Influence of High-Calcium Ash Composition on the Composite Binders’ Properties

Abstract:

The paper presents the studies’ results of chemical composition, structure, and physico-mechanical properties of high-calcium ashes from the Kansk-Achinsk coals (2017-2019 selection). It was found that ash has a complex poly-mineral composition and contains hydraulically active minerals and oxides of СаОfr, β-C₂S, CA, C₃A, C₄AF, C₂F, CaSO₄. According to the content of CaOfr, MgO does not meet standards’ requirements. The uniformity of the volume change is maintained by the composition with 50% of cement. The structure and hardening kinetics of ash and ash-cement stone compositions, obtained from the test of normal density, were analyzed. It was established that the hardening of compositions with ash from the Kansk-Achinsk coals was largely influenced by ash minerals. An equivalent amount of cement in composite binders cannot be replaced. In order to obtain a positive effect, compositions with ash instead cement of no more than 30% and a part of fine aggregate, without exceeding the ratio of ash: cement = 1: 1, should be used.

• Periodical: Solid State Phenomena (Volume 316)
• Pages: 1019-1024
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.316.1019
• Online since: April 2021
• Authors: O. A. Ignatova*, A. A. Dyatchina
• Keywords: Ash-Cement Stone, Chemical Composition, Composite Binders, Hardening Kinetics, High-Calcium Ashes of the Kansk-Achinsk Coals, Mineral, Structure

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