The mechanical characterization of plain foamed concrete (PFC) and fiber-reinforced foamed concrete (FRFC) with a density of 700 kg/m³ was performed with compression and tension tests. FRFC was reinforced with the natural fiber henequen (untreated or alkaline-treated) at volume fractions of 0.5%, 1% and 1.5%. Polypropylene fiber reinforcement was also used as a reference. For all FRFCs, the inclusion of the fibers enhanced the compressive and tensile strengths and plastic behavior, which was attributed to the increase of specimen integrity. Under compressive loading, after the peak strength, there was no considerable loss in strength and a plateau-like regime was observed. Under tensile loading, the fibers significantly increased the tensile strength of the FRFCs and prevented a sudden failure of the specimens, which was in contrast to the brittle behavior of the PFC. The tensile behavior enhancement was higher when treated henequen fibers were used, which was attributed to the increase in the fiber–matrix bond produced by the alkaline treatment. The microscopic characterization showed that the inclusion of fibers did not modify the air-void size and its distribution. Higher energy absorption was observed for FRFCs when compared to the PFC, which was attributed to the enhanced toughness and ductility by the fibers. The results presented herein warrant further research of FRFC with natural henequen fibers for engineering applications.

Field blast tests were performed to investigate the effects of foamed concrete panels on structural response. Foamed concrete specimen with two densities and aluminum-alloy front face sheet were studied. Effects of four key parameters, that is, blast impulse, foamed concrete density, thickness of foamed concrete panel, and the thickness of front face sheet, on structural response were studied using ballistic pendulum system and laser displacement transducer. Deformation of the back panel protected by foamed concrete and the failure modes of foamed concrete specimen when subjected to blast load were obtained. Experimental results indicate that foamed concrete can be used to attenuate blast load and reduce structural deformation effectively.