Abstract
There are considerable resource reuse and environmental concerns regarding SiC sludge (SiCS) that results from cutting silicon ingots into wafers. In the current study, the effect of the Na2SiO3 solution/sodium hydroxide solution (NS/SS) mass ratio and SiCS amount on metakaolin geopolymers was found during geopolymerization system performance. The results indicate that while NS/SS ratio was relatively low, increasing the NaOH content resulted in a sufficient amount of OH− in the system to increase the solubility and hinder polycondensation, as indicated by the bulk density and setting-time results; since the polycondensation was inhibited, the mechanical strength was reduced. This study demonstrated that a geopolymer can be formed from a substitution of 10% SiCS and with an NS/SS ratio of 1.6, and that this geopolymer is a feasible material.
Highlights
Silicon carbide (SiC) is widely employed in high-temperature application [1,2] on account of its high strength properties as well as oxidation resistance
For an Na2SiO3 solution/sodium hydroxide solution (NS/SS) ratio of 0.8 and 28 days curing, samples were prepared with 0%, 10%, 20%, 30%, and 40% SiC sludge (SiCS) contents with bulk density are 1.23, 1.22, 1.21, 1.21, and 1.19 g/cm3, respectively (Figure 1a)
As the bulk density increases, the mechanical strength of geopolymer increases as showed by Heah et al (2012), because the
Summary
Silicon carbide (SiC) is widely employed in high-temperature application [1,2] on account of its high strength properties as well as oxidation resistance. SiC is used in cutting tools [3] and armor [4]. Among its many applications in various arenas, SiC has been employed widely in cutting tool uses, especially for cutting silicon ingots. A large amount of SiC sludge (SiCS) is produced in cutting silicon ingots, causing serious environmental pollution. The recycling of SiCS could reduce environmental pressure and improve resource reuse. The chemical properties of SiCS are the same as that of SiO2 and Al2 O3. The application of SiCS in enhancing the properties of geopolymers was studied
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