scholarly journals Incorporation of Silicon Fume and Fly Ash as Partial Replacement of Portland Cement in Reinforced Concrete: Electrochemical study on corrosion behavior of 316LN stainless steel rebar

2020 ◽  
pp. 3740-3749
Author(s):  
Caihong Zhang ◽  
Keyword(s):  
Stainless Steel ◽  
Reinforced Concrete ◽  
Fly Ash ◽  
Portland Cement ◽  
Corrosion Behavior ◽  
Electrochemical Study ◽  
Partial Replacement ◽  
316Ln Stainless Steel ◽  
Steel Rebar

scholarly journals Effect of Silica Fume and Fly Ash Admixtures on the Corrosion Behavior of AISI 304 Embedded in Concrete Exposed in 3.5% NaCl Solution

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4007 ◽  
Author(s):  
Miguel Angel Baltazar-Zamora ◽  
David M. Bastidas ◽  
Griselda Santiago-Hurtado ◽  
José Manuel Mendoza-Rangel ◽  
Citlalli Gaona-Tiburcio ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
Portland Cement ◽  
Silica Fume ◽  
Corrosion Behavior ◽  
Supplementary Cementitious Materials ◽  
304 Stainless Steel ◽  
Corrosion Monitoring ◽  
Aisi 304 ◽  
Concrete Mixtures

The use of supplementary cementitious materials such as fly ash, slag, and silica fume improve reinforced concrete corrosion performance, while decreasing cost and reducing environmental impact compared to ordinary Portland cement. In this study, the corrosion behavior of AISI 1018 carbon steel (CS) and AISI 304 stainless steel (SS) reinforcements was studied for 365 days. Three different concrete mixtures were tested: 100% CPC (composite Portland cement), 80% CPC and 20% silica fume (SF), and 80% CPC and 20% fly ash (FA). The concrete mixtures were designed according to the ACI 211.1 standard. The reinforced concrete specimens were immersed in a 3.5 wt.% NaCl test solution to simulate a marine environment. Corrosion monitoring was evaluated using the corrosion potential (Ecorr) according to ASTM C876 and the linear polarization resistance (LPR) according to ASTM G59. The results show that AISI 304 SS reinforcements yielded the best corrosion behavior, with Ecorr values mainly pertaining to the region of 10% probability of corrosion, and corrosion current density (icorr) values indicating passivity after 105 days of experimentation and low probability of corrosion for the remainder of the test period.

scholarly journals PROPERTIES OF FRESH POLYPROPYLENE FIBRE REINFORCED CONCRETE UNDER THE INFLUENCE OF POZZOLANS

2003 ◽  
Vol 9 (4) ◽  
pp. 271-279 ◽  
Author(s):  
Hau-yan Leung ◽  
Ramapillai V. Balendran
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
Silica Fume ◽  
Setting Time ◽  
Polypropylene Fibre ◽  
Partial Replacement ◽  
Fibre Reinforced Concrete ◽  
Polypropylene Fibres ◽  
Fibre Concrete ◽  
Time Substitution

This paper summarises experimental results of some fresh concrete tests. Polypropylene fibres were added to the concrete mix to produce fibre reinforced concrete. Pozzolanic materials, including pulverised fly ash and silica fume, were used as partial replacement of cement, and their effects on the fresh fibre concrete were reported. Test results showed that the polypropylene fibre reduced the concrete workability significantly by thixotropic effect and decreased the setting time. Substitution of pozzolans also greatly affected the properties. The presence of fly ash increased the workability and setting time but in the presence of silica fume a reverse trend was observed. Empirical equations were proposed.

Use of Thermoplastic Polymer in Mortar Composites to Improve its Chloride Penetration Resistance

2016 ◽  
Vol 22 ◽  
pp. 33-44 ◽  
Author(s):  
M. Omrane ◽  
A.S. Benosman ◽  
M. Mouli ◽  
Y. Senhadji
Keyword(s):  
Reinforced Concrete ◽  
Flexural Strength ◽  
Portland Cement ◽  
Penetration Depth ◽  
Concrete Structures ◽  
Chloride Ion ◽  
Chloride Penetration ◽  
Partial Replacement ◽  
Total Charge ◽  
Reinforced Concrete Structures

This paper presents a study of the resistance to chloride penetration of blended Portland cement mortar containing thermoplastic waste polymer polyethylene terephthalate (TWPET). Composite TWPET-mortars are often presented as the materials of the future in reason of their potential for innovation and advantages that offer. In fact, the use of TWPET percentages as a cement substitution reduces energy costs; address problems related to environmental pollution by CO2 emissions and repairs various reinforced concrete structures. Blended Portland cement (CPJ) is partially replaced with TWPET at the amounts of 2%, 4% and 6% by weight of cementitious materials. Chloride penetration depth of full and partial immersions in 3% NaCl solution, rapid chloride permeability test (RCPT) after 28, 90 and 120 days, sorptivity, leaching test and flexural strength of thermoplastic-mortar composites (TMCs) were determined. Test results reveal that the resistance to chloride penetration of TMCs improves substantially with partial replacement of CPJ with TWPET and without significantly affecting the flexural strength in tap water. The chemical resistance is higher with an increase in the replacement level. So, sorptivity, the chloride ion penetration depth, apparent chloride ion diffusion coefficient, the total charge passed in coulombs and leached depth measurements of the TMCs are much smaller than those of reference mortar. The formations which appear such as different calcium salts were determined by X-ray diffraction. These results take into account the use of waste plastics in the manufacture of mortars modified which can be both recommended for preventing the chloride-induced corrosion of the steel in various reinforced concrete structures and participate greatly in the environment preservation.

Corrosion Behavior and Tensile Properties of AISI 316LN Stainless Steel Exposed to Flowing Sodium at 823 K

2000 ◽  
Vol 9 (1) ◽  
pp. 98-102 ◽  
Author(s):  
S. Rajendran Pillai ◽  
N. Sivai Barasi ◽  
H.S. Khatak ◽  
A.L.E. Terrance ◽  
R.D. Kale ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Tensile Properties ◽  
Corrosion Behavior ◽  
316Ln Stainless Steel
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