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自密实混凝土在基坑浇筑施工的流动性与填充性试验
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作者 高超 张传瑞 霍金娜 《建筑技术开发》 2025年第9期150-152,共3页
自密实混凝土(SCC)为高性能混凝土,其具有较高的流动性,良好的填充性和抗分离性,在没有外部振捣的情况下,其可自动流动并填充复杂模具。试验结合实际工程案例,对自密实混凝土在复杂建筑基坑施工中流动性与填充性进行了分析,探索其应用... 自密实混凝土(SCC)为高性能混凝土,其具有较高的流动性,良好的填充性和抗分离性,在没有外部振捣的情况下,其可自动流动并填充复杂模具。试验结合实际工程案例,对自密实混凝土在复杂建筑基坑施工中流动性与填充性进行了分析,探索其应用潜力。设计坍落度试验、V形漏斗试验、漏斗充填试验和堆积密实度试验,分析水胶比、粉煤灰比例、骨料级配及减水剂掺量等因素对混凝土性能的影响。试验结果表明,调整上述配合比能够显著改善混凝土的流动性与填充性,其可满足复杂施工环境对混凝土高性能需求,为复杂施工发展奠定了基础。 展开更多
关键词 自密实混凝土 流动性 填充性 基坑建筑施工
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Geranyl phenyl ethers from Illicium micranthum and their anti-HBV activity 被引量:1
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作者 LIU Yu YOU Yun-Xia +6 位作者 RAO Li HE Qian SU Yu FAN Yue LI Yi-Zhou XU You-Kai zhang chuan-rui 《Chinese Journal of Natural Medicines》 SCIE CAS CSCD 2022年第2期139-147,共9页
Fourteen new geranyl phenyl ethers(1–14)along with three known compounds(15–17)were isolated from Illicium micranthum,and their structures were elucidated by comprehensive spectroscopic methods.Illimicranins A–H(1... Fourteen new geranyl phenyl ethers(1–14)along with three known compounds(15–17)were isolated from Illicium micranthum,and their structures were elucidated by comprehensive spectroscopic methods.Illimicranins A–H(1–8)were characterized as geranyl vanillin ethers,while 9 and 10 were dimethyl acetal derivatives.Illimicranins I and J(11 and 12)were rare geranyl isoeugenol ethers.Illimicranins K and L(13 and 14)represented the first example of geranyl guaiacylacetone ether and geranyl zingerone ether,respectively.Compounds 1,2 and 15 exhibited anti-HBV(hepatitis B virus)activity against HBsAg(hepatitis B surface antigen)and HBeAg(hepatitis B e antigen)secretion,and HBV DNA replication. 展开更多
关键词 Illicium micranthum Geranyl phenyl ethers Spectroscopic data Anti-HBV activity
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