Experimental study on multi-component corrosion inhibitor for steel bar in chloride environment

The present study was initiated with an objective of investigating a plant extract as an effective corrosion inhibitor useful for protection of carbon steel in aqueous environment containing chloride ions. For this purpose, the leaf extract of the plant ‘Aerva lanata’ belonging to Amaranthaceae family of genus Aerva was chosen. The required optimum concentration of the extract for an effective inhibition was found to be 5 %, resulting in the inhibition efficiency of 95 % against corrosion of carbon steel in 200 ppm of NaCl solution. The extract introduced as a corrosion inhibitor was found to be effective in the pH range from 4.0 to 9.0. The extract could retain its inhibition efficiency for about an immersion period of 60 days and also up to a temperature of 333 K. The 5 % extract was found to control corrosion of carbon steel in highly aggressive medium containing 300 ppm of NaCl also. In order to maintain the protective nature, the required concentration of the extract was 2 %. From these studies, it was inferred that the Aerva lanata leaf extract exhibits good inhibitive properties for carbon steel in aqueous environment in wide ranges of pH, temperature and aggressiveness of medium.

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Experimental Study on Seismic Performance of Composite Reinforced Concrete Block Masnory

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.243-249.630 ◽

2011 ◽

Vol 243-249 ◽

pp. 630-635

Author(s):

Ying Jie Zhu ◽

Lan Li ◽

Wen Hui Yang

Keyword(s):

Experimental Study ◽

Reinforced Concrete ◽

Seismic Performance ◽

Failure Process ◽

Concrete Block ◽

Width Ratio ◽

Steel Bar ◽

Core Column ◽

Constructional Column ◽

Hysteresis Characteristics

Seismic performance under low cyclic experimental study on the six of constructional column- core column composite reinforcement concrete block masnory wall is preasented in this paper, considering the height-width ratio, window hole and without window hole, the setting of the horizontal reinforcing steel bar in the walls. Failure process and failure pattern, hysteresis characteristics, bearing capacity, ductility, skeleton curves, the viscous damping coefficient, stiffness and steel strain change the properties are analyzed, respectivily. Test results shown that this kind of composite reinforced concrete block masnory system has better seismic performance.

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Experimental Study on Influence on Structural Mechanical Behavior Caused by Steel Bar Corrosion of Hollow Slab Hinge Joints

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.163-167.1058 ◽

2010 ◽

Vol 163-167 ◽

pp. 1058-1062

Author(s):

Li Ying Peng ◽

Jun Wei ◽

Xia Ban

Keyword(s):

Experimental Study ◽

Theoretical Analysis ◽

Mechanical Behavior ◽

Steel Bar

Through experiment and theoretical analysis, this paper researched the influence of steel bar corrosion of hollow slab hinge joints on the structural mechanical behavior. The results showed that when load was little corrosion of hinge joints steel bar would do little to affect the joint between hollow slabs and hinge joints would work together with hollow slabs as a whole. When load was large, corrosion of hinge joints steel bar would decrease the joint between hollow slabs.

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