STUDY OF ADHESION CHARACTERISTICS AND SURFACE INTERACTION OF BITUMEN AND FLYASH FROM POWER PLANTS

KOZHUKHOVA, NATALIA IVANOVNA and LEBEDEV MIKHAIL, SERGEEVICH and LIMARENKO MIKHAIL, VITALIEVICH (2017) STUDY OF ADHESION CHARACTERISTICS AND SURFACE INTERACTION OF BITUMEN AND FLYASH FROM POWER PLANTS. In: Sixth International Conference on Advances in Civil, Structural and Environmental Engineering - ACSEE 2017, 09-10 December, 2017, Rome, Italy.

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Abstract

Study of processes and mechanisms of realization of them in contact zone for construction composite materials is a very big problem. For fly ash (FA) based bitumen-mineral compositions studied in this paper adhesive strength between bitumen and FA particles is the base factor effected on properties of road-building material. Earlier was reported that low-calcium FA (type F) from Omsk power station (Russia) can adsorb much more content of bitumen vs. high-calcium one from Nazarovsk power station (Russia). It can be connected not only with structure as well as physical and mechanical characteristics of bitumen-mineral compositions but surface energy effect when bitumen and fly ash interaction. It is studied in this research. Adhesion between bitumen and FA particles was determined by adsorption/desorption effect of bitumen as well as energy between two contacted surfaces. It was found, that F-type FA has a quite high adsorption capacity. At the same time adsorption capacity for C-type FA to bitumen based on benzene solution is low. The results obtained are in agreement with calculated data for adhesion between bitumen and mineral particles of FA: adhesion for F-type FA-based composites is higher vs. type Cbased ones. It takes place independently of equal values of surface energy for a both types of FA. The data obtained demonstrate the best adhesion of bitumen to FA particles is realized in case of surface interaction by dispersion (Lifshitz-van der Waals) forces. This type of interaction is typical for F-type FA. For C-type FA almost 1/3 of total work of adhesion is consumed on polar (acid-basic) interactions and effect from dispersion force is twice lower vs. Ftype FA. So, data of bitumen adsorption and interaction energy in contact zone «FA - bitumen» explain physical and mechanical properties of bitumen-mineral composites based on different types of FA (with different composition and particle size).

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: fly ash from power plants, wetting effect, surface energy, work of adhesion, adsorption/desorption effect of bitumen
Depositing User: Mr. John Steve
Date Deposited: 10 Mar 2019 09:24
Last Modified: 10 Mar 2019 09:24
URI: http://publications.theired.org/id/eprint/269

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