Fineness modulus
Translation- Fineness modulus
Fineness modulus is a measurement of the coarseness or fineness of a given
aggregate .For a fine aggregate, FM is calculated from the cumulativepercentages of aggregate retained on sieves No.4,8, 16,30, 50, 100, 3/8in., 3/4in., 1.5in., 3in., and 6in., divided by 100
The Fineness Modulus should be between 2.3 and 3.1.
FM is an index of the fineness of an aggregate-the higher the FM the coarser the aggregate. Different aggregate grading may have the same FM. FM of fine aggregate is useful in estimating proportions of fine and coarse aggregates in concrete mixtures.
The effect of the Fineness Modulus on the quality of concrete was first studied systematically by
Duff Abrams .
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fineness modulus — модуль крупности (зёрен) … Англо-русский словарь строительных терминов
Abram's fineness modulus — модуль крупности (песка, заполнителей) … Англо-русский словарь строительных терминов
Duff Abrams — Duff A. Abrams (1880, Illinois, – 1965, New York) was an American researcher in the field of composition and properties of concrete. He developed the basic methods for testing concrete characteristics still in use today. A professor with the… … Wikipedia
factor — 1) коэффициент; множитель || разлагать на множители 2) фактор 3) показатель • to factor out выносить за скобки factor of earthing коэффициент заземления factor of merit 1. критерий качества 2. добротность factor of proportionality коэффициент… … Англо-русский словарь технических терминов