共查询到20条相似文献,搜索用时 62 毫秒
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利用燃煤电厂烟气脱硫所产的脱硫石膏制备的β型脱硫建筑石膏,在组分复合改性提高强度和耐水性的基础上,探讨了不同养护制度对脱硫建筑石膏复合改性砌块抗压强度的影响.结果表明:当β型脱硫建筑石膏、生石灰、水泥、粉煤友在58%∶ 14%∶12%∶16%的配合比下,可以使复合改性脱硫石膏基胶凝材料的抗压强度和软化系数明显提高,分别达到18.7MPa和0.7;在湿热养护条件下,养护温度为75℃、养护湿度为95、养护时间为12h的条件下,脱硫石膏复合改性砌块性能表现良好,14d抗压强度达到19.SMPa,可以基本满足建筑墙体材料的要求. 相似文献
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聚丙烯纤维和有机乳液复合改性脱硫建筑石膏 总被引:1,自引:0,他引:1
掺加聚丙烯纤维对脱硫建筑石膏进行物理改性,研究纤维掺量及掺加工艺对脱硫建筑石膏力学性能的影响;掺加有机乳液对脱硫建筑石膏进行化学改性,研究脱硫建筑石膏的耐水性能,并构建乳液防水物理模型;研究聚丙烯纤维和有机乳液对脱硫建筑石膏性能的复合改性效果,利用扫描电镜进行微观形貌分析,对聚丙烯纤维和有机乳液的复合改性作用机理进行讨论.试验表明,经过聚丙烯纤维和有机乳液的复合改性作用,脱硫建筑石膏的性能指标为:抗折强度8.57MPa,抗压强度10.14MPa,24h吸水率6.01%(质量分数). 相似文献
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以陶瓷废料、粉煤灰、石灰、水泥等为原料,采用化学发气方法制备加气混凝土。研究了各原材料组分、工艺参数对加气混凝土浆体流变性能及砌块力学性能的影响,并采用SEM和XRD对其微观形貌进行分析。结果表明,当m(水泥)∶m(石灰)∶m(陶瓷废料)∶m(粉煤灰)∶m(石膏)=20∶17∶39∶21∶3,水料比为0.56,铝粉用量为干基物料的0.1%时,制备的加气混凝土砌块表观密度达到B06等级的要求。经蒸压养护后,形成的主要水化产物有C-S-H(I)凝胶、柳叶状托勃莫来石及少量的水化石榴子石。 相似文献
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以水淬高钛矿渣膨珠为轻骨料,普通硅酸盐水泥为胶凝材料,脱硫石膏为激发剂,采用压制成型工艺制备了轻集料砂浆,研究了高钛矿渣膨珠、水泥、脱硫石膏掺量和对轻集料砂浆力学性能和干密度的影响,利用X射线衍射(XRD)、扫描电镜(SEM)手段对轻质砂浆矿物结构和微观形貌进行了表征。此外,以优选的轻质砂浆为基体,工厂试制了轻质砂浆小型空心砌块。结果表明:轻质砂浆力学性能和干密度随水泥用量增加而升高;随脱硫石膏用量增加,轻集料砂浆抗压强度先增加后降低,干密度变化不大。固定胶凝材料用量18%、脱硫石膏替代水泥20%条件下,所制备轻集料砂浆抗压强度16.0MPa,干密度1789kg/m3,以该轻骨料砂浆为基体材料进行轻集料砂浆小型空心砌块试制,可制备出抗压强度9.6MPa,干密度1223kg/m3,MU7.5的空心砌块。 相似文献
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试验研究耐水型石膏砌块的制备工艺,得到优化配比:脱硫建筑石膏74.9%、KD-3耐水剂25%、缓凝剂0.1%、泡沫0.2m3/m3(泡沫体积/料浆体积),砌块在80℃条件下养护16h,制得砌块的表观密度1087kg/m3、软化系数0.68,符合标准要求。 相似文献
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从生态中求生存--德国盖尔森基辛日光村的启示 总被引:1,自引:0,他引:1
德国的北威州通过“北威州的50个日光村”计划,致力于太阳能利用和低能源消耗的建筑这项激进的革新。作为首批的盖而森基兴——俾斯麦日光村不但表现出能源革新的理念,而且出色地把经济的、社会的、生态的和城市的理念结合在一起。 相似文献
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当前监理企业在迅速发展的同时也潜伏危机,其原因除监理人员的素质外,就是监理企业内部的基础管理问题。本文介绍本公司近几年开展管理活动的具体做法。 相似文献
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There is wide concern in developed countries that groundwater resources are deteriorating in the long-term, both in quantity and quality. Some causes of pollution have a largely agricultural origin of which nitrates and pesticides are thought to pose serious risks to human health. This paper briefly reviews the sources of agricultural pollution of groundwater and the extent of the problem. It summarizes the various processes which take place in aquifers to remove, alter or attenuate contaminants. 相似文献
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A laboratory study was conducted to determine the effects of anaerobic vs aerobic conditions, sterile vs non-sterile conditions and mixing on the release of soluble ortho-phosphate from sediments obtained from Lake Carl Blackwell, Oklahoma. Eight laboratory systems reflecting various combinations of the three environmental conditions to be studied were investigated for a 30-day experimental period. Phosphate release under non-sterile conditions exceeded the release observed under sterile conditions in all systems regardless of whether they were anaerobic, aerobic, mixed or static. In addition, mixing enhanced phosphorus release under all the conditions investigated.Release of phosphate was observed under both anaerobic and aerobic conditions. Anaerobic release was greater than aerobic release in all cases except for two. The average release obtained in the aerobic mixed non-sterile systems was greater than the average release observed in the anaerobic static sterile systems and was equal to the average release observed in the anaerobic static non-sterile systems. This higher release under aerobic conditions could probably be attributed to mixing. 相似文献
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住宅是专供居住的房屋。随着国民经济的增长,生活水平的提高,现代的居民对住宅的功能也有了更进一步的认识。住宅不仅是居住的地方,更是娱乐、休息、享受的场所。因此,人们越来越倾向于个性的生活方式,对住宅的舒适度、室内设计也就有了一定的要求。 相似文献
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A.F. Roberts 《Fire Safety Journal》1982,4(3):197-212
When a flammable liquid with a vapour pressure greater than atmospheric is released from pressurised storage, flash evaporation occurs. The ignition of such a release is likely to create a fireball which creates a short lived, but intense, source of thermal radiation.The influences of the flash evaporation process on the mechanism of flammable cloud formation and the subsequent burning of the cloud are discussed. Published information is reviewed to provide insight into those features of fireball behaviour that are influenced by the initial degree of flash evaporation and those that are not. Correlations are presented that represent consensus views on the influence of mass of flammable substance in the release on fireball diameter, duration, and radiation output. 相似文献
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