The application of cement mixing as a ground improvement method for natural soils has gained prominence due to its cost-effectiveness and rapid construction. Soil when mixed with cement, undergoes significant changes, primarily influenced by the formation of cementation bonds. This transformed soil, with mechanical behaviour lying between traditional soils and rocks, poses challenges and opportunities for constitutive modeling. Laboratory experiments reveal that the impact of cementation on clays diminishes gradually with increasing deviatoric stress, attributed to the degradation of cementation bonds. Over the past four decades, the constitutive modeling of cemented soils has experienced notable advancements. Many constitutive models have been formulated, using the critical state framework, and the bounding surface plasticity concept to capture the behaviour of cement-treated soil. This paper provides a concise overview of the concept behind cement-treated soil and various constitutive models for cemented soil, including a crucial aspect: the breakage of soil–cement structure during loading. These insights are intended to benefit geotechnical engineers and researchers engaged in engineering design involving cemented soil structures, facilitating a more comprehensive understanding of their behaviour and implementation in numerical models.