Evaluation of thermal performance and durability of the external vertical sealing system using ceramic plates containing sludge from a water treatment plant and rice husk ash

Reference	Presenter	Authors (Institution)	Abstract
06-144	Antonio Rodrigues Petterle	Petterle, A.R.(Universidade federal do Pampa); Lorenzi, L.S.(Universidade Federal do Rio Grande do Sul); Chong, W.(Universidade Federal do Pampa); Tamborim, S.M.(Universidade Federal do Rio Grande do Sul);	Pressed ceramic plates were obtained from mixtures with different proportions containing kaolin clay, silica extracted from the rice husk after burning at controlled temperature and sludge from a water treatment plant (SWTP). Physical properties such as bulk density, water absorption and porosity, mechanical properties such as compressive strength, and thermal properties such as thermal conductivity of the powder mixtures (DIN EN99315 standard) and ceramic plates after firing (DIN EN12667) were evaluated. The silica when inserted in the kaolin clay provides increase of the glassy phase, reduction in the porous phase, reduction of thermal conductivity and increase of mechanical resistance. The use of the SWTP when inserted in the ceramic mass provides a considerable increase of the mullite and cristobalite peaks, expressive increase of porosity and decrease of the thermal and mechanical resistances. The ceramic plates with a mixture trace containing 80% kaolin clay, 20% silica rice husk and 10% LETA showed the lowest values of thermal conductivity in the form of powder up to 0.1443 W / mK and in the ceramic plate after burning up to 0.2574W / mK, and the highest compressive strength of 189.97 MPa when compared to the other traces tested. Due to these thermomechanical properties, the ceramic plates with this formulation were applied as a coating on a real-scale wall with dimensions 1.20 m wide x 2.40 m high, being submitted to the thermal performance evaluation tests and as well as durability, according to ABNT NBR 15575. The results of the durability performance test of the system not showed degradations, such as deformation, cracking and displacement, and presented an instantaneous horizontal displacement of 1.13 mm, being below the established limit by NBR 15575 which is 8 mm. Another test carried out was the thermal performance of the system resulting in adequate thermal insulation for use in buildings.
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