Dynamic Constitutive Model of Seawater and Sea Sand Recycled Aggregate Concrete under Compression
ZHANG Qingtian
ZHANG Kaijian
Abstract：A test of the uniaxial compressive stress-strain curve under different strain rates was carried out on seawater and sea sand recycled aggregate concrete(SSRAC)considering different ages and shell contents.The results show that the 600 d peak stress and peak strain of SSRAC increase by 10.4%and 23.2%,respectively,as compared with those of natural aggregate concrete(NAC).However,the elastic modulus of SSRAC decreases by 29.1%.The strain rate sensitivity of SSRAC increases with the increase in shell content.Then,based on the model in GB50010,a dynamic constitutive model is proposed for SSRAC under medium and low strain rates(from 10-5 s-1 to 10-1 s-1)considering the dynamic increase factor of characteristic parameters.Finally,mechanism analyses of the characteristic of its stress-strain curves are given.
Keywords：recycled aggregate concreteseawater and sea sanduniaxial compressive stress-strain curvestrain ratedynamic increase factor
Publication Date：2024-07-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 580-588,610 )