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When water is mixed with portland cement, the product sets in a few hours and hardens over a period of weeks. These processes can vary widely, depending upon the mix used and the conditions of curing of the product, [18] but a typical concrete sets in about 6 hours and develops a compressive strength of 8 MPa in 24 hours. The strength rises to ...
Concrete is a composite material composed of aggregate bonded together with a fluid cement that cures to a solid over time. Concrete is the second-most-used substance in the world after water, [1] and is the most widely used building material. [2] Its usage worldwide, ton for ton, is twice that of steel, wood, plastics, and aluminium combined. [3]
The chassis was lengthened by 60 centimetres (24 in), which required adding a sixth roadwheel, and widened by 32 centimetres (13 in) to better accommodate the gun while preserving its low silhouette. 15-millimetre (0.6 in) plates formed the front and sides of the open-topped fighting compartment, which was also open at the rear.
The 21 cm Gr 39 Be was a Czech-designed anti-concrete shell fitted with a base fuze, a ballistic cap and the additive sleeve. It was filled with 8.1 kilograms (18 lb) of TNT. There was also an armor-piercing, base-fuzed shell, the 21 cm Pzgr 39 of which little is known other than it had a filling of 2.8 kilograms (6.2 lb) of a PETN/wax mixture. [2]
[1] [2] Scharnhorst and Gneisenau also carried four single MPL C/35 mounts that weighed 26.71 tonnes (26.29 long tons; 29.44 short tons) with armor between 6–2 cm (2.36–0.79 in) thick. Each mount could depress -10° and elevate to 35°; this gave a maximum range of 22,000 metres (24,000 yd).
A sIG 33 auf Panzerkampfwagen I in Greece in 1941. 36 vehicles were organized into independent schwere Infanteriegeschütz-Kompanie (mot.S.) ("self-propelled heavy infantry gun companies") numbers 701–706, assigned to Panzer divisions in the Battle of France [2] as follows: [3]
Initially there were serious issues of weak recoil spring mechanisms that would break, and gun barrel explosions. The problems were solved with the upgrades. [2] A sub variant of the sFH 13 was the lg. 15 cm sFH 13/02 which combined the long barrel with the carriage of the earlier sFH 02 when those guns became obsolete.
The body of the cartridge is wound of a kraft paper of 80–120 g/m 2, which is further covered by an outer sheet of 60–80 g/m 2 with colour and printing. Candy wrapping paper and twisting paper are thin 30–40 g/m 2 kraft papers and are mostly flexo or offset printed. These papers require a good strength, with highly oriented fibers.
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