▎ 摘　　要

NOVELTY - Cement-based composite material containing coal-based carbon nano multi-crystal, comprises 0.01-0.1 pts. wt. coal-based carbon nano multi-crystal, 0.35-0.5 pts. wt. water, 0.005-0.01 pts. wt. water reducing agent, and 1 pts. wt. cement. The coal-based carbon nano multi-crystal is obtained by coal by physical ball milling method. USE - Cement-based composite material containing coal-based carbon nano multi-crystal used in carbon graphene-tube commercial application. ADVANTAGE - The cement-based composite material enhances the strength and toughness of cement-based materials by using coal-based carbon nano polymorphs, improves the flexural strength and compressive strength of cement-based materials at extremely low cost and usage, improves the electrothermal performance of cement-based materials, is non-toxic and harmless, and has good adaptability and compatibility to concrete types and admixture types, and is especially suitable for large-scale commercial applications. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation method of cement-based composite material.