Publication Date : 01/02/2018

Author(s) :

Tifase, S. A, Uche, O.A.U., Aboshio, A.

Volume/Issue :
Volume 13
Issue 1
(02 - 2018)

Abstract :

This study investigates the effects of incineration methods of industrial wood waste ash (IWWA) on the engineering properties of concrete when IWWA is used as partial replacement of Portland cement. The IWW was incinerated in an uncontrolled (open incineration) and controlled environment (incineration in a furnace at a temperature of 550oc-600oc). X-ray fluorescence was used to analyze the oxide composition of the resulting ash from both incineration conditions. The ash was grinded using a Disk mill (FFC 15) with a sieve size of 0.66mm in it. By using absolute volume method of 1:2:4 concrete mix with a water/cement ratio of 0.55, concrete cubes measuring 150mm x 150mm x 150mm were made from nine different concrete mixes prepared by using IWWA to replace 0%, 5%, 10%, 15% and 20% of Portland cement by mass for both controlled and uncontrolled incineration of wood waste ash. The workability of the fresh concrete mixes was evaluated using the slump test and the compressive strengths of concrete cubes were evaluated at 1, 7, 28, 56 and 90 days. Test results indicate that IWWA is pozzolanic, workability of the concrete mix decreases with an increase in replacement percentage of cement with IWWA for both incineration conditions. Compressive strength of IWWA/OPC concrete increases with age of curing and it decreases with increasing IWWA replacement. The compressive strength of concrete was lower at early stages but improved significantly up to 90 days. The optimum compressive strength is 20.15N/mm2 for replacement of cement with 20% of uncontrolled IWWA at 28 days. The maximum compressive strength of 31.40N/mm2 at all ages of testing was obtained at 90 days for 5% replacement of cement with controlled incinerated IWWA. Minitab 11 was used to carry out the statistical modeling of the IWWA-concrete.

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