This　paper　presents　results　of　biaxial　compressive　tests　and　strength　criterion　on　two　replacement　percentages　of　recycled　coarse　aggregate　(RPRCA)　by　mass　for　plain　structural　recycled　aggregate　concrete　(RAC)　at　all　kinds　of　stress　ratios.　The　failure　mode　characteristic　of　specimens　and　the　direction　of　the　cracks　were　observed　and　described.　The　two　principally　static　strengths　in　the　corresponding　stress　state　were　measured.　The　influence　of　the　stress　ratios　on　the　biaxial　strengths　of　RAC　was　also　analyzed.　The　experimental　results　showed　that　the　ratios　of　the　biaxial　compressive　strength　sigma(3f)　to　the　corresponding　uniaxial　compressive　strength　f(c)　for　the　two　RAC　are　higher　than　that　of　the　conventional　concrete　(CC),　and　dependent　on　the　replacement　percentages　of　recycled　coarse　aggregate,　stress　states　and　stress　ratios;　however,　the　differences　of　tensile-compressive　ratios　for　the　two　RAC　and　CC　are　smaller.　On　this　basis,　a　new　failure　criterion　with　the　stress　ratios　is　proposed　for　plain　RAC　under　biaxial　compressive　stress　states.　It　provides　the　experimental　and　theoretical　foundations　for　strength　analysis　of　RAC　structures　subject　to　complex　loads.