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| 1 | 等强混凝土界面过渡区的纳米压痕表征显示文摘通过背散射电子图像分析结合纳米压痕技术研究了等强混凝土界面过渡区性能.结果表明:矿物掺合料不同程度改善了等强混凝土界面过渡区性能,同时也增加了其非匀质性.双掺偏高岭土和石灰石粉可减小等强混凝土界面过渡区的厚度,明显降低其弹性模量增长幅度,但提高了基体的弹性模量,而粉煤灰仅仅降低了等强混凝土界面过渡区弹性模量的增长幅度. | 何智海 钱春香 张异 赵飞 | 2014 | 建筑材料学报2014,17,6: | 13 |
| 2 | 偏高岭土对活性粉末混凝土力学性能及微观结构的影响显示文摘活性粉末混凝土(RPC)具有优异的力学性能和耐久性能,应用前景广阔。为探讨偏高岭土(MK)对RPC的影响,通过MK火山灰活性指数测试,抗压强度、抗折强度和弹性模量试验,以及X射线衍射分析仪(XRD)、扫描电子显微镜(SEM)、压汞和纳米压痕分析,研究了0%、5%、10%、15%和20%的MK等质量取代胶凝材料对RPC力学性能和微观结构的影响。研究结果表明,MK在水泥水化早期就表现出较高的火山灰活性,其中MK掺量为10%时RPC的28 d抗压强度、抗折强度和弹性模量较基准组分别提高了20.1%、18.0%和11.4%,MK的最佳掺量为10%。微观结构分析显示,MK的掺入降低了RPC基体的孔隙率,并且通过“二次水化”反应生成更多额外的水化硅酸钙(C-S-H)凝胶填充基体的孔隙,改善了RPC的微观结构。纳米压痕试验研究表明,掺入质量分数为10%的MK增加了高密度C-S-H的含量,这可能归因于MK的火山灰活性和微集料填充效应。 | 陈丽 周长顺 蒋晨辉 | 2021 | 硅酸盐通报2021,40,4: | 7 |
| 3 | 含玻璃粉超高性能混凝土力学性能及微观结构研究显示文摘玻璃粉(GP)是一种环保型的固废材料。为了有效节约资源和解决环境污染问题,本文利用GP制备了一种绿色超高性能混凝土(UHPC),研究了GP作为一种矿物掺合料对UHPC力学性能和微观结构的影响。研究结果表明:GP的掺入改善了UHPC的流动性,并且降低了UHPC早期力学性能,但对后期力学性能产生显著的增强作用。当GP掺量为20%(质量分数)时,UHPC试样28 d的抗压强度趋近于基准组,而90 d的抗压强度较基准组提高了13.2%。且UHPC试样(90 d)表现出最低的总孔隙率,与基准组试样相比降低了14.6%。同时高密度水化硅酸钙凝胶的含量增加了20%,从而使UHPC形成更加致密的微观结构。GP具有良好的微集料填充效应和火山灰效应。 | 杨震樱 周长顺 | 2021 | 硅酸盐通报2021,40,12: | 7 |
| 4 | Nanoindentation analysis of TiN,TiAlN,and TiAlSiN coatings prepared by cathode ion plating显示文摘The TiN,TiAlN and TiAlSiN coatings were deposited on H13 hot-worked mold steel by cathodic arc ion plating(CAIP).The morphologies,phase compositions,and nanoindentation parameters,such as creep hardness,elastic modulus and plastic deformation energy of the coatings were analyzed with field emission scanning electron microscopy(FESEM),X-ray diffraction(XRD) and nanoindentation testing,respectively,and the test results were compared with equation describing the indentation model.The results show that the TiN,TiAlN and TiAlSiN coating surfaces were dense and composed of TiN,TiN + TiAlN,TiN + Si3N4 + TiAlN phases,respectively.There was no spalling or cracking on the indentation surface.The creep hardness of the TiN,TiAlN and TiAlSiN coatings was 7.33,13.5,and 15.2 GPa,respectively;the corresponding hardness measured by nanoindentation was 7.09,15.6,and 21.7 GPa,respectively;and the corresponding elastic modulus was 201.93,172.79,and 162.77 GPa,respectively.The contact depth and elastic modulus calculated by the indentation model were close to those of the test results,but the remaining indentation parameters showed discrepancies.The sequence of plastic deformation energy was TiN > TiAlN>TiAlSiN. | KONG DeJun FU GuiZhong | 2015 | Science China(Technological Sciences)2015,58,8: | 5 |
| 5 | 沸石粉对混凝土性能和微纳观结构的影响分析显示文摘研究了不同掺量的沸石粉对混凝土抗压强度和干燥收缩的影响,并采用扫描电镜和纳米压痕仪对混凝土的微纳观结构进行了分析。结果表明:掺入沸石粉降低了混凝土的干燥收缩和早期抗压强度,但提高了混凝土的后期强度,且随着沸石粉掺量的增加而不断增大。在养护后期,沸石粉能明显促进混凝土中高密度C-S-H凝胶的生成,改善了界面结构,提高了混凝土密实度,进而提高了混凝土的后期强度,并降低了其干燥收缩。 | 申子生 | 2021 | 市政技术2021,39,8: | 1 |
| 6 | Nanoindentation Characteristics of Cement Paste and Interfacial Transition Zone in Mortar with Rice Husk Ash显示文摘The nanostructure of cementitious materials has important effects on concrete properties. The effects of rice husk ash(RHA) on cement hydration product phases and interfacial transition zone(ITZ) in mortar were investigated from the nano-scale structure perspective. The experimental results indicate that, with the increase of RHA dosages of samples, the volume fraction of high-density calcium-silicate-hydrate(HD C-S-H) in porosity and hydration product phases increases. The volume fractions of HD C-S-H in C-S-H of samples show an increasing trend with the increase of RHA dosages. RHA decreases the thickness of ITZ and increases the matrix elastic moduli of samples, however, the RHA dosoges hardly affect the thickness and elastic moduli. | 何智海 QIAN Chunxiang 杜时贵 HUANG Man XIA Menglu | 2017 | Journal of Wuhan University of Technology(Materials Science)2017,32,2: | 1 |
| 7 | 偏高岭土和不同纤维复掺对UHPC力学性能的影响显示文摘为了研究偏高岭土(MK)和不同纤维复掺对超高性能混凝土(UHPC)力学性能的影响,采用偏高岭土分别与体积分数为2%的钢纤维(SL)、玻璃纤维(GF)、聚乙烯醇纤维(PVA)、聚丙烯纤维(PP)和玄武岩纤维(CB)复掺到超高性能混凝土中的应用。研究结果表明:当MK和不同纤维复掺时,钢纤维表现出最佳的力学性能,其28 d的抗压强度、抗折强度和弹性模量与不掺纤维、含10%MK试样相比分别提高了28%、14%、17.2%;而其他纤维的掺入均不同程度地降低了UHPC的力学性能,这与纤维和基体之间产生弱界面以及纤维团聚有着密切的关系。同时,根据测试数据建立新的UHPC弹性模量预测模型具有良好的可靠性。 | 成聪 周长顺 蒋晨辉 | 2022 | 混凝土2022,,9: | 0 |