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何永佳 《武汉理工大学学报(材料科学英文版)》2013,28(3):544-547
Porous haydite used as waste filter medium was prepared by dreging lake sludge to help solve the treatment problem of sludge and realize its reclamation. Several calcination regimes were considered and their effects on the pore structure and the properties such as the strength, the density, the filtering ability and the phosphate absorption ability of the haydite were investigated. For the mixture of 60% lake sludge and 40% fly ash in this experiment, the calcination regime with a pre-calcination period at about 600 °C, a temperature keeping period at 1 200 °C and a moderate cooling rate are recommended to prepare haydite with reasonable pore structure and good performances for its usage as the waste water filter media. 相似文献
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何永佳 《武汉理工大学学报(材料科学英文版)》2011,26(4):770-773
The samples of the C-S-H series were synthesized by hydrothermal reaction of fumed silica, CaO and deionized water at initial
C/S ratios between 1.0–1.7. Phase composition and structural and morphology characteristics of C-S-H samples were analyzed
by XRD, IR and SEM. The experimental results showed that the d-spacing of (002), (110) and (020) decreased, the d-spacing of (200) increased, and the d-spacing of (310) varied randomly, the polymerization of silica tetrahedra of C-S-H decreased, and morphology of C-S-H samples
varied from sheet shapes to long reticular fibers as C/S ratio increased. 相似文献
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羟丙基甲基纤维素对碳纤维分散性的影响 总被引:3,自引:2,他引:3
通过碳纤维在新拌水泥浆体中的变动系数、硬化水泥浆体电阻率和SEM分析测试等综合评价了羟丙基甲基纤维素(HPMC)对碳纤维在水泥浆体中的分散性的影响。试验发现:HPMC能显著改善纤维的分散,掺量在0.2%~0.4%时,分散效果较好。分析认为机理在于其分子结构中的极性羟基基团与碳纤维表面的极性羟基基团或羰基基团以及水分子之间形成氢键,增强了短碳纤维表面的亲水性和浸润性,提高了短碳纤维的分散性;但掺量较大反而由于体系粘聚性增加而影响分散性,且由于引入较多气泡而使电阻率提高。 相似文献
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试论三峡工程永久船闸运行中的补水与“溢”水何永佳,周光奉(武装警察部队水电第三总队,成都,610036)(武装警察部队水电第一总队,湖北宜昌,443113)人们对自然界某一事物的认识,往往都要经过一个从必然王国到自由王国的认识过程。船闸运行工况中的补... 相似文献
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在不改变三峡永久船闸工程建设标准的前提下,把便于永久船闸初、后期运行的着眼点放在水库特征水位上,用非等分水头的运行原理调整各级闸室底板差,在双线第5级闸室泄水廊道结合部下游设型式为反弧门的工作、检修闸阀,以期实现既降低技术(机电、金属结构设备与施工机械性能等)难度,又减少工程量及投资,既节水多发电,又能力求提高船闸通过能力的目标. 相似文献
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