Plastering mortar using high-volume slag and preparation method thereof

Abstract

The invention relates to a plastering mortar using high-volume slag and a preparation method thereof. Every cubic meter of plastering mortar using the high-volume slag comprises the following components in percentage by mass: 16 to 30 percent of ordinary Portland cement, 5 to 10 percent of pulverized fuel ash, 30 to 70 percent of sand, 0 to 30 percent of slag and 1.2 to 3.0 percent of plastering mortar master batch. The preparation method comprises the following steps of: firstly, drying the slag and machine-made river sand respectively until the water content is less than 0.2 percent, sieving the dried slag and machine-made river sand through a 3-millimeter sieve to remove large particles of more than 3 millimeters and feeding the slag and the machine-made river sand into a sand cabin for later use; secondly, metering the selected plastering mortar master batch serving as a raw material according to a mass proportion, fully mixing the materials in a mixing machine for 4 to 6 minutes and feeding the mixture into an additive cabin for later use; and lastly, metering the plastering mortar components according to the mass proportion in a formula and mixing the components in the mixing machine for 3 to 5 minutes so as to obtain a finished product. The slag is used instead of a part of river sand and machine-made sand, so that cost is low, environmental pollution is reduced, and social and economic benefits are remarkable.

Description

technical field [0001] The invention relates to a method for preparing building materials, in particular to a plastering mortar using a large amount of furnace bottom slag and a preparation method thereof. Background technique [0002] Bottom slag is the ash with relatively coarse particle size discharged from the bottom of industrial and civil coal-fired boilers such as thermal power plants and urban central heating systems. It is generally a crushed stone porous structure, and the main component is SiO 2 、Al 2 o 3 and Fe 2 o 3 . The daily output of bottom slag in major power plants and thermal power plants is quite large. Generally, 1 / 3 ton of bottom slag will be produced for every ton of charcoal burned. At present, bottom slag is mostly limited to the reuse of brick and tile factories. These application technologies are relatively It is relatively backward, and the utilization rate of furnace bottom slag is low, which not only pollutes the environment, but also caus...

AI Technical Summary

Problems solved by technology

[0005] Bottom slag is used as a raw material for mortar, which needs to be dried and ground like slag powder, silica fume and zeolite powder. At the same time, due to the porous structure of the bottom slag surface, the water consumption of mortar will increase significantly, which is generally more than the benchmark Mortar (without furnace bottom slag) is more than 50%. This part of the additional water not only changes the water-cement ratio of the mortar, but also affects the water retention rate, compressive strength, and bond strength of the mortar. Therefore, whether it is suitable as a blending material for mortar and how to configure a mortar with practical value requires in-depth research