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Effect of Surfactants on Property of Binding Chloride in Cement Paste
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    Abstract:

    This paper aims to evaluate the influence of surfactants on the property of binding chloride in cement paste. Three surfactants,i.e.,TEA-Lauryl sulfate (TD),sodium dodecyl benzene sulfonate (LAS) and dodecyl polyglucoside (APG) are chosen to represent as cationic,anionic and nonionic surfactants,respectively. The chloride binding was determined by using the isothermal adsorption. Meanwhile,the mechanism of the influence of surfactants on the property of binding chloride in cement paste was discussed through the results from X-ray powder diffractometer (XRD) and thermal gravity analysis (TG-DTG). It is found that TD increases the chloride binding,but LAS and APG reduce the chloride binding. Compared with LAS,DPG has a weaker influence on the chloride binding. Besides,the different additions of surfactants have the similar effect on the chloride binding. Microscopic test results showed that all the surfactants mainly affected the physical absorption of chloride ions onto the cement hydrates,and exerted a minor influence on the chemical combination of chloride ions. In addition,modified stern double-layer model on cement surface was established.

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  • Received:
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  • Online: December 27,2017
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