Investigation on waterproof mechanism and micro-structure of cement mortar incorporated with silicane: Fid-Bau Portal

Investigation on waterproof mechanism and micro-structure of cement mortar incorporated with silicane

Li, Faping / Liu, Lisheng / Liu, Ke / Zheng, Aohan / Liu, Jiesheng

Highlights • The waterproof mechanism of cement mortar were explained. • The hydration mechanism of cement paste with diverse silicane dosages were revealed. • The SEM, XRD, FT-IR and Nitrogen-absorption test were used to evaluate the micro-mechanism.

Abstract This paper aimed to investigate the effect of different dosages silicane on waterproof mechanism and micro-structure of control and modified cement mortar incorporated with silicane using water absorption of capillarity, crack resistance, wettability, permeability resistance and degree of hydration test. At the same time, the micro-structure mechanism of cement mortar were researched by the Scanning electron microscopy (SEM), the X-ray diffraction (XRD), the Fourier transform-infrared spectroscopy (FT-IR) and Nitrogen-absorption test. Modified cement mortar were prepared by incorporating 1%, 3% and 5% silicane into control cement mortar, respectively. The experimental results shown that for the different dosages silicone and mix designs used in this paper, the addition of silicane improved the crack resistance, contact angle and the permeability resistance while decreased the water absorption of capillarity compared with control cement mortar, which indicated that the waterproof of modified cement mortar was strengthened generally. The Non-evaporable water content was used to evaluate the degree of hydration of control modified cement paste. Experimental results illustrated that degree of hydration was restrained because of the incorporation of silicane, which could be testified using the XRD and FT-IR test. In addition, in comparison with control cement mortar, the maximum adsorption capacity and total pore volume of cement mortar were increased by the SEM and Nitrogen-absorption test, manifesting that most of pores of modified cement mortar was closed. Most importantly, the hydration and waterproof mechanism was revealed.