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首页> 外文期刊>American journal of applied sciences >Mechanical Strength and Durability Properties of High Performance Mortar Containing Densified Silica Fume | Science Publications
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Mechanical Strength and Durability Properties of High Performance Mortar Containing Densified Silica Fume | Science Publications

机译：含致密硅粉的高性能砂浆的机械强度和耐久性能科学出版物

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> Problem statement: Numerous data and information on pozzolanic reaction and microfiller properties of silica fume were derived from laboratory investigation on silica fume in undensified form. Currently, due to low bulk density of undensified silica fume which poses problem in transportation and handling of the material, silica fume are commercially supplied in densified form. Densification process used to increase bulk density of fresh silica fume has resulted in agglomeration of the silica fume particles hence altering its effective particle size and distribution which may affect its hydration and microfiller properties. However, very few studies have been performed to study hydration properties of cementitious mixtures containing Densified Silica Fume (DSF) as supplementary binder. Approach: Characterization of physical and chemical properties of DSF was performed. Compressive strength of high performance mortar mixtures containing DSF as partial cement replacement material at various level of replacement ranging between 0-25% was assessed. Water absorption and intrinsic air permeability of hardened mortars was evaluated at the age of 28 days. Results: Incorporation of DSF at replacement level up to 25% produced mortar with higher 28 days compressive strength as compared to the control mortars. Reduction in 28 day water absorption and intrinsic air permeability of mortar was observed for mortar containing DSF up to 15% by weight of binder. Conclusion: DSF was determined to have large median particle size of 28.21 µm and high amorphous silica content. Incorporation of DSF in mortar increases water demand of mix to achieve constant workability. Optimum level of cement replacement using DSF to ensure best compressive strength performance was found to be 7.5% by total weight of binder.
机译： > 问题陈述：关于硅粉的火山灰反应和微填料性能的大量数据和信息来自于未经致密化形式的硅粉的实验室研究。当前，由于未稠化的硅粉的低堆积密度在材料的运输和处理中造成了问题，因此以浓密的形式商业供应二氧化硅。用于增加新鲜硅粉堆积密度的致密化工艺导致了硅粉颗粒的团聚，因此改变了其有效粒径和分布，这可能影响其水合和微填料性能。但是，很少进行研究来研究含有致密二氧化硅粉尘（DSF）作为辅助粘合剂的胶凝混合物的水合性能。 方法：对DSF的物理和化学性质进行了表征。评估了含有DSF作为部分水泥替代材料的高性能砂浆混合物在0-25％之间的不同替代水平下的抗压强度。在28天的使用期限内评估了硬化砂浆的吸水率和固有透气性。 结果：与替代砂浆相比，以替代水平掺入高达25％的DSF所生产的砂浆具有更高的28天抗压强度。对于含有高达15重量％的粘合剂的DSF的砂浆，观察到砂浆的28天吸水率和固有空气渗透率降低。 结论：经测定，DSF的中值粒径较大，为28.21 µm，非晶态二氧化硅含量较高。将DSF掺入砂浆中会增加混合物的需水量，以实现恒定的可加工性。发现使用DSF来确保最佳抗压强度性能的最佳水泥替代量为粘合剂总重量的7.5％。

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