Change orders have a strong potential to become difficult, because of its significant increase in cost and contract duration extension. This research identifies and evaluates the causes of change orders in design build ...

Portland cement is the worldwide most commonly used material in construction. However, it is known that the Portland cement industries have a significant negative impact in the environment. For this reason, there is a study ...

El marco regulatorio puertorriqueño en materia de Alianzas Público-Privadas (APP) está recogido en la Ley 29 de 2009, según enmendada, titulada «Ley de Alianzas Público-Privadas». Esta ley a su vez creó el marco institucional ...

This study encompasses the analysis of mechanical properties, durability and cost-effectiveness of concrete mixtures with nanosilica particles, silica fume and fly ash utilized as admixtures. The cost of materials for the ...

The World Bank indicated that inadequate infrastructure hinders local economic growth, competitiveness, and is a major cause for a deficient quality of life. For the past decade, the government of Puerto Rico has been ...

The defects caused by sanitary manholes on the asphalt pavement may affect the safety of the drivers on the roadway. The objective of this project is to study the effect of the manhole in the asphalt pavement in Puerto ...

A new optimization scheme procedure for arced labyrinth weir design is proposed to be used in a spillway value analysis, for the design of auxiliary spillways. The arced labyrinth spillway geometric design based on an ...

The use of mineral admixtures as substitute of cement in concrete is widely extended for various reasons. The reduction of doses of cement in the concrete mixtures reduces the material costs, decreases the pollution and ...

The durability of concrete is influenced by its porous network. The use of fly ash in concrete mixtures produces additional hydration products, changing its micro-structure. As a concrete admixture, fly ash not only improves ...