Modified concrete and preparation method thereof

Abstract

The invention provides modified concrete which comprises a concrete base material, a concrete expansive agent, a silane coupling agent grafted modified polystyrene emulsion, an early strength agent, a water reducing agent, weakly acidic water and weakly alkaline water; the concrete base material is prepared from the following raw materials: aluminate cement, fly ash, building waste, lignin fiber and glass fiber; the concrete expansive agent is of a microcapsule type and is composed of a core material and a shell material, the core material is prepared from metal oxide, sodium lignin sulfonate and sodium tripolyphosphate, and the shell material is prepared from calcium alginate; during construction, after the concrete expansive agent is added, the weakly acidic aqueous solution is firstly added and stirred, and then the weakly alkaline aqueous solution is added and stirred. The prepared concrete not only has good anti-cracking and anti-cracking performance, but also has better strength, the compactness and binding property of the concrete are improved, meanwhile, the raw materials adopt the building waste materials, so that the concrete is more energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a modified concrete and a preparation method thereof. Background technique [0002] Concrete is one of the most important civil engineering materials today. It is a kind of artificial stone made of cementitious materials, granular aggregates, water and admixtures and admixtures added when necessary, prepared in a certain proportion, uniformly stirred, compacted, cured and hardened. In the process of cement concrete preparation, a large amount of natural sand and gravel need to be used, but these resources are non-renewable resources. Long-term mining and use of natural sand and gravel will cause the gradual reduction of these non-renewable resources, and even It will affect the ecological environment and cause irreversible damage to the ecology. [0003] In addition, during the pouring and hardening process of concrete, due to chemical shrinkage, cold shrinkage, dry shrinkage ...

AI Technical Summary

Problems solved by technology

In the process of cement concrete preparation, a large amount of natural sand and gravel need to be used, but these resources are non-renewable resources. Long-term mining and use of natural sand and gravel will cause the gradual reduction of these non-renewable resources, and even It will affect the ecological environment and cause irreversible damage to the ecology

[0003] In addition, during the pouring and hardening process of concrete, due to chemical shrinkage, cold shrinkage, dry shrinkage and other reasons, volume shrinkage will occur. The shrinkage value is about 0.04% to 0.06% of its own volume. The phenomena include concrete cracking and damage, and poor impermeability of concrete. Leakage damage, corrosion of steel bars caused by cracking, volume instability, etc.

These shrinkage cracking damages the volume stability of concrete, thereby affecting its structural function, reducing the durability of concrete and shortening its service life.

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