HYGRIC PERFORMANCE ASSESSMENT OF AUTOCLAVED AERATED CONCRETE TREATED WITH NANO DISPERSIVE CALCIUM HYDROXIDE SOLUTION

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2022-2

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Tanideh, Gelareh

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The focus of the study is to uncover whether the treatment of autoclaved aerated concrete (AAC) surface with alcohol dispersion of calcium hydroxide Ca(OH)2 nanoparticles controls its high water absorption properties to some extent or not. AAC as a lightweight and porous concrete material, is well-known for its high breathing and thermal resistivity features while it suffers from high water absorption and capillary suction in exposed conditions. Laboratory analyses were conducted on four types of AAC, used as thermal insulation board, masonry infill unit, precast structural elements, and load-bearing masonry units. For the examinations, the nano dispersive Ca(OH)2 solution prepared at laboratory conditions was penetrated from exposed surfaces of AAC samples by capillary suction. The performance properties of the untreated and treated AAC samples were examined in terms of basic physical, physicomechanical, and hygric properties, with emphases on water vapor permeability, capillary suction, and fine porosity characteristics. The impact of the nano solution on the fine pores of AAC types and its penetration depth was monitored mainly with ultrasonic testing, image analyses of cross-sections by optical microscopy, and XRD analyses. The results show that the penetration of nano dispersive Ca(OH)2 solution reduces the capillary water suction to a certain extent on the surface perpendicular to the rising direction, which is the actual exposed surface at constructions. The physicomechanical properties of AAC products enhance after treatment while their inherent high breathing features are still kept. In addition, for in-situ monitoring of untreated and treated AAC surfaces the relevant ultrasonic reference data were established.

Subject Keywords

Autoclaved aerated concrete (AAC), Alcohol dispersion of calcium hydroxide (Ca(OH)2) nano particles, Hygric properties, Capillary suction, Ultrasonic testing

URI

https://hdl.handle.net/11511/96675

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

G. Tanideh, “HYGRIC PERFORMANCE ASSESSMENT OF AUTOCLAVED AERATED CONCRETE TREATED WITH NANO DISPERSIVE CALCIUM HYDROXIDE SOLUTION,” M.S. - Master of Science, Middle East Technical University, 2022.