High Performance and Conventional Concrete Properties Affected by Ashes Obtained from Different Type of Grasses

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Title: High Performance and Conventional Concrete Properties Affected by Ashes Obtained from Different Type of Grasses

Author(s): Diana Bajare, Girts Bumanis, Genadij Shakhmenko, and Janis Justs

Publication: Special Publication

Volume: 289

Issue:

Appears on pages(s): 1-14

Keywords: Bottom ash, Cement replacement, Concrete, High Performance Concrete

Date: 9/14/2012

Abstract:
This paper deals with the incorporation of the grass bottom ashes from biomass burning process into the composition of conventional and high performance concretes. The grass bottom ashes were obtained from the different Latvian pellet furnaces where agricultural biomass like a reed straw, mixture of canary reed grass and wheat straw, wheat straw and barley straw were used as a heat power source. The obtained bottom ashes were ground down to micro-level using different milling times. Chemical composition of ground ashes was determined. Since the well-burned grass ashes contain amorphous components, they are active as pozzolanic materials. However, the pozzolanic nature and properties of ashes depend on the type of grass, the method of pre-treatment and calcinations such as burning temperature and duration, burning and cooling conditions. The effect of pozzolans on the properties of the concrete depends not only on the activity of pozzolanic reaction, but also from the structural point of view when the micro particles can improve the packing of concrete structure. The impact of grass ashes on the physical properties of fresh high performance and conventional concrete mixtures was tested. The compressive strength was tested after 7, 28 and 310 days of curing period. The water absorption was determined for hardened concrete.