Analysis And Research On Durability Parameters Of Concrete Structures In Marine Environment Civil Air Defense Engineering

Since concrete was applied in civil engineering construction,the concrete durability problem is serious due to design inconsiderateness,construction quality cannot be guaranteed,external environment and other factors,and the economic loss caused by it cannot be ignored.Since the founding of the People's Republic of China,China's coastal cities have always been the focus of economic construction,In order to enhance the urban security capability of coastal areas,China began to build civil air defense in 1950.However,the civil air defense engineering of coastal area are always in the service environment of high temperature and high humidity,and have been affected by carbonization and chloride ion erosion for a long time,this accelerates the durability destruction of concrete structure of civil air defense engineering,therefore,the research on concrete durability of civil air defense engineering under the joint action of the two is the focus of civil air defense engineering construction at present.This paper takes the civil air defense project of Marine environment as the research object,based on the investigation of the internal service environment of the civil air defense project and the detection of the structure of the early civil air defense engineering,analysis of research date,consider the special characteristics of the marine environment and civil air defense engineering,and determines two important factors that affect the durability of concrete structure: carbon dioxide and chloride,based on this,the dry wet cycle test is designed to study the durability of civil air defense concrete structure in marine environment by measuring the compressive strength,carbonation depth,calcium carbonate content and free chloride ion content.The details are as follows:?1?Investigate the internal service environment of some typical civil air defense projects in Qingdao and Weihai,through the real-time monitoring of CO₂ concentration,temperature and humidity in civil air defense engineering,determine the test design parameters,and through the concrete quality inspection of two actual civil air defense engineering in Qingdao area to research the durability question of civil air defense engineering.?2?Adopting the actual mix proportion of concrete used in one's anti-engineering project,explore the influence of fixed amount of expansive agent on compressive strength of concrete blocks under different curing ages and effects of expansion agent on free chloride ion content and carbonization depth in concrete under different circulation systems.?3?Through the dry and wet cycle test,the influence of different concentration of chlorine salt soaking and cycle times on the carbonization depth and the content of calcium carbonate in concrete are studied,and the effects of different carbonation age and cycle times on the free chloride content in concrete are studied.