Influence of cold joints on the corrosion of steel in concrete mixed with seawater under varying water-cement ratios

Date of Publication


Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Civil Engineering with Spec in Construction Technology & Management


Gokongwei College of Engineering


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


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






Accession Number


Shelf Location

Archives, The Learning Commons, 12F, Henry Sy Sr. Hall

Physical Description

103 leaves : illustrations (some color) ; 30 cm.


Joints (Engineering); Steel--Corrosion--Testing; Concrete--Curing

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