scholarly journals In situ crack mapping of large-scale self-sensing concrete pavements using electrical resistance tomography

Author(s):  
Sumit Gupta ◽  
Yun-An Lin ◽  
Han-Joo Lee ◽  
Jeff Buscheck ◽  
Rongzong Wu ◽  
...  
2007 ◽  
Vol 24 (2) ◽  
pp. 512-515 ◽  
Author(s):  
Xu Jing-Yu ◽  
Wang Mi ◽  
Wu Ying-Xiang ◽  
H. I Schlaberg ◽  
Zheng Zhi-Chu ◽  
...  

2021 ◽  
Author(s):  
Muhammad Saad Khan ◽  
Abinash Barooh ◽  
Mohammad Azizur Rahman ◽  
Ibrahim Hassan ◽  
Rashid Hasan

Abstract In-situ cutting transport measurement is essential to understand the hydrodynamics and operational parameters required for efficient annulus cleaning. Electrical resistance tomography (ERT) has been a promising method in many industrial applications. This study aimed to provide comprehensive information on the use of a non-invasive ERT method to examine the volume fraction of solids in the presence of non-Newtonian fluid (0.5 wt percent of Flowzan) in a directional drilling annulus (80–90° from vertical orientation). The experiments were performed in a horizontal flow loop system where the annulus segment was 240 (6.16 m) inch long with an inner and outer diameter of 2.5 inches (6.4 cm) and 4.5 inches (11.4 cm), respectively. The results obtained indicated that the ERT device could effectively detect the volume fraction of the solids in the presence of non-Newtonian fluid (Flowzan) under different drilling conditions. Results also showed that the annulus’ successful cleaning was observed with an increase in fluid mass flow rates indicated the relative increase in cuttings volumes (AVF = 7 to 9%). Besides, the rotation of the drill pipe often had a beneficial effect on cutting transport. Furthermore, it was observed that both (30%) eccentricity and inclination (80–85 °) cause a reduction in cutting volume fraction. Therefore, this study will provide an avenue for the industrial implementation of in situ ERT measurement technology in directional drilling operations, particularly in the case of non-Newtonian drilling fluids.


2021 ◽  
Author(s):  
Sridhar Kasu ◽  
Amaranatha Mupireddy ◽  
Nilanjan Mitra

The state of research on narrow and non-dowel short jointed paneled concrete pavements (SPCP) is gaining attention on a large scale across the different parts of the world especially in Chile, the USA, and India. The jointed plain concrete pavements (JPCP), which are designed with slab sizes around 3.5 m x 4.5 m results in thicker slabs with a thickness of paving quality concrete (PQC) layer ranging from 280-330 mm depending on load and temperature stresses on Indian highways. In addition to thicker slabs, JPCP requires dowelled joints, which increases the initial cost of pavement. In order to reduce the thickness and initial cost of construction, the use of cast-in-situ SPCP laid on a strong foundation consisting of a dry lean concrete (DLC) base, cement treated sub base (CTSB) and subgrade is being studied. The square short slabs of size: 1 m, 1.5 m and 2 m joint spacing and of thickness 180 to 220 mm were designed and constructed as two full-scale test sections of SPCP on national highways (NH-2 and NH-33) in India. Slabs were constructed by introducing an initial vertical saw-cut of 3 to 5 mm wide and to a depth of 1/4th to 1/3rd of the thickness. The adopted construction practices through field demonstration and implication of SPCP for highways is the main thrust of the paper which helps the practitioners, designers for adopting such projects in the future.


2018 ◽  
Vol 23 (suppl_1) ◽  
pp. e16-e16
Author(s):  
Ahmed Moussa ◽  
Audrey Larone-Juneau ◽  
Laura Fazilleau ◽  
Marie-Eve Rochon ◽  
Justine Giroux ◽  
...  

Abstract BACKGROUND Transitions to new healthcare environments can negatively impact patient care and threaten patient safety. Immersive in situ simulation conducted in newly constructed single family room (SFR) Neonatal Intensive Care Units (NICUs) prior to occupancy, has been shown to be effective in testing new environments and identifying latent safety threats (LSTs). These simulations overlay human factors to identify LSTs as new and existing process and systems are implemented in the new environment OBJECTIVES We aimed to demonstrate that large-scale, immersive, in situ simulation prior to the transition to a new SFR NICU improves: 1) systems readiness, 2) staff preparedness, 3) patient safety, 4) staff comfort with simulation, and 5) staff attitude towards culture change. DESIGN/METHODS Multidisciplinary teams of neonatal healthcare providers (HCP) and parents of former NICU patients participated in large-scale, immersive in-situ simulations conducted in the new NICU prior to occupancy. One eighth of the NICU was outfitted with equipment and mannequins and staff performed in their native roles. Multidisciplinary debriefings, which included parents, were conducted immediately after simulations to identify LSTs. Through an iterative process issues were resolved and additional simulations conducted. Debriefings were documented and debriefing transcripts transcribed and LSTs classified using qualitative methods. To assess systems readiness and staff preparedness for transition into the new NICU, HCPs completed surveys prior to transition, post-simulation and post-transition. Systems readiness and staff preparedness were rated on a 5-point Likert scale. Average survey responses were analyzed using dependent samples t-tests and repeated measures ANOVAs. RESULTS One hundred eight HCPs and 24 parents participated in six half-day simulation sessions. A total of 75 LSTs were identified and were categorized into eight themes: 1) work organization, 2) orientation and parent wayfinding, 3) communication devices/systems, 4) nursing and resuscitation equipment, 5) ergonomics, 6) parent comfort; 7) work processes, and 8) interdepartmental interactions. Prior to the transition to the new NICU, 76% of the LSTs were resolved. Survey response rate was 31%, 16%, 7% for baseline, post-simulation and post-move surveys, respectively. System readiness at baseline was 1.3/5,. Post-simulation systems readiness was 3.5/5 (p = 0.0001) and post-transition was 3.9/5 (p = 0.02). Staff preparedness at baseline was 1.4/5. Staff preparedness post-simulation was 3.3/5 (p = 0.006) and post-transition was 3.9/5 (p = 0.03). CONCLUSION Large-scale, immersive in situ simulation is a feasible and effective methodology for identifying LSTs, improving systems readiness and staff preparedness in a new SFR NICU prior to occupancy. However, to optimize patient safety, identified LSTs must be mitigated prior to occupancy. Coordinating large-scale simulations is worth the time and cost investment necessary to optimize systems and ensure patient safety prior to transition to a new SFR NICU.


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