Influence of cold joints on the corrosion of steel in concrete mixed with seawater under varying water-cement ratios
Date of Publication
2016
Document Type
Bachelor's Thesis
Degree Name
Bachelor of Science in Civil Engineering with Spec in Construction Technology & Management
College
Gokongwei College of Engineering
Department/Unit
Civil Engineering
Thesis Adviser
Cheryl Lyne C. Roxas
Defense Panel Chair
Jason Maximo C. Ongpeng
Defense Panel Member
Ronaldo S. Gallardo
Lydia Francisca D. Florentino
Abstract/Summary
In the field of construction, there are several factors that affect concrete casting. Unanticipated delays in concrete casting produce cold joints. Cold joints are construction elements that have been proven to give detrimental effects on the overall strength on a concrete structure and allow moisture to seep, thus reaching the reinforced steel.
This study aimed to evaluate the effects of cold joints on the corrosion of steel in concrete mixed and cured with seawater with the incorporation of varying water-cement ratios. A macrocell current density test was done to measure the corrosion rate of steel inside every rectangular specimen having 100x100x200mm dimensions. Three bars, measuring 60mm in length each were contained in every rectangular specimen. All the steel bars had copper wires soldered at each end, which would be connected to the potentiostat. Tests for corrosion rate were done once a week, in a period of eight weeks.
Results showed a direct relationship between the water to cement ratios of the concrete and the corrosion rate. Aside from the varying water to cement ratios, the study showed that seawater increases the corrosion rate when used as curing medium. Cold joints also increased the corrosion rate. The results of the T-test showed that seawater cannot be substituted as a mixing agent for reinforced concrete due to a high significance difference value. Finally, the study concluded that the use of 0.3 water to cement ratio is the best specimen in terms of compressive strength and corrosion resistance.
Abstract Format
html
Language
English
Format
Accession Number
TU18962
Shelf Location
Archives, The Learning Commons, 12F, Henry Sy Sr. Hall
Physical Description
103 leaves : illustrations (some color) ; 30 cm.
Keywords
Joints (Engineering); Steel--Corrosion--Testing; Concrete--Curing
Recommended Citation
Caderao, J., Fernandez, R., Santos, Z., & Toreja, J. (2016). Influence of cold joints on the corrosion of steel in concrete mixed with seawater under varying water-cement ratios. Retrieved from https://animorepository.dlsu.edu.ph/etd_bachelors/8086
