Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/19826
Title: Experimental study of the water repellency and chloride resistance of modified concrete with silane
Authors: Zhang, P
Zhao, T
Dai, J 
Guo, P
Wittmann, FH
Keywords: Chloride penetration
Cracks
Neutron radiography
Silane
Water absorption
Issue Date: 2011
Source: Tumu gongcheng xuebao/China civil engineering journal, 2011, v. 44, no. 3, p. 72-78 How to cite?
Journal: Tumu Gongcheng Xuebao/China Civil Engineering Journal 
Abstract: The water repellency and chloride resistance of modified concrete with silane without and with cracks have been investigated through neutron radiography test, water absorption test and chloride penetration test. The results indicate that the process of water penetration into mortar specimens without silane can be visualized distinctly by means of neutron radiography, while water in the modified mortar with silane cannot be observed by naked eyes. The hydrophobic films formed in the capillary pores from the added silane effectively restrain liquid water from penetrating into mortar, and consequently it results in decreasing water absorption to be only 13% of mortar without silane. The hydrolysis and polymerization reaction of silane in cementitious materials do not block the respirability of the capillary pores. Cracks are instantaneously filled with water once specimens without silane crack, and after that water will penetrate into the adjacent areas around the cracks. However, even when the modified specimens with silane crack up to 0.3 mm, there is no obvious water movement observed. The cracks from 0.1 mm to 0.4 mm hardly decrease the integral water repellency of modified concrete with silane. Due to the high water repellency of the modified concrete with silane it thus also has high resistance to chloride penetration with or without cracks. It is an effective method to improve the water repellency and chloride resistance and thus the durability of cement-based materials by modifying concrete with silane.
URI: http://hdl.handle.net/10397/19826
ISSN: 1000-131X
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