A modified calcium oxide and preparation method based cement concrete expansion

The present invention provides a modified calcium-based cement concrete expansion oxide, calcium oxide specific surface area of ​​the modified cement-concrete expansion of 100-600 m2 / kg; expanded biodegradable polymer and a calcium-based oxide cooked feed composition. Calcium oxide modified cement-concrete expansion provided by the invention reduces the hydration of calcium oxide is not valid in the plastic phase of concrete, increases the amount of expansion after curing, may further extend the shelf life of the product; may be used to crack impermeable concrete structure , and significantly improve the durability of concrete.