一、前言 为了解决混凝土冬季施工问题,多年来,都用加热的方法使混凝土本身维持正温以继续硬化,但这增加工程造价,施工也较麻烦。为此我国曾推广过掺外加剂(冷混凝土)的方法,使混凝土能在负温下继续硬 I. INTRODUCTION In order to solve the concrete winter construction problem, for many years, the concrete itself is maintained at a positive temperature by heating to continue hardening, but this increases the construction cost, and the construction is also more troublesome. To this end, China has promoted the method of adding admixture (cold concrete), so that the concrete can continue to be hard at a negative temperature.