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A cement accelerator is an admixture for the use in concrete, mortar, rendering or screeds. The addition of an accelerator speeds the setting time and thus cure time starts earlier. [ 1 ] This allows concrete to be placed in winter with reduced risk of frost damage. [ 2 ]
Below is a comprehensive drill and tap size chart for all drills and taps: Inch, imperial, and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.
[57] [58] Masonry drill bits and standard expandable wall plugs are not suitable for use with AAC blocks. [58] Using European standard density (400 kg/m 3, B2,5), AAC blocks alone would require very thick — 500mm or thicker — walls to achieve the insulation levels required by newer building codes in Northern Europe. [55]
Albrecht Mortar German Empire: World War I 254: 10-inch siege mortar M. 1841 United States: 1841 254: 10-inch seacoast mortar M. 1841 United States: 1841 260: 26 cm Minenwerfer M 17 Austria-Hungary: World War I 320: 320 mm Type 98 mortar Japan: World War II: 325: Mortier de 12 Gribeauval Kingdom of France: 1781 330: 13-inch seacoast mortar M ...
[1] This emphasis on siege warfare led to many developments in the use and design of artillery. Fortifications were vulnerable to vertical trajectory or plunging fire , and the concept of mortars was well understood, but large-scale mortars were initially used only to provide close support for infantry assaults on fortified positions.
Naval live-fire exercises may use anti-ship missiles and torpedoes, although tests involving air-to-air and air-to-surface missiles, guns and bombs are not uncommon. Navies conduct live-fire exercises to test elements of an integrated defense system, such as the US Aegis ; namely, its ability to track and destroy enemy anti-ship missiles .
The kurzer 8 cm Granatwerfer 42 (kz 8 cm GrW 42) was a mortar used by Germany during World War II. It was developed as a lightened version of the standard German 8 cm GrW 34 medium mortar with a shorter barrel for use by paratroopers, but replaced the ineffective 5 cm leGrW 36 as that weapon's shortcomings became apparent.
Traverse is limited to 18°, while elevation ranges from +45 to +65°. [ 2 ] [ 3 ] The sights, elevation and traverse gears are on the left side of the barrel. The mortar is normally towed, at a maximum speed of 40 km/h (25 mph), muzzle first by an AT-P, AT-L or AT-S tractor, which also carries the 11-man crew.