Researchers aim to find a new type and environment-friendly constructional material to replace the conventional material and then high carbon emission from use of conventional constructional material included normal cement and conventional concrete could be avoided. In order to confirm the new material could be used in constructional industry for low-medium grade buildings successfully, researcher investigates the mechanical performances and durability of this new material, high volume fly ash concrete made with recycled aggregates, and research the structure of material at micro-structure aspects. It is hope that a low-carbon and low energy material will be promoted in industry.