Abstract: Foamed concrete sandwich panels were prepared by using calcium silicate boards as the skin layer and fiber-reinforced foamed concrete as the core material.Then,the influence of the polypropylene fiber dosage and the core material density on the structure performance of the prepared sandwich panels under compression was investigated,and the stress-strain curve equations were established through the regression analysis of compressive stressstrain curves.The results show that ( 1) as the fiber dosage in the core material increases from 0 to 2 kg /m³,the crack number of the core material decreases,while the compressive strength and the compressive toughness index increase respectively by 76. 08% and 30. 03%; ( 2) as the core material density increases from 400 kg /m³ to 600 kg /m³,the failure mechanism of the prepared sandwich panels gradually changes from single damage to overall destruction,with a greater increase in the compressive strength but a smaller increase in the compressive toughness index; ( 3) the stress-strain curves of the prepared sandwich panels can be divided into four stages,namely,elastic strain,stress hardening,strain softening and failure; ( 4) the peak strain increases with the increase of the fiber dosage,while the core material density has less effect on the peak strain; and ( 5) interface cracks and a delamination phenomenon may occur in the prepared sandwich panels under compression.

Key words: foamed concrete, calcium silicate board, polypropylene fiber, sandwich panel, compressive strength, toughness index