Abstract: The recycled debris mortar compressive strength and micro porosity were chosen as indexes to research the influence on compressive strength with alkali-activated at different temperature, which was combined with the XRD diffraction pattern of part recycled debris mortar samples.It is found that alkali-activated and temperature have important influence on strength by comparing the experimental research.It is found that the alkali and the recycled concrete powders ratio and the curing temperature had great influences on stimulating recycled concrete powder mortar strength.If alkali excitation temperature is too low, the reaction rate is too slow and during a certain period, the gelling material is less, and the compressive strength of recycled mortar in high porosity is lower.And vice versa.Therefore, the alkali-activated reaction at the most suitable temperature brings most gelling material, and the compressive strength of the mortar is the best.

Key words: recycled debris;active excitation;compressive strength;porosity