Evaluating the Use of Accelerated Test Methods for Chloride Transport in Alkali Activated Slag Concretes Using Electrical Impedance and Associated Models

2013 ◽  
pp. 85-107 ◽  
Author(s):  
Narayanan Neithalath ◽  
Deepak Ravikumar
Keyword(s):  
Electrical Impedance ◽  
Chloride Transport ◽  
Test Methods ◽  
Accelerated Test ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated

scholarly journals Alkali-Activated Slag/ Fly Ash Concrete: Mechanism, Properties, Hydration Product and Curing Temperature

2020 ◽  
Vol 9 (9) ◽  
pp. 204-215
Keyword(s):  
Fly Ash ◽  
Hydration Product ◽  
Test Methods ◽  
Curing Temperature ◽  
Environmental Friendliness ◽  
Alkali Activated Slag ◽  
Fly Ash Concrete ◽  
Activated Slag ◽  
Alkali Activated Concrete ◽  
Alkali Activated

Alkali-activated concrete (AAC) is mounting as a feasible alternative to OPC assimilated to reduce greenhouse gas emanated during the production of OPC. Use of pozzolana results in gel over-strengthening and fabricate less quantity of Ca(OH)2 which provide confrontation to concrete against hostile environment. (AAC) is potential due to inheriting the property of disbursing CO2 instantly from the composition. Contrastingly an option to ordinary Portland cement (OPC), keeping this fact in mind the goal to evacuate CO2 emits and beneficiate industrial by-products into building material have been taken into consideration. Production of alkali-activated cement emanates CO2 nearly 50-80% less than OPC. This paper is the general assessment of current report on the fresh and hardened properties of alkali-activated fly ash (AAF), alkali-activated slag (AAS), and alkali activated slag and fly ash (AASF) concrete. In the recent epoch, there has been a progression to blend slag with fly ash to fabricate ambient cured alkali-activated concrete. Along with that the factors like environmental friendliness, advanced studies and investigation are also mandatorily required on the alkali activated slag and fly ash concrete. In this way, the slag to fly ash proportion impacts the essential properties and practical design of AAC. This discusses and reports the issue in an intensive manner in the following sections. This will entail providing a good considerate of the following virtues like workability, compressive strength, tensile strength, durability issues, ambient and elevated-temperature curing of AAC which will improve further investigation to elaborate the correct test methods and to commercialize it.

Investigation on Electrical Resistance of Chloride Penetration of Alkali Activated Slag Concrete

2021 ◽  
Vol 1036 ◽  
pp. 378-385
Author(s):  
Teng Wang ◽  
Xiao Mei Wan ◽  
Qi Yu ◽  
Zhong Tao Sun ◽  
Xiao Han
Keyword(s):  
Current Method ◽  
Test Methods ◽  
Chloride Penetration ◽  
Test Method ◽  
Electrical Parameters ◽  
Alkali Activated Slag ◽  
Chloride Migration ◽  
Electric Flux ◽  
Activated Slag ◽  
Alkali Activated

Alternating-current method for measuring chloride penetration resistance of concrete, test method for coulomb electric flux and rapid chloride migration coefficient (RCM) were applied to evaluate the resistance of chloride penetration in alkali-activated slag concrete in this paper. At the same time, the applicability of the above three electrical parameters test methods to the alkali slag concrete was discussed. The results show that NaOH activated slag concrete behaves higher resistance to chloride penetration than water glass activated slag concrete. Blend of fly ash increases the porosity of alkali-activated slag concrete and weakens the resistance of chloride penetration. Correlation coefficient between chloride migration coefficient and AC electrical resistivity is 0.99. There are good correlations among the evaluation results of three electrical parameters test methods, and all of them behave sound applicability to alkali-activated slag concrete.

scholarly journals Resistance of Alkali-Activated Slag Concrete to Chloride-Induced Corrosion

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Joon Woo Park ◽  
Ki Yong Ann ◽  
Chang-Geun Cho
Keyword(s):  
Portland Cement ◽  
Chloride Transport ◽  
Binding Capacity ◽  
Chloride Ions ◽  
Chloride Penetration ◽  
Half Cell ◽  
Cell Potential ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated

The corrosion resistance of steel in alkali-activated slag (AAS) mortar was evaluated by a monitoring of the galvanic current and half-cell potential with time against a chloride-contaminated environment. For chloride transport, rapid chloride penetration test was performed, and chloride binding capacity of AAS was evaluated at a given chloride. The mortar/paste specimens were manufactured with ground granulated blast-furnace slag, instead of Portland cement, and alkali activators were added in mixing water, including Ca(OH)2, KOH and NaOH, to activate hydration process. As a result, it was found that the corrosion behavior was strongly dependent on the type of alkali activator: the AAS containing the Ca(OH)2activator was the most passive in monitoring of the galvanic corrosion and half-cell potential, while KOH, and NaOH activators indicated a similar level of corrosion to Portland cement mortar (control). Despite a lower binding of chloride ions in the paste, the AAS had quite a higher resistance to chloride transport in rapid chloride penetration, presumably due to the lower level of capillary pores, which was ensured by the pore distribution of AAS mortar in mercury intrusion porosimetry.

scholarly journals Chloride transport and the resulting corrosion of steel bars in alkali activated slag concretes

2015 ◽  
Vol 49 (9) ◽  
pp. 3663-3677 ◽  
Author(s):  
Qianmin Ma ◽  
Sreejith V. Nanukuttan ◽  
P. A. Muhammed Basheer ◽  
Yun Bai ◽  
Changhui Yang
Keyword(s):  
Chloride Transport ◽  
Alkali Activated Slag ◽  
Steel Bars ◽  
Activated Slag ◽  
Corrosion Of Steel ◽  
Alkali Activated

Research Progress on Carbonation Resistance of Alkali-Activated Slag Cement Concrete

2021 ◽  
Vol 1036 ◽  
pp. 347-357
Author(s):  
Lan Fang Zhang ◽  
Liu Yang ◽  
Bin Hong Fu ◽  
Yu Yue
Keyword(s):  
Influencing Factors ◽  
Test Methods ◽  
Research Progress ◽  
Cement Concrete ◽  
Slag Cement ◽  
Alkali Activated Slag ◽  
Carbonation Process ◽  
Carbonation Resistance ◽  
Activated Slag ◽  
Alkali Activated

The carbonation process in alkali-activated slag cement concrete is more complicated. This paper reviews the research progress of carbonation resistance of alkali-activated slag cement concrete at home and abroad and summarizes the existing research on carbonation. The focus is on the carbonation mechanism, test methods, influencing factors and the effect of carbonation on the performance of alkali-activated slag cement concrete. The problems existing in the current research on the anti-carbonation property of alkali-activated slag cement concrete and the issues for further research are proposed.

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