• Proceedings of the Korea Concrete Institute Conference
• /
• 2002.10a
• /
• pp.835-840
• /
• 2002

Chloride ions have a tendency to penetrate into concrete and proceed the corrosion by depassivating rebar surface. Thus tire deteriorated concrete is subject to experience severe degrading of durability under marine environment. In this study, concrete structures exposed to reclaimed marine land wet-e investigate to find out the salt attack along with analysis and review of it's cause. Under the reclaimed marine land, the main causes of deterioration of concrete structures is the steel corrosion due to the Penetration of chlorides and the deterioration of outer concrete itself by chemical attack.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2009.05a
• /
• pp.417-418
• /
• 2009

As iron corrosion by means of penetration of chlorides resulted in a serious deterioration of seaside and landfill concrete construction, it is urgently necessary for seaside construction to acquire watertightness and resistance for chloride-attack. Hence in this study, Si/Al liquor type hybrid-inorganic salt which was very effective compound for improving resistance for chloride-attack applied to mortar and then evaluated resistance for chloride-attack with curing(7, 14, 28, 56 days).

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2022.11a
• /
• pp.117-118
• /
• 2022

High-strength concrete is used for building durability on the coast. It is common to order and produce the concrete from several ready mixed concrete companies. The concrete in Busan was also commissioned by 12 ready mixed concrete companies. The compressive strength and salt diffusion coefficient were measured. The average value and deviation were analyzed.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2012.05a
• /
• pp.91-92
• /
• 2012

RC structure which is located at shoreline has more serious damages compared with inland structure, because it is directly exposed to chlorine ion which is called incoming salt. In the transmission of incoming salt, differences in transmitted volume of incoming salts could occur according to the influences of local shoreline topography which includes surrounding weather conditions, types of building placements, obstacles of wind tunnel etc. And therefore, for the application of boundary conditions for durable offshore structure design against the salt attack, comparative analysis through wind tunnel test and fluid value simulation are executed in order to investigate the moving and adhesion process of incoming salt to offshore structure.

• Magazine of the Korea Concrete Institute
• /
• v.4 no.1
• /
• pp.35-42
• /
• 1992

• Advances in concrete construction
• /
• v.5 no.6
• /
• pp.671-683
• /
• 2017

Commonly used concrete in general, consists of cement, fine aggregate, coarse aggregate and water. Natural river sand is the most commonly used material as fine aggregate in concrete. One of the important requirements of concrete is that it should be durable under certain conditions of exposure. The durability of concrete is defined as its ability to resist weathering action, chemical attack or any other process of deterioration. Durable concrete will retain its original form, quality and serviceability when exposed to its environment. Deterioration can occur in various forms such as alkali aggregate expansion, freeze-thaw expansion, salt scaling by de-icing salts, shrinkage, attack on the reinforcement due to carbonation, sulphate attack on exposure to ground water, sea water attack and corrosion caused by salts. Addition of admixtures may control these effects. In this paper, an attempt has been made to replace part of fine aggregate by tailing material and part of cement by fly ash to improve the durability of concrete. The various durability tests performed were chemical attack tests such as sulphate attack, chloride attack and acid attack test and water absorption test. The concrete blend with 35% Tailing Material (TM) in place of river sand and 20% Fly Ash (FA) in place of OPC, has exhibited higher durability characteristics.

• Proceedings of the Korea Concrete Institute Conference
• /
• 1996.04a
• /
• pp.83-88
• /
• 1996

Reinforced-concrete structures built on the seashore or in seawater are damaged from flying-salt of chloride ion in the seawater. Recently many bridges are being constructed under marine enviornment and there are many serious problems of chlofide attack owing to penetration of chloride ion. And up to now it has not only so little a seatch about damage from flying-salt and seawater but also little systematic study outcome about steel corrosion. In this study we investigate the concrete deterioration and steel corrosion of RC bridges on the seashore. Environmental conditions are investigated, and compressive strength, carbonation depth and steel-corrosion degree are measured.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2010.05a
• /
• pp.207-208
• /
• 2010

The building that supply tidal and splash zone was constructed near Seamangeum Gate Bridge. The specimens that will be tested for maintenance of gate bridge were exposed on the tidal and splash zone, totally about 650. The characteristics of strength, salt penetration profile, field application of surface repair material and section recover material will be acquired by periodical test. The program was developed to obtain optimal maintenance strategy of gate bridge as a marine concrete structure and to deposit experimental data, lab. test result, field test result, on its D/B. On this paper, the comparison of concrete and recover material in the salt penetration characteristics was expressed. The quantitative analysis of salt contents in concrete surface was most important so the improvement for the machine of gathering power of concrete and the apparatus of measuring chloride contents was proceeded at this time. The two conclusions were summarized like as - The resistance of chloride attack of concrete was appeared 2.5 times bigger than that of recover material - The resistance of chloride attack of polymer series was appeared more higher than that of others.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2005.05b
• /
• pp.225-228
• /
• 2005

This paper was accomplished for analyzing the reason of the above deterioration happened on the deck of concrete bridge. The bridge was constructed at 660m above the sea level having more freezing and snowing days. Therefore, it is placed on the particular condition sprinkling $CaCl_2$ enough for keeping up with moderate traffic condition. When it is considered to the former condition, the bridge can be assumed to potentialities for combined deterioration with freezing-thawing under sprinkling deicing chemical. Core specimens were gathered from the concrete deck for clearing the reason of the above deterioration exactly, and it is used for various tests for measuring the compressive strength, elastic modulus, content of $Cl^-$, freezing-thawing at the fresh and salt water. As a result of freezing-thawing test, the specimen at the fresh water has over 90$\%$ of durability factor, but another specimen at 1$\%$ of salt water has 0$\%$ of durability factor at 140 cycles of the freezing-thawing. The result means that frost damage is sccelerated at the salt water. Therefore, the deterioration of the concrete deck is estimated to be occured by combined effects of freezing-thawing and chloride ion attack.

• Magazine of the Korea Concrete Institute
• /
• v.22 no.4
• /
• pp.33-35
• /
• 2010