低表面能助剂对外墙乳胶漆耐沾污性的影响及其改性机理 被引量:3
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作者 夏娟 彭家惠 +3 位作者 瞿金东 陈明凤 黄新丽 彭红 《新型建筑材料》 北大核心 2007年第9期65-67,共3页
在涂料配方设计中选择LD超疏水性纳米界面剂、Zonyl氟表面活性剂系列、SILRES BS1306、BYK-Silclean 3700等几种商品化的低表面能助剂,研究其对外墙乳胶涂料耐沾污性的影响。结果表明,添加适量的低表面能助剂能大幅度降低涂膜的表面能... 在涂料配方设计中选择LD超疏水性纳米界面剂、Zonyl氟表面活性剂系列、SILRES BS1306、BYK-Silclean 3700等几种商品化的低表面能助剂,研究其对外墙乳胶涂料耐沾污性的影响。结果表明,添加适量的低表面能助剂能大幅度降低涂膜的表面能和吸水率,从而有效地减弱外墙涂料对灰尘的粘附,提高其抗沾污能力。 展开更多
关键词 乳胶涂料 低表面能助剂 疏水 粘灰性
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BOND PERFORMANCE EXPERIMENT FOR FLY ASH CONCRETE AND STEEL BAR
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作者 王倩 吴瑾 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2012年第3期302-306,共5页
The impact of fly ash content on bond performance of steel bars and their surrounding concrete is studied by means of sticking strain gauges on steel bars. The average bond stress-slip curves, the steel strain-anchor ... The impact of fly ash content on bond performance of steel bars and their surrounding concrete is studied by means of sticking strain gauges on steel bars. The average bond stress-slip curves, the steel strain-anchor location curves, and the bond stress-anchor position curves of the pullout specimens with various fly ash contents are obtained. Results indicate that the bond performance of concrete and steel bars can be improved and the distribution of steel strain along the anchorage length tends to be more uniform by adding fly ash in concrete specimens, and both ultimate bond stress and ultimate slip deformation increase the most when 20% of specimens′ content is fly ash. 展开更多
关键词 fly ash concrete bond performance fly ash content bond stress distribution
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Mobility factors of cracked ore in vibrating-ore draw shafts
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作者 吴爱祥 姜立春 陈嘉生 《Journal of Central South University of Technology》 2005年第1期78-82,共5页
The mobile factors of cracked ore in vibrating-ore draw shafts were analyzed. The results show that the mobile coefficient of cracked ores will be mainly influenced by the combination of ore physical factors if the st... The mobile factors of cracked ore in vibrating-ore draw shafts were analyzed. The results show that the mobile coefficient of cracked ores will be mainly influenced by the combination of ore physical factors if the structure dimension and parameters of vibrating ore-draw shafts are sure. It decreases with increasing the cohesion, lump content, lump size and powder content and increases with increasing the porosity. The coefficient decreases with increasing the moisture content, but increases after the moisture content reaches a certain value. Uniform grain leads to better mobility, non-uniform grain leads to worse mobility. The value of the mobile coefficient should be in a range of 0.3-1.1 when designing the vibrating ore-draw shafts. According to correlation degree of grey system (theory,) the effects of factors on the mobility of cracked ore are given in the weight decreasing consequence as follows: moisture content, lump content, distribution of grain size, lump size, porosity, cohesion and powder ore content. It is unreasonable to neglect any one because the values of their weights are not obvious. 展开更多
关键词 vibrating ore-draw SHAFT mobile coefficient gray system theory COHESIVENESS
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Effects of Limestone Powder on Rheological Properties of Cement - Fly Ash Mortar
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作者 XIE Youjun CHEN Xiaobo +2 位作者 MA Kunlin FENG Jin ZHAN Fang 《International English Education Research》 2015年第12期4-8,共5页
This article studies the effects of limestone powder on rheological properties of cement - fly ash mortar with RHEOLAB QC type rotation viscometer. The Bingham fluid model is introduced to fit the yielding stress and ... This article studies the effects of limestone powder on rheological properties of cement - fly ash mortar with RHEOLAB QC type rotation viscometer. The Bingham fluid model is introduced to fit the yielding stress and plastic viscosity of the mortar. The POWER LAW fluid model is introduced to fit the rheological index of the mortar. The results show that, adding limestone powder and fly ash to the cement mortar significantly decreases the yield stress of the mortar, changes the plastic viscosity of the mortar, increases the rheological index, decreases the degree of shear thinning of the mortar, and thereby improves the mortar' s workability. In the case of cement - fly ash mortar, with the increase of limestone powder content, both the yield stress and plastic viscosity of the mortar increase. When the limestone powder content is not higher than 14%, the increase of yield stress is not significant. When the limestone powder content is lower than 8%, the increase of plastic viscosity is not significant. When the content of limestone powder is higher than 22%, the rheological index of the mortar decreases and the degree of shear thinning increases. The effects of limestone powder' s packing density, shape and size, specific surface area, and fluid volume, are found to be the four major factors responsible for the changes ofrheological properties of the mortar. 展开更多
关键词 cement mortar rheological properties limestone powder fly ash MECHANISM
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