This　technical　note　presents　the　behavior　of　dam　and　sieved　concretes　in　uniaxial　tension　and　compression　together　with　the　effects　of　curing　age　on　large　size　specimens　of　450　mm　X　450　mm　X　900　mm　(prism　shape)　and　450　mm　X　450　mm　X　450　mm　(cube　shape)　and　small　size　specimens　of　150　mm,　X　150　mm　X　350　mm　and　150　mm　X　150　mm　X　150　mm,　respectively.　The　complete　stress-strain　curves　both　in　tension　and　compression　were　acquired　through　a　systematic　experimental　program.　The　specimen　ages　varied　from　7　to　180　days.　Models　with　hyperbolic　form　are　proposed　to　estimate　the　tensile　and　compressive　strengths,　the　elastic　modulus,　and　the　fracture　parameters　of　the　concretes　with　effects　of　specimen　ages.　On　top　of　that,　the　maximum　crack　width,　fracture　energy,　and　brittleness　of　dam　concretes　were　also　obtained　based　on　the　stress-deformation　curves.　It　was　found　that　the　strengths,　modulus　of　elasticity,　and　fracture　energy　increase　with　specimen　age,　and　that　the　specimen　size　and　maximum　aggregate　diameter　significantly　affect　the　fracture　energy,　peak　strain,　and　crack　width　of　concretes　in　uniaxial　tension.