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高强混凝土一般是指强度等级在 C45及以上的混凝土,但目前国内外作为新技术考虑的高强混凝土都是指抗压强度在60兆帕以上的混凝土。高强混凝土一般都具有比较低的水灰比。这种低水灰比的混凝土早在60年代就在我国有过研究和试点,但由于混凝土在低水灰比的情况下,工作性能很差,成型和捣实比较困难,不利于推广。因此,现代高强混凝土的首要技术关键就是要采用高性能的外加剂来改善混凝土拌合物的工作性,尤其混凝土泵送技术的出现,提高了对混凝土工作性的要求,更增加了配
High-strength concrete generally refers to concrete with a strength grade of C45 or higher. However, currently, high-strength concrete as a new technology at home and abroad refers to concrete with a compressive strength of more than 60 MPa. High-strength concrete generally has a relatively low water-cement ratio. This kind of concrete with low water-cement ratio had been researched and piloted in China as early as the 1960s, but due to the poor performance of the concrete in the case of low water-cement ratio, it is difficult to form and compact, which is not conducive to promotion. Therefore, the key technology of modern high-strength concrete is to use high-performance admixtures to improve the workability of concrete mixes, especially the emergence of concrete pumping technology, improve the workability of concrete, and increase the