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Everything posted by celleste

  1. In my flat, I have 2 internal concrete walls, one where I sleep against every night Im worried that I am exposing myself to silica dust or another contaminants that may come from concrete Im really not sure how much the concrete has been sealed and how much dust is coming from it Its obviously solid and not crumbling, but when i rub the concrete, its slightly chalky on my hand. Its also not glossy or smooth suggesting it hasn't been completely sealed? I can see some dust on the ledge below the wall, but dont know how much of this is household dust What do you think? Is there any risk? Ive added some inflation below, if that helps Thanks in advance! NB: Regarding regulations, Im not in US, but NZ, so not sure regulations here. Flat was built in 2017 BUILDERS INSTRUCTIONS FROM ARCHITECT (dont know what this means) Interior Concrete Walls (Wet areas): Clear concrete sealer suitable for wet area use INFORMATION FROM ARCHITECT (again, vague to a layperson) The external precast walls have a waterproofing additive added (data sheets attached). Internal concrete walls would not have this additive added. Information on concrete from material guide: PRODUCT NAME: Cement type; Gp, HE, CT and ASTM Type II MAJOR INGREDIENTS: Inert Aggregates 20-70% Cement 20-50% Additives + Polymer <10% COMPOSITION Portland cement clinker 85-95% 2mg/m3 I (1mg/m3 for respirable dust) Limestone <10% (10mg/m3) Calcium sulphate hemihydrate (10mg/m3) Flyash <3% has (see crystalline silica) Gypsum <5% Quartz <0.1% Hexavalent chromium <0.002% Crystalline Silica (all forms) 0.05mg/m3 (as respirable dust) PRODUCT NAME: Micosilica SF Composition: Silicon dioxide (amorphous) >85% Crystalline silica <0.67%
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