For winter seamless construction of mass and over-length concrete structure, besides regular structure crack control, freezing winter condition, extremely low natural temperature forms "Inner hot, outer cold" character of mass concrete, the temperature decreasing rate and temperature difference between inside and outside are difficult to control.

The topology of complete manifolds with nonnegative Ricci curvature and large volume growth;

The paper gives a simple version and progress of the open Riemannian manifolds with nonneg-ative Ricci curvature and large volume growth from 1990.

In this paper > we prove that a complete n-dimensional Riemannian manifold with non-negative Ricci curvature, large volume growth and injectivity radius bounded from below is diffeomor-phic to R" provided that for some constant C>0.