In the midst of the health crisis due to the ongoing Covid-19 pandemic, traditional medicine is an alternative that can be used by the community to break the chain of transmission and maintain body immunity. Immunity is important during the Covid-19 pandemic. The better a person's immune system is to fight infection, the less likely a person is to get the disease. The community has a very important role in efforts to develop traditional health by utilizing medicinal plants. Ginger and Turmeric are types of medicinal plants that are widely used as kitchen spices, and have benefits for increasing the body's immunity. The content of cincol and zingiberen in ginger acts as an antioxidant that can improve the work of the immune system. While turmeric contains curcumin compounds which act as an antiviral. The purpose of this research is to provide skills to the people of Muara Fajar Timur Village in processing medicinal plants into herbal products that are delicious to consume, useful for increasing immunity, and have economic value. Activities are carried out by direct training methods and distribution of herbal products to the community. The result of this activity is that the community can understand and be able to make herbal medicine. The success of this activity can be seen from the responses in the form of questions and answers and discussions with the training participants, the high interest of participants in participating in the activity and the benefits derived from this activity. This shows that this activity has been successfully implemented in Muara Fajar Timur Village, Rumbai District, Pekanbaru.
The compressive strength of coal fly ash-based geopolymers has been improved by integrating the graphene nanosheets (GNs) as additive. Proximate analysis and crystal structure were also investigated using atomic absorption spectroscopy (AAS) and X-ray diffractometer. The geopolymer composites were created by mixing the solid fly ash and sand (weight ratio of 1:3) with 10 M NaOH and sodium silicate (Na2SiO3) solutions (weight ratio of 1: 2.5), where the liquid to solid weight ratio reached an economical composition of 1: 4. Low-cost GNs with various concentrations of 5 – 20 mg/ml was then added to the mixtures. The prepared mixtures were poured into mortar molds and allowed to stand for few hours at room temperature before heat treatment (curing) in the oven at various temperatures of 40°C, 60°C, and 80°C for 24 hours. Investigation results showed that the average compressive strength of geopolymer increased about 113.8 % or more than double compared to geopolymer without the addition of GNs. The highest compressive strength (29.5 MPa) was shown by a sample with GNs of 20 mg/mL and a curing temperature of 8°C. Meanwhile, geopolymer without GNs showed the lowest compressive strength in all curing temperatures. Proximate analysis showed that fly ash used in this work was the high calcium of type-C fly ash with the CaO content of 11.18%. XRD analysis results indicated that the GNs had integrated well in the geopolymer matrix. The presence of graphene-like structure was also detected, but it was not agglomerated with GNs. Good compressive strength and inexpensive production processes make this geopolymer very prospective for further development.
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