Manufacturing method for powder ash air-entrained concrete blocks

Abstract

The invention relates to a manufacturing method for powder ash air-entrained concrete blocks. The manufacturing method comprises the following steps: I, weighing raw materials, wherein the raw materials comprise the following components in parts by mass: 480-560 parts of quick lime, 2750-2850 parts of coal ash slurry, 35-45 parts of cement and 2.3-2.7 parts of a powdered aluminum liquid; (II), preparing mixed slurry: namely feeding the coal ash slurry, cement, a cementing agent and powdered aluminum into a stirrer, adding the cement and quick lime and stirring the mixture for 180-220 seconds, adding the powdered aluminum and stirring the mixture for a time less than 30 seconds to form the mixed slurry; III, pouring and degassing: namely pouring the mixed slurry into a die trolley to degas; IV, resting: namely resting the die trolley at 40-45 DEG C to form blanks; V, cutting: namely cutting the blank in steps; and VI, carrying out autoclaved curing: namely vacuumizing the blanks in an autoclave, raising the pressure when the pressure is not greater than 0.06MPa, maintaining the pressure when the pressure is 1.1-1.2MPa and reducing the pressure within 5.5 hours to form the powder ash air-entrained concrete blocks finished products. The A5.0 level powder ash air-entrained concrete blocks produced by the manufacturing method provided by the invention are small in difficulty.

Description

technical field [0001] The invention relates to a method for manufacturing a fly ash aerated concrete block, in particular to a method for manufacturing an A5.0 grade fly ash aerated concrete block. Background technique [0002] According to the national standard 11968-2006 standard, B06 grade fly ash aerated concrete blocks (density ≤ 625kg / m 3 ) The strength requirement is A3.5 grade, that is, the average strength is above 3.5MPa, and the minimum strength is above 2.8MPa. In the actual building construction process, water heaters, radiators and other related accessories need to be hung on part of the filled wall. The construction party puts forward higher requirements on the strength of the wall filling material. The traditional B06 fly ash aerated concrete block cannot meet the building construction. Therefore, it is of great significance to develop A5.0 high-strength fly ash aerated concrete blocks. [0003] The demand for A5.0-grade fly ash aerated concrete blocks in ...

AI Technical Summary

Problems solved by technology

[0004] The production of A5.0 fly ash aerated concrete blocks needs to solve technical problems: ①The production of high-strength fly ash aerated concrete blocks breaks through the bottleneck of bulk density, and the bulk density of A5.0 fly ash aerated concrete blocks is difficult to control at 625kg / m 3 Below; ②High-strength fly ash air-entrained concrete requires products to have a good pore structure, the quality of fly ash fluctuates greatly, the difference in particle gradation is large, the resting gas generation process is unstable, and through holes are easy to occur, resulting in low strength of the finished product ;③The production of aerated concrete generally uses medium-slow quicklime, but with medium-slow quicklime, the strength of the finished product is difficult to reach 5.0MPa, and it is difficult to control the static gas generation process with fast quicklime. block difficulty