The Influence of Carbonization on the Performances of Fly Ash Geopolymeric Concrete

Abstract:

Two mixtures were designed to manufacture ordinary Portland cement concrete (PCC) and alkali-activated fly ash geopolymeric concrete (FGC). The depth of carbonation at 3rd,7th,14th and 28th day were measured according to the carbonization test method in “Ordinary Concrete Long-term Performance and Durability Test Method Standard”(GB/T 50082-2009) by spotting with phenolphthalein solution. The changes of compressive strength of the specimens carbonized with different days were tested and compared, as well as the pH value of specimens’ surfaces. Furthermore, the changes in microstructure and chemical composition were observed through the scanning electronic microscope (SEM) and energy dispersive X-ray spectrometer (EDX), respectively. The results show that although the compressive strength of FGC decreased significantly at first, but there is no obvious effect of carbonization on compressive strength, pH value and chemical composition of FGC as carbonation going on. Moreover, the microstructure of FGC is more homogeneous and denser. It can be concluded that compared with PCC, carbonization resistance of FGC is much better.

• Periodical: Applied Mechanics and Materials (Volumes 744-746)
• Pages: 1519-1526
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.744-746.1519
• Online since: March 2015
• Authors: Qi Huang, Xiaoshuang Shi*, Qingyuan Wang, Ling Tang
• Keywords: Carbonization, Chemical Composition, Compressive Strength, Geopolymer, SEM

References

[1] L.S. Chen. The carbonization mechanism, influencing factor and prediction model of concrete [J]. Journal of North China Institute of Water Conservancy Hydroelectric Power, 2010, 31 (3): 35-39. (in Chinese).

[2] ZHANG Hai-yan, LI Guang-yu, YUAN Wu-qin. Experiment Study on Carbonization of Concrete [J]. China Rural Water and Hydropower, 2006, (8): 78-81. (in Chinese).

[3] Padadakis V G, Vayenas C G, Physical and chemical characteristics affecting the durability of concrete [J]. ACI Mater J, 1991, 88 (3-4): 186.

[4] Davidovits J. Geopolymers and Geopolymeric materials[J]. J. of Ther. Anal, 1989, (35): 429-441.

[5] Davidovits J. Recent progresses in concretes for nuclear waste and uranium waste containment [J]. Concrete International, 1994, (6): 53-58.

[6] ZHENG Juanrong, TAN Zuwei. The progress of research on polymer materials [J]. Gypsum and Cement for Building, 2002, 4: 11-12. (in Chinese).

[7] An Jinpeng, Lu Zhongyuan, Yan Yun. Study on Modification of Fly Ash Based Geopolymers and Adsorbing Pb (Ⅱ)，China Powder Science and Technology, 2008, 14(4): 33-37. (in Chinese).

[8] XIAO Jia, GOU Cheng-fu. Overview of the research for concrete carbonation [J]. Concrete, 2010, 243 (1): 40-52. (in Chinese).

[9] JI Yong-sheng, ZHANG ling-lei, MA Hui-rong, et al. Experimental Research and Mechanism Analysis on Semi-carbonation Zone in Concrete[J]. Journal of Building Materials, 2012, 15(5): 624-628. (in Chinese).

[10] LONG Tao, SHI Xiao-shuang, WANG Qing-yuan, et al. Mechanical Properties and Microstructure of Fly Ash Based Geopolymeric Polymer Recycled Concrete [J]. Journal of Sichuan University (Engineering Science edtion), 2013, 45(1): 43-47. (in Chinese).

[11] LIU Zu-hua, LIANG Fa-yun. Remarks on the researches of carbonated concrete[J]. Building Science Research of SiChuan, 2000, 26(3): 52-54. (in Chinese).

[12] Alekseev. Reinforcing steel corrosion and protection in RC structure[M]. Translated by Huang Kexin, Wu Xingzu, et al. Beijing: China Building Industry Press, (1983).

[13] HONG Naifeng. Alkalinity of concrete and rebar corrosion[J]. China Concrete and Cement Products, 1990, (5): 16-18.

[14] LIU Jun-zhe. A review of carbonation in reinforced concrete(Ⅲ)—Migration of corrosive factors in concrete[J]. Concrete, 2006, (1): 51-54. (in Chinese).

[15] X.S. Shi, F.G. Collins, X.L. Zhao, et al. Mechanical properties and microstructure analysis of fly ash geopolymeric recycled concrete[J]. Journal of Hazardous Materials, 2012, 20(29): 237-238.

DOI: 10.1016/j.jhazmat.2012.07.070

[16] Shi X S, Wang Q Y, Zhao X L, et al. Discussion on Properties and Microstructure of Geopolymer Concrete Containing Fly Ash and Recycled Aggregate[J]. Advanced Materials Research, 2012, 450: 1577-1583.

DOI: 10.4028/scientific5/amr.450-451.1577