Air Permeable Concrete
Author
Contri, Marco
Term
4. term
Education
Publication year
2011
Pages
88
Abstract
Rapporten præsenterer en teoretisk og eksperimentel undersøgelse af Air Permeable Concrete (APC), en beton med mange sammenhængende porer, så gasser eller væsker kan passere. Målet var at udvikle blandingsdesign, der kombinerer høj porøsitet og permeabilitet med tilstrækkelig trykstyrke (modstand mod at blive knust). Vi undersøgte også tilsætning af Phase Change Materials (PCM)—stoffer, der optager og frigiver varme ved bestemte temperaturer—og vurderede deres indflydelse på cementpastaens reologi (flydeadfærd) og APC’s trykstyrke. Valget af blandinger blev styret af laboratorietests af cementpastaens reologi og betonens bearbejdelighed (hvor let den er at blande og udstøbe). Vi testede blandinger med vand/cement-forhold på 0,30 og 0,35, hver med tre fyldningsgrader (0,4, 0,5, 0,6), som angiver hvor tæt materialerne fylder blandingen. Den eksperimentelle del udviklede praktiske metoder til blanding, udstøbning og hærdning, der sikrer de ønskede egenskaber i APC. Målemetoder blev fastlagt, og porøsitet, permeabilitet og trykstyrke blev kvantificeret. Teoretiske porositetsværdier blev beregnet og sammenlignet med laboratoriemålinger. Endelig blev resultaterne sammenholdt med andre studier af APC.
This report presents a theoretical and experimental study of Air Permeable Concrete (APC), a concrete designed to contain many interconnected pores so that gases or liquids can pass through. The goal was to develop mix designs that combine high porosity and permeability with acceptable compressive strength (resistance to being crushed). We also examined adding Phase Change Materials (PCMs)—substances that absorb and release heat at specific temperatures—and assessed how they affect the rheology (flow behavior) of cement paste and the compressive strength of APC. Mix design choices were guided by laboratory tests of cement paste rheology and overall concrete workability (ease of mixing and placing). We tested mixtures with water-to-cement ratios of 0.30 and 0.35, each prepared at three degrees of filling (0.4, 0.5, 0.6), representing different levels of how densely the constituents occupy the mixture. The experimental program developed practical methods for mixing, casting, and curing that reliably produce APC with the targeted properties. Measurement procedures were established, and porosity, permeability, and compressive strength were quantified. Theoretical porosity values were calculated and compared to laboratory measurements. Finally, the findings were compared with results reported in other APC studies.
[This abstract was generated with the help of AI]
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