Moisture condition value test

As mentioned earlier, there is a strong relationship between compaction effort, moisture content and density. 

Percentage passing (%), per sieve Moss required (l g) Mould diameter, mm (type) 

Source Reproduced from CEN EN 13286-2, Unbound and Hydraulically bound Matures, Part 2 Test Methods for the Determination of the Laboratory Reference Density and Water Content-Proctor Compaction, Brussels CEN, 2012. With permission ( CEN). 

The moisture condition value (MCV) test involves testing a soil material at fixed moisture content but by different compaction methods (number of blows or by a vibratory rammer). Thus, the compaction effort beyond which there is no further increase in density is determined. This test is much newer than the proctor test it has been developed in the United Kingdom (Parsons 1992) and is also used by some other countries. 

In fact, the test is carried out for quick acceptance control of materials (soils or stabilised) regarding their natural moisture content for effective compaction. 

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Bulk fill. Lime improvement (partial lime treatment) is used to dry and/or reduce the plasticity of materials, such as silts or clays. It makes such materials more suitable for placing and compacting, whether in landBll or embankments. The Moisture Condition Value (MCV) test [26.11] and [26.13] is used to assess the suitability of a material for handling and compaction. 

CEN EN 13286-46. 2003. Unbound and hydraulically bound mixtures - Part 46 Test method for the determination of the moisture condition value. Brussels CEN. 

Because the mechanical properties of hydrophilic fibers are critically dependent on moisture regain, it is vital that such fibers be tested under constant conditions of temperature and humidity. Standard conditions used in the textile industry are 65% relative humidity and 21°C (1,2,21,96). ASTM D1909, D2118, and D2720 Hst accepted commercial moisture regain values used in the buying and selling of fibers. 

Modified cyclo-olefin thermoset (MCOT) resins are liquids that cure when heated at 150 °C for a minimum of 30 minutes to form the general polymer structure shown in Figure 3.14. The monomers cure by an addition polymerization and, as such, no water or other by-products are evolved. The molecular structures are essentially nonpolar which impart very low moisture absorption properties. For two formulations developed by Johnson-Matthey, water absorptions of 0.05% were recorded when exposed to 85 °C/85% RH conditions for 168 hours. Only 0.1% water absorption was measured even after pressure cooker testing at 150 °C, 85% RH, for 168 hours. These low moisture absorption values make MCOT adhesives and molding... 

Free water only exists when all sites for the adsorption of bound water in the cell wall are filled. This point is called the fiber saturation point (FSP) and all the water added to fibers after the FSP has been reached exists as free water. Thus the total moisture content is the sum of the bound and free water. AAfhen a cellulose fiber remains at a constant relative humidity (RFl) and temperature for a long enough period of time, the proportion of water reaches a steady state known as the equilibrium moisture content (EMC). Test results show that, typically, for small pieces of wood at a constant RH, the EMC is reached in about 14 days [17]. The EMC varies significantly with the somce of the fibers and values for some of the most widely used fibers (at typical ambient conditions of 65% RH and 21°C) are given in Table 15.6. 

Moisture content affects a number of appHcations. The grindabiUty index, ASTM D409, measures the relative ease of pulverising coals and theoretically helps determine the capacity of pulverizers. In practice, low values of grindabiUty occur at moisture extremes and maximal grindabiUty occurs at intermediate moisture content. A small pulverizer to test grinding conditions for design purposes has been developed (20). 

Wire cords are particularly subject to degradation of their adhesion values by moisture. To combat this, halogenated butyl (HIIR) is used in tire innerliners because of its property of low air and water vapor diffusion rates. Moisture is present in most air pumps and many tires are mounted with water left in the tire on mounting. For these reasons tires and tire compounds are tested extensively at simulated aging conditions in the laboratory and on test vehicles before they are sold to the customer. 

A d.c. insulation resistance test or polarization index reveals only the surface condition of the insulation and does not allow a realistic assessment of internal condition. Loss tangent values are true reflections of the insulation condition to detect moisture content, voids, cracks or general deterioration. The tan 5 versus test voltage curve may be drawn and compared with the original curve provided by the manufacturer, and inferences drawn regarding the condition of the insulation. The different starting tan lvalues will reveal the condition of the insulation in terms of amount of contamination, as noted in Table 10.4 (See lEE, Vol. 127, May 1980). 

If it is variable, set the outside air intake quantity to the winter value. Set the desired temperature up to a maximum, leaving the humidity setting alone. It will be appreciated that as the room temperature rises during the heating test the rh tends to fall. However, since the humidity setting remains unaltered the humidifying system will be called upon to operate until at one condition it is working at peak winter rate. Due to the faster characteristic of heaters, the rh will be found to fall but absolute moisture should be found to steadily rise. The duration of the test is normally about 3 h and final conditions should be held for half an hour to prove the moisture source. 

Under steady conditions the plant should be able to hold the design room rh up to the temperature given in psychrometric tables or a chart where the design room rh and test absolute moisture content (kg/kg) coincide. At the end of the test restore the temperature set point to the design value and any control of outside air volume to automatic. Observe that operation. 

Values given are based on results of tests of approximately 50 species of green wood. Values for wood in the air-dried condition (12% moisture content) may be assumed to be approximately of the same magnitude. 

The observed yields in entries 2 and 3 are still a result of the product instability to reagent excesses and work-up conditions. Entries 5 and 6 indicate that when the enolate excess falls below a certain value, the reaction is very slow and incomplete conversion is observed. Entry 8 shows the remarkable effect of water. Here the (+)-DlP-Cl was exposed to atmospheric moisture for one to two seconds simply by removing the stopper of the weighing flask. No aldol product was formed and a 1/1 mixture of 8 and its isomer 54 was observed. The conditions of entry 4 are apparently optimal. However, the reaction is very intolerant of manipulative errors and very narrow limits between stow reaction and product stability are apparent. These conditions brought a benefit. The crude product was found to be stable indefinitely to the reagents and the work-up system. Stability tests of 64a showed no loss in yield even when the mixture was kept at 40 °C. 

Wang and Johnson (2001) reported on test measurement methods that were major indicators of soybean oil quality. These tests included peroxide value, anisidine value, FFA content, phospholipid content, total tocopherol content, oxidative stability index, color, and moisture content. For soybean meal, they reported on urease activity, protein dispersibility index (PDI), rumen bypass or rumen undegradable protein, trypsin inhibitor activity, moisture content, residual oil content, protein content, fiber content, color, amino acid profiles, and protein solubility under alkaline (KOH) conditions. 

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