Investigation of Failure Mechanism of Geogrid Reinforced Porous Concrete Based on Experimental Test

ABSTRACT The breakage behavior and damage mechanisms of geogrid‐reinforced porous concrete (GRPC) were evaluated through uniaxial compressive loading tests. Cubic samples measuring 15 cm × 15 cm × 15 cm were constructed with layered aggregates, incorporating 1 to 3 geogrids positioned at angles of 0°, 45°, and 90°. Testing was conducted in a rock mechanics laboratory, and strain‐stress curves were analyzed to examine mechanical behavior and fracture mechanisms. The breakage process of the GRPC was categorized into three stages: crack initiation, propagation, and final breakage. Results indicated that the mechanics and failure stages of GRPC differed significantly from those of ordinary concrete. In GRPC specimens, failure was primarily attributed to the sliding of aggregates and geogrid bonding layers, with cracks tending to propagate in stress concentration areas formed by connected or unconnected pores. Increasing the number of geogrids resulted in fewer fractures and reduced damage area. In tests with a consistent number of geogrids and concrete age, the horizontal geogrid configuration demonstrated a higher young modulus and failure stress compared to the vertical arrangement. Additionally, horizontal geogrid reinforcement caused delayed failure, while vertical reinforcement led to rapid breakage. A reduction in the number of geogrids led to a shift in breakage type, resulting in a more rapid and abrupt failure.