1975年,我们在研究自应力水泥输油管时,曾试用过MF减水剂。试验证明,可以提高自应力混凝土的早期强度和自应力值、提高输油管的内压力。为了节约自应力水泥、缩短自应力管的蒸养时间,达到节能和提高管子质量的目的,从1981年8月起,我们又开展了“减水剂应用于硅酸盐自应力管的试验”。现就试验取得的初步效果介绍于下。一、试验内容试验分试验室物、化试验和管子试验两部分。 1.试验室试验其目的是选择减水剂的品种、最佳掺量和合理的掺加方法;确定自应力混凝土的减水率;了解掺有减水剂的自应力混凝土的 In 1975, we tried MF water-reducing agents when we were studying self-stressing cement pipelines. Tests have shown that the early strength and self-stress values ​​of self-stressing concrete can be increased and the internal pressure of the oil pipeline can be increased. In order to save self-stressing cement and shorten the steam curing time of the self-stress pipe to achieve energy saving and improve the quality of the pipe, we started the “Test of water reducing agent applied to the silicate self-stress pipe” from August 1981. . The preliminary results obtained in the trial are presented below. First, the test content of the test sub-laboratory, chemical test and pipe test two parts. 1. The purpose of the laboratory test is to choose the type of water reducer, the best mixing amount and a reasonable mixing method; to determine the water reduction rate of the self-stressing concrete; to understand the self-stressing concrete with superplasticizer