We discuss an initial value problem for an implicit second order ordinary differential equation which arises in models of flow in saturated porous media such as concrete. Depending on the initial condition, the solution features a sharp interface with derivatives which become numerically unbounded. By using an integrator based on finite difference methods and equipped with adaptive step size se...

Abstract It is a study on the influence of aggregate size, water-cement ratio, and target porosity compressive strength planting porous concrete. Experiment results show that concrete’s negatively correlated with size; no distinct linear relation ratio indicated, there an optimal in different mix proportions. Among three factors influencing concrete, ranks first followed successively by size ra...

1 Centro de Estudios Avanzados en Zonas Áridas, Facultad de Ciencias del Mar, Universidad Católica del Norte, Coquimbo, Chile, 2 Bren School of Environmental Science and Management, University of California, Santa Barbara, CA, USA, 3 Departamento de Ecología, Pontificia Universidad Católica de Chile, Alameda, Chile, 4 Facultad de Ingeniería y Ciencias and Facultad de Artes Liberales, Universida...

1) Institute of Zoology, Slovak Academy of Sciences, Dúbravská cesta 9, SK-84506 Bratislava, Slovakia (e-mail: [email protected]) 2) University of Trnava, Faculty of Education, Department of Biology, Priemyselná 4, P.O. Box 9, SK-91843 Trnava, Slovakia (e-mail: [email protected]) 3) Estación Experimental de Zonas Áridas (CSIC), Departamento de Ecología Funcional y Evolutiva, General S...

Structural health monitoring of porous materials such as concrete is becoming a major stake in our resource-limited economy, as it conditions durable exploitation of existing facilities. Durability in porous materials depends on nanoscale features which need to be monitored in-situ with nanometric resolution. To address this problem, we put forward an approach based on the development of a new ...

Concrete with siderurgical aggregates (SA) is a sustainable construction material great potential as structural concrete. For this reason, studies must be carried out on the behavior of concrete against prestressed elements, that open door to new applications such buildings, bridges or foundations. In study, feasibility established standardized adherence tests beams reinforced steel wires. The ...