1制定标准的目的混凝土膨胀剂是一种建筑结构功能材料,其品质直接关系到建筑结构的安全,目前国际上只有日本和中国能够工业化生产混凝土膨胀剂,日本有专门的国家标准(JIS A 6202),我国现行的混凝土膨胀剂行业标准是JC 476-2001,随着我国基础建设的快速发展,2005年混凝土膨胀剂年使用量已经接近100万吨,配制混凝土约2800万m3/年,应用数量巨大,每年还以10%～30%的速度递增,我国已经成为世界上混凝土膨胀剂最大的产销国,因此不对其产品质量进行强制限制,将会严重危及众多基础设施的结构安全,给国家造成无法估量的 The purpose of setting standards Concrete expansive agent is a kind of functional material of building structure, its quality is directly related to the safety of building structure. At present, only Japan and China can produce concrete expanders industrially, and Japan has a special national standard (JIS A 6202 ), China’s current industry standard for concrete expanders is JC 476-2001. With the rapid development of infrastructure construction in China, the annual usage of concrete expanders in 2005 has reached nearly 1 million tons, and the amount of concrete used for construction is 28 million m3 / year. The number of applications Huge, increasing by 10% ~ 30% every year. China has become the largest producer and exporter of concrete expanders in the world. Therefore, without imposing restrictions on the quality of its products, it will seriously endanger the structural safety of many infrastructures and cause to the country Immeasurable