Fahad Al-Mutlaq

Corrosion of reinforcing steel is recognized to be the major cause of deterioration of concrete structures in many parts of the world and the costs of dealing with it have been estimated to run to many billions of dollars annually. While steel is normally protected from corrosion in concrete by a passive film of oxide stabilized by the alkalinity of the cement matrix this protection can break down if the depth of

In construction industry worldwide, there is an increasing tendency towards using cements blended with industrial by/waste products such as fly ash, silica fume and blast furnace slag in concrete. Extensive field and laboratory research studies conducted in the past three ...

©2008 by NACE International. Requests for permission to publish this manuscript in any form, in part or in whole must be in writing to NACE International, Copyright Division, 1440 South creek Drive, Houston, Texas 777084. The material presented and the views expressed in ...

Electric arc furnace dust (EAFD) is a by-product of the electric steelmaking industry produced in large quantities around the world. In Saudi Arabia, a form of EAFD known as Bag House Dust (BHD) is being used in small amounts as concrete additive, because higher levels of addition caused excessive retardation of setting and hardening. The use of this material is recent, therefore little is known about its effects on durability. This research aims to examine effects of BHD additions on certain properties of cement pastes, mortars and concretes, particularly those believed to affect the susceptibility of embedded steel reinforcement to chloride-induced corrosion as this is a major cause of degradation of reinforced concrete structures in the Arabian Gulf region. Studies of the effects of 2 % BHD addition on pore solution chemistry of hydrated-cement pastes with various levels of internal chloride contamination indicated that both free chloride concentration and hydroxyl ion concentrat...

In a petrochemical plant, two reinforced concrete seawater structures were constructed with built in cathodic prevention (CP) systems to prevent corrosion of the steel reinforcement from day one. The anode system consisted of mixed metal oxide coated titanium mesh ribbon and ...

In construction industry worldwide, there is an increasing tendency towards using cements blended with industrial by/waste products such as fly ash, silica fume and blast furnace slag in concrete. Extensive field and laboratory research studies conducted in the past three ...

The petrochemical plants in Arabian Gulf use seawater to remove exothermic heat generated in the reactors. In each plant, seawater is stored in large reinforced concrete reservoirs that provide cooling system to the plant. Most of these plants came on-stream in early 1980s. After ...

©2008 by NACE International. Requests for permission to publish this manuscript in any form, in part or in whole must be in writing to NACE International, Copyright Division, 1440 South creek Drive, Houston, Texas 777084. The material presented and the views expressed in ...

The incorporation of electric arc furnace dust into concrete at substantial levels of addition is known to be associated with excessive retardation of cement hydration owing to the presence of high levels of zinc and other heavy metals in the material. The research described herein was aimed at evaluating the potential for counteracting this by controlled addition of chloride-free accelerating admixtures to concrete containing electric arc furnace dust. Calcium nitrite and calcium formate were both found to be effective in accelerating the hardening process but ineffective in reducing the setting time. They were also found to improve the workability of concrete containing a substantial level of electric arc furnace dust. The role of the accelerators as a means of countering the effect of electric arc furnace dust in delaying formation of portlandite and other cement hydration products was elucidated by thermal analysis techniques.