Glass and metallurgical wastes in facing ceramics production

Purpose: The aim of this work is facing ceramic brick production using glass and metallurgical wastes. Methodology: Compressive strength, density, water absorption testing. Findings: The facing ceramic specimens are obtained at a 1050 °C baking temperature by using a mixture consisting of 40 % clay and 60 % broken glass. The operating modes for the laboratory specimen fabrication are selected such that they possess 2064 kg/m3 density and 42.24 MPa compressive strength. The specimens are characterized by the formation of close pores.

Numerical and Experimental Evaluation of a CFRP Fatigue Strengthening for Stringer-Floor Beam Connections in a 19th Century Riveted Railway Bridge

A local and global finite element analysis of the stringer-floor beam connection of a 19th century riveted railway bridge in Spain made of puddle iron were performed to obtain the maximum principal strains in the riveted connecting angles corresponding to bending moments from train loading on the bridge. Due to the anisotropic nature of puddle iron, the connecting angles were modelled using Hill anisotropic plasticity potential and a parametric study in the local FE model of the connection was performed. A laboratory specimen fabricated with original stringers dismantled from the railway bridge was tested to calibrate the numerical models, so the yield stress ratio that best fitted experimental results was obtained. Based on the method of constant fatigue-life diagram and modified Goodman fatigue failure criterion, it was detected that the connecting angles were prone to fatigue crack initiation, as the combination of mean stress and alternating stress amplitude at the toe of the angle fillet remained outside the infinite fatigue-life region. An innovative strengthening system based on adhesively-bonded carbon-fiber reinforced polymer (CFRP) angles was designed to prevent fatigue crack initiation in the connecting angles of the stringer-floor beam connection. Different CFRP laminate layouts were numerically evaluated and a proper configuration was obtained that reduced both the mean stress and the alternating stress amplitude in the connecting angle to shift from finite fatigue-life region to infinite fatigue-life region in the constant fatigue-life diagram. To validate the effectiveness of the proposed CFRP strengthening method, its application on a second laboratory specimen fabricated with original stringers was evaluated experimentally and compared with numerical results. The research study conducted showed that the use of adhesively-bonded CFRP angles was an effective strengthening system in reducing the stress level in the fillet region of the puddle iron connecting angles (where fatigue cracks are prone to initiate) and consequently could increase fatigue life of the stringer-floor beam connection.

In-laboratory breast specimen radiography reduces tissue block utilization and improves turnaround time of pathologic examination

Background This study was performed to determine whether in-laboratory specimen radiography reduces turnaround time or block utilization in surgical pathology. Methods Specimens processed during a 48-day trial of an in-lab cabinet radiography device (Faxitron) were compared to a control group of specimens imaged in the mammography suite during a prior 1-year period, and to a second group of specimens not undergoing imaging of any type. Results Cases imaged in the mammography suite had longer turnaround time than cases not requiring imaging (by 1.15 days for core biopsies, and 1.73 days for mastectomies; p < 0.0001). In contrast, cases imaged in-lab had turnaround time that was no longer than unimaged cases (p > 0.05 for core biopsies, lumpectomies and mastectomies). Mastectomies imaged in-lab required submission of fewer blocks than controls not undergoing any imaging (mean reduction of 10.6 blocks). Conclusions Availability of in-lab radiography resulted in clinically meaningful improvements in turnaround time and economically meaningful reductions in block utilization.

In-laboratory breast specimen radiography reduces tissue block utilization and improves turnaround time of pathologic examination

Background This study was performed to determine whether in-laboratory specimen radiography reduces turnaround time or block utilization in surgical pathology. Methods Specimens processed during a 48-day trial of an in-lab cabinet radiography device (Faxitron) were compared to a control group of specimens imaged in the mammography suite during a prior one-year period, and to a second group of specimens not undergoing imaging of any type. Results Cases imaged in the mammography suite had longer turnaround time than cases not requiring imaging (by 1.15 days for core biopsies, and 1.73 days for mastectomies; p < 0.0001). In contrast, cases imaged in-lab had turnaround time that was no longer than unimaged cases (p > 0.05 for core biopsies, lumpectomies and mastectomies). Mastectomies imaged in-lab required submission of fewer blocks than controls not undergoing any imaging (mean reduction of 10.6 blocks). Conclusions Availability of in-lab radiography resulted in clinically meaningful improvements in turnaround time and economically meaningful reductions in block utilization.

Technological Control Assessment and Concrete Receiving

With the growth in the area of ​​construction, a greater demand is obtained from both the consumer and the current standards, due to this there is the need for a refined assessment on the process of technological control of concrete. Concrete is one of the most important materials in construction, this material is the most tested and properly controlled, thus bringing the need for the development of this article. Upon receiving the concrete on site, according to the NBR technical standard [1], a series of conferences and preliminary test were analyzed, from which there is the first evaluation of the material in the fresh state, with the slump test, to deepen the Diagnosis of concrete evaluation A laboratory was hired to perform tests and ensure quality and reliability. In the laboratory, specimen ruptures were made through the compressive strength test, which is essential for the final verification of structural strength. The objective of this study is to evaluate the technological control of the concrete, focusing on the process of receiving, molding of the specimens and rupture in the hardened state, thus making it difficult to appear any failure, whether due to non-conformity in the process, the verification of the service resistance required or due to some tribulation in the constitution of the elements produced by the concrete, work or laboratory. This research took place particularly in a venture, located in the city of Manaus, addressing hypotheses and theses verifying their veracity about the changes in the results demanded, making clear the ways to improve the dissertated methodology.