Comparative study of lead coated reinforcementbar (lcrb) Emmanuelle M. Martinez... [et. al]

Thesis (Bachelor of Science in Civil Engineering) -- University of Rizal System-Morong.

EXECUTIVE SUMMARY: The study focused to determine and compare the mechanical properties between the Lead Coated Reinforcement Bar (LCRB) and the Conventional Reinforcement Bar. Also, the corrosion rating comparison and cost benefit value of LCRB between the two other coated bar which are the fiber glass resin coated and epoxy coated. The output product of LCRB and CRB were both undergone a laboratory testand so to have the values of its mechanical properties mainly the tensile strength, yield strength, and elongation. The samples had resulted the values for the yield strength of the LCRB with a value if 312 kg/mm2 is greater than the CRB which has 287 kg/mm2. Both sample got the same result of 462 kg/mm2 for the tensile strength, and a small difference value of 21% and 20.50% for the elongation. In terms of the corrosion experiment, the lead coated corrodes first than the two other coated bars. Second to react from the corroding agent solution is the fiber glass resin coated bar, and lastly is the epoxy coated bar. As an observation, the application process count to be a great factor to resist corrosion. Lead is less usable to become barrier coating for the diffusion of chemical and water-soluble chloride ion to prevent the formation of rust and reducing the risk of corrosion of rebar. These data information was gathered for a span of seven (7) days while the process of submerging the reinforcement bars into sodium chloride solution takes place. A week of observation is due into 5 periods of time (6 hours, 12 hours, 3 days, 6 days, and 7 days). The researchers conclude that LCRB is economically feasible rather than other coated materials considering that it is recorded to have the lowest price of 35 php as the total cost since a kilogram of lead charges 70 php. The technical design discusses the method used such as experimental, development, comparative, and evaluative design. The experimental research process was done to determine the corrosion rate of each coated bar. While the developmental research is for the production of coating the reinforcement bar by lead. The comparative part of this research covers the mechanical properties between the Lead Coated Reinforcement Bar (LCRB) and Conventional Reinforcement Bar, corrosion reaction between the three samples of coated bar (lead, fiber glass resin, and epoxy). The researchers concluded that the coating of lead to conventional reinforcement bar added up properties into it. there's no difference in tensile strength and does not really affect the elongation even when lead is applied to a CRB. Lead increases its yield strength. This experiment came up that the LCRB is not that effective in terms of corrosion both due to carbonation and chloride attack compared to epoxy and fiberglass resin coated bar. It falls to become a barrier coating for the difflusion of chemical and water-soluble chloride ion to prevent the formation of rust and reducing the risk of corrosion of rebar. Lead coated reinforcement bar (LCRB) can be considered to be an option of either using the conventional reinforcement bar since it has the lowest price of materials in its production. Future researchers may conduct further study to provide other way of producing LCTB in the most convenient process and to improve its quality and property in terms of bond strength. To conduct more research to develop the potential; of using lead as an alternative materials in coating reinforcement bar. To seek authorities as well as companies and firms to deal in producing LCRB. To compare the economic value of the other coated bars in the Philippines aside from fiber glass resin and epoxy coated.