Study On In - Situ Anticorrosion And Reinforcement Of Ancient Building Wood Components

Ancient architecture as a kind of non-renewable cultural heritage, is an effective carrier of cognitive history, inheriting civilization. Ancient architecture in China is famous for its unique structure and form, and the most ancient architecture framework is wooden artifacts. Wood, as the raw material of plant, has obvious biological features. After a few hundred or even thousands of years of natural aging, due to the impact of the external factors such as the environment of biological, physical and chemical factors. Under the condition of proper temperature, humidity, the wooden artifacts of the ancient architecture was vulnerable to biology and microbial damage on the surface of the wooden, wood decay or bug eat by moth in the wood, which result in the damage of ancient timberwork and physical and mechanical performance is reduced, resulting in timber structure damage. How to improve the state of conservation of ancient buildings of wood components, without damaging the wood characteristics, while extending their shelf life, becoming a major problem faced by the current conservation workers.Properties changes of the wood components are closely related with the life of the ancient architecture, it is the internal factors affecting the strength of wood components. The reasons of the properties changes of the wood components mainly includes:natural aging, environment dust, acid harmful substances and pollutant coverage erosion; Biology and microbial destruction. In which, biological and microbiological destruction of the wood components were the most serious. Therefore, to prolong the life of the ancient architecture must take modification research for the properties changes of the wood components.With the development of materials science and wood protection science and technology, it was found that while maintaining the original texture of the wood and other wood rustic nature of the premise, through a series of physical and chemical treatment methods, making the wood components of ancient architecture can be modified to overcome the shrinkage of wood swelling, poor dimensional stability, anisotropy, flammable, corrosion pest poor performance and ease of discoloration shortcomings, and eventually extend its life, enabling valuable member of the existing old buildings of wood protection lasting repair.This thesis mainly, is the wood components of ancient architecture of wood chemical modification of processing to achieve the improvement of the strength of timber anticorrosion performance and ontology. By in situ synthesis of inorganic composite wood, inorganic substance as strengthen the body, through certain methods of in situ dispersed into wood substrate, thereby gaining a wood/inorganic compound material chemical modification method. Since the sol-gel method can be hydrolyzed organic silicon compound obtained sol, it is possible without damaging the structure of the timber into the interior of wood, and the wood substrate by cross linking active role in achieving the composite wood substrate. Then, with the wood components of ancient architecture as the research object; wood matrix microstructure as reactor; based on the principle of biomineralization, using TEOS penetrate or impregnated the wood substrate to prepared the chlorothalonil-DDAC/fluoride wood/SiO2 composite with doped preservative agent by sol-gel in situ synthetic method. In addition, by studying the active site in reaction process and reaction mechanism of the wood components, waterborne fluorine, anticorrosive reagent, TEOS, we finally speculated that the mechanism of compound material in situ synthesis, constructed the theoretical model of composite material.Chapter 1 summarized the foreign and domestic research of the SiO2/wood composite, and described the reaction mechanism for preparing SiO2/wood composite by sol-gel method and its influencing factors. Chapter 2 to chapter 4 mainly introduces the technological process of the in situ synthesis of SiO2/wood composite material, and the performance of the compound material and microstructure were also have been characterized. Chapter 5 and chapter 6 mainly introduced the in-situ consolidation and restoration engineering application cases for Xi’an Hanguangmen Museum and Andingmen tower ancient architecture. It can be seen from the restorative effect of engineering application, by the chemical modification of the wood components of ancient architecture, it antiseptic and antibacterial, weather resistance, loss of weight gain rate of wood, density, strength all have been improved significantly.