what is the purpose of a treble clef
Clef Among the instruments that use treble clef are the violin, flute, oboe, bagpipe, cor anglais, all clarinets, all saxophones, horn, trumpet, cornet, vibraphone, xylophone, mandolin, recorder; it is also used for the guitar, which sounds an octave lower than written, as well as the euphonium and baritone horn, both of which sound a major ninth lower. Treble clef is the upper stave of the grand stave used for harp and keyboard instruments. It is also sometimes used, along with tenor clef, for the highest notes played by bass-clef instruments such as the cello, double bass (which sounds an octave lower), bassoon, and trombone. The viola also sometimes uses treble clef for very high notes. Treble clef is used for the soprano, mezzo-soprano, alto, contralto and tenor voices. The tenor voice sounds an octave lower, and is often written using an octave clef (see below) or double-treble clef.
Portland cement Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium silicates, (3 CaO·SiO2, and 2 CaO·SiO2), the remainder consisting of aluminium- and iron-containing clinker phases and other compounds. The ratio of CaO to SiO2 shall not be less than 2.0. The magnesium oxide content (MgO) shall not exceed 5.0% by mass.