Heat insulating material for flume and its preparation method

Abstract

The invention relates to a heat insulating material used for an aqueduct and a preparation method thereof. The heat insulating material used for the aqueduct is characterized in that the material is made by mixing and stirring dry mixture and water, the mass ratio of the water to the dry mixture is between 1.1:1 and 1.2:1; the dry mixture consists of cement, vitrified hollow beads, sepiolite fiber, siliceous dust, cement-based capillary crystalline material, waste rubber powder, re-dispersible emulsion powder and hydroxypropyl methyl cellulose; and the mass percentage of the raw materials of the dry mixture are: 35 to 54.9 percent of the cement, 35 to 54.9 percent of the vitrified hollow beads, 2 to 8 percent of the sepiolite fiber, 3 to 6 percent of the siliceous dust, 1 to 4 percent of the cement-based capillary crystalline material, 3 to 6 percent of the waste rubber powder, 1 to 5 percent of the re-dispersible emulsion powder and 0.1 to 0.5 percent of the hydroxypropyl methyl cellulose. The heat insulating material has the characteristics of low water absorbing rate, high cohesional strength and compressive strength, good anti-cracking ability and good stability.

Description

technical field [0001] The invention relates to a thermal insulation material for an aqueduct and a preparation method thereof. Background technique [0002] At present, it is generally believed at home and abroad that temperature stress is one of the important factors that cause cracks in concrete structures, especially for thin-walled concrete structures such as large aqueducts, where the internal water flow is large and the external environment changes continuously with the climate. The temperature of the outer wall of the aqueduct increases significantly due to solar radiation, while the inner wall of the aqueduct is in contact with water, and the temperature is lower, forming a large temperature difference between the inside and the outside, causing a large temperature stress on the aqueduct body; in winter, the ambient temperature is relatively low, and the water temperature in the aqueduct is relatively high. The outer wall of the aqueduct is in direct contact with th...

AI Technical Summary

Problems solved by technology

Moreover, the amount of cement used in this type of thermal insulation material is relatively small, but more water is needed to stir the entire thermal insulation material to the construction consistency, so the hydration of the thermal insulation material cement will produce more voids than concrete or ordinary mortar, and because it can be redispersed The air-entraining effect of latex powder and hydroxypropyl methylcellulose ether will cause a large number of tiny pores in the insulation material, as well as large air bubbles introduced during the stirring process, which will further lead to the penetration and water absorption of the entire insulation material.