Title:
Characteristics and Chloride Permeability of Internally Cured Concrete
Author(s):
Yail J. Kim, Jun Wang, and Yongcheng Ji
Publication:
Materials Journal
Volume:
115
Issue:
1
Appears on pages(s):
139-147
Keywords:
chloride; internal curing; material characterization; performance.
DOI:
10.14359/51701098
Date:
1/1/2018
Abstract:
This paper presents an experimental study on the physical characteristics of internally cured concrete using organic and inorganic materials, including chloride-related responses. The curing agents saturated before mixing the concrete are microporous lightweight aggregate (LWA), crushed returned concrete aggregate (CCA), and superabsorbent polymer (SAP). The inorganic agents (LWA and CCA) replace the concrete’s fine aggregate by 25 to 75% in mass, while the organic agent (SAP) is added to the concrete mixture by 0.2 to 0.6% of the cement mass. A variety of test schemes are employed—namely, compression strength, resonant frequency, drying shrinkage, chloride permeability, and digital microscopy. Selected specimens are preloaded to examine the performance of the internally cured concrete subjected to service loading. The compressive strength of the concrete decreases as the amount of the curing agents increases. The strength decrease rate of the LWA and SAP-mixed concrete is more rapid than that of the CCA-mixed concrete. In terms of resonant frequency, the LWA-mixed concrete is more susceptible relative to its CCA and SAP counterparts because of the LWA’s microporous structure. The concrete mixed with LWA reveals dynamic to static elastic modulus ratios higher than the concrete with the other agents. Although all concrete mixtures’ drying shrinkage is influenced by the agents’ quantity, the inclusion of SAP results in more shrinkage. Electric charges passed through the internally cured concrete are higher than those of the control concrete, which represent the degree of chloride permeability. The occurrence of cracks in the concrete caused by preloading accelerates the mobility of chloride ions; nonetheless, the addition of SAP alleviates the implications of the mechanical damage.
Related References:
1. Aitcin, P. C., “The Durability Characteristics of High Performance Concrete: A Review,” Cement and Concrete Composites, V. 25, No. 4-5, 2003, pp. 409-420. doi: 10.1016/S0958-9465(02)00081-1
2. Reynolds, D.; Browning, J.; and Darwin, D., “Lightweight Aggregates as an Internal Curing Agent for Low-Cracking High-Performance Concretes,” Structural Engineering and Engineering Materials, SM Report No. 97, V. 142, 2009.
3. Bentz, D. P.; Halleck, P. M.; Grader, A. S.; and Roberts, J. W., “Water Movement during Internal Curing,” Concrete International, V. 28, No. 10, Oct. 2006, pp. 39-45.
4. Craeye, B.; Geirnaert, M.; and Schutter, G. D., “Superabsorbing Polymers as an Internal Curing Agent for Mitigation of Early-Age Cracking of High-Performance Concrete Bridge Decks,” Construction and Building Materials, V. 25, No. 1, 2011, pp. 1-13. doi: 10.1016/j.conbuildmat.2010.06.063
5. Gesoglu, M.; Guneyisi, E.; Ismael, A. N. I.; and Oz, H. O., “Internal Curing of High-Strength Concretes Using Artificial Aggregates as Water Reservoirs,” ACI Materials Journal, V. 112, No. 6, Nov.-Dec. 2015, pp. 809-819. doi: 10.14359/51687904
6. Kim, H. K., and Lee, H. K., “Autogenous Shrinkage Reduction with Untreated Coal Bottom Ash for High-Strength Concrete,” ACI Materials Journal, V. 113, No. 3, May-June 2016, pp. 277-285. doi: 10.14359/51688700
7. Castro, J.; Keiser, L.; Golias, M.; and Weiss, J., “Absorption and Desorption Properties of Fine Lightweight Aggregate for Application to Internally Cured Concrete Mixtures,” Cement and Concrete Composites, V. 33, No. 10, 2011, pp. 1001-1008. doi: 10.1016/j.cemconcomp.2011.07.006
8. Kim, H., and Bentz, D., “Internal Curing with Crushed Returned Concrete Aggregates for High Performance Concrete,” Concrete Technology Forum: Focus on Sustainable Development, National Ready Mixed Concrete Association, College Park, MD, 2008, 12 pp. (CD-ROM)
9. M2 Polymer, “Material Data Sheet,” Waste Lock, V. 770, Polymer Technologies, Inc., West Dundee, IL, 2009, p. M2.
10. ASTM C39, “Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens,” ASTM International, West Conshohocken, PA, 2016.
11. ASTM C215-14, “Standard Test Method for Fundamental Transverse, Longitudinal, and Torsional Resonant Frequencies of Concrete Specimens,” ASTM International, West Conshohocken, PA, 2014.
12. ASTM C157, “Standard Test Method for Length Change of Hardened Hydraulic-Cement Mortar and Concrete,” ASTM International, West Conshohocken, PA, 2008.
13. ASTM C1202-12, “Standard Test Method for Electrical Indication pf Concrete’s Ability to Resist Chloride Ion Penetration,” ASTM International, West Conshohocken, PA, 2012, 8 pp.
14. Aydin, E., and Doven, A. G., “Influence of Water Content on the Ultrasonic Pulse Echo Measurements through High Volume Fly Ash Cement Paste—Physicomechanical Characterization,” Research in Nondestructive Evaluation, V. 17, No. 4, 2006, pp. 177-189. doi: 10.1080/09349840600788004
15. Mashinsky, E. I., “Differences between Static and Dynamic Elastic Moduli of Rocks: Physical Causes,” Russian Geology and Geophysics, V. 44, No. 9, 2003, pp. 953-959.
16. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14),” American Concrete Institute, Farmington Hills, MI, 2014, 519 pp.
17. Neville, A. M., Properties of Concrete, fourth edition, Pearson, Prentice Hall, Essex, UK, 1995.
18. Ayano, T., and Wittmann, F. H., “Drying, Moisture Distribution, and Shrinkage of Cement-Based Materials,” Materials and Structures, V. 35, No. 3, 2002, pp. 134-140. doi: 10.1007/BF02533581
19. Slate, F. O., and Hover, K. C., Microcracking in Concrete, Fracture Mechanics of Concrete: Material Characterization and Testing, 1984, 137-158.
20. Attiogbe, E. K., and Darwin, D., “Submicrocracking in Cement Paste And Mortar,” ACI Materials Journal, V. 84, No. 6, Nov.-Dec. 1987, pp. 491-500.
21. Joshi, P., and Chan, C., “Rapid Chloride Permeability Testing,” Concrete Construction, 2002, 5 pp.