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一、前言混凝土外加剂的研究及应用在我国已有30年,但开发应用比较迅速的是近十年的事。应用普通减水剂、高效减水剂和复合减水剂,大大改善了混凝土性能,加快了施工进度,促进了混凝土工艺的发展,使制作高强混凝土(C60～C80)及流动性混凝土成为可能,并在节约水泥、节约能源、提高工程质量等方面取得了显著效果。但不少单位对各种外加剂的性能及应用技术还缺乏了解,再加某些厂家宣传不
I. INTRODUCTION The research and application of concrete admixtures have been in China for 30 years, but it has been relatively rapid in development and application for nearly ten years. The application of ordinary water-reducing agent, superplasticizer and composite water-reducing agent has greatly improved the performance of concrete, accelerated the construction progress, promoted the development of concrete technology, and made it possible to produce high-strength concrete (C60-C80) and fluid concrete. And it has achieved remarkable results in saving cement, saving energy, and improving project quality. However, many units still lack understanding of the performance and application technology of various additives, and some manufacturers do not publicize it.