“…At present, large amounts of wastes containing elemental silicon of sufficiently high purity in the form of a finely dispersed powder have accumulated, which makes the question of their utilization natural [8]. Now, the fields of application of microsilica as a hardening modifier in the production of concrete [9][10][11][12], as well as in the production of dry building mixes, concrete, foam concrete, cement, ceramics, facing slabs, paving slabs, curbs, tiles, refractory masses, rubber, coatings are known.…”