A kind of modified concrete and preparation method thereof

Abstract

The invention proposes a modified concrete, which includes concrete base material, concrete expansion agent, silane coupling agent graft-modified polystyrene emulsion, early strength agent, water reducing agent, weakly acidic water and weakly alkaline water; The concrete base material includes the following preparation raw materials: aluminate cement, fly ash, construction waste, lignin fiber, glass fiber; the concrete expansion agent is a microcapsule type, composed of a core material and a shell material, the core material The raw materials for the preparation of the material include metal oxides, sodium lignosulfonate and sodium tripolyphosphate, and the raw materials for the preparation of the shell material include calcium alginate; during construction, after adding the concrete expansion agent, first add a weakly acidic aqueous solution to stir, and then add The weakly alkaline aqueous solution is stirred. The concrete prepared by the invention not only has good anti-cracking and anti-cracking performance, but also has good strength, and improves the compactness and bonding of the concrete.

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 of our time. It is an artificial stone made of cementitious materials, granular aggregates, water, and admixtures and admixtures added when necessary in a certain proportion, uniformly stirred, compacted, cured and hardened. In the process of preparing cement concrete, 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 these non-renewable resources to gradually decrease, even It will affect the ecological environment and cause irreversible damage to the ecology. [0003] In addition, in the process of pouring and hardening of concrete, due to chemical shrinkage, cold shrinkage, dry shrinkage and other reasons, v...

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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