초록 ▼

A building material plate formed by compression in the hydration-water moist state and having quality features resembling asbestos-reinforced cement and made of an asbestos-free material mixture having up to 30 vol. % of cellulose fiber proportions in the high-packed state of a diameter spectrum DC,

A building material plate formed by compression in the hydration-water moist state and having quality features resembling asbestos-reinforced cement and made of an asbestos-free material mixture having up to 30 vol. % of cellulose fiber proportions in the high-packed state of a diameter spectrum DC, singly bound into a hydration binder particle mixture still present in the moist forming state of a grain size-main distribution spectrum Do within the ratio range 0.9≤DC/Do≤1.1, which in case of a participation of cement in the binder contains special additives showing a pozzuolana reaction for securing constancy in longterm quality.

대표청구항 ▼

A method of making an asbestos-free building material plate, comprising the steps of: (a) mechano-pneumatically mixing in a substantially dry state, fiber reinforcing materials comprising mainly cellulose fibers with binder particles comprising cement, the ratio of diameters of the cellulose fibers

A method of making an asbestos-free building material plate, comprising the steps of: (a) mechano-pneumatically mixing in a substantially dry state, fiber reinforcing materials comprising mainly cellulose fibers with binder particles comprising cement, the ratio of diameters of the cellulose fibers when air dry to the diameters of the binder particles being between 0.9 and 1.1 and the ratio of the diameters of the cellulose fibers when water swollen to the diameters of the binder particles being between 1.1 and 1.35, the mixing being continued until a quasi-homogeneous uniform distribution of components is achieved; (b) densifying said quasi-homogeneous mixture to the extent possible by removing surplus air resulting from said mixing; (c) subjecting said densified mixture to a weakly turbulent mechano-pneumatic suspending steam/rolling mixture with water mist present in at least an amount sufficient that the weight ratio of water to cement can subsequently be adjusted to between 0.375 and 0.45 in subsequent operations, the amount of water being limited by the amount which would create a possibility of dehomogenizing the mixture during trickle charging in a subsequent forming assembly; (d) preforming the mixture of step (c) depending on the desired utilization of the building materials, either compressed in its dense packed form or joggled and slightly compressed only in a calibrating mode by allowing cavities resulting from the mixture, with adjustment of the weight ratio of water to cement to between 0.375 and 0.45.