Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/33439
Title: Influence of electro-osmosis applied to concrete demoulding on its properties
Authors: Bian, Ce
Tian, Zhenghong
Mao, Long
Wu, Jun
Keywords: Electro-osmosis;Demoulding;Concrete;Pore structure;Surface permeability;Compressive strength
Issue Date: Oct-2015
Publisher: NISCAIR-CSIR, India
Abstract: The influence of voltage applied for better demoulding concrete on its properties including hydration process at early age, formed pore structure, surface permeability and compressive strength is studied through a series of methods such as conductivity, non-evaporable water content and mercury intrusion porosimetry (MIP). Test results show that : (i) increasing voltage results in a drop in degree of hydration caused by assemble of cement grains on one hand and on the other hand the increase of quantity of water transported toward cathode and anode due to the effect of electro-osmosis; (ii) as the voltage increases, the porosity, critical pore radius and volume fraction of larger capillary pores decrease at first mainly due to reduction of water-cement ratio (w/c) by displacing water then increase caused by reduction of degree of hydration and water block at the concrete/mold interface, but placing filter cloth on the mold walls could slow down the adverse changes of properties; (iii) variation of surface permeability with voltage is similar with that of porosity as well as critical pore radius and the permeability has a good correlation with the two parameters while compressive strength is good correlated with volume fraction of larger capillary pores.
Page(s): 559-569
URI: http://hdl.handle.net/123456789/33439
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.22(5) [October 2015]

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