Experimental Study on Effective Chloride Diffusion Coefficient of Cement Mortar by Different Electrical Accelerated Measurements
Abstract
:1. Introduction
2. Experimental Program
2.1. Materials and Mixture Proportions
2.2. Sample Preparation
2.3. Effective Chloride Diffusion Test
3. Results and Discussion
3.1. Cumulative Chloride Concentration in the Anode Cell
3.2. Cumulative Chloride Ion Concentration Drop in Cathode Cell
3.3. The Effective Chloride Diffusion Coefficients Comparison
3.4. Chloride Binding Capacity
4. Conclusions
- The steady state diffusion starting time point of NT Build 355 method decreases with the increase of w/c while the Turc method has similar starting time point for different mixture.
- The cumulative chloride concentration drop in the cathode cell showed deviation in first 60 h which will lead to overestimate of the chloride diffusion coefficient for Turc method while the linear regression result after 60 h measurement is very close to NT Build 355 method result.
- The chloride diffusion coefficient and chloride binding capacity of cement mortar increases with the increase of w/c which can be attributed to the higher w/c would result in a porous bulk.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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CaO | SiO2 | Al2O3 | Fe2O3 | MgO | SO3 | K2O | Na2O | LoI | Fineness (m2/kg) |
---|---|---|---|---|---|---|---|---|---|
64.47 | 20.87 | 4.87 | 3.69 | 2.13 | 2.52 | 0.65 | 0.11 | 0.77 | 368.9 |
Mix | w/c | Cement | Mixing Water | Fine Aggregate * | SP (%) | Slump Flow/mm |
---|---|---|---|---|---|---|
A | 0.55 | 615 | 338 | 1230 | 0.00 | 240 |
B | 0.50 | 634 | 317 | 1269 | 0.20 | 230 |
C | 0.45 | 655 | 295 | 1310 | 0.50 | 230 |
D | 0.40 | 678 | 271 | 1355 | 0.70 | 230 |
E | 0.35 | 701 | 245 | 1403 | 1.00 | 190 |
Mix | Linear Regression Equation | R2 |
---|---|---|
A | y = 0.132x − 2.677 | 0.9967 |
B | y = 0.071x − 2.097 | 0.9898 |
C | y = 0.038x − 2.970 | 0.9993 |
D | y = 0.023x − 2.645 | 0.9986 |
E | y = 0.016x − 2.362 | 0.9932 |
Regression Rule | Mix | Linear Regression Equation | R2 |
---|---|---|---|
Rule 1: Starting from 24 h | A | y = 0.139x − 0.430 | 0.9619 |
B | y = 0.076x + 1.190 | 0.9818 | |
C | y = 0.042x + 0.010 | 0.9813 | |
D | y = 0.027x + 1.033 | 0.9661 | |
E | y = 0.018x + 0.106 | 0.9803 | |
Rule 2: Starting from 60 h | A | y = 0.131x + 2.404 | 0.9218 |
B | y = 0.070x + 2.112 | 0.9770 | |
C | y = 0.039x + 0.545 | 0.9838 | |
D | y = 0.021x + 1.391 | 0.9949 | |
E | y = 0.016x + 0.138 | 0.9721 |
Mix | w/c | Da (×10−12 m2/s) | Standard Deviation | Dc1 (×10−12 m2/s) | Standard Deviation | Dc2 (×10−12 m2/s) | Standard Deviation |
---|---|---|---|---|---|---|---|
A | 0.55 | 13.4 | 0.4523 | 14.1 | 0.7465 | 12.3 | 0.7056 |
B | 0.50 | 7.2 | 0.2351 | 7.7 | 0.7512 | 7.1 | 0.6542 |
C | 0.45 | 3.9 | 0.5215 | 4.3 | 0.6545 | 3.9 | 0.4310 |
D | 0.40 | 2.3 | 0.6845 | 2.7 | 0.5896 | 2.1 | 0.1024 |
E | 0.35 | 1.6 | 0.1656 | 1.8 | 0.3458 | 1.7 | 0.1105 |
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Chen, J.; Wang, J.; He, R.; Shu, H.; Fu, C. Experimental Study on Effective Chloride Diffusion Coefficient of Cement Mortar by Different Electrical Accelerated Measurements. Crystals 2021, 11, 240. https://doi.org/10.3390/cryst11030240
Chen J, Wang J, He R, Shu H, Fu C. Experimental Study on Effective Chloride Diffusion Coefficient of Cement Mortar by Different Electrical Accelerated Measurements. Crystals. 2021; 11(3):240. https://doi.org/10.3390/cryst11030240
Chicago/Turabian StyleChen, Jianlan, Jiandong Wang, Rui He, Huaizhu Shu, and Chuanqing Fu. 2021. "Experimental Study on Effective Chloride Diffusion Coefficient of Cement Mortar by Different Electrical Accelerated Measurements" Crystals 11, no. 3: 240. https://doi.org/10.3390/cryst11030240