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EFFECTIVE ECOLOGICAL BUILDING MATERIALS BASED ON ACTIVATED ASH-CEMENT MIXTURES

Potapova, E.; Krivoborodov, Y.; Samchenko, S.; Kouznetsova, T.
Abstract:
Studies have been carried out to increase the activity of ashes and cements by separate or joint activation in an aqueous medium immediately before the preparation of concrete on the construction site. Activation was carried out in devices where the treated medium was subjected to hydrodynamic and cavitation effects. When using coarse-grained ash, it is possible to recommend either their preliminary grinding in an aqueous medium before adding into the concrete mixing unit, or joint activation with cement. The joint activation of the ashes with cement ensures a higher homogenization of the mixture, which results in significant cost savings, because does not require additional equipment for separate activation of materials. Besides, the joint activation of cement and ash significantly increases the strength of samples from cement stone and concrete. The strength of concrete samples based on activated ash-cement mixtures relative to concrete samples of the same composition but based on conventional cement and ash, is 3 days - 200 ... 230%, for 7 days - 170 ... 180% and 28 days hardening - 50 ... 60%. Thus, cement stone, obtained on the basis of jointly activated ash and cement, has an increased early strength due to increased pozzolanic activity of ashes and intensive hydration of clinker minerals, and late - due to the active participation of ash in the formation of the structure of cement stone. The obtained results make it possible to use ash and slag wastes more efficiently when obtaining cements and concretes on their basis.
SGEM Research areas:
Year:
2018
Type of Publication:
In Proceedings
Keywords:
ash-cement mixtures; pozzolanic activity; hydration; joint activation
Volume:
18
SGEM Book title:
18th International Multidisciplinary Scientific GeoConference SGEM 2018
Book number:
6.3
SGEM Series:
International Multidisciplinary Scientific GeoConference-SGEM
Pages:
135-142
Publisher address:
51 Alexander Malinov blvd, Sofia, 1712, Bulgaria
SGEM supporters:
Bulgarian Acad Sci; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Slovak Acad Sci; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; World Acad Sci; European Acad Sci, Arts & Letters; Ac
Period:
02-08 July, 2018
ISBN:
978-619-7408-52-2
ISSN:
1314-2704
Conference:
18th International Multidisciplinary Scientific GeoConference SGEM 2018, 02-08 July, 2018
DOI:
10.5593/sgem2018/6.3/S26.018
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