Effects of Coal Bottom Ash on the Compressive Strength of Portland Cement Mortar

Abstract:

The possibility of utilizing treated coal bottom ash as a partial replacement of Portland cement was examined through compressive strength test on mortar samples. A total of 16 batches of mortar mixtures with cement:sand ratio of 1:2.5 and 1:2.75 were prepared using two types of treated coal bottom ash. The chemical compositions including the unburned carbon of coal bottom ash were also analyzed. In order to remove the excess unburned carbon which will affect the potential pozzolanic properties, the coal bottom ash was heated at 550 ± 50oC and 700 ± 50^°C for 60 min in an electrical furnace.The results showed that compressive strength of mortar mixtures with cement:sand ratio of 1:2.5 and 1:2.75 containing treated coal bottom ash which was heated at 550oC results in an increase in compressive strength. At 10% and 20% of treated coal bottom ash replacement levels to Portland cement, the compressive strength of the mortar mixture was significantly improved at the age of 28 days. The compressive strength of the mortar mixtures at early ages gives lower strength as compared to the plain Portland cement mortar. However, the effect of treated coal bottom ash that was heated at 700°C is to reduce the compressive strength of the mortar mixtures except for mixture with cement:sand ratio of 1:2.5 containing 10% coal bottom ash at 56 days.

• Periodical: Applied Mechanics and Materials (Volume 802)
• Pages: 149-154
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.802.149
• Online since: October 2015
• Authors: Ali Huddin Ibrahim, Kok Keong Choong, Megat Azmi Megat Johari, Shahril Izham Md Noor, Nur Liyana Zainal, Kamar Shah Ariffin
• Keywords: Chemical Compositions, Compressive Strength, Partial Cement Replacement, Treated Coal Bottom Ash

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