WFRF:(Hvitt Strömvall Ann Margret 1963)
Sökning: WFRF:(Hvitt Strömvall Ann Margret 1963) > Leaching of concret...
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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 04233naa a2200289 4500 | |
| 001 | oai:research.chalmers.se:7078ff21-7c7c-4b38-9cf6-6abcfc398cdd | |
| 003 | SwePub | |
| 008 | 171007s2001 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://doi.org/10.1021/es000138h2 DOI |
| 024 | 7 | a https://research.chalmers.se/publication/2140642 URI |
| 040 | a (SwePub)cth | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a art2 swepub-publicationtype |
| 072 | 7 | a ref2 swepub-contenttype |
| 100 | 1 | a Andersson, Åse,d 1971u Chalmers tekniska högskola,Chalmers University of Technology4 aut |
| 245 | 1 0 | a Leaching of concrete admixtures containing thiocyanate and resin acids |
| 264 | c 2001-01-12 | |
| 264 | 1 | b American Chemical Society (ACS),c 2001 |
| 520 | a There is an increasing concern about the emission of pollutants during the construction and lifetime of buildings. The leaching of concrete admixtures containing thiocyanate and resin acids was studied using standard leaching tests and chemical analysis. Ecotoxicological risk was assessed for each admixture. Thiocyanate leaching from concrete, with a chlorine-free accelerating admixture, was determined by ion chromatography. Of the total amount of thiocyanate added, 6-8% was emitted within 30 d. The thiocyanate diffusion curve indicates a fast dissolution process from the surface layer, followed by a slower continuous diffusion process. Thiocyanate exhibits both acute and chronic toxicity, which makes it of immediate environmental concern. Resin acid leaching from concrete test specimens containing an admixture of air-entraining agents with tall oil was determined by solid-phase extraction, methylation, and GC/MS. Of added resin acids, 10% was emitted over 143 d. The leaching curves for the resin acids indicate a continuous diffusion that is proportional to the square root of time and follows Fick's first law of diffusion. The chemical composition of the resin acids in the leachate demonstrates degradation and rearrangement of the resin acids during diffusion. Resin acids emitted from concrete are of environmental concern because they are persistent and have the ability to bioaccumulate in aquatic organisms. | There is an increasing concern about the emission of pollutants during the construction and lifetime of buildings. The leaching of concrete admixtures containing thiocyanate and resin acids was studied using standard leaching tests and chemical analysis. Ecotoxicological risk was assessed for each admixture. Thiocyanate leaching from concrete, with a chlorine-free accelerating admixture, was determined by ion chromatography. Of the total amount of thiocyanate added, 6-8% was emitted within 30 d. The thiocyanate diffusion curve indicates a fast dissolution process from the surface layer, followed by a slower continuous diffusion process. Thiocyanate exhibits both acute and chronic toxicity, which makes it of immediate environmental concern. Resin acid leaching from concrete test specimens containing an admixture of air-entraining agents with tall oil was determined by solid-phase extraction, methylation, and GC/MS. Of added resin acids, 10% was emitted over 143 d. The leaching curves for the resin acids indicate a continuous diffusion that is proportional to the square root of time and follows Fick's first law of diffusion. The chemical composition of the resin acids in the leachate demonstrates degradation and rearrangement of the resin acids during diffusion. Resin acids emitted from concrete are of environmental concern because they are persistent and have the ability to bioaccumulate in aquatic organisms. | |
| 650 | 7 | a TEKNIK OCH TEKNOLOGIERx Samhällsbyggnadsteknik0 (SwePub)2012 hsv//swe |
| 650 | 7 | a ENGINEERING AND TECHNOLOGYx Civil Engineering0 (SwePub)2012 hsv//eng |
| 700 | 1 | a Hvitt Strömvall, Ann-Margret,d 1963u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)annmargr |
| 710 | 2 | a Chalmers tekniska högskola4 org |
| 773 | 0 | t Environmental Science & Technologyd : American Chemical Society (ACS)g 35:4, s. 788-793q 35:4<788-793x 0013-936Xx 1520-5851 |
| 856 | 4 8 | u https://doi.org/10.1021/es000138h |
| 856 | 4 8 | u https://research.chalmers.se/publication/214064 |
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