In the United States, a standard dump truck has one front steering axle, and one or two rear axles which typically have dual wheels on each side. Tandem rear axles are virtually always powered in the U.S., far less often in Europe.
A silicate is a compound containing an anionic silicon compound. The great majority of silicates are oxides, but hexafluorosilicate ([SiF 6 ] 2â) and other anions are also included. Orthosilicate  is the anion SiO 4 4â or its compounds.Related to orthosilicate are families of anions (and their compounds) with the formula [SiO 2+n ] 2nâ .he great majority of silicates are oxides, but hexafluorosilicate ([SiF 6 ] 2â) and other anions are also included.  Orthosilicate  is the anion SiO 4 4â or its compounds. Related to orthosilicate are families of anions (and their compounds) with the formula [SiO 2+n ] 2nâ .
Sodium silicate is a silicon-oxygen polymer containing ionic sodium (Na+) components. Such a molecular arrangement is different from typical ionic materials such as salt, which is based on formula units united by electrical attraction.