The Improvement of Thermal Insulating Concrete Panel

Ali Nasser Ali, Mohammed; Hadi Nema Khalif, Abdul; Alaa Lafta, Doaa

	The Improvement of Thermal Insulating Concrete Panel
Journal of Engineering
Article 1, Volume 24, Issue 5, 2018, Pages 1-13
Authors
Mohammed Ali Nasser Ali; Abdul Hadi Nema Khalif; Doaa Alaa Lafta
Abstract
The Iraqi houses flattening the roof by a concrete panel, and because of the panels on the top directly exposed to the solar radiation become unbearably hot and cold during the summer and winter. The traditional concrete panel components are cement, sand, and aggregate, which have a poor thermal property. The usage of materials with low thermal conductivity with no negative reflects on its mechanical properties gives good improvements to the thermal properties of the concrete panel. The practical part of this work was built on a multi-stage mixing plan. In the first stage the mixing ratio based on the ratios of the sand to cement. The second stage mixing ratios based on replacing the coarse aggregate quantities with the Alabaster aggregates, and the third stage the mixing ratios based on the replacement of wood ash instead of the sand. While the fourth stage mixing ratios based on decreasing the thermal conductivity and increasing mechanical properties by adding a multilayer of a plastic net. The result shows that using a concrete panel with components (cement, sand, coarse aggregate, wood ash, and Alabaster aggregates) with a mass ratio of (1:1:2:1:1) and 3-plastic layers, gives the best improvement of the thermal properties. Where, the thermal conductivity is reduced by 42% and the specific heat increased by 41.2% as compared to the traditional concrete panel mixing ratio, with mechanical properties are agreed with the Iraqi standards.
Keywords
wood ash; Alabaster aggregates; plastic layers

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