简介:摘要高性能混凝土是一种新型高技术混凝土,大都是通过降低水胶比、掺加矿物掺合料来提高混凝土中水泥石的密实度,改善混凝土界面薄弱区结构形态,从而达到高性能目的。一般来讲,与普通混凝土相比,其早期自收缩、温度收缩、干燥收缩大、弹性模量高、徐变能力小;当混凝土收缩受到约束时,会引发很大的自应力。所以,高性能混凝土有着比普通混凝土更大的开裂趋势。本文分析了高性能混凝土原料和配备的抗裂性,介绍了高性能混凝土自收缩、内部湿度的理论研究现状,同时提出了相应的发展方向。
简介: 【摘要】 目的 探讨分析中药炮制对药物性能功效及理化性质的影响效果。方法 66例同一种疾病使用中药治疗患者, 根据使用的药物是否进行了炮制将其分为对照组和观察组, 每组 33例。对照组患者采用未进行炮制的中药, 观察组患者采用进行了炮制的中药。比较两组患者治疗效果、治疗时间、毒副反应发生情况。结果 观察组患者治疗总有效率为 96.97( 32/33), 高于对照组的 81.82%( 27/33), 差异具有统计学意义( P<0.05)。观察组患者治疗时间为( 5.48±1.36) d, 短于对照组的( 8.15±1.67) d, 差异具有统计学意义( P<0.05)。观察组患者毒副反应发生率为 3.03%( 1/33), 低于对照组的 18.18%( 6/33), 差异具有统计学意义( P<0.05)。结论 中药炮制对药物的药性具有一定的影响, 可以有效提高药效, 从而提高治疗效果, 缩短药物使用时间。其对中药的理化性质也有一定的影响, 可以减少药物对人体的毒副作用, 增加安全性。炮制是中药处理中不可避免的一环, 只有进行了合理炮制的中药才能更好的运用到临床治疗中去。 【关键词】 中药炮制 ;药物性能 ;理化性质 ;影响效果 ;回顾性分析 [Abstract] Objective To explore and analyze the effect of traditional Chinese medicine processing on the performance, efficacy and physical and chemical properties of drugs. Methods 66 patients with the same disease treated with traditional Chinese medicine were divided into control group and observation group, 33 cases in each group. Patients in the control group were treated with traditional Chinese medicine without processing, while patients in the observation group were treated with processed Chinese medicine. The treatment effect, treatment time and side effects were compared between the two groups. Results the total effective rate of the observation group was 96.97 (32 / 33), which was higher than 81.82% (27 / 33) of the control group, the difference was statistically significant (P < 0.05). The treatment time of the observation group was (5.48 ± 1.36) d, which was shorter than (8.15 ± 1.67) d of the control group, and the difference was statistically significant (P < 0.05). The incidence of adverse reactions in the observation group was 3.03% (1 / 33), which was lower than 18.18% (6 / 33) of the control group, and the difference was statistically significant (P < 0.05). Conclusion the processing of traditional Chinese medicine has a certain impact on the drug properties, which can effectively improve the efficacy, so as to improve the treatment effect and shorten the drug use time. It also has a certain impact on the physical and chemical properties of traditional Chinese medicine, which can reduce the side effects of drugs on human body and increase the safety. Processing is an inevitable link in the treatment of traditional Chinese medicine, only a reasonable processing of traditional Chinese medicine can be better used in clinical treatment.
简介:摘要:高性能混凝土的主要特点是高减水剂新拌混凝土的高工作性、活性细掺合料、低水灰比、硬化后细观结构紧凑。因此,特别适用于高层、大跨度等现代建筑工程和桥梁结构。它的广泛应用取得了显著的技术、经济和社会效益。高性能混凝土不仅表现出优异的性能,也暴露出其不足。
简介:摘要:随着城市化进程的加速,建筑物的数量和高度不断增加。火灾是建筑物中最为严重的安全事故之一,长时间高温作用和持续燃烧会导致建筑物的完整性损伤和承载能力下降,可能导致坍塌和二次伤害。因此,利用现代科技来防范、救助、阻止大型火灾的发生,加强灾难发生后的紧急处理方案的研究非常必要。我国在建筑材料高温性能方面的研究起步较晚,但近年来已加大研究扶持力度。本文研究高温对高性能混凝土性能的影响,采用电阻炉加热试件模拟高温下高性能混凝土的动态冲击试验,并对其损伤比进行分析。研究结果表明,随着温度的升高,高性能混凝土的损伤比逐渐增加,且不同强度等级的高性能混凝土在高温下的表现也存在差异。