2026-04-19T14:04:57Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/111562025-12-18T01:05:30Zcom_10259_3969com_10259_5086com_10259_2604col_10259_3970

00925njm 22002777a 4500 dc Pérez Acebo, Heriberto author Linares Unamunzaga, Alaitz author Aragón Torre, Ángel author Gonzalo Orden, Hernán author 2025-11 The compressive strength is the primary parameter used for the design, control, and performance assessment of cementitious materials. However, this value is strongly influenced by specimen geometry, which has led to the introduction of shape coefficients to convert compressive strength results between different specimen types, particularly between cubes and cylinders. While this topic has been extensively investigated in concrete, very limited research has addressed the shape coefficient in soil-cement or cement-treated base materials, despite their widespread use in pavement construction. Aiming to bridge this gap, this study systematically analyzes the unconfined compressive strength (UCS) of soil-cement specimens with different geometries. Two soil-cement mixtures with distinct physical and chemical characteristics were tested at various curing ages (7, 28, and 90 days) using cylindrical specimens (150 mm diameter × 180 mm height) and cubic specimens (150 mm edge). The results show that the UCS in cylindrical specimens (UCScyl) was consistently higher than that of cubic specimens (UCScub), although the difference decreased with increasing compressive strength. By combining all datasets, a single conversion factor of 1.04 was derived, resulting in an equation, UCScyl = 1.04·UCScub, with an excellent determination coefficient (R2 = 0.99), enabling reliable conversion between cubic and cylindrical UCS results for soil-cement. https://hdl.handle.net/10259/11156 10.3390/buildings15234304 2075-5309 K shape coefficient Soil-cement Cement-treated base material Unconfined compressive strength Cylindrical specimen Cubic specimen Shape Coefficient for Soil-Cement: Experimental Determination from Cylindrical and Cubic Specimens