Experimental Research on the Compressive Stress–Strain Behavior of Cement Stabilized Compressed Earth Blocks

Tóm tắt

This study investigates the compressive stress-strain behavior of Cement-Stabilized Compressed Earth Blocks (CSCEB) using local soil from Phu Tho Province, Vietnam. Nine mix designs were tested with cement contents of 0%, 8%, 12%, and 15% at dry densities of 1.8, 2.0, and 2.2 g/cm³. After 28 days of curing, unconfined compressive strength tests and strain measurements were performed using an Instron 5980 testing machine with strain gauges for accuracy. Results show that both compressive strength and elastic modulus increase significantly with higher cement content and dry density. The stress-strain curves reveal a three-stage response: linear elastic, nonlinear pre-peak, and post-peak softening, indicating a transition from ductile to brittle failure with increased cement and density. A strong correlation exists between compressive strength and elastic modulus, allowing for reliable predictions of material stiffness. These findings support the development of stronger and more sustainable building materials for housing in northern mountainous regions.