Influence of Composition on the Corrosion of Steel Bar of Reinforced Geopolymer Concrete

2012 ◽  
Vol 152-154 ◽  
pp. 536-541
Author(s):  
Qing Wang ◽  
Jing Da ◽  
Cun Bao Zhang ◽  
Zhao Yang Ding ◽  
Zhi Tong Sui
Keyword(s):  
Cementitious Material ◽  
Geopolymer Concrete ◽  
Reinforcing Steel ◽  
Carbonation Depth ◽  
Molar Ratios ◽  
Steel Bar ◽  
Small Decline ◽  
Corrosion Of Steel ◽  
Better Than

The three key oxide molar ratios of geopolymer concrete: n(SiO2)/n(Al2O3), n(Na2O)/n(Al2O3) and n(H2O)/n(Na2O) were studied in this paper to determine their effects on reinforced geopolymer concrete by testing the corrosion weightless rates of reinforcing steel bar and carbonation depth. It was found that both of them were decreased first but increased at a certain point with increasing n(SiO2)/n(Al2O3); they showed a downtrend with the increase of n(Na2O)/n(Al2O3). Increasing n(H2O)/n(Na2O) caused an increase in both of them while a small decline was observed in carbonation depth when n(H2O)/n(Na2O)＜28.With the the same amount of cementitious material, resistance to corrosion of steel bar of geopolymer concrete was better than that of common concrete.

Effects of Compositions on the Chloride Ion Permeability of Geopolymer Concrete

2012 ◽  
Vol 450-451 ◽  
pp. 428-432
Author(s):  
Qing Wang ◽  
Jing Da ◽  
Cun Bao Zhang ◽  
Zhao Yang Ding ◽  
Zhi Tong Sui
Keyword(s):  
Chloride Ion ◽  
Cementitious Material ◽  
Molar Ratio ◽  
Geopolymer Concrete ◽  
Ion Permeability ◽  
Flux Method ◽  
Molar Ratios ◽  
Electric Flux ◽  
Better Than

The three key oxide molar ratios of geopolymer concrete were studied in this paper: n(SiO2)/n(Al2O3)，n(Na2O)/n(Al2O3) and n(H2O)/n(Na2O). The effect of each oxide molar ratio was assessed by electric flux method. It was found that resistance to chloride ion of geopolymer was increased with increasing n(SiO2)/n(Al2O3).However, there was a limit beyond which this performance improved; it performed better with the increasing of n(Na2O)/n(Al2O3) but worse with the increasing of n(H2O)/n(Na2O). With the same amount of cementitious material, resistance to chloride ion of geopolymer concrete was better than that of common concrete.

Bond Behavior of Reinforcing Steel Bar and Geopolymer Concrete

2020 ◽  
Vol 32 (7) ◽  
pp. 04020167
Author(s):  
Rakesh Paswan ◽  
Md. Reyazur Rahman ◽  
S. K. Singh ◽  
B. Singh
Keyword(s):  
Geopolymer Concrete ◽  
Reinforcing Steel ◽  
Bond Behavior ◽  
Steel Bar

scholarly journals Proposed simplified method of geopolymer concrete mix design

2020 ◽  
Vol 21 ◽  
pp. 31-37
Author(s):  
Ali Abdulhasan Khalaf ◽  
Katalin Kopecskó
Keyword(s):  
Controlling Factors ◽  
Mix Design ◽  
Alkali Activation ◽  
Geopolymer Concrete ◽  
Molar Ratios ◽  
Concrete Mix Design ◽  
Mix Proportion ◽  
Absolute Volume ◽  
Optimal Mix ◽  
Volume Method

The research aims to determine the best combination of the controlling factors that govern geopolymer concrete’s mechanical and physical properties by utilizing industrial waste. Therefore, a review on the controlling factors was conducted. Firstly, it is to identify the controlling factors, namely chemical composition, alkali activation solution, water content, and curing condition. Secondly, understanding the relationship between these controlling factors and the properties of geopolymer concrete. These factors are analysed to the mix proportion components. Finally, a new proportion method is proposed based on combining ACI 211 standard and recommended molar ratios of oxides involved in geopolymer synthesis. The effect of aggregate has been taken into account by applying the absolute volume method in mix design. Based on the results of the study, it is expected to determine the optimal mix proportions based on multi-responses.

scholarly journals Effects of the corrosion of main bar and stirrups on the bond behavior of reinforcing steel bar

2019 ◽  
Vol 225 ◽  
pp. 13-28 ◽  
Author(s):  
Hongwei Lin ◽  
Yuxi Zhao ◽  
Jia-Qi Yang ◽  
Peng Feng ◽  
Josko Ozbolt ◽  
...  
Keyword(s):  
Reinforcing Steel ◽  
Bond Behavior ◽  
Steel Bar

All-Solid-State Reference Electrode Based on Polymer Composites for Corrosion Monitoring of Steel in Concrete

2010 ◽  
Vol 163-167 ◽  
pp. 2945-2948
Author(s):  
Li Juan Kong ◽  
Tong Zhang ◽  
Guang Pin Song
Keyword(s):  
Solid State ◽  
Civil Engineering ◽  
Reference Electrode ◽  
Steel Corrosion ◽  
Steel Structures ◽  
Electrode System ◽  
Corrosion Monitoring ◽  
Steel Bar ◽  
State Reference ◽  
Corrosion Of Steel

Corrosion of steel structures has been found to be a problem Corrosion can be managed but not eliminated, so detecting corrosion will remain an issue no matter how effective corrosion prevention programs become. Electrochemical reaction is the basically process of steel corrosion in civil engineering, so electrochemical method is the best way to monitor corrosion grade. Liquid state reference is often used in lab to study steel corrosion by triple electrode system, but it is very difficultly used in steel bar corrosion monitoring in civil engineering. Firstly, liquid reference’s life is, generally speaking, very short. The steel corrosion is a very slow process, corrosion monitoring should be tens of years, so the liquid reference’s life is not long enough for corrosion monitoring; Secondly, the reference electrode’s strength have to be very high. Obviously, liquid electrode reference can not meet the requirement. In this paper, a novel all solid state reference electrode (ASSRE) has been developed. There are three layers in the electrode. Four kinds of components have been included in first and second layer. Additional AgCl powder has been used to inhibit AgCl decrease which is on the surface of Ag wire by complexing effect. There is only one kind of component in third layer. There are four steps to prepare the reference electrode: electrolyze, pre-mixed components, modelling and sintering. Finally, the potential of ASSR has been measured by SCE.

Effects of Ceramsite Concrete Strength on Natural Frequency Based on ANSYS

2012 ◽  
Vol 204-208 ◽  
pp. 4124-4127
Author(s):  
Hao Qing Wang ◽  
Qiu Kong ◽  
Zhou Ping Yu ◽  
Wei Jun Yang
Keyword(s):  
Natural Frequency ◽  
Seismic Design ◽  
Vibration Frequency ◽  
Concrete Strength ◽  
Reinforcing Steel ◽  
Material Parameters ◽  
Modeling Analysis ◽  
Steel Bar ◽  
Environmental Vibration

By separate modeling analysis based upon ANSYS, SOLID65 unit of the entity is selected to simulate ceramsite concrete, and reinforcing performance is selected to simulate the effect of reinforcing steel bar. The strength on natural frequency’s effects was studied through changing the ansys model’s material parameters of ceramsite concrete. The strength of ceramsite concrete can be determined and applied to the anti-seismic design according to the size of the environmental vibration frequency.

Experiment study on chloride corrosion deterioration of load-bearing concrete segment

2018 ◽  
Vol 22 (4) ◽  
pp. 960-970 ◽  
Author(s):  
Kun Feng ◽  
Sijin Liu ◽  
Chuan He ◽  
Zuzhao Peng ◽  
Chao Gou ◽  
...  
Keyword(s):  
External Load ◽  
Loss Rate ◽  
Failure Pattern ◽  
Shield Tunnel ◽  
Change Rate ◽  
Load Bearing ◽  
Steel Bar ◽  
Bending Load ◽  
Corrosion Of Steel ◽  
Steel Section

In order to study the combined action of compression-bending load and surrounding ion erosive environment on underwater shield tunnel, a series of cofferdam-type electrochemical-accelerated corrosion tests of mini segments are carried out to investigate the segment reinforcement corrosion under different compression-bending loads and the change of internal force and rigidity of mini segments under different load-bearing and corroding conditions. Then, the failure pattern of mini segments under different loading and corroding states are recorded and analyzed. The results indicate that the following: (1) the larger the external load, the shorter the initial rust time of the steel bar; (2) the corrosion rate of steel bar increases linearly with time, and the ratio of corrosion of steel bar increases quadratically with time, the larger the load, the more obvious the increase will be; (3) after the corrosion of steel bar, the change rate of the strain for the steel bar increases as the external load augments, and as a matter of fact, the change rate of the strain increases as well, besides, the degree of strain change for compressive steel is obviously lower compared with that of tensile steel bar; (4) the effect of electric corrosion on the deflection of the segments is more obvious with the increase of external load, and a quadratic increase relationship between the deflection and the corrosion is observed in the process of corrosion; (5) It can be concluded that plastic failure is observed for the segments without loading and for those without cracks in the initial stage of loading, which can be indicated directly by the relatively smaller loss rate of steel section, while brittle failure is presented as the failure pattern for the segments with cracks after loading for certain period, which means the loss rate of steel section is relatively larger. The results can briefly provide useful reference for rational design and durability assessment of shield tunnel segmental linings.

Sign in / Sign up

Export Citation Format

Share Document