Materials Performance

MAR 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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WANTED Practical Technical Articles • Distinctive Cover Photos • News • Product Releases Send corrosion-related articles, photos, and other information for publication to: MP Managing Editor-in-Chief, NACE International, For MP article submission guidelines and more detailed information on types of information sought, visit submit-manuscript 45 MATERIALS PERFORMANCE: VOL. 57, NO. 3 MARCH 2018 compressive strength compared to that of the reference mortar, indicating that the mortar samples show better freeze thaw resistance after the silane addition. This can be explained by reason of the "cou pling" effect of the silane. In addition, the hydrophobic nature of silane and the cover age of microvoids also reduced the mois ture permeability of mortar and enhanced the freeze thaw resistance. Figure 4 shows the microstructures of the reference mortar and mortars with silane. The SEM image of the reference mor tar shows that an abundance of hydrated phases—calcium hydroxide [Ca(OH) 2 ], CH, and calcium silicate hydrate (C S H)—exist in the sample. For the mortars with 1% silanes, the silanes encase the mortar parti cles firmly. Further increases in the silane dosage results in the denser network of silane polymers. These findings help to explain the improvement of the mortar durability after the silane was added. Silanes perform a networking effect that holds mor tar particles together, which improves the freeze thaw behavior and carbonation cor rosion resistance, as well as the impervious ness and cracking resistance. Conclusions The objective of the present study was to evaluate the effects of silane on the dura bility of mortar samples. Thus, laboratory tests were conducted to evaluate the dura bility of mortar containing different silane dosages. • The silane additives were very effec tive in improving the mortar's imper viousness and freeze thaw resistance due to the hydrophobic nature of silane. • Because of the bridging action of the silane, the crack resistance of mortar was improved. • The carbonation resistance of mortar was improved due to the inherent advantages of siloxane, such as car bonation and chemical resistance. • The SEM images revealed that the siloxane polymer network improved the durability of mortar. Acknowledgments This work was supported by the Na tional Natural Science Foundation of China (51409203). The authors express their great appreciation of the funding supported by Research and Innovation Initiatives of WHPU (2015d3) and State Key Laboratory of Silicat e Mat erial s for Archit ectures ( W u h a n U n i v e r s i t y o f Te c h n o l o g y SYSJJ2016 13). References 1 H. Shan, et al ., "A Novel Electrochemical Technique for Enhancing Silane Penetration Depth into Mortar," Constr. Build . Material 144 (2017): pp. 645 649. 2 Z. Liu, W. Hansen, "Effect of Hydrophobic Surface Treatment on Freeze Thaw Durabil ity of Concrete," Cement Concrete Comp. 69 (2016): pp. 49 60. 3 D. Barnat Hunek, P. Smarzewski, "Influence of Hydrophobisation on Surface Free Energy of Hybrid Fiber Reinforced Ultra High Per formance Concrete," Constr. Build. Material 102 (2016): pp. 367 377. 4 L. Jiesheng, et al., "Properties of Polymer Modified Mortar Using Silane as an Integral Additive," J. Test. Eval. 1 (2016): pp. 175 182. 5 JGJ/T 70 2009, "Standard for Test Method of Basic Properties of Construction Mortar" (Beijing, China: MOHURD, 2009). 6 "Report on the Physical Properties and Dura bility of Fiber Reinforced Concrete," Ameri can Concrete Institute, ACI 544.5R 10, March 2010. 7 C. Zhou, et al ., "Corrosion Resistance of Novel Silane Functional Polybenzoxazine Coating on Steel," Corros. Sci. 70 (2013): pp. 145 151. 8 L. Jiesheng, W. Shaopeng, E. Dong, "Effect of Coupling Agent as Integral Blend Additive on Silicone Rubber Sealant," J. Appl. Polym. Sci. 4 (2013): pp. 2,337 2,343. LIU JIESHENG is an associate professor at Wuhan Polytechnic University, Wuhan City, Hubei Province, China, email: wsljs628@ A NACE International member, Jiesheng holds a Ph.D. GONG XIAOQIANG is a master student with Wu h a n P o l y t e c h n i c U n i v e r s i t y, e m a i l : LI FAPING is a master student with Wuhan Polytechnic University, email: lfp0911@126. com. HE XIANG is a professor at Wuhan Polytech- nic University, email: ZHANG RONGTANG is a professor at Wuhan Polytechnic University, email: 1640107545@ Editor's note: Learn more about reinforced concrete corrosion in this Materials Perfor- mance quarterly special feature, "e Science Behind It." Now that you're read the MP article on verifying the validity of silane as an additive by monitoring the corrosion behavior of silane enhanced mortar, explore the science b ehind th e corrosion problem , w hich i s pre sent ed in th e se rel at ed C O R R O S I O N articles: H. Yu, W.H. Hartt, "Effects of Reinforcement and Coarse Aggregates on Chloride In gress into Concrete and Time to Corro sion: Part 1—Spatial Chloride Distribution and Implications," Corrosion 63, 9 (2007): pp. 843 849. doi/abs/10.5006/1.3278434. E. Otero, D. de la Fuente, B. Chico, F. Madrid, V. Naranjo, M. Morcillo, "Atmospheric Corrosion Monitoring inside the Reac tor Vessel of a Retired Nuclear Power Plant," Corrosion 63, 6 (2007): pp. 591 597. http://corrosionjournal .org/doi/ abs/10.5006/1.3278409. A.A. Sagüés, "Modeling the Effects of Cor r o si o n o n t h e L i f e t i m e of E x t e n d e d R e i n f o r c e d C o n c r e t e S t r u c t u r e s ," C orrosion 59, 10 (2003): pp. 854 866. http : / / c or ro si onj o u r n al . org / d o i / ab s / 10.5006/1.3287706. T. Yonezawa, V. Ashworth, R .P.M. Procter, "Pore Solution Composition and Chlo ride Effects on the Corrosion of Steel in Concrete," Corrosion 44, 7 (1988): pp. 489 499. http://corrosionjournal .org/doi/ abs/10.5006/1.3583967. H.G. Wheat, Z. Eliezer, "Some Electrochemi cal A sp ects of Corrosion of St eel in Concrete," Corrosion 41, 11 (1985): pp. 640 645. http://corrosionjournal .org/ doi/abs/10.5006/1.3582998. Effects of Silane Additives on Corrosion Resistance and Durability of Mortar

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