4 research outputs found
Subsurface Visualization Using Ground-Penetrating Radar for Archaeological Site Preparation on the Northern Slope of Somma-Vesuvius: A Roman Site, Pollena Trocchia, Italy
No full textThe use of non-invasive geophysical techniques is becoming increasingly important in archaeological site studies as a means to increase the efficiency of excavation and to thereby avoid unnecessary disturbance. Ground-penetrating radar (GPR) surveys were performed over an orthogonal grid in order to guide the decision-making process for planning excavation at a Roman site in Pollena Trocchia (Italy), located just off the NW flank of Somma-Vesuvius. Archaeological planning for this site is complicated by contextual disruption and intermittent backfill, sometimes exacerbated by its proximity to building sites and by its use as a landfill, and by prior archaeological excavation and subsequent remediation. From a geophysical point of view, the site at Pollena Trocchia provided an ideal test-bed for visualization experiments (a) because the ground surface was readily cleared and smoothed by earth-moving machinery and (b) because the soil derived from geologically recent volcanic ash was dry at the time of the survey. State-of-the-art geophysical visualization techniques were applied to the pseudo-3D GPR data using conventional displays, seismic attribute analysis, and waveform connectivity schemes as employed in petroleum exploration. In this way, we assess the value of applying strategies adapted from industrial 3D seismic imaging to the problem of defining the effects of previous disturbance at a complex archaeological site
Preliminary Results of a Ground-Penetrating Radar Study of a Roman Archaeological Site in Pollena Trocchia on the Northern Flank of Mt. Vesuvius.
No full textLong-Life Concrete: How Long Will My Concrete Last? A Synthesis of Knowledge of Potential Durability of Concrete, TPF-5(159), 2013
No full textThere is an ongoing discussion about moving toward performance-based specifications for concrete pavements. This document seeks to move the discussion forward by outlining the needs and the challenges, and proposing some immediate actions. However, this approach may increase risk for all parties until performance requirements are agreed upon and, more importantly, how the requirements can be measured. A fundamental issue behind pavement construction activities is that the owner/designer needs to be assured that the concrete in place will survive for the intended period (assuming there are no changes in the environment or loading) and, therefore, that full payment should be made. At the same time, each party along the supply chain needs to be assured that the material being supplied to them is able to meet the required performance, as is the product/system they are delivering. The focus of this document is a discussion of the issues behind this need, and the technologies that are available, or still needed, to meet this need, particularly from the point of view of potential durabilit
