A study on the effects of cold-joints on reinforced fly ash concrete mixed with seawater under varying curing conditions

• Main Authors: Adre, Francis Louise B., Angeles, Kirstie Mae B., Monedero, Raymond Ariel C., Usal, Janelle Mae G.
• Format: text
• Language: English
• Published: Animo Repository 2016
• Subjects: Reinforced concrete > Corrosion
• Online Access: https://animorepository.dlsu.edu.ph/etd_bachelors/9916
• Institution: De La Salle University

The basis of the research was to simulate the corrosion behavior of reinforced concrete in structures using rectangular reinforced concrete specimen with reference to fly ash ratios and curing techniques since buildings experience varying conditions. The materials used include: ordinary portland cement, fly ash, freshwater, seawater, reinforcing bars, fine and coarse aggregates and concrete specimen molds. Cylindrical specimens with no reinforcing bars were first casted for compressive testing and were tested at 7th and 28th day. Rectangular prism specimens with reinforcing steel and cold-joints were then casted and cured using seawater and freshwater water immersion and coastal environment exposure. These were then tested for corrosion using sero-resistance ammeter for a period of 8 weeks. From the results, good corrosion resistance was exhibited in specimens with fly ash replacement ratios of 20%, 30%, and 50% as opposed to using pure cement as a binder. Results also showed a higher corrosion rate for a design of 0% fly ash, mixed with seawater and cured in freshwater compared to other mix designs due to the enclosed chloride contents. Results of this study may be used as future reference on corrosion rate which the findings may be useful in determining the appropriate mix design for structures that require corrosion resistance in different environmental conditions.