Durability characteristics of concrete and reinforcing bars exposed to aggressive environments

Dissertant

Rashid, Farah Hamid

Thesis advisor

Hafiz, Sana Abd al-Hadi

University

University of Technology

Faculty

-

Department

Applied Sciences Department

University Country

Iraq

Degree

Master

Degree Date

2013

English Abstract

Saline pollution attack is an important factor that lead to the deterioration of the concrete, especially in industrial plants, and has numerous studies to determine the effect of saline pollution on the properties of concrete, in order to improve the resistance of concrete to salt solutions.

Although there are many research on the use of different types of chemical additives and mineral production Concrete resistance to salt solution .

In spite of research address the sustainability of concrete and particularly Steel rebar submeserged in it.

Steel rebar is the most important causal factors the deterioration in the reinforced concrete.

The main aim of this study is to effect of additives added to reduce superior degree water and two types of mineral additives that include silica fumes and steel ^ber, as well as the combined effect of these additives on the properties of concrete.

The experimental work of this measure include concrete specimens have been partially submerged in a solution of chlorides and sulfates in concentrations similar to those found in aggressive conditions.

The properties of concrete specimens were evaluated through the slump ^ow tests.

The properties investigated included weight and weight changes test, Bulk Density, total absorption, ultrasound plus velocity, compressive strength electrochemical potential for various types of mixes.

Three mixtures are were used in this study: Reference (RF) ,( SF - SP) content mixed with 10% of silica partial compensation of the weight of cement and 3% by weight of cement of high range water reducing agent and (STF) mix content at 0.5% of the steel ^ber, to investigates the influence surface coating protection on durability properties of concrete be done mix reference coated with natural rubber(RFCNR), and mix container on 0.5% of steel fiber coated with natural rubber (STFCNR).

The electrochemical tests included monitoring the electrode potential and corrosion rates using the rates of rust ,by using Tafel plots for four specimens of rebar metals.

two of them were coated and submerged in two media, one of tap water and the other is salt solution .

The result coated specimens has shown resistance to corrosion greater than specimens without coated when immersion in salt solution.

Thus group (RFCNR ) in the most developed in all properties as compared with all other mixture immersed in salt solution for 150 days at odds with group ( SF-SP) which had development in all properties as compared with the reference mixture at 180 days of immersion in salt solution .

Main Subjects

Natural & Life Sciences (Multidisciplinary)

Topics

• Concrete
• Mechanical properties

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-417670