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Shotcrete application
Published in Dudley Robert (‘Rusty’) Morgan, Marc Jolin, Shotcrete, 2022
Dudley Robert (‘Rusty’) Morgan, Marc Jolin
Expanded metal lath is a useful adjunct to the shotcrete process. It can be used as an alternative to conventional plywood or other types of forms. It is particularly useful in construction of structures where the shotcrete can be applied from both sides of the lath, such that it becomes an integral part of the reinforcing in the shotcrete structure. Examples of its use include:Bulkheads in construction of structural shotcrete walls and other structural shotcrete elements;Construction of tunnel portals, in conjunction with the use of lattice girders and conventional reinforcing steel. See Figure 9.11 (Hart, 2008);Construction of backfill barricades and ventilation seals in mines;Repair of curved structures such as bulk storage silos (Hart, 2008); andConstruction of complex curved structures such as bobsleigh/luge tracks and water chutes in water parks. See Section 10.7 (ASA, 2008).
Materials
Published in Roy Chudley, Roger Greeno, Karl Kovac, Chudley and Greeno’s Building Construction Handbook, 2020
Roy Chudley, Roger Greeno, Karl Kovac
Non porous backgrounds such as steel or glazed surfaces require application of a bonding agent to improve plaster adhesion. A wire mesh or expanded metal surface attachment may also be required with metal lathing plaster as the undercoat.
What are architectural building systems?
Published in Samuel L. Hurt, Building Systems in Interior Design, 2017
Before the 1950s, most applied ceilings would have been Portland cement plaster (or lime plaster before the middle of the 19th century) on wood or expanded metal lath. In residential construction, the lath is likely to be narrow wood boards, about ⅜″ apart, nailed directly to the wood ceiling joists or wood rafters; in commercial construction, the lath is likely to be metal attached directly to the same type of framing. The plaster would have been done in three coats—scratch coat, brown coat, and finish coat—adding up to roughly ⅞″ in thickness, and the surface would probably have been very smooth for final painting or wallpapering. This system can be highly durable, although there is a tendency for the plaster to break away from wood lath over time. Also, it is very difficult to put nails into plaster like this.
A virtuous cycle in materials engineering and surface finishing: design-print-image
Published in Transactions of the IMF, 2020
F. C. Walsh, L. F. Arenas, C. Ponce de León
The concept of 3D printed, tailored porous metal electrodes was thus introduced in a short communication,32 featuring the averaged mass transport characteristics of hexagonal packed cells of 1.8 mm in diameter. The 24 cm2 stainless steel electrode was coated with nickel, as indicated in Section 5. Limiting currents for the reduction of ferricyanide ion were determined over mean linear flow rates between 1.0 and 6.3 cm s−1 using linear polarisation and chronoamperometry in a flow cell derived from the 3D printed model shown in Figure 3(b). The work served to establish the feasibility of tailoring the volumetric mass transport coefficient, kmAe, of the porous electrodes by controlling their surface morphology and surface area. For this particular electrode, the kmAe values were similar to an expanded metal mesh, although metal foam and grid analogues can also be produced.
Establishment of correlations for the thermo-hydraulic parameters due to perforation in a multi-V rib roughened single pass solar air heater
Published in Experimental Heat Transfer, 2023
Varun Pratap Singh, Siddharth Jain, Ashwani Kumar
To obtain an optimal combination of roughness forms and parameters, thermodynamic correlations for SAH were developed by various research scholars. Saini and Saini [32] developed correlations for expanded metal mesh roughened ducts, while Varshney and Saini [33] developed correlations and conducted numerical studies for SAH packed with wire mesh. Both observed significant improvement in THP. Singh et al. [34] established correlations for Nu and f for discrete V-down ribs of roughness installed in SAH. The optimum values of Nu and f were observed to be 3.04 and 3.11 times higher as compared to smooth SAH, respectively. Hans et al. [35] developed correlations for SAH having multiple v-rib roughnesses, the highest values of Nu and f being determined as 6 and 5 times higher as compared to the smooth SAH. The optimum THP was obtained at W/w = 6, whereas the highest f observed at W/w = 10 at α = 60°. Saini and Verma [36] derived correlations for THP for SAH having dimple-shape roughness and improvement in Nu and f values observed as 7.58 and 4.68 times as compared to the smooth channel. Saini and Saini [37] conducted experimental and numerical studies on SAH and developed correlations for Nu and f for SAH with arc-shaped wire roughness and found an improvement of 3.8 times and 1.75 times as compared to smooth SAH. Sethi et al. [38] developed correlations for artificially roughened SAH with dimpled shape roughness and significant improvement in THP. Chamoli and Thakur [39] derived correlations for SAH with perforated baffles having V-shape roughness, while Kumar et al. [40] developed correlations of THP characteristics for 3-sided roughened SAH and Hans et al. [41] derived correlation function for SAH roughened with broken-arc ribs. All three observed improved THP as compared to smooth SAH.
Applying a new systematic fuzzy FMEA technique for risk management in light steel frame systems
Published in Journal of Asian Architecture and Building Engineering, 2022
Ali Yeganeh, Moein Younesi Heravi, Seyed Behnam Razavian, Kourosh Behzadian, Hashem Shariatmadar
DFI obtained minimum value of SED among all the risks. After removing improper responses to risk strategies, the best solution for this risk (has minimum value of SED) is “using expanded metal lath with white mortar cement (UEMLMC)” instead of dry façade as shown in Figure 13. To use this solution, the expanded metal lath should be screwed to studs and runners (panel (a) and (b) in Figure 13) and then white (or other colours) mortar cement covers all the metal lath and thus a flat white surface will be obtained (panel (c) in Figure 13).