Abstract: The present invention relates to cement compositions including both mortars and concretes and methods of making such compositions. The invention further concerns the discovery that mortars and concretes can be obtained with improved properties by including in their composition an aggregate filler ingredient which has been pretreated by an acidizing and de-acidizing process.

Abstract: An air scrubber has inner and outer concentric annular chambers separated by a common wall and an inlet to the outer chamber and an outlet from the inner chamber. The chambers connect together at one end of the scrubber, and a fan draws air from the outer chamber and forces it out through the inner chamber. The common wall has a circulation opening and the scrubber contains a quantity of liquid circulated through the chambers and the fan to spray through the opening in the common wall to mix with incoming air, to pass through the fan as a finely divided mist, and to return to the opening. Scrubbing liquid is input periodically and output through a preferably adjustable output opening to regulate the quantity of liquid circulated through the scrubber by the fan. Aerosol eliminator openings along the air outlet passageway aid in removal of any liquid aerosol still entrained in the output air.

Abstract: Paper, cardboard, thin wood chips, and other feltable, non-flowable and generally laminar materials are stored in a silo and supported by generally parallel beams at a level above a base platform. The material mats together and is self-supporting in a general arch shape between the beams and is removed from the silo by lowering the beams one at a time to lower a portion of the material while the rest of the material is self-supporting in a general arch shape upheld by beams other than the lowered beam. Lowered material is moved off the base platform and out from under the self-supporting material above, the lowered beam is raised to its original level, then another beam is lowered to repeat the process indefinitely.

Abstract: A high viscosity material mixer-refiner having a cylindrical stator shell and rotor has improved refining surfaces on the rotor and stator. These are formed of interchangeable blocks held in place on the rotor and the stator with the blocks having teeth oriented in different aspects to the relative motion between the rotor and the stator. The teeth are preferably raised bars with orientations for advancing or retarding material. The blocks are arranged in desired patterns to accomplish optimum mixing and refining.