Dry and wet 'deposition' studies of the degradation of cement mortars
| Autor: | S. Martínez-Ramírez, G. E. Thompson |
|---|---|
| Jazyk: | English<br />Spanish; Castilian |
| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Materiales de Construccion, Vol 48, Iss 250, Pp 15-31 (1998) |
| Druh dokumentu: | article |
| ISSN: | 0465-2746 1988-3226 |
| DOI: | 10.3989/mc.1998.v48.i250.476 |
| Popis: | The reaction of portland cement mortars with SO2 gaseous pollutant and artificial 'acid rain' solution has been examined using laboratory exposure chambers, with realistic presentation rates of pollutants. The mortar were previously carbonated to produce superficial carbonation. Two mortars with different w/c ratio and hence specific surface were prepared and exposed into the chambers. For dry deposition of SO2 pollutant gas, the important roles of water and water plus oxidant in increasing chemical reaction are readily revealed. Further, accessible porosity also increases reaction through increased times of reaction of pollutant with the mortars. Interestingly, in the absence of deliberate surface wetting, the presence of oxidant, ozone, leads to a reduction in the already limited extent of reaction. Wet deposition studies using artificial 'acid rain' solution result in gypsum formation, which is more extensive for mortars of increased w/c ratios. |
| Databáze: | Directory of Open Access Journals |
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