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Foamed concrete with five densities were prepared without sintering, then compounded with the humidity controlling slurry to prepare the sand-based breathing bricks (SBB). The accurate porous parameters of foamed concrete were characterized and quantified by Image-pro Plus 6.0 and Matlab 2015a. The effect of these porous parameters on the properties of the SBB were investigated. The optimal physical, mechanical and humidity controlling properties of SBB were achieved with FCa9 of foamed Concrete. The suitable dry density was 910 kg/m 3 with higher compressive strength of 5.25 MPa, thermal conductivity was 0.08 W·(m·K) −1 , the max moisture absorption was 272.51 g/m 2 and max moisture desorption was 143.09 g/m 2 , which can be used as a wall material for partitioning space to improve indoor air quality. [ABSTRACT FROM AUTHOR]

Products of porous bricks from low grade diatomite and sugar filter mud (SFM) in different proportion between 0 and 30 wt% were fabricated at sintering temperatures ranging from 700 to 900 °C. Effect on physical and mechanical properties of sinterring temperature and adding proportion of sugar filter mud were investigated. Physical and mechanical properties of samples were determined by DSC-TG thermal analysis, XRD, SEM and universal testing machine. The samples of porous bricks after sintering have acceptable performance parameters. The best combination of mechanical and physical properties is achieved for a mixture of 70 wt% diatomite, 20 wt%SFM with the additions of 6 wt% dolomite and 4 wt% sodium perborate sintering at 800 °C. The apparent porosity was 50.39%, bulk density was 1.25 g/cm 3 , the flexural strength was 10.05 MPa. [ABSTRACT FROM AUTHOR]