关于高性能混凝土工作性评价方法的研究

杨静; 覃维祖; 吕剑锋

doi:10.13204/j.gyjz199804002

关于高性能混凝土工作性评价方法的研究

doi: 10.13204/j.gyjz199804002

基金项目:

国家重点基础研究发展计划资助项目(2004CB619106)

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- 文章访问数: 75
- HTML全文浏览量: 13
- PDF下载量: 95
- 被引次数: 0
出版历程
- 收稿日期: 2009-12-24
- 修回日期: 2009-12-24
- 刊出日期: 1998-04-20

Funds:

Supported by National Basic Research Program of China (No.2004CB619106)

摘要

摘要: 高性能混凝土在新拌状态下不仅流动性大，且具有较高的塑性粘度，因此用传统的坍落度方法难以全面地反映其工作性。作者设计了一种较为科学并有效地评价高性能混凝土工作性的方法，采用Ｌ型流动仪，以大量不同配比的高性能混凝土为对象进行了试验研究，检验了该方法的有效性、科学性与重复性。

Abstract: Objective To summarize the clinical features and analyze the serologic test results of latent syphilis. Methods The clinical data of 601 patients with latent syphilis who were treated in the sexually transmitted disease centre of Peking Union Medical College Hospital between January 2001 and November 2007 were retrospectively analyzed. Results Of the 601 cases of latent syphilis,there were 174 cases of early latent syphilis(EL),170 cases of late latent syphilis(LL),and 257 cases of unknown latent syphilis. Male to female ratio was 0.74:1（256 males and 345 females,respectively). Patients aged 20-39 years accounted for the largest proportion. Non-marital sexual intercourse was the main route of infection. Forty-six patients (7.65%) were co-infected with other sexually transmitted diseases. A total of 251 cases of latent syphilis (41.76%) were confirmed when the patients were receiving tests for other sexually transmitted diseases or suspected sexually transmitted diseases. Of the 601 patients with EL,LL and unknown latency,the proportion of serum rapid plasma reagin(RPR) titers higher than or equal to 8 were 72.99% (127/174),52.94% (90/170),and 60.31%(155/257),respectively. Compared with the early syphilis,serological negative conversion rate was significantly lower after treatment for l2 months in the early latent syphilis patients (P=0.044). Conclusion Education and awareness raising on syphilis should be strengthened to lower the prevalence of latent syphilis.

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参考文献(12)

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