Abstract
The properties of alkaline activated brick dust mixed with water glass with a silicate modulus (Ms) of 1.0 were studied in fresh mixtures as well as hardened products in connection with the particle size of the dust. The brick dust (ground waste brick) was separated into 5 fractions according to particle size. The influence of particle size on the rheological properties of the fresh mixtures was studied via measurements of the yield stress and viscosity. The flexural and compressive strengths of the hardened products were determined after storage under laboratory conditions for 7, 14 and 90 days; the influence of 7 days of curing at 65°C on strength was evaluated as well. The microstructure of the hardened products was studied by means of porosimetry and SEM.
Highlights
Bricks are produced by the burning of clay minerals
This is due to the decrease in amorphous phase content as brick powder particle size increases
This paper has focused on the properties of fresh and hardened alkali-activated brick powder pastes in connection with the grain size of the powder
Summary
Bricks are produced by the burning of clay minerals. During this process, a certain amount of amorphous phases of aluminosilicates are formed. Reig et al [1] activated red clay brick waste using sodium hydroxide and sodium silicate solutions They studied the effects of several variables, mainly concentration of NaOH, SiO2/Na2O ratio and water/binder ratio on the porosity, composition and morphology of reaction products. Komnitsas et al [3] focused on the effects of the particle size of waste brick powder and the temperature of curing on the properties of hardened pastes. They studied the aging period, the temperature of curing and the effect of freeze-thaw cycles on compressive strengths. Pastes with SiO2/Al2O3 ratios of 0.8 and 0.9 exhibited open porosity and water vapour permeability fairly similar to those of historic lime-based mortars
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