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一、绪言近几年来出现了许多新型混凝土外加剂,其多数属于精细化工新产品。从技术革新,多样化,高质量的时代潮流看,笔者以为是必然的。随着建筑施工方法的发展,对混凝土性能的要求正在提高,外加剂的作用更加明显,因此其用途将继续扩大。按长期展望预测,混凝土即使不是全部,也会向建立在未来高度技术基础上的高级制品(例如超高强混凝土、高耐久性混凝土等)方向发展。为此,外加剂已成为极其重要的因素。另一方面,与其担心近年普通混凝土结构物耐久性下降,不如以制定其对策为重要课题,发展提
I. INTRODUCTION Many new concrete admixtures have emerged in recent years, most of which belong to new fine chemical products. From the perspective of technological innovation, diversification, and high quality, the author believes it is inevitable. With the development of building construction methods, the requirements for concrete properties are increasing, and the role of admixtures is even more pronounced, so their use will continue to expand. According to the long-term forecast, concrete, if not all, will develop toward advanced products (such as ultra-high-strength concrete, high-endurable concrete, etc.) built on the basis of future advanced technologies. To this end, admixtures have become extremely important factors. On the other hand, rather than worrying about the decline in the durability of ordinary concrete structures in recent years, it is better to formulate their measures as an important issue.