Title:
Investigation of Pore Structure of Lightweight Ultra-High- Performance Concrete under Curing Regimes
Author(s):
Yang Li, Gaozhan Zhang, Jun Yang, Jian Zhang, Qingjun Ding
Publication:
Materials Journal
Volume:
119
Issue:
6
Appears on pages(s):
133-148
Keywords:
curing regime; hydration; lightweight aggregate; pore structure; products; ultra-high-performance concrete
DOI:
10.14359/51737188
Date:
11/1/2022
Abstract:
The apparent density of lightweight aggregate (LWA)-modified
ultra-high-performance concrete composite is 2080 kg/m3, and the compressive strength is not less than 110 MPa at 28 days. Lightweight ultra-high-performance concrete (LUHPC) not only has light weight and high strength, but also reduces the consumption of raw materials and the section size of the structure, thus reducing the cost. The macroscopic properties are closely related to the pore structure characteristics, but the structural nature of LUHPC under different curing regimes and the LWA on their pore structure remain unclear. To comprehensively understand the pore structure of LUHPC and then control its properties, capillary absorption method, low-field nuclear magnetic resonance (LF-NMR), computed tomography (CT), and nitrogen adsorption (BET) technologies
were used to characterize the pore structure characteristics
of LUHPC. The experimental results show that there are
many nanoscale pores (mainly harmful and more-harmful pores) in LUHPC. With the increase of water absorption of the added LWA, the porosity of LUHPC and the proportion of less-harmful pores increase, thus changing the pore structure of LUHPC. With the increase of temperature and pressure, the internal curing effect of LWA is accelerated. Heat treatment promotes the formation of dense additional hydrates such as tobermorite and xonotlite, and the average chain length of the hydrates and the pozzolanic reaction between supplementary cementitious material and Ca(OH)2. Steam curing increases the total porosity and coarsens the pore size while accelerating the hydration of cementitious paste. Autoclaved curing can stimulate the pozzolanic activity of inert SiO2, promote
the formation of secondary hydration products, and fill the pores in the matrix. The evolution of the pore structure of LUHPC plays a key role in improving its performance due to the curing regimes and presence of LWA.
Related References:
1. Schmidt, M., “Ultra-High Performance Concrete Hightech Material of the Future,” Betonwerk + Fertigteil-Technik, V. 70, No. 2, 2004, pp. 90-91.
2. Zhang, Y.; Zhang, W.; and Chen, Z., “A Complete Review of Ultra-High-Performance Concrete: Design and Preparation, Microstructure, Mechanics and Durability, Engineering Applications,” Materials Reports, V. 31, No. 23, 2017, pp. 1-16.
3. Zhu, Y.; Zhang, Y.; Hussein, H.; Liu, J.; and Chen, G., “Experimental Study and Theoretical Prediction on Shrinkage-Induced Restrained Stresses in UHPC-RC Composites under Normal Curing and Steam Curing,” Cement and Concrete Composites, V. 110, 2020, p. 103602. doi: 10.1016/j.cemconcomp.2020.103602
4. Pribramsky, V., “B4 Model Adaptation for Prediction of UHPC Strains from Creep and Shrinkage,” Diffusion and Defect Data, Solid State Data. Part B, Solid State Phenomena, V. 292, 2019, pp. 210-216. doi: 10.4028/www.scientific.net/SSP.292.210
5. Xie, T.; Fang, C.; Mohamad Ali, M. S.; and Visintin, P., “Characterizations of Autogenous and Drying Shrinkage of Ultra-High-Performance Concrete (UHPC): An Experimental Study,” Cement and Concrete Composites, V. 91, 2018, pp. 156-173. doi: 10.1016/j.cemconcomp.2018.05.009
6. Suzuki, M.; Meddah, S.; and Sato, R., “Long-Term Shrinkage and Stress in Ultra High Strength Concrete Using Porous Ceramic Waste for Internal Curing,” International RILEM Conference, 2010, pp. 5-7.
7. Justs, J.; Wyrzykowski, M.; Bajare, D.; and Lura, P., “Internal Curing by Superabsorbent Polymers in Ultra-High-Performance Concrete,” Cement and Concrete Research, V. 76, 2015, pp. 82-90. doi: 10.1016/j.cemconres.2015.05.005
8. Li, L.; Dabarera, A. G. P.; and Dao, V., “Time-Zero and Deformational Characteristics of High-Performance Concrete with and Without Superabsorbent Polymers at Early Ages,” Construction and Building Materials, V. 264, 2020, p. 120262. doi: 10.1016/j.conbuildmat.2020.120262
9. Ma, J.; Orgass, M.; Dehn, F., and Schmidt, D., “Comparative Investigations on Ultra High-Performance Concrete with and without Coarse Aggregates,” International Symposium on Ultra High-Performance Concrete, 2004.
10. Zhang, G.; Ge, J.; and Ding, Q.; Yang, J.; Xiang, W., “Preparation and Formation Mechanism of Lightweight Ultra-High-Performance Concrete,” Journal of The Chinese Ceramic Society, V. 49, No. 2, 2021, pp. 381-390.
11. Aldea, C. M.; Young, F.; Wang, K. S. S. P.; and Shah, S. P., “Effects of Curing Conditions on Properties of Concrete Using Slag Replacement,” Cement and Concrete Research, V. 30, No. 3, 2000, pp. 465-472. doi: 10.1016/S0008-8846(00)00200-3
12. Gonzalez-Corominas, A.; Etxeberria, M.; and Poon, C. S., “Influence of Steam Curing on the Pore Structures and Mechanical Properties of Fly-Ash High Performance Concrete Prepared with Recycled Aggregates,” Cement and Concrete Composites, V. 71, 2016, pp. 77-84. doi: 10.1016/j.cemconcomp.2016.05.010
13. Lei, Y., Micro-Properties of Cement Concrete, China Architecture & Building Press, 2017.
14. Wu, Z., and Lai, H. Z., High Performance Concrete, China Railway Publishing House, 1999.
15. Shen, P.; Lu, L.; He, Y.; Wang, F.; and Hu, S., “The Effect of Curing Regimes on the Mechanical Properties, Nano-Mechanical Properties and Microstructure of Ultra-High-Performance Concrete,” Cement and Concrete Research, V. 118, 2019, pp. 1-13. doi: 10.1016/j.cemconres.2019.01.004
16. Yu, Z.; Jin, Z.; and Zhang, Y., “Relationship between Pore Surface Fractal Dimension and Pore Structure of High Strength Cementitious Materials Cured by Different Methods,” Journal of the Chinese Ceramic Society, V. 45, No. 2, 2017, pp. 249-253.
17. Lothenbach, B.; Winnefeld, F.; Alder, C.; Wieland, E.; and Lunk, P., “Effect of Temperature on the Pore Solution, Microstructure and Hydration Products of Portland Cement Pastes,” Cement and Concrete Research, V. 37, No. 4, 2007, pp. 483-491. doi: 10.1016/j.cemconres.2006.11.016
18. Kjellsen, K. O.; Detwiler, R. J.; and Gjørv, O. E., “Pore Structure of Plain Cement Pastes Hydrated at Different Temperatures,” Cement and Concrete Research, V. 20, No. 6, 1990, pp. 927-933. doi: 10.1016/0008-8846(90)90055-3
19. Gu, C., “Chloride Transport Property and Service Life Prediction Of UHPFRCC Under Flexural Load,” dissertation, Southeast University, Nanjing, China, 2016. (in Chinese)
20. Yazıcı, H.; Yiğiter, H.; Aydın, S.; and Baradan, B., “Autoclaved SIFCON with High Volume Class C Fly Ash Binder Phase,” Cement and Concrete Research, V. 36, No. 3, 2006, pp. 481-486. doi: 10.1016/j.cemconres.2005.10.002
21. Zdeb, T., “Effect of Vacuum Mixing and Curing Conditions on Mechanical Properties and Porosity Of Reactive Powder Concretes,” Construction and Building Materials, V. 209, 2019, pp. 326-339. doi: 10.1016/j.conbuildmat.2019.03.116
22. Zhang, H.; Ji, T.; and Lin, X., “Pullout Behavior of Steel Fibers with Different Shapes from Ultra-High-Performance Concrete (UHPC) Prepared with Granite Powder under Different Curing Conditions,” Construction and Building Materials, V. 211, 2019, pp. 688-702. doi: 10.1016/j.conbuildmat.2019.03.274
23. Chatterji, S.; Thaulow, N.; and Christensen, P., “Puzzolanic Activity of Byproduct Silica-Fune from Ferro-Silicom Production,” Cement and Concrete Research, V. 12, No. 6, 1982, pp. 781-784. doi: 10.1016/0008-8846(82)90042-4
24. Pommersheim, J. M., and Clifton, J. R., “Mathematical Modeling of Tricalcium Silicate Hydration,” Cement and Concrete Research, V. 9, No. 6, 1979, pp. 765-770. doi: 10.1016/0008-8846(79)90072-3
25. Barbarulo, R.; Peycelon, H.; and Leclercq, S., “Chemical Equilibria Between C-S-H and Ettringite, at 20 and 85°C,” Cement and Concrete Research, V. 37, No. 8, 2007, pp. 1176-1181. doi: 10.1016/j.cemconres.2007.04.013
26. Matsui, K.; Kikuma, J.; Tsunashima, M.; Ishikawa, T.; Matsuno, S.; Ogawa, A.; and Sato, M., “In Situ Time-Resolved X-Ray Diffraction of Tobermorite Formation in Autoclaved Aerated Concrete: Influence of Silica Source Reactivity and Al Addition,” Cement and Concrete Research, V. 41, No. 5, 2011, pp. 510-519. doi: 10.1016/j.cemconres.2011.01.022
27. Peng, X.; Huang, J.; and Xing, D., “Analysis of Hydrates of Autoclaved Silicated Concrete and the Qualitative Relations of the Hydrates and Properties Of Concrete,” Journal of the Chinese Ceramic Society, V. 30, No. 6, 2002, pp. 798-802.
28. Zhang, Q.; Sun, S.; Chen, K.; Duan, S.; Peng, F.; Zhang, X.; and Ye, Q., “Variation of Ca(OH)2 Content and Carbonation of Binder Hardened Paste in Portland Cement and Fly-Ash System with Fly-Ash Added,” New Type of Building Materials, V. 41, No. 6, 2014, pp. 49-52.
29. Liu, Y., “Effect of Steam Curing on Swelling and Deformation Characteristics of Cement Paste and Mortar,” dissertation, Central South University, Changsha, China, 2008.
30. Yang, Q.; Zhang, S.; Huang, S.; and He, Y., “Effect of Ground Quartz Sand on Properties of High-Strength Concrete in the Steam-Autoclaved Curing,” Cement and Concrete Research, V. 30, No. 12, 2000, pp. 1993-1998. doi: 10.1016/S0008-8846(00)00395-1
31. Alhozaimy, A.; Jaafar, M. S.; Al-Negheimish, A.; Abdullah, A.; Taufiq-Yap, Y. H.; Noorzaei, J.; and Alawad, O. A., “Properties of High Strength Concrete Using White and Dune Sands Under Normal and Autoclaved Curing,” Construction and Building Materials, V. 27, No. 1, 2012, pp. 218-222. doi: 10.1016/j.conbuildmat.2011.07.057
32. Liu, X., “Effect of Curing Regimes and Sulphate Attack on the Properties and Microstructure of Ultra-High-Performance Concrete,” dissertation, Wuhan University of Technology, Wuhan, China, 2017.
33. Zhang, H.; Ji, T.; He, B.; and He, L., “Performance of Ultra-High-Performance Concrete (UHPC) with Cement Partially Replaced by Ground Granite Powder (GGP) Under Different Curing Conditions,” Construction and Building Materials, V. 213, 2019, pp. 469-482. doi: 10.1016/j.conbuildmat.2019.04.058
34. Shi, J.; Liu, B.; Zhou, F.; Shen, S.; Guo, A.; and Xie, Y., “Effect of Steam Curing Regimes on Temperature and Humidity Gradient, Permeability and Microstructure Of Concrete,” Construction and Building Materials, V. 281, 2021, p. 122562. doi: 10.1016/j.conbuildmat.2021.122562
35. Kurdowski W., Cement and Concrete Chemistry, Springer, 2014.
36. Ge, Y.; Kong, L.; Zhang, B.; and Yuan, J., “Effects of Aglite on Structure and Capillary Water Absorption Property of Concrete, Journal of the Chinese Ceramic Society, 2008.
37. Luo, D., and Niu, D., “Influences of Water-to-Cement Ratio and Curing Condition on Water Absorption of Internal Curing Concrete,” Journal of Building Structures, V. 40, No. 1, 2019, pp. 165-173.