Research on correlation between elastic modulus and CBR index of roadbeds in Dong Nai province

Research on correlation between elastic modulus and CBR index of roadbeds in Dong Nai province, Journal of Science of Lac Hong University, 2021

Nguyen Ba Ngoc Thao, Msc

Faculty of Civil Engineering, Lac Hong University, Viet Nam

Abstract: Currently, the determination of the elastic modulus (E0) is mainly indirectly through the lookup table depending on the soil type and moisture content or using empirical correlation E0 = 7.93 CBR0.85 (MPa). With the richness and diversity of soil types as in Dong Nai, the application of the above measure to give value (E0) has low reliability. The reason is that different soil types will have different value (E0), which greatly affects the thickness of the pavement structure during the design process. The study has given a calculation method to build the correlation function between E0 = f (CBR) to determine E0 more accurately and apply the research results to indirectly determine the value E0 dong. The comparison with the lookup table depends on the density and humidity (relative) to determine the E0 value used in calculating the strength of the pavement structure.

Keywords: Elastic modulus, CBR index.