共查询到20条相似文献,搜索用时 609 毫秒
1.
2.
3.
钙矾石一直是水泥化学的研究热点之一,近几年来,延迟性钙矾石形成过程中产生的膨胀得到越来越多的重视。硫铝酸盐水泥水化产物中含有大量的钙矾石,这些钙矾石在高温下的稳定性如何,延迟性钙矾石对硫铝酸盐水泥的耐久性有何影响等一直是人们所关心的问题。本文主要对石膏掺量20%的硫铝酸盐水泥在高温下的行为进行了研究,对其中的AFt和AFm之间的转变进行了探讨。 相似文献
4.
制备并表征了水化硫铝酸盐水泥粉体材料(HCSAP),并结合水化热、化学收缩、XRD、TG、SEM等测试研究了HCSAP对硫铝酸盐水泥自身水化进程的影响.结果表明:在大水灰比条件下,硫铝酸盐水泥完全水化后主要生成钙矾石、水铝黄长石、单硫型水化硫铝酸钙及少量氢氧化铝.在硫铝酸盐水泥中混掺10%HCSAP,该改性浆体后期水化... 相似文献
5.
机制经济玻璃配合料制备的新方法波兰玻璃陶瓷研究院在钠钙玻璃配合料中使用含量高达80%的碎玻璃,并对原料进行相应的加工和混合,经过一年的工业性试验证实,熔融玻璃质量没有下降,玻璃的物理化学性质和制成品的应用技术参数有所提高,成效良好。 相似文献
6.
7.
通过化学分析、X射线分析、扫描电镜和生产试验,研究了用柠檬酸渣(钙泥)代替石膏矿物原料生产的硫铝酸盐水泥特性及对水泥性能的影响。结果表明,甲柠檬酸渣代替天然石膏生产硫铝酸盐水泥对水泥性能无不利影响。 相似文献
8.
玻璃一般是由石英砂、纯碱、长石、石灰石等为主要原料经熔溶成形,冷却,固化而成的非晶体无机材料。按其化学成份分为:硅酸盐玻璃、磷酸盐玻璃、硼酸盐玻璃、铝酸盐玻璃等,最为常用的是硅酸盐玻璃。主要是由硅酸盐矿物、氧化物等经加热、熔融、冷却而形成的一种无定形的固态材料。 相似文献
9.
《混凝土》2018,(10)
通过对比两种养护温度下铝酸盐水泥基砂浆的力学性能、物相分析和微观结构,研究了不同养护温度(20、50℃)对铝酸盐水泥基砂浆性能的影响。结果表明:20℃养护温度下铝酸盐水泥基砂浆性能明显优于50℃。20℃养护温度下,铝酸盐水泥基砂浆中含有较多的钙矾石、铝胶和AFm,其抗压强度随着养护龄期的增长而增加,28 d龄期试件强度较高,最高强度可达89.1 MPa;50℃养护温度下,铝酸盐水泥基砂浆主要含有钙矾石、C_3AH_6、铝胶和C-S-H,其抗压强度普遍偏低,且随着养护龄期的增长,部分7 d龄期试件出现略微强度倒缩,28 d龄期试件强度逐渐增加,最高强度仅达46.2 MPa。 相似文献
10.
95 绿色隐蔽玻璃(CN1176230A) 本发明提供了透光度为60%以下的绿色红外和紫外辐射吸收玻璃。该玻璃制品的组合物采用标准的钠-钙-硅玻璃基础组成和任选的外加的铁、钴、硒和铬以及钛作为红外和紫外辐射吸收物质及着色剂。本发明的玻璃的颜色特征为主波长约为480~565nm、色纯度约为不高于20%。该玻璃组合物根据特定的应用和所需的透光度,可以具有不同 相似文献
11.
Jitka Mohelnikova 《Construction and Building Materials》2009,23(5):1993-1998
Special glass with reflective coatings has found wide applications in architecture. Thin coatings deposited on glass panes modulate the glass optical properties. Some of the coatings operate as a mirror for long-wave infrared radiation of building interiors. The thin films have high transmittance in visible range and very high reflectance in long-wave infrared range. These coatings limit absorption of infrared radiation in the glass. They have low emissivity. It means radiation heat losses of the coated glazing are reduced. The design of coatings for window glazing applications should be based on the study of optical spectral properties of glass and thin film materials. Optical properties of thin films are determined by spectral characteristics as reflectance, transmittance and absorptance for wavelength in a defined spectral range. Visible and long-wave infrared ranges are important for architectural glass. The article presents results of a study focused on the selection of convenient materials for thin reflective films and optimisation of their composition in coatings. Data from spectral measurements of transmittance and reflectance of selected types of architectural glass were compared with spectral characteristics of the designed coated glass simulated and optimised in the computer program FILM*CALC. The experimental vacuum deposition of the designed thin reflective coating on the glass substrate was carried out and spectrally measured. Apart from the spectral measurements the effect of the special glass reflectance was thermally evaluated in a testing box with the temperature sensor. Results from experiments, computer simulations and spectral measurements brought design recommendations for the optimised composition of thin infrared reflective coatings for window glazing applications. 相似文献
12.
多孔陶瓷具有低密度、低导热率、高比表面积和耐腐蚀等优点,广泛应用于生物组织工程、催化剂载体、建筑材料等领域。多孔陶瓷的传统成型技术难以满足对多孔陶瓷个性化、结构复杂化、快速制造化、多级孔的要求。增材制造技术(3D打印)具有设计自由度高、制造周期短、制造成本低等优势,可以无需模具快速制造复杂结构多孔陶瓷零件。本文综述了粉末床熔融、粘结剂喷射、材料挤出工艺应用于多孔陶瓷增材制造的研究现状,重点讨论了制备多级孔陶瓷的最新进展及其在陶瓷催化剂载体领域的应用前景,并对所面临的问题进行总结分析,对发展趋势进行了展望。 相似文献
13.
14.
15.
During the early 1980s macro-defect-free (MDF) cements were developed which had properties complimentary to those of conventional ceramics, plastics and metals. The research completed on MDF cements, and particularly the polyvinyl-alcohol/calcium aluminate cement (PVA/CAC) system has been reviewed and the advantages, limitations and potential applications of MDF cements are outlined. The microstructural features of the PVA–CAC MDF systems and the influence this has on physical properties such as flexural strength and moisture resistance are discussed. Possible solutions to the poor moisture resistance of MDF cements are examined critically and alternatives to PVA–CAC described. The recent development of calcium aluminate phenol resin (CAPR) MDF cements that have particularly promising properties is presented. MDF cement technology has the potential to produce more sustainable materials that can compete with ceramics, plastics and metals in a range of applications and key research issues that need to be addressed if MDF cements are to become commercially viable are highlighted. 相似文献
16.
脆性材料SHPB实验技术的研究 总被引:9,自引:2,他引:9
用SHPB装置研究脆性材料(硬岩、混凝土、高强度砂浆、陶瓷等)及脆性材料组构的非均一材料高应变率下的动力特性。在实验技术方面取得进展,简要研讨了万向头、波形整形器、异形炮弹、软性介质、节理试样与结构性试样等问题。 相似文献
17.
18.
19.