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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42 MARCH 2018 W W W.MATERIALSPERFORMANCE.COM COATINGS & LININGS C Silane coupling agent additives were used in mortar in varying proportions, and the effect of the coupling agent content on the mortar's corrosion cracking resistance and durability properties was studied. Due to the hydrophobic nature and bridging ac- tion of silane, mortar samples with the silane additive exhibited better per- formance when subjected to freeze- thaw cycles and imperviousness tests, and showed increased resistance to cracking and carbonation corrosion. Scanning electron microscopy im- ages illustrated that silanes have a networking effect that holds mortar particles together, resulting in the durability improvement. Concrete is often exposed to aggressive environments. Due to its porous structure, a g g re ssiv e a gent s (e.g., wat er, carb on dioxide [CO 2 ], and chloride and sulfate ions) in the environment have caused the deterioration of concrete, resulting in the decrease of its ser vice life. 1 A variety of methods have been applied that upgrade the durability of concrete structures by reducing the concrete's permeability. The a pp li c a t i o n of p o ly m e r c o a t i n g s i s a t echni qu e that reduces th e ingress of moisture and ions. 2 One of the methods used to protect the concrete surface from corrosion caused by moisture is hydro phobization, and silanes are one of the common surface hydrophobization treat ment agents for concrete structures. 3 Although research has shown that a silane surface treatment and siloxane poly mers seem promising for natural aggregate concrete, fewer studies have been con ducted to investigate polymer concrete using silane as an integral additive for the improvement of the durability of mortar and concrete. 4 Therefore, the present work is intended to verify the validity of silane as an additive by monitoring the corrosion behavior of silane enhanced mortar. Silane coupling agents were used in varying pro portions, and the effect of the coupling agent content on mortar properties was studied. Experimental Procedures Materials and Preparation The cement used was No. 42.5 ordinary Portland cement (OPC) made in China. The i n t e g r a l s i l a n e m o r t a r a d d i t i v e w a s (γ glycidoxypropyl)methyldimethoxysilane (KH 560). River sand with a fineness modu lus of 2.43 was used as the fine aggregate. A water/cement ratio of 0.4 was used for pre paring mortar mixtures incorporating no silane (the reference sample), and 1, 3, and 5% silane. Distilled water was used to pre pare the mortars. Imperviousness Test Th e imp er v iou sn e ss t e st wa s c on ducted according to the Chinese Standard Effects of Silane Additives on Corrosion Resistance and Durability of Mortar Liu Jiesheng, g ong Xiaoqiang, Li Faping, h e Xiang, and Zhang Rongtang, School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, Hubei, China

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