Preventive Conservation Of Concrete Of Beijing Heritage Buildings In 20^th Century

Beijing as a history of more than 3000 years of construction and more than 3000 years the world famous ancient capitals, with many heritage buildings in modern times, they witnessed in the history of the 20 th century, Beijing is the important carrier of Beijing and even the modern history of China culture. A concept or technical reasons, however, Beijing heritage building protection work of the 20 th century there are many problems, one of the prominent is the protection of concrete material and preventive protection theory research is insufficient.Concrete is one of the largest building materials, use all over the world in the 20 th century in the late 19 th century since the westernization movement was introduced into China, its use throughout the Qing dynasty, to witness the urban development of Beijing. The preventive protection is appeared in the new concept in the field of heritage building protection in recent years, by all means to reduce degradation risk elimination of heritage buildings, currently in the domestic research has just started.The idea of this article attempts to the preventive protection combined with concrete heritage building protection, by studying the heritage building preventive protection framework, heritage buildings degradation phenomenon and mechanism of concrete material, consolidating the heritage building material of concrete preventive measures. Full text is divided into six chapters:The first chapter, introduction. Introduce the research object and research background, research framework.The second chapter, based on the preventive protection theory and the technical evaluation of the heritage building preventive protection framework of research. First of all, the paper discussed the preventive protection theory and technology at home and abroad, and then sort out the heritage building preventive protection framework.The third chapter, the material properties of concrete and typical degradation phenomenon. Based on Beijing hundred heritage building field surveys of the 20 th century, sums up the Beijing heritage building concrete material typical degradation phenomenon TAB in the 20 th century, and analyzed.The fourth chapter, Beijing heritage architecture in the 20 th century the degradation mechanism of concrete material. Single factor and multi-factor coupling was studied under the action of the degradation mechanism of concrete material, points out that the core of preventing degradation is to weaken the physical permeability of concrete.The fifth chapter, Beijing heritage building preventive protection measures of concrete material in the 20 th century. Together the research efforts of chapter two to four, the preventive protection theory used in the protection of the concrete material, targeted protection measures are put forward.The sixth chapter, conclusion. The contents of the full text summary and outlook for Beijing heritage building material of concrete preventive protection in the future.