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本文是葛洲坝工程大坝混凝土部分性能试验资料的总结.对混凝土的抗压强度、抗拉强度和混凝土极限拉伸等性能,随龄期发展的规律进行了分析.其规律性较好,可供大坝混凝土设计、施工时参考。纯大坝水泥混凝土,早期抗压强度发展快,7天约为28天强度的80%,90天和一年的强度分别为28天的115%及130%;而矿渣大坝水泥混凝土7天约为28天强度的50%,90天和一年龄期的强度分别为28天的130%及160%.混凝土抗拉强度,纯大坝水泥混凝土以28天的抗拉强度为1.0,则7天为0.8,90天和一年的强度发展系数分别为1.1及1.2;而矿渣大坝水泥混凝土,7天强度系数为0.6,90天和一年的强度发展系数则分别为1.3及1.6.混凝土极限拉伸值,因28天的混凝土极限拉伸值一般接近最大值,90天以后的极限拉伸值增加甚少。
This paper is a summary of the experimental data of the performance test of the concrete of Gezhouba Dam.According to the compressive strength, tensile strength and concrete ultimate tensile properties of concrete, the law of development with age is analyzed.The law is good, Dam concrete design, construction reference. Pure dam cement concrete, rapid development of early compressive strength, 7 days is about 80% of the strength of 28 days, 90 days and a year of strength were 28 days 115% and 130%; and slag dam concrete for 7 days About 50% of the intensity of 28 days, 90 days and one year of age were 130% and 160% of the 28 days respectively.The tensile strength of concrete, pure dam concrete strength to 28 days of the tensile strength of 1.0, then 7 The day 0.8 and day 90 and the strength development coefficient for one year are 1.1 and 1.2, respectively, whereas for the slag dam concrete, the 7-day strength coefficient is 0.6 and 90 days and the strength development coefficient for one year is 1.3 and 1.6, respectively Ultimate stretch value, due to 28 days of concrete ultimate tensile value is generally close to the maximum 90 days after the ultimate tensile value increases little.