Influence of Silica Fume on High-Calcium Fly Ash Expansion during Hydration

The purpose of this work was to study the possibility of neutralizing high-calcium fly ash expansion during hydration. The object of the study was the fly ash of Berezovskaya GRES, which is capable of independent setting and hardening. The test in the Le Chatelier molds showed that the divergence of indicator arms was 90–100 mm 1 day after mixing with water. The expansion and cracking of the fly ash could be completely prevented by silica fume addition in an amount of 42.9% by weight of the fly ash. At the same time, the compressive strength of specimens from the fly ash–sand paste in a ratio of 1:5 at the age of 28 days was 1.47 MPa. The isothermal heat release at a temperature of 20 °C for 10 days reached 500 kJ/kg. XRF and DTA results showed that free lime in the fly ash was completely hydrated in 11 days and gave the greatest expansion in the absence of silica fume. The presence of silica fume made the lime hydration incomplete and decreased the expansion. Unslaked free lime remained in the system. Exothermic data showed that silica fume inhibited CaO hydration from the reaction start.     

秦皮直肠给药的研究

以血清中秦皮甲素薄层斑点扫描积分值为指标,采用正交设计,找出秦皮直肠给药的最佳条件。再以秦皮口服和直肠给药后生物利用度比较,表明直肠给药更优。应用改良离体外翻肠囊法进行秦皮直肠给药的体外实验,结果与体内实验一致。     

施用磷酸二铵对延胡索产量品质的影响

目的研究施用磷酸二铵对延胡索产量品质的影响。方法设计不同梯度的磷酸二铵用量,在相同种植条件下,观察并记录不同施肥量下延胡索的主要生长指标。采收后按照《中国药典》2015年版要求,测定总灰分、醇溶性浸出物和延胡索乙素含量,并进行分析比较。结果磷酸二铵用量为375 kg/hm~2时延胡索长势最旺,折干率最高,为33.7%,块茎最大,直径为2.57 cm/个,鲜产量最高,为5 482.2 kg/hm~2,比对照增产38.2%,总灰分最低,为3.0%,醇溶性浸出物和延胡索乙素含量最高,分别为24.8%、0.128%。结论施用磷酸二铵能提高延胡索的产量和质量。     

中药材白扁豆质量标准的研究

按2000版《中国药典》相关水分测定法、灰分测定法、浸出物测定法, 对中药材白扁豆的水分、总灰分、酸不溶灰分、水溶性浸出物和醇溶性浸出物等方面的质量问题进行了较为全面和系统的研究, 建立了白扁豆的质量标准体系, 为建立和完善白扁豆的质量标准体系和新版%中国药典&提供了可供参考的数据资料。     

浮小麦中药学研究

目的研究浮小麦的原植物及生态、显微特征及薄层色谱,水分、灰分及浸出物等情况,以完善浮小麦的质量标准。方法对药材进行原植物及生态描述,应用生物显微镜观察药材粉末特征,采用对照药材法考察药材的薄层色谱行为,参照《中国药典》2010年版一部附录考察药材的水分、灰分及浸出物等的情况。结果各地均作为农作物栽培,夏秋季采收。粉末鉴别,主要以淀粉粒为特征重点。薄层鉴别,以对照药材为参考,特征斑点明显,Rf值适宜。增加水分、总灰分及浸出物等的限度范围。结论修订浮小麦的药材质量标准,对于保证其质量和临床疗效具有重要意义。     

Use of Fluidized Bed Combustion Fly Ash as a Partial Substitute for Cement in Underwater Concrete Mixes

Despite limitations to coal combustion energy production, many countries face the still-unresolved problem of utilising the wastes from fluidised bed coal combustion. One direction of rational utilisation can be using these wastes in the building materials industry. The study aimed to analyse the possibility of using fluidised bed combustion fly ashes as a partial substitute for cement in the underwater concrete (UWC). Two groups of concrete mixes were tested, containing 20 to 50% of fluidised bed combustion fly ashes. Investigations of the rheological properties of the concrete mixes and the mechanical performance of the hardened concrete confirmed the possibility of replacing cement in UWC with fluidised bed combustion fly ash up to 30% of the cement mass. The higher content of the fly ashes significantly worsens the UWC strength as well as the consistency and wash-out loss of the concrete mixes, excluding its use in underwater concreting.     

DWL.67×106立式花铁筛打麦机的研制

研制的打麦机,采用无级变速传动、环形中心进料、打板加筋等新结构和筛筒用低碳马氏体热处理新工艺,从而使该机灰分降高,碎麦低,使用寿命长。     

Mechanical Properties and Axial Compression Deformation Property of Steel Fiber Reinforced Self-Compacting Concrete Containing High Level Fly Ash

The cement industry has brought serious environmental pollution problems. In the background of ecological civilization, accelerating rational use of waste resources plays an important role in protecting the environment. In this study, self-compacting concrete (SCC) is prepared using fly ash and lime powder as supplementary cementitious materials by replacing 50%, 60%, and 70% of ordinary Portland cement. By systematically analyzing the influence of the fly ash replacement rate on the workability and mechanical properties of SCC, steel-fiber-reinforced SCC containing 60% fly ash is chosen for further study, and steel fiber is added at the percentages of 0.25%, 0.50%, 0.75%, and 1.00%. The performances in fresh and hardened states are investigated in terms of workability, compressive strength, splitting tensile strength, flexural strength, and axial compression deformation property. The obtained outcomes indicate that although the incorporation of fly ash can improve the workability of the mixture, there is a negative correlation between the mechanical properties of SCC and the fly ash replacement rate. For steel-fiber-reinforced SCC containing 60% fly ash, when the content of steel fibers exceeds 0.75%, the workability decreases sharply, and even when the volume fraction is 1.00%, the passing ability cannot meet the requirements of the technical specifications for applications of self-compacting concrete. The analysis results for mechanical properties show that compressive strength is not changed significantly with increasing percentage of steel fibers. The steel fibers strengthen splitting tensile strength and flexural strength significantly, and compared with that of without steel fibers, they increased by 22% and 58%, respectively, with steel fibers up to 1.00%. Additionally, the parameters of the axial compression deformation property are improved by introducing steel fibers, especially the strain energy (Vε) and relative toughness (Γ) of steel-fiber-reinforced SCC containing a high level of fly ash.     

党参质量评价体系的建立及不同产地党参质量差异性分析

目的 多点采样研究并建立党参质量评价体系,采用其对不同来源的党参进行质量差异性分析。方法 对党参的总灰分、酸不溶灰分、醇溶性浸出物进行测定,采用HPLC-DAD对党参炔苷进行测定并建立HPLC指纹图谱;将指标与指纹图谱结合起来建立党参质量评价体系;用建立的质量评价体系对不同来源的党参样品进行质量评价。结果 不同产地灰分和酸不溶灰分检测结果显示,符合《中国药典》2010年版标准;而不同来源党参炔苷量具有显著性差异;不同产地的党参指纹图谱具有9个共有峰,相关系数均在0.8以上,建立的指纹图谱可用于党参质量评价。结论 本研究用多指标检测结合指纹图谱建立的党参质量评价体系可用于不同来源党参的质量评价及质量控制。