由国家建委发布、北京市建材局提出、北京市建材科研所起草的蒸压灰砂砖部颁标准(JC153—73)从一九七三年十一月一日起开始试行。原灰砂砖部颁标准(JC153—68)是在一九六八年发布的。经过五年的试行表明,原标准基本上符合我国的实际情况。但是,其中也存在一些问题,主要是:(1)制订原标准时的验证工作,大 The piloting standard for autoclaved lime sand bricks (JC153-73) issued by the National Construction Committee, proposed by the Beijing Municipal Building Material Bureau, and drafted by the Beijing Building Materials Research Institute began trial operation on November 1st, 1973. The original lime sand brick ministerial standards (JC153-68) were issued in 1968. After five years of trial implementation, the original standard basically conforms to the actual situation in China. However, there are also some problems, which are mainly: (1) Verification work when the original standard was established,