Making method of baking-free waste molding sand bricks

Abstract

The invention discloses a making method of baking-free waste molding sand bricks. The method comprises the following steps: adding water to raw materials comprising 5-20wt% of cement, 10-25wt% of aggregate, 15-25wt% of waste coal slag and 40-70wt% of waste molding sand, and stirring to uniformity; and carrying out vibration compacting of the mixed raw materials, and maintaining to obtain the baking-free bricks. The baking-free bricks use the waste molding sand as a primary raw material, the main component of the waste molding sand is quartz sand with the surface having a binder coating, and the quartz sand has an uneven surface. The uneven surface increases the contact area of the quartz sand with other auxiliary raw materials, so it is in favor of improving the density of the baking-free bricks, thereby the strength of the baking-free bricks is increased.

Description

technical field [0001] The invention belongs to the technical field of brick preparation methods, and in particular relates to a preparation method of waste sand-free bricks. Background technique [0002] Unfired bricks, also known as non-fired bricks, have been widely used in the construction field because they can avoid the serious waste of land resources and the emission of S02 pollution during the preparation process of traditional fired bricks. In the existing technology, unburned bricks use river sand or river sand as the main raw material, and then add a certain amount of auxiliary raw materials such as cement, waste cinder, aggregate, etc. After the cement hardens, it can be used as a bonding material, and waste cinder is used as a filler. , aggregate as reinforcement material. Due to the high price of river sand or river sand, the cost burden of enterprises has been increased, and river sand or river sand is also a material with limited resources. [0003] In the ...

AI Technical Summary

Problems solved by technology

However, it is difficult for the Ca in the quicklime in this method to fully participate in the reaction, so more free calcium oxide will remain in the brick. When these free calcium oxide meets water to form calcium hydroxide, the volume expands, forming a localized formation in the interior of the brick. Expansion stress, which reduces the tensile strength and flexural strength of the brick

[0004] In addition, because the amount of waste coal slag used in this method is too high, the porosity of the unburned brick is increased. Since the waste coal slag has strong water absorption, the unburned brick is filled with too much water, and the volume expands after the water freezes. Increase the water pressure in the bricks, make the bricks prone to freeze-thaw damage, and reduce the frost resistance of the bricks