Graphite-paraffin composite phase-changing and energy-storing concrete and preparation method thereof

Abstract

The invention relates to a graphite-paraffin composite phase-changing and energy-storing concrete and a preparation method thereof. In the phase-changing and energy-storing concrete, cement, water, sand, gravels and a water reducer are used as substrates, and paraffin phase-changing materials, graphite with enhanced heat conducting function, and fiber reinforced materials with enhanced mechanical strength are also comprised. The preparation method comprise the steps of: firstly, mixing the paraffin and the graphite, heating until the paraffin totally melts, and continuously stirring to uniformly mix the paraffin and the graphite into a viscous form; putting the sand and the gravels into a stirrer, then putting fibers and the cement, carrying out dry mixing, adding the water and the water reducer subsequently, and rapidly stirring to reach a uniform state; and then putting the molten paraffin-graphite viscose mixture into the obtained concrete mixture, and uniformly mixing. Because the graphite is added into the paraffin to be used as an additive, the coefficient of heat conductivity of the phase-changing and energy-storing concrete is greatly enhanced, so that the heat storing and releasing efficiency of an energy-storing material is enhanced.

Description

technical field [0001] The invention belongs to the technical field of phase change energy storage materials, and in particular relates to a graphite-paraffin composite phase change energy storage concrete and a preparation method thereof. Background technique [0002] Most of the existing building materials are constant materials, and their heat capacity is far below the heat capacity required by the ideal energy-saving building envelope, resulting in large indoor temperature fluctuations and low thermal comfort. Combine phase change materials with concrete to make phase change energy storage concrete, use it as exterior wall material, and use the characteristics of energy absorption and energy release of phase change materials in the process of phase change to realize energy utilization and conversion, which is beneficial to The regulation of the indoor temperature of the building can greatly increase the heat storage effect of the enclosure structure, weaken the fluctuati...

AI Technical Summary

Problems solved by technology

However, paraffin phase change materials also have disadvantages. The most important one is the small thermal conductivity, which leads to poor heat transfer performance, low energy conversion rate, and low heat storage utilization rate in system applications, thereby reducing the efficiency of phase change energy storage materials. performance, which greatly hinders its application in the field of building materials