Evidences about the interactions between grinding aids and cement particles surface

Valerio Antonio Paternò, Sara Ottoboni, Marco Goisis, Paolo Gronchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

Abstract

The measure of wettability of cement particles and the evaluation of the type and the strength of active surface sites of clinker particles were carried out to score the efficacy of organic grinding aids. The first analysis, based on the Washburn method, allows measuring the contact angle of cement with different solvents and is directly relatedf to the surface tension. The second analysis, based on the Hammet method, helps to classify the sites that may be responsible of the surface tension. Milled clinker (Portland clinker CEM I 52.5R; 0.025% w/wo DEG and TEA) was investigated. Firstly the wetting rates of powder with 4 different solvents (ethanol, n-hexane, toluene and formamide) were detected using a tensiometer. Then the powder dispersions in a solvent were titrated by acid solutions to get information on the acid/basic characterof the surface sites. Techniques and results are shown.
Original languageEnglish
Title of host publicationEleventh International Conference on Superplasticizers and other Chemical Admixtures in Concrete
Subtitle of host publicationOttawa, Ontario, Canada 10-13 July 2015
EditorsV. M. Malhotra, Pawan R. Gupta, Terence C. Holland
Place of PublicationFarmington Hills, MI
Pages211-226
Number of pages16
Publication statusPublished - 31 Mar 2016
Event11th International Conference on Superplasticizers and Other Chemical Admixtures in Concrete - Ottawa, Canada
Duration: 10 Jul 201513 Jul 2015

Conference

Conference11th International Conference on Superplasticizers and Other Chemical Admixtures in Concrete
CountryCanada
CityOttawa
Period10/07/1513/07/15

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Paternò, V. A., Ottoboni, S., Goisis, M., & Gronchi, P. (2016). Evidences about the interactions between grinding aids and cement particles surface. In V. M. Malhotra, P. R. Gupta, & T. C. Holland (Eds.), Eleventh International Conference on Superplasticizers and other Chemical Admixtures in Concrete: Ottawa, Ontario, Canada 10-13 July 2015 (pp. 211-226). [SP-302-16] Farmington Hills, MI.