Abstract

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Title:: Review on Durability of Lightweight Aggregate Concrete in Atmospheric Environment

Author(s):: WU Tao; SUN Yi-jia; LIU Xi; School of Civil Engineering, Chang’an University

Keywords:: structural engineering; lightweight aggregate concrete; carbonation; prediction model; influence factor

Abstract:: The work and research results on durability of lightweight aggregate concrete in atmospheric environment by domestic and foreign scholars were introduced.The difference of carbonation mechanism between lightweight aggregate concrete and normal concrete was analyzed. Main factors influencing the carbonation of lightweight aggregate concrete were expounded in details.The merits and disadvantages of existing prediction models were elaborated. The results show that the existing researches mainly focus on rapid carbonization tests, while studies of actual structures are mainly conducted in the 20th century. The prediction models are mainly established based on experiments rather than theoretical analysis. Finally, there is a lack of experimental verification for carbonization predictions in atmospheric environment.It is suggested that the researches should be conducted in the perspective of macro-scale and meso-scale. Further research on lightweight aggregate concrete time-varying regularity in the real and accelerated environments necessary. The theoretical models for lightweight aggregate concrete carbonation reaction need to be established based on chemical kinetics and diffusion mechanism．Durability of lightweight aggregate concrete under the complex corrosion environment and coupling effects of mechanics and environment should be analyzed in future.