Effect of curing and partial replacement of coarse aggregates with electric -arc furnace steel slag (EAFS) on flexural strength of concrete

Date

6-2015

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Marish S. Madlangbayan

Abstract

Electric Arc Furnace Steel Slags (EAFS) are the non-metallic wastes produced when scrap metals and fluxes are oxidized using an electric current to produce stainless steel. This typer of slag is mainly used as aggregates in asphalt and road construction,wastewater treatment, and agriculture but not commonly in concrete, unless stabilized first. The presence of quicklime (CaO) and magnesia (MgO) poses as a problem, i.e. expansion occurs within the slag when in contact with water. This reaction depends on the amount of unreacted lime and magnesia and causes an increase in volume, therefore resulting to eventual failure and loss of strength in concrete over time. This research study was conducted to evaluate the flexural strength of concrete with EAFS used as partial replacement for coarse aggregates at two different curing periods, 28-day and 90-day. Results show that after 28 days of curing, the flexural strength of 10%, 20% and 30% replacement are all greater than that of the normal concrete, which is 0% replacement. For the 90-day curing, the flexural strength of only the 10% and 20% are greater than that of the normal concrete. The results also show that as the percent replacement increases, the loss of strength between the two curing periods increase.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2015 E63 /M43

Document Type

Thesis

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