Surface layer mortar, grindstone, board and preparation method of grindstone and board

Abstract

The invention discloses surface layer mortar, grindstone, a board and a preparation method of the grindstone and the board, and relates to the technical field of stone materials. The surface layer mortar is prepared from the following components in percent by mass: 20-45% of cement, 55-67% of aggregate, 0-5.4% of nanometer silica fume, 0-6.5% of mineral powder, 2-3% of dispersible rubber powder, 0-0.2% of a retarder, 0.1-0.3% of a coagulant, 0.1-0.3% of a water reducing agent, 0.05-0.3% of a defoaming agent, 0.01-0.02% of a thickening agent and 2-3% of pigment; the cement comprises high belitesulfoaluminate cement and optional ordinary cement, wherein the mass of the high belite sulfoaluminate cement accounts for 20-100% of the mass of the cement; and the water-material ratio of the surface layer mortar is 0.08-0.1. The fluidity, breaking and compressive strength and free expansion rate of the surface layer mortar meet related index requirements; and the grindstone or board prepared by adopting the surface layer mortar is small in size shrinkage, does not deform, does not crack, and has no alkali efflorescence.

Description

technical field [0001] The invention relates to the technical field of stone materials, in particular to a surface layer mortar, a grinding stone, a board and a preparation method thereof. Background technique [0002] With the depletion of natural stone resources and the influence of green, coordinated, sustainable development and environmental protection orientation, artificial terrazzo floor and decorative board materials have attracted more and more attention from the society due to their advantages of safety, fire prevention, durability and high cost performance. recognized. [0003] At present, there are several forms of floor grinding stone and decorative board materials on the market: one is based on organic epoxy resin materials, polyurethane resin materials, etc., and the other is based on (white) Portland cement or sulfur aluminum Salt cement and aluminate cement are used as inorganic cementitious materials, and there is another kind that is compounded by adding ...

AI Technical Summary

Problems solved by technology

[0005] 1. Although the floor grindstone or decorative board made of organic resin materials has good strength and bright color, the production process has a certain smell, poor safety, and poor environmental protection; at the same time, when used outdoors, the weather resistance is poor and the price is high. be popularized and applied

[0006] 2. Use (white) Portland cement or sulphoaluminate cement, aluminate cement materials to make floor grinding stones or prefabricated panels. Because of its controllable cost and better durability than organic materials, it has won a lot of attention in the market. A certain degree of promotion, but the floor grindstone or prefabricated boards produced have large size deformation and shrinkage, are easy to crack and warp, and are easy to return to alkali, so they are only suitable for some low-end ground applications, and it is difficult to use them on commercial floors or Comprehensive promotion in the field of decorative panels

[0007] 3. The composite cement system is based on a single cement as the cementitious material, and is compounded with other materials. The floor grinding stone or decorative plate produced improves the deformation to a certain extent, but its expansion stability period is long, the late deformation is large, and the raw material The procurement is uncontrollable, and only solves the deformation problem in the early period of time, and the phenomenon of cracking in the later stage is not uncommon

At the same time, raw materials vary greatly from place to place, and the performance of the millstones and decorative plates produced is even more different, which is impossible to control, which greatly increases the difficulty of production and operation for practitioners.

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