Effect of Attached Mortar Content of Recycled Coarse Aggregate on Frost Resistance Durability of Recycled Aggregate Concrete

Abstract

Abstract: Five kinds of commercial recycled coarse aggregate (RCA) with different attached mortar content were selected to prepare C40 recycled aggregate concrete under the condition of full substitution for natural coarse aggregate. The effect of attached mortar content of RCA on the frost resistance durability of recycled aggregate concrete under 30% of ultimate tensile stress level was discussed, and the mortar limit content based on relative dynamic elastic modulus and frost resistance durability factor was determined by mathematical fitting. The results show that there is a strong linear relationship between the loss rate of compressive strength of recycled aggregate concrete and the attached mortar content after freeze-thaw cycles. The mass loss rate, relative dynamic elastic modulus and frost resistance durability factor of recycled aggregate concrete have a quadratic function relation with the attached mortar content of recycled coarse aggregate. The relative dynamic elastic modulus of recycled aggregate concrete after 300 freeze-thaw cycles is reduced to 60% as the limit value, and the corresponding mortar limit content is obtained to be 49.52% (mass fraction). Taking the durability factor specified by different design service life and freeze-thaw working conditions as the defining conditions, the mortar limit content satisfying the corresponding durability factor under tensile stress is obtained. Finally, the rationality of the research results is verified by collecting literature data.

Key words: recycled aggregate concrete, recycled coarse aggregate, attached mortar, limit content, loss rate of compressive strength, mass loss rate, relative dynamic elastic modulus, frost resistance durability factor

CLC Number:

TU528.79

WEI Da, ZHU Pinghua, WANG Xinjie, LIU Hui, LIU Shaofeng, JIA Xuejun. Effect of Attached Mortar Content of Recycled Coarse Aggregate on Frost Resistance Durability of Recycled Aggregate Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 765-774.

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