![]() Understanding Wood: A Craftsman's Guide to Wood Technology (2nd. ed.). ^ An experimental investigation on equilibrium moisture content of earth plasters with natural reinforcement fibres for straw bale buildings Taha Ashour, Heiko Georg, Wei Wu.Moisture Behavior of Slab-On-Ground Structures "A Program to Estimate the Equilibrium Moisture Content of Wood" (PDF). ^ Eleotério, Jackson Roberto Clóvis Roberto Haselein Nestor Pedro Giacomini."Absorption of water by polymers: analysis in terms of a simple model". ^ What is Equilibrium Moisture Content?.Chapter 16: Grain crop drying, handling, and storage. ^ a b Sadakam, Samy Grain Drying Tools: Equilibrium Moisture Content Tables and Psychrometric Charts.This is also important for construction materials such as render reinforced with organic materials, as modest changes in content of different types of straw and wood shavings have a significant influence on the overall moisture content References This affects the rate that buildings need to dry out after construction, typical cements starting with 40-60% water content. typically a fraction of a percent by weight when in equilibrium of air of Relative humidity 10% to 90%. Materials such as stones, sand and ceramics are considered 'dry' and have much lower equilibrium moisture content than organic material like wood and leather. For example, at T=140 deg F, h=0.55, EMC=8.4% from the above equation, while EMC=8.0% from the tabulated data.Įquilibrium moisture content of sands, soils and building materials It is an empirical fit to tabulated data provided in the same reference, and closely agrees with the tabulated data. This equation does not account for the slight variations with wood species, state of mechanical stress, and/or hysteresis. The moisture content ( M) of wood is defined as: The moisture content of wood below the fiber saturation point is a function of both relative humidity and temperature of surrounding air. These values are only approximations since the exact values depend on the specific variety of a grain. The following table shows the equilibriums for a number of grains (data from ). The moisture content that is safe for long-term storage is 12% for corn, sorghum, rice and wheat and 11% for soybean Īt a constant relative humidity of air, the EMC will drop by about 0.5% for every increase of 10 ☌ air temperature. The moisture content of grains is an essential property in food storage. diffusion in stagnant air or convection in moving air).Įquilibrium moisture content of grains The speed with which it is approached depends on the properties of the material, the surface-area-to-volume ratio of its shape, and the speed with which humidity is carried away or towards the material (e.g. The value of the EMC depends on the material and the relative humidity and temperature of the air with which it is in contact. The equilibrium moisture content ( EMC) of a hygroscopic material surrounded at least partially by air is the moisture content at which the material is neither gaining nor losing moisture. ![]() Equilibrium moisture content of wood versus humidity and temperature, according to the Hailwood-Horrobin equation.
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