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This paper reports the result of research aimed at assessing the thermal conductivity of wood ash blended cement mortar. Wood ash obtained from bread bakery, was used as partial replacement for ordinary Portland cement in mortar production with replacement ranging from 5% to 25%. Mortar specimen with no wood ash content served as the control. The physical and chemical properties of fly ash were reviewed to evaluate the possible effect on cement properties. Mortar specimens were prepared using cementitious material to sand ratios 1:1, 1:2 and 1:3. The mortar specimens were air-cured for 15 days and oven-dried for 24 hours for complete removal of moisture before thermal conductivity test was carried out on them. For mix ratio 1:1, the thermal conductivity results obtained were 1.399, 1.175, 1.129, 1.040, 1.019 and 1.039 (W/m°C) for the control, 5%, 10%, 15%, 20% and 25% fly ash replacement respectively. Similar trends were observed for 1:2 and 1:3 mix ratios. The results showed that the thermal conductivity decreases as the wood ash percentage increases. The thermal conductivity of the control cubes for mix ratio 1:1 gave the highest value. It was concluded that the replacement of cement by wood ash reduces the thermal conductivity of mortar.
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