Los agregados utilizados en la construcción en la zona de Bahía Blanca
| cic.isFulltext | true | es |
| cic.isPeerReviewed | true | es |
| cic.lugarDesarrollo | Centro de Geología Aplicada, Agua y Medio Ambiente | es |
| cic.parentType | Objeto de conferencia | |
| cic.version | info:eu-repo/semantics/submittedVersion | es |
| dc.date.accessioned | 2016-12-12T12:46:37Z | |
| dc.date.available | 2016-12-12T12:46:37Z | |
| dc.identifier.uri | https://digital.cic.gba.gob.ar/handle/11746/4945 | |
| dc.title | Los agregados utilizados en la construcción en la zona de Bahía Blanca | es |
| dc.type | Documento de conferencia | es |
| dcterms.abstract | Coarse and fine aggregates used in the elaboration of portland cement concrete in the area of Bahía Blanca, province of Buenos Aires, were studied. Sand pits, gravel and crushed rock quarries were surveyed and analyzed. Pavements made with these materials usually exhibit deterioration problems due to the alkali-silica reaction, caused by both the high content of deleterious materials (mainly volcanic glass, volcanic rocks with a vitreous matrix, metamorphic rocks containing strained quartz) and the use of highalkali cement. The petrography of the aggregates was studied with a stereoscopic microscope and by polarization microscopy on thin sections, and standard granulometric curves were traced. Chemical analyses to evaluate alkali-silica reaction potential (ASTM C-289) and physical tests applying the mortar bar test were performed in accordance with ASTM C-227, and were supplemented with XRD, SEM, EDAX and chemical analyses. The fine aggregate studied was derived from 8 quarries, three of eolian origin, 2 of marine origin and 3 of fluvial origin. The eolian quarries are mainly composed of volcanic rocks almost always with a vitreous matrix (40 %); granitic rocks and quartz in lower proportions were identified. It is common to observe fragments of unweathered volcanic glass that at some levels reaches 10 %. These aggregates are very fine-grained. They are generally mixed with marine sands to improve the granulometric curves. The petrographic and mineralogical composition is similar to that of the eolian sand, with mollusk valves concentrated at shell debris levels. Quartz and granitic rocks predominate in the composition of fluvial sands. Deleterious materials are scarce. Gravels originate from two quarries, one of marine origin and the other of fluvial origin, composed of gravel levels intercalated with sands. The petrography of the material from the quarry of marine origin is similar to that of the sands. It was classified as unsuitable to be used as concrete aggregate by physical and chemical tests. The main deleterious component is volcanic glass. Quartizites and granitic rocks predominate in the petrographic composition of the quarry of fluvial origin. Deleterious components are scarce but strained quartz is abundant. Crushed rock originates from 2 quarries; it is crushed on site and classified into different grain sizes. The rocks are granites and quartzites. The former are excellent materials for concrete elaboration. Both the petrographic study, and chemical and physical tests classify them as suitable aggregates. Quartizites exhibit deleterious expansion on mortar bars, although the dissolved silica content is within the limits allowed by the standard. This is due to the presence of fine quartz with strong undulatory extinction. It can be classified as a slow reacting aggregate with respect to the alkali-silica reaction. | en |
| dcterms.creator.author | Marfil, Silvina Andrea | es |
| dcterms.creator.author | Maiza, Pedro | es |
| dcterms.extent | 8 p. | es |
| dcterms.isPartOf.issue | XVII Congreso argentino de mecánica de suelos e ingeniería geotécnica. III Cong. argentino de presas y aprovechamientos hidroeléctricos. VII Simposio de geología aplicada a la ingeniería y al medio ambiente. III Simposio argentino de mecánica de rocas. V Reunión sobre preparación y uso de mapas temáticos. | es |
| dcterms.isPartOf.series | Congreso argentino de mecánica de suelos e ingeniería geotécnica. Congreso argentino de presas y aprovechamientos hidroeléctricos. VII Simposio de geología aplicada a la ingeniería y al medio ambiente. III Simposio argentino de mecánica de rocas. V Reunión sobre preparación y uso de mapas temáticos. | es |
| dcterms.issued | 2004-10 | |
| dcterms.language | Español | es |
| dcterms.license | Attribution 4.0 International (BY 4.0) | es |
| dcterms.spatial | Bahía Blanca | es |
| dcterms.subject | aggregates | en |
| dcterms.subject | sand | en |
| dcterms.subject | gravel | en |
| dcterms.subject | crushed rock | en |
| dcterms.subject.materia | Geología | es |
Files
Original bundle
1 - 1 of 1
Loading...
- Name:
- 72.pdf-PDFA.pdf
- Size:
- 453.38 KB
- Format:
- Adobe Portable Document Format
- Description:
- Documento completo