Engineering Performance of Polyurethane Bonded Aggregates

In this paper the engineering performance of polyurethane (PUR) bonded aggregate were studied. The engineering performance, including compressive and flexural mechanical properties, void ratio, and coefficient of permeability were determined through laboratory tests. Moreover, the effects of two different curing conditions on the compressive strength properties of a PUR bonded aggregate were also evaluated. The compressive strengths of PUR bonded aggregates were found to be lower than that of conventional porous concrete, which is a commonly used cushion material. However, experimental results indicated a higher void ratio and coefficient of permeability, lower elasticity modulus, better toughness, and stronger adaptability to flexural deformation compared to porous concrete. Consequently, PUR bonded aggregate is a better solution than porous concrete when used as the cushion material of a geomembrane surface barrier for a high rock-fill dam

Pervious Concrete Made of Lightweight Aggregate : Master's Thesis

Porozni beton je posebna vrsta betona koja zahvaljujući maloj volumnoj koncentraciji agregata ima veliki udio šupljina. U ovom radu proučavala su se svojstva poroznog betona izrađenog od laganog betona. Izrađeno je sedam različitih mješavina. Osim laganoga agregata različitih frakcija, u neke mješavine dodani su drobljeni agregat, leteći pepeo ili granulirano staklo. Ispitana su i analizirana njihova svojstva u svježem i očvrslom stanju. U svježem stanju ispitana je konzistencija mješavina, dok je u očvrslom ispitana njihova poroznost, propusnost te tlačna i vlačna čvrstoća.Pervious concrete is a special type of concrete which has high total void ratio thanks to small volume concentration of aggregates. The properties of pervious concrete made of lightweight aggregate have been examined in this study. Seven different mixtures have been made. Except lightweight aggregate of different sizes, crushed aggregate, flying ashes or granulated glass have also been added to some mixtures. Their properties in fresh and hardened state have been examined and analysed. Consistency of mixtures has been examined in fresh state, while porosity, permeability, compressive and tensile strength have been examined in hardened state

Pervious Concrete Made of Lightweight Aggregate : Master's Thesis

Porozni beton je posebna vrsta betona koja zahvaljujući maloj volumnoj koncentraciji agregata ima veliki udio šupljina. U ovom radu proučavala su se svojstva poroznog betona izrađenog od laganog betona. Izrađeno je sedam različitih mješavina. Osim laganoga agregata različitih frakcija, u neke mješavine dodani su drobljeni agregat, leteći pepeo ili granulirano staklo. Ispitana su i analizirana njihova svojstva u svježem i očvrslom stanju. U svježem stanju ispitana je konzistencija mješavina, dok je u očvrslom ispitana njihova poroznost, propusnost te tlačna i vlačna čvrstoća.Pervious concrete is a special type of concrete which has high total void ratio thanks to small volume concentration of aggregates. The properties of pervious concrete made of lightweight aggregate have been examined in this study. Seven different mixtures have been made. Except lightweight aggregate of different sizes, crushed aggregate, flying ashes or granulated glass have also been added to some mixtures. Their properties in fresh and hardened state have been examined and analysed. Consistency of mixtures has been examined in fresh state, while porosity, permeability, compressive and tensile strength have been examined in hardened state

Study of porous concrete multifunctional urban surfaces

RESUMEN: Los pavimentos de hormigón poroso son un tipo de firmes permeables, considerados uno de los Sistemas Urbanos de Drenaje Sostenible (SUDS) más completos. Su estructura porosa es adecuada para que el tráfico rodado y los peatones puedan transitar sobre ellos, mientras permiten que el agua proveniente de la lluvia se infiltre a las capas inferiores hasta llegar al subsuelo, o se almacene para un uso posterior, controlando la escorrentía superficial, y disminuyendo la contaminación del agua. En la presente tesis doctoral se ha trabajado en el desarrollo de una nueva metodología de diseño que permita el incremento de la resistencia mecánica, manteniendo una infiltración del agua adecuada. Se han empleado diversos agregados, granulometrías, aditivos y fibras, métodos de compactación, así como materiales alternativos al cemento (geopolímeros), evaluados mediante diversos ensayos mecánicos, hidráulicos y superficiales. Discutiendo y comparando los resultados con herramientas estadísticas y de análisis multi-criterio para obtener las dosificaciones óptimas.ABSTRACT: Porous concrete pavements are considere done of the most complete Sustainable Urban Drainage Systems (SUDS). Its porous structure is suitable for road traffic and pedestrians, while allowing rainwater to infiltrate into the inner layers reaching the subsoil, or to be stored for later use, controlling surface runoff, decreasing water pollution. The present doctoral thesis has worked on the development of a new methodology of design that allows the increase of mechanical resistance while maintaining an adequate water infiltration. Different aggregates, gradations, additives and fibers, and compaction methods have been used, as well as alternative materials to cement (geopolymers), evaluated through various mechanical, hydraulic and superficial tests. Results have been discussed and compared through statistical and multi-criteria analysis tools to obtain the optimal dosages