Abstract: Test apparatus for testing porous material such as used in roadway base or building foundations may be deployed in the field at various test sites. The test apparatus includes electrodes that contact the porous material under test and a sensor unit that supplies electromagnetic signals to the porous material. Response signals reveal electrical parameters such as complex impedance which can be equated to material properties such as density and moisture content. Reference may be made to empirical correlations made in laboratory tests using the same test apparatus to enable the effects of the test apparatus on the measurement to be accounted for. The electrodes may include flexible coplanar electrodes that reduce air gaps when in contact with the porous material.

Abstract: Test apparatus for testing porous material such as used in roadway base or building foundations may be deployed in the field at various test sites. The test apparatus includes electrodes that contact the porous material under test and a sensor unit that supplies electromagnetic signals to the porous material. Response signals reveal electrical parameters such as complex impedance which can be equated to material properties such as density and moisture content. Reference may be made to empirical correlations made in laboratory tests using the same test apparatus to enable the effects of the test apparatus on the measurement to be accounted for. The electrodes may include flexible coplanar electrodes that reduce air gaps when in contact with the porous material.

Abstract: A wood-burning stove includes side-walls joined together in an airtight manner to form a firebox and a heat chamber there above. The firebox in this wood-burning stove is a drawer on rollers/sliders and pulls out for ease of placing fuel exactly where the operator wants it and severely decreases the risk of injury or burning. This is accomplished by not having to place the fuel into the enclosed cavity of the wood-burning stove increasing risk of injury and decreasing the accuracy of where you would like to place the fuel in the firebox. In addition there are knobs that control the airflow into the firebox that controls the combustion giving the operator control over the temperature in the firebox and allows the fuel to burn more efficiently.