Browsing by Author "Badua, Dean Aldrene O."

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    Design, construction and evaluation of Manual Pole-type Calamansi (Citrofortunella microcarpa) Fruit-harvester
    (Don Mariano Marcos Memorial State University - North La Union Campus, 2013-03) Badua, Dean Aldrene O.
    This study was conducted to design, construct and evaluate the performance of the calamansi fruit-harvester. The harvester was evaluated to determine its harvesting capacity, conveying efficiency, cutting efficiency, and the overall efficiency compared to the traditional methods of harvesting calamansi fruits. The study was conducted from July 20, 2012 - February 25, 2013. It was constructed at the EKV Machine Shop, Nagsabaran Norte, Balaoan, La Union and was tested at the calamansi project field of the DMMMSU-NLUC. The harvester has three main parts namely a) head assembly b) body assembly c) collecting assembly. The harvester had 41.55 g/min harvesting capacity, 95.32% conveying efficiency, 89.98% cutting efficiency, and an overall performance of 85.30% efficiency. The harvester still needs design revisions for higher performance, since it had the lowest performance. The harvester was comparable to picking with the use of ladder. However, calamansi farmers are safer with the harvester.
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    Effectiveness of rice (Oryza sativa) hull ash (RHA) as partial replacement of cement in concrete exposed in coastal conditions
    (PaperASIA, 2024-04-30) Badua, Dean Aldrene O.; Espiritu, Raffy M.; Gaudia, Nicole A.; Mazano, Ryan Christian A.; Santiago, Karen Joyce B.
    Cement use and production are among the largest contributors to greenhouse gases. Thus, we endeavor to utilize agricultural wastes to reduce the consumption of cement while improving the properties of the concrete. This study aimed to determine the effect of rice hull ash (RHA), as partial cement replacement, on concrete's workability, permeability, and compressive strength. Also, it aimed to compare the changes in compressive strength before and after exposure to coastal conditions and perform a cost analysis of concrete mixtures. This experiment used three different RHA loadings (5%, 10%, 15%) as partial replacement to cement. This study concludes that replacing cement with RHA resulted in low workability and lower chloride penetration. Also, replacing cement of up to 10% RHA has comparable compressive strength with pure concrete before exposure to coastal conditions. Replacing up to 15% of RHA has comparable compressive strength with pure concrete after exposure to coastal conditions. Using RHA replacement has a lower production cost than pure concrete.