optimum moisture content


Also found in: Acronyms.

optimum moisture content

[′äp·tə·məm ′mȯis·chər ‚kän‚tent]
(geology)
The water content at which a specified compactive force can compact a soil mass to its maximum dry unit weight.

optimum moisture content

That content of water in soil at which the maximum dry unit weight can be attained as a result of a given compaction effort.
References in periodicals archive ?
Property Range Material passing sieve number 200 (%) >90 Liquid limit (%) 130-150 Plastic limit (%) 60-70 Plasticity index (%) 70-80 Maximum dry density (kN/[m.sup.3]) 11.5-12.0 Optimum moisture content (%) 32-40 Swell percent (ASTM D4546) (%) 16-18 Swelling pressure (ASTM D4546) at 500-800 a density of 12.0 kN/[m.sup.3] (kN/[m.sup.3])
--Due to chemical reaction between contaminant and soil particles, soil becomes more plastic in nature which causes a decrease in maximum dry unit weight and an increase in optimum moisture content. A corresponding decrease in unconfined compressive strength of contaminated soils was also observed.
On the other hand, the optimum moisture content of soil increases with the increase of fly ash content as more water is required for the formation of the lime-like product, Ca[(OH).sub.2], and dissolution of this product into [Ca.sup.2+] and O[H.sup.-] ions, in order to supply more [Ca.sup.2+] ions for the cation exchange reaction.
of dry Density, Standard compaction 1.682 ([[rho].sub.d.Max]) Modified compaction 1.785 (gm/[cm.sup.3]) Optimum Moisture Content, Standard compaction 13.6% %(O.M.C) Modified compaction 11.0% Relative Density, [[rho].sub.d.min], 1.485 %([D.sub.t]) (gm/[cm.sup.3]) [[rho].sub.d.max], 1.706 (gm/[cm.sup.3]) [e.sub.max] 0.795 [e.sub.min] 0.562 %[D.sub.t] 59.5% Direct Shear Test [phi], degree 32[degrees] c, kPa 0 Table 2.
For this reason, optimum moisture content for composting of bedding and beef cattle manure mixtures collected from bedded pack barn was evaluated using respiration method.
The optimum moisture content (OMC) and maximum dry density (MDD) were derived from the dry densities and corresponding water contents curves shown in Figure 4.
The basic properties of test materials for fine grain soils are presented in Table 1, including liquid limit (LL), plastic index (PI), the specific density, the maximum dry unit weight, and the optimum moisture content (OMC).
After some initial testing to find the optimum moisture content of the PBT needed to make non-brittle parts consistently, PTC was able to mold parts that were virtually 100% defect-free and passed the fracture test.
Effect of Polymer Content on Optimum Moisture Content. Optimum moisture content (OMC) is increased with increase in polymer content.
Once pavement material is subjected to excess water that pushes it beyond optimum moisture content, the base of the pavement structure becomes soft and unstable.
The table 1 indicated that the density and natural moisture content of kaolinte submitted to thermal almost is constant and the optimum moisture content from applying 100[degrees]C strongly increased and could observe of increasing imperviously when this submitted to the thermal.
The moisture and strength curves show that exceeding the optimum moisture content for strength leads to dramatically reduced unconfined compressive strengths.

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