Todd S. Rushing, Ghassan Al-Chaar, Brian Andrew Eick, Jedadiah Burroughs, Jameson Shannon, Lynette Barna and Michael Case
This paper aims to qualify traditional concrete mixtures for large-scale material extrusion in an automated, additive manufacturing process or additive construction.
Abstract
Purpose
This paper aims to qualify traditional concrete mixtures for large-scale material extrusion in an automated, additive manufacturing process or additive construction.
Design/methodology/approach
A robust and viable automated additive construction process must be developed that has the capability to construct full-scale, habitable structures using materials that are readily available near the location of the construction site. Accordingly, the applicability of conventional concrete mixtures for large-scale material extrusion in an additive construction process was investigated. A qualitative test was proposed in which concrete mixtures were forced through a modified clay extruder and evaluated on performance and potential to be suitable for nozzle extrusion typical of additive construction, or 3D printing with concrete. The concrete mixtures were further subjected to the standard drop table test for flow, and the results for the two tests were compared. Finally, the concrete mixtures were tested for setting time, compressive strength and flexural strength as final indicators for usefulness in large-scale construction.
Findings
Conventional concrete mixtures, typically with a high percentage of coarse aggregate, were found to be unsuitable for additive construction application due to clogging in the extruder. However, reducing the amount of coarse aggregate provided concrete mixtures that were promising for additive construction while still using materials that are generally available worldwide.
Originality/value
Much of the work performed in additive manufacturing processes on a construction scale using concrete focuses on unconventional concrete mixtures using synthetic aggregates or no coarse aggregate at all. This paper shows that a concrete mixture using conventional materials can be suitable for material extrusion in additive construction. The use of conventional materials will reduce costs and allow for additive construction to be used worldwide.
Details
Keywords
This chapter explores the development of the dangerous, sexualized fembot archetype in science-fiction film and television, drawing a line from the robot Maria in Fritz Lang's…
Abstract
This chapter explores the development of the dangerous, sexualized fembot archetype in science-fiction film and television, drawing a line from the robot Maria in Fritz Lang's Metropolis (1927) to contemporary versions of the archetype.
Primarily, this chapter outlines how this historically villainous trope has been augmented and redefined in twenty-first Century posthuman science-fiction texts Ex Machina (Alex Garland, 2014) and Westworld (Joy et al., 2016 –). Both feature fembot characters who are central to the narrative, and can be defined as both villainous at times, but who also occupy the position of arguable sympathetic protagonists. In part, this redefinition can be argued as more a reflection of a Western hegemonic shift towards feminist values. Nevertheless, there have been criticisms of the male gaze present in both and of the emphasis on female suffering.
As oblique texts for an 18–35 audience, both Ex Machina and Westworld ask more questions than they answer. Through textual analysis and with reference to relevant scholarship, this chapter considers the impact of audience and institution on representation, the interplay between genre conventions and the presentation of the archetype as well as a considering how both offer different treatment of intersectional androids.