我国是生产混凝土膨胀剂的大国,自1992 ～1999 年已应用了30 ×106m3 补偿收缩混凝土,提高了混凝土的防水性能和质量。1992 年制定的JC476 -92 膨胀剂标准,经过数年实践也存在一些问题,与国际先进水平还有一定差距,由建设部、国家建筑材料工业局组织有关单位于1998 年制定了JC476 -1998 标准,并于1999 年1 月1 日起执行 China is a large country producing concrete expansive agent. Since 1992 ~ 1999, 30 × 106m3 of compensatory shrinkage concrete has been applied to improve the waterproofing property and quality of concrete. 1992 developed JC476 -92 expanders standards, after several years of practice, there are some problems, there is a certain gap with the international advanced level, the Ministry of Construction, the State Building Materials Industry Organization organized the relevant units in 1998 developed the JC476 -1998 standard , And implemented on January 1, 1999