The impact of using wood ash as an effective primary material for producing concrete blocks

Using wood ashes as a replacement for cement is one of the promising ways to increase the pressure resistance (pushing resistance) and also is the heat insulation of concrete blocks. Current study is about using wood ashes as a partial replacement for the cement materials with the percentage of 10 %, 20 % and 30 % of ashes and its admixture with cement, ballast and sand during building the blocks. Experiments showed that pressure resistance of the sample blocks that contained 10% wood ash was 10 % more than the control sample. Furthermore, 10% of wood ashes are suitable for building concrete blocks and the blocks are near the standards and also in the sample containing 30 % of Pozzolan ash, less water absorption is observed.