1.水泥的软、硬练标号的相应性根据水泥新标准,软练标号分为225、275、325、425、525、625六个标号,相应的硬练标号为300、350、400、500、600、700。1975年和1976年,建材研究院对全国水泥的软、硬练标号进行了两次实测验证。1979年,我们在研究过程中也取得了9个水泥厂47批水泥试样的软、硬练实测强度。现把建材院和我们测得的几种水泥的软、硬练强度关系和比值列于表1。 1. Correspondingness of soft and hard-practical markings of cement According to the new cement standard, soft-practice markings are divided into six 225, 275, 325, 425, 525, 625 and corresponding hard-working markings are 300, 350, 400, 500. , 600, 700. In 1975 and 1976, the Institute of Building Materials carried out two actual test verifications of the national cement’s soft and hard-practice labels. In 1979, we also obtained soft and hard measured strengths of 47 batches of cement samples from 9 cement plants during the research process. The relationship between the soft and hard strength and the ratio of several building cements and our measured cement are listed in Table 1.