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_aLeyba, Duanie P.
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_aCompressive strength of concrete using superplasticizer and rice husk ash as supplementary cementitious material /
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_cDuanie P. Leyba.
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_ax, 53 pages
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_aThesis (M.A.) -- Pamantasan ng Lungsod ng Maynila, 2005.;A directed study presented to the faculty of Graduate School of Engineering in partial fulfillment of the requirements for the degree Master of Engineering (MEng) with specialization in Structural Engineering.
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_aABSTRACT: This study aims to determine the compressive strength of concrete using superplasticizer and rice husk ash as supplementary cementititious material. It includes the selection of appropriate water and cement ratio and the establishment of the ratio of cement to rice husk ash. Moreover, it considers the constant amount of superplasticizer and its application on structural purposes. Furthermore, it intends to compare its cost and compressive strength to the ordinary mix concrete with superplasticizer. Experimental method of research was used in conducting the technical evaluation of mixing and proportioning design method of concrete. The experiment was simplified with the help of the instruments or apparatus for mixing of concrete, slump test, unit weight test and compression test. The study concludes that the incorporation of superplasticizer in a concrete mixture reduced the water content, improved workability, obtained high slumps, and increased the compressive strength of a concrete even without rice husk ash. The results revealed that addition of rice husk ash in a concrete mixture resulted in higher water requirement. In addition, the result also explained that a dosage percent of superplasticizer by Portland cement weight in a concrete mixture with 15% replacement of Portland cement by rice husk ash as supplementary cementititious material increases its material cost. Finally, it is recommended that further study should be conducted to determine the water absorption capacity of the rice husk ash and the optimum amount of superplasticizer that can be added to enhance and develop the compressive strength of a concrete. Likewise, further investigation should also be carried out for other properties of concrete using superplasticizer and rice husk ash as supplementary cementititious material.
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