Environment-friendly anti-freezing type concrete and preparation method thereof

Abstract

The invention discloses environment-friendly anti-freezing type concrete and a preparation method thereof. The environment-friendly anti-freezing type concrete is prepared from, by weight, 240-260 parts of cement, 180-200 parts of water, 850-870 parts of gravel, 770-790 parts of medium sand, 60-80 parts of mineral powder, 50-70 parts of coal ash, 4.36-10.36 parts of an additive, 1.25-3.25 parts ofan anti-freezing agent, 30-45 parts of waste concerts particles, 15-25 parts of waste rubber particles, 1.5-3.5 parts of water-based acrylic ester, 10-15 parts of epoxy resin and 8.6-10.6 parts of polyurethane particles; the anti-freezing agent is composed of polyethylene glycol, water, polydextrose, gelatin agar and guar gum. The environment-friendly anti-freezing type concrete has the advantages that the excellent anti-freezing performance is achieved, waste materials can be effectively utilized, contaminating gas in environment can be absorbed, and air is purified.

Description

technical field [0001] The invention relates to the technical field of building materials, more specifically, it relates to an environment-friendly frost-resistant concrete and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, environmental problems are becoming more and more severe, and the output of various wastes has increased sharply. Recycling wastes is an important way to protect natural resources and promote sustainable development. The acceleration of urban construction in our country has led to a rapid increase in the output of waste concrete. At present, the annual waste concrete produced in my country has reached about 100 million tons, and the long-term accumulated waste concrete will reach billions of tons. In 2015, the amount of waste tires produced in my country reached 330 million, and the recycling rate was less than 50%. Both waste concrete and waste tires can be recycled as concrete materials, ...

AI Technical Summary

Problems solved by technology

The temperature continues to drop, and when the water in the concrete completely turns into ice, that is, when it completely changes from a liquid phase to a solid phase, the hydration of the cement basically stops, resulting in no increase in the strength of the concrete; (2) due to the water becoming After ice, the volume increases by about 9%, and an expansion stress of about 2.5 MPa is generated at the same time. If this stress is greater than the internal strength of the concrete when it is initially set, the concrete will be damaged to varying degrees, that is, early freezing damage; (3) when After the water turns into ice, ice edges with larger particles will be produced on the surface of aggregates and steel bars, which will weaken the bonding force between cement slurry and aggregates and steel bars, and reduce the strength of concrete; (4) when the temperature rises and the ice edges melt , will also form various voids inside the concrete, resulting in a reduction in the durability of the concrete

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