Geopolymer is known as an alkaline alumino-silicate material that has many potential advantages to replace for cement-based materials. Geopolymer is a green material with low or non-CO2 emission technology, high strength and heat resistance, high chemical resistance, and low energy production. Geopolymer has synthesized from activated alumino-silicate resources in high alkaline conditions. After formed, the geopolymer samples are cured in different conditions such as room temperature, drying oven temperature (from 40°C to 150°C), high pressure and temperature conditions of autoclave equipment. In this study, the paper would like to introduce a new technique for curing the specimens. The geopolymer samples were cured in a microwave oven set by various regimes of curing time. After cured in microwave conditions, the samples were tested for engineering properties such as compressive strength (MPa), volumetric weight (kg/m3), and water absorption (kg/m3). This technology is a useful solution because of saving time for curing the geopolymer specimens in comparison with others (normally, it takes time for curing in 28 days). Microstructural characteristics of the fly ash-based geopolymer were analyzed and evaluated using scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR).
There is a move currently underway in the electronics industry to use environmentally friendly materials. This includes removing lead (Pb) from electronic assemblies and solder alloys. It also involves removing certain types of flame retardant materials from plastic and encapsulated integrated circuits. The new alternative materials are commonly referred to as halogen free or green materials. Restrictions by environmentally friendly organizations and nations are pressuring electronic manufacturers to develop alternate surface finishes and solder alloys. More expensive solutions are to use nickel/gold/palladium (Ni/Au/Pd) or Ni/Au. Another more cost efficient alternative solution is to use pure tin (Sn) or alloys that are Sn rich [1], [2], [3], [4].
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