共查询到5条相似文献，搜索用时 15 毫秒
1.
石质文物表面防护中的问题和新材料 总被引：14，自引：6，他引：14
野外的大型石质物暴露在自然界的风化环境中,近代环境污染和酸雨使侵蚀更加严重,已有许多防护材料用于石质物的防护,本分析了目前防护材料,特别是憎水性有机高分子防护材料在使用中存在的问题,并初步探索了使用新的生物无机防护材料的可能性。 相似文献
2.
Emily McSkimming 《International Journal of Architectural Heritage》2015,9(4):497-509
Sydney (Yellow Block) Sandstone is the primary building material used in many nineteenth century buildings in Sydney, Australia. As a natural material, it is subject to deterioration in the salty environment and in extreme cases will need to be removed and replaced. Two cornice pieces have been removed from State Heritage Registered, the Australian Museum due to evidence of visual decay patterns including surface degradation, slight sanding, granular disintegration, contour scaling and flaking, pitting, discoloration, soiling, alga growth and there are missing parts. Stone samples removed from within these building elements were tested for their engineering properties after over 100 years of natural exposure. It was found that the stone has become weaker, softer, less durable, and has an increased capacity to absorb water. The stone was found to be more susceptible to attack from sodium sulfate ingress as opposed to sodium chloride, which would have contributed to the weathering effects noted on the stone. The degree of exposure experienced by each building element was also found to be a factor in the loss of stone quality. 相似文献
3.
ABSTRACTFire is one of the most severe threats to stone applied in civil engineering and architecture. In most cases, its effects are irreversible and have long-lasting repercussions. In addition to aesthetic alterations, fire can also induce important mineral-chemical, physical, and mechanical changes in stone. Research concerning the effects of fire on stone materials in recent decades has been providing valuable knowledge to inform present and future conservation and restoration actions. In this literature review, the properties and techniques used for studying the effects of fire on stone materials are appraised, summarized, and compiled. A comprehensive and practical overview of those effects is also given. Open porosity and P-wave ultrasonic velocity are the physical and mechanical properties that have been studied most. Other frequently researched areas include chemical-mineralogical changes, color, density, water absorption, uniaxial compressive strength, and modulus of elasticity are also very frequently investigated. 相似文献
4.
贾兰坡先生提出华北地区旧石器存在分别以大型石器与小型石器为特征的两大文化传统.本文通过对华北地区主要的旧石器遗址和地点文化特征的总结分析,发现石料的分布和两大文化传统的分布是完全重合的.所以,这种大小石器的分布区域不是文化因素的结果,而是自然资源(石料)分布差异的结果.所谓华北旧石器两大文化传统,是在受到原料制约的情况下自然产生的文化面貌. 相似文献
5.
南唐二陵墓室在春夏之交、夏秋之交时产生大量冷凝水,严重危害墓室彩画安全。为此,在查阅文献资料和实地调研后,自2013年7月至8月对墓室内外环境温湿度进行了监测记录。结果表明:墓室内相对室外为持续低温(22℃)高湿(RH=100%)的状态,对彩画保存非常不利。随后结合室外温湿度测量记录数据,分析了冷凝水产生的原因。在此基础上,提出通过安装风幕机、除湿机对冷凝水进行治理的措施,并继续对治理效果进行跟踪测量记录,结果显示该措施能够有效降低墓室内相对湿度(RH=90%),对去除墓室内冷凝水进而保护墓室彩画有重要作用。 相似文献