排序方式: 共有38条查询结果,搜索用时 607 毫秒
1.
2.
The hydration performances of slag cement mixed by limestone and anhydritehave been studied. The phase compositions andmicrostructures of the hydrates were determinedand analysed by XRD and SEM. It is discoveredthat when slag cement is mixed with limestoneand anhydrite. the hydrations of the clinker andslag are speeded. The amount of ettringite andhydrate calcium silicate are increased and the me-chanical strength of slag cement are enchanced. 相似文献
3.
In this paper,several dicalciumsilicates(β-C_2S)obtained from impuritieshave been studied.A study of the structureand properties of these doped dicalciumsilicates reveals that the doping with MgO ofBaSO_4 enhanced their activity and rate ofhydration,K_20 has a similar effect roughless pronounced.The lattice distortion and crystal size inβ-dicalcium silicates are measured by X-raypowder diffraction technique,the bindingenergies of 2P~3 for Ca and 2P for Si areobtained by X-ray photoelectric spectrum,thevibrations of the chemical bonds in silicateanion [SiO_4]_(4-) are examined by FT-IR andLaser Raman spectra and the heat evolutionduring hydration reaction for β-dicalciumsilicates are determined by microcalorimetry.From the results of XRD,XPS,FT-IR,Raman and micro-DSC,the relationshipbetween the microstructure and properties ofdoped dicalcium silicates and the mechanismof activation due to impurities are discussed. 相似文献
4.
本文利用X射线衍射技术研究不同掺碳量的硅酸盐水泥石。通过分析水化产物的X射线衍射线形,发现碳对水泥的水化过程有加速作用,并用掺碳量越多,水化加速作用越明显。 相似文献
5.
6.
石膏对掺量矿渣水泥强度的影响 总被引:2,自引:1,他引:2
本文通过大量实验研究了不同种类的石膏对高掺量矿渣水泥力学性能的影响,发现用硬石膏或煅烧硬石膏(指天然硬石膏800℃煅烧以后的无水石膏)代替二水石膏能更好地激发矿渣的活性,提高矿渣水泥的强度。用X射线衍射、扫描电子显微镜和热分析等现代测试手段研究和分析了硬石膏和煅烧硬石膏增强矿渣水泥的机理。指出硬石膏和煅烧硬石膏与矿渣的溶散特点相匹配以致在水化过程中形成结晶度高的钙矾石及类托贝莫来石为主体的显微结构 相似文献
7.
8.
9.
汉唐 《电脑界(电脑高手)》2005,(2):65-65
年末将致,公司里各种大小活动,会议也是接二连三的,当然也是公关部最忙碌的时候。在各种活动、会议中,做记录是一项非常重要的工作。这不,今天又有一个重要的记者招待会,马虎不得哦…… 相似文献
10.
<正>日俄战争中,最著名的战役是旅顺西线制高点"203高地争夺战"。日军为攻占俄军固守的203高地,不断进行近乎自杀式的强攻猛打,最终占领了203高地。这场战役,体现了日本军国主义的穷兵黩武,其代价是一片废墟和10万日军亡灵。203高地争夺战中,日军指挥官使用了一种主要用于刺杀而非劈砍式的军刀——203指挥刀。该刀的历史渊源及形制如何?让我们从日本的"明治维新"说起—— 相似文献