Per: KARINE MIRANDA DE SOUZA TAVARES (UENF), Laimara da silva barroso (uenf), Maria mariana dias pereira (uenf), mariana gomes pinto cherene (uenf), letícia barcelos de sousa (uenf), gustavo de castro xavier (uenf), sidnei josé gomes sousa (faetec), afonso rangel garcez de azevedo (uenf), sérgio neves (ime)
Abstract:
Demolition waste is waste composed of debris, coming from structural elements, rubble and renovations. Its potential has been the subject of study by researchers who observed that through heat treatment it is possible to promote dehydration, forming hydrated calcium silicates, which when in contact with water again, are capable of partially recovering the strength of the cement matrix. For this reason, this work analyzed the physical-mechanical characteristics of Plaster Cement Residue (RCR) dehydrated at 550°C and crushed, through laser granulometry, X-ray Diffraction (X-RD) and isothermal calorimetry analyses. Once in the hardened state, prismatic specimens (4x4x16) were made for testing density, mechanical resistance, void index and water absorption by capillarity and immersion. The mixture developed was 1:6 (cement:sand), with replacement proportions of 0, 10, 20 and 30% of the fine aggregate by RCR and CPV ARI cement was used. The results showed that replacing sand with RCR promoted significant improvements in the mechanical and technological properties of the mortar, increasing mechanical resistance, reducing the void index and absorption both by capillarity and immersion.