Compression, Tension, and Fracture Energy Properties of Compressed Cement-Stabilized Earth Blocks

Abstract

This paper presents the recent experimental findings related to mechanical properties of compressed cement-stabilized earth blocks (CSEBs), prepared using indigenous soil from Hamilton County in Nebraska (United States) and manufactured using a manual model of the CINVA-Ram soil brick compression machine. A total of 56 specimens were tested to allow for a meaningful statistical assessment of the results. First, uniaxial compression tests were performed on individual blocks utilizing two materials that allow for varying degrees of lateral expansion: plywood and rubber capping. Then, the flexural tensile strength and fracture energy parameters were obtained from three-point bending testing. Under compression, capped with plywood, the blocks had an average strength of 6.09MPa, whereas the blocks capped with rubber had an average strength of 4.22 MPa, presenting a 30% reduction in estimated compressive strength when the material has allowed greater lateral expansion. Moreover, flexural testing was conducted on notched blocks with a notch-to-depth ratio of 0.5. The average flexural tensile strength (modulus of rupture) of these specimens was obtained as 1.28 MPa with an average fracture energy value of 13.98 N/m. These material properties are key to numerical modeling and analysis of individual blocks constructed with these novel and special-recipe materials, which are not adequately reported in the literature. This technical note contributes to the state-of-the-art by providing the most recent findings of strength parameters for researchers to utilize in their studies.