共查询到16条相似文献,搜索用时 86 毫秒
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<正> 一、前言青铜峡水利枢纽工程是黄河综合利用梯级开发的第一期大型水利工程之一。在施建过程中,曾以甲凝进行基岩裂缝和灌浆廊道排水泵房裂缝的灌浆处理,采用环氧贴橡皮封护裂缝和丙凝灌浆堵水等技术,都取得一定效果。用环氧贴橡皮在水上部位至今完好,但在灌浆廊道中已有多半出现鼓泡脱落,用丙凝灌浆的裂缝也有些部位出现凝胶体 相似文献
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The tracking phenomenon, a carbonaceous process, in epoxy nanocomposite material has been studied under the AC and DC voltage in the present work. It was observed that the tracking is more severe under the DC voltages, especially under positive DC voltage when compared to negative DC voltage. The leakage current during the tracking studies was measured and moving average technique was used to characterize the trend of current flow. It was noticed that an increase in nanoclay content to epoxy resin shows a reduction in magnitude of leakage current flow during tracking test. It was also observed that the magnitude of leakage current is more under negative DC voltage compared with positive DC/AC voltage. The magnitude of leakage current and the tracking time shows inverse relationship as evident from the present study. A drastic reduction in contact angle was observed for the specimens subjected to tracking test. It was confirmed that surface discharges also cause permanent damage to the insulating material. The WAXD studies indicated that up to 5 wt% of nanoclay in epoxy resin resulted in exfoliated structure. The TEM studies were carried out on the nanocomposite structures. The TG-DTA results showed that a maximum degradation of epoxy resin occurs at around 300 °C. From the EPR study it is realized that, in the tracking formed zone the spin concentration is more in epoxy nanocomposites indicating that tracking as a damage generating process. 相似文献
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制备了环氧树脂改性高吸水纤维,随后将改性纤维与天然橡胶通过混、流延、压延、硫化等工艺制备了环境友好型三层复合自修复防水材料,通过SEM、FT-IR、TY-8000万能材料试验机、BTS-001电动不透水仪等考察了自修复防水材料的微观结构、机械性能、抗氧化性能、自修复性能及防渗透性能等。结果表明,高吸水纤维有助于提高其拉伸强度,最大拉伸强度为1.83MPa,断裂伸长率达到700%以上。防水材料完全切断,自修复24h后,其切口部分无可见痕迹,裂口完全愈合,且24h内无水滴渗漏。自修复48h后拉伸强度可达原始材料的2.36倍,断裂伸长率达到80%左右。 相似文献
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Bünyamin Aygün Abdulhalik Karabulut Osman Gencel Abdulkerim Karabulut 《International Journal of Polymer Analysis and Characterization》2015,20(4):323-329
Molybdenum powder was added in an epoxy matrix to increase the neutron-shielding capacity of pure epoxy. FLUKA and GEANT4 Monte Carlo programs were used to design new neutron-shielding material. After finding the epoxy/Mo ratio for the best shielding capacity, neutron equivalent dose rate measurements were performed. Results were compared to commonly used neutron-shielding materials such as paraffin, steel, concrete, and B4C. The produced new sample has a high neutron shielding capacity and it can be used for neutron protection purposes. 相似文献
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选择环氧树脂E51作为改性填料,制备出一系列不同树脂质量分数(0%、2%、4%和6%)的发光树脂透水混凝土。环氧树脂的引入使发光树脂透水混凝土的抗压强度和抗折强度均得到了提高,且随着树脂掺量的增加呈现出先升高后降低的趋势,在树脂质量分数为4%时,抗压强度和抗折强度均达到最大值21.7和6.11 MPa,发光树脂透水混凝土的透水系数随着环氧树脂质量分数的增加呈现出先降低后升高的趋势,在4%时透水系数最低为5.1 mm/s。微观形貌分析发现未经改性的环氧树脂透水混凝土的断面处有明显的裂痕和气孔,整体结构较为疏松,在引入环氧树脂后,裂痕和气孔的数量明显减少,整体结合较为紧密,发光树脂透水混凝土的发光时间与树脂质量分数关系不大,且发光透水混凝土在光照1 h下可以保持超过5 h的较为高效的发光时间。 相似文献
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本文介绍水泥—水玻璃灌浆加固桩基础建筑物的设计,加固方法和原理。对加固的效果作了较为详细的分析。结合中山涤纶厂成品原料仓库和江门市某商品住宅楼两个工程实例,进一步说明水泥—水玻璃灌浆在桩基础建筑物加固的有效性。 相似文献