Title:
Cracking Control of Mass Concrete Slab in Nuclear Power Plant with Dynamic Curing
Author(s):
Zhang Xingbin, Rong Hua, Zhang Zhong, Fang Sha, and Geng Yan
Publication:
Materials Journal
Volume:
119
Issue:
3
Appears on pages(s):
39-52
Keywords:
active thermal stress control; cracking control; dynamic curing; elastic strain monitoring; mass concrete slab
DOI:
10.14359/51734602
Date:
5/1/2022
Abstract:
To control cracking of mass concrete slabs in nuclear power plants (NPPs), a dynamic curing technique is proposed based on the stress superposition principle and elastic assumptions. It optimizes the stress field through targeted regulation of temperature variation according to the measured elastic strain εem by flexible application of surface-protection techniques. The limit tensile strain of εem is defined as 120 με to guarantee no cracks would occur. In its application on two slabs, only one hairline vertical crack was observed when εem reached 130 με on the 12th day after casting. However, the tensile strain gradually decreased, and the crack tended to close with age. The presented technique has been verified on more than 20 NPPs throughout the continuous casting stage (and even the operation period), saving construction time in the meantime. In addition, it provides theoretical and technical guidance for further investigation of mass concrete with complicated cross-section shapes.
Related References:
1. Kanavaris, F.; Jędrzejewska, A.; Sfikas, I. P.; Schlicke, D.; Kuperman, S.; Šmilauer, V.; Honório, T.; Fairbairn, E. M. R.; Valentim, G.; Funchal de Faria, E.; and Azenha, M., “Enhanced Massivity Index Based on Evidence from Case Studies: Towards a Robust Pre-Design Assessment of Early-Age Thermal Cracking Risk and Practical Recommendations,” Construction and Building Materials, V. 271, Feb. 2021, Article No. 121570. doi: 10.1016/j.conbuildmat.2020.121570
2. ACI Committee 207, “Guide to Mass Concrete (ACI 207.1R-05) (Reapproved 2012),” American Concrete Institute, Farmington Hills, MI, 2006, 30 pp.
3. Fairbairn, E. M. R., and Azenha, M., eds., Thermal Cracking of Massive Concrete Structures: State of the Art Report of the RILEM Technical Committee 254-CMS, Springer, Cham, Switzerland, 2019, 409 pp.
4. ACI Committee 207, “Cooling and Insulating Systems for Mass Concrete (ACI 207.4R-05) (Reapproved 2012),” American Concrete Institute, Farmington Hills, MI, 2005, 15 pp.
5. Zhu, B., Thermal Stresses and Temperature Control of Mass Concrete, Butterworth-Heinemann, Oxford, UK, 2014, 518 pp.
6. Pai, B. H. V.; Nandy, M.; Krishnamoorthy, A.; Sarkar, P. K.; and Ganapathy, C. P., “Experimental Study on Self-Compacting Concrete Containing Industrial By-Products,” European Scientific Journal, V. 10, No. 12, Apr. 2014, pp. 292-300.
7. Kim, B. J., and Yi, C., “Experimental Study on the Shrinkage Properties and Cracking Potential of High Strength Concrete Containing Industrial By-Products for Nuclear Power Plant Concrete,” Nuclear Engineering and Technology, V. 49, No. 1, Feb. 2017, pp. 224-233. doi: 10.1016/j.net.2016.07.007
8. Nair, H., and Ozyildirim, H. C., “Lightweight Aggregates and Shrinkage-Reducing Admixtures for Low-Cracking Concrete,” ACI Materials Journal, V. 116, No. 5, Sept. 2019, pp. 91-98. doi: 10.14359/51716830
9. Silfwerbrand, J. L., and Farhang, A. A., “Reducing Crack Risk in Industrial Concrete Floors,” ACI Materials Journal, V. 111, No. 6, Nov.-Dec. 2014, pp. 681-689. doi: 10.14359/51686833
10. Liu, F.; Shen, S.-L.; Hou, D.-W.; Arulrajah, A.; and Horpibulsuk, S., “Enhancing Behavior of Large Volume Underground Concrete Structure Using Expansive Agents,” Construction and Building Materials, V. 114, July 2016, pp. 49-55. doi: 10.1016/j.conbuildmat.2016.03.075
11. Pan, Z.; Zhu, Y.; Zhang, D.; Chen, N.; Yang, Y.; and Cai, X., “Effect of Expansive Agents on the Workability, Crack Resistance and Durability of Shrinkage-Compensating Concrete with Low Contents of Fibers,” Construction and Building Materials, V. 259, Oct. 2020, Article No. 119768. doi: 10.1016/j.conbuildmat.2020.119768
12. Ma, R.; Guo, L.; Ye, S.; Sun, W.; and Liu, J., “Influence of Hybrid Fiber Reinforcement on Mechanical Properties and Autogenous Shrinkage of an Ecological UHPFRCC,” Journal of Materials in Civil Engineering, ASCE, V. 31, No. 5, May 2019, p. 04019032. doi: 10.1061/(ASCE)MT.1943-5533.0002650
13. Yang, L.; Shi, C.; and Wu, Z., “Mitigation Techniques for Autogenous Shrinkage of Ultra-High-Performance Concrete - A Review,” Composites Part B: Engineering, V. 178, Dec. 2019, Article No. 107456. doi: 10.1016/j.compositesb.2019.107456
14. ACI Committee 305, “Guide to Hot Weather Concreting (ACI 305R-10),” American Concrete Institute, Farmington Hills, MI, 2010, 23 pp.
15. Cao, Z.; Su, S.; and Gu, S., “Methods for Preventing Structural Cracks in Mass Concrete Pouring for Subway Construction,” International Conference on Civil Engineering and Urban Planning, Yantai, China, Aug. 2012, pp. 382-386.
16. Singh, P. R., and Rai, D. C., “Effect of Piped Water Cooling on Thermal Stress in Mass Concrete at Early Ages,” Journal of Engineering Mechanics, ASCE, V. 144, No. 3, Mar. 2018, p. 04017183. doi: 10.1061/(ASCE)EM.1943-7889.0001418
17. Azenha, M.; Lameiras, R.; de Sousa, C.; and Barros, J., “Application of Air Cooled Pipes for Reduction of Early Age Cracking Risk in a Massive RC Wall,” Engineering Structures, V. 62-63, Mar. 2014, pp. 148-163. doi: 10.1016/j.engstruct.2014.01.018
18. Liu, W.; Cao, W.; Yan, H.; Ye, T.; and Jia, W., “Experimental and Numerical Studies of Controlling Thermal Cracks in Mass Concrete Foundation by Circulating Water,” Applied Sciences, V. 6, No. 4, Apr. 2016, Article No. 110. doi: 10.3390/app6040110
19. Ha, J.-H.; Jung, Y. S.; and Cho, Y.-G., “Thermal Crack Control in Mass Concrete Structure Using an Automated Curing System,” Automation in Construction, V. 45, Sept. 2014, pp. 16-24. doi: 10.1016/j.autcon.2014.04.014
20. Jędrzejewska, A.; Benboudjema, F.; Lacarrière, L.; Azenha, M.; Schlicke, D.; Dal Pont, S.; Delaplace, A.; Granja, J.; Hájková, K.; Heinrich, P. J.; Sciumè, G.; Strieder, E.; Stierschneider, E.; Šmilauer, V.; and Troyan, V., “COST TU1404 Benchmark on Macroscopic Modelling of Concrete and Concrete Structures at Early Age: Proof-of-Concept Stage,” Construction and Building Materials, V. 174, June 2018, pp. 173-189. doi: 10.1016/j.conbuildmat.2018.04.088
21. ACI Committee 207, “Report on Thermal and Volume Change Effects on Cracking of Mass Concrete (ACI 207.2R-07),” American Concrete Institute, Farmington Hills, MI, 2007, 28 pp.
22. Weiss, W. J.; Yang, W.; and Shah, S. P., “Shrinkage Cracking of Restrained Concrete Slabs,” Journal of Engineering Mechanics, ASCE, V. 124, No. 7, July 1998, pp. 765-774. doi: 10.1061/(ASCE)0733-9399(1998)124:7(765)
23. Barcelo, L.; Moranville, M.; and Clavaud, B., “Autogenous Shrinkage of Concrete: A Balance between Autogenous Swelling and Self-Desiccation,” Cement and Concrete Research, V. 35, No. 1, Jan. 2005, pp. 177-183. doi: 10.1016/j.cemconres.2004.05.050
24. Zhang, J.; Hou, D.; and Gao, Y., “Calculation of Shrinkage Stress in Early-Age Concrete Pavements. I: Calculation of Shrinkage Strain,” Journal of Transportation Engineering, ASCE, V. 139, No. 10, Oct. 2013, pp. 961-970. doi: 10.1061/(ASCE)TE.1943-5436.0000509
25. Zhang, J.; Hou, D.; and Gao, Y., “Calculation of Shrinkage Stress in Early-Age Concrete Pavements. II: Calculation of Shrinkage Stress,” Journal of Transportation Engineering, ASCE, V. 139, No. 10, Oct. 2013, pp. 971-980. doi: 10.1061/(ASCE)TE.1943-5436.0000582
26. Yang, W.; Weiss, W. J.; and Shah, S. P., “Predicting Shrinkage Stress Field in Concrete Slab on Elastic Subgrade,” Journal of Engineering Mechanics, ASCE, V. 126, No. 1, Jan. 2000, pp. 35-42. doi: 10.1061/(ASCE)0733-9399(2000)126:1(35)
27. Shah, S. P.; Ouyang, C.; Marikunte, S.; Yang, W.; and Becq-Giradoun, E., “A Method to Predict Shrinkage Cracking of Concrete,” ACI Materials Journal, V. 95, No. 4, July-Aug. 1998, pp. 339-346.
28. Chen, H.-J.; Peng, H.-S.; and Chen, Y.-F., “Numerical Analysis of Shrinkage Stresses in a Mass Concrete,” Journal of the Chinese Institute of Engineers, V. 27, No. 3, 2004, pp. 357-365. doi: 10.1080/02533839.2004.9670882
29. ACI Committee 209, “Prediction of Creep, Shrinkage, and Temperature Effects in Concrete Structures (ACI 209R-92) (Reapproved 2008),” American Concrete Institute, Farmington Hills, MI, 1992, 47 pp.
30. CEB-FIP, “CEB-FIP Model Code 1990,” Final Draft, CEB Bulletin D’Information No. 203, Comité Euro-International du Béton, Lausanne, Switzerland, 1991.
31. Young, W. C., and Budynas, R. G., Roark’s Formulas for Stress and Strain, seventh edition, McGraw-Hill, New York, 2002, 854 pp.
32. Swaddiwudhipong, S.; Lu, H.-R.; and Wee, T.-H., “Direct Tension Test and Tensile Strain Capacity of Concrete at Early Age,” Cement and Concrete Research, V. 33, No. 12, Dec. 2003, pp. 2077-2084. doi: 10.1016/S0008-8846(03)00231-X
33. Nguyen, D. H.; Dao, V. T. N.; and Lura, P., “Tensile Properties of Concrete at Very Early Ages,” Construction and Building Materials, V. 134, Mar. 2017, pp. 563-573. doi: 10.1016/j.conbuildmat.2016.12.169
34. Bamforth, P. B., “Early-Age Thermal Crack Control in Concrete (CIRIA C660),” CIRIA, London, UK, 2007.
35. Iskhakov, I., and Ribakov, Y., “Structural Phenomenon Based Theoretical Model of Concrete Tensile Behavior at Different Stress-Strain Conditions,” Journal of Building Engineering, V. 33, Jan. 2021, Article No. 101594. doi: 10.1016/j.jobe.2020.101594
36. Hattel, J. H., and Thorborg, J., “A Numerical Model for Predicting the Thermomechanical Conditions During Hydration of Early-Age Concrete,” Applied Mathematical Modelling, V. 27, No. 1, Jan. 2003, pp. 1-26. doi: 10.1016/S0307-904X(02)00082-3
37. Geng, Y.; Li, X.; Xue, S.; Li, J.; and Song, Y., “Experimental and Theoretical Internal Forced Convection Investigation on Air Pipe Cooling of Large-Dimension RC Walls,” Construction and Building Materials, V. 194, Jan. 2019, pp. 161-170. doi: 10.1016/j.conbuildmat.2018.10.177
38. Yun, Y.-W.; Jang, I.-Y.; and Wang, W.-W., “Early-Age Autogenous Shrinkage of High-Performance Concrete Columns by Embedded Fiber Bragg-Grating Sensor,” KSCE Journal of Civil Engineering, V. 16, No. 6, Sept. 2012, pp. 967-973. doi: 10.1007/s12205-012-0811-6
39. Song, C.; Hong, G.; and Choi, S., “Modeling Autogenous Shrinkage of Hydrating Cement Paste by Estimating the Meniscus Radius,” Construction and Building Materials, V. 257, Oct. 2020, Article No. 119521. doi: 10.1016/j.conbuildmat.2020.119521
40. Cha, S.-L., and Jin, S.-S., “Prediction of Thermal Stresses in Mass Concrete Structures with Experimental and Analytical Results,” Construction and Building Materials, V. 258, Oct. 2020, Article No. 120367. doi: 10.1016/j.conbuildmat.2020.120367
41. Smolana, A.; Klemczak, B.; Azenha, M.; and Schlicke, D., “Early Age Cracking Risk in a Massive Concrete Foundation Slab: Comparison of Analytical and Numerical Prediction Models with On-Site Measurements,” Construction and Building Materials, V. 301, Sept. 2021, Article No. 124135. doi: 10.1016/j.conbuildmat.2021.12413