Evaluation of Concrete Permeability by Monitoring Alkali Saturated Conductivity of Concrete Incorporating Mineral Admixtures

Abstract:

Concrete conductivity is the reflection of the micro pore structure and the pore solution conductivity of concrete, but the conductivity of pore solution changes considerably as different mineral admixtures are added, though the change is not always relevant to permeability and Cl- diffusivity. Saturation of concrete capillary pore system with 1 mol/l KOH solution through vacuum processing was tempted to maintain the pore solution conductivity constant, after which the concrete conductivity was a reflection of concrete porosity and tortuousity that closely related to Cl- diffusivity. Charge passed of concrete was also measured for comparison. It is shown that the conductivity of alkali saturated concrete without mineral admixtures was the biggest, followed by the concrete with natural zeolite（20％）, fly ash（30％）, slag（40％）metakaolin 20% and 10% of silica fume.

• Periodical: Key Engineering Materials (Volumes 405-406)
• Pages: 272-277
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.405-406.272
• Online since: January 2009
• Authors: Quan Lin Niu, Nai Qian Feng
• Keywords: Conductivity, Mineral Admixture, Pore Solution

References

[1] AASHTO T259-1996. Standard Method of Test for Resistance of Concrete to Chloride Ion Penetration [S].

[2] C. ANDRADE, D. CERVIGÓN, A. RECUERO, et al. Calculation of Chloride Diffusivity in Concrete from Migration Experiments, In Non-Steady-State conditions [J]. Cement and Concrete Research, 1994, 24(7): 1214-1228.

DOI: 10.1016/0008-8846(94)90106-6

[3] TANG L., L. O. NILSSON. Predication of Chloride Penetration into Concrete By Use the Computer Program CLINCON [A]. Proceeding of 2nd International Conference on Concrete under Severe Condition: environment and loading, CONSEC'98 [C]. Tromso, Norway, 1998. 625-635.

[4] ASTMC1202-94. Electrical Indication of Concrete's Ability To Resist Chloride Ion Penetration [S].

[5] T. SUGIYAMA, Y. TSUJI., T. W. BREMNER. Determination of Chloride Diffusion Coefficient of High Performance Concrete by Electrical Potential Technique [A]. Proceedings Third CANMET/ACI International Conference on Concrete in Marine Environment, SP-163 [C], New Brunswick, Canada, 1996. 339-354.

DOI: 10.14359/1348

[6] AYE AYE KYI. An Electrical Conductive Method For Measuring the Effect of Additive on Effective Diffusivity In Portland Cement Paste [J]. Cement and Concrete Research, 1994, 24 (4): 752-764.

DOI: 10.1016/0008-8846(94)90201-1

[7] P. E. STREICHER, M. G. ALEXANDER. A Chloride Conduction Test for Concrete [J]. Cement and Concrete Research, 1995, 25 (6): 1284-1294.

DOI: 10.1016/0008-8846(95)00121-r

[8] Xinying LU. Application of the Nernst-Einstein equation to concrete [J]. Cem. Concr. Res, 1997, 27(2): 293-302.

[9] WIENS, U.; BREIT, W.; and SCHIESSL, P. Influence of High Silica Fume and High Fly Ash Contents on Alkalinity of Pore Solution and Protection of Steel Again Corrosion [A]. Proceedings of Fifth International Conference on the Use of Fly Ash, Silica Fume, Slag, and Natural Pozzolan in Concrete [C], American Concrete Institute, SP-153, 1995. 741-762.

DOI: 10.14359/1095

[10] Caijun SHI, JULIA A. Stegemann, Robert J. Caldwell. Effect of supplementary cementing materials on the specific conductivity of pore solution and its implication on the rapid chloride permeability test results [J]. ACI material journal, 1998, 95 (4): 389-394.

DOI: 10.14359/381

[11] GU Jiexiang. Zeolite[M]. Building Industry Press. Beijing, 1980. 1-3.

[12] WANG Jian, DONG Jialu, LIU Yang, et al. Studies on the Mechanism of Synthesis of Zeolite 4A from Metakalinite [J]. Chinese journal of inorganic chemistry, 2001, 16(1): 31-36.