Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 42 2 2010 10 23 Secondary Compression Characteristics of Northern Parts of Iran Soils Based on (ca/cc) Concept Secondary Compression Characteristics of Northern Parts of Iran Soils Based on (ca/cc) Concept 59 68 178 10.22060/ceej.2010.178 FA Mehrab Jesmani Ramin Vaezi Journal Article 2014 03 16 On the end of 1970s.The concept of (C<sub>a/</sub>C<sub>c</sub>) was developed by Mesri et al. in order to analyze the secondary compression settlements. There is a general acceptance in the (C<sub>a/</sub>C<sub>c</sub>) concept after many investigations made with different soil specimens. <br />We have found no studies signifying the properties of secondary compression of the soils in various part of Iran considering constant (C<sub>a/</sub>C<sub>c</sub>) concept, also there were no reports on the value of (C<sub>a/</sub>C<sub>c</sub>) ratio on Iran’s soils. So,in this paper the secondary compression behavior of Iran’s soils was investigated through the performance of a series of conventional and long-duration one-dimensional consolidation tests conducted on undisturbed samples from six different sites in the central and northern parts of Iran. The characteristics of secondary compression index were examined, and the relationship between the coefficient of secondary compression, (C<sub>a</sub>), and the compression index (C<sub>c</sub>), was established for all of these soils. The results of comparison between secondary compression index equations and (C<sub>a</sub>/C<sub>c</sub>) ratio concept show the ability of this concept to estimating the secondary compression index of samples On the end of 1970s.The concept of (C<sub>a/</sub>C<sub>c</sub>) was developed by Mesri et al. in order to analyze the secondary compression settlements. There is a general acceptance in the (C<sub>a/</sub>C<sub>c</sub>) concept after many investigations made with different soil specimens. <br />We have found no studies signifying the properties of secondary compression of the soils in various part of Iran considering constant (C<sub>a/</sub>C<sub>c</sub>) concept, also there were no reports on the value of (C<sub>a/</sub>C<sub>c</sub>) ratio on Iran’s soils. So,in this paper the secondary compression behavior of Iran’s soils was investigated through the performance of a series of conventional and long-duration one-dimensional consolidation tests conducted on undisturbed samples from six different sites in the central and northern parts of Iran. The characteristics of secondary compression index were examined, and the relationship between the coefficient of secondary compression, (C<sub>a</sub>), and the compression index (C<sub>c</sub>), was established for all of these soils. The results of comparison between secondary compression index equations and (C<sub>a</sub>/C<sub>c</sub>) ratio concept show the ability of this concept to estimating the secondary compression index of samples Fine-Grained Soils Secondary compression (Ca/Cc) concept https://ceej.aut.ac.ir/article_178_4f2a10c45ccf24029f9aab41d34cdffb.pdf