Study on physical and mechanical properties of concrete three-hole brick prepared by village construction waste

Village abandoned clay bricks were used to prepare concrete three-hole brick. The influence of admixture coating of aggregate on physical and mechanical performance of concrete three-hole brick has been studied. Using surface-coating aggregate-by-admixture mixing method, by changing the species and content of admixture, compressive strength, water absorption, softening coefficient of three-hole brick modified by admixture were measured. The results show that with surface coating of aggregate by admixture during mixing, physical and mechanical properties of concrete three-hole brick can significantly be improved; modification effect of slag is better than fly ash; When recycled aggregate quantity was 40% and slag content was 30%, the modification effect was optimal. Compared with unmodified three-hole brick, strength of which increased from 42.1MPa to 45.6MPa; softening coefficient increased from 0.87 to 0.95; water absorption decreased from 18.7% to 6.4%; these properties meet national standards of wall materials.